1760a17b8e
Re-land: http://review.webrtc.org/2151007/ TBR=bjornv@webrtc.org Original change description: This mode extends the filter length from the current 48 ms to 128 ms. It is runtime selectable which allows it to be enabled through experiment. We reuse the DelayCorrection infrastructure to avoid having to replumb everything up to libjingle. Increases AEC complexity by ~50% on modern x86 CPUs. Measurements (in percent of usage on one core): Machine/CPU Normal Extended MacBook Retina (Early 2013), Core i7 Ivy Bridge (2.7 GHz, hyperthreaded) 0.6% 0.9% MacBook Air (Late 2010), Core 2 Duo (2.13 GHz) 1.4% 2.7% Chromebook Pixel, Core i5 Ivy Bridge (1.8 GHz) 0.6% 1.0% Samsung ARM Chromebook, Samsung Exynos 5 Dual (1.7 GHz) 3.2% 5.6% The relative value is large of course but the absolute should be acceptable in order to have a working AEC on some platforms. Detailed changes to the algorithm: - The filter length is changed from 48 to 128 ms. This comes with tuning of several parameters: i) filter adaptation stepsize and error threshold; ii) non-linear processing smoothing and overdrive. - Option to ignore the reported delays on platforms which we deem sufficiently unreliable. Currently this will be enabled in Chromium for Mac. - Faster startup times by removing the excessive "startup phase" processing of reported delays. - Much more conservative adjustments to the far-end read pointer. We smooth the delay difference more heavily, and back off from the difference more. Adjustments force a readaptation of the filter, so they should be avoided except when really necessary. Corresponds to these changes: https://chromereviews.googleplex.com/9412014 https://chromereviews.googleplex.com/9514013 https://chromereviews.googleplex.com/9960013 BUG=454,827,1261 Review URL: https://webrtc-codereview.appspot.com/2295006 git-svn-id: http://webrtc.googlecode.com/svn/trunk@4848 4adac7df-926f-26a2-2b94-8c16560cd09d
69 lines
1.8 KiB
C
69 lines
1.8 KiB
C
/*
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* Copyright (c) 2012 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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#ifndef WEBRTC_MODULES_AUDIO_PROCESSING_AEC_ECHO_CANCELLATION_INTERNAL_H_
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#define WEBRTC_MODULES_AUDIO_PROCESSING_AEC_ECHO_CANCELLATION_INTERNAL_H_
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#include "webrtc/modules/audio_processing/aec/aec_core.h"
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#include "webrtc/modules/audio_processing/utility/ring_buffer.h"
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typedef struct {
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int delayCtr;
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int sampFreq;
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int splitSampFreq;
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int scSampFreq;
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float sampFactor; // scSampRate / sampFreq
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short skewMode;
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int bufSizeStart;
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int knownDelay;
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int rate_factor;
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short initFlag; // indicates if AEC has been initialized
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// Variables used for averaging far end buffer size
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short counter;
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int sum;
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short firstVal;
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short checkBufSizeCtr;
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// Variables used for delay shifts
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short msInSndCardBuf;
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short filtDelay; // Filtered delay estimate.
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int timeForDelayChange;
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int startup_phase;
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int checkBuffSize;
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short lastDelayDiff;
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#ifdef WEBRTC_AEC_DEBUG_DUMP
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RingBuffer* far_pre_buf_s16; // Time domain far-end pre-buffer in int16_t.
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FILE* bufFile;
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FILE* delayFile;
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FILE* skewFile;
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#endif
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// Structures
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void* resampler;
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int skewFrCtr;
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int resample; // if the skew is small enough we don't resample
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int highSkewCtr;
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float skew;
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RingBuffer* far_pre_buf; // Time domain far-end pre-buffer.
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int lastError;
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int farend_started;
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AecCore* aec;
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} aecpc_t;
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#endif // WEBRTC_MODULES_AUDIO_PROCESSING_AEC_ECHO_CANCELLATION_INTERNAL_H_
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