blob: ec3816fee1a96d8677a250f21fadb4172a6186f5 [file] [log] [blame]
* 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 <atomic>
#include <memory>
#include <string>
#include "modules/audio_processing/agc2/adaptive_digital_gain_controller.h"
#include "modules/audio_processing/agc2/cpu_features.h"
#include "modules/audio_processing/agc2/gain_applier.h"
#include "modules/audio_processing/agc2/limiter.h"
#include "modules/audio_processing/agc2/vad_wrapper.h"
#include "modules/audio_processing/include/audio_processing.h"
#include "modules/audio_processing/logging/apm_data_dumper.h"
namespace webrtc {
class AudioBuffer;
// Gain Controller 2 aims to automatically adjust levels by acting on the
// microphone gain and/or applying digital gain.
class GainController2 {
// Ctor. If `use_internal_vad` is true, an internal voice activity
// detector is used for digital adaptive gain.
GainController2(const AudioProcessing::Config::GainController2& config,
int sample_rate_hz,
int num_channels,
bool use_internal_vad);
GainController2(const GainController2&) = delete;
GainController2& operator=(const GainController2&) = delete;
// Detects and handles changes of sample rate and/or number of channels.
void Initialize(int sample_rate_hz, int num_channels);
// Sets the fixed digital gain.
void SetFixedGainDb(float gain_db);
// Applies fixed and adaptive digital gains to `audio` and runs a limiter.
// If the internal VAD is used, `speech_probability` is ignored. Otherwise
// `speech_probability` is used for digital adaptive gain if it's available
// (limited to values [0.0, 1.0]). Handles input volume changes; if the caller
// cannot determine whether an input volume change occurred, set
// `input_volume_changed` to false.
void Process(absl::optional<float> speech_probability,
bool input_volume_changed,
AudioBuffer* audio);
static bool Validate(const AudioProcessing::Config::GainController2& config);
AvailableCpuFeatures GetCpuFeatures() const { return cpu_features_; }
static std::atomic<int> instance_count_;
const AvailableCpuFeatures cpu_features_;
ApmDataDumper data_dumper_;
GainApplier fixed_gain_applier_;
std::unique_ptr<VoiceActivityDetectorWrapper> vad_;
std::unique_ptr<AdaptiveDigitalGainController> adaptive_digital_controller_;
Limiter limiter_;
int calls_since_last_limiter_log_;
} // namespace webrtc