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* 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
#include "defines.h"
* compute cross correlation between sequences
void WebRtcIlbcfix_MyCorr(
WebRtc_Word32 *corr, /* (o) correlation of seq1 and seq2 */
WebRtc_Word16 *seq1, /* (i) first sequence */
WebRtc_Word16 dim1, /* (i) dimension first seq1 */
const WebRtc_Word16 *seq2, /* (i) second sequence */
WebRtc_Word16 dim2 /* (i) dimension seq2 */
WebRtc_Word16 max, scale, loops;
/* Calculate correlation between the two sequences. Scale the
result of the multiplcication to maximum 26 bits in order
to avoid overflow */
max=WebRtcSpl_MaxAbsValueW16(seq1, dim1);
scale = (WebRtc_Word16)(WEBRTC_SPL_MUL_16_16(2,scale)-26);
if (scale<0) {
/* Calculate the cross correlations */
WebRtcSpl_CrossCorrelation(corr, (WebRtc_Word16*)seq2, seq1, dim2, loops, scale, 1);