1 files changed, 112 insertions, 0 deletions
diff --git a/codecs/ilbc/iCBConstruct.c b/codecs/ilbc/iCBConstruct.c
new file mode 100644
index 000000000..ee9a73ca5
--- /dev/null
+++ b/codecs/ilbc/iCBConstruct.c
@@ -0,0 +1,112 @@
+
+   /******************************************************************
+
+       iLBC Speech Coder ANSI-C Source Code
+
+       iCBConstruct.c
+
+       Copyright (C) The Internet Society (2004).
+       All Rights Reserved.
+
+   ******************************************************************/
+
+   #include <math.h>
+
+   #include "iLBC_define.h"
+   #include "gainquant.h"
+   #include "getCBvec.h"
+
+   /*----------------------------------------------------------------*
+    *  Convert the codebook indexes to make the search easier
+    *---------------------------------------------------------------*/
+
+
+
+
+
+
+   void index_conv_enc(
+       int *index          /* (i/o) Codebook indexes */
+   ){
+       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 */
+           }
+       }
+   }
+
+   void index_conv_dec(
+       int *index          /* (i/o) Codebook indexes */
+   ){
+       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 */
+           }
+       }
+   }
+
+   /*----------------------------------------------------------------*
+    *  Construct decoded vector from codebook and gains.
+    *---------------------------------------------------------------*/
+
+   void iCBConstruct(
+       float *decvector,   /* (o) Decoded vector */
+       int *index,         /* (i) Codebook indices */
+       int *gain_index,/* (i) Gain quantization indices */
+       float *mem,         /* (i) Buffer for codevector construction */
+       int lMem,           /* (i) Length of buffer */
+       int veclen,         /* (i) Length of vector */
+       int nStages         /* (i) Number of codebook stages */
+   ){
+       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];
+               }
+           }
+       }
+   }
+