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/*
* Copyright (c) 2016 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 WEBRTC_MODULES_AUDIO_PROCESSING_LEVEL_CONTROLLER_LEVEL_CONTROLLER_H_
#define WEBRTC_MODULES_AUDIO_PROCESSING_LEVEL_CONTROLLER_LEVEL_CONTROLLER_H_
#include <memory>
#include <vector>
#include "webrtc/base/constructormagic.h"
#include "webrtc/base/optional.h"
#include "webrtc/modules/audio_processing/include/audio_processing.h"
#include "webrtc/modules/audio_processing/level_controller/gain_applier.h"
#include "webrtc/modules/audio_processing/level_controller/gain_selector.h"
#include "webrtc/modules/audio_processing/level_controller/noise_level_estimator.h"
#include "webrtc/modules/audio_processing/level_controller/peak_level_estimator.h"
#include "webrtc/modules/audio_processing/level_controller/saturating_gain_estimator.h"
#include "webrtc/modules/audio_processing/level_controller/signal_classifier.h"
namespace webrtc {
class ApmDataDumper;
class AudioBuffer;
class LevelController {
public:
LevelController();
~LevelController();
void Initialize(int sample_rate_hz);
void Process(AudioBuffer* audio);
float GetLastGain() { return last_gain_; }
// TODO(peah): This method is a temporary solution as the the aim is to
// instead apply the config inside the constructor. Therefore this is likely
// to change.
void ApplyConfig(const AudioProcessing::Config::LevelController& config);
// Validates a config.
static bool Validate(const AudioProcessing::Config::LevelController& config);
// Dumps a config to a string.
static std::string ToString(
const AudioProcessing::Config::LevelController& config);
private:
class Metrics {
public:
Metrics() { Initialize(AudioProcessing::kSampleRate48kHz); }
void Initialize(int sample_rate_hz);
void Update(float long_term_peak_level,
float noise_level,
float gain,
float frame_peak_level);
private:
void Reset();
size_t metrics_frame_counter_;
float gain_sum_;
float peak_level_sum_;
float noise_energy_sum_;
float max_gain_;
float max_peak_level_;
float max_noise_energy_;
float frame_length_;
};
std::unique_ptr<ApmDataDumper> data_dumper_;
GainSelector gain_selector_;
GainApplier gain_applier_;
SignalClassifier signal_classifier_;
NoiseLevelEstimator noise_level_estimator_;
PeakLevelEstimator peak_level_estimator_;
SaturatingGainEstimator saturating_gain_estimator_;
Metrics metrics_;
rtc::Optional<int> sample_rate_hz_;
static int instance_count_;
float dc_level_[2];
float dc_forgetting_factor_;
float last_gain_;
bool gain_jumpstart_ = false;
AudioProcessing::Config::LevelController config_;
RTC_DISALLOW_COPY_AND_ASSIGN(LevelController);
};
} // namespace webrtc
#endif // WEBRTC_MODULES_AUDIO_PROCESSING_LEVEL_CONTROLLER_LEVEL_CONTROLLER_H_
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