iLBC: Some const annotations

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

Index: webrtc/modules/audio_coding/codecs/ilbc/create_augmented_vec.c
diff --git a/webrtc/modules/audio_coding/codecs/ilbc/create_augmented_vec.c b/webrtc/modules/audio_coding/codecs/ilbc/create_augmented_vec.c
index 5e1c217e26f85476c926696bf1be29a8546ac4b0..4dcf49b6e7b76f6893276d658b0a5658e5fc3bd4 100644
--- a/webrtc/modules/audio_coding/codecs/ilbc/create_augmented_vec.c
+++ b/webrtc/modules/audio_coding/codecs/ilbc/create_augmented_vec.c
@@ -26,13 +26,14 @@
  *----------------------------------------------------------------*/
 
 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 constructed 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 constructed codebook vector */
   size_t ilow;
-  int16_t *ppo, *ppi;
+  const int16_t *ppo, *ppi;
   int16_t cbVecTmp[4];
   /* Interpolation starts 4 elements before cbVec+index, but must not start
      outside |cbVec|; clamping interp_len to stay within |cbVec|.