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/*
* Copyright (c) 2018 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 MODULES_AUDIO_PROCESSING_AGC2_VAD_WITH_LEVEL_H_
#define MODULES_AUDIO_PROCESSING_AGC2_VAD_WITH_LEVEL_H_
#include <memory>
#include "modules/audio_processing/agc2/cpu_features.h"
#include "modules/audio_processing/include/audio_frame_view.h"
namespace webrtc {
// Class to analyze voice activity and audio levels.
class VadLevelAnalyzer {
public:
struct Result {
float speech_probability; // Range: [0, 1].
float rms_dbfs; // Root mean square power (dBFS).
float peak_dbfs; // Peak power (dBFS).
};
// Voice Activity Detector (VAD) interface.
class VoiceActivityDetector {
public:
virtual ~VoiceActivityDetector() = default;
// Resets the internal state.
virtual void Reset() = 0;
// Analyzes an audio frame and returns the speech probability.
virtual float ComputeProbability(AudioFrameView<const float> frame) = 0;
};
// Ctor. Uses the default VAD with the default settings.
VadLevelAnalyzer();
// Ctor. `vad_reset_period_ms` indicates the period in milliseconds to call
// `VadLevelAnalyzer::Reset()`; it must be equal to or greater than the
// duration of two frames. Uses `cpu_features` to instantiate the default VAD.
VadLevelAnalyzer(int vad_reset_period_ms,
const AvailableCpuFeatures& cpu_features);
// Ctor. Uses a custom `vad`.
VadLevelAnalyzer(int vad_reset_period_ms,
std::unique_ptr<VoiceActivityDetector> vad);
VadLevelAnalyzer(const VadLevelAnalyzer&) = delete;
VadLevelAnalyzer& operator=(const VadLevelAnalyzer&) = delete;
~VadLevelAnalyzer();
// Computes the speech probability and the level for `frame`.
Result AnalyzeFrame(AudioFrameView<const float> frame);
private:
std::unique_ptr<VoiceActivityDetector> vad_;
const int vad_reset_period_frames_;
int time_to_vad_reset_;
};
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_AGC2_VAD_WITH_LEVEL_H_
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