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0cbb58e046
This is a reland of 87a7b82520
Original change's description:
> Refactoring of the noise suppressor and adding true multichannel support
>
> This CL adds proper multichannel support to the noise suppressor.
> To accomplish that in a safe way, a full refactoring of the noise
> suppressor code has been done.
>
> Due to floating point precision, the changes made are not entirely
> bitexact. They are, however, very close to being bitexact.
>
> As a safety measure, the former noise suppressor code is preserved
> and a kill-switch is added to allow revering to the legacy noise
> suppressor in case issues arise.
>
> Bug: webrtc:10895, b/143344262
> Change-Id: I0b071011b23265ac12e6d4b3956499d122286657
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/158407
> Commit-Queue: Per Åhgren <peah@webrtc.org>
> Reviewed-by: Gustaf Ullberg <gustaf@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#29646}
Bug: webrtc:10895, b/143344262
Change-Id: I236f1e67bb0baa4e30908a4cf7a8a7bb55fbced3
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/158747
Reviewed-by: Gustaf Ullberg <gustaf@webrtc.org>
Commit-Queue: Per Åhgren <peah@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29663}
57 lines
1.9 KiB
C++
57 lines
1.9 KiB
C++
/*
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* Copyright (c) 2019 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_PROCESSING_LEGACY_NOISE_SUPPRESSION_H_
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#define MODULES_AUDIO_PROCESSING_LEGACY_NOISE_SUPPRESSION_H_
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#include <memory>
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#include <vector>
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namespace webrtc {
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class AudioBuffer;
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// The noise suppression (NS) component attempts to remove noise while
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// retaining speech. Recommended to be enabled on the client-side.
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class NoiseSuppression {
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public:
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// Determines the aggressiveness of the suppression. Increasing the level
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// will reduce the noise level at the expense of a higher speech distortion.
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enum class Level { kLow, kModerate, kHigh, kVeryHigh };
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NoiseSuppression(size_t channels, int sample_rate_hz, Level level);
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~NoiseSuppression();
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NoiseSuppression(NoiseSuppression&) = delete;
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NoiseSuppression& operator=(NoiseSuppression&) = delete;
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void AnalyzeCaptureAudio(AudioBuffer* audio);
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void ProcessCaptureAudio(AudioBuffer* audio);
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// LEGACY: Returns the internally computed prior speech probability of current
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// frame averaged over output channels. This is not supported in fixed point,
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// for which |kUnsupportedFunctionError| is returned.
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float speech_probability() const;
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// LEGACY: Returns the size of the noise vector returned by NoiseEstimate().
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static size_t num_noise_bins();
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// LEGACY: Returns the noise estimate per frequency bin averaged over all
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// channels.
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std::vector<float> NoiseEstimate();
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private:
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class Suppressor;
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std::vector<std::unique_ptr<Suppressor>> suppressors_;
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};
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} // namespace webrtc
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#endif // MODULES_AUDIO_PROCESSING_LEGACY_NOISE_SUPPRESSION_H_
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