b5c48b97f6
Ongoing fixes and improvements, transient suppressor is gone. Also, dropping isac because it doesn't seem to be useful, and is just build system deadweight now. Upstream references: Version: 131.0.6778.200 WebRTC: 79aff54b0fa9238ce3518dd9eaf9610cd6f22e82 Chromium: 2a19506ad24af755f2a215a4c61f775393e0db42
79 lines
2.9 KiB
C++
79 lines
2.9 KiB
C++
/*
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* Copyright (c) 2018 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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#ifndef MODULES_AUDIO_PROCESSING_AGC2_VAD_WRAPPER_H_
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#define MODULES_AUDIO_PROCESSING_AGC2_VAD_WRAPPER_H_
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#include <memory>
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#include <vector>
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#include "api/audio/audio_view.h"
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#include "common_audio/resampler/include/push_resampler.h"
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#include "modules/audio_processing/agc2/cpu_features.h"
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namespace webrtc {
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// Wraps a single-channel Voice Activity Detector (VAD) which is used to analyze
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// the first channel of the input audio frames. Takes care of resampling the
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// input frames to match the sample rate of the wrapped VAD and periodically
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// resets the VAD.
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class VoiceActivityDetectorWrapper {
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public:
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// Single channel VAD interface.
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class MonoVad {
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public:
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virtual ~MonoVad() = default;
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// Returns the sample rate (Hz) required for the input frames analyzed by
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// `ComputeProbability`.
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virtual int SampleRateHz() const = 0;
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// Resets the internal state.
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virtual void Reset() = 0;
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// Analyzes an audio frame and returns the speech probability.
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virtual float Analyze(MonoView<const float> frame) = 0;
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};
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// Ctor. Uses `cpu_features` to instantiate the default VAD.
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VoiceActivityDetectorWrapper(const AvailableCpuFeatures& cpu_features,
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int sample_rate_hz);
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// Ctor. `vad_reset_period_ms` indicates the period in milliseconds to call
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// `MonoVad::Reset()`; it must be equal to or greater than the duration of two
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// frames. Uses `cpu_features` to instantiate the default VAD.
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VoiceActivityDetectorWrapper(int vad_reset_period_ms,
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const AvailableCpuFeatures& cpu_features,
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int sample_rate_hz);
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// Ctor. Uses a custom `vad`.
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VoiceActivityDetectorWrapper(int vad_reset_period_ms,
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std::unique_ptr<MonoVad> vad,
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int sample_rate_hz);
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VoiceActivityDetectorWrapper(const VoiceActivityDetectorWrapper&) = delete;
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VoiceActivityDetectorWrapper& operator=(const VoiceActivityDetectorWrapper&) =
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delete;
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~VoiceActivityDetectorWrapper();
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// Analyzes the first channel of `frame` and returns the speech probability.
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// `frame` must be a 10 ms frame with the sample rate specified in the last
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// `Initialize()` call.
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float Analyze(DeinterleavedView<const float> frame);
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private:
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const int vad_reset_period_frames_;
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const int frame_size_;
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int time_to_vad_reset_;
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std::unique_ptr<MonoVad> vad_;
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std::vector<float> resampled_buffer_;
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PushResampler<float> resampler_;
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};
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} // namespace webrtc
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#endif // MODULES_AUDIO_PROCESSING_AGC2_VAD_WRAPPER_H_
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