diff options
Diffstat (limited to '1.2-netsec/codecs/ilbc/FrameClassify.c')
-rw-r--r-- | 1.2-netsec/codecs/ilbc/FrameClassify.c | 110 |
1 files changed, 0 insertions, 110 deletions
diff --git a/1.2-netsec/codecs/ilbc/FrameClassify.c b/1.2-netsec/codecs/ilbc/FrameClassify.c deleted file mode 100644 index c982fd667..000000000 --- a/1.2-netsec/codecs/ilbc/FrameClassify.c +++ /dev/null @@ -1,110 +0,0 @@ - -/****************************************************************** - - iLBC Speech Coder ANSI-C Source Code - - FrameClassify.c - - Copyright (C) The Internet Society (2004). - All Rights Reserved. - -******************************************************************/ - -#include "iLBC_define.h" -#include "FrameClassify.h" - -/*---------------------------------------------------------------* - * Classification of subframes to localize start state - *--------------------------------------------------------------*/ - -int FrameClassify( /* index to the max-energy sub-frame */ - iLBC_Enc_Inst_t *iLBCenc_inst, - /* (i/o) the encoder state structure */ - float *residual /* (i) lpc residual signal */ -) { - float max_ssqEn, fssqEn[NSUB_MAX], bssqEn[NSUB_MAX], *pp; - int n, l, max_ssqEn_n; - const float ssqEn_win[NSUB_MAX-1]={(float)0.8,(float)0.9, - (float)1.0,(float)0.9,(float)0.8}; - const float sampEn_win[5]={(float)1.0/(float)6.0, - (float)2.0/(float)6.0, (float)3.0/(float)6.0, - (float)4.0/(float)6.0, (float)5.0/(float)6.0}; - - /* init the front and back energies to zero */ - - memset(fssqEn, 0, NSUB_MAX*sizeof(float)); - memset(bssqEn, 0, NSUB_MAX*sizeof(float)); - - /* Calculate front of first seqence */ - - n=0; - pp=residual; - - - for (l=0; l<5; l++) { - fssqEn[n] += sampEn_win[l] * (*pp) * (*pp); - pp++; - } - for (l=5; l<SUBL; l++) { - fssqEn[n] += (*pp) * (*pp); - pp++; - } - - /* Calculate front and back of all middle sequences */ - - for (n=1; n<iLBCenc_inst->nsub-1; n++) { - pp=residual+n*SUBL; - for (l=0; l<5; l++) { - fssqEn[n] += sampEn_win[l] * (*pp) * (*pp); - bssqEn[n] += (*pp) * (*pp); - pp++; - } - for (l=5; l<SUBL-5; l++) { - fssqEn[n] += (*pp) * (*pp); - bssqEn[n] += (*pp) * (*pp); - pp++; - } - for (l=SUBL-5; l<SUBL; l++) { - fssqEn[n] += (*pp) * (*pp); - bssqEn[n] += sampEn_win[SUBL-l-1] * (*pp) * (*pp); - pp++; - } - } - - /* Calculate back of last seqence */ - - n=iLBCenc_inst->nsub-1; - pp=residual+n*SUBL; - for (l=0; l<SUBL-5; l++) { - bssqEn[n] += (*pp) * (*pp); - pp++; - } - for (l=SUBL-5; l<SUBL; l++) { - bssqEn[n] += sampEn_win[SUBL-l-1] * (*pp) * (*pp); - pp++; - } - - /* find the index to the weighted 80 sample with - most energy */ - - if (iLBCenc_inst->mode==20) l=1; - else l=0; - - max_ssqEn=(fssqEn[0]+bssqEn[1])*ssqEn_win[l]; - max_ssqEn_n=1; - for (n=2; n<iLBCenc_inst->nsub; n++) { - - l++; - - - if ((fssqEn[n-1]+bssqEn[n])*ssqEn_win[l] > max_ssqEn) { - max_ssqEn=(fssqEn[n-1]+bssqEn[n]) * - ssqEn_win[l]; - max_ssqEn_n=n; - } - } - - return max_ssqEn_n; -} - - |