cf808d2366
This change instroduces a mode where the Accelerate operation will be more aggressive. When enabled, it will allow acceleration at lower correlation levels, and possibly remove multiple pitch periods at once. The feature is enabled through NetEq::Config, and is off by default. This means that bit-exactness tests are currently not affected. A unit test was added for the Accelerate class, with and without fast mode enabled. BUG=4691 R=minyue@webrtc.org Review URL: https://webrtc-codereview.appspot.com/50039004 Cr-Commit-Position: refs/heads/master@{#9295}
82 lines
3.3 KiB
C++
82 lines
3.3 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_CODING_NETEQ_ACCELERATE_H_
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#define WEBRTC_MODULES_AUDIO_CODING_NETEQ_ACCELERATE_H_
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#include <assert.h>
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#include "webrtc/base/constructormagic.h"
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#include "webrtc/modules/audio_coding/neteq/audio_multi_vector.h"
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#include "webrtc/modules/audio_coding/neteq/time_stretch.h"
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#include "webrtc/typedefs.h"
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namespace webrtc {
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// Forward declarations.
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class BackgroundNoise;
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// This class implements the Accelerate operation. Most of the work is done
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// in the base class TimeStretch, which is shared with the PreemptiveExpand
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// operation. In the Accelerate class, the operations that are specific to
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// Accelerate are implemented.
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class Accelerate : public TimeStretch {
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public:
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Accelerate(int sample_rate_hz, size_t num_channels,
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const BackgroundNoise& background_noise)
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: TimeStretch(sample_rate_hz, num_channels, background_noise) {
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}
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// This method performs the actual Accelerate operation. The samples are
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// read from |input|, of length |input_length| elements, and are written to
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// |output|. The number of samples removed through time-stretching is
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// is provided in the output |length_change_samples|. The method returns
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// the outcome of the operation as an enumerator value. If |fast_accelerate|
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// is true, the algorithm will relax the requirements on finding strong
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// correlations, and may remove multiple pitch periods if possible.
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ReturnCodes Process(const int16_t* input,
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size_t input_length,
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bool fast_accelerate,
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AudioMultiVector* output,
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int16_t* length_change_samples);
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protected:
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// Sets the parameters |best_correlation| and |peak_index| to suitable
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// values when the signal contains no active speech.
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void SetParametersForPassiveSpeech(size_t len,
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int16_t* best_correlation,
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int* peak_index) const override;
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// Checks the criteria for performing the time-stretching operation and,
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// if possible, performs the time-stretching.
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ReturnCodes CheckCriteriaAndStretch(const int16_t* input,
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size_t input_length,
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size_t peak_index,
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int16_t best_correlation,
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bool active_speech,
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bool fast_mode,
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AudioMultiVector* output) const override;
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private:
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DISALLOW_COPY_AND_ASSIGN(Accelerate);
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};
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struct AccelerateFactory {
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AccelerateFactory() {}
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virtual ~AccelerateFactory() {}
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virtual Accelerate* Create(int sample_rate_hz,
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size_t num_channels,
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const BackgroundNoise& background_noise) const;
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};
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} // namespace webrtc
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#endif // WEBRTC_MODULES_AUDIO_CODING_NETEQ_ACCELERATE_H_
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