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52f8188f5d
This reverts commit 6f37ed78d9.
Reason for revert: <INSERT REASONING HERE>
Original change's description:
> Deprecate the adaptive level controller
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> Level control handled by default-on AGC.
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> Bug: none
> Change-Id: I405daeceece12c896d41156b649fcfd556726f77
> Reviewed-on: https://webrtc-review.googlesource.com/59682
> Reviewed-by: Fredrik Solenberg <solenberg@webrtc.org>
> Reviewed-by: Alex Loiko <aleloi@webrtc.org>
> Commit-Queue: Sam Zackrisson <saza@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#22305}
TBR=solenberg@webrtc.org,saza@webrtc.org,aleloi@webrtc.org
Change-Id: Ic52f41fcbebfd2291a51b17ac788313e1ceef163
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: none
Reviewed-on: https://webrtc-review.googlesource.com/60240
Reviewed-by: Sam Zackrisson <saza@webrtc.org>
Commit-Queue: Sam Zackrisson <saza@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22308}
72 lines
2.4 KiB
C++
72 lines
2.4 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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#include "modules/audio_processing/level_controller/noise_level_estimator.h"
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#include <algorithm>
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#include "modules/audio_processing/audio_buffer.h"
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#include "modules/audio_processing/logging/apm_data_dumper.h"
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namespace webrtc {
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NoiseLevelEstimator::NoiseLevelEstimator() {
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Initialize(AudioProcessing::kSampleRate48kHz);
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}
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NoiseLevelEstimator::~NoiseLevelEstimator() {}
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void NoiseLevelEstimator::Initialize(int sample_rate_hz) {
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noise_energy_ = 1.f;
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first_update_ = true;
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min_noise_energy_ = sample_rate_hz * 2.f * 2.f / 100.f;
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noise_energy_hold_counter_ = 0;
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}
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float NoiseLevelEstimator::Analyze(SignalClassifier::SignalType signal_type,
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float frame_energy) {
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if (frame_energy <= 0.f) {
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return noise_energy_;
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}
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if (first_update_) {
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// Initialize the noise energy to the frame energy.
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first_update_ = false;
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return noise_energy_ = std::max(frame_energy, min_noise_energy_);
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}
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// Update the noise estimate in a minimum statistics-type manner.
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if (signal_type == SignalClassifier::SignalType::kStationary) {
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if (frame_energy > noise_energy_) {
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// Leak the estimate upwards towards the frame energy if no recent
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// downward update.
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noise_energy_hold_counter_ = std::max(noise_energy_hold_counter_ - 1, 0);
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if (noise_energy_hold_counter_ == 0) {
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noise_energy_ = std::min(noise_energy_ * 1.01f, frame_energy);
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}
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} else {
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// Update smoothly downwards with a limited maximum update magnitude.
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noise_energy_ =
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std::max(noise_energy_ * 0.9f,
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noise_energy_ + 0.05f * (frame_energy - noise_energy_));
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noise_energy_hold_counter_ = 1000;
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}
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} else {
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// For a non-stationary signal, leak the estimate downwards in order to
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// avoid estimate locking due to incorrect signal classification.
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noise_energy_ = noise_energy_ * 0.99f;
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}
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// Ensure a minimum of the estimate.
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return noise_energy_ = std::max(noise_energy_, min_noise_energy_);
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}
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} // namespace webrtc
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