text: /*
   *  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_InterpolateSamples.c
  
  ******************************************************************/
  
  #include "modules/audio_coding/codecs/ilbc/defines.h"
  #include "modules/audio_coding/codecs/ilbc/constants.h"
  
  void WebRtcIlbcfix_InterpolateSamples(
      int16_t *interpSamples, /* (o) The interpolated samples */
      int16_t *CBmem,   /* (i) The CB memory */
      size_t lMem    /* (i) Length of the CB memory */
                                        ) {
    int16_t *ppi, *ppo, i, j, temp1, temp2;
    int16_t *tmpPtr;
  
    /* Calculate the 20 vectors of interpolated samples (4 samples each)
       that are used in the codebooks for lag 20 to 39 */
    tmpPtr = interpSamples;
    for (j=0; j<20; j++) {
      temp1 = 0;
      temp2 = 3;
      ppo = CBmem+lMem-4;
      ppi = CBmem+lMem-j-24;
      for (i=0; i<4; i++) {
  
        *tmpPtr++ = (int16_t)((WebRtcIlbcfix_kAlpha[temp2] * *ppo) >> 15) +
            (int16_t)((WebRtcIlbcfix_kAlpha[temp1] * *ppi) >> 15);
  
        ppo++;
        ppi++;
        temp1++;
        temp2--;
      }
    }
  
    return;
  }
  