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Diffstat (limited to 'trunk/codecs/ilbc/createCB.c')
| -rw-r--r-- | trunk/codecs/ilbc/createCB.c | 216 |
1 files changed, 0 insertions, 216 deletions
diff --git a/trunk/codecs/ilbc/createCB.c b/trunk/codecs/ilbc/createCB.c deleted file mode 100644 index a7efd9380..000000000 --- a/trunk/codecs/ilbc/createCB.c +++ /dev/null @@ -1,216 +0,0 @@ - - - -/****************************************************************** - - iLBC Speech Coder ANSI-C Source Code - - createCB.c - - Copyright (C) The Internet Society (2004). - All Rights Reserved. - -******************************************************************/ - -#include "iLBC_define.h" -#include "createCB.h" -#include "constants.h" -#include <string.h> -#include <math.h> - -/*----------------------------------------------------------------* - * Construct an additional codebook vector by filtering the - * initial codebook buffer. This vector is then used to expand - * the codebook with an additional section. - *---------------------------------------------------------------*/ - -void filteredCBvecs( - float *cbvectors, /* (o) Codebook vectors for the - higher section */ - float *mem, /* (i) Buffer to create codebook - vector from */ - int lMem /* (i) Length of buffer */ -){ - int j, k; - float *pp, *pp1; - float tempbuff2[CB_MEML+CB_FILTERLEN]; - float *pos; - - memset(tempbuff2, 0, (CB_HALFFILTERLEN-1)*sizeof(float)); - memcpy(&tempbuff2[CB_HALFFILTERLEN-1], mem, lMem*sizeof(float)); - memset(&tempbuff2[lMem+CB_HALFFILTERLEN-1], 0, - (CB_HALFFILTERLEN+1)*sizeof(float)); - - /* Create codebook vector for higher section by filtering */ - - /* do filtering */ - pos=cbvectors; - memset(pos, 0, lMem*sizeof(float)); - for (k=0; k<lMem; k++) { - pp=&tempbuff2[k]; - pp1=&cbfiltersTbl[CB_FILTERLEN-1]; - for (j=0;j<CB_FILTERLEN;j++) { - (*pos)+=(*pp++)*(*pp1--); - } - pos++; - } -} - - - -/*----------------------------------------------------------------* - * Search the augmented part of the codebook to find the best - * measure. - *----------------------------------------------------------------*/ - -void searchAugmentedCB( - int low, /* (i) Start index for the search */ - int high, /* (i) End index for the search */ - int stage, /* (i) Current stage */ - int startIndex, /* (i) Codebook index for the first - aug vector */ - float *target, /* (i) Target vector for encoding */ - float *buffer, /* (i) Pointer to the end of the buffer for - augmented codebook construction */ - float *max_measure, /* (i/o) Currently maximum measure */ - int *best_index,/* (o) Currently the best index */ - float *gain, /* (o) Currently the best gain */ - float *energy, /* (o) Energy of augmented codebook - vectors */ - float *invenergy/* (o) Inv energy of augmented codebook - vectors */ -) { - int icount, ilow, j, tmpIndex; - float *pp, *ppo, *ppi, *ppe, crossDot, alfa; - float weighted, measure, nrjRecursive; - float ftmp; - - /* Compute the energy for the first (low-5) - noninterpolated samples */ - nrjRecursive = (float) 0.0; - pp = buffer - low + 1; - for (j=0; j<(low-5); j++) { - nrjRecursive += ( (*pp)*(*pp) ); - pp++; - } - ppe = buffer - low; - - - for (icount=low; icount<=high; icount++) { - - /* Index of the codebook vector used for retrieving - energy values */ - tmpIndex = startIndex+icount-20; - - ilow = icount-4; - - /* Update the energy recursively to save complexity */ - nrjRecursive = nrjRecursive + (*ppe)*(*ppe); - ppe--; - energy[tmpIndex] = nrjRecursive; - - /* Compute cross dot product for the first (low-5) - samples */ - crossDot = (float) 0.0; - - - pp = buffer-icount; - for (j=0; j<ilow; j++) { - crossDot += target[j]*(*pp++); - } - - /* interpolation */ - alfa = (float) 0.2; - ppo = buffer-4; - ppi = buffer-icount-4; - for (j=ilow; j<icount; j++) { - weighted = ((float)1.0-alfa)*(*ppo)+alfa*(*ppi); - ppo++; - ppi++; - energy[tmpIndex] += weighted*weighted; - crossDot += target[j]*weighted; - alfa += (float)0.2; - } - - /* Compute energy and cross dot product for the - remaining samples */ - pp = buffer - icount; - for (j=icount; j<SUBL; j++) { - energy[tmpIndex] += (*pp)*(*pp); - crossDot += target[j]*(*pp++); - } - - if (energy[tmpIndex]>0.0) { - invenergy[tmpIndex]=(float)1.0/(energy[tmpIndex]+EPS); - } else { - invenergy[tmpIndex] = (float) 0.0; - } - - if (stage==0) { - measure = (float)-10000000.0; - - if (crossDot > 0.0) { - measure = crossDot*crossDot*invenergy[tmpIndex]; - } - } - else { - measure = crossDot*crossDot*invenergy[tmpIndex]; - } - - /* check if measure is better */ - ftmp = crossDot*invenergy[tmpIndex]; - - if ((measure>*max_measure) && (fabs(ftmp)<CB_MAXGAIN)) { - *best_index = tmpIndex; - *max_measure = measure; - *gain = ftmp; - } - } -} - - - - -/*----------------------------------------------------------------* - * Recreate a specific codebook vector from the augmented part. - * - *----------------------------------------------------------------*/ - -void createAugmentedVec( - int index, /* (i) Index for the augmented vector - to be created */ - float *buffer, /* (i) Pointer to the end of the buffer for - augmented codebook construction */ - float *cbVec/* (o) The construced codebook vector */ -) { - int ilow, j; - float *pp, *ppo, *ppi, alfa, alfa1, weighted; - - ilow = index-5; - - /* copy the first noninterpolated part */ - - pp = buffer-index; - memcpy(cbVec,pp,sizeof(float)*index); - - /* interpolation */ - - alfa1 = (float)0.2; - alfa = 0.0; - ppo = buffer-5; - ppi = buffer-index-5; - for (j=ilow; j<index; j++) { - weighted = ((float)1.0-alfa)*(*ppo)+alfa*(*ppi); - ppo++; - ppi++; - cbVec[j] = weighted; - alfa += alfa1; - } - - /* copy the second noninterpolated part */ - - pp = buffer - index; - memcpy(cbVec+index,pp,sizeof(float)*(SUBL-index)); -} - - |