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2c65582b66
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@7221 65c4cc65-6c06-0410-ace0-fbb531ad65f3
620 lines
19 KiB
C
620 lines
19 KiB
C
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/******************************************************************
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iLBC Speech Coder ANSI-C Source Code
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iLBC_decode.c
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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 <math.h>
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#include <stdlib.h>
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#include "iLBC_define.h"
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#include "iLBC_decode.h"
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#include "StateConstructW.h"
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#include "LPCdecode.h"
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#include "iCBConstruct.h"
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#include "doCPLC.h"
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#include "helpfun.h"
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#include "constants.h"
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#include "packing.h"
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#include "string.h"
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#include "enhancer.h"
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#include "hpOutput.h"
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#include "syntFilter.h"
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/*----------------------------------------------------------------*
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* Initiation of decoder instance.
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*---------------------------------------------------------------*/
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short initDecode( /* (o) Number of decoded
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samples */
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iLBC_Dec_Inst_t *iLBCdec_inst, /* (i/o) Decoder instance */
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int mode, /* (i) frame size mode */
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int use_enhancer /* (i) 1 to use enhancer
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0 to run without
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enhancer */
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){
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int i;
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iLBCdec_inst->mode = mode;
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if (mode==30) {
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iLBCdec_inst->blockl = BLOCKL_30MS;
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iLBCdec_inst->nsub = NSUB_30MS;
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iLBCdec_inst->nasub = NASUB_30MS;
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iLBCdec_inst->lpc_n = LPC_N_30MS;
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iLBCdec_inst->no_of_bytes = NO_OF_BYTES_30MS;
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iLBCdec_inst->no_of_words = NO_OF_WORDS_30MS;
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iLBCdec_inst->state_short_len=STATE_SHORT_LEN_30MS;
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/* ULP init */
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iLBCdec_inst->ULP_inst=&ULP_30msTbl;
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}
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else if (mode==20) {
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iLBCdec_inst->blockl = BLOCKL_20MS;
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iLBCdec_inst->nsub = NSUB_20MS;
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iLBCdec_inst->nasub = NASUB_20MS;
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iLBCdec_inst->lpc_n = LPC_N_20MS;
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iLBCdec_inst->no_of_bytes = NO_OF_BYTES_20MS;
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iLBCdec_inst->no_of_words = NO_OF_WORDS_20MS;
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iLBCdec_inst->state_short_len=STATE_SHORT_LEN_20MS;
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/* ULP init */
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iLBCdec_inst->ULP_inst=&ULP_20msTbl;
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}
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else {
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exit(2);
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}
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memset(iLBCdec_inst->syntMem, 0,
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LPC_FILTERORDER*sizeof(float));
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memcpy((*iLBCdec_inst).lsfdeqold, lsfmeanTbl,
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LPC_FILTERORDER*sizeof(float));
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memset(iLBCdec_inst->old_syntdenum, 0,
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((LPC_FILTERORDER + 1)*NSUB_MAX)*sizeof(float));
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for (i=0; i<NSUB_MAX; i++)
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iLBCdec_inst->old_syntdenum[i*(LPC_FILTERORDER+1)]=1.0;
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iLBCdec_inst->last_lag = 20;
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iLBCdec_inst->prevLag = 120;
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iLBCdec_inst->per = 0.0;
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iLBCdec_inst->consPLICount = 0;
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iLBCdec_inst->prevPLI = 0;
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iLBCdec_inst->prevLpc[0] = 1.0;
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memset(iLBCdec_inst->prevLpc+1,0,
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LPC_FILTERORDER*sizeof(float));
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memset(iLBCdec_inst->prevResidual, 0, BLOCKL_MAX*sizeof(float));
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iLBCdec_inst->seed=777;
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memset(iLBCdec_inst->hpomem, 0, 4*sizeof(float));
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iLBCdec_inst->use_enhancer = use_enhancer;
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memset(iLBCdec_inst->enh_buf, 0, ENH_BUFL*sizeof(float));
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for (i=0;i<ENH_NBLOCKS_TOT;i++)
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iLBCdec_inst->enh_period[i]=(float)40.0;
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iLBCdec_inst->prev_enh_pl = 0;
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return (iLBCdec_inst->blockl);
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}
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/*----------------------------------------------------------------*
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* frame residual decoder function (subrutine to iLBC_decode)
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*---------------------------------------------------------------*/
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static void Decode(
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iLBC_Dec_Inst_t *iLBCdec_inst, /* (i/o) the decoder state
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structure */
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float *decresidual, /* (o) decoded residual frame */
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int start, /* (i) location of start
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state */
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int idxForMax, /* (i) codebook index for the
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maximum value */
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int *idxVec, /* (i) codebook indexes for the
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samples in the start
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state */
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float *syntdenum, /* (i) the decoded synthesis
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filter coefficients */
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int *cb_index, /* (i) the indexes for the
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adaptive codebook */
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int *gain_index, /* (i) the indexes for the
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corresponding gains */
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int *extra_cb_index, /* (i) the indexes for the
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adaptive codebook part
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of start state */
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int *extra_gain_index, /* (i) the indexes for the
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corresponding gains */
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int state_first /* (i) 1 if non adaptive part
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of start state comes
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first 0 if that part
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comes last */
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){
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float reverseDecresidual[BLOCKL_MAX], mem[CB_MEML];
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int k, meml_gotten, Nfor, Nback, i;
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int diff, start_pos;
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int subcount, subframe;
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diff = STATE_LEN - iLBCdec_inst->state_short_len;
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if (state_first == 1) {
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start_pos = (start-1)*SUBL;
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} else {
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start_pos = (start-1)*SUBL + diff;
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}
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/* decode scalar part of start state */
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StateConstructW(idxForMax, idxVec,
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&syntdenum[(start-1)*(LPC_FILTERORDER+1)],
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&decresidual[start_pos], iLBCdec_inst->state_short_len);
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if (state_first) { /* put adaptive part in the end */
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/* setup memory */
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memset(mem, 0,
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(CB_MEML-iLBCdec_inst->state_short_len)*sizeof(float));
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memcpy(mem+CB_MEML-iLBCdec_inst->state_short_len,
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decresidual+start_pos,
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iLBCdec_inst->state_short_len*sizeof(float));
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/* construct decoded vector */
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iCBConstruct(
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&decresidual[start_pos+iLBCdec_inst->state_short_len],
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extra_cb_index, extra_gain_index, mem+CB_MEML-stMemLTbl,
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stMemLTbl, diff, CB_NSTAGES);
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}
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else {/* put adaptive part in the beginning */
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/* create reversed vectors for prediction */
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for (k=0; k<diff; k++) {
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reverseDecresidual[k] =
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decresidual[(start+1)*SUBL-1-
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(k+iLBCdec_inst->state_short_len)];
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}
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/* setup memory */
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meml_gotten = iLBCdec_inst->state_short_len;
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for (k=0; k<meml_gotten; k++){
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mem[CB_MEML-1-k] = decresidual[start_pos + k];
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}
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memset(mem, 0, (CB_MEML-k)*sizeof(float));
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/* construct decoded vector */
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iCBConstruct(reverseDecresidual, extra_cb_index,
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extra_gain_index, mem+CB_MEML-stMemLTbl, stMemLTbl,
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diff, CB_NSTAGES);
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/* get decoded residual from reversed vector */
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for (k=0; k<diff; k++) {
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decresidual[start_pos-1-k] = reverseDecresidual[k];
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}
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}
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/* counter for predicted sub-frames */
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subcount=0;
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/* forward prediction of sub-frames */
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Nfor = iLBCdec_inst->nsub-start-1;
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if ( Nfor > 0 ){
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/* setup memory */
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memset(mem, 0, (CB_MEML-STATE_LEN)*sizeof(float));
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memcpy(mem+CB_MEML-STATE_LEN, decresidual+(start-1)*SUBL,
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STATE_LEN*sizeof(float));
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/* loop over sub-frames to encode */
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for (subframe=0; subframe<Nfor; subframe++) {
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/* construct decoded vector */
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iCBConstruct(&decresidual[(start+1+subframe)*SUBL],
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cb_index+subcount*CB_NSTAGES,
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gain_index+subcount*CB_NSTAGES,
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mem+CB_MEML-memLfTbl[subcount],
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memLfTbl[subcount], SUBL, CB_NSTAGES);
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/* update memory */
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memmove(mem, mem+SUBL, (CB_MEML-SUBL)*sizeof(float));
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memcpy(mem+CB_MEML-SUBL,
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&decresidual[(start+1+subframe)*SUBL],
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SUBL*sizeof(float));
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subcount++;
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}
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}
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/* backward prediction of sub-frames */
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Nback = start-1;
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if ( Nback > 0 ) {
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/* setup memory */
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meml_gotten = SUBL*(iLBCdec_inst->nsub+1-start);
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if ( meml_gotten > CB_MEML ) {
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meml_gotten=CB_MEML;
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}
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for (k=0; k<meml_gotten; k++) {
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mem[CB_MEML-1-k] = decresidual[(start-1)*SUBL + k];
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}
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memset(mem, 0, (CB_MEML-k)*sizeof(float));
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/* loop over subframes to decode */
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for (subframe=0; subframe<Nback; subframe++) {
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/* construct decoded vector */
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iCBConstruct(&reverseDecresidual[subframe*SUBL],
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cb_index+subcount*CB_NSTAGES,
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gain_index+subcount*CB_NSTAGES,
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mem+CB_MEML-memLfTbl[subcount], memLfTbl[subcount],
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SUBL, CB_NSTAGES);
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/* update memory */
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memmove(mem, mem+SUBL, (CB_MEML-SUBL)*sizeof(float));
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memcpy(mem+CB_MEML-SUBL,
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&reverseDecresidual[subframe*SUBL],
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SUBL*sizeof(float));
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subcount++;
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}
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/* get decoded residual from reversed vector */
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for (i=0; i<SUBL*Nback; i++)
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decresidual[SUBL*Nback - i - 1] =
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reverseDecresidual[i];
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}
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}
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/*----------------------------------------------------------------*
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* main decoder function
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*---------------------------------------------------------------*/
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void iLBC_decode(
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float *decblock, /* (o) decoded signal block */
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unsigned char *bytes, /* (i) encoded signal bits */
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iLBC_Dec_Inst_t *iLBCdec_inst, /* (i/o) the decoder state
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structure */
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int mode /* (i) 0: bad packet, PLC,
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1: normal */
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){
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float data[BLOCKL_MAX];
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float lsfdeq[LPC_FILTERORDER*LPC_N_MAX];
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float PLCresidual[BLOCKL_MAX], PLClpc[LPC_FILTERORDER + 1];
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float zeros[BLOCKL_MAX], one[LPC_FILTERORDER + 1];
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int k, i, start, idxForMax, pos, lastpart, ulp;
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int lag, ilag;
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float cc, maxcc;
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int idxVec[STATE_LEN];
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int check;
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int gain_index[NASUB_MAX*CB_NSTAGES],
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extra_gain_index[CB_NSTAGES];
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int cb_index[CB_NSTAGES*NASUB_MAX], extra_cb_index[CB_NSTAGES];
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int lsf_i[LSF_NSPLIT*LPC_N_MAX];
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int state_first;
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int last_bit;
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unsigned char *pbytes;
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float weightdenum[(LPC_FILTERORDER + 1)*NSUB_MAX];
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int order_plus_one;
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float syntdenum[NSUB_MAX*(LPC_FILTERORDER+1)];
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float decresidual[BLOCKL_MAX];
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if (mode>0) { /* the data are good */
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/* decode data */
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pbytes=bytes;
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pos=0;
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/* Set everything to zero before decoding */
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for (k=0; k<LSF_NSPLIT*LPC_N_MAX; k++) {
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lsf_i[k]=0;
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}
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start=0;
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state_first=0;
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idxForMax=0;
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for (k=0; k<iLBCdec_inst->state_short_len; k++) {
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idxVec[k]=0;
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}
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for (k=0; k<CB_NSTAGES; k++) {
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extra_cb_index[k]=0;
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}
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for (k=0; k<CB_NSTAGES; k++) {
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extra_gain_index[k]=0;
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}
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for (i=0; i<iLBCdec_inst->nasub; i++) {
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for (k=0; k<CB_NSTAGES; k++) {
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cb_index[i*CB_NSTAGES+k]=0;
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}
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}
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for (i=0; i<iLBCdec_inst->nasub; i++) {
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for (k=0; k<CB_NSTAGES; k++) {
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gain_index[i*CB_NSTAGES+k]=0;
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}
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}
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/* loop over ULP classes */
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for (ulp=0; ulp<3; ulp++) {
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/* LSF */
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for (k=0; k<LSF_NSPLIT*iLBCdec_inst->lpc_n; k++){
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unpack( &pbytes, &lastpart,
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iLBCdec_inst->ULP_inst->lsf_bits[k][ulp], &pos);
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packcombine(&lsf_i[k], lastpart,
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iLBCdec_inst->ULP_inst->lsf_bits[k][ulp]);
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}
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/* Start block info */
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unpack( &pbytes, &lastpart,
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iLBCdec_inst->ULP_inst->start_bits[ulp], &pos);
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packcombine(&start, lastpart,
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iLBCdec_inst->ULP_inst->start_bits[ulp]);
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unpack( &pbytes, &lastpart,
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iLBCdec_inst->ULP_inst->startfirst_bits[ulp], &pos);
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packcombine(&state_first, lastpart,
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iLBCdec_inst->ULP_inst->startfirst_bits[ulp]);
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unpack( &pbytes, &lastpart,
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iLBCdec_inst->ULP_inst->scale_bits[ulp], &pos);
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packcombine(&idxForMax, lastpart,
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iLBCdec_inst->ULP_inst->scale_bits[ulp]);
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for (k=0; k<iLBCdec_inst->state_short_len; k++) {
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unpack( &pbytes, &lastpart,
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iLBCdec_inst->ULP_inst->state_bits[ulp], &pos);
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packcombine(idxVec+k, lastpart,
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iLBCdec_inst->ULP_inst->state_bits[ulp]);
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}
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/* 23/22 (20ms/30ms) sample block */
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for (k=0; k<CB_NSTAGES; k++) {
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unpack( &pbytes, &lastpart,
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iLBCdec_inst->ULP_inst->extra_cb_index[k][ulp],
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&pos);
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packcombine(extra_cb_index+k, lastpart,
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iLBCdec_inst->ULP_inst->extra_cb_index[k][ulp]);
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}
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for (k=0; k<CB_NSTAGES; k++) {
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unpack( &pbytes, &lastpart,
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iLBCdec_inst->ULP_inst->extra_cb_gain[k][ulp],
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&pos);
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packcombine(extra_gain_index+k, lastpart,
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iLBCdec_inst->ULP_inst->extra_cb_gain[k][ulp]);
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}
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/* The two/four (20ms/30ms) 40 sample sub-blocks */
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for (i=0; i<iLBCdec_inst->nasub; i++) {
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for (k=0; k<CB_NSTAGES; k++) {
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unpack( &pbytes, &lastpart,
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iLBCdec_inst->ULP_inst->cb_index[i][k][ulp],
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&pos);
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packcombine(cb_index+i*CB_NSTAGES+k, lastpart,
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iLBCdec_inst->ULP_inst->cb_index[i][k][ulp]);
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}
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}
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for (i=0; i<iLBCdec_inst->nasub; i++) {
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for (k=0; k<CB_NSTAGES; k++) {
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unpack( &pbytes, &lastpart,
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iLBCdec_inst->ULP_inst->cb_gain[i][k][ulp],
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&pos);
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packcombine(gain_index+i*CB_NSTAGES+k, lastpart,
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iLBCdec_inst->ULP_inst->cb_gain[i][k][ulp]);
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}
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}
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}
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/* Extract last bit. If it is 1 this indicates an
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empty/lost frame */
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unpack( &pbytes, &last_bit, 1, &pos);
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/* Check for bit errors or empty/lost frames */
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if (start<1)
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mode = 0;
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if (iLBCdec_inst->mode==20 && start>3)
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mode = 0;
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if (iLBCdec_inst->mode==30 && start>5)
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mode = 0;
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if (last_bit==1)
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mode = 0;
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if (mode==1) { /* No bit errors was detected,
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continue decoding */
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/* adjust index */
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index_conv_dec(cb_index);
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/* decode the lsf */
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SimplelsfDEQ(lsfdeq, lsf_i, iLBCdec_inst->lpc_n);
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check=LSF_check(lsfdeq, LPC_FILTERORDER,
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iLBCdec_inst->lpc_n);
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DecoderInterpolateLSF(syntdenum, weightdenum,
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lsfdeq, LPC_FILTERORDER, iLBCdec_inst);
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Decode(iLBCdec_inst, decresidual, start, idxForMax,
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idxVec, syntdenum, cb_index, gain_index,
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extra_cb_index, extra_gain_index,
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state_first);
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/* preparing the plc for a future loss! */
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doThePLC(PLCresidual, PLClpc, 0, decresidual,
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syntdenum +
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(LPC_FILTERORDER + 1)*(iLBCdec_inst->nsub - 1),
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(*iLBCdec_inst).last_lag, iLBCdec_inst);
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memcpy(decresidual, PLCresidual,
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|
iLBCdec_inst->blockl*sizeof(float));
|
|
}
|
|
|
|
|
|
|
|
}
|
|
|
|
if (mode == 0) {
|
|
/* the data is bad (either a PLC call
|
|
* was made or a severe bit error was detected)
|
|
*/
|
|
|
|
/* packet loss conceal */
|
|
|
|
memset(zeros, 0, BLOCKL_MAX*sizeof(float));
|
|
|
|
one[0] = 1;
|
|
memset(one+1, 0, LPC_FILTERORDER*sizeof(float));
|
|
|
|
start=0;
|
|
|
|
doThePLC(PLCresidual, PLClpc, 1, zeros, one,
|
|
(*iLBCdec_inst).last_lag, iLBCdec_inst);
|
|
memcpy(decresidual, PLCresidual,
|
|
iLBCdec_inst->blockl*sizeof(float));
|
|
|
|
order_plus_one = LPC_FILTERORDER + 1;
|
|
for (i = 0; i < iLBCdec_inst->nsub; i++) {
|
|
memcpy(syntdenum+(i*order_plus_one), PLClpc,
|
|
order_plus_one*sizeof(float));
|
|
}
|
|
}
|
|
|
|
if (iLBCdec_inst->use_enhancer == 1) {
|
|
|
|
/* post filtering */
|
|
|
|
iLBCdec_inst->last_lag =
|
|
enhancerInterface(data, decresidual, iLBCdec_inst);
|
|
|
|
/* synthesis filtering */
|
|
|
|
if (iLBCdec_inst->mode==20) {
|
|
/* Enhancer has 40 samples delay */
|
|
i=0;
|
|
syntFilter(data + i*SUBL,
|
|
iLBCdec_inst->old_syntdenum +
|
|
(i+iLBCdec_inst->nsub-1)*(LPC_FILTERORDER+1),
|
|
SUBL, iLBCdec_inst->syntMem);
|
|
for (i=1; i < iLBCdec_inst->nsub; i++) {
|
|
syntFilter(data + i*SUBL,
|
|
syntdenum + (i-1)*(LPC_FILTERORDER+1),
|
|
SUBL, iLBCdec_inst->syntMem);
|
|
}
|
|
} else if (iLBCdec_inst->mode==30) {
|
|
/* Enhancer has 80 samples delay */
|
|
for (i=0; i < 2; i++) {
|
|
syntFilter(data + i*SUBL,
|
|
|
|
|
|
iLBCdec_inst->old_syntdenum +
|
|
(i+iLBCdec_inst->nsub-2)*(LPC_FILTERORDER+1),
|
|
SUBL, iLBCdec_inst->syntMem);
|
|
}
|
|
for (i=2; i < iLBCdec_inst->nsub; i++) {
|
|
syntFilter(data + i*SUBL,
|
|
syntdenum + (i-2)*(LPC_FILTERORDER+1), SUBL,
|
|
iLBCdec_inst->syntMem);
|
|
}
|
|
}
|
|
|
|
} else {
|
|
|
|
/* Find last lag */
|
|
lag = 20;
|
|
maxcc = xCorrCoef(&decresidual[BLOCKL_MAX-ENH_BLOCKL],
|
|
&decresidual[BLOCKL_MAX-ENH_BLOCKL-lag], ENH_BLOCKL);
|
|
|
|
for (ilag=21; ilag<120; ilag++) {
|
|
cc = xCorrCoef(&decresidual[BLOCKL_MAX-ENH_BLOCKL],
|
|
&decresidual[BLOCKL_MAX-ENH_BLOCKL-ilag],
|
|
ENH_BLOCKL);
|
|
|
|
if (cc > maxcc) {
|
|
maxcc = cc;
|
|
lag = ilag;
|
|
}
|
|
}
|
|
iLBCdec_inst->last_lag = lag;
|
|
|
|
/* copy data and run synthesis filter */
|
|
|
|
memcpy(data, decresidual,
|
|
iLBCdec_inst->blockl*sizeof(float));
|
|
for (i=0; i < iLBCdec_inst->nsub; i++) {
|
|
syntFilter(data + i*SUBL,
|
|
syntdenum + i*(LPC_FILTERORDER+1), SUBL,
|
|
iLBCdec_inst->syntMem);
|
|
}
|
|
}
|
|
|
|
/* high pass filtering on output if desired, otherwise
|
|
copy to out */
|
|
|
|
hpOutput(data, iLBCdec_inst->blockl,
|
|
decblock,iLBCdec_inst->hpomem);
|
|
|
|
/* memcpy(decblock,data,iLBCdec_inst->blockl*sizeof(float));*/
|
|
|
|
memcpy(iLBCdec_inst->old_syntdenum, syntdenum,
|
|
|
|
iLBCdec_inst->nsub*(LPC_FILTERORDER+1)*sizeof(float));
|
|
|
|
iLBCdec_inst->prev_enh_pl=0;
|
|
|
|
|
|
|
|
if (mode==0) { /* PLC was used */
|
|
iLBCdec_inst->prev_enh_pl=1;
|
|
}
|
|
}
|
|
|
|
|