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Reland "Refactoring of the noise suppressor and adding true multichannel support"

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This is a reland of 87a7b82520b83a6cf42da27cdc46142c2eb6248c

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}
This commit is contained in:
Per Åhgren
2019-10-29 22:59:44 +01:00
committed by Commit Bot
parent 159b417c98
commit 0cbb58e046
61 changed files with 4019 additions and 1440 deletions
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38
modules/audio_processing/ns/fast_math.h Normal file
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/*
* Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef MODULES_AUDIO_PROCESSING_NS_FAST_MATH_H_
#define MODULES_AUDIO_PROCESSING_NS_FAST_MATH_H_
#include "api/array_view.h"
namespace webrtc {
// Sqrt approximation.
float SqrtFastApproximation(float f);
// Log base conversion log(x) = log2(x)/log2(e).
float LogApproximation(float x);
void LogApproximation(rtc::ArrayView<const float> x, rtc::ArrayView<float> y);
// 2^x approximation.
float Pow2Approximation(float p);
// x^p approximation.
float PowApproximation(float x, float p);
// e^x approximation.
float ExpApproximation(float x);
void ExpApproximation(rtc::ArrayView<const float> x, rtc::ArrayView<float> y);
void ExpApproximationSignFlip(rtc::ArrayView<const float> x,
rtc::ArrayView<float> y);
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_NS_FAST_MATH_H_