WebRtcIlbcfix_EnhancerInterface: Let input array be const

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

Index: webrtc/modules/audio_coding/codecs/ilbc/enhancer_interface.c
diff --git a/webrtc/modules/audio_coding/codecs/ilbc/enhancer_interface.c b/webrtc/modules/audio_coding/codecs/ilbc/enhancer_interface.c
index 61b9d2606a3f1132917ec301a23c52cd41858f76..1bd4b266bd0326da081bba48df0ba1941e3e5b5c 100644
--- a/webrtc/modules/audio_coding/codecs/ilbc/enhancer_interface.c
+++ b/webrtc/modules/audio_coding/codecs/ilbc/enhancer_interface.c
@@ -30,11 +30,11 @@
  * interface for enhancer
  *---------------------------------------------------------------*/
 
-size_t WebRtcIlbcfix_EnhancerInterface( /* (o) Estimated lag in end of in[] */
-    int16_t *out,     /* (o) enhanced signal */
-    int16_t *in,      /* (i) unenhanced signal */
-    IlbcDecoder *iLBCdec_inst /* (i) buffers etc */
-                                        ){
+size_t  // (o) Estimated lag in end of in[]
+    WebRtcIlbcfix_EnhancerInterface(
+        int16_t* out,                 // (o) enhanced signal
+        const int16_t* in,            // (i) unenhanced signal
+        IlbcDecoder* iLBCdec_inst) {  // (i) buffers etc
   size_t iblock;
   size_t lag=20, tlag=20;
   size_t inLen=iLBCdec_inst->blockl+120;
@@ -54,7 +54,7 @@ size_t WebRtcIlbcfix_EnhancerInterface( /* (o) Estimated lag in end of in[] */
   int16_t *tmpW16ptr;
   size_t startPos;
   int16_t *plc_pred;
-  int16_t *target, *regressor;
+  const int16_t *target, *regressor;
   int16_t max16;
   int shifts;
   int32_t ener;