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604fd2f1ab
Bug: webrtc:13555, webrtc:13082 Change-Id: I2c2cbcbd918f0cfa970c1a964893220ba11d4b41 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/247960 Reviewed-by: Artem Titov <titovartem@webrtc.org> Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: (Daniel.L) Byoungchan Lee <daniel.l@hpcnt.com> Cr-Commit-Position: refs/heads/main@{#35771}
79 lines
3.2 KiB
C++
79 lines
3.2 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 MODULES_AUDIO_CODING_NETEQ_ACCELERATE_H_
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#define MODULES_AUDIO_CODING_NETEQ_ACCELERATE_H_
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#include <stddef.h>
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#include <stdint.h>
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#include "modules/audio_coding/neteq/time_stretch.h"
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namespace webrtc {
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class AudioMultiVector;
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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,
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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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Accelerate(const Accelerate&) = delete;
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Accelerate& operator=(const Accelerate&) = delete;
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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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size_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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size_t* 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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};
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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 // MODULES_AUDIO_CODING_NETEQ_ACCELERATE_H_
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