515 lines
16 KiB
C
515 lines
16 KiB
C
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/******************************************************************
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iLBC Speech Coder ANSI-C Source Code
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iLBC_encode.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 <string.h>
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#include "iLBC_define.h"
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#include "iLBC_encode.h"
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#include "LPCencode.h"
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#include "FrameClassify.h"
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#include "StateSearchW.h"
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#include "StateConstructW.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 "iCBSearch.h"
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#include "iCBConstruct.h"
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#include "hpInput.h"
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#include "anaFilter.h"
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#include "syntFilter.h"
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/*----------------------------------------------------------------*
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* Initiation of encoder instance.
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*---------------------------------------------------------------*/
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short initEncode( /* (o) Number of bytes
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encoded */
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iLBC_Enc_Inst_t *iLBCenc_inst, /* (i/o) Encoder instance */
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int mode /* (i) frame size mode */
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){
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iLBCenc_inst->mode = mode;
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if (mode==30) {
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iLBCenc_inst->blockl = BLOCKL_30MS;
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iLBCenc_inst->nsub = NSUB_30MS;
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iLBCenc_inst->nasub = NASUB_30MS;
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iLBCenc_inst->lpc_n = LPC_N_30MS;
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iLBCenc_inst->no_of_bytes = NO_OF_BYTES_30MS;
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iLBCenc_inst->no_of_words = NO_OF_WORDS_30MS;
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iLBCenc_inst->state_short_len=STATE_SHORT_LEN_30MS;
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/* ULP init */
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iLBCenc_inst->ULP_inst=&ULP_30msTbl;
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}
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else if (mode==20) {
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iLBCenc_inst->blockl = BLOCKL_20MS;
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iLBCenc_inst->nsub = NSUB_20MS;
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iLBCenc_inst->nasub = NASUB_20MS;
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iLBCenc_inst->lpc_n = LPC_N_20MS;
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iLBCenc_inst->no_of_bytes = NO_OF_BYTES_20MS;
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iLBCenc_inst->no_of_words = NO_OF_WORDS_20MS;
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iLBCenc_inst->state_short_len=STATE_SHORT_LEN_20MS;
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/* ULP init */
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iLBCenc_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((*iLBCenc_inst).anaMem, 0,
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LPC_FILTERORDER*sizeof(float));
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memcpy((*iLBCenc_inst).lsfold, lsfmeanTbl,
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LPC_FILTERORDER*sizeof(float));
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memcpy((*iLBCenc_inst).lsfdeqold, lsfmeanTbl,
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LPC_FILTERORDER*sizeof(float));
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memset((*iLBCenc_inst).lpc_buffer, 0,
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(LPC_LOOKBACK+BLOCKL_MAX)*sizeof(float));
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memset((*iLBCenc_inst).hpimem, 0, 4*sizeof(float));
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return (iLBCenc_inst->no_of_bytes);
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}
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/*----------------------------------------------------------------*
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* main encoder function
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*---------------------------------------------------------------*/
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void iLBC_encode(
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unsigned char *bytes, /* (o) encoded data bits iLBC */
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float *block, /* (o) speech vector to
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encode */
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iLBC_Enc_Inst_t *iLBCenc_inst /* (i/o) the general encoder
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state */
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){
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float data[BLOCKL_MAX];
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float residual[BLOCKL_MAX], reverseResidual[BLOCKL_MAX];
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int start, idxForMax, idxVec[STATE_LEN];
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float reverseDecresidual[BLOCKL_MAX], mem[CB_MEML];
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int n, k, meml_gotten, Nfor, Nback, i, pos;
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int gain_index[CB_NSTAGES*NASUB_MAX],
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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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unsigned char *pbytes;
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int diff, start_pos, state_first;
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float en1, en2;
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int index, ulp, firstpart;
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int subcount, subframe;
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float weightState[LPC_FILTERORDER];
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float syntdenum[NSUB_MAX*(LPC_FILTERORDER+1)];
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float weightdenum[NSUB_MAX*(LPC_FILTERORDER+1)];
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float decresidual[BLOCKL_MAX];
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/* high pass filtering of input signal if such is not done
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prior to calling this function */
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hpInput(block, iLBCenc_inst->blockl,
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data, (*iLBCenc_inst).hpimem);
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/* otherwise simply copy */
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/*memcpy(data,block,iLBCenc_inst->blockl*sizeof(float));*/
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/* LPC of hp filtered input data */
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LPCencode(syntdenum, weightdenum, lsf_i, data, iLBCenc_inst);
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/* inverse filter to get residual */
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for (n=0; n<iLBCenc_inst->nsub; n++) {
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anaFilter(&data[n*SUBL], &syntdenum[n*(LPC_FILTERORDER+1)],
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SUBL, &residual[n*SUBL], iLBCenc_inst->anaMem);
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}
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/* find state location */
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start = FrameClassify(iLBCenc_inst, residual);
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/* check if state should be in first or last part of the
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two subframes */
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diff = STATE_LEN - iLBCenc_inst->state_short_len;
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en1 = 0;
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index = (start-1)*SUBL;
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for (i = 0; i < iLBCenc_inst->state_short_len; i++) {
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en1 += residual[index+i]*residual[index+i];
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}
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en2 = 0;
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index = (start-1)*SUBL+diff;
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for (i = 0; i < iLBCenc_inst->state_short_len; i++) {
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en2 += residual[index+i]*residual[index+i];
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}
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if (en1 > en2) {
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state_first = 1;
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start_pos = (start-1)*SUBL;
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} else {
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state_first = 0;
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start_pos = (start-1)*SUBL + diff;
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}
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/* scalar quantization of state */
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StateSearchW(iLBCenc_inst, &residual[start_pos],
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&syntdenum[(start-1)*(LPC_FILTERORDER+1)],
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&weightdenum[(start-1)*(LPC_FILTERORDER+1)], &idxForMax,
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idxVec, iLBCenc_inst->state_short_len, state_first);
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StateConstructW(idxForMax, idxVec,
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&syntdenum[(start-1)*(LPC_FILTERORDER+1)],
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&decresidual[start_pos], iLBCenc_inst->state_short_len);
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/* predictive quantization in state */
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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-iLBCenc_inst->state_short_len)*sizeof(float));
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memcpy(mem+CB_MEML-iLBCenc_inst->state_short_len,
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decresidual+start_pos,
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iLBCenc_inst->state_short_len*sizeof(float));
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memset(weightState, 0, LPC_FILTERORDER*sizeof(float));
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/* encode sub-frames */
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iCBSearch(iLBCenc_inst, extra_cb_index, extra_gain_index,
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&residual[start_pos+iLBCenc_inst->state_short_len],
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mem+CB_MEML-stMemLTbl,
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stMemLTbl, diff, CB_NSTAGES,
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&weightdenum[start*(LPC_FILTERORDER+1)],
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weightState, 0);
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/* construct decoded vector */
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iCBConstruct(
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&decresidual[start_pos+iLBCenc_inst->state_short_len],
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extra_cb_index, extra_gain_index,
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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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reverseResidual[k] = residual[(start+1)*SUBL-1
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-(k+iLBCenc_inst->state_short_len)];
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}
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/* setup memory */
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meml_gotten = iLBCenc_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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memset(weightState, 0, LPC_FILTERORDER*sizeof(float));
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/* encode sub-frames */
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iCBSearch(iLBCenc_inst, extra_cb_index, extra_gain_index,
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reverseResidual, mem+CB_MEML-stMemLTbl, stMemLTbl,
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diff, CB_NSTAGES,
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&weightdenum[(start-1)*(LPC_FILTERORDER+1)],
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weightState, 0);
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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 = iLBCenc_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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memset(weightState, 0, LPC_FILTERORDER*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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/* encode sub-frame */
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iCBSearch(iLBCenc_inst, cb_index+subcount*CB_NSTAGES,
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gain_index+subcount*CB_NSTAGES,
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&residual[(start+1+subframe)*SUBL],
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mem+CB_MEML-memLfTbl[subcount],
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memLfTbl[subcount], SUBL, CB_NSTAGES,
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&weightdenum[(start+1+subframe)*
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(LPC_FILTERORDER+1)],
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weightState, subcount+1);
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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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memcpy(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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memset(weightState, 0, LPC_FILTERORDER*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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/* create reverse order vectors */
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for (n=0; n<Nback; n++) {
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for (k=0; k<SUBL; k++) {
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reverseResidual[n*SUBL+k] =
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residual[(start-1)*SUBL-1-n*SUBL-k];
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reverseDecresidual[n*SUBL+k] =
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decresidual[(start-1)*SUBL-1-n*SUBL-k];
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}
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}
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/* setup memory */
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meml_gotten = SUBL*(iLBCenc_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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memset(weightState, 0, LPC_FILTERORDER*sizeof(float));
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/* loop over sub-frames to encode */
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for (subframe=0; subframe<Nback; subframe++) {
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/* encode sub-frame */
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iCBSearch(iLBCenc_inst, cb_index+subcount*CB_NSTAGES,
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gain_index+subcount*CB_NSTAGES,
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&reverseResidual[subframe*SUBL],
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mem+CB_MEML-memLfTbl[subcount],
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memLfTbl[subcount], SUBL, CB_NSTAGES,
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&weightdenum[(start-2-subframe)*
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(LPC_FILTERORDER+1)],
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weightState, subcount+1);
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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],
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memLfTbl[subcount], SUBL, CB_NSTAGES);
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/* update memory */
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memcpy(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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memset(weightState, 0, LPC_FILTERORDER*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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/* end encoding part */
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/* adjust index */
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index_conv_enc(cb_index);
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/* pack bytes */
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pbytes=bytes;
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pos=0;
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/* loop over the 3 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*iLBCenc_inst->lpc_n; k++) {
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packsplit(&lsf_i[k], &firstpart, &lsf_i[k],
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iLBCenc_inst->ULP_inst->lsf_bits[k][ulp],
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iLBCenc_inst->ULP_inst->lsf_bits[k][ulp]+
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iLBCenc_inst->ULP_inst->lsf_bits[k][ulp+1]+
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iLBCenc_inst->ULP_inst->lsf_bits[k][ulp+2]);
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dopack( &pbytes, firstpart,
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iLBCenc_inst->ULP_inst->lsf_bits[k][ulp], &pos);
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}
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/* Start block info */
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packsplit(&start, &firstpart, &start,
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iLBCenc_inst->ULP_inst->start_bits[ulp],
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iLBCenc_inst->ULP_inst->start_bits[ulp]+
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iLBCenc_inst->ULP_inst->start_bits[ulp+1]+
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iLBCenc_inst->ULP_inst->start_bits[ulp+2]);
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dopack( &pbytes, firstpart,
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iLBCenc_inst->ULP_inst->start_bits[ulp], &pos);
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packsplit(&state_first, &firstpart, &state_first,
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iLBCenc_inst->ULP_inst->startfirst_bits[ulp],
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iLBCenc_inst->ULP_inst->startfirst_bits[ulp]+
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iLBCenc_inst->ULP_inst->startfirst_bits[ulp+1]+
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iLBCenc_inst->ULP_inst->startfirst_bits[ulp+2]);
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dopack( &pbytes, firstpart,
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iLBCenc_inst->ULP_inst->startfirst_bits[ulp], &pos);
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packsplit(&idxForMax, &firstpart, &idxForMax,
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iLBCenc_inst->ULP_inst->scale_bits[ulp],
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iLBCenc_inst->ULP_inst->scale_bits[ulp]+
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iLBCenc_inst->ULP_inst->scale_bits[ulp+1]+
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iLBCenc_inst->ULP_inst->scale_bits[ulp+2]);
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dopack( &pbytes, firstpart,
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iLBCenc_inst->ULP_inst->scale_bits[ulp], &pos);
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for (k=0; k<iLBCenc_inst->state_short_len; k++) {
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packsplit(idxVec+k, &firstpart, idxVec+k,
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iLBCenc_inst->ULP_inst->state_bits[ulp],
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iLBCenc_inst->ULP_inst->state_bits[ulp]+
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iLBCenc_inst->ULP_inst->state_bits[ulp+1]+
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iLBCenc_inst->ULP_inst->state_bits[ulp+2]);
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dopack( &pbytes, firstpart,
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iLBCenc_inst->ULP_inst->state_bits[ulp], &pos);
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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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packsplit(extra_cb_index+k, &firstpart,
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extra_cb_index+k,
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iLBCenc_inst->ULP_inst->extra_cb_index[k][ulp],
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iLBCenc_inst->ULP_inst->extra_cb_index[k][ulp]+
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iLBCenc_inst->ULP_inst->extra_cb_index[k][ulp+1]+
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iLBCenc_inst->ULP_inst->extra_cb_index[k][ulp+2]);
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dopack( &pbytes, firstpart,
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iLBCenc_inst->ULP_inst->extra_cb_index[k][ulp],
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&pos);
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}
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for (k=0;k<CB_NSTAGES;k++) {
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packsplit(extra_gain_index+k, &firstpart,
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extra_gain_index+k,
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iLBCenc_inst->ULP_inst->extra_cb_gain[k][ulp],
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iLBCenc_inst->ULP_inst->extra_cb_gain[k][ulp]+
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iLBCenc_inst->ULP_inst->extra_cb_gain[k][ulp+1]+
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iLBCenc_inst->ULP_inst->extra_cb_gain[k][ulp+2]);
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dopack( &pbytes, firstpart,
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iLBCenc_inst->ULP_inst->extra_cb_gain[k][ulp],
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&pos);
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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<iLBCenc_inst->nasub; i++) {
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for (k=0; k<CB_NSTAGES; k++) {
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packsplit(cb_index+i*CB_NSTAGES+k, &firstpart,
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cb_index+i*CB_NSTAGES+k,
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iLBCenc_inst->ULP_inst->cb_index[i][k][ulp],
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iLBCenc_inst->ULP_inst->cb_index[i][k][ulp]+
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iLBCenc_inst->ULP_inst->cb_index[i][k][ulp+1]+
|
|
iLBCenc_inst->ULP_inst->cb_index[i][k][ulp+2]);
|
|
dopack( &pbytes, firstpart,
|
|
iLBCenc_inst->ULP_inst->cb_index[i][k][ulp],
|
|
&pos);
|
|
}
|
|
}
|
|
|
|
for (i=0; i<iLBCenc_inst->nasub; i++) {
|
|
for (k=0; k<CB_NSTAGES; k++) {
|
|
|
|
|
|
packsplit(gain_index+i*CB_NSTAGES+k, &firstpart,
|
|
gain_index+i*CB_NSTAGES+k,
|
|
iLBCenc_inst->ULP_inst->cb_gain[i][k][ulp],
|
|
iLBCenc_inst->ULP_inst->cb_gain[i][k][ulp]+
|
|
iLBCenc_inst->ULP_inst->cb_gain[i][k][ulp+1]+
|
|
iLBCenc_inst->ULP_inst->cb_gain[i][k][ulp+2]);
|
|
dopack( &pbytes, firstpart,
|
|
iLBCenc_inst->ULP_inst->cb_gain[i][k][ulp],
|
|
&pos);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* set the last bit to zero (otherwise the decoder
|
|
will treat it as a lost frame) */
|
|
dopack( &pbytes, 0, 1, &pos);
|
|
}
|
|
|
|
|
|
|