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. */
WebRtcSpl_CrossCorrelationC(int32_t * cross_correlation,const int16_t * seq1,const int16_t * seq2,size_t dim_seq,size_t dim_cross_correlation,int right_shifts,int step_seq2)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