StateSearchW.c File Reference

#include <math.h>
#include <string.h>
#include "iLBC_define.h"
#include "constants.h"
#include "filter.h"
#include "helpfun.h"

Include dependency graph for StateSearchW.c:

Go to the source code of this file.

Functions
void	AbsQuantW (iLBC_Enc_Inst_t *iLBCenc_inst, float *in, float *syntDenum, float *weightDenum, int *out, int len, int state_first)
void	StateSearchW (iLBC_Enc_Inst_t *iLBCenc_inst, float *residual, float *syntDenum, float *weightDenum, int *idxForMax, int *idxVec, int len, int state_first)

Function Documentation

AbsQuantW()

void AbsQuantW	(	iLBC_Enc_Inst_t *	iLBCenc_inst,
		float *	in,
		float *	syntDenum,
		float *	weightDenum,
		int *	out,
		int	len,
		int	state_first
	)

Definition at line 26 of file StateSearchW.c.

References AllPoleFilter(), len(), LPC_FILTERORDER, sort_sq(), iLBC_Enc_Inst_t_::state_short_len, STATE_SHORT_LEN_30MS, state_sq3Tbl, and SUBL.

Referenced by StateSearchW().

 {
 float *syntOut;
 float syntOutBuf[LPC_FILTERORDER+STATE_SHORT_LEN_30MS];
 float toQ, xq;
 int n;
 int index;

 /* initialization of buffer for filtering */

 memset(syntOutBuf, 0, LPC_FILTERORDER*sizeof(float));






 /* initialization of pointer for filtering */

 syntOut = &syntOutBuf[LPC_FILTERORDER];

 /* synthesis and weighting filters on input */

 if (state_first) {
 AllPoleFilter (in, weightDenum, SUBL, LPC_FILTERORDER);
 } else {
 AllPoleFilter (in, weightDenum,
 iLBCenc_inst->state_short_len-SUBL,
 LPC_FILTERORDER);
 }

 /* encoding loop */

 for (n=0; n<len; n++) {

 /* time update of filter coefficients */

 if ((state_first)&&(n==SUBL)){
 syntDenum += (LPC_FILTERORDER+1);
 weightDenum += (LPC_FILTERORDER+1);

 /* synthesis and weighting filters on input */
 AllPoleFilter (&in[n], weightDenum, len-n,
 LPC_FILTERORDER);

 } else if ((state_first==0)&&
 (n==(iLBCenc_inst->state_short_len-SUBL))) {
 syntDenum += (LPC_FILTERORDER+1);
 weightDenum += (LPC_FILTERORDER+1);

 /* synthesis and weighting filters on input */
 AllPoleFilter (&in[n], weightDenum, len-n,
 LPC_FILTERORDER);

 }

 /* prediction of synthesized and weighted input */

 syntOut[n] = 0.0;
 AllPoleFilter (&syntOut[n], weightDenum, 1,
 LPC_FILTERORDER);

 /* quantization */

 toQ = in[n]-syntOut[n];





 sort_sq(&xq, &index, toQ, state_sq3Tbl, 8);
 out[n]=index;
 syntOut[n] = state_sq3Tbl[out[n]];

 /* update of the prediction filter */

 AllPoleFilter(&syntOut[n], weightDenum, 1,
 LPC_FILTERORDER);
 }
 }

StateSearchW()

void StateSearchW	(	iLBC_Enc_Inst_t *	iLBCenc_inst,
		float *	residual,
		float *	syntDenum,
		float *	weightDenum,
		int *	idxForMax,
		int *	idxVec,
		int	len,
		int	state_first
	)

Definition at line 121 of file StateSearchW.c.

References AbsQuantW(), len(), LPC_FILTERORDER, sort_sq(), state_frgqTbl, STATE_SHORT_LEN_30MS, tmp(), and ZeroPoleFilter().

Referenced by iLBC_encode().

 {
 float dtmp, maxVal;
 float tmpbuf[LPC_FILTERORDER+2*STATE_SHORT_LEN_30MS];
 float *tmp, numerator[1+LPC_FILTERORDER];
 float foutbuf[LPC_FILTERORDER+2*STATE_SHORT_LEN_30MS], *fout;
 int k;
 float qmax, scal;

 /* initialization of buffers and filter coefficients */

 memset(tmpbuf, 0, LPC_FILTERORDER*sizeof(float));
 memset(foutbuf, 0, LPC_FILTERORDER*sizeof(float));
 for (k=0; k<LPC_FILTERORDER; k++) {
 numerator[k]=syntDenum[LPC_FILTERORDER-k];
 }
 numerator[LPC_FILTERORDER]=syntDenum[0];
 tmp = &tmpbuf[LPC_FILTERORDER];
 fout = &foutbuf[LPC_FILTERORDER];

 /* circular convolution with the all-pass filter */






 memcpy(tmp, residual, len*sizeof(float));
 memset(tmp+len, 0, len*sizeof(float));
 ZeroPoleFilter(tmp, numerator, syntDenum, 2*len,
 LPC_FILTERORDER, fout);
 for (k=0; k<len; k++) {
 fout[k] += fout[k+len];
 }

 /* identification of the maximum amplitude value */

 maxVal = fout[0];
 for (k=1; k<len; k++) {

 if (fout[k]*fout[k] > maxVal*maxVal){
 maxVal = fout[k];
 }
 }
 maxVal=(float)fabs(maxVal);

 /* encoding of the maximum amplitude value */

 if (maxVal < 10.0) {
 maxVal = 10.0;
 }
 maxVal = (float)log10(maxVal);
 sort_sq(&dtmp, idxForMax, maxVal, state_frgqTbl, 64);

 /* decoding of the maximum amplitude representation value,
 and corresponding scaling of start state */

 maxVal=state_frgqTbl[*idxForMax];
 qmax = (float)pow(10,maxVal);
 scal = (float)(4.5)/qmax;
 for (k=0; k<len; k++){
 fout[k] *= scal;
 }

 /* predictive noise shaping encoding of scaled start state */

 AbsQuantW(iLBCenc_inst, fout,syntDenum,
 weightDenum,idxVec, len, state_first);
 }