Line data    Source code

       1             : /*
       2             :  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
       3             :  *
       4             :  *  Use of this source code is governed by a BSD-style license
       5             :  *  that can be found in the LICENSE file in the root of the source
       6             :  *  tree. An additional intellectual property rights grant can be found
       7             :  *  in the file PATENTS.  All contributing project authors may
       8             :  *  be found in the AUTHORS file in the root of the source tree.
       9             :  */
      10             : 
      11             : #include "webrtc/common_audio/signal_processing/include/signal_processing_library.h"
      12             : 
      13             : /* C version of WebRtcSpl_CrossCorrelation() for generic platforms. */
      14           0 : void WebRtcSpl_CrossCorrelationC(int32_t* cross_correlation,
      15             :                                  const int16_t* seq1,
      16             :                                  const int16_t* seq2,
      17             :                                  size_t dim_seq,
      18             :                                  size_t dim_cross_correlation,
      19             :                                  int right_shifts,
      20             :                                  int step_seq2) {
      21           0 :   size_t i = 0, j = 0;
      22             : 
      23           0 :   for (i = 0; i < dim_cross_correlation; i++) {
      24           0 :     int32_t corr = 0;
      25           0 :     for (j = 0; j < dim_seq; j++)
      26           0 :       corr += (seq1[j] * seq2[j]) >> right_shifts;
      27           0 :     seq2 += step_seq2;
      28           0 :     *cross_correlation++ = corr;
      29             :   }
      30           0 : }