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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@3997 65c4cc65-6c06-0410-ace0-fbb531ad65f3
202 lines
5.6 KiB
C
Executable File
202 lines
5.6 KiB
C
Executable File
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/******************************************************************
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iLBC Speech Coder ANSI-C Source Code
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iLBC_define.h
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Copyright (C) The Internet Society (2004).
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All Rights Reserved.
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******************************************************************/
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#include <string.h>
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#ifndef __iLBC_ILBCDEFINE_H
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#define __iLBC_ILBCDEFINE_H
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/* general codec settings */
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#define FS (float)8000.0
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#define BLOCKL_20MS 160
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#define BLOCKL_30MS 240
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#define BLOCKL_MAX 240
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#define NSUB_20MS 4
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#define NSUB_30MS 6
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#define NSUB_MAX 6
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#define NASUB_20MS 2
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#define NASUB_30MS 4
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#define NASUB_MAX 4
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#define SUBL 40
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#define STATE_LEN 80
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#define STATE_SHORT_LEN_30MS 58
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#define STATE_SHORT_LEN_20MS 57
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/* LPC settings */
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#define LPC_FILTERORDER 10
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#define LPC_CHIRP_SYNTDENUM (float)0.9025
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#define LPC_CHIRP_WEIGHTDENUM (float)0.4222
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#define LPC_LOOKBACK 60
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#define LPC_N_20MS 1
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#define LPC_N_30MS 2
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#define LPC_N_MAX 2
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#define LPC_ASYMDIFF 20
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#define LPC_BW (float)60.0
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#define LPC_WN (float)1.0001
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#define LSF_NSPLIT 3
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#define LSF_NUMBER_OF_STEPS 4
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#define LPC_HALFORDER (LPC_FILTERORDER/2)
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/* cb settings */
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#define CB_NSTAGES 3
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#define CB_EXPAND 2
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#define CB_MEML 147
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#define CB_FILTERLEN 2*4
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#define CB_HALFFILTERLEN 4
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#define CB_RESRANGE 34
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#define CB_MAXGAIN (float)1.3
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/* enhancer */
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#define ENH_BLOCKL 80 /* block length */
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#define ENH_BLOCKL_HALF (ENH_BLOCKL/2)
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#define ENH_HL 3 /* 2*ENH_HL+1 is number blocks
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in said second sequence */
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#define ENH_SLOP 2 /* max difference estimated and
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correct pitch period */
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#define ENH_PLOCSL 20 /* pitch-estimates and pitch-
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locations buffer length */
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#define ENH_OVERHANG 2
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#define ENH_UPS0 4 /* upsampling rate */
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#define ENH_FL0 3 /* 2*FLO+1 is the length of
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each filter */
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#define ENH_VECTL (ENH_BLOCKL+2*ENH_FL0)
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#define ENH_CORRDIM (2*ENH_SLOP+1)
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#define ENH_NBLOCKS (BLOCKL_MAX/ENH_BLOCKL)
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#define ENH_NBLOCKS_EXTRA 5
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#define ENH_NBLOCKS_TOT 8 /* ENH_NBLOCKS +
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ENH_NBLOCKS_EXTRA */
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#define ENH_BUFL (ENH_NBLOCKS_TOT)*ENH_BLOCKL
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#define ENH_ALPHA0 (float)0.05
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/* Down sampling */
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#define FILTERORDER_DS 7
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#define DELAY_DS 3
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#define FACTOR_DS 2
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/* bit stream defs */
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#define NO_OF_BYTES_20MS 38
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#define NO_OF_BYTES_30MS 50
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#define NO_OF_WORDS_20MS 19
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#define NO_OF_WORDS_30MS 25
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#define STATE_BITS 3
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#define BYTE_LEN 8
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#define ULP_CLASSES 3
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/* help parameters */
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#define FLOAT_MAX (float)1.0e37
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#define EPS (float)2.220446049250313e-016
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#define PI (float)3.14159265358979323846
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#define MIN_SAMPLE -32768
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#define MAX_SAMPLE 32767
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#define TWO_PI (float)6.283185307
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#define PI2 (float)0.159154943
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/* type definition encoder instance */
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typedef struct iLBC_ULP_Inst_t_ {
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int lsf_bits[6][ULP_CLASSES+2];
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int start_bits[ULP_CLASSES+2];
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int startfirst_bits[ULP_CLASSES+2];
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int scale_bits[ULP_CLASSES+2];
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int state_bits[ULP_CLASSES+2];
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int extra_cb_index[CB_NSTAGES][ULP_CLASSES+2];
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int extra_cb_gain[CB_NSTAGES][ULP_CLASSES+2];
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int cb_index[NSUB_MAX][CB_NSTAGES][ULP_CLASSES+2];
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int cb_gain[NSUB_MAX][CB_NSTAGES][ULP_CLASSES+2];
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} iLBC_ULP_Inst_t;
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/* type definition encoder instance */
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typedef struct iLBC_Enc_Inst_t_ {
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/* flag for frame size mode */
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int mode;
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/* basic parameters for different frame sizes */
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int blockl;
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int nsub;
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int nasub;
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int no_of_bytes, no_of_words;
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int lpc_n;
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int state_short_len;
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const iLBC_ULP_Inst_t *ULP_inst;
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/* analysis filter state */
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float anaMem[LPC_FILTERORDER];
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/* old lsf parameters for interpolation */
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float lsfold[LPC_FILTERORDER];
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float lsfdeqold[LPC_FILTERORDER];
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/* signal buffer for LP analysis */
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float lpc_buffer[LPC_LOOKBACK + BLOCKL_MAX];
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/* state of input HP filter */
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float hpimem[4];
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} iLBC_Enc_Inst_t;
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/* type definition decoder instance */
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typedef struct iLBC_Dec_Inst_t_ {
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/* flag for frame size mode */
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int mode;
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/* basic parameters for different frame sizes */
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int blockl;
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int nsub;
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int nasub;
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int no_of_bytes, no_of_words;
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int lpc_n;
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int state_short_len;
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const iLBC_ULP_Inst_t *ULP_inst;
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/* synthesis filter state */
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float syntMem[LPC_FILTERORDER];
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/* old LSF for interpolation */
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float lsfdeqold[LPC_FILTERORDER];
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/* pitch lag estimated in enhancer and used in PLC */
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int last_lag;
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/* PLC state information */
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int prevLag, consPLICount, prevPLI, prev_enh_pl;
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float prevLpc[LPC_FILTERORDER+1];
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float prevResidual[NSUB_MAX*SUBL];
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float per;
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unsigned long seed;
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/* previous synthesis filter parameters */
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float old_syntdenum[(LPC_FILTERORDER + 1)*NSUB_MAX];
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/* state of output HP filter */
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float hpomem[4];
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/* enhancer state information */
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int use_enhancer;
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float enh_buf[ENH_BUFL];
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float enh_period[ENH_NBLOCKS_TOT];
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} iLBC_Dec_Inst_t;
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#endif
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