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/******************************************************************
iLBC Speech Coder ANSI-C Source Code
iLBC_encode.c
Copyright (C) The Internet Society (2004).
All Rights Reserved.
******************************************************************/
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include "iLBC_define.h"
#include "LPCencode.h"
#include "FrameClassify.h"
#include "StateSearchW.h"
#include "StateConstructW.h"
#include "helpfun.h"
#include "constants.h"
#include "packing.h"
#include "iCBSearch.h"
#include "iCBConstruct.h"
#include "hpInput.h"
#include "anaFilter.h"
#include "syntFilter.h"
/*----------------------------------------------------------------*
* Initiation of encoder instance.
*---------------------------------------------------------------*/
short initEncode( /* (o) Number of bytes
encoded */
iLBC_Enc_Inst_t *iLBCenc_inst, /* (i/o) Encoder instance */
int mode /* (i) frame size mode */
){
iLBCenc_inst->mode = mode;
if (mode==30) {
iLBCenc_inst->blockl = BLOCKL_30MS;
iLBCenc_inst->nsub = NSUB_30MS;
iLBCenc_inst->nasub = NASUB_30MS;
iLBCenc_inst->lpc_n = LPC_N_30MS;
iLBCenc_inst->no_of_bytes = NO_OF_BYTES_30MS;
iLBCenc_inst->no_of_words = NO_OF_WORDS_30MS;
iLBCenc_inst->state_short_len=STATE_SHORT_LEN_30MS;
/* ULP init */
iLBCenc_inst->ULP_inst=&ULP_30msTbl;
}
else if (mode==20) {
iLBCenc_inst->blockl = BLOCKL_20MS;
iLBCenc_inst->nsub = NSUB_20MS;
iLBCenc_inst->nasub = NASUB_20MS;
iLBCenc_inst->lpc_n = LPC_N_20MS;
iLBCenc_inst->no_of_bytes = NO_OF_BYTES_20MS;
iLBCenc_inst->no_of_words = NO_OF_WORDS_20MS;
iLBCenc_inst->state_short_len=STATE_SHORT_LEN_20MS;
/* ULP init */
iLBCenc_inst->ULP_inst=&ULP_20msTbl;
}
else {
exit(2);
}
memset((*iLBCenc_inst).anaMem, 0,
LPC_FILTERORDER*sizeof(float));
memcpy((*iLBCenc_inst).lsfold, lsfmeanTbl,
LPC_FILTERORDER*sizeof(float));
memcpy((*iLBCenc_inst).lsfdeqold, lsfmeanTbl,
LPC_FILTERORDER*sizeof(float));
memset((*iLBCenc_inst).lpc_buffer, 0,
(LPC_LOOKBACK+BLOCKL_MAX)*sizeof(float));
memset((*iLBCenc_inst).hpimem, 0, 4*sizeof(float));
return (iLBCenc_inst->no_of_bytes);
}
/*----------------------------------------------------------------*
* main encoder function
*---------------------------------------------------------------*/
void iLBC_encode(
unsigned char *bytes, /* (o) encoded data bits iLBC */
float *block, /* (o) speech vector to
encode */
iLBC_Enc_Inst_t *iLBCenc_inst /* (i/o) the general encoder
state */
){
float data[BLOCKL_MAX];
float residual[BLOCKL_MAX], reverseResidual[BLOCKL_MAX];
int start, idxForMax, idxVec[STATE_LEN];
float reverseDecresidual[BLOCKL_MAX], mem[CB_MEML];
int n, k, meml_gotten, Nfor, Nback, i, pos;
int gain_index[CB_NSTAGES*NASUB_MAX],
extra_gain_index[CB_NSTAGES];
int cb_index[CB_NSTAGES*NASUB_MAX],extra_cb_index[CB_NSTAGES];
int lsf_i[LSF_NSPLIT*LPC_N_MAX];
unsigned char *pbytes;
int diff, start_pos, state_first;
float en1, en2;
int index, ulp, firstpart;
int subcount, subframe;
float weightState[LPC_FILTERORDER];
float syntdenum[NSUB_MAX*(LPC_FILTERORDER+1)];
float weightdenum[NSUB_MAX*(LPC_FILTERORDER+1)];
float decresidual[BLOCKL_MAX];
/* high pass filtering of input signal if such is not done
prior to calling this function */
hpInput(block, iLBCenc_inst->blockl,
data, (*iLBCenc_inst).hpimem);
/* otherwise simply copy */
/*memcpy(data,block,iLBCenc_inst->blockl*sizeof(float));*/
/* LPC of hp filtered input data */
LPCencode(syntdenum, weightdenum, lsf_i, data, iLBCenc_inst);
/* inverse filter to get residual */
for (n=0; n<iLBCenc_inst->nsub; n++) {
anaFilter(&data[n*SUBL], &syntdenum[n*(LPC_FILTERORDER+1)],
SUBL, &residual[n*SUBL], iLBCenc_inst->anaMem);
}
/* find state location */
start = FrameClassify(iLBCenc_inst, residual);
/* check if state should be in first or last part of the
two subframes */
diff = STATE_LEN - iLBCenc_inst->state_short_len;
en1 = 0;
index = (start-1)*SUBL;
for (i = 0; i < iLBCenc_inst->state_short_len; i++) {
en1 += residual[index+i]*residual[index+i];
}
en2 = 0;
index = (start-1)*SUBL+diff;
for (i = 0; i < iLBCenc_inst->state_short_len; i++) {
en2 += residual[index+i]*residual[index+i];
}
if (en1 > en2) {
state_first = 1;
start_pos = (start-1)*SUBL;
} else {
state_first = 0;
start_pos = (start-1)*SUBL + diff;
}
/* scalar quantization of state */
StateSearchW(iLBCenc_inst, &residual[start_pos],
&syntdenum[(start-1)*(LPC_FILTERORDER+1)],
&weightdenum[(start-1)*(LPC_FILTERORDER+1)], &idxForMax,
idxVec, iLBCenc_inst->state_short_len, state_first);
StateConstructW(idxForMax, idxVec,
&syntdenum[(start-1)*(LPC_FILTERORDER+1)],
&decresidual[start_pos], iLBCenc_inst->state_short_len);
/* predictive quantization in state */
if (state_first) { /* put adaptive part in the end */
/* setup memory */
memset(mem, 0,
(CB_MEML-iLBCenc_inst->state_short_len)*sizeof(float));
memcpy(mem+CB_MEML-iLBCenc_inst->state_short_len,
decresidual+start_pos,
iLBCenc_inst->state_short_len*sizeof(float));
memset(weightState, 0, LPC_FILTERORDER*sizeof(float));
/* encode sub-frames */
iCBSearch(iLBCenc_inst, extra_cb_index, extra_gain_index,
&residual[start_pos+iLBCenc_inst->state_short_len],
mem+CB_MEML-stMemLTbl,
stMemLTbl, diff, CB_NSTAGES,
&weightdenum[start*(LPC_FILTERORDER+1)],
weightState, 0);
/* construct decoded vector */
iCBConstruct(
&decresidual[start_pos+iLBCenc_inst->state_short_len],
extra_cb_index, extra_gain_index,
mem+CB_MEML-stMemLTbl,
stMemLTbl, diff, CB_NSTAGES);
}
else { /* put adaptive part in the beginning */
/* create reversed vectors for prediction */
for (k=0; k<diff; k++) {
reverseResidual[k] = residual[(start+1)*SUBL-1
-(k+iLBCenc_inst->state_short_len)];
}
/* setup memory */
meml_gotten = iLBCenc_inst->state_short_len;
for (k=0; k<meml_gotten; k++) {
mem[CB_MEML-1-k] = decresidual[start_pos + k];
}
memset(mem, 0, (CB_MEML-k)*sizeof(float));
memset(weightState, 0, LPC_FILTERORDER*sizeof(float));
/* encode sub-frames */
iCBSearch(iLBCenc_inst, extra_cb_index, extra_gain_index,
reverseResidual, mem+CB_MEML-stMemLTbl, stMemLTbl,
diff, CB_NSTAGES,
&weightdenum[(start-1)*(LPC_FILTERORDER+1)],
weightState, 0);
/* construct decoded vector */
iCBConstruct(reverseDecresidual, extra_cb_index,
extra_gain_index, mem+CB_MEML-stMemLTbl, stMemLTbl,
diff, CB_NSTAGES);
/* get decoded residual from reversed vector */
for (k=0; k<diff; k++) {
decresidual[start_pos-1-k] = reverseDecresidual[k];
}
}
/* counter for predicted sub-frames */
subcount=0;
/* forward prediction of sub-frames */
Nfor = iLBCenc_inst->nsub-start-1;
if ( Nfor > 0 ) {
/* setup memory */
memset(mem, 0, (CB_MEML-STATE_LEN)*sizeof(float));
memcpy(mem+CB_MEML-STATE_LEN, decresidual+(start-1)*SUBL,
STATE_LEN*sizeof(float));
memset(weightState, 0, LPC_FILTERORDER*sizeof(float));
/* loop over sub-frames to encode */
for (subframe=0; subframe<Nfor; subframe++) {
/* encode sub-frame */
iCBSearch(iLBCenc_inst, cb_index+subcount*CB_NSTAGES,
gain_index+subcount*CB_NSTAGES,
&residual[(start+1+subframe)*SUBL],
mem+CB_MEML-memLfTbl[subcount],
memLfTbl[subcount], SUBL, CB_NSTAGES,
&weightdenum[(start+1+subframe)*
(LPC_FILTERORDER+1)],
weightState, subcount+1);
/* construct decoded vector */
iCBConstruct(&decresidual[(start+1+subframe)*SUBL],
cb_index+subcount*CB_NSTAGES,
gain_index+subcount*CB_NSTAGES,
mem+CB_MEML-memLfTbl[subcount],
memLfTbl[subcount], SUBL, CB_NSTAGES);
/* update memory */
memmove(mem, mem+SUBL, (CB_MEML-SUBL)*sizeof(float));
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memcpy(mem+CB_MEML-SUBL,
&decresidual[(start+1+subframe)*SUBL],
SUBL*sizeof(float));
memset(weightState, 0, LPC_FILTERORDER*sizeof(float));
subcount++;
}
}
/* backward prediction of sub-frames */
Nback = start-1;
if ( Nback > 0 ) {
/* create reverse order vectors */
for (n=0; n<Nback; n++) {
for (k=0; k<SUBL; k++) {
reverseResidual[n*SUBL+k] =
residual[(start-1)*SUBL-1-n*SUBL-k];
reverseDecresidual[n*SUBL+k] =
decresidual[(start-1)*SUBL-1-n*SUBL-k];
}
}
/* setup memory */
meml_gotten = SUBL*(iLBCenc_inst->nsub+1-start);
if ( meml_gotten > CB_MEML ) {
meml_gotten=CB_MEML;
}
for (k=0; k<meml_gotten; k++) {
mem[CB_MEML-1-k] = decresidual[(start-1)*SUBL + k];
}
memset(mem, 0, (CB_MEML-k)*sizeof(float));
memset(weightState, 0, LPC_FILTERORDER*sizeof(float));
/* loop over sub-frames to encode */
for (subframe=0; subframe<Nback; subframe++) {
/* encode sub-frame */
iCBSearch(iLBCenc_inst, cb_index+subcount*CB_NSTAGES,
gain_index+subcount*CB_NSTAGES,
&reverseResidual[subframe*SUBL],
mem+CB_MEML-memLfTbl[subcount],
memLfTbl[subcount], SUBL, CB_NSTAGES,
&weightdenum[(start-2-subframe)*
(LPC_FILTERORDER+1)],
weightState, subcount+1);
/* construct decoded vector */
iCBConstruct(&reverseDecresidual[subframe*SUBL],
cb_index+subcount*CB_NSTAGES,
gain_index+subcount*CB_NSTAGES,
mem+CB_MEML-memLfTbl[subcount],
memLfTbl[subcount], SUBL, CB_NSTAGES);
/* update memory */
memmove(mem, mem+SUBL, (CB_MEML-SUBL)*sizeof(float));
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memcpy(mem+CB_MEML-SUBL,
&reverseDecresidual[subframe*SUBL],
SUBL*sizeof(float));
memset(weightState, 0, LPC_FILTERORDER*sizeof(float));
subcount++;
}
/* get decoded residual from reversed vector */
for (i=0; i<SUBL*Nback; i++) {
decresidual[SUBL*Nback - i - 1] =
reverseDecresidual[i];
}
}
/* end encoding part */
/* adjust index */
index_conv_enc(cb_index);
/* pack bytes */
pbytes=bytes;
pos=0;
/* loop over the 3 ULP classes */
for (ulp=0; ulp<3; ulp++) {
/* LSF */
for (k=0; k<LSF_NSPLIT*iLBCenc_inst->lpc_n; k++) {
packsplit(&lsf_i[k], &firstpart, &lsf_i[k],
iLBCenc_inst->ULP_inst->lsf_bits[k][ulp],
iLBCenc_inst->ULP_inst->lsf_bits[k][ulp]+
iLBCenc_inst->ULP_inst->lsf_bits[k][ulp+1]+
iLBCenc_inst->ULP_inst->lsf_bits[k][ulp+2]);
dopack( &pbytes, firstpart,
iLBCenc_inst->ULP_inst->lsf_bits[k][ulp], &pos);
}
/* Start block info */
packsplit(&start, &firstpart, &start,
iLBCenc_inst->ULP_inst->start_bits[ulp],
iLBCenc_inst->ULP_inst->start_bits[ulp]+
iLBCenc_inst->ULP_inst->start_bits[ulp+1]+
iLBCenc_inst->ULP_inst->start_bits[ulp+2]);
dopack( &pbytes, firstpart,
iLBCenc_inst->ULP_inst->start_bits[ulp], &pos);
packsplit(&state_first, &firstpart, &state_first,
iLBCenc_inst->ULP_inst->startfirst_bits[ulp],
iLBCenc_inst->ULP_inst->startfirst_bits[ulp]+
iLBCenc_inst->ULP_inst->startfirst_bits[ulp+1]+
iLBCenc_inst->ULP_inst->startfirst_bits[ulp+2]);
dopack( &pbytes, firstpart,
iLBCenc_inst->ULP_inst->startfirst_bits[ulp], &pos);
packsplit(&idxForMax, &firstpart, &idxForMax,
iLBCenc_inst->ULP_inst->scale_bits[ulp],
iLBCenc_inst->ULP_inst->scale_bits[ulp]+
iLBCenc_inst->ULP_inst->scale_bits[ulp+1]+
iLBCenc_inst->ULP_inst->scale_bits[ulp+2]);
dopack( &pbytes, firstpart,
iLBCenc_inst->ULP_inst->scale_bits[ulp], &pos);
for (k=0; k<iLBCenc_inst->state_short_len; k++) {
packsplit(idxVec+k, &firstpart, idxVec+k,
iLBCenc_inst->ULP_inst->state_bits[ulp],
iLBCenc_inst->ULP_inst->state_bits[ulp]+
iLBCenc_inst->ULP_inst->state_bits[ulp+1]+
iLBCenc_inst->ULP_inst->state_bits[ulp+2]);
dopack( &pbytes, firstpart,
iLBCenc_inst->ULP_inst->state_bits[ulp], &pos);
}
/* 23/22 (20ms/30ms) sample block */
for (k=0;k<CB_NSTAGES;k++) {
packsplit(extra_cb_index+k, &firstpart,
extra_cb_index+k,
iLBCenc_inst->ULP_inst->extra_cb_index[k][ulp],
iLBCenc_inst->ULP_inst->extra_cb_index[k][ulp]+
iLBCenc_inst->ULP_inst->extra_cb_index[k][ulp+1]+
iLBCenc_inst->ULP_inst->extra_cb_index[k][ulp+2]);
dopack( &pbytes, firstpart,
iLBCenc_inst->ULP_inst->extra_cb_index[k][ulp],
&pos);
}
for (k=0;k<CB_NSTAGES;k++) {
packsplit(extra_gain_index+k, &firstpart,
extra_gain_index+k,
iLBCenc_inst->ULP_inst->extra_cb_gain[k][ulp],
iLBCenc_inst->ULP_inst->extra_cb_gain[k][ulp]+
iLBCenc_inst->ULP_inst->extra_cb_gain[k][ulp+1]+
iLBCenc_inst->ULP_inst->extra_cb_gain[k][ulp+2]);
dopack( &pbytes, firstpart,
iLBCenc_inst->ULP_inst->extra_cb_gain[k][ulp],
&pos);
}
/* The two/four (20ms/30ms) 40 sample sub-blocks */
for (i=0; i<iLBCenc_inst->nasub; i++) {
for (k=0; k<CB_NSTAGES; k++) {
packsplit(cb_index+i*CB_NSTAGES+k, &firstpart,
cb_index+i*CB_NSTAGES+k,
iLBCenc_inst->ULP_inst->cb_index[i][k][ulp],
iLBCenc_inst->ULP_inst->cb_index[i][k][ulp]+
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);
}