93 lines
2.9 KiB
C++
93 lines
2.9 KiB
C++
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/*
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* Copyright (c) 2019 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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#include "modules/audio_processing/voice_detection.h"
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#include "common_audio/vad/include/webrtc_vad.h"
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#include "modules/audio_processing/audio_buffer.h"
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#include "rtc_base/checks.h"
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namespace webrtc {
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class VoiceDetection::Vad {
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public:
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Vad() {
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state_ = WebRtcVad_Create();
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RTC_CHECK(state_);
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int error = WebRtcVad_Init(state_);
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RTC_DCHECK_EQ(0, error);
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}
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~Vad() { WebRtcVad_Free(state_); }
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Vad(Vad&) = delete;
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Vad& operator=(Vad&) = delete;
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VadInst* state() { return state_; }
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private:
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VadInst* state_ = nullptr;
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};
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VoiceDetection::VoiceDetection(int sample_rate_hz, Likelihood likelihood)
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: sample_rate_hz_(sample_rate_hz),
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frame_size_samples_(static_cast<size_t>(sample_rate_hz_ / 100)),
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likelihood_(likelihood),
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vad_(new Vad()) {
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int mode = 2;
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switch (likelihood) {
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case VoiceDetection::kVeryLowLikelihood:
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mode = 3;
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break;
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case VoiceDetection::kLowLikelihood:
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mode = 2;
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break;
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case VoiceDetection::kModerateLikelihood:
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mode = 1;
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break;
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case VoiceDetection::kHighLikelihood:
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mode = 0;
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break;
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default:
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RTC_NOTREACHED();
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break;
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}
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int error = WebRtcVad_set_mode(vad_->state(), mode);
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RTC_DCHECK_EQ(0, error);
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}
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VoiceDetection::~VoiceDetection() {}
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bool VoiceDetection::ProcessCaptureAudio(AudioBuffer* audio) {
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RTC_DCHECK_GE(AudioBuffer::kMaxSplitFrameLength,
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audio->num_frames_per_band());
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std::array<int16_t, AudioBuffer::kMaxSplitFrameLength> mixed_low_pass_data;
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rtc::ArrayView<const int16_t> mixed_low_pass(mixed_low_pass_data.data(),
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audio->num_frames_per_band());
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if (audio->num_channels() == 1) {
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FloatS16ToS16(audio->split_bands_const(0)[kBand0To8kHz],
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audio->num_frames_per_band(), mixed_low_pass_data.data());
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} else {
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const int num_channels = static_cast<int>(audio->num_channels());
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for (size_t i = 0; i < audio->num_frames_per_band(); ++i) {
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int32_t value =
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FloatS16ToS16(audio->split_channels_const(kBand0To8kHz)[0][i]);
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for (int j = 1; j < num_channels; ++j) {
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value += FloatS16ToS16(audio->split_channels_const(kBand0To8kHz)[j][i]);
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}
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mixed_low_pass_data[i] = value / num_channels;
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}
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}
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int vad_ret = WebRtcVad_Process(vad_->state(), sample_rate_hz_,
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mixed_low_pass.data(), frame_size_samples_);
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RTC_DCHECK(vad_ret == 0 || vad_ret == 1);
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return vad_ret == 0 ? false : true;
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}
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} // namespace webrtc
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