aboutsummaryrefslogtreecommitdiffstats
path: root/codecs/ilbc/FrameClassify.c
diff options
context:
space:
mode:
Diffstat (limited to 'codecs/ilbc/FrameClassify.c')
-rw-r--r--codecs/ilbc/FrameClassify.c110
1 files changed, 0 insertions, 110 deletions
diff --git a/codecs/ilbc/FrameClassify.c b/codecs/ilbc/FrameClassify.c
deleted file mode 100644
index c982fd667..000000000
--- a/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;
-}
-
-