iLBC: Some const annotations

webrtc/modules/audio_coding/codecs/ilbc/create_augmented_vec.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.
  */
 
 /******************************************************************
 
  iLBC Speech Coder ANSI-C Source Code
 
  WebRtcIlbcfix_CreateAugmentedVec.h
 
 ******************************************************************/
 
 #ifndef WEBRTC_MODULES_AUDIO_CODING_CODECS_ILBC_MAIN_SOURCE_CREATE_AUGMENTED_VEC_H_
 #define WEBRTC_MODULES_AUDIO_CODING_CODECS_ILBC_MAIN_SOURCE_CREATE_AUGMENTED_VEC_H_
 
 #include "defines.h"
 
 /*----------------------------------------------------------------*
  *  Recreate a specific codebook vector from the augmented part.
  *
  *----------------------------------------------------------------*/
 
 void WebRtcIlbcfix_CreateAugmentedVec(
-    size_t index,  /* (i) Index for the augmented vector to be created */
-    int16_t *buffer,  /* (i) Pointer to the end of the codebook memory that
-                                           is used for creation of the augmented codebook */
-    int16_t *cbVec  /* (o) The construced codebook vector */
-                                      );
+    size_t index,          /* (i) Index for the augmented vector to be
+                              created */
+    const int16_t* buffer, /* (i) Pointer to the end of the codebook memory
+                              that is used for creation of the augmented
+                              codebook */
+    int16_t* cbVec);       /* (o) The construced codebook vector */
 
 #endif