iLBC: Some const annotations

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

 /*
  *  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.
  */
 
@@ skipping 10 matching lines @@
 
 #include <stdbool.h>
 #include "defines.h"
 
 /*----------------------------------------------------------------*
  *  Construct decoded vector from codebook and gains.
  *---------------------------------------------------------------*/
 
 // Returns true on success, false on failure.
 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 */
     ) WARN_UNUSED_RESULT;
 
 #endif