WebRtcIlbcfix_EnhancerInterface: Let input array be const

webrtc/modules/audio_coding/codecs/ilbc/enhancer_interface.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.
  */
 
@@ skipping 12 matching lines @@
 #include "xcorr_coef.h"
 #include "enhancer.h"
 #include "hp_output.h"
 
 
 
 /*----------------------------------------------------------------*
  * 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;
   int16_t scale, scale1;
   size_t plc_blockl;
   int16_t *enh_buf;
   size_t *enh_period;
   int32_t tmp1, tmp2, max;
   size_t new_blocks;
   int16_t *enh_bufPtr1;
   size_t i;
   size_t k;
   int16_t EnChange;
   int16_t SqrtEnChange;
   int16_t inc;
   int16_t win;
   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;
   int16_t enerSh;
   int16_t corrSh;
   size_t ind;
   int16_t sh;
   size_t start, stop;
   /* Stack based */
   int16_t totsh[3];
@@ skipping 300 matching lines @@
     WebRtcIlbcfix_Enhancer(out + iblock * ENH_BLOCKL,
                            enh_buf,
                            ENH_BUFL,
                            iblock * ENH_BLOCKL + startPos,
                            enh_period,
                            WebRtcIlbcfix_kEnhPlocs, ENH_NBLOCKS_TOT);
   }
 
   return (lag);
 }