iLBC: Some const annotations

webrtc/modules/audio_coding/codecs/ilbc/cb_construct.c

 /*
  *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 /******************************************************************
 
  iLBC Speech Coder ANSI-C Source Code
 
  WebRtcIlbcfix_CbConstruct.c
 
 ******************************************************************/
 
 #include "cb_construct.h"
 
 #include "defines.h"
 #include "gain_dequant.h"
 #include "get_cd_vec.h"
 
 /*----------------------------------------------------------------*
  *  Construct decoded vector from codebook and gains.
  *---------------------------------------------------------------*/
 
 bool WebRtcIlbcfix_CbConstruct(
-    int16_t *decvector,  /* (o) Decoded vector */
-    int16_t *index,   /* (i) Codebook indices */
-    int16_t *gain_index,  /* (i) Gain quantization indices */
-    int16_t *mem,   /* (i) Buffer for codevector construction */
-    size_t lMem,   /* (i) Length of buffer */
-    size_t veclen   /* (i) Length of vector */
-                               ){
+    int16_t* decvector,        /* (o) Decoded vector */
+    const int16_t* index,      /* (i) Codebook indices */
+    const int16_t* gain_index, /* (i) Gain quantization indices */
+    int16_t* mem,              /* (i) Buffer for codevector construction */
+    size_t lMem,               /* (i) Length of buffer */
+    size_t veclen) {           /* (i) Length of vector */
   size_t j;
   int16_t gain[CB_NSTAGES];
   /* Stack based */
   int16_t cbvec0[SUBL];
   int16_t cbvec1[SUBL];
   int16_t cbvec2[SUBL];
   int32_t a32;
   int16_t *gainPtr;
 
   /* gain de-quantization */
@@ skipping 16 matching lines @@
   for (j=0;j<veclen;j++) {
     a32 = (*gainPtr++) * cbvec0[j];
     a32 += (*gainPtr++) * cbvec1[j];
     a32 += (*gainPtr) * cbvec2[j];
     gainPtr -= 2;
     decvector[j] = (int16_t)((a32 + 8192) >> 14);
   }
 
   return true;  // Success.
 }