iCBConstruct.c File Reference

#include <math.h>
#include "iLBC_define.h"
#include "gainquant.h"
#include "getCBvec.h"

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Functions
void	iCBConstruct (float *decvector, int *index, int *gain_index, float *mem, int lMem, int veclen, int nStages)
void	index_conv_dec (int *index)
void	index_conv_enc (int *index)

Function Documentation

iCBConstruct()

void iCBConstruct	(	float *	decvector,
		int *	index,
		int *	gain_index,
		float *	mem,
		int	lMem,
		int	veclen,
		int	nStages
	)

Definition at line 66 of file iCBConstruct.c.

    {
       int j,k;
 
 
 
 
 
       float gain[CB_NSTAGES];
       float cbvec[SUBL];
 
       /* gain de-quantization */
 
       gain[0] = gaindequant(gain_index[0], 1.0, 32);
       if (nStages > 1) {
           gain[1] = gaindequant(gain_index[1],
               (float)fabs(gain[0]), 16);
       }
       if (nStages > 2) {
           gain[2] = gaindequant(gain_index[2],
               (float)fabs(gain[1]), 8);
       }
 
       /* codebook vector construction and construction of
       total vector */
 
       getCBvec(cbvec, mem, index[0], lMem, veclen);
       for (j=0;j<veclen;j++){
           decvector[j] = gain[0]*cbvec[j];
       }
       if (nStages > 1) {
           for (k=1; k<nStages; k++) {
               getCBvec(cbvec, mem, index[k], lMem, veclen);
               for (j=0;j<veclen;j++) {
                   decvector[j] += gain[k]*cbvec[j];
               }
           }
       }
   }

References CB_NSTAGES, gaindequant(), getCBvec(), and SUBL.

Referenced by Decode(), and iLBC_encode().

index_conv_dec()

void index_conv_dec

(

int *

index

)

Definition at line 45 of file iCBConstruct.c.

    {
       int k;
 
       for (k=1; k<CB_NSTAGES; k++) {
 
           if ((index[k]>=44)&&(index[k]<108)) {
               index[k]+=64;
           } else if ((index[k]>=108)&&(index[k]<128)) {
               index[k]+=128;
           } else {
               /* ERROR */
           }
       }
   }

References CB_NSTAGES.

Referenced by iLBC_decode().

index_conv_enc()

void index_conv_enc

(

int *

index

)

Definition at line 28 of file iCBConstruct.c.

    {
       int k;
 
       for (k=1; k<CB_NSTAGES; k++) {
 
           if ((index[k]>=108)&&(index[k]<172)) {
               index[k]-=64;
           } else if (index[k]>=236) {
               index[k]-=128;
           } else {
               /* ERROR */
           }
       }
   }

References CB_NSTAGES.

Referenced by iLBC_encode().