56 lines
1.5 KiB
C
56 lines
1.5 KiB
C
/*
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* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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/*
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* Calculate best overlap fit according to distortion measure.
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*/
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#include "dsp_helpfunctions.h"
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#include "signal_processing_library.h"
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WebRtc_Word16 WebRtcNetEQ_MinDistortion(const WebRtc_Word16 *pw16_data,
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WebRtc_Word16 w16_minLag, WebRtc_Word16 w16_maxLag,
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WebRtc_Word16 len, WebRtc_Word32 *pw16_dist)
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{
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int i, j;
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const WebRtc_Word16 *pw16_data1;
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const WebRtc_Word16 *pw16_data2;
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WebRtc_Word32 w32_diff;
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WebRtc_Word32 w32_sumdiff;
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WebRtc_Word16 bestIndex = -1;
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WebRtc_Word32 minDist = WEBRTC_SPL_WORD32_MAX;
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for (i = w16_minLag; i <= w16_maxLag; i++)
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{
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w32_sumdiff = 0;
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pw16_data1 = pw16_data;
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pw16_data2 = pw16_data - i;
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for (j = 0; j < len; j++)
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{
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w32_diff = pw16_data1[j] - pw16_data2[j];
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w32_sumdiff += WEBRTC_SPL_ABS_W32(w32_diff);
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}
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/* Compare with previous minimum */
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if (w32_sumdiff < minDist)
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{
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minDist = w32_sumdiff;
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bestIndex = i;
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}
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}
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*pw16_dist = minDist;
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return bestIndex;
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}
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