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The current noise level estimator has a bug due to which the estimated level decays to the lower bound in a few seconds when speech is observed. Instead of fixing the current implementation, which is based on a stationarity classifier, an alternative, lightweight, noise floor estimator has been added and tuned for AGC2. Tested on several AEC dumps including HW mute, music and fast talking. Bug: webrtc:7494 Change-Id: Iae4cff9fc955a716878f830957e893cd5bc59446 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/214133 Commit-Queue: Alessio Bazzica <alessiob@webrtc.org> Reviewed-by: Per Åhgren <peah@webrtc.org> Cr-Commit-Position: refs/heads/master@{#33733}
40 lines
1.4 KiB
C++
40 lines
1.4 KiB
C++
/*
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* Copyright (c) 2016 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_AGC2_NOISE_LEVEL_ESTIMATOR_H_
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#define MODULES_AUDIO_PROCESSING_AGC2_NOISE_LEVEL_ESTIMATOR_H_
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#include <memory>
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#include "modules/audio_processing/include/audio_frame_view.h"
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namespace webrtc {
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class ApmDataDumper;
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// Noise level estimator interface.
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class NoiseLevelEstimator {
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public:
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virtual ~NoiseLevelEstimator() = default;
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// Analyzes a 10 ms `frame`, updates the noise level estimation and returns
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// the value for the latter in dBFS.
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virtual float Analyze(const AudioFrameView<const float>& frame) = 0;
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};
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// Creates a noise level estimator based on stationarity detection.
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std::unique_ptr<NoiseLevelEstimator> CreateStationaryNoiseEstimator(
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ApmDataDumper* data_dumper);
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// Creates a noise level estimator based on noise floor detection.
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std::unique_ptr<NoiseLevelEstimator> CreateNoiseFloorEstimator(
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ApmDataDumper* data_dumper);
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} // namespace webrtc
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#endif // MODULES_AUDIO_PROCESSING_AGC2_NOISE_LEVEL_ESTIMATOR_H_
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