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-
- #include "iLBC_define.h"
- #include "constants.h"
- #include <string.h>
-
- void getCBvec(
- float *cbvec,
- float *mem,
- int index,
- int lMem,
- int cbveclen
- ){
- int j, k, n, memInd, sFilt;
- float tmpbuf[CB_MEML];
- int base_size;
- int ilow, ihigh;
- float alfa, alfa1;
-
- base_size=lMem-cbveclen+1;
- if (cbveclen==SUBL) {
- base_size+=cbveclen/2;
- }
-
- if (index<lMem-cbveclen+1) {
-
- k=index+cbveclen;
-
- memcpy(cbvec, mem+lMem-k, cbveclen*sizeof(float));
- } else if (index < base_size) {
- k=2*(index-(lMem-cbveclen+1))+cbveclen;
- ihigh=k/2;
- ilow=ihigh-5;
-
- memcpy(cbvec, mem+lMem-k/2, ilow*sizeof(float));
-
- alfa1=(float)0.2;
- alfa=0.0;
- for (j=ilow; j<ihigh; j++) {
- cbvec[j]=((float)1.0-alfa)*mem[lMem-k/2+j]+
- alfa*mem[lMem-k+j];
- alfa+=alfa1;
- }
-
- memcpy(cbvec+ihigh, mem+lMem-k+ihigh,
- (cbveclen-ihigh)*sizeof(float));
- }
-
- else {
-
- if (index-base_size<lMem-cbveclen+1) {
- float tempbuff2[CB_MEML+CB_FILTERLEN+1];
- float *pos;
- float *pp, *pp1;
- memset(tempbuff2, 0,
- CB_HALFFILTERLEN*sizeof(float));
- memcpy(&tempbuff2[CB_HALFFILTERLEN], mem,
- lMem*sizeof(float));
- memset(&tempbuff2[lMem+CB_HALFFILTERLEN], 0,
- (CB_HALFFILTERLEN+1)*sizeof(float));
- k=index-base_size+cbveclen;
- sFilt=lMem-k;
- memInd=sFilt+1-CB_HALFFILTERLEN;
-
- pos=cbvec;
- memset(pos, 0, cbveclen*sizeof(float));
- for (n=0; n<cbveclen; n++) {
- pp=&tempbuff2[memInd+n+CB_HALFFILTERLEN];
- pp1=&cbfiltersTbl[CB_FILTERLEN-1];
- for (j=0; j<CB_FILTERLEN; j++) {
- (*pos)+=(*pp++)*(*pp1--);
- }
- pos++;
- }
- }
-
- else {
- float tempbuff2[CB_MEML+CB_FILTERLEN+1];
- float *pos;
- float *pp, *pp1;
- int i;
- memset(tempbuff2, 0,
- CB_HALFFILTERLEN*sizeof(float));
- memcpy(&tempbuff2[CB_HALFFILTERLEN], mem,
- lMem*sizeof(float));
- memset(&tempbuff2[lMem+CB_HALFFILTERLEN], 0,
- (CB_HALFFILTERLEN+1)*sizeof(float));
- k=2*(index-base_size-
- (lMem-cbveclen+1))+cbveclen;
- sFilt=lMem-k;
- memInd=sFilt+1-CB_HALFFILTERLEN;
-
- pos=&tmpbuf[sFilt];
- memset(pos, 0, k*sizeof(float));
- for (i=0; i<k; i++) {
- pp=&tempbuff2[memInd+i+CB_HALFFILTERLEN];
- pp1=&cbfiltersTbl[CB_FILTERLEN-1];
- for (j=0; j<CB_FILTERLEN; j++) {
- (*pos)+=(*pp++)*(*pp1--);
- }
- pos++;
- }
- ihigh=k/2;
- ilow=ihigh-5;
-
- memcpy(cbvec, tmpbuf+lMem-k/2,
- ilow*sizeof(float));
-
- alfa1=(float)0.2;
- alfa=0.0;
- for (j=ilow; j<ihigh; j++) {
- cbvec[j]=((float)1.0-alfa)*
- tmpbuf[lMem-k/2+j]+alfa*tmpbuf[lMem-k+j];
- alfa+=alfa1;
- }
-
- memcpy(cbvec+ihigh, tmpbuf+lMem-k+ihigh,
- (cbveclen-ihigh)*sizeof(float));
- }
- }
- }
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