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Hypothetical scenario: short weak speech at start of call, then high noise. The digital adaptive AGC2 would pick a high gain, and then continue to apply it on the noise. Unless the noise is detected by the noise estimator, the gain would never be reduced. This CL addresses the issue by sending limiter gain info to the adaptive digital AGC2. Bug: webrtc:7494 Change-Id: Idf5c2686af0f5e5bad981d39a95b8efc9ffb9d64 Reviewed-on: https://webrtc-review.googlesource.com/102641 Reviewed-by: Sam Zackrisson <saza@webrtc.org> Commit-Queue: Alex Loiko <aleloi@webrtc.org> Cr-Commit-Position: refs/heads/master@{#24922}
55 lines
1.9 KiB
C++
55 lines
1.9 KiB
C++
/*
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* Copyright (c) 2018 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_ADAPTIVE_DIGITAL_GAIN_APPLIER_H_
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#define MODULES_AUDIO_PROCESSING_AGC2_ADAPTIVE_DIGITAL_GAIN_APPLIER_H_
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#include "modules/audio_processing/agc2/agc2_common.h"
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#include "modules/audio_processing/agc2/gain_applier.h"
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#include "modules/audio_processing/agc2/vad_with_level.h"
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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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struct SignalWithLevels {
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SignalWithLevels(AudioFrameView<float> float_frame);
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SignalWithLevels(const SignalWithLevels&);
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float input_level_dbfs = -1.f;
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float input_noise_level_dbfs = -1.f;
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VadWithLevel::LevelAndProbability vad_result;
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float limiter_audio_level_dbfs = -1.f;
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bool estimate_is_confident = false;
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AudioFrameView<float> float_frame;
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};
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class AdaptiveDigitalGainApplier {
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public:
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explicit AdaptiveDigitalGainApplier(ApmDataDumper* apm_data_dumper);
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// Decide what gain to apply.
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void Process(SignalWithLevels signal_with_levels);
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private:
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float last_gain_db_ = kInitialAdaptiveDigitalGainDb;
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GainApplier gain_applier_;
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int calls_since_last_gain_log_ = 0;
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// For some combinations of noise and speech probability, increasing
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// the level is not allowed. Since we may get VAD results in bursts,
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// we keep track of this variable until the next VAD results come
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// in.
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bool gain_increase_allowed_ = true;
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ApmDataDumper* apm_data_dumper_ = nullptr;
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};
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} // namespace webrtc
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#endif // MODULES_AUDIO_PROCESSING_AGC2_ADAPTIVE_DIGITAL_GAIN_APPLIER_H_
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