182 lines
4.6 KiB
C
182 lines
4.6 KiB
C
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/******************************************************************
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iLBC Speech Coder ANSI-C Source Code
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getCBvec.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 "iLBC_define.h"
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#include "getCBvec.h"
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#include "constants.h"
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#include <string.h>
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/*----------------------------------------------------------------*
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* Construct codebook vector for given index.
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*---------------------------------------------------------------*/
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void getCBvec(
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float *cbvec, /* (o) Constructed codebook vector */
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float *mem, /* (i) Codebook buffer */
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int index, /* (i) Codebook index */
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int lMem, /* (i) Length of codebook buffer */
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int cbveclen/* (i) Codebook vector length */
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){
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int j, k, n, memInd, sFilt;
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float tmpbuf[CB_MEML];
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int base_size;
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int ilow, ihigh;
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float alfa, alfa1;
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/* Determine size of codebook sections */
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base_size=lMem-cbveclen+1;
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if (cbveclen==SUBL) {
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base_size+=cbveclen/2;
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}
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/* No filter -> First codebook section */
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if (index<lMem-cbveclen+1) {
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/* first non-interpolated vectors */
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k=index+cbveclen;
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/* get vector */
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memcpy(cbvec, mem+lMem-k, cbveclen*sizeof(float));
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} else if (index < base_size) {
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k=2*(index-(lMem-cbveclen+1))+cbveclen;
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ihigh=k/2;
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ilow=ihigh-5;
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/* Copy first noninterpolated part */
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memcpy(cbvec, mem+lMem-k/2, ilow*sizeof(float));
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/* interpolation */
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alfa1=(float)0.2;
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alfa=0.0;
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for (j=ilow; j<ihigh; j++) {
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cbvec[j]=((float)1.0-alfa)*mem[lMem-k/2+j]+
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alfa*mem[lMem-k+j];
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alfa+=alfa1;
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}
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/* Copy second noninterpolated part */
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memcpy(cbvec+ihigh, mem+lMem-k+ihigh,
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(cbveclen-ihigh)*sizeof(float));
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}
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/* Higher codebbok section based on filtering */
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else {
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/* first non-interpolated vectors */
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if (index-base_size<lMem-cbveclen+1) {
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float tempbuff2[CB_MEML+CB_FILTERLEN+1];
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float *pos;
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float *pp, *pp1;
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memset(tempbuff2, 0,
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CB_HALFFILTERLEN*sizeof(float));
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memcpy(&tempbuff2[CB_HALFFILTERLEN], mem,
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lMem*sizeof(float));
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memset(&tempbuff2[lMem+CB_HALFFILTERLEN], 0,
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(CB_HALFFILTERLEN+1)*sizeof(float));
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k=index-base_size+cbveclen;
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sFilt=lMem-k;
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memInd=sFilt+1-CB_HALFFILTERLEN;
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/* do filtering */
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pos=cbvec;
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memset(pos, 0, cbveclen*sizeof(float));
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for (n=0; n<cbveclen; n++) {
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pp=&tempbuff2[memInd+n+CB_HALFFILTERLEN];
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pp1=&cbfiltersTbl[CB_FILTERLEN-1];
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for (j=0; j<CB_FILTERLEN; j++) {
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(*pos)+=(*pp++)*(*pp1--);
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}
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pos++;
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}
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}
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/* interpolated vectors */
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else {
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float tempbuff2[CB_MEML+CB_FILTERLEN+1];
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float *pos;
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float *pp, *pp1;
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int i;
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memset(tempbuff2, 0,
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CB_HALFFILTERLEN*sizeof(float));
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memcpy(&tempbuff2[CB_HALFFILTERLEN], mem,
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lMem*sizeof(float));
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memset(&tempbuff2[lMem+CB_HALFFILTERLEN], 0,
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(CB_HALFFILTERLEN+1)*sizeof(float));
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k=2*(index-base_size-
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(lMem-cbveclen+1))+cbveclen;
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sFilt=lMem-k;
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memInd=sFilt+1-CB_HALFFILTERLEN;
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/* do filtering */
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pos=&tmpbuf[sFilt];
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memset(pos, 0, k*sizeof(float));
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for (i=0; i<k; i++) {
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pp=&tempbuff2[memInd+i+CB_HALFFILTERLEN];
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pp1=&cbfiltersTbl[CB_FILTERLEN-1];
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for (j=0; j<CB_FILTERLEN; j++) {
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(*pos)+=(*pp++)*(*pp1--);
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}
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pos++;
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}
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ihigh=k/2;
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ilow=ihigh-5;
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/* Copy first noninterpolated part */
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memcpy(cbvec, tmpbuf+lMem-k/2,
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ilow*sizeof(float));
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/* interpolation */
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alfa1=(float)0.2;
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alfa=0.0;
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for (j=ilow; j<ihigh; j++) {
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cbvec[j]=((float)1.0-alfa)*
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tmpbuf[lMem-k/2+j]+alfa*tmpbuf[lMem-k+j];
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alfa+=alfa1;
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}
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/* Copy second noninterpolated part */
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memcpy(cbvec+ihigh, tmpbuf+lMem-k+ihigh,
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(cbveclen-ihigh)*sizeof(float));
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}
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}
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}
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