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/*
* Copyright (c) 2017 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.
*/
#include "modules/audio_processing/gain_controller2.h"
#include "common_audio/include/audio_util.h"
#include "modules/audio_processing/audio_buffer.h"
#include "modules/audio_processing/include/audio_frame_view.h"
#include "modules/audio_processing/logging/apm_data_dumper.h"
#include "rtc_base/atomic_ops.h"
#include "rtc_base/checks.h"
#include "rtc_base/strings/string_builder.h"
namespace webrtc {
int GainController2::instance_count_ = 0;
GainController2::GainController2()
: data_dumper_(
new ApmDataDumper(rtc::AtomicOps::Increment(&instance_count_))),
gain_applier_(/*hard_clip_samples=*/false,
/*initial_gain_factor=*/0.f),
limiter_(static_cast<size_t>(48000), data_dumper_.get(), "Agc2") {
if (config_.adaptive_digital.enabled) {
adaptive_agc_.reset(new AdaptiveAgc(data_dumper_.get()));
}
}
GainController2::~GainController2() = default;
void GainController2::Initialize(int sample_rate_hz) {
RTC_DCHECK(sample_rate_hz == AudioProcessing::kSampleRate8kHz ||
sample_rate_hz == AudioProcessing::kSampleRate16kHz ||
sample_rate_hz == AudioProcessing::kSampleRate32kHz ||
sample_rate_hz == AudioProcessing::kSampleRate48kHz);
limiter_.SetSampleRate(sample_rate_hz);
data_dumper_->InitiateNewSetOfRecordings();
data_dumper_->DumpRaw("sample_rate_hz", sample_rate_hz);
}
void GainController2::Process(AudioBuffer* audio) {
AudioFrameView<float> float_frame(audio->channels(), audio->num_channels(),
audio->num_frames());
// Apply fixed gain first, then the adaptive one.
gain_applier_.ApplyGain(float_frame);
if (adaptive_agc_) {
adaptive_agc_->Process(float_frame, limiter_.LastAudioLevel());
}
limiter_.Process(float_frame);
}
void GainController2::NotifyAnalogLevel(int level) {
if (analog_level_ != level && adaptive_agc_) {
adaptive_agc_->Reset();
}
analog_level_ = level;
}
void GainController2::ApplyConfig(
const AudioProcessing::Config::GainController2& config) {
RTC_DCHECK(Validate(config))
<< " the invalid config was " << ToString(config);
config_ = config;
if (config.fixed_digital.gain_db != config_.fixed_digital.gain_db) {
// Reset the limiter to quickly react on abrupt level changes caused by
// large changes of the fixed gain.
limiter_.Reset();
}
gain_applier_.SetGainFactor(DbToRatio(config_.fixed_digital.gain_db));
if (config_.adaptive_digital.enabled) {
adaptive_agc_.reset(new AdaptiveAgc(data_dumper_.get(), config_));
} else {
adaptive_agc_.reset();
}
}
bool GainController2::Validate(
const AudioProcessing::Config::GainController2& config) {
return config.fixed_digital.gain_db >= 0.f &&
config.fixed_digital.gain_db < 50.f &&
config.adaptive_digital.extra_saturation_margin_db >= 0.f &&
config.adaptive_digital.extra_saturation_margin_db <= 100.f;
}
std::string GainController2::ToString(
const AudioProcessing::Config::GainController2& config) {
rtc::StringBuilder ss;
std::string adaptive_digital_level_estimator;
using LevelEstimatorType =
AudioProcessing::Config::GainController2::LevelEstimator;
switch (config.adaptive_digital.level_estimator) {
case LevelEstimatorType::kRms:
adaptive_digital_level_estimator = "RMS";
break;
case LevelEstimatorType::kPeak:
adaptive_digital_level_estimator = "peak";
break;
}
// clang-format off
// clang formatting doesn't respect custom nested style.
ss << "{"
"enabled: " << (config.enabled ? "true" : "false") << ", "
"fixed_digital: {gain_db: " << config.fixed_digital.gain_db << "}, "
"adaptive_digital: {"
"enabled: "
<< (config.adaptive_digital.enabled ? "true" : "false") << ", "
"level_estimator: {"
"type: " << adaptive_digital_level_estimator << ", "
"adjacent_speech_frames_threshold: "
<< config.adaptive_digital
.level_estimator_adjacent_speech_frames_threshold << ", "
"initial_saturation_margin_db: "
<< config.adaptive_digital.initial_saturation_margin_db << ", "
"extra_saturation_margin_db: "
<< config.adaptive_digital.extra_saturation_margin_db << "}, "
"gain_applier: {"
"adjacent_speech_frames_threshold: "
<< config.adaptive_digital
.gain_applier_adjacent_speech_frames_threshold << ", "
"max_gain_change_db_per_second: "
<< config.adaptive_digital.max_gain_change_db_per_second << ", "
"max_output_noise_level_dbfs: "
<< config.adaptive_digital.max_output_noise_level_dbfs << "}"
"}"
"}";
// clang-format on
return ss.Release();
}
} // namespace webrtc
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