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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@169 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Mark Spencer
2000-01-05 08:20:27 +00:00
parent 41567d7c5e
commit 6f0ba39ae5
36 changed files with 8680 additions and 0 deletions
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70
codecs/lpc10/Makefile Executable file
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#
# Makefile for LPC-10 speech coder library (unix)
#
# default C compiler
CC= gcc
#
# These definitions for CFLAGS and LIB_TARGET_DIR are used when one
# runs make in the lpc10 directory, without environment variables that
# override them. When make is run in this directory from a makefile
# for an application that uses the LPC10 coder, there are environment
# variables set for CFLAGS and LIB_TARGET_DIR that override these
# definitions.
#
LIB_TARGET_DIR = .
#
# -I$(LIB_TARGET_DIR) option needed so that #include "machine.h"
# directives can find the machine.h file.
#
WARNINGS = -Wall -Wno-comment -Wno-error
CFLAGS = -O3 -I$(LIB_TARGET_DIR) $(WARNINGS)
LIB = $(LIB_TARGET_DIR)/liblpc10.a
.PHONY: all clean
all: $(LIB)
ranlib $(LIB)
$(LIB): $(LIB)(f2clib.o) \
$(LIB)(analys.o) \
$(LIB)(bsynz.o) \
$(LIB)(chanwr.o) \
$(LIB)(dcbias.o) \
$(LIB)(decode.o) \
$(LIB)(deemp.o) \
$(LIB)(difmag.o) \
$(LIB)(dyptrk.o) \
$(LIB)(encode.o) \
$(LIB)(energy.o) \
$(LIB)(ham84.o) \
$(LIB)(hp100.o) \
$(LIB)(invert.o) \
$(LIB)(irc2pc.o) \
$(LIB)(ivfilt.o) \
$(LIB)(lpcdec.o) \
$(LIB)(lpcenc.o) \
$(LIB)(lpcini.o) \
$(LIB)(lpfilt.o) \
$(LIB)(median.o) \
$(LIB)(mload.o) \
$(LIB)(onset.o) \
$(LIB)(pitsyn.o) \
$(LIB)(placea.o) \
$(LIB)(placev.o) \
$(LIB)(preemp.o) \
$(LIB)(prepro.o) \
$(LIB)(random.o) \
$(LIB)(rcchk.o) \
$(LIB)(synths.o) \
$(LIB)(tbdm.o) \
$(LIB)(voicin.o) \
$(LIB)(vparms.o)
clean:
-rm -f *.o $(LIB)

617
codecs/lpc10/analys.c Executable file
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/*
$Log$
Revision 1.1 2000/01/05 08:20:39 markster
Version 0.1.2 from FTP
Revision 1.2 2000/01/05 08:20:39 markster
Some OSS fixes and a few lpc changes to make it actually work
* Revision 1.2 1996/08/20 20:16:01 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_encoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_encoder_state().
*
* Revision 1.1 1996/08/19 22:29:08 jaf
* Initial revision
*
*/
#ifdef P_R_O_T_O_T_Y_P_E_S
extern int analys_(real *speech, integer *voice, integer *pitch, real *rms, real *rc, struct lpc10_encoder_state *st);
/* comlen contrl_ 12 */
/*:ref: preemp_ 14 5 6 6 4 6 6 */
/*:ref: onset_ 14 7 6 4 4 4 4 4 4 */
/*:ref: placev_ 14 11 4 4 4 4 4 4 4 4 4 4 4 */
/*:ref: lpfilt_ 14 4 6 6 4 4 */
/*:ref: ivfilt_ 14 5 6 6 4 4 6 */
/*:ref: tbdm_ 14 8 6 4 4 4 6 4 4 4 */
/*:ref: voicin_ 14 12 4 6 6 4 4 6 6 4 6 4 4 4 */
/*:ref: dyptrk_ 14 6 6 4 4 4 4 4 */
/*:ref: placea_ 14 9 4 4 4 4 4 4 4 4 4 */
/*:ref: dcbias_ 14 3 4 6 6 */
/*:ref: energy_ 14 3 4 6 6 */
/*:ref: mload_ 14 6 4 4 4 6 6 6 */
/*:ref: invert_ 14 4 4 6 6 6 */
/*:ref: rcchk_ 14 3 4 6 6 */
/*:ref: initonset_ 14 0 */
/*:ref: initvoicin_ 14 0 */
/*:ref: initdyptrk_ 14 0 */
/* Rerunning f2c -P may change prototypes or declarations. */
#endif
/* -- translated by f2c (version 19951025).
You must link the resulting object file with the libraries:
-lf2c -lm (in that order)
*/
#include "f2c.h"
/* Common Block Declarations */
extern struct {
integer order, lframe;
logical corrp;
} contrl_;
#define contrl_1 contrl_
/* Table of constant values */
static integer c__10 = 10;
static integer c__181 = 181;
static integer c__720 = 720;
static integer c__3 = 3;
static integer c__90 = 90;
static integer c__156 = 156;
static integer c__307 = 307;
static integer c__462 = 462;
static integer c__312 = 312;
static integer c__60 = 60;
static integer c__1 = 1;
/* ****************************************************************** */
/* ANALYS Version 55 */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.2 1996/08/20 20:16:01 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_encoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_encoder_state().
*
* Revision 1.1 1996/08/19 22:29:08 jaf
* Initial revision
* */
/* Revision 1.9 1996/05/23 19:41:07 jaf */
/* Commented out some unnecessary lines that were reading uninitialized */
/* values. */
/* Revision 1.8 1996/03/27 23:57:55 jaf */
/* Added some comments about which indices of the local buffers INBUF, */
/* LPBUF, etc., get read or modified by some of the subroutine calls. I */
/* just did this while trying to figure out the discrepancy between the */
/* embedded code compiled with all local variables implicitly saved, and */
/* without. */
/* I added some debugging write statements in hopes of finding a problem. */
/* None of them ever printed anything while running with the long input */
/* speech file dam9.spd provided in the distribution. */
/* Revision 1.7 1996/03/27 18:06:20 jaf */
/* Commented out access to MAXOSP, which is just a debugging variable */
/* that was defined in the COMMON block CONTRL in contrl.fh. */
/* Revision 1.6 1996/03/26 19:31:33 jaf */
/* Commented out trace statements. */
/* Revision 1.5 1996/03/21 15:19:35 jaf */
/* Added comments for ENTRY PITDEC. */
/* Revision 1.4 1996/03/19 20:54:27 jaf */
/* Added a line to INITANALYS. See comments there. */
/* Revision 1.3 1996/03/19 20:52:49 jaf */
/* Rearranged the order of the local variables quite a bit, to separate */
/* them into groups of "constants", "locals that don't need to be saved */
/* from one call to the next", and "local that do need to be saved from */
/* one call to the next". */
/* Several locals in the last set should have been given initial values, */
/* but weren't. I gave them all initial values of 0. */
/* Added a separate ENTRY INITANALYS that initializes all local state */
/* that should be, and also calls the corresponding entries of the */
/* subroutines called by ANALYS that also have local state. */
/* There used to be DATA statements in ANALYS. I got rid of most of */
/* them, and added a local logical variable FIRST that calls the entry */
/* INITANALYS on the first call to ANALYS. This is just so that one need */
/* not remember to call INITANALYS first in order for the state to be */
/* initialized. */
/* Revision 1.2 1996/03/11 23:29:32 jaf */
/* Added several comments with my own personal questions about the */
/* Fortran 77 meaning of the parameters passed to the subroutine PREEMP. */
/* Revision 1.1 1996/02/07 14:42:29 jaf */
/* Initial revision */
/* ****************************************************************** */
/* SUBROUTINE ANALYS */
/* Input: */
/* SPEECH */
/* Indices 1 through LFRAME read. */
/* Output: */
/* VOICE */
/* Indices 1 through 2 written. */
/* PITCH */
/* Written in subroutine DYPTRK, and then perhaps read and written */
/* some more. */
/* RMS */
/* Written. */
/* RC */
/* Indices 1 through ORDER written (ORDER defined in contrl.fh). */
/* This subroutine maintains local state from one call to the next. If */
/* you want to switch to using a new audio stream for this filter, or */
/* reinitialize its state for any other reason, call the ENTRY */
/* INITANALYS. */
/* ENTRY PITDEC */
/* Input: */
/* PITCH - Encoded pitch index */
/* Output: */
/* PTAU - Decoded pitch period */
/* This entry has no local state. It accesses a "constant" array */
/* declared in ANALYS. */
/* Subroutine */ int analys_(real *speech, integer *voice, integer
*pitch, real *rms, real *rc, struct lpc10_encoder_state *st)
{
/* Initialized data */
static integer tau[60] = { 20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,
35,36,37,38,39,40,42,44,46,48,50,52,54,56,58,60,62,64,66,68,70,72,
74,76,78,80,84,88,92,96,100,104,108,112,116,120,124,128,132,136,
140,144,148,152,156 };
static integer buflim[4] = { 181,720,25,720 };
static real precoef = .9375f;
/* System generated locals */
integer i__1;
/* Local variables */
real amdf[60];
integer half;
real abuf[156];
real *bias;
extern /* Subroutine */ int tbdm_(real *, integer *, integer *, integer *,
real *, integer *, integer *, integer *);
integer *awin;
integer midx, ewin[6] /* was [2][3] */;
real ivrc[2], temp;
real *zpre;
integer *vwin;
integer i__, j, lanal;
extern /* Subroutine */ int rcchk_(integer *, real *, real *), mload_(
integer *, integer *, integer *, real *, real *, real *);
real *inbuf, *pebuf;
real *lpbuf, *ivbuf;
real *rcbuf;
integer *osbuf;
extern /* Subroutine */ int onset_(real *, integer *, integer *, integer *
, integer *, integer *, integer *, struct lpc10_encoder_state *);
integer *osptr;
extern /* Subroutine */ placea_(integer *, integer *
, integer *, integer *, integer *, integer *, integer *, integer *
, integer *), dcbias_(integer *, real *, real *), placev_(integer
*, integer *, integer *, integer *, integer *, integer *, integer
*, integer *, integer *, integer *, integer *);
integer ipitch;
integer *obound;
extern /* Subroutine */ int preemp_(real *, real *, integer *, real *,
real *), voicin_(integer *, real *, real *, integer *, integer *,
real *, real *, integer *, real *, integer *, integer *, integer *,
struct lpc10_encoder_state *);
integer *voibuf;
integer mintau;
real *rmsbuf;
extern /* Subroutine */ int lpfilt_(real *, real *, integer *, integer *),
ivfilt_(real *, real *, integer *, integer *, real *), energy_(
integer *, real *, real *), invert_(integer *, real *, real *,
real *);
integer minptr, maxptr;
extern /* Subroutine */ int dyptrk_(real *, integer *, integer *, integer
*, integer *, integer *, struct lpc10_encoder_state *);
real phi[100] /* was [10][10] */, psi[10];
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.2 1996/08/20 20:16:01 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_encoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_encoder_state().
*
* Revision 1.1 1996/08/19 22:29:08 jaf
* Initial revision
* */
/* Revision 1.3 1996/03/29 22:03:47 jaf */
/* Removed definitions for any constants that were no longer used. */
/* Revision 1.2 1996/03/26 19:34:33 jaf */
/* Added comments indicating which constants are not needed in an */
/* application that uses the LPC-10 coder. */
/* Revision 1.1 1996/02/07 14:43:51 jaf */
/* Initial revision */
/* LPC Configuration parameters: */
/* Frame size, Prediction order, Pitch period */
/* Arguments to ANALYS */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.2 1996/08/20 20:16:01 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_encoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_encoder_state().
*
* Revision 1.1 1996/08/19 22:29:08 jaf
* Initial revision
* */
/* Revision 1.3 1996/03/29 22:05:55 jaf */
/* Commented out the common block variables that are not needed by the */
/* embedded version. */
/* Revision 1.2 1996/03/26 19:34:50 jaf */
/* Added comments indicating which constants are not needed in an */
/* application that uses the LPC-10 coder. */
/* Revision 1.1 1996/02/07 14:44:09 jaf */
/* Initial revision */
/* LPC Processing control variables: */
/* *** Read-only: initialized in setup */
/* Files for Speech, Parameter, and Bitstream Input & Output, */
/* and message and debug outputs. */
/* Here are the only files which use these variables: */
/* lpcsim.f setup.f trans.f error.f vqsetup.f */
/* Many files which use fdebug are not listed, since it is only used in */
/* those other files conditionally, to print trace statements. */
/* integer fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
/* LPC order, Frame size, Quantization rate, Bits per frame, */
/* Error correction */
/* Subroutine SETUP is the only place where order is assigned a value, */
/* and that value is 10. It could increase efficiency 1% or so to */
/* declare order as a constant (i.e., a Fortran PARAMETER) instead of as
*/
/* a variable in a COMMON block, since it is used in many places in the */
/* core of the coding and decoding routines. Actually, I take that back.
*/
/* At least when compiling with f2c, the upper bound of DO loops is */
/* stored in a local variable before the DO loop begins, and then that is
*/
/* compared against on each iteration. */
/* Similarly for lframe, which is given a value of MAXFRM in SETUP. */
/* Similarly for quant, which is given a value of 2400 in SETUP. quant */
/* is used in only a few places, and never in the core coding and */
/* decoding routines, so it could be eliminated entirely. */
/* nbits is similar to quant, and is given a value of 54 in SETUP. */
/* corrp is given a value of .TRUE. in SETUP, and is only used in the */
/* subroutines ENCODE and DECODE. It doesn't affect the speed of the */
/* coder significantly whether it is .TRUE. or .FALSE., or whether it is
*/
/* a constant or a variable, since it is only examined once per frame. */
/* Leaving it as a variable that is set to .TRUE. seems like a good */
/* idea, since it does enable some error-correction capability for */
/* unvoiced frames, with no change in the coding rate, and no noticeable
*/
/* quality difference in the decoded speech. */
/* integer quant, nbits */
/* *** Read/write: variables for debugging, not needed for LPC algorithm
*/
/* Current frame, Unstable frames, Output clip count, Max onset buffer,
*/
/* Debug listing detail level, Line count on listing page */
/* nframe is not needed for an embedded LPC10 at all. */
/* nunsfm is initialized to 0 in SETUP, and incremented in subroutine */
/* ERROR, which is only called from RCCHK. When LPC10 is embedded into */
/* an application, I would recommend removing the call to ERROR in RCCHK,
*/
/* and remove ERROR and nunsfm completely. */
/* iclip is initialized to 0 in SETUP, and incremented in entry SWRITE in
*/
/* sread.f. When LPC10 is embedded into an application, one might want */
/* to cause it to be incremented in a routine that takes the output of */
/* SYNTHS and sends it to an audio device. It could be optionally */
/* displayed, for those that might want to know what it is. */
/* maxosp is never initialized to 0 in SETUP, although it probably should
*/
/* be, and it is updated in subroutine ANALYS. I doubt that its value */
/* would be of much interest to an application in which LPC10 is */
/* embedded. */
/* listl and lincnt are not needed for an embedded LPC10 at all. */
/* integer nframe, nunsfm, iclip, maxosp, listl, lincnt */
/* common /contrl/ fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
/* common /contrl/ quant, nbits */
/* common /contrl/ nframe, nunsfm, iclip, maxosp, listl, lincnt */
/* Arguments to entry PITDEC (below) */
/* Parameters/constants */
/* Constants */
/* NF = Number of frames */
/* AF = Frame in which analysis is done */
/* OSLEN = Length of the onset buffer */
/* LTAU = Number of pitch lags */
/* SBUFL, SBUFH = Start and end index of speech buffers */
/* LBUFL, LBUFH = Start and end index of LPF speech buffer */
/* MINWIN, MAXWIN = Min and Max length of voicing (and analysis) windows
*/
/* PWLEN, PWINH, PWINL = Length, upper and lower limits of pitch window
*/
/* DVWINL, DVWINH = Default lower and upper limits of voicing window */
/* The tables TAU and BUFLIM, and the variable PRECOEF, are not */
/* Fortran PARAMETER's, but they are initialized with DATA */
/* statements, and never modified. Thus, they need not have SAVE */
/* statements for them to keep their values from one invocation to
*/
/* the next. */
/* Local variables that need not be saved */
/* Local state */
/* Data Buffers */
/* INBUF Raw speech (with DC bias removed each frame) */
/* PEBUF Preemphasized speech */
/* LPBUF Low pass speech buffer */
/* IVBUF Inverse filtered speech */
/* OSBUF Indexes of onsets in speech buffers */
/* VWIN Voicing window indices */
/* AWIN Analysis window indices */
/* EWIN Energy window indices */
/* VOIBUF Voicing decisions on windows in VWIN */
/* RMSBUF RMS energy */
/* RCBUF Reflection Coefficients */
/* Pitch is handled separately from the above parameters. */
/* The following variables deal with pitch: */
/* MIDX Encoded initial pitch estimate for analysis frame */
/* IPITCH Initial pitch computed for frame AF (decoded from MIDX) */
/* PITCH The encoded pitch value (index into TAU) for the present */
/* frame (delayed and smoothed by Dyptrack) */
/* Parameter adjustments */
if (speech) {
--speech;
}
if (voice) {
--voice;
}
if (rc) {
--rc;
}
/* Function Body */
/* Calculations are done on future frame due to requirements */
/* of the pitch tracker. Delay RMS and RC's 2 frames to give */
/* current frame parameters on return. */
/* Update all buffers */
inbuf = &(st->inbuf[0]);
pebuf = &(st->pebuf[0]);
lpbuf = &(st->lpbuf[0]);
ivbuf = &(st->ivbuf[0]);
bias = &(st->bias);
osbuf = &(st->osbuf[0]);
osptr = &(st->osptr);
obound = &(st->obound[0]);
vwin = &(st->vwin[0]);
awin = &(st->awin[0]);
voibuf = &(st->voibuf[0]);
rmsbuf = &(st->rmsbuf[0]);
rcbuf = &(st->rcbuf[0]);
zpre = &(st->zpre);
i__1 = 720 - contrl_1.lframe;
for (i__ = 181; i__ <= i__1; ++i__) {
inbuf[i__ - 181] = inbuf[contrl_1.lframe + i__ - 181];
pebuf[i__ - 181] = pebuf[contrl_1.lframe + i__ - 181];
}
i__1 = 540 - contrl_1.lframe;
for (i__ = 229; i__ <= i__1; ++i__) {
ivbuf[i__ - 229] = ivbuf[contrl_1.lframe + i__ - 229];
}
i__1 = 720 - contrl_1.lframe;
for (i__ = 25; i__ <= i__1; ++i__) {
lpbuf[i__ - 25] = lpbuf[contrl_1.lframe + i__ - 25];
}
j = 1;
i__1 = (*osptr) - 1;
for (i__ = 1; i__ <= i__1; ++i__) {
if (osbuf[i__ - 1] > contrl_1.lframe) {
osbuf[j - 1] = osbuf[i__ - 1] - contrl_1.lframe;
++j;
}
}
*osptr = j;
voibuf[0] = voibuf[2];
voibuf[1] = voibuf[3];
for (i__ = 1; i__ <= 2; ++i__) {
vwin[(i__ << 1) - 2] = vwin[(i__ + 1 << 1) - 2] - contrl_1.lframe;
vwin[(i__ << 1) - 1] = vwin[(i__ + 1 << 1) - 1] - contrl_1.lframe;
awin[(i__ << 1) - 2] = awin[(i__ + 1 << 1) - 2] - contrl_1.lframe;
awin[(i__ << 1) - 1] = awin[(i__ + 1 << 1) - 1] - contrl_1.lframe;
/* EWIN(*,J) is unused for J .NE. AF, so the following shift is
*/
/* unnecessary. It also causes error messages when the C versio
n */
/* of the code created from this by f2c is run with Purify. It
*/
/* correctly complains that uninitialized memory is being read.
*/
/* EWIN(1,I) = EWIN(1,I+1) - LFRAME */
/* EWIN(2,I) = EWIN(2,I+1) - LFRAME */
obound[i__ - 1] = obound[i__];
voibuf[i__ * 2] = voibuf[(i__ + 1) * 2];
voibuf[(i__ << 1) + 1] = voibuf[(i__ + 1 << 1) + 1];
rmsbuf[i__ - 1] = rmsbuf[i__];
i__1 = contrl_1.order;
for (j = 1; j <= i__1; ++j) {
rcbuf[j + i__ * 10 - 11] = rcbuf[j + (i__ + 1) * 10 - 11];
}
}
/* Copy input speech, scale to sign+12 bit integers */
/* Remove long term DC bias. */
/* If the average value in the frame was over 1/4096 (after current
*/
/* BIAS correction), then subtract that much more from samples in */
/* next frame. If the average value in the frame was under */
/* -1/4096, add 1/4096 more to samples in next frame. In all other
*/
/* cases, keep BIAS the same. */
temp = 0.f;
i__1 = contrl_1.lframe;
for (i__ = 1; i__ <= i__1; ++i__) {
inbuf[720 - contrl_1.lframe + i__ - 181] = speech[i__] * 4096.f -
(*bias);
temp += inbuf[720 - contrl_1.lframe + i__ - 181];
}
if (temp > (real) contrl_1.lframe) {
*bias += 1;
}
if (temp < (real) (-contrl_1.lframe)) {
*bias += -1;
}
/* Place Voicing Window */
i__ = 721 - contrl_1.lframe;
preemp_(&inbuf[i__ - 181], &pebuf[i__ - 181], &contrl_1.lframe, &precoef,
zpre);
onset_(pebuf, osbuf, osptr, &c__10, &c__181, &c__720, &contrl_1.lframe, st);
/* MAXOSP is just a debugging variable. */
/* MAXOSP = MAX( MAXOSP, OSPTR ) */
placev_(osbuf, osptr, &c__10, &obound[2], vwin, &c__3, &contrl_1.lframe,
&c__90, &c__156, &c__307, &c__462);
/* The Pitch Extraction algorithm estimates the pitch for a frame
*/
/* of speech by locating the minimum of the average magnitude difference
*/
/* function (AMDF). The AMDF operates on low-pass, inverse filtered */
/* speech. (The low-pass filter is an 800 Hz, 19 tap, equiripple, FIR
*/
/* filter and the inverse filter is a 2nd-order LPC filter.) The pitch
*/
/* estimate is later refined by dynamic programming (DYPTRK). However,
*/
/* since some of DYPTRK's parameters are a function of the voicing */
/* decisions, a voicing decision must precede the final pitch estimation.
*/
/* See subroutines LPFILT, IVFILT, and TBDM. */
/* LPFILT reads indices LBUFH-LFRAME-29 = 511 through LBUFH = 720 */
/* of INBUF, and writes indices LBUFH+1-LFRAME = 541 through LBUFH
*/
/* = 720 of LPBUF. */
lpfilt_(&inbuf[228], &lpbuf[384], &c__312, &contrl_1.lframe);
/* IVFILT reads indices (PWINH-LFRAME-7) = 353 through PWINH = 540
*/
/* of LPBUF, and writes indices (PWINH-LFRAME+1) = 361 through */
/* PWINH = 540 of IVBUF. */
ivfilt_(&lpbuf[204], ivbuf, &c__312, &contrl_1.lframe, ivrc);
/* TBDM reads indices PWINL = 229 through */
/* (PWINL-1)+MAXWIN+(TAU(LTAU)-TAU(1))/2 = 452 of IVBUF, and writes
*/
/* indices 1 through LTAU = 60 of AMDF. */
tbdm_(ivbuf, &c__156, tau, &c__60, amdf, &minptr, &maxptr, &mintau);
/* Voicing decisions are made for each half frame of input speech.
*/
/* An initial voicing classification is made for each half of the */
/* analysis frame, and the voicing decisions for the present frame */
/* are finalized. See subroutine VOICIN. */
/* The voicing detector (VOICIN) classifies the input signal as */
/* unvoiced (including silence) or voiced using the AMDF windowed */
/* maximum-to-minimum ratio, the zero crossing rate, energy measures, */
/* reflection coefficients, and prediction gains. */
/* The pitch and voicing rules apply smoothing and isolated */
/* corrections to the pitch and voicing estimates and, in the process,
*/
/* introduce two frames of delay into the corrected pitch estimates and
*/
/* voicing decisions. */
for (half = 1; half <= 2; ++half) {
voicin_(&vwin[4], inbuf, lpbuf, buflim, &half, &amdf[minptr - 1], &
amdf[maxptr - 1], &mintau, ivrc, obound, voibuf, &c__3, st);
}
/* Find the minimum cost pitch decision over several frames */
/* given the current voicing decision and the AMDF array */
dyptrk_(amdf, &c__60, &minptr, &voibuf[7], pitch, &midx, st);
ipitch = tau[midx - 1];
/* Place spectrum analysis and energy windows */
placea_(&ipitch, voibuf, &obound[2], &c__3, vwin, awin, ewin, &
contrl_1.lframe, &c__156);
/* Remove short term DC bias over the analysis window, Put result in ABUF
*/
lanal = awin[5] + 1 - awin[4];
dcbias_(&lanal, &pebuf[awin[4] - 181], abuf);
/* ABUF(1:LANAL) is now defined. It is equal to */
/* PEBUF(AWIN(1,AF):AWIN(2,AF)) corrected for short term DC bias. */
/* Compute RMS over integer number of pitch periods within the */
/* analysis window. */
/* Note that in a hardware implementation this computation may be */
/* simplified by using diagonal elements of PHI computed by MLOAD. */
i__1 = ewin[5] - ewin[4] + 1;
energy_(&i__1, &abuf[ewin[4] - awin[4]], &rmsbuf[2]);
/* Matrix load and invert, check RC's for stability */
mload_(&contrl_1.order, &c__1, &lanal, abuf, phi, psi);
invert_(&contrl_1.order, phi, psi, &rcbuf[20]);
rcchk_(&contrl_1.order, &rcbuf[10], &rcbuf[20]);
/* Set return parameters */
voice[1] = voibuf[2];
voice[2] = voibuf[3];
*rms = rmsbuf[0];
i__1 = contrl_1.order;
for (i__ = 1; i__ <= i__1; ++i__) {
rc[i__] = rcbuf[i__ - 1];
}
return 0;
} /* analys_ */

423
codecs/lpc10/bsynz.c Executable file
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@@ -0,0 +1,423 @@
/*
$Log$
Revision 1.1 2000/01/05 08:20:39 markster
Version 0.1.2 from FTP
Revision 1.2 2000/01/05 08:20:39 markster
Some OSS fixes and a few lpc changes to make it actually work
* Revision 1.2 1996/08/20 20:18:55 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_decoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_decoder_state().
*
* Revision 1.1 1996/08/19 22:32:58 jaf
* Initial revision
*
*/
#ifdef P_R_O_T_O_T_Y_P_E_S
extern int bsynz_(real *coef, integer *ip, integer *iv, real *sout, real *rms, real *ratio, real *g2pass, struct lpc10_decoder_state *st);
/* comlen contrl_ 12 */
/*:ref: random_ 4 0 */
#endif
/* -- translated by f2c (version 19951025).
You must link the resulting object file with the libraries:
-lf2c -lm (in that order)
*/
#include "f2c.h"
/* Common Block Declarations */
extern struct {
integer order, lframe;
logical corrp;
} contrl_;
#define contrl_1 contrl_
/* ***************************************************************** */
/* BSYNZ Version 54 */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.2 1996/08/20 20:18:55 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_decoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_decoder_state().
*
* Revision 1.1 1996/08/19 22:32:58 jaf
* Initial revision
* */
/* Revision 1.4 1996/03/27 18:11:22 jaf */
/* Changed the range of NOISE printed out in the debugging statements, */
/* even though they are commented out. I didn't discover this until I */
/* tried comparing two different versions of the LPC-10 coder, each with */
/* full tracing enabled. */
/* Revision 1.3 1996/03/26 19:33:23 jaf */
/* Commented out trace statements. */
/* Revision 1.2 1996/03/20 17:12:54 jaf */
/* Added comments about which indices of array arguments are read or */
/* written. */
/* Rearranged local variable declarations to indicate which need to be */
/* saved from one invocation to the next. Added entry INITBSYNZ to */
/* reinitialize the local state variables, if desired. */
/* Revision 1.1 1996/02/07 14:43:15 jaf */
/* Initial revision */
/* ***************************************************************** */
/* Synthesize One Pitch Epoch */
/* Input: */
/* COEF - Predictor coefficients */
/* Indices 1 through ORDER read. */
/* IP - Pitch period (number of samples to synthesize) */
/* IV - Voicing for the current epoch */
/* RMS - Energy for the current epoch */
/* RATIO - Energy slope for plosives */
/* G2PASS- Sharpening factor for 2 pass synthesis */
/* Output: */
/* SOUT - Synthesized speech */
/* Indices 1 through IP written. */
/* This subroutine maintains local state from one call to the next. If */
/* you want to switch to using a new audio stream for this filter, or */
/* reinitialize its state for any other reason, call the ENTRY */
/* INITBSYNZ. */
/* Subroutine */ int bsynz_(real *coef, integer *ip, integer *iv,
real *sout, real *rms, real *ratio, real *g2pass,
struct lpc10_decoder_state *st)
{
/* Initialized data */
integer *ipo;
real *rmso;
static integer kexc[25] = { 8,-16,26,-48,86,-162,294,-502,718,-728,184,
672,-610,-672,184,728,718,502,294,162,86,48,26,16,8 };
real *exc;
real *exc2;
real *lpi1;
real *lpi2;
real *lpi3;
real *hpi1;
real *hpi2;
real *hpi3;
/* System generated locals */
integer i__1, i__2;
real r__1, r__2;
/* Builtin functions */
double sqrt(doublereal);
/* Local variables */
real gain, xssq;
integer i__, j, k;
real noise[166], pulse;
integer px;
real sscale;
extern integer random_(struct lpc10_decoder_state *);
real xy, sum, ssq;
real lpi0, hpi0;
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.2 1996/08/20 20:18:55 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_decoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_decoder_state().
*
* Revision 1.1 1996/08/19 22:32:58 jaf
* Initial revision
* */
/* Revision 1.3 1996/03/29 22:03:47 jaf */
/* Removed definitions for any constants that were no longer used. */
/* Revision 1.2 1996/03/26 19:34:33 jaf */
/* Added comments indicating which constants are not needed in an */
/* application that uses the LPC-10 coder. */
/* Revision 1.1 1996/02/07 14:43:51 jaf */
/* Initial revision */
/* LPC Configuration parameters: */
/* Frame size, Prediction order, Pitch period */
/* Arguments */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.2 1996/08/20 20:18:55 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_decoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_decoder_state().
*
* Revision 1.1 1996/08/19 22:32:58 jaf
* Initial revision
* */
/* Revision 1.3 1996/03/29 22:05:55 jaf */
/* Commented out the common block variables that are not needed by the */
/* embedded version. */
/* Revision 1.2 1996/03/26 19:34:50 jaf */
/* Added comments indicating which constants are not needed in an */
/* application that uses the LPC-10 coder. */
/* Revision 1.1 1996/02/07 14:44:09 jaf */
/* Initial revision */
/* LPC Processing control variables: */
/* *** Read-only: initialized in setup */
/* Files for Speech, Parameter, and Bitstream Input & Output, */
/* and message and debug outputs. */
/* Here are the only files which use these variables: */
/* lpcsim.f setup.f trans.f error.f vqsetup.f */
/* Many files which use fdebug are not listed, since it is only used in */
/* those other files conditionally, to print trace statements. */
/* integer fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
/* LPC order, Frame size, Quantization rate, Bits per frame, */
/* Error correction */
/* Subroutine SETUP is the only place where order is assigned a value, */
/* and that value is 10. It could increase efficiency 1% or so to */
/* declare order as a constant (i.e., a Fortran PARAMETER) instead of as
*/
/* a variable in a COMMON block, since it is used in many places in the */
/* core of the coding and decoding routines. Actually, I take that back.
*/
/* At least when compiling with f2c, the upper bound of DO loops is */
/* stored in a local variable before the DO loop begins, and then that is
*/
/* compared against on each iteration. */
/* Similarly for lframe, which is given a value of MAXFRM in SETUP. */
/* Similarly for quant, which is given a value of 2400 in SETUP. quant */
/* is used in only a few places, and never in the core coding and */
/* decoding routines, so it could be eliminated entirely. */
/* nbits is similar to quant, and is given a value of 54 in SETUP. */
/* corrp is given a value of .TRUE. in SETUP, and is only used in the */
/* subroutines ENCODE and DECODE. It doesn't affect the speed of the */
/* coder significantly whether it is .TRUE. or .FALSE., or whether it is
*/
/* a constant or a variable, since it is only examined once per frame. */
/* Leaving it as a variable that is set to .TRUE. seems like a good */
/* idea, since it does enable some error-correction capability for */
/* unvoiced frames, with no change in the coding rate, and no noticeable
*/
/* quality difference in the decoded speech. */
/* integer quant, nbits */
/* *** Read/write: variables for debugging, not needed for LPC algorithm
*/
/* Current frame, Unstable frames, Output clip count, Max onset buffer,
*/
/* Debug listing detail level, Line count on listing page */
/* nframe is not needed for an embedded LPC10 at all. */
/* nunsfm is initialized to 0 in SETUP, and incremented in subroutine */
/* ERROR, which is only called from RCCHK. When LPC10 is embedded into */
/* an application, I would recommend removing the call to ERROR in RCCHK,
*/
/* and remove ERROR and nunsfm completely. */
/* iclip is initialized to 0 in SETUP, and incremented in entry SWRITE in
*/
/* sread.f. When LPC10 is embedded into an application, one might want */
/* to cause it to be incremented in a routine that takes the output of */
/* SYNTHS and sends it to an audio device. It could be optionally */
/* displayed, for those that might want to know what it is. */
/* maxosp is never initialized to 0 in SETUP, although it probably should
*/
/* be, and it is updated in subroutine ANALYS. I doubt that its value */
/* would be of much interest to an application in which LPC10 is */
/* embedded. */
/* listl and lincnt are not needed for an embedded LPC10 at all. */
/* integer nframe, nunsfm, iclip, maxosp, listl, lincnt */
/* common /contrl/ fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
/* common /contrl/ quant, nbits */
/* common /contrl/ nframe, nunsfm, iclip, maxosp, listl, lincnt */
/* Function return value definitions */
/* Parameters/constants */
/* KEXC is not a Fortran PARAMETER, but it is an array initialized
*/
/* with a DATA statement that is never modified. */
/* Local variables that need not be saved */
/* NOISE is declared with range (1:MAXPIT+MAXORD), but only indices
*/
/* ORDER+1 through ORDER+IP are ever used, and I think that IP */
/* .LE. MAXPIT. Why not declare it to be in the range (1:MAXPIT) */
/* and use that range? */
/* Local state */
/* I believe that only indices 1 through ORDER of EXC need to be */
/* saved from one invocation to the next, but we may as well save */
/* the whole array. */
/* None of these local variables were given initial values in the */
/* original code. I'm guessing that 0 is a reasonable initial */
/* value for all of them. */
/* Parameter adjustments */
if (coef) {
--coef;
}
if (sout) {
--sout;
}
/* Function Body */
ipo = &(st->ipo);
exc = &(st->exc[0]);
exc2 = &(st->exc2[0]);
lpi1 = &(st->lpi1);
lpi2 = &(st->lpi2);
lpi3 = &(st->lpi3);
hpi1 = &(st->hpi1);
hpi2 = &(st->hpi2);
hpi3 = &(st->hpi3);
rmso = &(st->rmso_bsynz);
/* MAXPIT+MAXORD=166 */
/* Calculate history scale factor XY and scale filter state */
/* Computing MIN */
r__1 = *rmso / (*rms + 1e-6f);
xy = min(r__1,8.f);
*rmso = *rms;
i__1 = contrl_1.order;
for (i__ = 1; i__ <= i__1; ++i__) {
exc2[i__ - 1] = exc2[*ipo + i__ - 1] * xy;
}
*ipo = *ip;
if (*iv == 0) {
/* Generate white noise for unvoiced */
i__1 = *ip;
for (i__ = 1; i__ <= i__1; ++i__) {
exc[contrl_1.order + i__ - 1] = (real) (random_(st) / 64);
}
/* Impulse doublet excitation for plosives */
/* (RANDOM()+32768) is in the range 0 to 2**16-1. Therefore the
*/
/* following expression should be evaluated using integers with
at */
/* least 32 bits (16 isn't enough), and PX should be in the rang
e */
/* ORDER+1+0 through ORDER+1+(IP-2) .EQ. ORDER+IP-1. */
px = (random_(st) + 32768) * (*ip - 1) / 65536 + contrl_1.order + 1;
r__1 = *ratio / 4 * 1.f;
pulse = r__1 * 342;
if (pulse > 2e3f) {
pulse = 2e3f;
}
exc[px - 1] += pulse;
exc[px] -= pulse;
/* Load voiced excitation */
} else {
sscale = sqrt((real) (*ip)) / 6.928f;
i__1 = *ip;
for (i__ = 1; i__ <= i__1; ++i__) {
exc[contrl_1.order + i__ - 1] = 0.f;
if (i__ <= 25) {
exc[contrl_1.order + i__ - 1] = sscale * kexc[i__ - 1];
}
lpi0 = exc[contrl_1.order + i__ - 1];
r__2 = exc[contrl_1.order + i__ - 1] * .125f + *lpi1 * .75f;
r__1 = r__2 + *lpi2 * .125f;
exc[contrl_1.order + i__ - 1] = r__1 + *lpi3 * 0.f;
*lpi3 = *lpi2;
*lpi2 = *lpi1;
*lpi1 = lpi0;
}
i__1 = *ip;
for (i__ = 1; i__ <= i__1; ++i__) {
noise[contrl_1.order + i__ - 1] = random_(st) * 1.f / 64;
hpi0 = noise[contrl_1.order + i__ - 1];
r__2 = noise[contrl_1.order + i__ - 1] * -.125f + *hpi1 * .25f;
r__1 = r__2 + *hpi2 * -.125f;
noise[contrl_1.order + i__ - 1] = r__1 + *hpi3 * 0.f;
*hpi3 = *hpi2;
*hpi2 = *hpi1;
*hpi1 = hpi0;
}
i__1 = *ip;
for (i__ = 1; i__ <= i__1; ++i__) {
exc[contrl_1.order + i__ - 1] += noise[contrl_1.order + i__ - 1];
}
}
/* Synthesis filters: */
/* Modify the excitation with all-zero filter 1 + G*SUM */
xssq = 0.f;
i__1 = *ip;
for (i__ = 1; i__ <= i__1; ++i__) {
k = contrl_1.order + i__;
sum = 0.f;
i__2 = contrl_1.order;
for (j = 1; j <= i__2; ++j) {
sum += coef[j] * exc[k - j - 1];
}
sum *= *g2pass;
exc2[k - 1] = sum + exc[k - 1];
}
/* Synthesize using the all pole filter 1 / (1 - SUM) */
i__1 = *ip;
for (i__ = 1; i__ <= i__1; ++i__) {
k = contrl_1.order + i__;
sum = 0.f;
i__2 = contrl_1.order;
for (j = 1; j <= i__2; ++j) {
sum += coef[j] * exc2[k - j - 1];
}
exc2[k - 1] = sum + exc2[k - 1];
xssq += exc2[k - 1] * exc2[k - 1];
}
/* Save filter history for next epoch */
i__1 = contrl_1.order;
for (i__ = 1; i__ <= i__1; ++i__) {
exc[i__ - 1] = exc[*ip + i__ - 1];
exc2[i__ - 1] = exc2[*ip + i__ - 1];
}
/* Apply gain to match RMS */
r__1 = *rms * *rms;
ssq = r__1 * *ip;
gain = sqrt(ssq / xssq);
i__1 = *ip;
for (i__ = 1; i__ <= i__1; ++i__) {
sout[i__] = gain * exc2[contrl_1.order + i__ - 1];
}
return 0;
} /* bsynz_ */

225
codecs/lpc10/chanwr.c Executable file
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@@ -0,0 +1,225 @@
/*
$Log$
Revision 1.1 2000/01/05 08:20:39 markster
Version 0.1.2 from FTP
Revision 1.2 2000/01/05 08:20:39 markster
Some OSS fixes and a few lpc changes to make it actually work
* Revision 1.2 1996/08/20 20:20:24 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_encoder_state that is passed as an
* argument.
*
* Revision 1.1 1996/08/19 22:40:31 jaf
* Initial revision
*
*/
#ifdef P_R_O_T_O_T_Y_P_E_S
extern int chanwr_(integer *order, integer *ipitv, integer *irms, integer *irc, integer *ibits, struct lpc10_encoder_state *st);
extern int chanrd_(integer *order, integer *ipitv, integer *irms, integer *irc, integer *ibits);
#endif
/* -- translated by f2c (version 19951025).
You must link the resulting object file with the libraries:
-lf2c -lm (in that order)
*/
#include "f2c.h"
/* *********************************************************************** */
/* CHANL Version 49 */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.2 1996/08/20 20:20:24 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_encoder_state that is passed as an
* argument.
*
* Revision 1.1 1996/08/19 22:40:31 jaf
* Initial revision
* */
/* Revision 1.3 1996/03/21 15:14:57 jaf */
/* Added comments about which indices of argument arrays are read or */
/* written, and about the one bit of local state in CHANWR. CHANRD */
/* has no local state. */
/* Revision 1.2 1996/03/13 18:55:10 jaf */
/* Comments added explaining which of the local variables of this */
/* subroutine need to be saved from one invocation to the next, and which */
/* do not. */
/* Revision 1.1 1996/02/07 14:43:31 jaf */
/* Initial revision */
/* *********************************************************************** */
/* CHANWR: */
/* Place quantized parameters into bitstream */
/* Input: */
/* ORDER - Number of reflection coefficients (not really variable) */
/* IPITV - Quantized pitch/voicing parameter */
/* IRMS - Quantized energy parameter */
/* IRC - Quantized reflection coefficients */
/* Indices 1 through ORDER read. */
/* Output: */
/* IBITS - Serial bitstream */
/* Indices 1 through 54 written. */
/* Bit 54, the SYNC bit, alternates from one call to the next. */
/* Subroutine CHANWR maintains one bit of local state from one call to */
/* the next, in the variable ISYNC. I believe that this one bit is only */
/* intended to allow a receiver to resynchronize its interpretation of */
/* the bit stream, by looking for which of the 54 bits alternates every */
/* frame time. This is just a simple framing mechanism that is not */
/* useful when other, higher overhead framing mechanisms are used to */
/* transmit the coded frames. */
/* I'm not going to make an entry to reinitialize this bit, since it */
/* doesn't help a receiver much to know whether the first sync bit is a 0 */
/* or a 1. It needs to examine several frames in sequence to have */
/* reasonably good assurance that its framing is correct. */
/* CHANRD: */
/* Reconstruct parameters from bitstream */
/* Input: */
/* ORDER - Number of reflection coefficients (not really variable) */
/* IBITS - Serial bitstream */
/* Indices 1 through 53 read (SYNC bit is ignored). */
/* Output: */
/* IPITV - Quantized pitch/voicing parameter */
/* IRMS - Quantized energy parameter */
/* IRC - Quantized reflection coefficients */
/* Indices 1 through ORDER written */
/* Entry CHANRD has no local state. */
/* IBITS is 54 bits of LPC data ordered as follows: */
/* R1-0, R2-0, R3-0, P-0, A-0, */
/* R1-1, R2-1, R3-1, P-1, A-1, */
/* R1-2, R4-0, R3-2, A-2, P-2, R4-1, */
/* R1-3, R2-2, R3-3, R4-2, A-3, */
/* R1-4, R2-3, R3-4, R4-3, A-4, */
/* P-3, R2-4, R7-0, R8-0, P-4, R4-4, */
/* R5-0, R6-0, R7-1,R10-0, R8-1, */
/* R5-1, R6-1, R7-2, R9-0, P-5, */
/* R5-2, R6-2,R10-1, R8-2, P-6, R9-1, */
/* R5-3, R6-3, R7-3, R9-2, R8-3, SYNC */
/* Subroutine */ int chanwr_0_(int n__, integer *order, integer *ipitv,
integer *irms, integer *irc, integer *ibits,
struct lpc10_encoder_state *st)
{
/* Initialized data */
integer *isync;
static integer bit[10] = { 2,4,8,8,8,8,16,16,16,16 };
static integer iblist[53] = { 13,12,11,1,2,13,12,11,1,2,13,10,11,2,1,10,
13,12,11,10,2,13,12,11,10,2,1,12,7,6,1,10,9,8,7,4,6,9,8,7,5,1,9,8,
4,6,1,5,9,8,7,5,6 };
/* System generated locals */
integer i__1;
/* Local variables */
integer itab[13], i__;
/* Arguments */
/* Parameters/constants */
/* These arrays are not Fortran PARAMETER's, but they are defined */
/* by DATA statements below, and their contents are never altered.
*/
/* Local variables that need not be saved */
/* Local state */
/* ISYNC is only used by CHANWR, not by ENTRY CHANRD. */
/* Parameter adjustments */
--irc;
--ibits;
/* Function Body */
switch(n__) {
case 1: goto L_chanrd;
}
isync = &(st->isync);
/* ***********************************************************************
*/
/* Place quantized parameters into bitstream */
/* ***********************************************************************
*/
/* Place parameters into ITAB */
itab[0] = *ipitv;
itab[1] = *irms;
itab[2] = 0;
i__1 = *order;
for (i__ = 1; i__ <= i__1; ++i__) {
itab[i__ + 2] = irc[*order + 1 - i__] & 32767;
}
/* Put 54 bits into IBITS array */
for (i__ = 1; i__ <= 53; ++i__) {
ibits[i__] = itab[iblist[i__ - 1] - 1] & 1;
itab[iblist[i__ - 1] - 1] /= 2;
}
ibits[54] = *isync & 1;
*isync = 1 - *isync;
return 0;
/* ***********************************************************************
*/
/* Reconstruct parameters from bitstream */
/* ***********************************************************************
*/
L_chanrd:
/* Reconstruct ITAB */
for (i__ = 1; i__ <= 13; ++i__) {
itab[i__ - 1] = 0;
}
for (i__ = 1; i__ <= 53; ++i__) {
itab[iblist[54 - i__ - 1] - 1] = (itab[iblist[54 - i__ - 1] - 1] << 1)
+ ibits[54 - i__];
}
/* Sign extend RC's */
i__1 = *order;
for (i__ = 1; i__ <= i__1; ++i__) {
if ((itab[i__ + 2] & bit[i__ - 1]) != 0) {
itab[i__ + 2] -= bit[i__ - 1] << 1;
}
}
/* Restore variables */
*ipitv = itab[0];
*irms = itab[1];
i__1 = *order;
for (i__ = 1; i__ <= i__1; ++i__) {
irc[i__] = itab[*order + 4 - i__ - 1];
}
return 0;
} /* chanwr_ */
/* Subroutine */ int chanwr_(integer *order, integer *ipitv, integer *irms,
integer *irc, integer *ibits, struct lpc10_encoder_state *st)
{
return chanwr_0_(0, order, ipitv, irms, irc, ibits, st);
}
/* Subroutine */ int chanrd_(integer *order, integer *ipitv, integer *irms,
integer *irc, integer *ibits)
{
return chanwr_0_(1, order, ipitv, irms, irc, ibits, 0);
}

95
codecs/lpc10/dcbias.c Executable file
View File

@@ -0,0 +1,95 @@
/*
$Log$
Revision 1.1 2000/01/05 08:20:39 markster
Version 0.1.2 from FTP
Revision 1.2 2000/01/05 08:20:39 markster
Some OSS fixes and a few lpc changes to make it actually work
* Revision 1.1 1996/08/19 22:40:23 jaf
* Initial revision
*
*/
#ifdef P_R_O_T_O_T_Y_P_E_S
extern int dcbias_(integer *len, real *speech, real *sigout);
#endif
/* -- translated by f2c (version 19951025).
You must link the resulting object file with the libraries:
-lf2c -lm (in that order)
*/
#include "f2c.h"
/* ********************************************************************* */
/* DCBIAS Version 50 */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.1 1996/08/19 22:40:23 jaf
* Initial revision
* */
/* Revision 1.3 1996/03/18 21:19:22 jaf */
/* Just added a few comments about which array indices of the arguments */
/* are used, and mentioning that this subroutine has no local state. */
/* Revision 1.2 1996/03/13 16:44:53 jaf */
/* Comments added explaining that none of the local variables of this */
/* subroutine need to be saved from one invocation to the next. */
/* Revision 1.1 1996/02/07 14:44:21 jaf */
/* Initial revision */
/* ********************************************************************* */
/* Calculate and remove DC bias from buffer. */
/* Input: */
/* LEN - Length of speech buffers */
/* SPEECH - Input speech buffer */
/* Indices 1 through LEN read. */
/* Output: */
/* SIGOUT - Output speech buffer */
/* Indices 1 through LEN written */
/* This subroutine has no local state. */
/* Subroutine */ int dcbias_(integer *len, real *speech, real *sigout)
{
/* System generated locals */
integer i__1;
/* Local variables */
real bias;
integer i__;
/* Arguments */
/* Local variables that need not be saved */
/* Parameter adjustments */
--sigout;
--speech;
/* Function Body */
bias = 0.f;
i__1 = *len;
for (i__ = 1; i__ <= i__1; ++i__) {
bias += speech[i__];
}
bias /= *len;
i__1 = *len;
for (i__ = 1; i__ <= i__1; ++i__) {
sigout[i__] = speech[i__] - bias;
}
return 0;
} /* dcbias_ */

589
codecs/lpc10/decode.c Executable file
View File

@@ -0,0 +1,589 @@
/*
$Log$
Revision 1.1 2000/01/05 08:20:39 markster
Version 0.1.2 from FTP
Revision 1.2 2000/01/05 08:20:39 markster
Some OSS fixes and a few lpc changes to make it actually work
* Revision 1.2 1996/08/20 20:22:39 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_decoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_decoder_state().
*
* Revision 1.1 1996/08/19 22:32:38 jaf
* Initial revision
*
*/
#ifdef P_R_O_T_O_T_Y_P_E_S
extern int decode_(integer *ipitv, integer *irms, integer *irc, integer *voice, integer *pitch, real *rms, real *rc, struct lpc10_decoder_state *st);
/* comlen contrl_ 12 */
/*:ref: ham84_ 14 3 4 4 4 */
/*:ref: median_ 4 3 4 4 4 */
#endif
/* -- translated by f2c (version 19951025).
You must link the resulting object file with the libraries:
-lf2c -lm (in that order)
*/
#include "f2c.h"
/* Common Block Declarations */
extern struct {
integer order, lframe;
logical corrp;
} contrl_;
#define contrl_1 contrl_
/* Table of constant values */
static integer c__2 = 2;
/* ***************************************************************** */
/* DECODE Version 54 */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.2 1996/08/20 20:22:39 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_decoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_decoder_state().
*
* Revision 1.1 1996/08/19 22:32:38 jaf
* Initial revision
* */
/* Revision 1.5 1996/05/23 20:06:03 jaf */
/* Assigned PITCH a "default" value on the first call, since otherwise it */
/* would be left uninitialized. */
/* Revision 1.4 1996/03/26 19:35:18 jaf */
/* Commented out trace statements. */
/* Revision 1.3 1996/03/21 21:10:50 jaf */
/* Added entry INITDECODE to reinitialize the local state of subroutine */
/* DECODE. */
/* Revision 1.2 1996/03/21 21:04:50 jaf */
/* Determined which local variables should be saved from one invocation */
/* to the next, and guessed initial values for some that should have been */
/* saved, but weren't given initial values. Many of the arrays are */
/* "constants", and many local variables are only used if the "global" */
/* variable CORRP is .TRUE. */
/* Added comments explaining which indices of array arguments are read or */
/* written. */
/* Revision 1.1 1996/02/12 03:21:10 jaf */
/* Initial revision */
/* ***************************************************************** */
/* This subroutine provides error correction and decoding */
/* for all LPC parameters */
/* Input: */
/* IPITV - Index value of pitch */
/* IRMS - Coded Energy */
/* CORRP - Error correction: */
/* If FALSE, parameters are decoded directly with no delay. If TRUE, */
/* most important parameter bits are protected by Hamming code and */
/* median smoothed. This requires an additional frame of delay. */
/* Input/Output: */
/* IRC - Coded Reflection Coefficients */
/* Indices 1 through ORDER always read, then written. */
/* Output: */
/* VOICE - Half frame voicing decisions */
/* Indices 1 through 2 written. */
/* PITCH - Decoded pitch */
/* RMS - Energy */
/* RC - Reflection coefficients */
/* Indices 1 through ORDER written. */
/* NOTE: Zero RC's should be done more directly, but this would affect */
/* coded parameter printout. */
/* This subroutine maintains local state from one call to the next. If */
/* you want to switch to using a new audio stream for this filter, or */
/* reinitialize its state for any other reason, call the ENTRY */
/* INITDECODE. */
/* Subroutine */ int decode_(integer *ipitv, integer *irms,
integer *irc, integer *voice, integer *pitch, real *rms, real *rc,
struct lpc10_decoder_state *st)
{
/* Initialized data */
logical *first;
static integer ethrs = 2048;
static integer ethrs1 = 128;
static integer ethrs2 = 1024;
static integer ethrs3 = 2048;
static integer ivtab[32] = { 24960,24960,24960,24960,25480,25480,25483,
25480,16640,1560,1560,1560,16640,1816,1563,1560,24960,24960,24859,
24856,26001,25881,25915,25913,1560,1560,7800,3640,1561,1561,3643,
3641 };
static real corth[32] /* was [4][8] */ = { 32767.f,10.f,5.f,0.f,
32767.f,8.f,4.f,0.f,32.f,6.4f,3.2f,0.f,32.f,6.4f,3.2f,0.f,32.f,
11.2f,6.4f,0.f,32.f,11.2f,6.4f,0.f,16.f,5.6f,3.2f,0.f,16.f,5.6f,
3.2f,0.f };
static integer detau[128] = { 0,0,0,3,0,3,3,31,0,3,3,21,3,3,29,30,0,3,3,
20,3,25,27,26,3,23,58,22,3,24,28,3,0,3,3,3,3,39,33,32,3,37,35,36,
3,38,34,3,3,42,46,44,50,40,48,3,54,3,56,3,52,3,3,1,0,3,3,108,3,78,
100,104,3,84,92,88,156,80,96,3,3,74,70,72,66,76,68,3,62,3,60,3,64,
3,3,1,3,116,132,112,148,152,3,3,140,3,136,3,144,3,3,1,124,120,128,
3,3,3,3,1,3,3,3,1,3,1,1,1 };
static integer rmst[64] = { 1024,936,856,784,718,656,600,550,502,460,420,
384,352,328,294,270,246,226,206,188,172,158,144,132,120,110,102,
92,84,78,70,64,60,54,50,46,42,38,34,32,30,26,24,22,20,18,17,16,15,
14,13,12,11,10,9,8,7,6,5,4,3,2,1,0 };
static integer detab7[32] = { 4,11,18,25,32,39,46,53,60,66,72,77,82,87,92,
96,101,104,108,111,114,115,117,119,121,122,123,124,125,126,127,
127 };
static real descl[8] = { .6953f,.625f,.5781f,.5469f,.5312f,.5391f,.4688f,
.3828f };
integer *ivp2h;
static integer deadd[8] = { 1152,-2816,-1536,-3584,-1280,-2432,768,-1920 }
;
static integer qb[8] = { 511,511,1023,1023,1023,1023,2047,4095 };
static integer nbit[10] = { 8,8,5,5,4,4,4,4,3,2 };
static integer zrc[10] = { 0,0,0,0,0,3,0,2,0,0 };
static integer bit[5] = { 2,4,8,16,32 };
integer *iovoic;
integer *iavgp;
integer *iptold;
integer *erate;
integer *drc;
integer *dpit;
integer *drms;
/* System generated locals */
integer i__1, i__2;
/* Builtin functions */
integer pow_ii(integer *, integer *);
/* Local variables */
extern /* Subroutine */ int ham84_(integer *, integer *, integer *);
integer ipit, iout, i__, icorf, index, ivoic, ixcor, i1, i2, i4;
extern integer median_(integer *, integer *, integer *);
integer ishift, errcnt, lsb;
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.2 1996/08/20 20:22:39 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_decoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_decoder_state().
*
* Revision 1.1 1996/08/19 22:32:38 jaf
* Initial revision
* */
/* Revision 1.3 1996/03/29 22:03:47 jaf */
/* Removed definitions for any constants that were no longer used. */
/* Revision 1.2 1996/03/26 19:34:33 jaf */
/* Added comments indicating which constants are not needed in an */
/* application that uses the LPC-10 coder. */
/* Revision 1.1 1996/02/07 14:43:51 jaf */
/* Initial revision */
/* LPC Configuration parameters: */
/* Frame size, Prediction order, Pitch period */
/* Arguments */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.2 1996/08/20 20:22:39 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_decoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_decoder_state().
*
* Revision 1.1 1996/08/19 22:32:38 jaf
* Initial revision
* */
/* Revision 1.3 1996/03/29 22:05:55 jaf */
/* Commented out the common block variables that are not needed by the */
/* embedded version. */
/* Revision 1.2 1996/03/26 19:34:50 jaf */
/* Added comments indicating which constants are not needed in an */
/* application that uses the LPC-10 coder. */
/* Revision 1.1 1996/02/07 14:44:09 jaf */
/* Initial revision */
/* LPC Processing control variables: */
/* *** Read-only: initialized in setup */
/* Files for Speech, Parameter, and Bitstream Input & Output, */
/* and message and debug outputs. */
/* Here are the only files which use these variables: */
/* lpcsim.f setup.f trans.f error.f vqsetup.f */
/* Many files which use fdebug are not listed, since it is only used in */
/* those other files conditionally, to print trace statements. */
/* integer fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
/* LPC order, Frame size, Quantization rate, Bits per frame, */
/* Error correction */
/* Subroutine SETUP is the only place where order is assigned a value, */
/* and that value is 10. It could increase efficiency 1% or so to */
/* declare order as a constant (i.e., a Fortran PARAMETER) instead of as
*/
/* a variable in a COMMON block, since it is used in many places in the */
/* core of the coding and decoding routines. Actually, I take that back.
*/
/* At least when compiling with f2c, the upper bound of DO loops is */
/* stored in a local variable before the DO loop begins, and then that is
*/
/* compared against on each iteration. */
/* Similarly for lframe, which is given a value of MAXFRM in SETUP. */
/* Similarly for quant, which is given a value of 2400 in SETUP. quant */
/* is used in only a few places, and never in the core coding and */
/* decoding routines, so it could be eliminated entirely. */
/* nbits is similar to quant, and is given a value of 54 in SETUP. */
/* corrp is given a value of .TRUE. in SETUP, and is only used in the */
/* subroutines ENCODE and DECODE. It doesn't affect the speed of the */
/* coder significantly whether it is .TRUE. or .FALSE., or whether it is
*/
/* a constant or a variable, since it is only examined once per frame. */
/* Leaving it as a variable that is set to .TRUE. seems like a good */
/* idea, since it does enable some error-correction capability for */
/* unvoiced frames, with no change in the coding rate, and no noticeable
*/
/* quality difference in the decoded speech. */
/* integer quant, nbits */
/* *** Read/write: variables for debugging, not needed for LPC algorithm
*/
/* Current frame, Unstable frames, Output clip count, Max onset buffer,
*/
/* Debug listing detail level, Line count on listing page */
/* nframe is not needed for an embedded LPC10 at all. */
/* nunsfm is initialized to 0 in SETUP, and incremented in subroutine */
/* ERROR, which is only called from RCCHK. When LPC10 is embedded into */
/* an application, I would recommend removing the call to ERROR in RCCHK,
*/
/* and remove ERROR and nunsfm completely. */
/* iclip is initialized to 0 in SETUP, and incremented in entry SWRITE in
*/
/* sread.f. When LPC10 is embedded into an application, one might want */
/* to cause it to be incremented in a routine that takes the output of */
/* SYNTHS and sends it to an audio device. It could be optionally */
/* displayed, for those that might want to know what it is. */
/* maxosp is never initialized to 0 in SETUP, although it probably should
*/
/* be, and it is updated in subroutine ANALYS. I doubt that its value */
/* would be of much interest to an application in which LPC10 is */
/* embedded. */
/* listl and lincnt are not needed for an embedded LPC10 at all. */
/* integer nframe, nunsfm, iclip, maxosp, listl, lincnt */
/* common /contrl/ fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
/* common /contrl/ quant, nbits */
/* common /contrl/ nframe, nunsfm, iclip, maxosp, listl, lincnt */
/* Function return value definitions */
/* Parameters/constants */
/* The variables below that are not Fortran PARAMETER's are */
/* initialized with DATA statements, and then never modified. */
/* The following are used regardless of CORRP's value. */
/* DETAU, NBIT, QB, DEADD, DETAB7, RMST, DESCL */
/* The following are used only if CORRP is .TRUE. */
/* ETHRS, ETHRS1, ETHRS2, ETHRS3, IVTAB, BIT, CORTH, ZRC */
/* Local variables that need not be saved */
/* The following are used regardless of CORRP's value */
/* The following are used only if CORRP is .TRUE. */
/* Local state */
/* The following are used regardless of CORRP's value */
/* The following are used only if CORRP is .TRUE. */
/* I am guessing the initial values for IVP2H, IOVOIC, DRC, DPIT, */
/* and DRMS. They should be checked to see if they are reasonable.
*/
/* I'm also guessing for ERATE, but I think 0 is the right initial
*/
/* value. */
/* Parameter adjustments */
if (irc) {
--irc;
}
if (voice) {
--voice;
}
if (rc) {
--rc;
}
/* Function Body */
iptold = &(st->iptold);
first = &(st->first);
ivp2h = &(st->ivp2h);
iovoic = &(st->iovoic);
iavgp = &(st->iavgp);
erate = &(st->erate);
drc = &(st->drc[0]);
dpit = &(st->dpit[0]);
drms = &(st->drms[0]);
/* DATA statements for "constants" defined above. */
/* IF (LISTL.GE.3) WRITE(FDEBUG,800) IPITV,IRMS,(IRC(J),J=1,ORDER) */
/* 800 FORMAT(1X,' <<ERRCOR IN>>',T32,6X,I6,I5,T50,10I8) */
/* If no error correction, do pitch and voicing then jump to decode */
i4 = detau[*ipitv];
if (! contrl_1.corrp) {
voice[1] = 1;
voice[2] = 1;
if (*ipitv <= 1) {
voice[1] = 0;
}
if (*ipitv == 0 || *ipitv == 2) {
voice[2] = 0;
}
*pitch = i4;
if (*pitch <= 4) {
*pitch = *iptold;
}
if (voice[1] == 1 && voice[2] == 1) {
*iptold = *pitch;
}
if (voice[1] != voice[2]) {
*pitch = *iptold;
}
goto L900;
}
/* Do error correction pitch and voicing */
if (i4 > 4) {
dpit[0] = i4;
ivoic = 2;
*iavgp = (*iavgp * 15 + i4 + 8) / 16;
} else {
ivoic = i4;
dpit[0] = *iavgp;
}
drms[0] = *irms;
i__1 = contrl_1.order;
for (i__ = 1; i__ <= i__1; ++i__) {
drc[i__ * 3 - 3] = irc[i__];
}
/* Determine index to IVTAB from V/UV decision */
/* If error rate is high then use alternate table */
index = (*ivp2h << 4) + (*iovoic << 2) + ivoic + 1;
i1 = ivtab[index - 1];
ipit = i1 & 3;
icorf = i1 / 8;
if (*erate < ethrs) {
icorf /= 64;
}
/* Determine error rate: 4=high 1=low */
ixcor = 4;
if (*erate < ethrs3) {
ixcor = 3;
}
if (*erate < ethrs2) {
ixcor = 2;
}
if (*erate < ethrs1) {
ixcor = 1;
}
/* Voice/unvoice decision determined from bits 0 and 1 of IVTAB */
voice[1] = icorf / 2 & 1;
voice[2] = icorf & 1;
/* Skip decoding on first frame because present data not yet available */
if (*first) {
*first = FALSE_;
/* Assign PITCH a "default" value on the first call, since */
/* otherwise it would be left uninitialized. The two lines
*/
/* below were copied from above, since it seemed like a */
/* reasonable thing to do for the first call. */
*pitch = i4;
if (*pitch <= 4) {
*pitch = *iptold;
}
goto L500;
}
/* If bit 4 of ICORF is set then correct RMS and RC(1) - RC(4). */
/* Determine error rate and correct errors using a Hamming 8,4 code */
/* during transition or unvoiced frame. If IOUT is negative, */
/* more than 1 error occurred, use previous frame's parameters. */
if ((icorf & bit[3]) != 0) {
errcnt = 0;
lsb = drms[1] & 1;
index = (drc[22] << 4) + drms[1] / 2;
ham84_(&index, &iout, &errcnt);
drms[1] = drms[2];
if (iout >= 0) {
drms[1] = (iout << 1) + lsb;
}
for (i__ = 1; i__ <= 4; ++i__) {
if (i__ == 1) {
i1 = ((drc[25] & 7) << 1) + (drc[28] & 1);
} else {
i1 = drc[(9 - i__) * 3 - 2] & 15;
}
i2 = drc[(5 - i__) * 3 - 2] & 31;
lsb = i2 & 1;
index = (i1 << 4) + i2 / 2;
ham84_(&index, &iout, &errcnt);
if (iout >= 0) {
iout = (iout << 1) + lsb;
if ((iout & 16) == 16) {
iout += -32;
}
} else {
iout = drc[(5 - i__) * 3 - 1];
}
drc[(5 - i__) * 3 - 2] = iout;
}
/* Determine error rate */
*erate = *erate * .96875f + errcnt * 102;
}
/* Get unsmoothed RMS, RC's, and PITCH */
*irms = drms[1];
i__1 = contrl_1.order;
for (i__ = 1; i__ <= i__1; ++i__) {
irc[i__] = drc[i__ * 3 - 2];
}
if (ipit == 1) {
dpit[1] = dpit[2];
}
if (ipit == 3) {
dpit[1] = dpit[0];
}
*pitch = dpit[1];
/* If bit 2 of ICORF is set then smooth RMS and RC's, */
if ((icorf & bit[1]) != 0) {
if ((i__1 = drms[1] - drms[0], (real) abs(i__1)) >= corth[ixcor + 3]
&& (i__2 = drms[1] - drms[2], (real) abs(i__2)) >= corth[
ixcor + 3]) {
*irms = median_(&drms[2], &drms[1], drms);
}
for (i__ = 1; i__ <= 6; ++i__) {
if ((i__1 = drc[i__ * 3 - 2] - drc[i__ * 3 - 3], (real) abs(i__1))
>= corth[ixcor + (i__ + 2 << 2) - 5] && (i__2 = drc[i__ *
3 - 2] - drc[i__ * 3 - 1], (real) abs(i__2)) >= corth[
ixcor + (i__ + 2 << 2) - 5]) {
irc[i__] = median_(&drc[i__ * 3 - 1], &drc[i__ * 3 - 2], &drc[
i__ * 3 - 3]);
}
}
}
/* If bit 3 of ICORF is set then smooth pitch */
if ((icorf & bit[2]) != 0) {
if ((i__1 = dpit[1] - dpit[0], (real) abs(i__1)) >= corth[ixcor - 1]
&& (i__2 = dpit[1] - dpit[2], (real) abs(i__2)) >= corth[
ixcor - 1]) {
*pitch = median_(&dpit[2], &dpit[1], dpit);
}
}
/* If bit 5 of ICORF is set then RC(5) - RC(10) are loaded with */
/* values so that after quantization bias is removed in decode */
/* the values will be zero. */
L500:
if ((icorf & bit[4]) != 0) {
i__1 = contrl_1.order;
for (i__ = 5; i__ <= i__1; ++i__) {
irc[i__] = zrc[i__ - 1];
}
}
/* House keeping - one frame delay */
*iovoic = ivoic;
*ivp2h = voice[2];
dpit[2] = dpit[1];
dpit[1] = dpit[0];
drms[2] = drms[1];
drms[1] = drms[0];
i__1 = contrl_1.order;
for (i__ = 1; i__ <= i__1; ++i__) {
drc[i__ * 3 - 1] = drc[i__ * 3 - 2];
drc[i__ * 3 - 2] = drc[i__ * 3 - 3];
}
L900:
/* IF (LISTL.GE.3)WRITE(FDEBUG,801)VOICE,PITCH,IRMS,(IRC(J),J=1,ORDER) */
/* 801 FORMAT(1X,'<<ERRCOR OUT>>',T32,2I3,I6,I5,T50,10I8) */
/* Decode RMS */
*irms = rmst[(31 - *irms) * 2];
/* Decode RC(1) and RC(2) from log-area-ratios */
/* Protect from illegal coded value (-16) caused by bit errors */
for (i__ = 1; i__ <= 2; ++i__) {
i2 = irc[i__];
i1 = 0;
if (i2 < 0) {
i1 = 1;
i2 = -i2;
if (i2 > 15) {
i2 = 0;
}
}
i2 = detab7[i2 * 2];
if (i1 == 1) {
i2 = -i2;
}
ishift = 15 - nbit[i__ - 1];
irc[i__] = i2 * pow_ii(&c__2, &ishift);
}
/* Decode RC(3)-RC(10) to sign plus 14 bits */
i__1 = contrl_1.order;
for (i__ = 3; i__ <= i__1; ++i__) {
i2 = irc[i__];
ishift = 15 - nbit[i__ - 1];
i2 *= pow_ii(&c__2, &ishift);
i2 += qb[i__ - 3];
irc[i__] = i2 * descl[i__ - 3] + deadd[i__ - 3];
}
/* IF (LISTL.GE.3) WRITE(FDEBUG,811) IRMS, (IRC(I),I=1,ORDER) */
/* 811 FORMAT(1X,'<<DECODE OUT>>',T45,I4,1X,10I8) */
/* Scale RMS and RC's to reals */
*rms = (real) (*irms);
i__1 = contrl_1.order;
for (i__ = 1; i__ <= i__1; ++i__) {
rc[i__] = irc[i__] / 16384.f;
}
return 0;
} /* decode_ */

142
codecs/lpc10/deemp.c Executable file
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/*
$Log$
Revision 1.1 2000/01/05 08:20:39 markster
Version 0.1.2 from FTP
Revision 1.2 2000/01/05 08:20:39 markster
Some OSS fixes and a few lpc changes to make it actually work
* Revision 1.2 1996/08/20 20:23:46 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_decoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_decoder_state().
*
* Revision 1.1 1996/08/19 22:32:34 jaf
* Initial revision
*
*/
#ifdef P_R_O_T_O_T_Y_P_E_S
extern int deemp_(real *x, integer *n, struct lpc10_decoder_state *st);
#endif
/* -- translated by f2c (version 19951025).
You must link the resulting object file with the libraries:
-lf2c -lm (in that order)
*/
#include "f2c.h"
/* ***************************************************************** */
/* DEEMP Version 48 */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.2 1996/08/20 20:23:46 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_decoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_decoder_state().
*
* Revision 1.1 1996/08/19 22:32:34 jaf
* Initial revision
* */
/* Revision 1.3 1996/03/20 15:54:37 jaf */
/* Added comments about which indices of array arguments are read or */
/* written. */
/* Added entry INITDEEMP to reinitialize the local state variables, if */
/* desired. */
/* Revision 1.2 1996/03/14 22:11:13 jaf */
/* Comments added explaining which of the local variables of this */
/* subroutine need to be saved from one invocation to the next, and which */
/* do not. */
/* Revision 1.1 1996/02/07 14:44:53 jaf */
/* Initial revision */
/* ***************************************************************** */
/* De-Emphasize output speech with 1 / ( 1 - .75z**-1 ) */
/* cascaded with 200 Hz high pass filter */
/* ( 1 - 1.9998z**-1 + z**-2 ) / ( 1 - 1.75z**-1 + .78z**-2 ) */
/* WARNING! The coefficients above may be out of date with the code */
/* below. Either that, or some kind of transformation was performed */
/* on the coefficients above to create the code below. */
/* Input: */
/* N - Number of samples */
/* Input/Output: */
/* X - Speech */
/* Indices 1 through N are read before being written. */
/* This subroutine maintains local state from one call to the next. If */
/* you want to switch to using a new audio stream for this filter, or */
/* reinitialize its state for any other reason, call the ENTRY */
/* INITDEEMP. */
/* Subroutine */ int deemp_(real *x, integer *n, struct lpc10_decoder_state *st)
{
/* Initialized data */
real *dei1;
real *dei2;
real *deo1;
real *deo2;
real *deo3;
/* System generated locals */
integer i__1;
real r__1;
/* Local variables */
integer k;
real dei0;
/* Arguments */
/* Local variables that need not be saved */
/* Local state */
/* All of the locals saved below were not given explicit initial */
/* values in the original code. I think 0 is a safe choice. */
/* Parameter adjustments */
if (x) {
--x;
}
/* Function Body */
dei1 = &(st->dei1);
dei2 = &(st->dei2);
deo1 = &(st->deo1);
deo2 = &(st->deo2);
deo3 = &(st->deo3);
i__1 = *n;
for (k = 1; k <= i__1; ++k) {
dei0 = x[k];
r__1 = x[k] - *dei1 * 1.9998f + *dei2;
x[k] = r__1 + *deo1 * 2.5f - *deo2 * 2.0925f + *deo3 * .585f;
*dei2 = *dei1;
*dei1 = dei0;
*deo3 = *deo2;
*deo2 = *deo1;
*deo1 = x[k];
}
return 0;
} /* deemp_ */

121
codecs/lpc10/difmag.c Executable file
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/*
$Log$
Revision 1.1 2000/01/05 08:20:39 markster
Version 0.1.2 from FTP
Revision 1.2 2000/01/05 08:20:39 markster
Some OSS fixes and a few lpc changes to make it actually work
* Revision 1.1 1996/08/19 22:32:31 jaf
* Initial revision
*
*/
#ifdef P_R_O_T_O_T_Y_P_E_S
extern int difmag_(real *speech, integer *lpita, integer *tau, integer *ltau, integer *maxlag, real *amdf, integer *minptr, integer *maxptr);
#endif
/* -- translated by f2c (version 19951025).
You must link the resulting object file with the libraries:
-lf2c -lm (in that order)
*/
#include "f2c.h"
/* ********************************************************************** */
/* DIFMAG Version 49 */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.1 1996/08/19 22:32:31 jaf
* Initial revision
* */
/* Revision 1.3 1996/03/15 23:09:39 jaf */
/* Just added a few comments about which array indices of the arguments */
/* are used, and mentioning that this subroutine has no local state. */
/* Revision 1.2 1996/03/13 14:41:31 jaf */
/* Comments added explaining that none of the local variables of this */
/* subroutine need to be saved from one invocation to the next. */
/* Revision 1.1 1996/02/07 14:45:04 jaf */
/* Initial revision */
/* ********************************************************************* */
/* Compute Average Magnitude Difference Function */
/* Inputs: */
/* SPEECH - Low pass filtered speech */
/* Indices MIN_N1 through MAX_N1+LPITA-1 are read, where */
/* MIN_N1 = (MAXLAG - MAX_TAU)/2+1 MAX_TAU = max of TAU(I) for I=1,LTAU
*/
/* MAX_N1 = (MAXLAG - MIN_TAU)/2+1 MIN_TAU = min of TAU(I) for I=1,LTAU
*/
/* LPITA - Length of speech buffer */
/* TAU - Table of lags */
/* Indices 1 through LTAU read. */
/* LTAU - Number of lag values to compute */
/* MAXLAG - Maximum possible lag value */
/* Outputs: */
/* (All of these outputs are also read, but only after being written.) */
/* AMDF - Average Magnitude Difference for each lag in TAU */
/* Indices 1 through LTAU written */
/* MINPTR - Index of minimum AMDF value */
/* MAXPTR - Index of maximum AMDF value */
/* This subroutine has no local state. */
/* Subroutine */ int difmag_(real *speech, integer *lpita, integer *tau,
integer *ltau, integer *maxlag, real *amdf, integer *minptr, integer *
maxptr)
{
/* System generated locals */
integer i__1, i__2;
real r__1;
/* Local variables */
integer i__, j, n1, n2;
real sum;
/* Arguments */
/* Local variables that need not be saved */
/* Local state */
/* None */
/* Parameter adjustments */
--amdf;
--tau;
--speech;
/* Function Body */
*minptr = 1;
*maxptr = 1;
i__1 = *ltau;
for (i__ = 1; i__ <= i__1; ++i__) {
n1 = (*maxlag - tau[i__]) / 2 + 1;
n2 = n1 + *lpita - 1;
sum = 0.f;
i__2 = n2;
for (j = n1; j <= i__2; j += 4) {
sum += (r__1 = speech[j] - speech[j + tau[i__]], abs(r__1));
}
amdf[i__] = sum;
if (amdf[i__] < amdf[*minptr]) {
*minptr = i__;
}
if (amdf[i__] > amdf[*maxptr]) {
*maxptr = i__;
}
}
return 0;
} /* difmag_ */

387
codecs/lpc10/dyptrk.c Executable file
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/*
$Log$
Revision 1.1 2000/01/05 08:20:39 markster
Version 0.1.2 from FTP
Revision 1.2 2000/01/05 08:20:39 markster
Some OSS fixes and a few lpc changes to make it actually work
* Revision 1.2 1996/08/20 20:25:29 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_encoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_encoder_state().
*
* Revision 1.1 1996/08/19 22:32:26 jaf
* Initial revision
*
*/
#ifdef P_R_O_T_O_T_Y_P_E_S
extern int dyptrk_(real *amdf, integer *ltau, integer *minptr, integer *voice, integer *pitch, integer *midx, struct lpc10_encoder_state *st);
/* comlen contrl_ 12 */
#endif
/* -- translated by f2c (version 19951025).
You must link the resulting object file with the libraries:
-lf2c -lm (in that order)
*/
#include "f2c.h"
/* Common Block Declarations */
extern struct {
integer order, lframe;
logical corrp;
} contrl_;
#define contrl_1 contrl_
/* ********************************************************************* */
/* DYPTRK Version 52 */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.2 1996/08/20 20:25:29 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_encoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_encoder_state().
*
* Revision 1.1 1996/08/19 22:32:26 jaf
* Initial revision
* */
/* Revision 1.5 1996/03/26 19:35:35 jaf */
/* Commented out trace statements. */
/* Revision 1.4 1996/03/19 18:03:22 jaf */
/* Replaced the initialization "DATA P/60*DEPTH*0/" with "DATA P/120*0/", */
/* because apparently Fortran (or at least f2c) can't handle expressions */
/* like that. */
/* Revision 1.3 1996/03/19 17:38:32 jaf */
/* Added comments about the local variables that should be saved from one */
/* invocation to the next. None of them were given initial values in the */
/* original code, but from my testing, it appears that initializing them */
/* all to 0 works. */
/* Added entry INITDYPTRK to reinitialize these local variables. */
/* Revision 1.2 1996/03/13 16:32:17 jaf */
/* Comments added explaining which of the local variables of this */
/* subroutine need to be saved from one invocation to the next, and which */
/* do not. */
/* WARNING! Some of them that should are never given initial values in */
/* this code. Hopefully, Fortran 77 defines initial values for them, but */
/* even so, giving them explicit initial values is preferable. */
/* Revision 1.1 1996/02/07 14:45:14 jaf */
/* Initial revision */
/* ********************************************************************* */
/* Dynamic Pitch Tracker */
/* Input: */
/* AMDF - Average Magnitude Difference Function array */
/* Indices 1 through LTAU read, and MINPTR */
/* LTAU - Number of lags in AMDF */
/* MINPTR - Location of minimum AMDF value */
/* VOICE - Voicing decision */
/* Output: */
/* PITCH - Smoothed pitch value, 2 frames delayed */
/* MIDX - Initial estimate of current frame pitch */
/* Compile time constant: */
/* DEPTH - Number of frames to trace back */
/* This subroutine maintains local state from one call to the next. If */
/* you want to switch to using a new audio stream for this filter, or */
/* reinitialize its state for any other reason, call the ENTRY */
/* INITDYPTRK. */
/* Subroutine */ int dyptrk_(real *amdf, integer *ltau, integer *
minptr, integer *voice, integer *pitch, integer *midx,
struct lpc10_encoder_state *st)
{
/* Initialized data */
real *s;
integer *p;
integer *ipoint;
real *alphax;
/* System generated locals */
integer i__1;
/* Local variables */
integer pbar;
real sbar;
integer path[2], iptr, i__, j;
real alpha, minsc, maxsc;
/* Arguments */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.2 1996/08/20 20:25:29 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_encoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_encoder_state().
*
* Revision 1.1 1996/08/19 22:32:26 jaf
* Initial revision
* */
/* Revision 1.3 1996/03/29 22:05:55 jaf */
/* Commented out the common block variables that are not needed by the */
/* embedded version. */
/* Revision 1.2 1996/03/26 19:34:50 jaf */
/* Added comments indicating which constants are not needed in an */
/* application that uses the LPC-10 coder. */
/* Revision 1.1 1996/02/07 14:44:09 jaf */
/* Initial revision */
/* LPC Processing control variables: */
/* *** Read-only: initialized in setup */
/* Files for Speech, Parameter, and Bitstream Input & Output, */
/* and message and debug outputs. */
/* Here are the only files which use these variables: */
/* lpcsim.f setup.f trans.f error.f vqsetup.f */
/* Many files which use fdebug are not listed, since it is only used in */
/* those other files conditionally, to print trace statements. */
/* integer fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
/* LPC order, Frame size, Quantization rate, Bits per frame, */
/* Error correction */
/* Subroutine SETUP is the only place where order is assigned a value, */
/* and that value is 10. It could increase efficiency 1% or so to */
/* declare order as a constant (i.e., a Fortran PARAMETER) instead of as
*/
/* a variable in a COMMON block, since it is used in many places in the */
/* core of the coding and decoding routines. Actually, I take that back.
*/
/* At least when compiling with f2c, the upper bound of DO loops is */
/* stored in a local variable before the DO loop begins, and then that is
*/
/* compared against on each iteration. */
/* Similarly for lframe, which is given a value of MAXFRM in SETUP. */
/* Similarly for quant, which is given a value of 2400 in SETUP. quant */
/* is used in only a few places, and never in the core coding and */
/* decoding routines, so it could be eliminated entirely. */
/* nbits is similar to quant, and is given a value of 54 in SETUP. */
/* corrp is given a value of .TRUE. in SETUP, and is only used in the */
/* subroutines ENCODE and DECODE. It doesn't affect the speed of the */
/* coder significantly whether it is .TRUE. or .FALSE., or whether it is
*/
/* a constant or a variable, since it is only examined once per frame. */
/* Leaving it as a variable that is set to .TRUE. seems like a good */
/* idea, since it does enable some error-correction capability for */
/* unvoiced frames, with no change in the coding rate, and no noticeable
*/
/* quality difference in the decoded speech. */
/* integer quant, nbits */
/* *** Read/write: variables for debugging, not needed for LPC algorithm
*/
/* Current frame, Unstable frames, Output clip count, Max onset buffer,
*/
/* Debug listing detail level, Line count on listing page */
/* nframe is not needed for an embedded LPC10 at all. */
/* nunsfm is initialized to 0 in SETUP, and incremented in subroutine */
/* ERROR, which is only called from RCCHK. When LPC10 is embedded into */
/* an application, I would recommend removing the call to ERROR in RCCHK,
*/
/* and remove ERROR and nunsfm completely. */
/* iclip is initialized to 0 in SETUP, and incremented in entry SWRITE in
*/
/* sread.f. When LPC10 is embedded into an application, one might want */
/* to cause it to be incremented in a routine that takes the output of */
/* SYNTHS and sends it to an audio device. It could be optionally */
/* displayed, for those that might want to know what it is. */
/* maxosp is never initialized to 0 in SETUP, although it probably should
*/
/* be, and it is updated in subroutine ANALYS. I doubt that its value */
/* would be of much interest to an application in which LPC10 is */
/* embedded. */
/* listl and lincnt are not needed for an embedded LPC10 at all. */
/* integer nframe, nunsfm, iclip, maxosp, listl, lincnt */
/* common /contrl/ fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
/* common /contrl/ quant, nbits */
/* common /contrl/ nframe, nunsfm, iclip, maxosp, listl, lincnt */
/* Parameters/constants */
/* Local variables that need not be saved */
/* Note that PATH is only used for debugging purposes, and can be */
/* removed. */
/* Local state */
/* It would be a bit more "general" to define S(LTAU), if Fortran */
/* allows the argument of a function to be used as the dimension of
*/
/* a local array variable. */
/* IPOINT is always in the range 0 to DEPTH-1. */
/* WARNING! */
/* In the original version of this subroutine, IPOINT, ALPHAX, */
/* every element of S, and potentially any element of P with the */
/* second index value .NE. IPTR were read without being given */
/* initial values (all indices of P with second index equal to */
/* IPTR are all written before being read in this subroutine). */
/* From examining the code carefully, it appears that all of these
*/
/* should be saved from one invocation to the next. */
/* I've run lpcsim with the "-l 6" option to see all of the */
/* debugging information that is printed out by this subroutine */
/* below, and it appears that S, P, IPOINT, and ALPHAX are all */
/* initialized to 0 (these initial values would likely be different
*/
/* on different platforms, compilers, etc.). Given that the output
*/
/* of the coder sounds reasonable, I'm going to initialize these */
/* variables to 0 explicitly. */
s = &(st->s[0]);
p = &(st->p[0]);
ipoint = &(st->ipoint);
alphax = &(st->alphax);
/* Parameter adjustments */
if (amdf) {
--amdf;
}
/* Function Body */
/* Calculate the confidence factor ALPHA, used as a threshold slope in
*/
/* SEESAW. If unvoiced, set high slope so that every point in P array
*/
/* is marked as a potential pitch frequency. A scaled up version (ALPHAX
)*/
/* is used to maintain arithmetic precision. */
if (*voice == 1) {
*alphax = *alphax * .75f + amdf[*minptr] / 2.f;
} else {
*alphax *= .984375f;
}
alpha = *alphax / 16;
if (*voice == 0 && *alphax < 128.f) {
alpha = 8.f;
}
/* SEESAW: Construct a pitch pointer array and intermediate winner functio
n*/
/* Left to right pass: */
iptr = *ipoint + 1;
p[iptr * 60 - 60] = 1;
i__ = 1;
pbar = 1;
sbar = s[0];
i__1 = *ltau;
for (i__ = 1; i__ <= i__1; ++i__) {
sbar += alpha;
if (sbar < s[i__ - 1]) {
s[i__ - 1] = sbar;
p[i__ + iptr * 60 - 61] = pbar;
} else {
sbar = s[i__ - 1];
p[i__ + iptr * 60 - 61] = i__;
pbar = i__;
}
}
/* Right to left pass: */
i__ = pbar - 1;
sbar = s[i__];
while(i__ >= 1) {
sbar += alpha;
if (sbar < s[i__ - 1]) {
s[i__ - 1] = sbar;
p[i__ + iptr * 60 - 61] = pbar;
} else {
pbar = p[i__ + iptr * 60 - 61];
i__ = pbar;
sbar = s[i__ - 1];
}
--i__;
}
/* Update S using AMDF */
/* Find maximum, minimum, and location of minimum */
s[0] += amdf[1] / 2;
minsc = s[0];
maxsc = minsc;
*midx = 1;
i__1 = *ltau;
for (i__ = 2; i__ <= i__1; ++i__) {
s[i__ - 1] += amdf[i__] / 2;
if (s[i__ - 1] > maxsc) {
maxsc = s[i__ - 1];
}
if (s[i__ - 1] < minsc) {
*midx = i__;
minsc = s[i__ - 1];
}
}
/* Subtract MINSC from S to prevent overflow */
i__1 = *ltau;
for (i__ = 1; i__ <= i__1; ++i__) {
s[i__ - 1] -= minsc;
}
maxsc -= minsc;
/* Use higher octave pitch if significant null there */
j = 0;
for (i__ = 20; i__ <= 40; i__ += 10) {
if (*midx > i__) {
if (s[*midx - i__ - 1] < maxsc / 4) {
j = i__;
}
}
}
*midx -= j;
/* TRACE: look back two frames to find minimum cost pitch estimate */
j = *ipoint;
*pitch = *midx;
for (i__ = 1; i__ <= 2; ++i__) {
j = j % 2 + 1;
*pitch = p[*pitch + j * 60 - 61];
path[i__ - 1] = *pitch;
}
/* The following statement subtracts one from IPOINT, mod DEPTH. I
*/
/* think the author chose to add DEPTH-1, instead of subtracting 1,
*/
/* because then it will work even if MOD doesn't work as desired on
*/
/* negative arguments. */
*ipoint = (*ipoint + 1) % 2;
return 0;
} /* dyptrk_ */

349
codecs/lpc10/encode.c Executable file
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@@ -0,0 +1,349 @@
/*
$Log$
Revision 1.1 2000/01/05 08:20:39 markster
Version 0.1.2 from FTP
Revision 1.2 2000/01/05 08:20:39 markster
Some OSS fixes and a few lpc changes to make it actually work
* Revision 1.1 1996/08/19 22:32:21 jaf
* Initial revision
*
*/
#ifdef P_R_O_T_O_T_Y_P_E_S
extern int encode_(integer *voice, integer *pitch, real *rms, real *rc, integer *ipitch, integer *irms, integer *irc);
/* comlen contrl_ 12 */
#endif
/* -- translated by f2c (version 19951025).
You must link the resulting object file with the libraries:
-lf2c -lm (in that order)
*/
#include "f2c.h"
/* Common Block Declarations */
extern struct {
integer order, lframe;
logical corrp;
} contrl_;
#define contrl_1 contrl_
/* Table of constant values */
static integer c__2 = 2;
/* ***************************************************************** */
/* ENCODE Version 54 */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.1 1996/08/19 22:32:21 jaf
* Initial revision
* */
/* Revision 1.5 1996/03/26 19:35:50 jaf */
/* Commented out trace statements. */
/* Revision 1.4 1996/03/21 00:26:29 jaf */
/* Added the comment that this subroutine has no local state. */
/* In the last check-in, I forgot to mention that I had added comments */
/* explaining which indices of array arguments are read or written. */
/* Revision 1.3 1996/03/21 00:22:39 jaf */
/* Added comments explaining that all local arrays are effectively */
/* constants. */
/* Revision 1.2 1996/03/13 18:48:33 jaf */
/* Comments added explaining that none of the local variables of this */
/* subroutine need to be saved from one invocation to the next. */
/* Revision 1.1 1996/02/07 14:45:29 jaf */
/* Initial revision */
/* ***************************************************************** */
/* Quantize LPC parameters for transmission */
/* INPUTS: */
/* VOICE - Half frame voicing decisions */
/* Indices 1 through 2 read. */
/* PITCH - Pitch */
/* RMS - Energy */
/* RC - Reflection coefficients */
/* Indices 1 through ORDER read. */
/* CORRP - Error Correction: TRUE = yes, FALSE = none */
/* (this is defined in file control.fh) */
/* OUTPUTS: */
/* IPITCH - Coded pitch and voicing */
/* IRMS - Quantized energy */
/* IRC - Quantized reflection coefficients */
/* Indices 1 through MAX(ORDER,2) written. */
/* If CORRP is .TRUE., then indices 1 through 10 written */
/* for unvoiced frames. */
/* This subroutine has no local state. */
/* Subroutine */ int encode_(integer *voice, integer *pitch, real *rms, real *
rc, integer *ipitch, integer *irms, integer *irc)
{
/* Initialized data */
static integer enctab[16] = { 0,7,11,12,13,10,6,1,14,9,5,2,3,4,8,15 };
static integer entau[60] = { 19,11,27,25,29,21,23,22,30,14,15,7,39,38,46,
42,43,41,45,37,53,49,51,50,54,52,60,56,58,26,90,88,92,84,86,82,83,
81,85,69,77,73,75,74,78,70,71,67,99,97,113,112,114,98,106,104,108,
100,101,76 };
static integer enadd[8] = { 1920,-768,2432,1280,3584,1536,2816,-1152 };
static real enscl[8] = { .0204f,.0167f,.0145f,.0147f,.0143f,.0135f,.0125f,
.0112f };
static integer enbits[8] = { 6,5,4,4,4,4,3,3 };
static integer entab6[64] = { 0,0,0,0,0,0,1,1,1,1,1,1,1,2,2,2,2,2,2,2,3,3,
3,3,3,3,3,4,4,4,4,4,4,4,5,5,5,5,5,6,6,6,6,6,7,7,7,7,7,8,8,8,8,9,9,
9,10,10,11,11,12,13,14,15 };
static integer rmst[64] = { 1024,936,856,784,718,656,600,550,502,460,420,
384,352,328,294,270,246,226,206,188,172,158,144,132,120,110,102,
92,84,78,70,64,60,54,50,46,42,38,34,32,30,26,24,22,20,18,17,16,15,
14,13,12,11,10,9,8,7,6,5,4,3,2,1,0 };
/* System generated locals */
integer i__1, i__2;
/* Builtin functions */
integer pow_ii(integer *, integer *);
/* Local variables */
integer idel, nbit, i__, j, i2, i3, mrk;
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.1 1996/08/19 22:32:21 jaf
* Initial revision
* */
/* Revision 1.3 1996/03/29 22:03:47 jaf */
/* Removed definitions for any constants that were no longer used. */
/* Revision 1.2 1996/03/26 19:34:33 jaf */
/* Added comments indicating which constants are not needed in an */
/* application that uses the LPC-10 coder. */
/* Revision 1.1 1996/02/07 14:43:51 jaf */
/* Initial revision */
/* LPC Configuration parameters: */
/* Frame size, Prediction order, Pitch period */
/* Arguments */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.1 1996/08/19 22:32:21 jaf
* Initial revision
* */
/* Revision 1.3 1996/03/29 22:05:55 jaf */
/* Commented out the common block variables that are not needed by the */
/* embedded version. */
/* Revision 1.2 1996/03/26 19:34:50 jaf */
/* Added comments indicating which constants are not needed in an */
/* application that uses the LPC-10 coder. */
/* Revision 1.1 1996/02/07 14:44:09 jaf */
/* Initial revision */
/* LPC Processing control variables: */
/* *** Read-only: initialized in setup */
/* Files for Speech, Parameter, and Bitstream Input & Output, */
/* and message and debug outputs. */
/* Here are the only files which use these variables: */
/* lpcsim.f setup.f trans.f error.f vqsetup.f */
/* Many files which use fdebug are not listed, since it is only used in */
/* those other files conditionally, to print trace statements. */
/* integer fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
/* LPC order, Frame size, Quantization rate, Bits per frame, */
/* Error correction */
/* Subroutine SETUP is the only place where order is assigned a value, */
/* and that value is 10. It could increase efficiency 1% or so to */
/* declare order as a constant (i.e., a Fortran PARAMETER) instead of as
*/
/* a variable in a COMMON block, since it is used in many places in the */
/* core of the coding and decoding routines. Actually, I take that back.
*/
/* At least when compiling with f2c, the upper bound of DO loops is */
/* stored in a local variable before the DO loop begins, and then that is
*/
/* compared against on each iteration. */
/* Similarly for lframe, which is given a value of MAXFRM in SETUP. */
/* Similarly for quant, which is given a value of 2400 in SETUP. quant */
/* is used in only a few places, and never in the core coding and */
/* decoding routines, so it could be eliminated entirely. */
/* nbits is similar to quant, and is given a value of 54 in SETUP. */
/* corrp is given a value of .TRUE. in SETUP, and is only used in the */
/* subroutines ENCODE and DECODE. It doesn't affect the speed of the */
/* coder significantly whether it is .TRUE. or .FALSE., or whether it is
*/
/* a constant or a variable, since it is only examined once per frame. */
/* Leaving it as a variable that is set to .TRUE. seems like a good */
/* idea, since it does enable some error-correction capability for */
/* unvoiced frames, with no change in the coding rate, and no noticeable
*/
/* quality difference in the decoded speech. */
/* integer quant, nbits */
/* *** Read/write: variables for debugging, not needed for LPC algorithm
*/
/* Current frame, Unstable frames, Output clip count, Max onset buffer,
*/
/* Debug listing detail level, Line count on listing page */
/* nframe is not needed for an embedded LPC10 at all. */
/* nunsfm is initialized to 0 in SETUP, and incremented in subroutine */
/* ERROR, which is only called from RCCHK. When LPC10 is embedded into */
/* an application, I would recommend removing the call to ERROR in RCCHK,
*/
/* and remove ERROR and nunsfm completely. */
/* iclip is initialized to 0 in SETUP, and incremented in entry SWRITE in
*/
/* sread.f. When LPC10 is embedded into an application, one might want */
/* to cause it to be incremented in a routine that takes the output of */
/* SYNTHS and sends it to an audio device. It could be optionally */
/* displayed, for those that might want to know what it is. */
/* maxosp is never initialized to 0 in SETUP, although it probably should
*/
/* be, and it is updated in subroutine ANALYS. I doubt that its value */
/* would be of much interest to an application in which LPC10 is */
/* embedded. */
/* listl and lincnt are not needed for an embedded LPC10 at all. */
/* integer nframe, nunsfm, iclip, maxosp, listl, lincnt */
/* common /contrl/ fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
/* common /contrl/ quant, nbits */
/* common /contrl/ nframe, nunsfm, iclip, maxosp, listl, lincnt */
/* Parameters/constants */
/* These arrays are not Fortran PARAMETER's, but they are defined */
/* by DATA statements below, and their contents are never altered.
*/
/* Local variables that need not be saved */
/* Parameter adjustments */
--irc;
--rc;
--voice;
/* Function Body */
/* Scale RMS and RC's to integers */
*irms = *rms;
i__1 = contrl_1.order;
for (i__ = 1; i__ <= i__1; ++i__) {
irc[i__] = rc[i__] * 32768.f;
}
/* IF(LISTL.GE.3)WRITE(FDEBUG,800)VOICE,PITCH,IRMS,(IRC(I),I=1,ORDER) */
/* 800 FORMAT(1X,/,' <<ENCODE IN>>',T32,2I3,I6,I5,T50,10I8) */
/* Encode pitch and voicing */
if (voice[1] != 0 && voice[2] != 0) {
*ipitch = entau[*pitch - 1];
} else {
if (contrl_1.corrp) {
*ipitch = 0;
if (voice[1] != voice[2]) {
*ipitch = 127;
}
} else {
*ipitch = (voice[1] << 1) + voice[2];
}
}
/* Encode RMS by binary table search */
j = 32;
idel = 16;
*irms = min(*irms,1023);
while(idel > 0) {
if (*irms > rmst[j - 1]) {
j -= idel;
}
if (*irms < rmst[j - 1]) {
j += idel;
}
idel /= 2;
}
if (*irms > rmst[j - 1]) {
--j;
}
*irms = 31 - j / 2;
/* Encode RC(1) and (2) as log-area-ratios */
for (i__ = 1; i__ <= 2; ++i__) {
i2 = irc[i__];
mrk = 0;
if (i2 < 0) {
i2 = -i2;
mrk = 1;
}
i2 /= 512;
i2 = min(i2,63);
i2 = entab6[i2];
if (mrk != 0) {
i2 = -i2;
}
irc[i__] = i2;
}
/* Encode RC(3) - (10) linearly, remove bias then scale */
i__1 = contrl_1.order;
for (i__ = 3; i__ <= i__1; ++i__) {
i2 = irc[i__] / 2;
i2 = (i2 + enadd[contrl_1.order + 1 - i__ - 1]) * enscl[
contrl_1.order + 1 - i__ - 1];
/* Computing MIN */
i__2 = max(i2,-127);
i2 = min(i__2,127);
nbit = enbits[contrl_1.order + 1 - i__ - 1];
i3 = 0;
if (i2 < 0) {
i3 = -1;
}
i2 /= pow_ii(&c__2, &nbit);
if (i3 == -1) {
--i2;
}
irc[i__] = i2;
}
/* Protect the most significant bits of the most */
/* important parameters during non-voiced frames. */
/* RC(1) - RC(4) are protected using 20 parity bits */
/* replacing RC(5) - RC(10). */
if (contrl_1.corrp) {
if (*ipitch == 0 || *ipitch == 127) {
irc[5] = enctab[(irc[1] & 30) / 2];
irc[6] = enctab[(irc[2] & 30) / 2];
irc[7] = enctab[(irc[3] & 30) / 2];
irc[8] = enctab[(*irms & 30) / 2];
irc[9] = enctab[(irc[4] & 30) / 2] / 2;
irc[10] = enctab[(irc[4] & 30) / 2] & 1;
}
}
/* IF(LISTL.GE.3)WRITE(FDEBUG,801)VOICE,IPITCH,IRMS,(IRC(J),J=1,ORDER) */
/* 801 FORMAT(1X,'<<ENCODE OUT>>',T32,2I3,I6,I5,T50,10I8) */
return 0;
} /* encode_ */

91
codecs/lpc10/energy.c Executable file
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/*
$Log$
Revision 1.1 2000/01/05 08:20:39 markster
Version 0.1.2 from FTP
Revision 1.2 2000/01/05 08:20:39 markster
Some OSS fixes and a few lpc changes to make it actually work
* Revision 1.1 1996/08/19 22:32:17 jaf
* Initial revision
*
*/
#ifdef P_R_O_T_O_T_Y_P_E_S
extern int energy_(integer *len, real *speech, real *rms);
#endif
/* -- translated by f2c (version 19951025).
You must link the resulting object file with the libraries:
-lf2c -lm (in that order)
*/
#include "f2c.h"
/* ********************************************************************* */
/* ENERGY Version 50 */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.1 1996/08/19 22:32:17 jaf
* Initial revision
* */
/* Revision 1.3 1996/03/18 21:17:41 jaf */
/* Just added a few comments about which array indices of the arguments */
/* are used, and mentioning that this subroutine has no local state. */
/* Revision 1.2 1996/03/13 16:46:02 jaf */
/* Comments added explaining that none of the local variables of this */
/* subroutine need to be saved from one invocation to the next. */
/* Revision 1.1 1996/02/07 14:45:40 jaf */
/* Initial revision */
/* ********************************************************************* */
/* Compute RMS energy. */
/* Input: */
/* LEN - Length of speech buffer */
/* SPEECH - Speech buffer */
/* Indices 1 through LEN read. */
/* Output: */
/* RMS - Root Mean Square energy */
/* This subroutine has no local state. */
/* Subroutine */ int energy_(integer *len, real *speech, real *rms)
{
/* System generated locals */
integer i__1;
/* Builtin functions */
double sqrt(doublereal);
/* Local variables */
integer i__;
/* Arguments */
/* Local variables that need not be saved */
/* Parameter adjustments */
--speech;
/* Function Body */
*rms = 0.f;
i__1 = *len;
for (i__ = 1; i__ <= i__1; ++i__) {
*rms += speech[i__] * speech[i__];
}
*rms = sqrt(*rms / *len);
return 0;
} /* energy_ */

252
codecs/lpc10/f2c.h Executable file
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/*
$Log$
Revision 1.1 2000/01/05 08:20:39 markster
Version 0.1.2 from FTP
Revision 1.2 2000/01/05 08:20:39 markster
Some OSS fixes and a few lpc changes to make it actually work
* Revision 1.2 1996/08/20 20:26:28 jaf
* Any typedef defining a type that was used in lpc10_encoder_state or
* lpc10_decoder_state struct's was commented out here and added to
* lpc10.h.
*
* Revision 1.1 1996/08/19 22:32:13 jaf
* Initial revision
*
*/
/*
* f2c.h
*
* SCCS ID: @(#)f2c.h 1.2 96/05/19
*/
/* f2c.h -- Standard Fortran to C header file */
/** barf [ba:rf] 2. "He suggested using FORTRAN, and everybody barfed."
- From The Shogakukan DICTIONARY OF NEW ENGLISH (Second edition) */
#ifndef F2C_INCLUDE
#define F2C_INCLUDE
#include "lpc10.h"
/*typedef long int integer;*/
/*typedef INT32 integer;*/
/*typedef short int shortint;*/
/*typedef INT16 shortint;*/
/*typedef float real;*/
/* doublereal only used for function arguments to sqrt, exp, etc. */
typedef double doublereal;
/* 32 bits seems wasteful, but there really aren't that many logical
* variables around, and making them 32 bits could avoid word
* alignment problems, perhaps. */
/*typedef long int logical;*/
/*typedef INT32 logical;*/
/* The following types are not used in the translated C code for the
* LPC-10 coder, but they might be needed by the definitions down
* below, so they don't cause compilation errors. */
typedef char *address;
typedef struct { real r, i; } complex;
typedef struct { doublereal r, i; } doublecomplex;
typedef short int shortlogical;
typedef char logical1;
typedef char integer1;
/* typedef long long longint; */ /* system-dependent */
#define TRUE_ (1)
#define FALSE_ (0)
/* Extern is for use with -E */
#ifndef Extern
#define Extern extern
#endif
/* I/O stuff */
#ifdef f2c_i2
/* for -i2 */
typedef short flag;
typedef short ftnlen;
typedef short ftnint;
#else
typedef long int flag;
typedef long int ftnlen;
typedef long int ftnint;
#endif
/*external read, write*/
typedef struct
{ flag cierr;
ftnint ciunit;
flag ciend;
char *cifmt;
ftnint cirec;
} cilist;
/*internal read, write*/
typedef struct
{ flag icierr;
char *iciunit;
flag iciend;
char *icifmt;
ftnint icirlen;
ftnint icirnum;
} icilist;
/*open*/
typedef struct
{ flag oerr;
ftnint ounit;
char *ofnm;
ftnlen ofnmlen;
char *osta;
char *oacc;
char *ofm;
ftnint orl;
char *oblnk;
} olist;
/*close*/
typedef struct
{ flag cerr;
ftnint cunit;
char *csta;
} cllist;
/*rewind, backspace, endfile*/
typedef struct
{ flag aerr;
ftnint aunit;
} alist;
/* inquire */
typedef struct
{ flag inerr;
ftnint inunit;
char *infile;
ftnlen infilen;
ftnint *inex; /*parameters in standard's order*/
ftnint *inopen;
ftnint *innum;
ftnint *innamed;
char *inname;
ftnlen innamlen;
char *inacc;
ftnlen inacclen;
char *inseq;
ftnlen inseqlen;
char *indir;
ftnlen indirlen;
char *infmt;
ftnlen infmtlen;
char *inform;
ftnint informlen;
char *inunf;
ftnlen inunflen;
ftnint *inrecl;
ftnint *innrec;
char *inblank;
ftnlen inblanklen;
} inlist;
#define VOID void
union Multitype { /* for multiple entry points */
integer1 g;
shortint h;
integer i;
/* longint j; */
real r;
doublereal d;
complex c;
doublecomplex z;
};
typedef union Multitype Multitype;
/*typedef long int Long;*/ /* No longer used; formerly in Namelist */
struct Vardesc { /* for Namelist */
char *name;
char *addr;
ftnlen *dims;
int type;
};
typedef struct Vardesc Vardesc;
struct Namelist {
char *name;
Vardesc **vars;
int nvars;
};
typedef struct Namelist Namelist;
#define abs(x) ((x) >= 0 ? (x) : -(x))
#define dabs(x) (doublereal)abs(x)
#define min(a,b) ((a) <= (b) ? (a) : (b))
#define max(a,b) ((a) >= (b) ? (a) : (b))
#define dmin(a,b) (doublereal)min(a,b)
#define dmax(a,b) (doublereal)max(a,b)
/* procedure parameter types for -A and -C++ */
#define F2C_proc_par_types 1
#ifdef __cplusplus
typedef int /* Unknown procedure type */ (*U_fp)(...);
typedef shortint (*J_fp)(...);
typedef integer (*I_fp)(...);
typedef real (*R_fp)(...);
typedef doublereal (*D_fp)(...), (*E_fp)(...);
typedef /* Complex */ VOID (*C_fp)(...);
typedef /* Double Complex */ VOID (*Z_fp)(...);
typedef logical (*L_fp)(...);
typedef shortlogical (*K_fp)(...);
typedef /* Character */ VOID (*H_fp)(...);
typedef /* Subroutine */ int (*S_fp)(...);
#else
typedef int /* Unknown procedure type */ (*U_fp)();
typedef shortint (*J_fp)();
typedef integer (*I_fp)();
typedef real (*R_fp)();
typedef doublereal (*D_fp)(), (*E_fp)();
typedef /* Complex */ VOID (*C_fp)();
typedef /* Double Complex */ VOID (*Z_fp)();
typedef logical (*L_fp)();
typedef shortlogical (*K_fp)();
typedef /* Character */ VOID (*H_fp)();
typedef /* Subroutine */ int (*S_fp)();
#endif
/* E_fp is for real functions when -R is not specified */
typedef VOID C_f; /* complex function */
typedef VOID H_f; /* character function */
typedef VOID Z_f; /* double complex function */
typedef doublereal E_f; /* real function with -R not specified */
/* undef any lower-case symbols that your C compiler predefines, e.g.: */
#ifndef Skip_f2c_Undefs
#undef cray
#undef gcos
#undef mc68010
#undef mc68020
#undef mips
#undef pdp11
#undef sgi
#undef sparc
#undef sun
#undef sun2
#undef sun3
#undef sun4
#undef u370
#undef u3b
#undef u3b2
#undef u3b5
#undef unix
#undef vax
#endif
#endif

82
codecs/lpc10/f2clib.c Executable file
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/*
$Log$
Revision 1.1 2000/01/05 08:20:39 markster
Version 0.1.2 from FTP
Revision 1.2 2000/01/05 08:20:39 markster
Some OSS fixes and a few lpc changes to make it actually work
* Revision 1.1 1996/08/19 22:32:10 jaf
* Initial revision
*
*/
/*
* f2clib.c
*
* SCCS ID: @(#)f2clib.c 1.2 96/05/19
*/
#include "f2c.h"
#ifdef KR_headers
integer pow_ii(ap, bp) integer *ap, *bp;
#else
integer pow_ii(integer *ap, integer *bp)
#endif
{
integer pow, x, n;
unsigned long u;
x = *ap;
n = *bp;
if (n <= 0) {
if (n == 0 || x == 1)
return 1;
if (x != -1)
return x == 0 ? 1/x : 0;
n = -n;
}
u = n;
for(pow = 1; ; )
{
if(u & 01)
pow *= x;
if(u >>= 1)
x *= x;
else
break;
}
return(pow);
}
#ifdef KR_headers
double r_sign(a,b) real *a, *b;
#else
double r_sign(real *a, real *b)
#endif
{
double x;
x = (*a >= 0 ? *a : - *a);
return( *b >= 0 ? x : -x);
}
#ifdef KR_headers
double floor();
integer i_nint(x) real *x;
#else
#undef abs
#include "math.h"
integer i_nint(real *x)
#endif
{
return( (*x)>=0 ?
floor(*x + .5) : -floor(.5 - *x) );
}

114
codecs/lpc10/ham84.c Executable file
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@@ -0,0 +1,114 @@
/*
$Log$
Revision 1.1 2000/01/05 08:20:39 markster
Version 0.1.2 from FTP
Revision 1.2 2000/01/05 08:20:39 markster
Some OSS fixes and a few lpc changes to make it actually work
* Revision 1.1 1996/08/19 22:32:07 jaf
* Initial revision
*
*/
#ifdef P_R_O_T_O_T_Y_P_E_S
extern int ham84_(integer *input, integer *output, integer *errcnt);
#endif
/* -- translated by f2c (version 19951025).
You must link the resulting object file with the libraries:
-lf2c -lm (in that order)
*/
#include "f2c.h"
/* ***************************************************************** */
/* HAM84 Version 45G */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.1 1996/08/19 22:32:07 jaf
* Initial revision
* */
/* Revision 1.3 1996/03/21 15:26:00 jaf */
/* Put comment header in standard form. */
/* Revision 1.2 1996/03/13 22:00:13 jaf */
/* Comments added explaining that none of the local variables of this */
/* subroutine need to be saved from one invocation to the next. */
/* Revision 1.1 1996/02/07 14:47:04 jaf */
/* Initial revision */
/* ***************************************************************** */
/* Hamming 8,4 Decoder - can correct 1 out of seven bits */
/* and can detect up to two errors. */
/* Input: */
/* INPUT - Seven bit data word, 4 bits parameter and */
/* 4 bits parity information */
/* Input/Output: */
/* ERRCNT - Sums errors detected by Hamming code */
/* Output: */
/* OUTPUT - 4 corrected parameter bits */
/* This subroutine is entered with an eight bit word in INPUT. The 8th */
/* bit is parity and is stripped off. The remaining 7 bits address the */
/* hamming 8,4 table and the output OUTPUT from the table gives the 4 */
/* bits of corrected data. If bit 4 is set, no error was detected. */
/* ERRCNT is the number of errors counted. */
/* This subroutine has no local state. */
/* Subroutine */ int ham84_(integer *input, integer *output, integer *errcnt)
{
/* Initialized data */
static integer dactab[128] = { 16,0,0,3,0,5,14,7,0,9,14,11,14,13,30,14,0,
9,2,7,4,7,7,23,9,25,10,9,12,9,14,7,0,5,2,11,5,21,6,5,8,11,11,27,
12,5,14,11,2,1,18,2,12,5,2,7,12,9,2,11,28,12,12,15,0,3,3,19,4,13,
6,3,8,13,10,3,13,29,14,13,4,1,10,3,20,4,4,7,10,9,26,10,4,13,10,15,
8,1,6,3,6,5,22,6,24,8,8,11,8,13,6,15,1,17,2,1,4,1,6,15,8,1,10,15,
12,15,15,31 };
integer i__, j, parity;
/* Arguments */
/* Parameters/constants */
/* Local variables that need not be saved */
/* Determine parity of input word */
parity = *input & 255;
parity ^= parity / 16;
parity ^= parity / 4;
parity ^= parity / 2;
parity &= 1;
i__ = dactab[*input & 127];
*output = i__ & 15;
j = i__ & 16;
if (j != 0) {
/* No errors detected in seven bits */
if (parity != 0) {
++(*errcnt);
}
} else {
/* One or two errors detected */
++(*errcnt);
if (parity == 0) {
/* Two errors detected */
++(*errcnt);
*output = -1;
}
}
return 0;
} /* ham84_ */

157
codecs/lpc10/hp100.c Executable file
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/*
$Log$
Revision 1.1 2000/01/05 08:20:39 markster
Version 0.1.2 from FTP
Revision 1.2 2000/01/05 08:20:39 markster
Some OSS fixes and a few lpc changes to make it actually work
* Revision 1.2 1996/08/20 20:28:05 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_encoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_encoder_state().
*
* Revision 1.1 1996/08/19 22:32:04 jaf
* Initial revision
*
*/
#ifdef P_R_O_T_O_T_Y_P_E_S
extern int hp100_(real *speech, integer *start, integer *end,
struct lpc10_encoder_state *st);
extern int inithp100_(void);
#endif
/* -- translated by f2c (version 19951025).
You must link the resulting object file with the libraries:
-lf2c -lm (in that order)
*/
#include "f2c.h"
/* ********************************************************************* */
/* HP100 Version 55 */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.2 1996/08/20 20:28:05 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_encoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_encoder_state().
*
* Revision 1.1 1996/08/19 22:32:04 jaf
* Initial revision
* */
/* Revision 1.6 1996/03/15 16:45:25 jaf */
/* Rearranged a few comments. */
/* Revision 1.5 1996/03/14 23:20:54 jaf */
/* Added comments about when INITHP100 should be used. */
/* Revision 1.4 1996/03/14 23:08:08 jaf */
/* Added an entry named INITHP100 that initializes the local state of */
/* subroutine HP100. */
/* Revision 1.3 1996/03/14 22:09:20 jaf */
/* Comments added explaining which of the local variables of this */
/* subroutine need to be saved from one invocation to the next, and which */
/* do not. */
/* Revision 1.2 1996/02/12 15:05:54 jaf */
/* Added lots of comments explaining why I changed one line, which was a */
/* declaration with initializations. */
/* Revision 1.1 1996/02/07 14:47:12 jaf */
/* Initial revision */
/* ********************************************************************* */
/* 100 Hz High Pass Filter */
/* Jan 92 - corrected typo (1.937148 to 1.935715), */
/* rounded coefficients to 7 places, */
/* corrected and merged gain (.97466**4), */
/* merged numerator into first two sections. */
/* Input: */
/* start, end - Range of samples to filter */
/* Input/Output: */
/* speech(end) - Speech data. */
/* Indices start through end are read and modified. */
/* This subroutine maintains local state from one call to the next. If */
/* you want to switch to using a new audio stream for this filter, or */
/* reinitialize its state for any other reason, call the ENTRY */
/* INITHP100. */
/* Subroutine */ int hp100_(real *speech, integer *start, integer *end,
struct lpc10_encoder_state *st)
{
/* Temporary local copies of variables in lpc10_encoder_state.
I've only created these because it might cause the loop below
to execute a bit faster to access local variables, rather than
variables in the lpc10_encoder_state structure. It is just a
guess that it will be faster. */
real z11;
real z21;
real z12;
real z22;
/* System generated locals */
integer i__1;
/* Local variables */
integer i__;
real si, err;
/* Arguments */
/* Local variables that need not be saved */
/* Local state */
/* Parameter adjustments */
if (speech) {
--speech;
}
/* Function Body */
z11 = st->z11;
z21 = st->z21;
z12 = st->z12;
z22 = st->z22;
i__1 = *end;
for (i__ = *start; i__ <= i__1; ++i__) {
si = speech[i__];
err = si + z11 * 1.859076f - z21 * .8648249f;
si = err - z11 * 2.f + z21;
z21 = z11;
z11 = err;
err = si + z12 * 1.935715f - z22 * .9417004f;
si = err - z12 * 2.f + z22;
z22 = z12;
z12 = err;
speech[i__] = si * .902428f;
}
st->z11 = z11;
st->z21 = z21;
st->z12 = z12;
st->z22 = z22;
return 0;
} /* hp100_ */

175
codecs/lpc10/invert.c Executable file
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/*
$Log$
Revision 1.1 2000/01/05 08:20:39 markster
Version 0.1.2 from FTP
Revision 1.2 2000/01/05 08:20:39 markster
Some OSS fixes and a few lpc changes to make it actually work
* Revision 1.1 1996/08/19 22:32:00 jaf
* Initial revision
*
*/
#ifdef P_R_O_T_O_T_Y_P_E_S
extern int invert_(integer *order, real *phi, real *psi, real *rc);
#endif
/* -- translated by f2c (version 19951025).
You must link the resulting object file with the libraries:
-lf2c -lm (in that order)
*/
#include "f2c.h"
/* **************************************************************** */
/* INVERT Version 45G */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.1 1996/08/19 22:32:00 jaf
* Initial revision
* */
/* Revision 1.3 1996/03/18 20:52:47 jaf */
/* Just added a few comments about which array indices of the arguments */
/* are used, and mentioning that this subroutine has no local state. */
/* Revision 1.2 1996/03/13 16:51:32 jaf */
/* Comments added explaining that none of the local variables of this */
/* subroutine need to be saved from one invocation to the next. */
/* Eliminated a comment from the original, describing a local array X */
/* that appeared nowhere in the code. */
/* Revision 1.1 1996/02/07 14:47:20 jaf */
/* Initial revision */
/* **************************************************************** */
/* Invert a covariance matrix using Choleski decomposition method. */
/* Input: */
/* ORDER - Analysis order */
/* PHI(ORDER,ORDER) - Covariance matrix */
/* Indices (I,J) read, where ORDER .GE. I .GE. J .GE. 1.*/
/* All other indices untouched. */
/* PSI(ORDER) - Column vector to be predicted */
/* Indices 1 through ORDER read. */
/* Output: */
/* RC(ORDER) - Pseudo reflection coefficients */
/* Indices 1 through ORDER written, and then possibly read.
*/
/* Internal: */
/* V(ORDER,ORDER) - Temporary matrix */
/* Same indices written as read from PHI. */
/* Many indices may be read and written again after */
/* initially being copied from PHI, but all indices */
/* are written before being read. */
/* NOTE: Temporary matrix V is not needed and may be replaced */
/* by PHI if the original PHI values do not need to be preserved. */
/* Subroutine */ int invert_(integer *order, real *phi, real *psi, real *rc)
{
/* System generated locals */
integer phi_dim1, phi_offset, i__1, i__2, i__3;
real r__1, r__2;
/* Local variables */
real save;
integer i__, j, k;
real v[100] /* was [10][10] */;
/* Arguments */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.1 1996/08/19 22:32:00 jaf
* Initial revision
* */
/* Revision 1.3 1996/03/29 22:03:47 jaf */
/* Removed definitions for any constants that were no longer used. */
/* Revision 1.2 1996/03/26 19:34:33 jaf */
/* Added comments indicating which constants are not needed in an */
/* application that uses the LPC-10 coder. */
/* Revision 1.1 1996/02/07 14:43:51 jaf */
/* Initial revision */
/* LPC Configuration parameters: */
/* Frame size, Prediction order, Pitch period */
/* Parameters/constants */
/* Local variables that need not be saved */
/* Decompose PHI into V * D * V' where V is a triangular matrix whose */
/* main diagonal elements are all 1, V' is the transpose of V, and */
/* D is a vector. Here D(n) is stored in location V(n,n). */
/* Parameter adjustments */
--rc;
--psi;
phi_dim1 = *order;
phi_offset = phi_dim1 + 1;
phi -= phi_offset;
/* Function Body */
i__1 = *order;
for (j = 1; j <= i__1; ++j) {
i__2 = *order;
for (i__ = j; i__ <= i__2; ++i__) {
v[i__ + j * 10 - 11] = phi[i__ + j * phi_dim1];
}
i__2 = j - 1;
for (k = 1; k <= i__2; ++k) {
save = v[j + k * 10 - 11] * v[k + k * 10 - 11];
i__3 = *order;
for (i__ = j; i__ <= i__3; ++i__) {
v[i__ + j * 10 - 11] -= v[i__ + k * 10 - 11] * save;
}
}
/* Compute intermediate results, which are similar to RC's */
if ((r__1 = v[j + j * 10 - 11], abs(r__1)) < 1e-10f) {
goto L100;
}
rc[j] = psi[j];
i__2 = j - 1;
for (k = 1; k <= i__2; ++k) {
rc[j] -= rc[k] * v[j + k * 10 - 11];
}
v[j + j * 10 - 11] = 1.f / v[j + j * 10 - 11];
rc[j] *= v[j + j * 10 - 11];
/* Computing MAX */
/* Computing MIN */
r__2 = rc[j];
r__1 = min(r__2,.999f);
rc[j] = max(r__1,-.999f);
}
return 0;
/* Zero out higher order RC's if algorithm terminated early */
L100:
i__1 = *order;
for (i__ = j; i__ <= i__1; ++i__) {
rc[i__] = 0.f;
}
/* Back substitute for PC's (if needed) */
/* 110 DO J = ORDER,1,-1 */
/* PC(J) = RC(J) */
/* DO I = 1,J-1 */
/* PC(J) = PC(J) - PC(I)*V(J,I) */
/* END DO */
/* END DO */
return 0;
} /* invert_ */

133
codecs/lpc10/irc2pc.c Executable file
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/*
$Log$
Revision 1.1 2000/01/05 08:20:39 markster
Version 0.1.2 from FTP
Revision 1.2 2000/01/05 08:20:39 markster
Some OSS fixes and a few lpc changes to make it actually work
* Revision 1.1 1996/08/19 22:31:56 jaf
* Initial revision
*
*/
#ifdef P_R_O_T_O_T_Y_P_E_S
extern int irc2pc_(real *rc, real *pc, integer *order, real *gprime, real *g2pass);
#endif
/* -- translated by f2c (version 19951025).
You must link the resulting object file with the libraries:
-lf2c -lm (in that order)
*/
#include "f2c.h"
/* ***************************************************************** */
/* IRC2PC Version 48 */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.1 1996/08/19 22:31:56 jaf
* Initial revision
* */
/* Revision 1.3 1996/03/20 15:47:19 jaf */
/* Added comments about which indices of array arguments are read or */
/* written. */
/* Revision 1.2 1996/03/14 16:59:04 jaf */
/* Comments added explaining that none of the local variables of this */
/* subroutine need to be saved from one invocation to the next. */
/* Revision 1.1 1996/02/07 14:47:27 jaf */
/* Initial revision */
/* ***************************************************************** */
/* Convert Reflection Coefficients to Predictor Coeficients */
/* Inputs: */
/* RC - Reflection coefficients */
/* Indices 1 through ORDER read. */
/* ORDER - Number of RC's */
/* GPRIME - Excitation modification gain */
/* Outputs: */
/* PC - Predictor coefficients */
/* Indices 1 through ORDER written. */
/* Indices 1 through ORDER-1 are read after being written. */
/* G2PASS - Excitation modification sharpening factor */
/* This subroutine has no local state. */
/* Subroutine */ int irc2pc_(real *rc, real *pc, integer *order, real *gprime,
real *g2pass)
{
/* System generated locals */
integer i__1, i__2;
/* Builtin functions */
double sqrt(doublereal);
/* Local variables */
real temp[10];
integer i__, j;
/* Arguments */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.1 1996/08/19 22:31:56 jaf
* Initial revision
* */
/* Revision 1.3 1996/03/29 22:03:47 jaf */
/* Removed definitions for any constants that were no longer used. */
/* Revision 1.2 1996/03/26 19:34:33 jaf */
/* Added comments indicating which constants are not needed in an */
/* application that uses the LPC-10 coder. */
/* Revision 1.1 1996/02/07 14:43:51 jaf */
/* Initial revision */
/* LPC Configuration parameters: */
/* Frame size, Prediction order, Pitch period */
/* Local variables that need not be saved */
/* Parameter adjustments */
--pc;
--rc;
/* Function Body */
*g2pass = 1.f;
i__1 = *order;
for (i__ = 1; i__ <= i__1; ++i__) {
*g2pass *= 1.f - rc[i__] * rc[i__];
}
*g2pass = *gprime * sqrt(*g2pass);
pc[1] = rc[1];
i__1 = *order;
for (i__ = 2; i__ <= i__1; ++i__) {
i__2 = i__ - 1;
for (j = 1; j <= i__2; ++j) {
temp[j - 1] = pc[j] - rc[i__] * pc[i__ - j];
}
i__2 = i__ - 1;
for (j = 1; j <= i__2; ++j) {
pc[j] = temp[j - 1];
}
pc[i__] = rc[i__];
}
return 0;
} /* irc2pc_ */

118
codecs/lpc10/ivfilt.c Executable file
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/*
$Log$
Revision 1.1 2000/01/05 08:20:39 markster
Version 0.1.2 from FTP
Revision 1.2 2000/01/05 08:20:39 markster
Some OSS fixes and a few lpc changes to make it actually work
* Revision 1.1 1996/08/19 22:31:53 jaf
* Initial revision
*
*/
#ifdef P_R_O_T_O_T_Y_P_E_S
extern int ivfilt_(real *lpbuf, real *ivbuf, integer *len, integer *nsamp, real *ivrc);
#endif
/* -- translated by f2c (version 19951025).
You must link the resulting object file with the libraries:
-lf2c -lm (in that order)
*/
#include "f2c.h"
/* ********************************************************************* */
/* IVFILT Version 48 */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.1 1996/08/19 22:31:53 jaf
* Initial revision
* */
/* Revision 1.3 1996/03/15 21:36:29 jaf */
/* Just added a few comments about which array indices of the arguments */
/* are used, and mentioning that this subroutine has no local state. */
/* Revision 1.2 1996/03/13 00:01:00 jaf */
/* Comments added explaining that none of the local variables of this */
/* subroutine need to be saved from one invocation to the next. */
/* Revision 1.1 1996/02/07 14:47:34 jaf */
/* Initial revision */
/* ********************************************************************* */
/* 2nd order inverse filter, speech is decimated 4:1 */
/* Input: */
/* LEN - Length of speech buffers */
/* NSAMP - Number of samples to filter */
/* LPBUF - Low pass filtered speech buffer */
/* Indices LEN-NSAMP-7 through LEN read. */
/* Output: */
/* IVBUF - Inverse filtered speech buffer */
/* Indices LEN-NSAMP+1 through LEN written. */
/* IVRC - Inverse filter reflection coefficients (for voicing) */
/* Indices 1 and 2 both written (also read, but only after writing).
*/
/* This subroutine has no local state. */
/* Subroutine */ int ivfilt_(real *lpbuf, real *ivbuf, integer *len, integer *
nsamp, real *ivrc)
{
/* System generated locals */
integer i__1;
/* Local variables */
integer i__, j, k;
real r__[3], pc1, pc2;
/* Arguments */
/* Local variables that need not be saved */
/* Local state */
/* None */
/* Calculate Autocorrelations */
/* Parameter adjustments */
--ivbuf;
--lpbuf;
--ivrc;
/* Function Body */
for (i__ = 1; i__ <= 3; ++i__) {
r__[i__ - 1] = 0.f;
k = i__ - 1 << 2;
i__1 = *len;
for (j = (i__ << 2) + *len - *nsamp; j <= i__1; j += 2) {
r__[i__ - 1] += lpbuf[j] * lpbuf[j - k];
}
}
/* Calculate predictor coefficients */
pc1 = 0.f;
pc2 = 0.f;
ivrc[1] = 0.f;
ivrc[2] = 0.f;
if (r__[0] > 1e-10f) {
ivrc[1] = r__[1] / r__[0];
ivrc[2] = (r__[2] - ivrc[1] * r__[1]) / (r__[0] - ivrc[1] * r__[1]);
pc1 = ivrc[1] - ivrc[1] * ivrc[2];
pc2 = ivrc[2];
}
/* Inverse filter LPBUF into IVBUF */
i__1 = *len;
for (i__ = *len + 1 - *nsamp; i__ <= i__1; ++i__) {
ivbuf[i__] = lpbuf[i__] - pc1 * lpbuf[i__ - 4] - pc2 * lpbuf[i__ - 8];
}
return 0;
} /* ivfilt_ */

273
codecs/lpc10/lpcdec.c Executable file
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/*
$Log$
Revision 1.1 2000/01/05 08:20:39 markster
Version 0.1.2 from FTP
Revision 1.2 2000/01/05 08:20:39 markster
Some OSS fixes and a few lpc changes to make it actually work
* Revision 1.2 1996/08/20 20:30:11 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_encoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_encoder_state().
*
* Changed name of function from lpcenc_ to lpc10_encode, simply to make
* all lpc10 functions have more consistent naming with each other.
*
* Revision 1.1 1996/08/19 22:31:48 jaf
* Initial revision
*
*/
#ifdef P_R_O_T_O_T_Y_P_E_S
extern int lpcdec_(integer *bits, real *speech);
extern int initlpcdec_(void);
/* comlen contrl_ 12 */
/*:ref: chanrd_ 14 5 4 4 4 4 4 */
/*:ref: decode_ 14 7 4 4 4 4 4 6 6 */
/*:ref: synths_ 14 6 4 4 6 6 6 4 */
/*:ref: initdecode_ 14 0 */
/*:ref: initsynths_ 14 0 */
#endif
/* -- translated by f2c (version 19951025).
You must link the resulting object file with the libraries:
-lf2c -lm (in that order)
*/
#include "f2c.h"
/* Common Block Declarations */
extern struct {
integer order, lframe;
logical corrp;
} contrl_;
#define contrl_1 contrl_
/* Table of constant values */
static integer c__10 = 10;
/* ***************************************************************** */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.2 1996/08/20 20:30:11 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_encoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_encoder_state().
*
* Changed name of function from lpcenc_ to lpc10_encode, simply to make
* all lpc10 functions have more consistent naming with each other.
*
* Revision 1.1 1996/08/19 22:31:48 jaf
* Initial revision
* */
/* Revision 1.1 1996/03/28 00:03:00 jaf */
/* Initial revision */
/* ***************************************************************** */
/* Decode 54 bits to one frame of 180 speech samples. */
/* Input: */
/* BITS - 54 encoded bits, stored 1 per array element. */
/* Indices 1 through 53 read (SYNC bit ignored). */
/* Output: */
/* SPEECH - Speech encoded as real values in the range [-1,+1]. */
/* Indices 1 through 180 written. */
/* This subroutine maintains local state from one call to the next. If */
/* you want to switch to using a new audio stream for this filter, or */
/* reinitialize its state for any other reason, call the ENTRY */
/* INITLPCDEC. */
/* Subroutine */ int lpc10_decode(integer *bits, real *speech,
struct lpc10_decoder_state *st)
{
integer irms, voice[2], pitch, ipitv;
extern /* Subroutine */ int decode_(integer *, integer *, integer *,
integer *, integer *, real *, real *, struct lpc10_decoder_state *);
real rc[10];
extern /* Subroutine */ int chanrd_(integer *, integer *, integer *,
integer *, integer *), synths_(integer *,
integer *, real *, real *, real *, integer *,
struct lpc10_decoder_state *);
integer irc[10], len;
real rms;
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.2 1996/08/20 20:30:11 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_encoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_encoder_state().
*
* Changed name of function from lpcenc_ to lpc10_encode, simply to make
* all lpc10 functions have more consistent naming with each other.
*
* Revision 1.1 1996/08/19 22:31:48 jaf
* Initial revision
* */
/* Revision 1.3 1996/03/29 22:03:47 jaf */
/* Removed definitions for any constants that were no longer used. */
/* Revision 1.2 1996/03/26 19:34:33 jaf */
/* Added comments indicating which constants are not needed in an */
/* application that uses the LPC-10 coder. */
/* Revision 1.1 1996/02/07 14:43:51 jaf */
/* Initial revision */
/* LPC Configuration parameters: */
/* Frame size, Prediction order, Pitch period */
/* Arguments */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.2 1996/08/20 20:30:11 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_encoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_encoder_state().
*
* Changed name of function from lpcenc_ to lpc10_encode, simply to make
* all lpc10 functions have more consistent naming with each other.
*
* Revision 1.1 1996/08/19 22:31:48 jaf
* Initial revision
* */
/* Revision 1.3 1996/03/29 22:05:55 jaf */
/* Commented out the common block variables that are not needed by the */
/* embedded version. */
/* Revision 1.2 1996/03/26 19:34:50 jaf */
/* Added comments indicating which constants are not needed in an */
/* application that uses the LPC-10 coder. */
/* Revision 1.1 1996/02/07 14:44:09 jaf */
/* Initial revision */
/* LPC Processing control variables: */
/* *** Read-only: initialized in setup */
/* Files for Speech, Parameter, and Bitstream Input & Output, */
/* and message and debug outputs. */
/* Here are the only files which use these variables: */
/* lpcsim.f setup.f trans.f error.f vqsetup.f */
/* Many files which use fdebug are not listed, since it is only used in */
/* those other files conditionally, to print trace statements. */
/* integer fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
/* LPC order, Frame size, Quantization rate, Bits per frame, */
/* Error correction */
/* Subroutine SETUP is the only place where order is assigned a value, */
/* and that value is 10. It could increase efficiency 1% or so to */
/* declare order as a constant (i.e., a Fortran PARAMETER) instead of as
*/
/* a variable in a COMMON block, since it is used in many places in the */
/* core of the coding and decoding routines. Actually, I take that back.
*/
/* At least when compiling with f2c, the upper bound of DO loops is */
/* stored in a local variable before the DO loop begins, and then that is
*/
/* compared against on each iteration. */
/* Similarly for lframe, which is given a value of MAXFRM in SETUP. */
/* Similarly for quant, which is given a value of 2400 in SETUP. quant */
/* is used in only a few places, and never in the core coding and */
/* decoding routines, so it could be eliminated entirely. */
/* nbits is similar to quant, and is given a value of 54 in SETUP. */
/* corrp is given a value of .TRUE. in SETUP, and is only used in the */
/* subroutines ENCODE and DECODE. It doesn't affect the speed of the */
/* coder significantly whether it is .TRUE. or .FALSE., or whether it is
*/
/* a constant or a variable, since it is only examined once per frame. */
/* Leaving it as a variable that is set to .TRUE. seems like a good */
/* idea, since it does enable some error-correction capability for */
/* unvoiced frames, with no change in the coding rate, and no noticeable
*/
/* quality difference in the decoded speech. */
/* integer quant, nbits */
/* *** Read/write: variables for debugging, not needed for LPC algorithm
*/
/* Current frame, Unstable frames, Output clip count, Max onset buffer,
*/
/* Debug listing detail level, Line count on listing page */
/* nframe is not needed for an embedded LPC10 at all. */
/* nunsfm is initialized to 0 in SETUP, and incremented in subroutine */
/* ERROR, which is only called from RCCHK. When LPC10 is embedded into */
/* an application, I would recommend removing the call to ERROR in RCCHK,
*/
/* and remove ERROR and nunsfm completely. */
/* iclip is initialized to 0 in SETUP, and incremented in entry SWRITE in
*/
/* sread.f. When LPC10 is embedded into an application, one might want */
/* to cause it to be incremented in a routine that takes the output of */
/* SYNTHS and sends it to an audio device. It could be optionally */
/* displayed, for those that might want to know what it is. */
/* maxosp is never initialized to 0 in SETUP, although it probably should
*/
/* be, and it is updated in subroutine ANALYS. I doubt that its value */
/* would be of much interest to an application in which LPC10 is */
/* embedded. */
/* listl and lincnt are not needed for an embedded LPC10 at all. */
/* integer nframe, nunsfm, iclip, maxosp, listl, lincnt */
/* common /contrl/ fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
/* common /contrl/ quant, nbits */
/* common /contrl/ nframe, nunsfm, iclip, maxosp, listl, lincnt */
/* Local variables that need not be saved */
/* Uncoded speech parameters */
/* Coded speech parameters */
/* Others */
/* Local state */
/* None */
/* Parameter adjustments */
if (bits) {
--bits;
}
if (speech) {
--speech;
}
/* Function Body */
chanrd_(&c__10, &ipitv, &irms, irc, &bits[1]);
decode_(&ipitv, &irms, irc, voice, &pitch, &rms, rc, st);
synths_(voice, &pitch, &rms, rc, &speech[1], &len, st);
return 0;
} /* lpcdec_ */

163
codecs/lpc10/lpcenc.c Executable file
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/*
$Log$
Revision 1.1 2000/01/05 08:20:39 markster
Version 0.1.2 from FTP
Revision 1.2 2000/01/05 08:20:39 markster
Some OSS fixes and a few lpc changes to make it actually work
* Revision 1.2 1996/08/20 20:31:21 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_encoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_encoder_state().
*
* Changed name of function from lpcenc_ to lpc10_encode, simply to make
* all lpc10 functions have more consistent naming with each other.
*
* Revision 1.1 1996/08/19 22:31:44 jaf
* Initial revision
*
*/
#ifdef P_R_O_T_O_T_Y_P_E_S
extern int lpcenc_(real *speech, integer *bits);
extern int initlpcenc_(void);
/*:ref: prepro_ 14 2 6 4 */
/*:ref: analys_ 14 5 6 4 4 6 6 */
/*:ref: encode_ 14 7 4 4 6 6 4 4 4 */
/*:ref: chanwr_ 14 5 4 4 4 4 4 */
/*:ref: initprepro_ 14 0 */
/*:ref: initanalys_ 14 0 */
#endif
/* -- translated by f2c (version 19951025).
You must link the resulting object file with the libraries:
-lf2c -lm (in that order)
*/
#include "f2c.h"
/* Table of constant values */
static integer c__180 = 180;
static integer c__10 = 10;
/* ***************************************************************** */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.2 1996/08/20 20:31:21 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_encoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_encoder_state().
*
* Changed name of function from lpcenc_ to lpc10_encode, simply to make
* all lpc10 functions have more consistent naming with each other.
*
* Revision 1.1 1996/08/19 22:31:44 jaf
* Initial revision
* */
/* Revision 1.2 1996/03/28 00:01:22 jaf */
/* Commented out some trace statements. */
/* Revision 1.1 1996/03/28 00:00:27 jaf */
/* Initial revision */
/* ***************************************************************** */
/* Encode one frame of 180 speech samples to 54 bits. */
/* Input: */
/* SPEECH - Speech encoded as real values in the range [-1,+1]. */
/* Indices 1 through 180 read, and modified (by PREPRO). */
/* Output: */
/* BITS - 54 encoded bits, stored 1 per array element. */
/* Indices 1 through 54 written. */
/* This subroutine maintains local state from one call to the next. If */
/* you want to switch to using a new audio stream for this filter, or */
/* reinitialize its state for any other reason, call the ENTRY */
/* INITLPCENC. */
/* Subroutine */ int lpc10_encode(real *speech, integer *bits,
struct lpc10_encoder_state *st)
{
integer irms, voice[2], pitch, ipitv;
real rc[10];
extern /* Subroutine */ int encode_(integer *, integer *, real *, real *,
integer *, integer *, integer *), chanwr_(integer *, integer *,
integer *, integer *, integer *, struct lpc10_encoder_state *),
analys_(real *, integer *,
integer *, real *, real *, struct lpc10_encoder_state *),
prepro_(real *, integer *, struct lpc10_encoder_state *);
integer irc[10];
real rms;
/* Arguments */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.2 1996/08/20 20:31:21 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_encoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_encoder_state().
*
* Changed name of function from lpcenc_ to lpc10_encode, simply to make
* all lpc10 functions have more consistent naming with each other.
*
* Revision 1.1 1996/08/19 22:31:44 jaf
* Initial revision
* */
/* Revision 1.3 1996/03/29 22:03:47 jaf */
/* Removed definitions for any constants that were no longer used. */
/* Revision 1.2 1996/03/26 19:34:33 jaf */
/* Added comments indicating which constants are not needed in an */
/* application that uses the LPC-10 coder. */
/* Revision 1.1 1996/02/07 14:43:51 jaf */
/* Initial revision */
/* LPC Configuration parameters: */
/* Frame size, Prediction order, Pitch period */
/* Local variables that need not be saved */
/* Uncoded speech parameters */
/* Coded speech parameters */
/* Local state */
/* None */
/* Parameter adjustments */
if (speech) {
--speech;
}
if (bits) {
--bits;
}
/* Function Body */
prepro_(&speech[1], &c__180, st);
analys_(&speech[1], voice, &pitch, &rms, rc, st);
encode_(voice, &pitch, &rms, rc, &ipitv, &irms, irc);
chanwr_(&c__10, &ipitv, &irms, irc, &bits[1], st);
return 0;
} /* lpcenc_ */

399
codecs/lpc10/lpcini.c Executable file
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/*
$Log$
Revision 1.1 2000/01/05 08:20:39 markster
Version 0.1.2 from FTP
Revision 1.2 2000/01/05 08:20:39 markster
Some OSS fixes and a few lpc changes to make it actually work
* Revision 1.2 1996/08/20 20:35:41 jaf
* Added functions for allocating and initializing lpc10_encoder_state
* and lpc10_decoder_state structures.
*
* Revision 1.1 1996/08/19 22:31:40 jaf
* Initial revision
*
*/
#ifdef P_R_O_T_O_T_Y_P_E_S
extern int lpcini_(void);
/* comlen contrl_ 12 */
/*:ref: initlpcenc_ 14 0 */
/*:ref: initlpcdec_ 14 0 */
#endif
/* -- translated by f2c (version 19951025).
You must link the resulting object file with the libraries:
-lf2c -lm (in that order)
*/
#include "f2c.h"
#include <malloc.h>
/* Common Block Declarations */
struct {
integer order, lframe;
logical corrp;
} contrl_;
#define contrl_1 contrl_
/* ***************************************************************** */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.2 1996/08/20 20:35:41 jaf
* Added functions for allocating and initializing lpc10_encoder_state
* and lpc10_decoder_state structures.
*
* Revision 1.1 1996/08/19 22:31:40 jaf
* Initial revision
* */
/* Revision 1.1 1996/03/28 00:04:05 jaf */
/* Initial revision */
/* ***************************************************************** */
/* Initialize COMMON block variables used by LPC-10 encoder and decoder, */
/* and call initialization routines for both of them. */
/* Subroutine */ int lpcini_(void)
{
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.2 1996/08/20 20:35:41 jaf
* Added functions for allocating and initializing lpc10_encoder_state
* and lpc10_decoder_state structures.
*
* Revision 1.1 1996/08/19 22:31:40 jaf
* Initial revision
* */
/* Revision 1.3 1996/03/29 22:03:47 jaf */
/* Removed definitions for any constants that were no longer used. */
/* Revision 1.2 1996/03/26 19:34:33 jaf */
/* Added comments indicating which constants are not needed in an */
/* application that uses the LPC-10 coder. */
/* Revision 1.1 1996/02/07 14:43:51 jaf */
/* Initial revision */
/* LPC Configuration parameters: */
/* Frame size, Prediction order, Pitch period */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.2 1996/08/20 20:35:41 jaf
* Added functions for allocating and initializing lpc10_encoder_state
* and lpc10_decoder_state structures.
*
* Revision 1.1 1996/08/19 22:31:40 jaf
* Initial revision
* */
/* Revision 1.3 1996/03/29 22:05:55 jaf */
/* Commented out the common block variables that are not needed by the */
/* embedded version. */
/* Revision 1.2 1996/03/26 19:34:50 jaf */
/* Added comments indicating which constants are not needed in an */
/* application that uses the LPC-10 coder. */
/* Revision 1.1 1996/02/07 14:44:09 jaf */
/* Initial revision */
/* LPC Processing control variables: */
/* *** Read-only: initialized in setup */
/* Files for Speech, Parameter, and Bitstream Input & Output, */
/* and message and debug outputs. */
/* Here are the only files which use these variables: */
/* lpcsim.f setup.f trans.f error.f vqsetup.f */
/* Many files which use fdebug are not listed, since it is only used in */
/* those other files conditionally, to print trace statements. */
/* integer fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
/* LPC order, Frame size, Quantization rate, Bits per frame, */
/* Error correction */
/* Subroutine SETUP is the only place where order is assigned a value, */
/* and that value is 10. It could increase efficiency 1% or so to */
/* declare order as a constant (i.e., a Fortran PARAMETER) instead of as
*/
/* a variable in a COMMON block, since it is used in many places in the */
/* core of the coding and decoding routines. Actually, I take that back.
*/
/* At least when compiling with f2c, the upper bound of DO loops is */
/* stored in a local variable before the DO loop begins, and then that is
*/
/* compared against on each iteration. */
/* Similarly for lframe, which is given a value of MAXFRM in SETUP. */
/* Similarly for quant, which is given a value of 2400 in SETUP. quant */
/* is used in only a few places, and never in the core coding and */
/* decoding routines, so it could be eliminated entirely. */
/* nbits is similar to quant, and is given a value of 54 in SETUP. */
/* corrp is given a value of .TRUE. in SETUP, and is only used in the */
/* subroutines ENCODE and DECODE. It doesn't affect the speed of the */
/* coder significantly whether it is .TRUE. or .FALSE., or whether it is
*/
/* a constant or a variable, since it is only examined once per frame. */
/* Leaving it as a variable that is set to .TRUE. seems like a good */
/* idea, since it does enable some error-correction capability for */
/* unvoiced frames, with no change in the coding rate, and no noticeable
*/
/* quality difference in the decoded speech. */
/* integer quant, nbits */
/* *** Read/write: variables for debugging, not needed for LPC algorithm
*/
/* Current frame, Unstable frames, Output clip count, Max onset buffer,
*/
/* Debug listing detail level, Line count on listing page */
/* nframe is not needed for an embedded LPC10 at all. */
/* nunsfm is initialized to 0 in SETUP, and incremented in subroutine */
/* ERROR, which is only called from RCCHK. When LPC10 is embedded into */
/* an application, I would recommend removing the call to ERROR in RCCHK,
*/
/* and remove ERROR and nunsfm completely. */
/* iclip is initialized to 0 in SETUP, and incremented in entry SWRITE in
*/
/* sread.f. When LPC10 is embedded into an application, one might want */
/* to cause it to be incremented in a routine that takes the output of */
/* SYNTHS and sends it to an audio device. It could be optionally */
/* displayed, for those that might want to know what it is. */
/* maxosp is never initialized to 0 in SETUP, although it probably should
*/
/* be, and it is updated in subroutine ANALYS. I doubt that its value */
/* would be of much interest to an application in which LPC10 is */
/* embedded. */
/* listl and lincnt are not needed for an embedded LPC10 at all. */
/* integer nframe, nunsfm, iclip, maxosp, listl, lincnt */
/* common /contrl/ fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
/* common /contrl/ quant, nbits */
/* common /contrl/ nframe, nunsfm, iclip, maxosp, listl, lincnt */
contrl_1.order = 10;
contrl_1.lframe = 180;
contrl_1.corrp = TRUE_;
return 0;
} /* lpcini_ */
/* Allocate memory for, and initialize, the state that needs to be
kept from encoding one frame to the next for a single
LPC-10-compressed audio stream. Return 0 if malloc fails,
otherwise return pointer to new structure. */
struct lpc10_encoder_state *
create_lpc10_encoder_state()
{
struct lpc10_encoder_state *st;
st = (struct lpc10_encoder_state *)
malloc((unsigned) sizeof (struct lpc10_encoder_state));
if (st != 0) {
init_lpc10_encoder_state(st);
}
return (st);
}
void init_lpc10_encoder_state(struct lpc10_encoder_state *st)
{
int i;
lpcini_();
/* State used only by function hp100 */
st->z11 = 0.0f;
st->z21 = 0.0f;
st->z12 = 0.0f;
st->z22 = 0.0f;
/* State used by function analys */
for (i = 0; i < 540; i++) {
st->inbuf[i] = 0.0f;
st->pebuf[i] = 0.0f;
}
for (i = 0; i < 696; i++) {
st->lpbuf[i] = 0.0f;
}
for (i = 0; i < 312; i++) {
st->ivbuf[i] = 0.0f;
}
st->bias = 0.0f;
/* integer osbuf[10]; /* no initial value necessary */
st->osptr = 1;
for (i = 0; i < 3; i++) {
st->obound[i] = 0;
}
st->vwin[4] = 307;
st->vwin[5] = 462;
st->awin[4] = 307;
st->awin[5] = 462;
for (i = 0; i < 8; i++) {
st->voibuf[i] = 0;
}
for (i = 0; i < 3; i++) {
st->rmsbuf[i] = 0.0f;
}
for (i = 0; i < 30; i++) {
st->rcbuf[i] = 0.0f;
}
st->zpre = 0.0f;
/* State used by function onset */
st->n = 0.0f;
st->d__ = 1.0f;
/* real fpc; /* no initial value necessary */
for (i = 0; i < 16; i++) {
st->l2buf[i] = 0.0f;
}
st->l2sum1 = 0.0f;
st->l2ptr1 = 1;
st->l2ptr2 = 9;
/* integer lasti; /* no initial value necessary */
st->hyst = FALSE_;
/* State used by function voicin */
st->dither = 20.0f;
st->maxmin = 0.0f;
for (i = 0; i < 6; i++) {
st->voice[i] = 0.0f;
}
st->lbve = 3000;
st->fbve = 3000;
st->fbue = 187;
st->ofbue = 187;
st->sfbue = 187;
st->lbue = 93;
st->olbue = 93;
st->slbue = 93;
st->snr = (real) (st->fbve / st->fbue << 6);
/* State used by function dyptrk */
for (i = 0; i < 60; i++) {
st->s[i] = 0.0f;
}
for (i = 0; i < 120; i++) {
st->p[i] = 0;
}
st->ipoint = 0;
st->alphax = 0.0f;
/* State used by function chanwr */
st->isync = 0;
}
/* Allocate memory for, and initialize, the state that needs to be
kept from decoding one frame to the next for a single
LPC-10-compressed audio stream. Return 0 if malloc fails,
otherwise return pointer to new structure. */
struct lpc10_decoder_state *
create_lpc10_decoder_state()
{
struct lpc10_decoder_state *st;
st = (struct lpc10_decoder_state *)
malloc((unsigned) sizeof (struct lpc10_decoder_state));
if (st != 0) {
init_lpc10_decoder_state(st);
}
return (st);
}
void init_lpc10_decoder_state(struct lpc10_decoder_state *st)
{
int i;
lpcini_();
/* State used by function decode */
st->iptold = 60;
st->first = TRUE_;
st->ivp2h = 0;
st->iovoic = 0;
st->iavgp = 60;
st->erate = 0;
for (i = 0; i < 30; i++) {
st->drc[i] = 0;
}
for (i = 0; i < 3; i++) {
st->dpit[i] = 0;
st->drms[i] = 0;
}
/* State used by function synths */
for (i = 0; i < 360; i++) {
st->buf[i] = 0.0f;
}
st->buflen = 180;
/* State used by function pitsyn */
/* ivoico; /* no initial value necessary as long as first_pitsyn is initially TRUE_ */
/* ipito; /* no initial value necessary as long as first_pitsyn is initially TRUE_ */
st->rmso = 1.0f;
/* rco[10]; /* no initial value necessary as long as first_pitsyn is initially TRUE_ */
/* integer jsamp; /* no initial value necessary as long as first_pitsyn is initially TRUE_ */
st->first_pitsyn = TRUE_;
/* State used by function bsynz */
st->ipo = 0;
for (i = 0; i < 166; i++) {
st->exc[i] = 0.0f;
st->exc2[i] = 0.0f;
}
st->lpi1 = 0.0f;
st->lpi2 = 0.0f;
st->lpi3 = 0.0f;
st->hpi1 = 0.0f;
st->hpi2 = 0.0f;
st->hpi3 = 0.0f;
st->rmso_bsynz = 0.0f;
/* State used by function random */
st->j = 2;
st->k = 5;
st->y[0] = (shortint) -21161;
st->y[1] = (shortint) -8478;
st->y[2] = (shortint) 30892;
st->y[3] = (shortint) -10216;
st->y[4] = (shortint) 16950;
/* State used by function deemp */
st->dei1 = 0.0f;
st->dei2 = 0.0f;
st->deo1 = 0.0f;
st->deo2 = 0.0f;
st->deo3 = 0.0f;
}

113
codecs/lpc10/lpfilt.c Executable file
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/*
$Log$
Revision 1.1 2000/01/05 08:20:39 markster
Version 0.1.2 from FTP
Revision 1.2 2000/01/05 08:20:39 markster
Some OSS fixes and a few lpc changes to make it actually work
* Revision 1.1 1996/08/19 22:31:35 jaf
* Initial revision
*
*/
#ifdef P_R_O_T_O_T_Y_P_E_S
extern int lpfilt_(real *inbuf, real *lpbuf, integer *len, integer *nsamp);
#endif
/* -- translated by f2c (version 19951025).
You must link the resulting object file with the libraries:
-lf2c -lm (in that order)
*/
#include "f2c.h"
/* *********************************************************************** */
/* LPFILT Version 55 */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.1 1996/08/19 22:31:35 jaf
* Initial revision
* */
/* Revision 1.3 1996/03/15 16:53:49 jaf */
/* Just put comment header in standard form. */
/* Revision 1.2 1996/03/12 23:58:06 jaf */
/* Comments added explaining that none of the local variables of this */
/* subroutine need to be saved from one invocation to the next. */
/* Revision 1.1 1996/02/07 14:47:44 jaf */
/* Initial revision */
/* *********************************************************************** */
/* 31 Point Equiripple FIR Low-Pass Filter */
/* Linear phase, delay = 15 samples */
/* Passband: ripple = 0.25 dB, cutoff = 800 Hz */
/* Stopband: atten. = 40. dB, cutoff = 1240 Hz */
/* Inputs: */
/* LEN - Length of speech buffers */
/* NSAMP - Number of samples to filter */
/* INBUF - Input speech buffer */
/* Indices len-nsamp-29 through len are read. */
/* Output: */
/* LPBUF - Low passed speech buffer (must be different array than INBUF) */
/* Indices len+1-nsamp through len are written. */
/* This subroutine has no local state. */
/* Subroutine */ int lpfilt_(real *inbuf, real *lpbuf, integer *len, integer *
nsamp)
{
/* System generated locals */
integer i__1;
/* Local variables */
integer j;
real t;
/* Arguments */
/* Parameters/constants */
/* Local variables that need not be saved */
/* Local state */
/* None */
/* Parameter adjustments */
--lpbuf;
--inbuf;
/* Function Body */
i__1 = *len;
for (j = *len + 1 - *nsamp; j <= i__1; ++j) {
t = (inbuf[j] + inbuf[j - 30]) * -.0097201988f;
t += (inbuf[j - 1] + inbuf[j - 29]) * -.0105179986f;
t += (inbuf[j - 2] + inbuf[j - 28]) * -.0083479648f;
t += (inbuf[j - 3] + inbuf[j - 27]) * 5.860774e-4f;
t += (inbuf[j - 4] + inbuf[j - 26]) * .0130892089f;
t += (inbuf[j - 5] + inbuf[j - 25]) * .0217052232f;
t += (inbuf[j - 6] + inbuf[j - 24]) * .0184161253f;
t += (inbuf[j - 7] + inbuf[j - 23]) * 3.39723e-4f;
t += (inbuf[j - 8] + inbuf[j - 22]) * -.0260797087f;
t += (inbuf[j - 9] + inbuf[j - 21]) * -.0455563702f;
t += (inbuf[j - 10] + inbuf[j - 20]) * -.040306855f;
t += (inbuf[j - 11] + inbuf[j - 19]) * 5.029835e-4f;
t += (inbuf[j - 12] + inbuf[j - 18]) * .0729262903f;
t += (inbuf[j - 13] + inbuf[j - 17]) * .1572008878f;
t += (inbuf[j - 14] + inbuf[j - 16]) * .2247288674f;
t += inbuf[j - 15] * .250535965f;
lpbuf[j] = t;
}
return 0;
} /* lpfilt_ */

77
codecs/lpc10/median.c Executable file
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/*
$Log$
Revision 1.1 2000/01/05 08:20:39 markster
Version 0.1.2 from FTP
Revision 1.2 2000/01/05 08:20:39 markster
Some OSS fixes and a few lpc changes to make it actually work
* Revision 1.1 1996/08/19 22:31:31 jaf
* Initial revision
*
*/
#ifdef P_R_O_T_O_T_Y_P_E_S
extern integer median_(integer *d1, integer *d2, integer *d3);
#endif
/* -- translated by f2c (version 19951025).
You must link the resulting object file with the libraries:
-lf2c -lm (in that order)
*/
#include "f2c.h"
/* ********************************************************************* */
/* MEDIAN Version 45G */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.1 1996/08/19 22:31:31 jaf
* Initial revision
* */
/* Revision 1.2 1996/03/14 22:30:22 jaf */
/* Just rearranged the comments and local variable declarations a bit. */
/* Revision 1.1 1996/02/07 14:47:53 jaf */
/* Initial revision */
/* ********************************************************************* */
/* Find median of three values */
/* Input: */
/* D1,D2,D3 - Three input values */
/* Output: */
/* MEDIAN - Median value */
integer median_(integer *d1, integer *d2, integer *d3)
{
/* System generated locals */
integer ret_val;
/* Arguments */
ret_val = *d2;
if (*d2 > *d1 && *d2 > *d3) {
ret_val = *d1;
if (*d3 > *d1) {
ret_val = *d3;
}
} else if (*d2 < *d1 && *d2 < *d3) {
ret_val = *d1;
if (*d3 < *d1) {
ret_val = *d3;
}
}
return ret_val;
} /* median_ */

151
codecs/lpc10/mload.c Executable file
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/*
$Log$
Revision 1.1 2000/01/05 08:20:39 markster
Version 0.1.2 from FTP
Revision 1.2 2000/01/05 08:20:39 markster
Some OSS fixes and a few lpc changes to make it actually work
* Revision 1.1 1996/08/19 22:31:25 jaf
* Initial revision
*
*/
#ifdef P_R_O_T_O_T_Y_P_E_S
extern int mload_(integer *order, integer *awins, integer *awinf, real *speech, real *phi, real *psi);
#endif
/* -- translated by f2c (version 19951025).
You must link the resulting object file with the libraries:
-lf2c -lm (in that order)
*/
#include "f2c.h"
/* ***************************************************************** */
/* MLOAD Version 48 */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.1 1996/08/19 22:31:25 jaf
* Initial revision
* */
/* Revision 1.5 1996/03/27 23:59:51 jaf */
/* Added some more accurate comments about which indices of the argument */
/* array SPEECH are read. I thought that this might be the cause of a */
/* problem I've been having, but it isn't. */
/* Revision 1.4 1996/03/26 19:16:53 jaf */
/* Commented out the code at the end that copied the lower triangular */
/* half of PHI into the upper triangular half (making the resulting */
/* matrix symmetric). The upper triangular half was never used by later */
/* code in subroutine ANALYS. */
/* Revision 1.3 1996/03/18 21:16:00 jaf */
/* Just added a few comments about which array indices of the arguments */
/* are used, and mentioning that this subroutine has no local state. */
/* Revision 1.2 1996/03/13 16:47:41 jaf */
/* Comments added explaining that none of the local variables of this */
/* subroutine need to be saved from one invocation to the next. */
/* Revision 1.1 1996/02/07 14:48:01 jaf */
/* Initial revision */
/* ***************************************************************** */
/* Load a covariance matrix. */
/* Input: */
/* ORDER - Analysis order */
/* AWINS - Analysis window start */
/* AWINF - Analysis window finish */
/* SPEECH(AWINF) - Speech buffer */
/* Indices MIN(AWINS, AWINF-(ORDER-1)) through */
/* MAX(AWINF, AWINS+(ORDER-1)) read. */
/* As long as (AWINF-AWINS) .GE. (ORDER-1), */
/* this is just indices AWINS through AWINF. */
/* Output: */
/* PHI(ORDER,ORDER) - Covariance matrix */
/* Lower triangular half and diagonal written, and read.*/
/* Upper triangular half untouched. */
/* PSI(ORDER) - Prediction vector */
/* Indices 1 through ORDER written, */
/* and most are read after that. */
/* This subroutine has no local state. */
/* Subroutine */ int mload_(integer *order, integer *awins, integer *awinf,
real *speech, real *phi, real *psi)
{
/* System generated locals */
integer phi_dim1, phi_offset, i__1, i__2;
/* Local variables */
integer c__, i__, r__, start;
/* Arguments */
/* Local variables that need not be saved */
/* Load first column of triangular covariance matrix PHI */
/* Parameter adjustments */
--psi;
phi_dim1 = *order;
phi_offset = phi_dim1 + 1;
phi -= phi_offset;
--speech;
/* Function Body */
start = *awins + *order;
i__1 = *order;
for (r__ = 1; r__ <= i__1; ++r__) {
phi[r__ + phi_dim1] = 0.f;
i__2 = *awinf;
for (i__ = start; i__ <= i__2; ++i__) {
phi[r__ + phi_dim1] += speech[i__ - 1] * speech[i__ - r__];
}
}
/* Load last element of vector PSI */
psi[*order] = 0.f;
i__1 = *awinf;
for (i__ = start; i__ <= i__1; ++i__) {
psi[*order] += speech[i__] * speech[i__ - *order];
}
/* End correct to get additional columns of PHI */
i__1 = *order;
for (r__ = 2; r__ <= i__1; ++r__) {
i__2 = r__;
for (c__ = 2; c__ <= i__2; ++c__) {
phi[r__ + c__ * phi_dim1] = phi[r__ - 1 + (c__ - 1) * phi_dim1] -
speech[*awinf + 1 - r__] * speech[*awinf + 1 - c__] +
speech[start - r__] * speech[start - c__];
}
}
/* End correct to get additional elements of PSI */
i__1 = *order - 1;
for (c__ = 1; c__ <= i__1; ++c__) {
psi[c__] = phi[c__ + 1 + phi_dim1] - speech[start - 1] * speech[start
- 1 - c__] + speech[*awinf] * speech[*awinf - c__];
}
/* Copy lower triangular section into upper (why bother?) */
/* I'm commenting this out, since the upper triangular half of PHI
*/
/* is never used by later code, unless a sufficiently high level of
*/
/* tracing is turned on. */
/* DO R = 1,ORDER */
/* DO C = 1,R-1 */
/* PHI(C,R) = PHI(R,C) */
/* END DO */
/* END DO */
return 0;
} /* mload_ */

306
codecs/lpc10/onset.c Executable file
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@@ -0,0 +1,306 @@
/*
$Log$
Revision 1.1 2000/01/05 08:20:39 markster
Version 0.1.2 from FTP
Revision 1.2 2000/01/05 08:20:39 markster
Some OSS fixes and a few lpc changes to make it actually work
* Revision 1.2 1996/08/20 20:37:55 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_encoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_encoder_state().
*
* Revision 1.1 1996/08/19 22:31:18 jaf
* Initial revision
*
*/
#ifdef P_R_O_T_O_T_Y_P_E_S
extern int onset_(real *pebuf, integer *osbuf, integer *osptr, integer *oslen, integer *sbufl, integer *sbufh, integer *lframe, struct lpc10_encoder_state *st);
#endif
/* -- translated by f2c (version 19951025).
You must link the resulting object file with the libraries:
-lf2c -lm (in that order)
*/
#include "f2c.h"
/* Table of constant values */
static real c_b2 = 1.f;
/* ****************************************************************** */
/* ONSET Version 49 */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.2 1996/08/20 20:37:55 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_encoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_encoder_state().
*
* Revision 1.1 1996/08/19 22:31:18 jaf
* Initial revision
* */
/* Revision 1.5 1996/03/15 16:41:01 jaf */
/* Just rearranged INITONSET assignment orders to be consistent with */
/* order of DATA statements in ONSET. */
/* Revision 1.4 1996/03/15 15:48:27 jaf */
/* Changed some comments, and only reordered the DATA statements (their */
/* meaning wasn't changed). */
/* Revision 1.3 1996/03/14 23:53:06 jaf */
/* Added an entry INITONSET that reinitializes the local state variables */
/* of subroutine ONSET. */
/* Rearranged quite a few comments, adding more explaining which */
/* arguments were inputs, and how the modified ones can be changed. */
/* Revision 1.2 1996/03/12 23:53:00 jaf */
/* Lots of comments added about the local state of this subroutine that */
/* must be saved from one invocation to the next. */
/* One constant 180 replaced with LFRAME, which should be "more general", */
/* even though it would probably require many more changes than this to */
/* get this coder to work for other frame sizes. */
/* Revision 1.1 1996/02/07 14:48:09 jaf */
/* Initial revision */
/* ****************************************************************** */
/* Floating point version */
/* Detection of onsets in (or slightly preceding) the futuremost frame */
/* of speech. */
/* Input: */
/* PEBUF(SBUFL:SBUFH) - Preemphasized speech */
/* Indices SBUFH-LFRAME through SBUFH are read. */
/* OSLEN - Maximum number of onsets that can be stored in OSBUF. */
/* SBUFL, SBUFH - Range of PEBUF */
/* LFRAME - length of a frame, in samples */
/* Input/Output: */
/* OSBUF(OSLEN) - Buffer which holds sorted indexes of onsets */
/* Indices A through B are modified, where A */
/* is the original value of OSPTR, and B is the final */
/* value of OSPTR-1. B is at most OSLEN. */
/* OSPTR - Free pointer into OSBUF */
/* Initial value should be .LE. OSLEN+1. */
/* If so, final value grows by one for each new onset */
/* found, and final value will be .LE. OSLEN+1. */
/* This subroutine maintains local state from one call to the next. If */
/* you want to switch to using a new audio stream for this subroutine, or */
/* reinitialize its state for any other reason, call the ENTRY INITONSET. */
/* Subroutine */ int onset_(real *pebuf, integer *osbuf, integer *
osptr, integer *oslen, integer *sbufl, integer *sbufh, integer *
lframe, struct lpc10_encoder_state *st)
{
/* Initialized data */
real *n;
real *d__;
real *l2buf;
real *l2sum1;
integer *l2ptr1;
integer *l2ptr2;
logical *hyst;
/* System generated locals */
integer pebuf_offset, i__1;
real r__1;
/* Builtin functions */
double r_sign(real *, real *);
/* Local variables */
integer i__;
integer *lasti;
real l2sum2;
real *fpc;
/* Arguments */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.2 1996/08/20 20:37:55 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_encoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_encoder_state().
*
* Revision 1.1 1996/08/19 22:31:18 jaf
* Initial revision
* */
/* Revision 1.3 1996/03/29 22:03:47 jaf */
/* Removed definitions for any constants that were no longer used. */
/* Revision 1.2 1996/03/26 19:34:33 jaf */
/* Added comments indicating which constants are not needed in an */
/* application that uses the LPC-10 coder. */
/* Revision 1.1 1996/02/07 14:43:51 jaf */
/* Initial revision */
/* LPC Configuration parameters: */
/* Frame size, Prediction order, Pitch period */
/* Parameters/constants */
/* Parameters for onset detection algorithm: */
/* L2 Threshold for filtered slope of FPC (function of L2WID!) */
/* L2LAG Lag due to both filters which compute filtered slope of FPC */
/* L2WID Width of the filter which computes the slope of FPC */
/* OSHYST The number of samples of slope(FPC) which must be below */
/* the threshold before a new onset may be declared. */
/* Local variables that need not be saved */
/* Local state */
/* Variables */
/* N, D Numerator and denominator of prediction filters */
/* FPC Current prediction coefs */
/* L2BUF, L2SUM1, L2SUM2 State of slope filter */
/* The only "significant" change I've made is to change L2SUM2 out
*/
/* of the list of local variables that need to be saved, since it */
/* didn't need to be. */
/* L2SUM1 need not be, but avoiding saving it would require a small
*/
/* change to the body of the code. See comments below for an */
/* example of how the code could be changed to avoid saving L2SUM1.
*/
/* FPC and LASTI are saved from one invocation to the next, but */
/* they are not given initial values. This is acceptable, because
*/
/* FPC will be assigned a value the first time that this function */
/* is called after D is initialized to 1, since the formula to */
/* change D will not change it to 0 in one step, and the IF (D */
/* .NE. 0) statement will execute its THEN part, initializing FPC.
*/
/* LASTI's value will not be used until HYST is .TRUE., and */
/* whenever HYST is changed from its initial value of .FALSE., */
/* LASTI is assigned a value. */
/* In a C version of this coder, it would be nice if all of these */
/* saved things, in this and all other subroutines, could be stored
*/
/* in a single struct lpc10_coder_state_t, initialized with a call
*/
/* to a function like lpc10_init(&lpc10_coder_state). In this way,
*/
/* a program that used these functions could conveniently alternate
*/
/* coding more than one distinct audio stream. */
n = &(st->n);
d__ = &(st->d__);
fpc = &(st->fpc);
l2buf = &(st->l2buf[0]);
l2sum1 = &(st->l2sum1);
l2ptr1 = &(st->l2ptr1);
l2ptr2 = &(st->l2ptr2);
lasti = &(st->lasti);
hyst = &(st->hyst);
/* Parameter adjustments */
if (osbuf) {
--osbuf;
}
if (pebuf) {
pebuf_offset = *sbufl;
pebuf -= pebuf_offset;
}
/* Function Body */
/* The following line subtracted a hard-coded "180" from LASTI, */
/* instead of using a variable like LFRAME or a constant like */
/* MAXFRM. I changed it to LFRAME, for "generality". */
if (*hyst) {
*lasti -= *lframe;
}
i__1 = *sbufh;
for (i__ = *sbufh - *lframe + 1; i__ <= i__1; ++i__) {
/* Compute FPC; Use old FPC on divide by zero; Clamp FPC to +/- 1.
*/
*n = (pebuf[i__] * pebuf[i__ - 1] + (*n) * 63.f) / 64.f;
/* Computing 2nd power */
r__1 = pebuf[i__ - 1];
*d__ = (r__1 * r__1 + (*d__) * 63.f) / 64.f;
if ((*d__) != 0.f) {
if (abs(*n) > (*d__)) {
*fpc = r_sign(&c_b2, n);
} else {
*fpc = (*n) / (*d__);
}
}
/* Filter FPC */
/* In order to allow L2SUM1 not to be saved from one invocation
of */
/* this subroutine to the next, one could change the sequence of
*/
/* assignments below, up to the IF statement, to the following.
In */
/* addition, the initial value of L2PTR2 should be changed to */
/* L2WID/2 instead of L2WID/2+1. */
/* L2SUM1 = L2BUF(L2PTR2) */
/* L2PTR2 = MOD(L2PTR2,L2WID)+1 */
/* L2SUM1 = L2SUM1 - L2BUF(L2PTR2) + FPC */
/* L2BUF(L2PTR2) = L2SUM1 */
/* * The following lines didn't change from the original: */
/* L2SUM2 = L2BUF(L2PTR1) */
/* L2BUF(L2PTR1) = FPC */
/* L2PTR1 = MOD(L2PTR1,L2WID)+1 */
l2sum2 = l2buf[*l2ptr1 - 1];
*l2sum1 = *l2sum1 - l2buf[*l2ptr2 - 1] + *fpc;
l2buf[*l2ptr2 - 1] = *l2sum1;
l2buf[*l2ptr1 - 1] = *fpc;
*l2ptr1 = *l2ptr1 % 16 + 1;
*l2ptr2 = *l2ptr2 % 16 + 1;
if ((r__1 = *l2sum1 - l2sum2, abs(r__1)) > 1.7f) {
if (! (*hyst)) {
/* Ignore if buffer full */
if (*osptr <= *oslen) {
osbuf[*osptr] = i__ - 9;
++(*osptr);
}
*hyst = TRUE_;
}
*lasti = i__;
/* After one onset detection, at least OSHYST sample times m
ust go */
/* by before another is allowed to occur. */
} else if ((*hyst) && i__ - *lasti >= 10) {
*hyst = FALSE_;
}
}
return 0;
} /* onset_ */

556
codecs/lpc10/pitsyn.c Executable file
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@@ -0,0 +1,556 @@
/*
$Log$
Revision 1.1 2000/01/05 08:20:39 markster
Version 0.1.2 from FTP
Revision 1.2 2000/01/05 08:20:39 markster
Some OSS fixes and a few lpc changes to make it actually work
* Revision 1.2 1996/08/20 20:40:12 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_decoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_decoder_state().
*
* Revision 1.1 1996/08/19 22:31:12 jaf
* Initial revision
*
*/
#ifdef P_R_O_T_O_T_Y_P_E_S
extern int pitsyn_(integer *order, integer *voice, integer *pitch, real *rms, real *rc, integer *lframe, integer *ivuv, integer *ipiti, real *rmsi, real *rci, integer *nout, real *ratio, struct lpc10_decoder_state *st);
#endif
/* -- translated by f2c (version 19951025).
You must link the resulting object file with the libraries:
-lf2c -lm (in that order)
*/
#include "f2c.h"
/* ***************************************************************** */
/* PITSYN Version 53 */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.2 1996/08/20 20:40:12 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_decoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_decoder_state().
*
* Revision 1.1 1996/08/19 22:31:12 jaf
* Initial revision
* */
/* Revision 1.2 1996/03/25 18:49:07 jaf */
/* Added commments about which indices of array arguments are read or */
/* written. */
/* Rearranged local variable declarations to indicate which need to be */
/* saved from one invocation to the next. Added entry INITPITSYN to */
/* reinitialize local state variables, if desired. */
/* Added lots of comments about proving that the maximum number of pitch */
/* periods (NOUT) that can be returned is 16. The call to STOP that */
/* could happen if NOUT got too large was removed as a result. */
/* Also proved that the total number of samples returned from N calls, */
/* each with identical values of LFRAME, will always be in the range */
/* N*LFRAME-MAXPIT+1 to N*LFRAME. */
/* Revision 1.1 1996/02/07 14:48:18 jaf */
/* Initial revision */
/* ***************************************************************** */
/* Synthesize a single pitch epoch */
/* Input: */
/* ORDER - Synthesis order (number of RC's) */
/* VOICE - Half frame voicing decisions */
/* Indices 1 through 2 read. */
/* LFRAME - Length of speech buffer */
/* Input/Output: */
/* PITCH - Pitch */
/* This value should be in the range MINPIT (20) to MAXPIT */
/* (156), inclusive. */
/* PITCH can be modified under some conditions. */
/* RMS - Energy (can be modified) */
/* RMS is changed to 1 if the value passed in is less than 1. */
/* RC - Reflection coefficients */
/* Indices 1 through ORDER can be temporarily overwritten with */
/* RCO, and then replaced with original values, under some */
/* conditions. */
/* Output: */
/* IVUV - Pitch epoch voicing decisions */
/* Indices (I) of IVUV, IPITI, and RMSI are written, */
/* and indices (J,I) of RCI are written, */
/* where I ranges from 1 to NOUT, and J ranges from 1 to ORDER. */
/* IPITI - Pitch epoch length */
/* RMSI - Pitch epoch energy */
/* RCI - Pitch epoch RC's */
/* NOUT - Number of pitch periods in this frame */
/* This is at least 0, at least 1 if MAXPIT .LT. LFRAME (this */
/* is currently true on every call), and can never be more than */
/* (LFRAME+MAXPIT-1)/PITCH, which is currently 16 with */
/* LFRAME=180, MAXPIT=156, and PITCH .GE. 20, as SYNTHS */
/* guarantees when it calls this subroutine. */
/* RATIO - Previous to present energy ratio */
/* Always assigned a value. */
/* Subroutine */ int pitsyn_(integer *order, integer *voice,
integer *pitch, real *rms, real *rc, integer *lframe, integer *ivuv,
integer *ipiti, real *rmsi, real *rci, integer *nout, real *ratio,
struct lpc10_decoder_state *st)
{
/* Initialized data */
real *rmso;
logical *first;
/* System generated locals */
integer rci_dim1, rci_offset, i__1, i__2;
real r__1;
/* Builtin functions */
double log(doublereal), exp(doublereal);
/* Local variables */
real alrn, alro, yarc[10], prop;
integer i__, j, vflag, jused, lsamp;
integer *jsamp;
real slope;
integer *ipito;
real uvpit;
integer ip, nl, ivoice;
integer *ivoico;
integer istart;
real *rco;
real xxy;
/* Arguments */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.2 1996/08/20 20:40:12 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_decoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_decoder_state().
*
* Revision 1.1 1996/08/19 22:31:12 jaf
* Initial revision
* */
/* Revision 1.3 1996/03/29 22:03:47 jaf */
/* Removed definitions for any constants that were no longer used. */
/* Revision 1.2 1996/03/26 19:34:33 jaf */
/* Added comments indicating which constants are not needed in an */
/* application that uses the LPC-10 coder. */
/* Revision 1.1 1996/02/07 14:43:51 jaf */
/* Initial revision */
/* LPC Configuration parameters: */
/* Frame size, Prediction order, Pitch period */
/* Local variables that need not be saved */
/* LSAMP is initialized in the IF (FIRST) THEN clause, but it is */
/* not used the first time through, and it is given a value before
*/
/* use whenever FIRST is .FALSE., so it appears unnecessary to */
/* assign it a value when FIRST is .TRUE. */
/* Local state */
/* FIRST - .TRUE. only on first call to PITSYN. */
/* IVOICO - Previous VOICE(2) value. */
/* IPITO - Previous PITCH value. */
/* RMSO - Previous RMS value. */
/* RCO - Previous RC values. */
/* JSAMP - If this routine is called N times with identical values of */
/* LFRAME, then the total length of all pitch periods returned */
/* is always N*LFRAME-JSAMP, and JSAMP is always in the range 0
*/
/* to MAXPIT-1 (see below for why this is so). Thus JSAMP is */
/* the number of samples "left over" from the previous call to */
/* PITSYN, that haven't been "used" in a pitch period returned */
/* from this subroutine. Every time this subroutine is called,
*/
/* it returns pitch periods with a total length of at most */
/* LFRAME+JSAMP. */
/* IVOICO, IPITO, RCO, and JSAMP need not be assigned an initial value */
/* with a DATA statement, because they are always initialized on the */
/* first call to PITSYN. */
/* FIRST and RMSO should be initialized with DATA statements, because */
/* even on the first call, they are used before being initialized. */
/* Parameter adjustments */
if (rc) {
--rc;
}
if (rci) {
rci_dim1 = *order;
rci_offset = rci_dim1 + 1;
rci -= rci_offset;
}
if (voice) {
--voice;
}
if (ivuv) {
--ivuv;
}
if (ipiti) {
--ipiti;
}
if (rmsi) {
--rmsi;
}
/* Function Body */
ivoico = &(st->ivoico);
ipito = &(st->ipito);
rmso = &(st->rmso);
rco = &(st->rco[0]);
jsamp = &(st->jsamp);
first = &(st->first_pitsyn);
if (*rms < 1.f) {
*rms = 1.f;
}
if (*rmso < 1.f) {
*rmso = 1.f;
}
uvpit = 0.f;
*ratio = *rms / (*rmso + 8.f);
if (*first) {
lsamp = 0;
ivoice = voice[2];
if (ivoice == 0) {
*pitch = *lframe / 4;
}
*nout = *lframe / *pitch;
*jsamp = *lframe - *nout * *pitch;
/* SYNTHS only calls this subroutine with PITCH in the range
20 */
/* to 156. LFRAME = MAXFRM = 180, so NOUT is somewhere in th
e */
/* range 1 to 9. */
/* JSAMP is "LFRAME mod PITCH", so it is in the range 0 to */
/* (PITCH-1), or 0 to MAXPIT-1=155, after the first call. */
i__1 = *nout;
for (i__ = 1; i__ <= i__1; ++i__) {
i__2 = *order;
for (j = 1; j <= i__2; ++j) {
rci[j + i__ * rci_dim1] = rc[j];
}
ivuv[i__] = ivoice;
ipiti[i__] = *pitch;
rmsi[i__] = *rms;
}
*first = FALSE_;
} else {
vflag = 0;
lsamp = *lframe + *jsamp;
slope = (*pitch - *ipito) / (real) lsamp;
*nout = 0;
jused = 0;
istart = 1;
if (voice[1] == *ivoico && voice[2] == voice[1]) {
if (voice[2] == 0) {
/* SSUV - - 0 , 0 , 0 */
*pitch = *lframe / 4;
*ipito = *pitch;
if (*ratio > 8.f) {
*rmso = *rms;
}
}
/* SSVC - - 1 , 1 , 1 */
slope = (*pitch - *ipito) / (real) lsamp;
ivoice = voice[2];
} else {
if (*ivoico != 1) {
if (*ivoico == voice[1]) {
/* UV2VC2 - - 0 , 0 , 1 */
nl = lsamp - *lframe / 4;
} else {
/* UV2VC1 - - 0 , 1 , 1 */
nl = lsamp - *lframe * 3 / 4;
}
ipiti[1] = nl / 2;
ipiti[2] = nl - ipiti[1];
ivuv[1] = 0;
ivuv[2] = 0;
rmsi[1] = *rmso;
rmsi[2] = *rmso;
i__1 = *order;
for (i__ = 1; i__ <= i__1; ++i__) {
rci[i__ + rci_dim1] = rco[i__ - 1];
rci[i__ + (rci_dim1 << 1)] = rco[i__ - 1];
rco[i__ - 1] = rc[i__];
}
slope = 0.f;
*nout = 2;
*ipito = *pitch;
jused = nl;
istart = nl + 1;
ivoice = 1;
} else {
if (*ivoico != voice[1]) {
/* VC2UV1 - - 1 , 0 , 0 */
lsamp = *lframe / 4 + *jsamp;
} else {
/* VC2UV2 - - 1 , 1 , 0 */
lsamp = *lframe * 3 / 4 + *jsamp;
}
i__1 = *order;
for (i__ = 1; i__ <= i__1; ++i__) {
yarc[i__ - 1] = rc[i__];
rc[i__] = rco[i__ - 1];
}
ivoice = 1;
slope = 0.f;
vflag = 1;
}
}
/* Here is the value of most variables that are used below, depending
on */
/* the values of IVOICO, VOICE(1), and VOICE(2). VOICE(1) and VOICE(2
) */
/* are input arguments, and IVOICO is the value of VOICE(2) on the */
/* previous call (see notes for the IF (NOUT .NE. 0) statement near th
e */
/* end). Each of these three values is either 0 or 1. These three */
/* values below are given as 3-bit long strings, in the order IVOICO,
*/
/* VOICE(1), and VOICE(2). It appears that the code above assumes tha
t */
/* the bit sequences 010 and 101 never occur, but I wonder whether a
*/
/* large enough number of bit errors in the channel could cause such a
*/
/* thing to happen, and if so, could that cause NOUT to ever go over 1
1? */
/* Note that all of the 180 values in the table are really LFRAME, but
*/
/* 180 has fewer characters, and it makes the table a little more */
/* concrete. If LFRAME is ever changed, keep this in mind. Similarly
, */
/* 135's are 3*LFRAME/4, and 45's are LFRAME/4. If LFRAME is not a */
/* multiple of 4, then the 135 for NL-JSAMP is actually LFRAME-LFRAME/
4, */
/* and the 45 for NL-JSAMP is actually LFRAME-3*LFRAME/4. */
/* Note that LSAMP-JSAMP is given as the variable. This was just for
*/
/* brevity, to avoid adding "+JSAMP" to all of the column entries. */
/* Similarly for NL-JSAMP. */
/* Variable | 000 001 011,010 111 110 100,101 */
/* ------------+-------------------------------------------------- */
/* ISTART | 1 NL+1 NL+1 1 1 1 */
/* LSAMP-JSAMP | 180 180 180 180 135 45 */
/* IPITO | 45 PITCH PITCH oldPITCH oldPITCH oldPITCH */
/* SLOPE | 0 0 0 seebelow 0 0 */
/* JUSED | 0 NL NL 0 0 0 */
/* PITCH | 45 PITCH PITCH PITCH PITCH PITCH */
/* NL-JSAMP | -- 135 45 -- -- -- */
/* VFLAG | 0 0 0 0 1 1 */
/* NOUT | 0 2 2 0 0 0 */
/* IVOICE | 0 1 1 1 1 1 */
/* while_loop | once once once once twice twice */
/* ISTART | -- -- -- -- JUSED+1 JUSED+1 */
/* LSAMP-JSAMP | -- -- -- -- 180 180 */
/* IPITO | -- -- -- -- oldPITCH oldPITCH */
/* SLOPE | -- -- -- -- 0 0 */
/* JUSED | -- -- -- -- ?? ?? */
/* PITCH | -- -- -- -- PITCH PITCH */
/* NL-JSAMP | -- -- -- -- -- -- */
/* VFLAG | -- -- -- -- 0 0 */
/* NOUT | -- -- -- -- ?? ?? */
/* IVOICE | -- -- -- -- 0 0 */
/* UVPIT is always 0.0 on the first pass through the DO WHILE (.TRUE.)
*/
/* loop below. */
/* The only possible non-0 value of SLOPE (in column 111) is */
/* (PITCH-IPITO)/FLOAT(LSAMP) */
/* Column 101 is identical to 100. Any good properties we can prove
*/
/* for 100 will also hold for 101. Similarly for 010 and 011. */
/* SYNTHS calls this subroutine with PITCH restricted to the range 20
to */
/* 156. IPITO is similarly restricted to this range, after the first
*/
/* call. IP below is also restricted to this range, given the */
/* definitions of IPITO, SLOPE, UVPIT, and that I is in the range ISTA
RT */
/* to LSAMP. */
while(TRUE_) {
/* JUSED is the total length of all pitch periods curr
ently */
/* in the output arrays, in samples. */
/* An invariant of the DO I = ISTART,LSAMP loop below,
under */
/* the condition that IP is always in the range 1 thro
ugh */
/* MAXPIT, is: */
/* (I - MAXPIT) .LE. JUSED .LE. (I-1) */
/* Note that the final value of I is LSAMP+1, so that
after */
/* the DO loop is complete, we know: */
/* (LSAMP - MAXPIT + 1) .LE. JUSED .LE. LSAMP */
i__1 = lsamp;
for (i__ = istart; i__ <= i__1; ++i__) {
r__1 = *ipito + slope * i__;
ip = r__1 + .5f;
if (uvpit != 0.f) {
ip = uvpit;
}
if (ip <= i__ - jused) {
++(*nout);
/* The following check is no longer nece
ssary, now that */
/* we can prove that NOUT will never go
over 16. */
/* IF (NOUT .GT. 16) STOP 'PITSYN: too many epochs'
*/
ipiti[*nout] = ip;
*pitch = ip;
ivuv[*nout] = ivoice;
jused += ip;
prop = (jused - ip / 2) / (real) lsamp;
i__2 = *order;
for (j = 1; j <= i__2; ++j) {
alro = log((rco[j - 1] + 1) / (1 - rco[j - 1]));
alrn = log((rc[j] + 1) / (1 - rc[j]));
xxy = alro + prop * (alrn - alro);
xxy = exp(xxy);
rci[j + *nout * rci_dim1] = (xxy - 1) / (xxy + 1);
}
rmsi[*nout] = log(*rmso) + prop * (log(*rms) - log(*rmso));
rmsi[*nout] = exp(rmsi[*nout]);
}
}
if (vflag != 1) {
goto L100;
}
/* I want to prove what range UVPIT must lie in after
the */
/* assignments to it below. To do this, I must determ
ine */
/* what range (LSAMP-ISTART) must lie in, after the */
/* assignments to ISTART and LSAMP below. */
/* Let oldLSAMP be the value of LSAMP at this point in
the */
/* execution. This is 135+JSAMP in state 110, or 45+J
SAMP in */
/* states 100 or 101. */
/* Given the loop invariant on JUSED above, we know th
at: */
/* (oldLSAMP - MAXPIT + 1) .LE. JUSED .LE. oldLSAMP */
/* ISTART is one more than this. */
/* Let newLSAMP be the value assigned to LSAMP below.
This */
/* is 180+JSAMP. Thus (newLSAMP-oldLSAMP) is either 4
5 or */
/* 135, depending on the state. */
/* Thus, the range of newLSAMP-ISTART is: */
/* (newLSAMP-(oldLSAMP+1)) .LE. newLSAMP-ISTART */
/* .LE. (newLSAMP-(oldLSAMP - MAXPIT + 2)) */
/* or: */
/* 46 .LE. newLSAMP-ISTART .LE. 133+MAXPIT .EQ. 289 */
/* Therefore, UVPIT is in the range 23 to 144 after th
e first */
/* assignment to UVPIT below, and after the conditiona
l */
/* assignment, it is in the range 23 to 90. */
/* The important thing is that it is in the range 20 t
o 156, */
/* so that in the loop above, IP is always in this ran
ge. */
vflag = 0;
istart = jused + 1;
lsamp = *lframe + *jsamp;
slope = 0.f;
ivoice = 0;
uvpit = (real) ((lsamp - istart) / 2);
if (uvpit > 90.f) {
uvpit /= 2;
}
*rmso = *rms;
i__1 = *order;
for (i__ = 1; i__ <= i__1; ++i__) {
rc[i__] = yarc[i__ - 1];
rco[i__ - 1] = yarc[i__ - 1];
}
}
L100:
*jsamp = lsamp - jused;
}
/* Given that the maximum pitch period MAXPIT .LT. LFRAME (this is
*/
/* currently true on every call, since SYNTHS always sets */
/* LFRAME=180), NOUT will always be .GE. 1 at this point. */
if (*nout != 0) {
*ivoico = voice[2];
*ipito = *pitch;
*rmso = *rms;
i__1 = *order;
for (i__ = 1; i__ <= i__1; ++i__) {
rco[i__ - 1] = rc[i__];
}
}
return 0;
} /* pitsyn_ */

218
codecs/lpc10/placea.c Executable file
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@@ -0,0 +1,218 @@
/*
$Log$
Revision 1.1 2000/01/05 08:20:39 markster
Version 0.1.2 from FTP
Revision 1.2 2000/01/05 08:20:39 markster
Some OSS fixes and a few lpc changes to make it actually work
* Revision 1.1 1996/08/19 22:31:07 jaf
* Initial revision
*
*/
#ifdef P_R_O_T_O_T_Y_P_E_S
extern int placea_(integer *ipitch, integer *voibuf, integer *obound, integer *af, integer *vwin, integer *awin, integer *ewin, integer *lframe, integer *maxwin);
#endif
/* -- translated by f2c (version 19951025).
You must link the resulting object file with the libraries:
-lf2c -lm (in that order)
*/
#include "f2c.h"
/* *********************************************************************** */
/* PLACEA Version 48 */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.1 1996/08/19 22:31:07 jaf
* Initial revision
* */
/* Revision 1.5 1996/03/19 20:41:55 jaf */
/* Added some conditions satisfied by the output values in EWIN. */
/* Revision 1.4 1996/03/19 20:24:17 jaf */
/* Added some conditions satisfied by the output values in AWIN. */
/* Revision 1.3 1996/03/18 21:40:04 jaf */
/* Just added a few comments about which array indices of the arguments */
/* are used, and mentioning that this subroutine has no local state. */
/* Revision 1.2 1996/03/13 16:43:09 jaf */
/* Comments added explaining that none of the local variables of this */
/* subroutine need to be saved from one invocation to the next. */
/* Revision 1.1 1996/02/07 14:48:31 jaf */
/* Initial revision */
/* *********************************************************************** */
/* Input: */
/* IPITCH */
/* VOIBUF */
/* Indices (2,AF-2), (1,AF-1), (2,AF-1), (1,AF), and (2,AF) read.*/
/* All other indices untouched. */
/* OBOUND */
/* AF */
/* VWIN */
/* Indices (1,AF) and (2,AF) read. */
/* All other indices untouched. */
/* LFRAME */
/* MAXWIN */
/* Input/Output: */
/* AWIN */
/* Index (1,AF-1) read. */
/* Indices (1,AF) and (2,AF) written, and then read. */
/* All other indices untouched. */
/* In all cases (except possibly one), the final values will */
/* satisfy the condition: AWIN(2,AF)-AWIN(1,AF)+1 = MAXWIN. */
/* In that other case, */
/* AWIN(1,AF)=VWIN(1,AF) and AWIN(2,AF)=VWIN(2,AF). */
/* Output: */
/* EWIN */
/* Indices (1,AF) and (2,AF) written. */
/* All other indices untouched. */
/* In all cases, the final values will satisfy the condition: */
/* AWIN(1,AF) .LE. EWIN(1,AF) .LE. EWIN(2,AF) .LE. AWIN(2,AF) */
/* In other words, the energy window is a sub-window of */
/* the analysis window. */
/* This subroutine has no local state. */
/* Subroutine */ int placea_(integer *ipitch, integer *voibuf, integer *
obound, integer *af, integer *vwin, integer *awin, integer *ewin,
integer *lframe, integer *maxwin)
{
/* System generated locals */
real r__1;
/* Builtin functions */
integer i_nint(real *);
/* Local variables */
logical allv, winv;
integer i__, j, k, l, hrange;
logical ephase;
integer lrange;
/* Arguments */
/* Local variables that need not be saved */
/* Parameter adjustments */
ewin -= 3;
awin -= 3;
vwin -= 3;
--voibuf;
/* Function Body */
lrange = (*af - 2) * *lframe + 1;
hrange = *af * *lframe;
/* Place the Analysis window based on the voicing window */
/* placement, onsets, tentative voicing decision, and pitch. */
/* Case 1: Sustained Voiced Speech */
/* If the five most recent voicing decisions are */
/* voiced, then the window is placed phase-synchronously with the */
/* previous window, as close to the present voicing window if possible.
*/
/* If onsets bound the voicing window, then preference is given to */
/* a phase-synchronous placement which does not overlap these onsets. */
/* Case 2: Voiced Transition */
/* If at least one voicing decision in AF is voicied, and there are no
*/
/* onsets, then the window is placed as in case 1. */
/* Case 3: Unvoiced Speech or Onsets */
/* If both voicing decisions in AF are unvoiced, or there are onsets, */
/* then the window is placed coincident with the voicing window. */
/* Note: During phase-synchronous placement of windows, the length */
/* is not altered from MAXWIN, since this would defeat the purpose */
/* of phase-synchronous placement. */
/* Check for case 1 and case 2 */
allv = voibuf[(*af - 2 << 1) + 2] == 1;
allv = allv && voibuf[(*af - 1 << 1) + 1] == 1;
allv = allv && voibuf[(*af - 1 << 1) + 2] == 1;
allv = allv && voibuf[(*af << 1) + 1] == 1;
allv = allv && voibuf[(*af << 1) + 2] == 1;
winv = voibuf[(*af << 1) + 1] == 1 || voibuf[(*af << 1) + 2] == 1;
if (allv || winv && *obound == 0) {
/* APHASE: Phase synchronous window placement. */
/* Get minimum lower index of the window. */
i__ = (lrange + *ipitch - 1 - awin[(*af - 1 << 1) + 1]) / *ipitch;
i__ *= *ipitch;
i__ += awin[(*af - 1 << 1) + 1];
/* L = the actual length of this frame's analysis window. */
l = *maxwin;
/* Calculate the location where a perfectly centered window would star
t. */
k = (vwin[(*af << 1) + 1] + vwin[(*af << 1) + 2] + 1 - l) / 2;
/* Choose the actual location to be the pitch multiple closest to this
. */
r__1 = (real) (k - i__) / *ipitch;
awin[(*af << 1) + 1] = i__ + i_nint(&r__1) * *ipitch;
awin[(*af << 1) + 2] = awin[(*af << 1) + 1] + l - 1;
/* If there is an onset bounding the right of the voicing window and t
he */
/* analysis window overlaps that, then move the analysis window backwa
rd */
/* to avoid this onset. */
if (*obound >= 2 && awin[(*af << 1) + 2] > vwin[(*af << 1) + 2]) {
awin[(*af << 1) + 1] -= *ipitch;
awin[(*af << 1) + 2] -= *ipitch;
}
/* Similarly for the left of the voicing window. */
if ((*obound == 1 || *obound == 3) && awin[(*af << 1) + 1] < vwin[(*
af << 1) + 1]) {
awin[(*af << 1) + 1] += *ipitch;
awin[(*af << 1) + 2] += *ipitch;
}
/* If this placement puts the analysis window above HRANGE, then */
/* move it backward an integer number of pitch periods. */
while(awin[(*af << 1) + 2] > hrange) {
awin[(*af << 1) + 1] -= *ipitch;
awin[(*af << 1) + 2] -= *ipitch;
}
/* Similarly if the placement puts the analysis window below LRANGE.
*/
while(awin[(*af << 1) + 1] < lrange) {
awin[(*af << 1) + 1] += *ipitch;
awin[(*af << 1) + 2] += *ipitch;
}
/* Make Energy window be phase-synchronous. */
ephase = TRUE_;
/* Case 3 */
} else {
awin[(*af << 1) + 1] = vwin[(*af << 1) + 1];
awin[(*af << 1) + 2] = vwin[(*af << 1) + 2];
ephase = FALSE_;
}
/* RMS is computed over an integer number of pitch periods in the analysis
*/
/*window. When it is not placed phase-synchronously, it is placed as clos
e*/
/* as possible to onsets. */
j = (awin[(*af << 1) + 2] - awin[(*af << 1) + 1] + 1) / *ipitch * *ipitch;
if (j == 0 || ! winv) {
ewin[(*af << 1) + 1] = vwin[(*af << 1) + 1];
ewin[(*af << 1) + 2] = vwin[(*af << 1) + 2];
} else if (! ephase && *obound == 2) {
ewin[(*af << 1) + 1] = awin[(*af << 1) + 2] - j + 1;
ewin[(*af << 1) + 2] = awin[(*af << 1) + 2];
} else {
ewin[(*af << 1) + 1] = awin[(*af << 1) + 1];
ewin[(*af << 1) + 2] = awin[(*af << 1) + 1] + j - 1;
}
return 0;
} /* placea_ */

257
codecs/lpc10/placev.c Executable file
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@@ -0,0 +1,257 @@
/*
$Log$
Revision 1.1 2000/01/05 08:20:39 markster
Version 0.1.2 from FTP
Revision 1.2 2000/01/05 08:20:39 markster
Some OSS fixes and a few lpc changes to make it actually work
* Revision 1.1 1996/08/19 22:31:02 jaf
* Initial revision
*
*/
#ifdef P_R_O_T_O_T_Y_P_E_S
extern int placev_(integer *osbuf, integer *osptr, integer *oslen, integer *obound, integer *vwin, integer *af, integer *lframe, integer *minwin, integer *maxwin, integer *dvwinl, integer *dvwinh);
#endif
/* -- translated by f2c (version 19951025).
You must link the resulting object file with the libraries:
-lf2c -lm (in that order)
*/
#include "f2c.h"
/* ****************************************************************** */
/* PLACEV Version 48 */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.1 1996/08/19 22:31:02 jaf
* Initial revision
* */
/* Revision 1.6 1996/03/19 20:42:19 jaf */
/* Added some conditions satisfied by the output values in VWIN. */
/* Revision 1.5 1996/03/19 18:37:56 jaf */
/* Strengthened the specification of which indices of VWIN are read and */
/* written. */
/* Revision 1.4 1996/03/15 16:38:33 jaf */
/* One tiny comment added. */
/* Revision 1.3 1996/03/15 16:36:13 jaf */
/* Added comments giving In/Out status of arguments. */
/* Revision 1.2 1996/03/12 23:56:01 jaf */
/* Comments added explaining that none of the local variables of this */
/* subroutine need to be saved from one invocation to the next. */
/* Revision 1.1 1996/02/07 14:48:39 jaf */
/* Initial revision */
/* ****************************************************************** */
/* Input: */
/* OSBUF Buffer which holds sorted indexes of onsets */
/* I believe that only indices 1 through OSPTR-1 can be read. */
/* OSLEN */
/* OSPTR Free pointer into OSBUF */
/* AF */
/* LFRAME */
/* MINWIN */
/* MAXWIN */
/* DVWINL */
/* DVWINH (This argument is never used. Should it be?) */
/* Input/Output: */
/* VWIN Buffer of Voicing Window Positions (Modified) */
/* Index (2,AF-1) is read. */
/* Indices (1,AF) and (2,AF) are written, */
/* and then possibly read. */
/* All other indices are unused. */
/* In all cases, the final values will satsify the condition:*/
/* VWIN(2,AF)-VWIN(1,AF)+1 .LE. MAXWIN */
/* I'm not certain yet, but they may also satisfy: */
/* MINWIN .LE. VWIN(2,AF)-VWIN(1,AF)+1 */
/* Output: */
/* OBOUND This variable is set by this procedure and used */
/* in placing analysis windows (PLACEA). Bit 1 */
/* indicates whether an onset bounds the left side */
/* of the voicing window, and bit 2 indicates whether */
/* an onset bounds the right side of the voicing window. */
/* This subroutine has no local state. */
/* Subroutine */ int placev_(integer *osbuf, integer *osptr, integer *oslen,
integer *obound, integer *vwin, integer *af, integer *lframe, integer
*minwin, integer *maxwin, integer *dvwinl, integer *dvwinh)
{
/* System generated locals */
integer i__1, i__2;
/* Local variables */
logical crit;
integer i__, q, osptr1, hrange, lrange;
/* Arguments */
/* Local variables that need not be saved */
/* Variables */
/* LRANGE, HRANGE Range in which window is placed */
/* OSPTR1 OSPTR excluding samples in 3F */
/* Local state */
/* None */
/* Voicing Window Placement */
/* __________________ __________________ ______________ */
/* | | | */
/* | 1F | 2F | 3F ... */
/* |__________________|__________________|______________ */
/* Previous | */
/* Window | */
/* ...________| */
/* | | */
/* ------>| This window's placement range |<------ */
/* | | */
/* There are three cases. Note that these are different from those */
/* given in the LPC-10e phase 1 report. */
/* 1. If there are no onsets in this range, then the voicing window */
/* is centered in the pitch window. If such a placement is not within
*/
/* the window's placement range, then the window is placed in the left-
*/
/* most portion of the placement range. Its length is always MAXWIN. */
/* 2. If the first onset is in 2F and there is sufficient room to place
*/
/* the window immediately before this onset, then the window is placed
*/
/* there, and its length is set to the maximum possible under these */
/* constraints. */
/* "Critical Region Exception": If there is another onset in 2F */
/* such that a window can be placed between the two onsets, the */
/* window is placed there (ie, as in case 3). */
/* 3. Otherwise, the window is placed immediately after the onset. The
*/
/* window's length */
/* is the longest length that can fit in the range under these constraint
s,*/
/* except that the window may be shortened even further to avoid overlapp
ing*/
/* other onsets in the placement range. In any case, the window's length
*/
/* is at least MINWIN. */
/* Note that the values of MINWIN and LFRAME must be chosen such */
/* that case 2 = false implies case 3 = true. This means that */
/* MINWIN <= LFRAME/2. If this were not the case, then a fourth case */
/* would have to be added for when the window cannot fit either before
*/
/* or after the onset. */
/* Note also that onsets which weren't in 2F last time may be in 1F this
*/
/* time, due to the filter delays in computing onsets. The result is tha
t*/
/* occasionally a voicing window will overlap that onset. The only way
*/
/* to circumvent this problem is to add more delay in processing input
*/
/* speech. In the trade-off between delay and window-placement, window
*/
/* placement lost. */
/* Compute the placement range */
/* Parameter adjustments */
--osbuf;
vwin -= 3;
/* Function Body */
/* Computing MAX */
i__1 = vwin[(*af - 1 << 1) + 2] + 1, i__2 = (*af - 2) * *lframe + 1;
lrange = max(i__1,i__2);
hrange = *af * *lframe;
/* Compute OSPTR1, so the following code only looks at relevant onsets. */
for (osptr1 = *osptr - 1; osptr1 >= 1; --osptr1) {
if (osbuf[osptr1] <= hrange) {
goto L90;
}
}
L90:
++osptr1;
/* Check for case 1 first (fast case): */
if (osptr1 <= 1 || osbuf[osptr1 - 1] < lrange) {
/* Computing MAX */
i__1 = vwin[(*af - 1 << 1) + 2] + 1;
vwin[(*af << 1) + 1] = max(i__1,*dvwinl);
vwin[(*af << 1) + 2] = vwin[(*af << 1) + 1] + *maxwin - 1;
*obound = 0;
} else {
/* Search backward in OSBUF for first onset in range. */
/* This code relies on the above check being performed first. */
for (q = osptr1 - 1; q >= 1; --q) {
if (osbuf[q] < lrange) {
goto L100;
}
}
L100:
++q;
/* Check for case 2 (placement before onset): */
/* Check for critical region exception: */
i__1 = osptr1 - 1;
for (i__ = q + 1; i__ <= i__1; ++i__) {
if (osbuf[i__] - osbuf[q] >= *minwin) {
crit = TRUE_;
goto L105;
}
}
crit = FALSE_;
L105:
/* Computing MAX */
i__1 = (*af - 1) * *lframe, i__2 = lrange + *minwin - 1;
if (! crit && osbuf[q] > max(i__1,i__2)) {
vwin[(*af << 1) + 2] = osbuf[q] - 1;
/* Computing MAX */
i__1 = lrange, i__2 = vwin[(*af << 1) + 2] - *maxwin + 1;
vwin[(*af << 1) + 1] = max(i__1,i__2);
*obound = 2;
/* Case 3 (placement after onset) */
} else {
vwin[(*af << 1) + 1] = osbuf[q];
L110:
++q;
if (q >= osptr1) {
goto L120;
}
if (osbuf[q] > vwin[(*af << 1) + 1] + *maxwin) {
goto L120;
}
if (osbuf[q] < vwin[(*af << 1) + 1] + *minwin) {
goto L110;
}
vwin[(*af << 1) + 2] = osbuf[q] - 1;
*obound = 3;
return 0;
L120:
/* Computing MIN */
i__1 = vwin[(*af << 1) + 1] + *maxwin - 1;
vwin[(*af << 1) + 2] = min(i__1,hrange);
*obound = 1;
}
}
return 0;
} /* placev_ */

132
codecs/lpc10/preemp.c Executable file
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@@ -0,0 +1,132 @@
/*
$Log$
Revision 1.1 2000/01/05 08:20:39 markster
Version 0.1.2 from FTP
Revision 1.2 2000/01/05 08:20:39 markster
Some OSS fixes and a few lpc changes to make it actually work
* Revision 1.1 1996/08/19 22:30:58 jaf
* Initial revision
*
*/
#ifdef P_R_O_T_O_T_Y_P_E_S
extern int preemp_(real *inbuf, real *pebuf, integer *nsamp, real *coef, real *z__);
#endif
/* -- translated by f2c (version 19951025).
You must link the resulting object file with the libraries:
-lf2c -lm (in that order)
*/
#include "f2c.h"
/* ******************************************************************* */
/* PREEMP Version 55 */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.1 1996/08/19 22:30:58 jaf
* Initial revision
* */
/* Revision 1.3 1996/03/14 23:16:29 jaf */
/* Just added a few comments about which array indices of the arguments */
/* are used, and mentioning that this subroutine has no local state. */
/* Revision 1.2 1996/03/11 23:23:34 jaf */
/* Added a bunch of comments to an otherwise simple subroutine. */
/* Revision 1.1 1996/02/07 14:48:48 jaf */
/* Initial revision */
/* ******************************************************************* */
/* Preemphasize speech with a single-zero filter. */
/* (When coef = .9375, preemphasis is as in LPC43.) */
/* Inputs: */
/* NSAMP - Number of samples to filter */
/* INBUF - Input speech buffer */
/* Indices 1 through NSAMP are read. */
/* COEF - Preemphasis coefficient */
/* Input/Output: */
/* Z - Filter state */
/* Output: */
/* PEBUF - Preemphasized speech buffer (can be equal to INBUF) */
/* Indices 1 through NSAMP are modified. */
/* This subroutine has no local state. */
/* Subroutine */ int preemp_(real *inbuf, real *pebuf, integer *nsamp, real *
coef, real *z__)
{
/* System generated locals */
integer i__1;
/* Local variables */
real temp;
integer i__;
/* Arguments */
/* Local variables */
/* None of these need to have their values saved from one */
/* invocation to the next. */
/* Logically, this subroutine computes the output sequence */
/* pebuf(1:nsamp) defined by: */
/* pebuf(i) = inbuf(i) - coef * inbuf(i-1) */
/* where inbuf(0) is defined by the value of z given as input to */
/* this subroutine. */
/* What is this filter's frequency response and phase response? */
/* Why is this filter applied to the speech? */
/* Could it be more efficient to apply multiple filters */
/* simultaneously, by combining them into one equivalent filter? */
/* Are there ever cases when "factoring" one high-order filter into
*/
/* multiple smaller-order filter actually reduces the number of */
/* arithmetic operations needed to perform them? */
/* When I first read this subroutine, I didn't understand why the */
/* variable temp was used. It seemed that the statements in the do
*/
/* loop could be replaced with the following: */
/* pebuf(i) = inbuf(i) - coef * z */
/* z = inbuf(i) */
/* The reason for temp is so that even if pebuf and inbuf are the */
/* same arrays in memory (i.e., they are aliased), then this */
/* subroutine will still work correctly. I didn't realize this */
/* until seeing the comment after PEBUF above that says "(can be */
/* equal to INBUF)". */
/* Parameter adjustments */
--pebuf;
--inbuf;
/* Function Body */
i__1 = *nsamp;
for (i__ = 1; i__ <= i__1; ++i__) {
temp = inbuf[i__] - *coef * *z__;
*z__ = inbuf[i__];
pebuf[i__] = temp;
/* L10: */
}
return 0;
} /* preemp_ */

105
codecs/lpc10/prepro.c Executable file
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@@ -0,0 +1,105 @@
/*
$Log$
Revision 1.1 2000/01/05 08:20:39 markster
Version 0.1.2 from FTP
Revision 1.2 2000/01/05 08:20:39 markster
Some OSS fixes and a few lpc changes to make it actually work
* Revision 1.2 1996/08/20 20:40:51 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_encoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_encoder_state().
*
* Revision 1.1 1996/08/19 22:30:54 jaf
* Initial revision
*
*/
#ifdef P_R_O_T_O_T_Y_P_E_S
extern int prepro_(real *speech, integer *length,
struct lpc10_encoder_state *st)
/*:ref: hp100_ 14 3 6 4 4 */
/*:ref: inithp100_ 14 0 */
#endif
/* -- translated by f2c (version 19951025).
You must link the resulting object file with the libraries:
-lf2c -lm (in that order)
*/
#include "f2c.h"
/* Table of constant values */
static integer c__1 = 1;
/* ********************************************************************* */
/* PREPRO Version 48 */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.2 1996/08/20 20:40:51 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_encoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_encoder_state().
*
* Revision 1.1 1996/08/19 22:30:54 jaf
* Initial revision
* */
/* Revision 1.3 1996/03/14 23:22:56 jaf */
/* Added comments about when INITPREPRO should be used. */
/* Revision 1.2 1996/03/14 23:09:27 jaf */
/* Added an entry named INITPREPRO that initializes the local state of */
/* this subroutine, and those it calls (if any). */
/* Revision 1.1 1996/02/07 14:48:54 jaf */
/* Initial revision */
/* ********************************************************************* */
/* Pre-process input speech: */
/* Inputs: */
/* LENGTH - Number of SPEECH samples */
/* Input/Output: */
/* SPEECH(LENGTH) - Speech data. */
/* Indices 1 through LENGTH are read and modified. */
/* This subroutine has no local state maintained from one call to the */
/* next, but HP100 does. If you want to switch to using a new audio */
/* stream for this filter, or reinitialize its state for any other */
/* reason, call the ENTRY INITPREPRO. */
/* Subroutine */ int prepro_(real *speech, integer *length,
struct lpc10_encoder_state *st)
{
extern /* Subroutine */ int hp100_(real *, integer *, integer *, struct lpc10_encoder_state *);
/* Arguments */
/* High Pass Filter at 100 Hz */
/* Parameter adjustments */
if (speech) {
--speech;
}
/* Function Body */
hp100_(&speech[1], &c__1, length, st);
return 0;
} /* prepro_ */

113
codecs/lpc10/random.c Executable file
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/*
$Log$
Revision 1.1 2000/01/05 08:20:39 markster
Version 0.1.2 from FTP
Revision 1.2 2000/01/05 08:20:39 markster
Some OSS fixes and a few lpc changes to make it actually work
* Revision 1.2 1996/08/20 20:41:32 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_decoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_decoder_state().
*
* Revision 1.1 1996/08/19 22:30:49 jaf
* Initial revision
*
*/
#ifdef P_R_O_T_O_T_Y_P_E_S
extern integer random_(struct lpc10_decoder_state *st);
#endif
/* -- translated by f2c (version 19951025).
You must link the resulting object file with the libraries:
-lf2c -lm (in that order)
*/
#include "f2c.h"
/* ********************************************************************** */
/* RANDOM Version 49 */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.2 1996/08/20 20:41:32 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_decoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_decoder_state().
*
* Revision 1.1 1996/08/19 22:30:49 jaf
* Initial revision
* */
/* Revision 1.3 1996/03/20 16:13:54 jaf */
/* Rearranged comments a little bit, and added comments explaining that */
/* even though there is local state here, there is no need to create an */
/* ENTRY for reinitializing it. */
/* Revision 1.2 1996/03/14 22:25:29 jaf */
/* Just rearranged the comments and local variable declarations a bit. */
/* Revision 1.1 1996/02/07 14:49:01 jaf */
/* Initial revision */
/* ********************************************************************* */
/* Pseudo random number generator based on Knuth, Vol 2, p. 27. */
/* Function Return: */
/* RANDOM - Integer variable, uniformly distributed over -32768 to 32767 */
/* This subroutine maintains local state from one call to the next. */
/* In the context of the LPC10 coder, there is no reason to reinitialize */
/* this local state when switching between audio streams, because its */
/* results are only used to generate noise for unvoiced frames. */
integer random_(struct lpc10_decoder_state *st)
{
/* Initialized data */
integer *j;
integer *k;
shortint *y;
/* System generated locals */
integer ret_val;
/* Parameters/constants */
/* Local state */
/* The following is a 16 bit 2's complement addition, */
/* with overflow checking disabled */
j = &(st->j);
k = &(st->k);
y = &(st->y[0]);
y[*k - 1] += y[*j - 1];
ret_val = y[*k - 1];
--(*k);
if (*k <= 0) {
*k = 5;
}
--(*j);
if (*j <= 0) {
*j = 5;
}
return ret_val;
} /* random_ */

107
codecs/lpc10/rcchk.c Executable file
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@@ -0,0 +1,107 @@
/*
$Log$
Revision 1.1 2000/01/05 08:20:39 markster
Version 0.1.2 from FTP
Revision 1.2 2000/01/05 08:20:39 markster
Some OSS fixes and a few lpc changes to make it actually work
* Revision 1.1 1996/08/19 22:30:41 jaf
* Initial revision
*
*/
#ifdef P_R_O_T_O_T_Y_P_E_S
extern int rcchk_(integer *order, real *rc1f, real *rc2f);
#endif
/* -- translated by f2c (version 19951025).
You must link the resulting object file with the libraries:
-lf2c -lm (in that order)
*/
#include "f2c.h"
/* ********************************************************************* */
/* RCCHK Version 45G */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.1 1996/08/19 22:30:41 jaf
* Initial revision
* */
/* Revision 1.4 1996/03/27 18:13:47 jaf */
/* Commented out a call to subroutine ERROR. */
/* Revision 1.3 1996/03/18 15:48:53 jaf */
/* Just added a few comments about which array indices of the arguments */
/* are used, and mentioning that this subroutine has no local state. */
/* Revision 1.2 1996/03/13 16:55:22 jaf */
/* Comments added explaining that none of the local variables of this */
/* subroutine need to be saved from one invocation to the next. */
/* Revision 1.1 1996/02/07 14:49:08 jaf */
/* Initial revision */
/* ********************************************************************* */
/* Check RC's, repeat previous frame's RC's if unstable */
/* Input: */
/* ORDER - Number of RC's */
/* RC1F - Previous frame's RC's */
/* Indices 1 through ORDER may be read. */
/* Input/Output: */
/* RC2F - Present frame's RC's */
/* Indices 1 through ORDER may be read, and written. */
/* This subroutine has no local state. */
/* Subroutine */ int rcchk_(integer *order, real *rc1f, real *rc2f)
{
/* System generated locals */
integer i__1;
real r__1;
/* Local variables */
integer i__;
/* Arguments */
/* Local variables that need not be saved */
/* Parameter adjustments */
--rc2f;
--rc1f;
/* Function Body */
i__1 = *order;
for (i__ = 1; i__ <= i__1; ++i__) {
if ((r__1 = rc2f[i__], abs(r__1)) > .99f) {
goto L10;
}
}
return 0;
/* Note: In version embedded in other software, all calls to ERROR
*/
/* should probably be removed. */
L10:
/* This call to ERROR is only needed for debugging purposes. */
/* CALL ERROR('RCCHK',2,I) */
i__1 = *order;
for (i__ = 1; i__ <= i__1; ++i__) {
rc2f[i__] = rc1f[i__];
}
return 0;
} /* rcchk_ */

392
codecs/lpc10/synths.c Executable file
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@@ -0,0 +1,392 @@
/*
$Log$
Revision 1.1 2000/01/05 08:20:39 markster
Version 0.1.2 from FTP
Revision 1.2 2000/01/05 08:20:39 markster
Some OSS fixes and a few lpc changes to make it actually work
* Revision 1.2 1996/08/20 20:42:59 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_decoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_decoder_state().
*
* Revision 1.1 1996/08/19 22:30:33 jaf
* Initial revision
*
*/
#ifdef P_R_O_T_O_T_Y_P_E_S
extern int synths_(integer *voice, integer *pitch, real *rms, real *rc, real *speech, integer *k, struct lpc10_decoder_state *st);
/* comlen contrl_ 12 */
/*:ref: pitsyn_ 14 12 4 4 4 6 6 4 4 4 6 6 4 6 */
/*:ref: irc2pc_ 14 5 6 6 4 6 6 */
/*:ref: bsynz_ 14 7 6 4 4 6 6 6 6 */
/*:ref: deemp_ 14 2 6 4 */
/*:ref: initpitsyn_ 14 0 */
/*:ref: initbsynz_ 14 0 */
/*:ref: initdeemp_ 14 0 */
#endif
/* -- translated by f2c (version 19951025).
You must link the resulting object file with the libraries:
-lf2c -lm (in that order)
*/
#include "f2c.h"
/* Common Block Declarations */
extern struct {
integer order, lframe;
logical corrp;
} contrl_;
#define contrl_1 contrl_
/* Table of constant values */
static real c_b2 = .7f;
/* ***************************************************************** */
/* SYNTHS Version 54 */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.2 1996/08/20 20:42:59 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_decoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_decoder_state().
*
* Revision 1.1 1996/08/19 22:30:33 jaf
* Initial revision
* */
/* Revision 1.5 1996/03/26 19:31:58 jaf */
/* Commented out trace statements. */
/* Revision 1.4 1996/03/25 19:41:01 jaf */
/* Changed so that MAXFRM samples are always returned in the output array */
/* SPEECH. */
/* This required delaying the returned samples by MAXFRM sample times, */
/* and remembering any "left over" samples returned by PITSYN from one */
/* call of SYNTHS to the next. */
/* Changed size of SPEECH from 2*MAXFRM to MAXFRM. Removed local */
/* variable SOUT. Added local state variables BUF and BUFLEN. */
/* Revision 1.3 1996/03/25 19:20:10 jaf */
/* Added comments about the range of possible return values for argument */
/* K, and increased the size of the arrays filled in by PITSYN from 11 to */
/* 16, as has been already done inside of PITSYN. */
/* Revision 1.2 1996/03/22 00:18:18 jaf */
/* Added comments explaining meanings of input and output parameters, and */
/* indicating which array indices can be read or written. */
/* Added entry INITSYNTHS, which does nothing except call the */
/* corresponding initialization entries for subroutines PITSYN, BSYNZ, */
/* and DEEMP. */
/* Revision 1.1 1996/02/07 14:49:44 jaf */
/* Initial revision */
/* ***************************************************************** */
/* The note below is from the distributed version of the LPC10 coder. */
/* The version of the code below has been modified so that SYNTHS always */
/* has a constant frame length output of MAXFRM. */
/* Also, BSYNZ and DEEMP need not be modified to work on variable */
/* positions within an array. It is only necessary to pass the first */
/* index desired as the array argument. What actually gets passed is the */
/* address of that array position, which the subroutine treats as the */
/* first index of the array. */
/* This technique is used in subroutine ANALYS when calling PREEMP, so it */
/* appears that multiple people wrote different parts of this LPC10 code, */
/* and that they didn't necessarily have equivalent knowledge of Fortran */
/* (not surprising). */
/* NOTE: There is excessive buffering here, BSYNZ and DEEMP should be */
/* changed to operate on variable positions within SOUT. Also, */
/* the output length parameter is bogus, and PITSYN should be */
/* rewritten to allow a constant frame length output. */
/* Input: */
/* VOICE - Half frame voicing decisions */
/* Indices 1 through 2 read. */
/* Input/Output: */
/* PITCH - Pitch */
/* PITCH is restricted to range 20 to 156, inclusive, */
/* before calling subroutine PITSYN, and then PITSYN */
/* can modify it further under some conditions. */
/* RMS - Energy */
/* Only use is for debugging, and passed to PITSYN. */
/* See comments there for how it can be modified. */
/* RC - Reflection coefficients */
/* Indices 1 through ORDER restricted to range -.99 to .99, */
/* before calling subroutine PITSYN, and then PITSYN */
/* can modify it further under some conditions. */
/* Output: */
/* SPEECH - Synthesized speech samples. */
/* Indices 1 through the final value of K are written. */
/* K - Number of samples placed into array SPEECH. */
/* This is always MAXFRM. */
/* Subroutine */ int synths_(integer *voice, integer *pitch, real *
rms, real *rc, real *speech, integer *k, struct lpc10_decoder_state *st)
{
/* Initialized data */
real *buf;
integer *buflen;
/* System generated locals */
integer i__1;
real r__1, r__2;
/* Local variables */
real rmsi[16];
integer nout, ivuv[16], i__, j;
extern /* Subroutine */ int deemp_(real *, integer *, struct lpc10_decoder_state *);
real ratio;
integer ipiti[16];
extern /* Subroutine */ bsynz_(real *, integer *,
integer *, real *, real *, real *, real *, struct lpc10_decoder_state *), irc2pc_(real *, real *
, integer *, real *, real *);
real g2pass;
real pc[10];
extern /* Subroutine */ int pitsyn_(integer *, integer *, integer *, real
*, real *, integer *, integer *, integer *, real *, real *,
integer *, real *, struct lpc10_decoder_state *);
real rci[160] /* was [10][16] */;
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.2 1996/08/20 20:42:59 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_decoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_decoder_state().
*
* Revision 1.1 1996/08/19 22:30:33 jaf
* Initial revision
* */
/* Revision 1.3 1996/03/29 22:03:47 jaf */
/* Removed definitions for any constants that were no longer used. */
/* Revision 1.2 1996/03/26 19:34:33 jaf */
/* Added comments indicating which constants are not needed in an */
/* application that uses the LPC-10 coder. */
/* Revision 1.1 1996/02/07 14:43:51 jaf */
/* Initial revision */
/* LPC Configuration parameters: */
/* Frame size, Prediction order, Pitch period */
/* Arguments */
/* $Log$
* Revision 1.1 2000/01/05 08:20:39 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:39 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.2 1996/08/20 20:42:59 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_decoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_decoder_state().
*
* Revision 1.1 1996/08/19 22:30:33 jaf
* Initial revision
* */
/* Revision 1.3 1996/03/29 22:05:55 jaf */
/* Commented out the common block variables that are not needed by the */
/* embedded version. */
/* Revision 1.2 1996/03/26 19:34:50 jaf */
/* Added comments indicating which constants are not needed in an */
/* application that uses the LPC-10 coder. */
/* Revision 1.1 1996/02/07 14:44:09 jaf */
/* Initial revision */
/* LPC Processing control variables: */
/* *** Read-only: initialized in setup */
/* Files for Speech, Parameter, and Bitstream Input & Output, */
/* and message and debug outputs. */
/* Here are the only files which use these variables: */
/* lpcsim.f setup.f trans.f error.f vqsetup.f */
/* Many files which use fdebug are not listed, since it is only used in */
/* those other files conditionally, to print trace statements. */
/* integer fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
/* LPC order, Frame size, Quantization rate, Bits per frame, */
/* Error correction */
/* Subroutine SETUP is the only place where order is assigned a value, */
/* and that value is 10. It could increase efficiency 1% or so to */
/* declare order as a constant (i.e., a Fortran PARAMETER) instead of as
*/
/* a variable in a COMMON block, since it is used in many places in the */
/* core of the coding and decoding routines. Actually, I take that back.
*/
/* At least when compiling with f2c, the upper bound of DO loops is */
/* stored in a local variable before the DO loop begins, and then that is
*/
/* compared against on each iteration. */
/* Similarly for lframe, which is given a value of MAXFRM in SETUP. */
/* Similarly for quant, which is given a value of 2400 in SETUP. quant */
/* is used in only a few places, and never in the core coding and */
/* decoding routines, so it could be eliminated entirely. */
/* nbits is similar to quant, and is given a value of 54 in SETUP. */
/* corrp is given a value of .TRUE. in SETUP, and is only used in the */
/* subroutines ENCODE and DECODE. It doesn't affect the speed of the */
/* coder significantly whether it is .TRUE. or .FALSE., or whether it is
*/
/* a constant or a variable, since it is only examined once per frame. */
/* Leaving it as a variable that is set to .TRUE. seems like a good */
/* idea, since it does enable some error-correction capability for */
/* unvoiced frames, with no change in the coding rate, and no noticeable
*/
/* quality difference in the decoded speech. */
/* integer quant, nbits */
/* *** Read/write: variables for debugging, not needed for LPC algorithm
*/
/* Current frame, Unstable frames, Output clip count, Max onset buffer,
*/
/* Debug listing detail level, Line count on listing page */
/* nframe is not needed for an embedded LPC10 at all. */
/* nunsfm is initialized to 0 in SETUP, and incremented in subroutine */
/* ERROR, which is only called from RCCHK. When LPC10 is embedded into */
/* an application, I would recommend removing the call to ERROR in RCCHK,
*/
/* and remove ERROR and nunsfm completely. */
/* iclip is initialized to 0 in SETUP, and incremented in entry SWRITE in
*/
/* sread.f. When LPC10 is embedded into an application, one might want */
/* to cause it to be incremented in a routine that takes the output of */
/* SYNTHS and sends it to an audio device. It could be optionally */
/* displayed, for those that might want to know what it is. */
/* maxosp is never initialized to 0 in SETUP, although it probably should
*/
/* be, and it is updated in subroutine ANALYS. I doubt that its value */
/* would be of much interest to an application in which LPC10 is */
/* embedded. */
/* listl and lincnt are not needed for an embedded LPC10 at all. */
/* integer nframe, nunsfm, iclip, maxosp, listl, lincnt */
/* common /contrl/ fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
/* common /contrl/ quant, nbits */
/* common /contrl/ nframe, nunsfm, iclip, maxosp, listl, lincnt */
/* Parameters/constants */
/* Local variables that need not be saved */
/* Local state */
/* BUF is a buffer of speech samples that would have been returned
*/
/* by the older version of SYNTHS, but the newer version doesn't, */
/* so that the newer version can always return MAXFRM samples on */
/* every call. This has the effect of delaying the return of */
/* samples for one additional frame time. */
/* Indices 1 through BUFLEN contain samples that are left over from
*/
/* the last call to SYNTHS. Given the way that PITSYN works, */
/* BUFLEN should always be in the range MAXFRM-MAXPIT+1 through */
/* MAXFRM, inclusive, after a call to SYNTHS is complete. */
/* On the first call to SYNTHS (or the first call after */
/* reinitializing with the entry INITSYNTHS), BUFLEN is MAXFRM, and
*/
/* a frame of silence is always returned. */
/* Parameter adjustments */
if (voice) {
--voice;
}
if (rc) {
--rc;
}
if (speech) {
--speech;
}
/* Function Body */
buf = &(st->buf[0]);
buflen = &(st->buflen);
/* Computing MAX */
i__1 = min(*pitch,156);
*pitch = max(i__1,20);
i__1 = contrl_1.order;
for (i__ = 1; i__ <= i__1; ++i__) {
/* Computing MAX */
/* Computing MIN */
r__2 = rc[i__];
r__1 = min(r__2,.99f);
rc[i__] = max(r__1,-.99f);
}
pitsyn_(&contrl_1.order, &voice[1], pitch, rms, &rc[1], &contrl_1.lframe,
ivuv, ipiti, rmsi, rci, &nout, &ratio, st);
if (nout > 0) {
i__1 = nout;
for (j = 1; j <= i__1; ++j) {
/* Add synthesized speech for pitch period J to the en
d of */
/* BUF. */
irc2pc_(&rci[j * 10 - 10], pc, &contrl_1.order, &c_b2, &g2pass);
bsynz_(pc, &ipiti[j - 1], &ivuv[j - 1], &buf[*buflen], &rmsi[j - 1]
, &ratio, &g2pass, st);
deemp_(&buf[*buflen], &ipiti[j - 1], st);
*buflen += ipiti[j - 1];
}
/* Copy first MAXFRM samples from BUF to output array SPEECH
*/
/* (scaling them), and then remove them from the beginning of
*/
/* BUF. */
for (i__ = 1; i__ <= 180; ++i__) {
speech[i__] = buf[i__ - 1] / 4096.f;
}
*k = 180;
*buflen += -180;
i__1 = *buflen;
for (i__ = 1; i__ <= i__1; ++i__) {
buf[i__ - 1] = buf[i__ + 179];
}
}
return 0;
} /* synths_ */

176
codecs/lpc10/tbdm.c Executable file
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/*
$Log$
Revision 1.1 2000/01/05 08:20:40 markster
Version 0.1.2 from FTP
Revision 1.2 2000/01/05 08:20:40 markster
Some OSS fixes and a few lpc changes to make it actually work
* Revision 1.1 1996/08/19 22:30:26 jaf
* Initial revision
*
*/
#ifdef P_R_O_T_O_T_Y_P_E_S
extern int tbdm_(real *speech, integer *lpita, integer *tau, integer *ltau, real *amdf, integer *minptr, integer *maxptr, integer *mintau);
/*:ref: difmag_ 14 8 6 4 4 4 4 6 4 4 */
#endif
/* -- translated by f2c (version 19951025).
You must link the resulting object file with the libraries:
-lf2c -lm (in that order)
*/
#include "f2c.h"
/* ********************************************************************** */
/* TBDM Version 49 */
/* $Log$
* Revision 1.1 2000/01/05 08:20:40 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:40 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.1 1996/08/19 22:30:26 jaf
* Initial revision
* */
/* Revision 1.3 1996/03/18 22:14:00 jaf */
/* Just added a few comments about which array indices of the arguments */
/* are used, and mentioning that this subroutine has no local state. */
/* Revision 1.2 1996/03/13 14:48:37 jaf */
/* Comments added explaining that none of the local variables of this */
/* subroutine need to be saved from one invocation to the next. */
/* Revision 1.1 1996/02/07 14:49:54 jaf */
/* Initial revision */
/* ********************************************************************* */
/*TURBO DIFMAG: Compute High Resolution Average Magnitude Difference Function
*/
/* Note: There are several constants in here that appear to depend on a */
/* particular TAU table. That's not a problem for the LPC10 coder, but */
/* watch out if you change the contents of TAU in the subroutine ANALYS. */
/* Input: */
/* SPEECH - Low pass filtered speech */
/* Indices 1 through MAX+LPITA-1 are read, where: */
/* MAX = (TAU(LTAU)-TAU(1))/2+1 */
/* (If TAU(1) .LT. 39, then larger indices could be read */
/* by the last call to DIFMAG below.) */
/* LPITA - Length of speech buffer */
/* TAU - Table of lags, sorted in increasing order. */
/* Indices 1 through LTAU read. */
/* LTAU - Number of lag values to compute */
/* Output: */
/* AMDF - Average Magnitude Difference for each lag in TAU */
/* Indices 1 through LTAU written, and several might then be read.*/
/* MINPTR - Index of minimum AMDF value */
/* MAXPTR - Index of maximum AMDF value within +/- 1/2 octave of min */
/* MINTAU - Lag corresponding to minimum AMDF value */
/* This subroutine has no local state. */
/* Subroutine */ int tbdm_(real *speech, integer *lpita, integer *tau,
integer *ltau, real *amdf, integer *minptr, integer *maxptr, integer *
mintau)
{
/* System generated locals */
integer i__1, i__2, i__3, i__4;
/* Local variables */
real amdf2[6];
integer minp2, ltau2, maxp2, i__;
extern /* Subroutine */ int difmag_(real *, integer *, integer *, integer
*, integer *, real *, integer *, integer *);
integer minamd, ptr, tau2[6];
/* Arguments */
/* REAL SPEECH(LPITA+TAU(LTAU)), AMDF(LTAU) */
/* Stupid TOAST doesn't understand expressions */
/* Local variables that need not be saved */
/* Local state */
/* None */
/* Compute full AMDF using log spaced lags, find coarse minimum */
/* Parameter adjustments */
--speech;
--amdf;
--tau;
/* Function Body */
difmag_(&speech[1], lpita, &tau[1], ltau, &tau[*ltau], &amdf[1], minptr,
maxptr);
*mintau = tau[*minptr];
minamd = amdf[*minptr];
/* Build table containing all lags within +/- 3 of the AMDF minimum */
/* excluding all that have already been computed */
ltau2 = 0;
ptr = *minptr - 2;
/* Computing MAX */
i__1 = *mintau - 3;
/* Computing MIN */
i__3 = *mintau + 3, i__4 = tau[*ltau] - 1;
i__2 = min(i__3,i__4);
for (i__ = max(i__1,41); i__ <= i__2; ++i__) {
while(tau[ptr] < i__) {
++ptr;
}
if (tau[ptr] != i__) {
++ltau2;
tau2[ltau2 - 1] = i__;
}
}
/* Compute AMDF of the new lags, if there are any, and choose one */
/* if it is better than the coarse minimum */
if (ltau2 > 0) {
difmag_(&speech[1], lpita, tau2, &ltau2, &tau[*ltau], amdf2, &minp2, &
maxp2);
if (amdf2[minp2 - 1] < (real) minamd) {
*mintau = tau2[minp2 - 1];
minamd = amdf2[minp2 - 1];
}
}
/* Check one octave up, if there are any lags not yet computed */
if (*mintau >= 80) {
i__ = *mintau / 2;
if ((i__ & 1) == 0) {
ltau2 = 2;
tau2[0] = i__ - 1;
tau2[1] = i__ + 1;
} else {
ltau2 = 1;
tau2[0] = i__;
}
difmag_(&speech[1], lpita, tau2, &ltau2, &tau[*ltau], amdf2, &minp2, &
maxp2);
if (amdf2[minp2 - 1] < (real) minamd) {
*mintau = tau2[minp2 - 1];
minamd = amdf2[minp2 - 1];
*minptr += -20;
}
}
/* Force minimum of the AMDF array to the high resolution minimum */
amdf[*minptr] = (real) minamd;
/* Find maximum of AMDF within 1/2 octave of minimum */
/* Computing MAX */
i__2 = *minptr - 5;
*maxptr = max(i__2,1);
/* Computing MIN */
i__1 = *minptr + 5;
i__2 = min(i__1,*ltau);
for (i__ = *maxptr + 1; i__ <= i__2; ++i__) {
if (amdf[i__] > amdf[*maxptr]) {
*maxptr = i__;
}
}
return 0;
} /* tbdm_ */

759
codecs/lpc10/voicin.c Executable file
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/*
$Log$
Revision 1.1 2000/01/05 08:20:40 markster
Version 0.1.2 from FTP
Revision 1.2 2000/01/05 08:20:40 markster
Some OSS fixes and a few lpc changes to make it actually work
* Revision 1.2 1996/08/20 20:45:00 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_encoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_encoder_state().
*
* Revision 1.1 1996/08/19 22:30:14 jaf
* Initial revision
*
*/
#ifdef P_R_O_T_O_T_Y_P_E_S
extern int voicin_(integer *vwin, real *inbuf, real *lpbuf, integer *buflim, integer *half, real *minamd, real *maxamd, integer *mintau, real *ivrc, integer *obound, integer *voibuf, integer *af, struct lpc10_encoder_state *st);
/* comlen contrl_ 12 */
/*:ref: vparms_ 14 14 4 6 6 4 4 6 4 4 4 4 6 6 6 6 */
#endif
/* -- translated by f2c (version 19951025).
You must link the resulting object file with the libraries:
-lf2c -lm (in that order)
*/
#include "f2c.h"
/* Common Block Declarations */
extern struct {
integer order, lframe;
logical corrp;
} contrl_;
#define contrl_1 contrl_
/****************************************************************************/
/* VOICIN Version 52 */
/* $Log$
* Revision 1.1 2000/01/05 08:20:40 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:40 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.2 1996/08/20 20:45:00 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_encoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_encoder_state().
*
* Revision 1.1 1996/08/19 22:30:14 jaf
* Initial revision
* */
/* Revision 1.10 1996/03/29 17:59:14 jaf */
/* Avoided using VALUE(9), although it shouldn't affect the function of */
/* the code at all, because it was always multiplied by VDC(9,SNRL), */
/* which is 0 for all values of SNRL. Still, if VALUE(9) had an initial */
/* value of IEEE NaN, it might cause trouble (I don't know how IEEE */
/* defines Nan * 0. It should either be NaN or 0.) */
/* Revision 1.9 1996/03/29 17:54:46 jaf */
/* Added a few comments about the accesses made to argument array VOIBUF */
/* and the local saved array VOICE. */
/* Revision 1.8 1996/03/27 18:19:54 jaf */
/* Added an assignment to VSTATE that does not affect the function of the */
/* program at all. The only reason I put it in was so that the tracing */
/* statements at the end, when enabled, will print a consistent value for */
/* VSTATE when HALF .EQ. 1, rather than a garbage value that could change */
/* from one call to the next. */
/* Revision 1.7 1996/03/26 20:00:06 jaf */
/* Removed the inclusion of the file "vcomm.fh", and put its contents */
/* into this file. It was included nowhere else but here. */
/* Revision 1.6 1996/03/26 19:38:09 jaf */
/* Commented out trace statements. */
/* Revision 1.5 1996/03/19 20:43:45 jaf */
/* Added comments about which indices of OBOUND and VOIBUF can be */
/* accessed, and whether they are read or written. VOIBUF is fairly */
/* messy. */
/* Revision 1.4 1996/03/19 15:00:58 jaf */
/* Moved the DATA statements for the *VDC* variables later, as it is */
/* apparently illegal to have DATA statements before local variable */
/* declarations. */
/* Revision 1.3 1996/03/19 00:10:49 jaf */
/* Heavily commented the local variables that are saved from one */
/* invocation to the next, and how the local variable FIRST is used to */
/* avoid the need to assign most of them initial values with DATA */
/* statements. */
/* A few should be initialized, but aren't. I've guessed initial values */
/* for two of these, SFBUE and SLBUE, and I've convinced myself that for */
/* VOICE, the effects of uninitialized values will die out after 2 or 3 */
/* frame times. It would still be good to choose initial values for */
/* these, but I don't know what reasonable values would be (0 comes to */
/* mind). */
/* Revision 1.2 1996/03/13 16:09:28 jaf */
/* Comments added explaining which of the local variables of this */
/* subroutine need to be saved from one invocation to the next, and which */
/* do not. */
/* WARNING! Some of them that should are never given initial values in */
/* this code. Hopefully, Fortran 77 defines initial values for them, but */
/* even so, giving them explicit initial values is preferable. */
/* WARNING! VALUE(9) is used, but never assigned a value. It should */
/* probably be eliminated from the code. */
/* Revision 1.1 1996/02/07 14:50:28 jaf */
/* Initial revision */
/****************************************************************************/
/* Voicing Detection (VOICIN) makes voicing decisions for each half */
/* frame of input speech. Tentative voicing decisions are made two frames*/
/* in the future (2F) for each half frame. These decisions are carried */
/* through one frame in the future (1F) to the present (P) frame where */
/* they are examined and smoothed, resulting in the final voicing */
/* decisions for each half frame. */
/* The voicing parameter (signal measurement) column vector (VALUE) */
/* is based on a rectangular window of speech samples determined by the */
/* window placement algorithm. The voicing parameter vector contains the*/
/* AMDF windowed maximum-to-minimum ratio, the zero crossing rate, energy*/
/* measures, reflection coefficients, and prediction gains. The voicing */
/* window is placed to avoid contamination of the voicing parameter vector*/
/* with speech onsets. */
/* The input signal is then classified as unvoiced (including */
/* silence) or voiced. This decision is made by a linear discriminant */
/* function consisting of a dot product of the voicing decision */
/* coefficient (VDC) row vector with the measurement column vector */
/* (VALUE). The VDC vector is 2-dimensional, each row vector is optimized*/
/* for a particular signal-to-noise ratio (SNR). So, before the dot */
/* product is performed, the SNR is estimated to select the appropriate */
/* VDC vector. */
/* The smoothing algorithm is a modified median smoother. The */
/* voicing discriminant function is used by the smoother to determine how*/
/* strongly voiced or unvoiced a signal is. The smoothing is further */
/* modified if a speech onset and a voicing decision transition occur */
/* within one half frame. In this case, the voicing decision transition */
/* is extended to the speech onset. For transmission purposes, there are*/
/* constraints on the duration and transition of voicing decisions. The */
/* smoother takes these constraints into account. */
/* Finally, the energy estimates are updated along with the dither */
/* threshold used to calculate the zero crossing rate (ZC). */
/* Inputs: */
/* VWIN - Voicing window limits */
/* The indices read of arrays VWIN, INBUF, LPBUF, and BUFLIM */
/* are the same as those read by subroutine VPARMS. */
/* INBUF - Input speech buffer */
/* LPBUF - Low-pass filtered speech buffer */
/* BUFLIM - INBUF and LPBUF limits */
/* HALF - Present analysis half frame number */
/* MINAMD - Minimum value of the AMDF */
/* MAXAMD - Maximum value of the AMDF */
/* MINTAU - Pointer to the lag of the minimum AMDF value */
/* IVRC(2) - Inverse filter's RC's */
/* Only index 2 of array IVRC read under normal operation. */
/* (Index 1 is also read when debugging is turned on.) */
/* OBOUND - Onset boundary descriptions */
/* Indices 1 through 3 read if (HALF .NE. 1), otherwise untouched.
*/
/* AF - The analysis frame number */
/* Output: */
/* VOIBUF(2,0:AF) - Buffer of voicing decisions */
/* Index (HALF,3) written. */
/* If (HALF .EQ. 1), skip down to "Read (HALF,3)" below. */
/* Indices (1,2), (2,1), (1,2), and (2,2) read. */
/* One of the following is then done: */
/* read (1,3) and possibly write (1,2) */
/* read (1,3) and write (1,2) or (2,2) */
/* write (2,1) */
/* write (2,1) or (1,2) */
/* read (1,0) and (1,3) and then write (2,2) or (1,1) */
/* no reads or writes on VOIBUF */
/* Finally, read (HALF,3) */
/* Internal: */
/* QS - Ratio of preemphasized to full-band energies */
/* RC1 - First reflection coefficient */
/* AR_B - Product of the causal forward and reverse pitch prediction gain
s*/
/* AR_F - Product of the noncausal forward and rev. pitch prediction gain
s*/
/* ZC - Zero crossing rate */
/* DITHER - Zero crossing threshold level */
/* MAXMIN - AMDF's 1 octave windowed maximum-to-minimum ratio */
/* MINPTR - Location of minimum AMDF value */
/* NVDC - Number of elements in each VDC vector */
/* NVDCL - Number of VDC vectors */
/* VDCL - SNR values corresponding to the set of VDC's */
/* VDC - 2-D voicing decision coefficient vector */
/* VALUE(9) - Voicing Parameters */
/* VOICE(2,3)- History of LDA results */
/* On every call when (HALF .EQ. 1), VOICE(*,I+1) is */
/* shifted back to VOICE(*,I), for I=1,2. */
/* VOICE(HALF,3) is written on every call. */
/* Depending on several conditions, one or more of */
/* (1,1), (1,2), (2,1), and (2,2) might then be read. */
/* LBE - Ratio of low-band instantaneous to average energies */
/* FBE - Ratio of full-band instantaneous to average energies */
/* LBVE - Low band voiced energy */
/* LBUE - Low band unvoiced energy */
/* FBVE - Full band voiced energy */
/* FBUE - Full band unvoiced energy */
/* OFBUE - Previous full-band unvoiced energy */
/* OLBUE - Previous low-band unvoiced energy */
/* REF - Reference energy for initialization and DITHER threshold */
/* SNR - Estimate of signal-to-noise ratio */
/* SNR2 - Estimate of low-band signal-to-noise ratio */
/* SNRL - SNR level number */
/* OT - Onset transition present */
/* VSTATE - Decimal interpretation of binary voicing classifications */
/* FIRST - First call flag */
/* This subroutine maintains local state from one call to the next. If */
/* you want to switch to using a new audio stream for this filter, or */
/* reinitialize its state for any other reason, call the ENTRY */
/* INITVOICIN. */
/* Subroutine */ int voicin_(integer *vwin, real *inbuf, real *
lpbuf, integer *buflim, integer *half, real *minamd, real *maxamd,
integer *mintau, real *ivrc, integer *obound, integer *voibuf,
integer *af, struct lpc10_encoder_state *st)
{
/* Initialized data */
real *dither;
static real vdc[100] /* was [10][10] */ = { 0.f,1714.f,-110.f,
334.f,-4096.f,-654.f,3752.f,3769.f,0.f,1181.f,0.f,874.f,-97.f,
300.f,-4096.f,-1021.f,2451.f,2527.f,0.f,-500.f,0.f,510.f,-70.f,
250.f,-4096.f,-1270.f,2194.f,2491.f,0.f,-1500.f,0.f,500.f,-10.f,
200.f,-4096.f,-1300.f,2e3f,2e3f,0.f,-2e3f,0.f,500.f,0.f,0.f,
-4096.f,-1300.f,2e3f,2e3f,0.f,-2500.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,
0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,
0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,
0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f };
static integer nvdcl = 5;
static real vdcl[10] = { 600.f,450.f,300.f,200.f,0.f,0.f,0.f,0.f,0.f,0.f }
;
/* System generated locals */
integer inbuf_offset, lpbuf_offset, i__1, i__2;
real r__1, r__2;
/* Builtin functions */
integer i_nint(real *);
double sqrt(doublereal);
/* Local variables */
real ar_b__, ar_f__;
integer *lbve, *lbue, *fbve, *fbue;
integer snrl, i__;
integer *ofbue, *sfbue;
real *voice;
integer *olbue, *slbue;
real value[9];
integer zc;
logical ot;
real qs;
real *maxmin;
integer vstate;
real rc1;
extern /* Subroutine */ int vparms_(integer *, real *, real *, integer *,
integer *, real *, integer *, integer *, integer *, integer *,
real *, real *, real *, real *);
integer fbe, lbe;
real *snr;
real snr2;
/* Global Variables: */
/* Arguments */
/* $Log$
* Revision 1.1 2000/01/05 08:20:40 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:40 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.2 1996/08/20 20:45:00 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_encoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_encoder_state().
*
* Revision 1.1 1996/08/19 22:30:14 jaf
* Initial revision
* */
/* Revision 1.3 1996/03/29 22:05:55 jaf */
/* Commented out the common block variables that are not needed by the */
/* embedded version. */
/* Revision 1.2 1996/03/26 19:34:50 jaf */
/* Added comments indicating which constants are not needed in an */
/* application that uses the LPC-10 coder. */
/* Revision 1.1 1996/02/07 14:44:09 jaf */
/* Initial revision */
/* LPC Processing control variables: */
/* *** Read-only: initialized in setup */
/* Files for Speech, Parameter, and Bitstream Input & Output, */
/* and message and debug outputs. */
/* Here are the only files which use these variables: */
/* lpcsim.f setup.f trans.f error.f vqsetup.f */
/* Many files which use fdebug are not listed, since it is only used in */
/* those other files conditionally, to print trace statements. */
/* integer fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
/* LPC order, Frame size, Quantization rate, Bits per frame, */
/* Error correction */
/* Subroutine SETUP is the only place where order is assigned a value, */
/* and that value is 10. It could increase efficiency 1% or so to */
/* declare order as a constant (i.e., a Fortran PARAMETER) instead of as
*/
/* a variable in a COMMON block, since it is used in many places in the */
/* core of the coding and decoding routines. Actually, I take that back.
*/
/* At least when compiling with f2c, the upper bound of DO loops is */
/* stored in a local variable before the DO loop begins, and then that is
*/
/* compared against on each iteration. */
/* Similarly for lframe, which is given a value of MAXFRM in SETUP. */
/* Similarly for quant, which is given a value of 2400 in SETUP. quant */
/* is used in only a few places, and never in the core coding and */
/* decoding routines, so it could be eliminated entirely. */
/* nbits is similar to quant, and is given a value of 54 in SETUP. */
/* corrp is given a value of .TRUE. in SETUP, and is only used in the */
/* subroutines ENCODE and DECODE. It doesn't affect the speed of the */
/* coder significantly whether it is .TRUE. or .FALSE., or whether it is
*/
/* a constant or a variable, since it is only examined once per frame. */
/* Leaving it as a variable that is set to .TRUE. seems like a good */
/* idea, since it does enable some error-correction capability for */
/* unvoiced frames, with no change in the coding rate, and no noticeable
*/
/* quality difference in the decoded speech. */
/* integer quant, nbits */
/* *** Read/write: variables for debugging, not needed for LPC algorithm
*/
/* Current frame, Unstable frames, Output clip count, Max onset buffer,
*/
/* Debug listing detail level, Line count on listing page */
/* nframe is not needed for an embedded LPC10 at all. */
/* nunsfm is initialized to 0 in SETUP, and incremented in subroutine */
/* ERROR, which is only called from RCCHK. When LPC10 is embedded into */
/* an application, I would recommend removing the call to ERROR in RCCHK,
*/
/* and remove ERROR and nunsfm completely. */
/* iclip is initialized to 0 in SETUP, and incremented in entry SWRITE in
*/
/* sread.f. When LPC10 is embedded into an application, one might want */
/* to cause it to be incremented in a routine that takes the output of */
/* SYNTHS and sends it to an audio device. It could be optionally */
/* displayed, for those that might want to know what it is. */
/* maxosp is never initialized to 0 in SETUP, although it probably should
*/
/* be, and it is updated in subroutine ANALYS. I doubt that its value */
/* would be of much interest to an application in which LPC10 is */
/* embedded. */
/* listl and lincnt are not needed for an embedded LPC10 at all. */
/* integer nframe, nunsfm, iclip, maxosp, listl, lincnt */
/* common /contrl/ fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
/* common /contrl/ quant, nbits */
/* common /contrl/ nframe, nunsfm, iclip, maxosp, listl, lincnt */
/* Parameters/constants */
/* Voicing coefficient and Linear Discriminant Analysis variables:
*/
/* Max number of VDC's and VDC levels */
/* The following are not Fortran PARAMETER's, but they are */
/* initialized with DATA statements, and never modified. */
/* Actual number of VDC's and levels */
/* Local variables that need not be saved */
/* Note: */
/* VALUE(1) through VALUE(8) are assigned values, but VALUE(9) */
/* never is. Yet VALUE(9) is read in the loop that begins "DO I =
*/
/* 1, 9" below. I believe that this doesn't cause any problems in
*/
/* this subroutine, because all VDC(9,*) array elements are 0, and
*/
/* this is what is multiplied by VALUE(9) in all cases. Still, it
*/
/* would save a multiplication to change the loop to "DO I = 1, 8".
*/
/* Local state */
/* WARNING! */
/* VOICE, SFBUE, and SLBUE should be saved from one invocation to */
/* the next, but they are never given an initial value. */
/* Does Fortran 77 specify some default initial value, like 0, or */
/* is it undefined? If it is undefined, then this code should be */
/* corrected to specify an initial value. */
/* For VOICE, note that it is "shifted" in the statement that */
/* begins "IF (HALF .EQ. 1) THEN" below. Also, uninitialized */
/* values in the VOICE array can only affect entries in the VOIBUF
*/
/* array that are for the same frame, or for an older frame. Thus
*/
/* the effects of uninitialized values in VOICE cannot linger on */
/* for more than 2 or 3 frame times. */
/* For SFBUE and SLBUE, the effects of uninitialized values can */
/* linger on for many frame times, because their previous values */
/* are exponentially decayed. Thus it is more important to choose
*/
/* initial values for these variables. I would guess that a */
/* reasonable initial value for SFBUE is REF/16, the same as used */
/* for FBUE and OFBUE. Similarly, SLBUE can be initialized to */
/* REF/32, the same as for LBUE and OLBUE. */
/* These guessed initial values should be validated by re-running */
/* the modified program on some audio samples. */
/* Declare and initialize filters: */
dither = (&st->dither);
snr = (&st->snr);
maxmin = (&st->maxmin);
voice = (&st->voice[0]);
lbve = (&st->lbve);
lbue = (&st->lbue);
fbve = (&st->fbve);
fbue = (&st->fbue);
ofbue = (&st->ofbue);
olbue = (&st->olbue);
sfbue = (&st->sfbue);
slbue = (&st->slbue);
/* Parameter adjustments */
if (vwin) {
--vwin;
}
if (buflim) {
--buflim;
}
if (inbuf) {
inbuf_offset = buflim[1];
inbuf -= inbuf_offset;
}
if (lpbuf) {
lpbuf_offset = buflim[3];
lpbuf -= lpbuf_offset;
}
if (ivrc) {
--ivrc;
}
if (obound) {
--obound;
}
if (voibuf) {
--voibuf;
}
/* Function Body */
/* The following variables are saved from one invocation to the */
/* next, but are not initialized with DATA statements. This is */
/* acceptable, because FIRST is initialized ot .TRUE., and the */
/* first time that this subroutine is then called, they are all */
/* given initial values. */
/* SNR */
/* LBVE, LBUE, FBVE, FBUE, OFBUE, OLBUE */
/* MAXMIN is initialized on the first call, assuming that HALF */
/* .EQ. 1 on first call. This is how ANALYS calls this subroutine.
*/
/* Voicing Decision Parameter vector (* denotes zero coefficient): */
/* * MAXMIN */
/* LBE/LBVE */
/* ZC */
/* RC1 */
/* QS */
/* IVRC2 */
/* aR_B */
/* aR_F */
/* * LOG(LBE/LBVE) */
/* Define 2-D voicing decision coefficient vector according to the voicin
g*/
/* parameter order above. Each row (VDC vector) is optimized for a speci
fic*/
/* SNR. The last element of the vector is the constant. */
/* E ZC RC1 Qs IVRC2 aRb aRf c */
/* The VOICE array contains the result of the linear discriminant functio
n*/
/* (analog values). The VOIBUF array contains the hard-limited binary
*/
/* voicing decisions. The VOICE and VOIBUF arrays, according to FORTRAN
*/
/* memory allocation, are addressed as: */
/* (half-frame number, future-frame number) */
/* | Past | Present | Future1 | Future2 | */
/* | 1,0 | 2,0 | 1,1 | 2,1 | 1,2 | 2,2 | 1,3 | 2,3 | ---> time */
/* Update linear discriminant function history each frame: */
if (*half == 1) {
voice[0] = voice[2];
voice[1] = voice[3];
voice[2] = voice[4];
voice[3] = voice[5];
*maxmin = *maxamd / max(*minamd,1.f);
}
/* Calculate voicing parameters twice per frame: */
vparms_(&vwin[1], &inbuf[inbuf_offset], &lpbuf[lpbuf_offset], &buflim[1],
half, dither, mintau, &zc, &lbe, &fbe, &qs, &rc1, &ar_b__, &
ar_f__);
/* Estimate signal-to-noise ratio to select the appropriate VDC vector.
*/
/* The SNR is estimated as the running average of the ratio of the */
/* running average full-band voiced energy to the running average */
/* full-band unvoiced energy. SNR filter has gain of 63. */
r__1 = (*snr + *fbve / (real) max(*fbue,1)) * 63 / 64.f;
*snr = (real) i_nint(&r__1);
snr2 = *snr * *fbue / max(*lbue,1);
/* Quantize SNR to SNRL according to VDCL thresholds. */
snrl = 1;
i__1 = nvdcl - 1;
for (snrl = 1; snrl <= i__1; ++snrl) {
if (snr2 > vdcl[snrl - 1]) {
goto L69;
}
}
/* (Note: SNRL = NVDCL here) */
L69:
/* Linear discriminant voicing parameters: */
value[0] = *maxmin;
value[1] = (real) lbe / max(*lbve,1);
value[2] = (real) zc;
value[3] = rc1;
value[4] = qs;
value[5] = ivrc[2];
value[6] = ar_b__;
value[7] = ar_f__;
/* Evaluation of linear discriminant function: */
voice[*half + 3] = vdc[snrl * 10 - 1];
for (i__ = 1; i__ <= 8; ++i__) {
voice[*half + 3] += vdc[i__ + snrl * 10 - 11] * value[i__ - 1];
}
/* Classify as voiced if discriminant > 0, otherwise unvoiced */
/* Voicing decision for current half-frame: 1 = Voiced; 0 = Unvoiced */
if (voice[*half + 3] > 0.f) {
voibuf[*half + 6] = 1;
} else {
voibuf[*half + 6] = 0;
}
/* Skip voicing decision smoothing in first half-frame: */
/* Give a value to VSTATE, so that trace statements below will print
*/
/* a consistent value from one call to the next when HALF .EQ. 1. */
/* The value of VSTATE is not used for any other purpose when this is
*/
/* true. */
vstate = -1;
if (*half == 1) {
goto L99;
}
/* Voicing decision smoothing rules (override of linear combination): */
/* Unvoiced half-frames: At least two in a row. */
/* -------------------- */
/* Voiced half-frames: At least two in a row in one frame. */
/* ------------------- Otherwise at least three in a row. */
/* (Due to the way transition frames are encoded) */
/* In many cases, the discriminant function determines how to smooth. */
/* In the following chart, the decisions marked with a * may be overridden
.*/
/* Voicing override of transitions at onsets: */
/* If a V/UV or UV/V voicing decision transition occurs within one-half
*/
/* frame of an onset bounding a voicing window, then the transition is */
/* moved to occur at the onset. */
/* P 1F */
/* ----- ----- */
/* 0 0 0 0 */
/* 0 0 0* 1 (If there is an onset there) */
/* 0 0 1* 0* (Based on 2F and discriminant distance) */
/* 0 0 1 1 */
/* 0 1* 0 0 (Always) */
/* 0 1* 0* 1 (Based on discriminant distance) */
/* 0* 1 1 0* (Based on past, 2F, and discriminant distance) */
/* 0 1* 1 1 (If there is an onset there) */
/* 1 0* 0 0 (If there is an onset there) */
/* 1 0 0 1 */
/* 1 0* 1* 0 (Based on discriminant distance) */
/* 1 0* 1 1 (Always) */
/* 1 1 0 0 */
/* 1 1 0* 1* (Based on 2F and discriminant distance) */
/* 1 1 1* 0 (If there is an onset there) */
/* 1 1 1 1 */
/* Determine if there is an onset transition between P and 1F. */
/* OT (Onset Transition) is true if there is an onset between */
/* P and 1F but not after 1F. */
ot = ((obound[1] & 2) != 0 || obound[2] == 1) && (obound[3] & 1) == 0;
/* Multi-way dispatch on voicing decision history: */
vstate = (voibuf[3] << 3) + (voibuf[4] << 2) + (voibuf[5] << 1) + voibuf[
6];
switch (vstate + 1) {
case 1: goto L99;
case 2: goto L1;
case 3: goto L2;
case 4: goto L99;
case 5: goto L4;
case 6: goto L5;
case 7: goto L6;
case 8: goto L7;
case 9: goto L8;
case 10: goto L99;
case 11: goto L10;
case 12: goto L11;
case 13: goto L99;
case 14: goto L13;
case 15: goto L14;
case 16: goto L99;
}
L1:
if (ot && voibuf[7] == 1) {
voibuf[5] = 1;
}
goto L99;
L2:
if (voibuf[7] == 0 || voice[2] < -voice[3]) {
voibuf[5] = 0;
} else {
voibuf[6] = 1;
}
goto L99;
L4:
voibuf[4] = 0;
goto L99;
L5:
if (voice[1] < -voice[2]) {
voibuf[4] = 0;
} else {
voibuf[5] = 1;
}
goto L99;
/* VOIBUF(2,0) must be 0 */
L6:
if (voibuf[1] == 1 || voibuf[7] == 1 || voice[3] > voice[0]) {
voibuf[6] = 1;
} else {
voibuf[3] = 1;
}
goto L99;
L7:
if (ot) {
voibuf[4] = 0;
}
goto L99;
L8:
if (ot) {
voibuf[4] = 1;
}
goto L99;
L10:
if (voice[2] < -voice[1]) {
voibuf[5] = 0;
} else {
voibuf[4] = 1;
}
goto L99;
L11:
voibuf[4] = 1;
goto L99;
L13:
if (voibuf[7] == 0 && voice[3] < -voice[2]) {
voibuf[6] = 0;
} else {
voibuf[5] = 1;
}
goto L99;
L14:
if (ot && voibuf[7] == 0) {
voibuf[5] = 0;
}
/* GOTO 99 */
L99:
/* Now update parameters: */
/* ---------------------- */
/* During unvoiced half-frames, update the low band and full band unvoice
d*/
/* energy estimates (LBUE and FBUE) and also the zero crossing */
/* threshold (DITHER). (The input to the unvoiced energy filters is */
/* restricted to be less than 10dB above the previous inputs of the */
/* filters.) */
/* During voiced half-frames, update the low-pass (LBVE) and all-pass */
/* (FBVE) voiced energy estimates. */
if (voibuf[*half + 6] == 0) {
/* Computing MIN */
i__1 = fbe, i__2 = *ofbue * 3;
r__1 = (*sfbue * 63 + (min(i__1,i__2) << 3)) / 64.f;
*sfbue = i_nint(&r__1);
*fbue = *sfbue / 8;
*ofbue = fbe;
/* Computing MIN */
i__1 = lbe, i__2 = *olbue * 3;
r__1 = (*slbue * 63 + (min(i__1,i__2) << 3)) / 64.f;
*slbue = i_nint(&r__1);
*lbue = *slbue / 8;
*olbue = lbe;
} else {
r__1 = (*lbve * 63 + lbe) / 64.f;
*lbve = i_nint(&r__1);
r__1 = (*fbve * 63 + fbe) / 64.f;
*fbve = i_nint(&r__1);
}
/* Set dither threshold to yield proper zero crossing rates in the */
/* presence of low frequency noise and low level signal input. */
/* NOTE: The divisor is a function of REF, the expected energies. */
/* Computing MIN */
/* Computing MAX */
r__2 = sqrt((real) (*lbue * *lbve)) * 64 / 3000;
r__1 = max(r__2,1.f);
*dither = min(r__1,20.f);
/* Voicing decisions are returned in VOIBUF. */
return 0;
} /* voicin_ */

243
codecs/lpc10/vparms.c Executable file
View File

@@ -0,0 +1,243 @@
/*
$Log$
Revision 1.1 2000/01/05 08:20:40 markster
Version 0.1.2 from FTP
Revision 1.2 2000/01/05 08:20:40 markster
Some OSS fixes and a few lpc changes to make it actually work
* Revision 1.1 1996/08/19 22:30:04 jaf
* Initial revision
*
*/
#ifdef P_R_O_T_O_T_Y_P_E_S
extern int vparms_(integer *vwin, real *inbuf, real *lpbuf, integer *buflim, integer *half, real *dither, integer *mintau, integer *zc, integer *lbe, integer *fbe, real *qs, real *rc1, real *ar_b__, real *ar_f__);
#endif
/* -- translated by f2c (version 19951025).
You must link the resulting object file with the libraries:
-lf2c -lm (in that order)
*/
#include "f2c.h"
/* Table of constant values */
static real c_b2 = 1.f;
/* ********************************************************************* */
/* VPARMS Version 50 */
/* $Log$
* Revision 1.1 2000/01/05 08:20:40 markster
* Version 0.1.2 from FTP
*
/* Revision 1.2 2000/01/05 08:20:40 markster
/* Some OSS fixes and a few lpc changes to make it actually work
/*
* Revision 1.1 1996/08/19 22:30:04 jaf
* Initial revision
* */
/* Revision 1.6 1996/03/29 18:01:16 jaf */
/* Added some more comments about the range of INBUF and LPBUF that can */
/* be read. Note that it is possible for index VWIN(2)+1 to be read from */
/* INBUF, which might be outside of its defined range, although that will */
/* require more careful checking. */
/* Revision 1.5 1996/03/19 00:02:02 jaf */
/* I just noticed that the argument DITHER is modified inside of this */
/* subroutine. Comments were added explaining the possible final values. */
/* Revision 1.4 1996/03/18 22:22:59 jaf */
/* Finishing the job I said I did with the last check-in comments. */
/* Revision 1.3 1996/03/18 22:22:17 jaf */
/* Just added a few comments about which array indices of the arguments */
/* are used, and mentioning that this subroutine has no local state. */
/* Revision 1.2 1996/03/13 15:02:58 jaf */
/* Comments added explaining that none of the local variables of this */
/* subroutine need to be saved from one invocation to the next. */
/* Revision 1.1 1996/02/07 14:50:42 jaf */
/* Initial revision */
/* ********************************************************************* */
/* Calculate voicing parameters: */
/* Input: */
/* VWIN - Voicing window limits */
/* Indices 1 through 2 read. */
/* INBUF - Input speech buffer */
/* Indices START-1 through STOP read, */
/* where START and STOP are defined in the code (only written once).
*/
/* Note that STOP can be as large as VWIN(2)+1 ! */
/* LPBUF - Low pass filtered speech */
/* Indices START-MINTAU through STOP+MINTAU read, */
/* where START and STOP are defined in the code (only written once).
*/
/* BUFLIM - Array bounds for INBUF and LPBUF */
/* Indices 1 through 4 read. */
/* HALF - Half frame (1 or 2) */
/* MINTAU - Lag corresponding to minimum AMDF value (pitch estimate) */
/* Input/Output: */
/* DITHER - Zero crossing threshold */
/* The resulting value might be the negation of the input */
/* value. It might always be the same as the input value, */
/* if the DO loop below always executes an even number of times. */
/* Output: (all of them are written on every call) */
/* ZC - Zero crossing rate */
/* LBE - Low band energy (sum of magnitudes - SM) */
/* FBE - Full band energy (SM) */
/* QS - Ratio of 6 dB/oct preemphasized energy to full band energy */
/* RC1 - First reflection coefficient */
/* AR_B - Product of the causal forward and reverse pitch */
/* prediction gains */
/* AR_F - Product of the noncausal forward and reverse pitch */
/* prediction gains */
/* Internal: */
/* OLDSGN - Previous sign of dithered signal */
/* VLEN - Length of voicing window */
/* START - Lower address of current half of voicing window */
/* STOP - Upper address of current half of voicing window */
/* E_0 - Energy of LPF speech (sum of squares - SS) */
/* E_B - Energy of LPF speech backward one pitch period (SS) */
/* E_F - Energy of LPF speech forward one pitch period (SS) */
/* R_B - Autocovariance of LPF speech backward one pitch period */
/* R_F - Autocovariance of LPF speech forward one pitch period */
/* LP_RMS - Energy of LPF speech (sum of magnitudes - SM) */
/* AP_RMS - Energy of all-pass speech (SM) */
/* E_PRE - Energy of 6dB preemphasized speech (SM) */
/* E0AP - Energy of all-pass speech (SS) */
/* This subroutine has no local state. */
/* Subroutine */ int vparms_(integer *vwin, real *inbuf, real *lpbuf, integer
*buflim, integer *half, real *dither, integer *mintau, integer *zc,
integer *lbe, integer *fbe, real *qs, real *rc1, real *ar_b__, real *
ar_f__)
{
/* System generated locals */
integer inbuf_offset, lpbuf_offset, i__1;
real r__1, r__2;
/* Builtin functions */
double r_sign(real *, real *);
integer i_nint(real *);
/* Local variables */
integer vlen, stop, i__;
real e_pre__;
integer start;
real ap_rms__, e_0__, oldsgn, lp_rms__, e_b__, e_f__, r_b__, r_f__, e0ap;
/* Arguments */
/* Local variables that need not be saved */
/* Calculate zero crossings (ZC) and several energy and correlation */
/* measures on low band and full band speech. Each measure is taken */
/* over either the first or the second half of the voicing window, */
/* depending on the variable HALF. */
/* Parameter adjustments */
--vwin;
--buflim;
lpbuf_offset = buflim[3];
lpbuf -= lpbuf_offset;
inbuf_offset = buflim[1];
inbuf -= inbuf_offset;
/* Function Body */
lp_rms__ = 0.f;
ap_rms__ = 0.f;
e_pre__ = 0.f;
e0ap = 0.f;
*rc1 = 0.f;
e_0__ = 0.f;
e_b__ = 0.f;
e_f__ = 0.f;
r_f__ = 0.f;
r_b__ = 0.f;
*zc = 0;
vlen = vwin[2] - vwin[1] + 1;
start = vwin[1] + (*half - 1) * vlen / 2 + 1;
stop = start + vlen / 2 - 1;
/* I'll use the symbol HVL in the table below to represent the value */
/* VLEN/2. Note that if VLEN is odd, then HVL should be rounded down, */
/* i.e., HVL = (VLEN-1)/2. */
/* HALF START STOP */
/* 1 VWIN(1)+1 VWIN(1)+HVL */
/* 2 VWIN(1)+HVL+1 VWIN(1)+2*HVL */
/* Note that if VLEN is even and HALF is 2, then STOP will be */
/* VWIN(1)+VLEN = VWIN(2)+1. That could be bad, if that index of INBUF */
/* is undefined. */
r__1 = inbuf[start - 1] - *dither;
oldsgn = r_sign(&c_b2, &r__1);
i__1 = stop;
for (i__ = start; i__ <= i__1; ++i__) {
lp_rms__ += (r__1 = lpbuf[i__], abs(r__1));
ap_rms__ += (r__1 = inbuf[i__], abs(r__1));
e_pre__ += (r__1 = inbuf[i__] - inbuf[i__ - 1], abs(r__1));
/* Computing 2nd power */
r__1 = inbuf[i__];
e0ap += r__1 * r__1;
*rc1 += inbuf[i__] * inbuf[i__ - 1];
/* Computing 2nd power */
r__1 = lpbuf[i__];
e_0__ += r__1 * r__1;
/* Computing 2nd power */
r__1 = lpbuf[i__ - *mintau];
e_b__ += r__1 * r__1;
/* Computing 2nd power */
r__1 = lpbuf[i__ + *mintau];
e_f__ += r__1 * r__1;
r_f__ += lpbuf[i__] * lpbuf[i__ + *mintau];
r_b__ += lpbuf[i__] * lpbuf[i__ - *mintau];
r__1 = inbuf[i__] + *dither;
if (r_sign(&c_b2, &r__1) != oldsgn) {
++(*zc);
oldsgn = -oldsgn;
}
*dither = -(*dither);
}
/* Normalized short-term autocovariance coefficient at unit sample delay
*/
*rc1 /= max(e0ap,1.f);
/* Ratio of the energy of the first difference signal (6 dB/oct preemphas
is)*/
/* to the energy of the full band signal */
/* Computing MAX */
r__1 = ap_rms__ * 2.f;
*qs = e_pre__ / max(r__1,1.f);
/* aR_b is the product of the forward and reverse prediction gains, */
/* looking backward in time (the causal case). */
*ar_b__ = r_b__ / max(e_b__,1.f) * (r_b__ / max(e_0__,1.f));
/* aR_f is the same as aR_b, but looking forward in time (non causal case
).*/
*ar_f__ = r_f__ / max(e_f__,1.f) * (r_f__ / max(e_0__,1.f));
/* Normalize ZC, LBE, and FBE to old fixed window length of 180. */
/* (The fraction 90/VLEN has a range of .58 to 1) */
r__2 = (real) (*zc << 1);
r__1 = r__2 * (90.f / vlen);
*zc = i_nint(&r__1);
/* Computing MIN */
r__1 = lp_rms__ / 4 * (90.f / vlen);
i__1 = i_nint(&r__1);
*lbe = min(i__1,32767);
/* Computing MIN */
r__1 = ap_rms__ / 4 * (90.f / vlen);
i__1 = i_nint(&r__1);
*fbe = min(i__1,32767);
return 0;
} /* vparms_ */