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      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 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   size_t i = 0, j = 0;
     22 
     23   for (i = 0; i < dim_cross_correlation; i++) {
     24     int32_t corr = 0;
     25     for (j = 0; j < dim_seq; j++)
     26       corr += (seq1[j] * seq2[j]) >> right_shifts;
     27     seq2 += step_seq2;
     28     *cross_correlation++ = corr;
     29   }
     30 }
     31