5d3e6805f2
From the new header file: * MonoView<>: A single channel contiguous buffer of samples. * InterleavedView<>: Channel samples are interleaved (side-by-side) in the buffer. A single channel InterleavedView<> is the same thing as a MonoView<> * DeinterleavedView<>: Each channel's samples are contiguous within the buffer. Channels can be enumerated and accessing the individual channel data is done via MonoView<>. There are also a few utility functions that offer a unified way to check the properties regardless of what view type is in use. Bug: chromium:335805780 Change-Id: I28196f8f4ded4fadc72ee32b62af304c62f4fc47 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/349300 Reviewed-by: Per Åhgren <peah@webrtc.org> Commit-Queue: Tomas Gunnarsson <tommi@webrtc.org> Cr-Commit-Position: refs/heads/main@{#42377}
122 lines
4.4 KiB
C++
122 lines
4.4 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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#include "modules/audio_processing/agc2/vad_wrapper.h"
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#include <array>
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#include <utility>
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#include "api/array_view.h"
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#include "common_audio/resampler/include/push_resampler.h"
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#include "modules/audio_processing/agc2/agc2_common.h"
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#include "modules/audio_processing/agc2/rnn_vad/common.h"
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#include "modules/audio_processing/agc2/rnn_vad/features_extraction.h"
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#include "modules/audio_processing/agc2/rnn_vad/rnn.h"
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#include "rtc_base/checks.h"
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namespace webrtc {
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namespace {
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constexpr int kNumFramesPerSecond = 100;
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class MonoVadImpl : public VoiceActivityDetectorWrapper::MonoVad {
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public:
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explicit MonoVadImpl(const AvailableCpuFeatures& cpu_features)
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: features_extractor_(cpu_features), rnn_vad_(cpu_features) {}
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MonoVadImpl(const MonoVadImpl&) = delete;
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MonoVadImpl& operator=(const MonoVadImpl&) = delete;
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~MonoVadImpl() = default;
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int SampleRateHz() const override { return rnn_vad::kSampleRate24kHz; }
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void Reset() override { rnn_vad_.Reset(); }
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float Analyze(rtc::ArrayView<const float> frame) override {
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RTC_DCHECK_EQ(frame.size(), rnn_vad::kFrameSize10ms24kHz);
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std::array<float, rnn_vad::kFeatureVectorSize> feature_vector;
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const bool is_silence = features_extractor_.CheckSilenceComputeFeatures(
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/*samples=*/{frame.data(), rnn_vad::kFrameSize10ms24kHz},
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feature_vector);
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return rnn_vad_.ComputeVadProbability(feature_vector, is_silence);
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}
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private:
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rnn_vad::FeaturesExtractor features_extractor_;
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rnn_vad::RnnVad rnn_vad_;
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};
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} // namespace
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VoiceActivityDetectorWrapper::VoiceActivityDetectorWrapper(
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const AvailableCpuFeatures& cpu_features,
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int sample_rate_hz)
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: VoiceActivityDetectorWrapper(kVadResetPeriodMs,
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cpu_features,
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sample_rate_hz) {}
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VoiceActivityDetectorWrapper::VoiceActivityDetectorWrapper(
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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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: VoiceActivityDetectorWrapper(vad_reset_period_ms,
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std::make_unique<MonoVadImpl>(cpu_features),
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sample_rate_hz) {}
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VoiceActivityDetectorWrapper::VoiceActivityDetectorWrapper(
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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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: vad_reset_period_frames_(
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rtc::CheckedDivExact(vad_reset_period_ms, kFrameDurationMs)),
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time_to_vad_reset_(vad_reset_period_frames_),
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vad_(std::move(vad)) {
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RTC_DCHECK(vad_);
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RTC_DCHECK_GT(vad_reset_period_frames_, 1);
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resampled_buffer_.resize(
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rtc::CheckedDivExact(vad_->SampleRateHz(), kNumFramesPerSecond));
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Initialize(sample_rate_hz);
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}
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VoiceActivityDetectorWrapper::~VoiceActivityDetectorWrapper() = default;
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void VoiceActivityDetectorWrapper::Initialize(int sample_rate_hz) {
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RTC_DCHECK_GT(sample_rate_hz, 0);
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frame_size_ = rtc::CheckedDivExact(sample_rate_hz, kNumFramesPerSecond);
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int status =
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resampler_.InitializeIfNeeded(sample_rate_hz, vad_->SampleRateHz(),
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/*num_channels=*/1);
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constexpr int kStatusOk = 0;
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RTC_DCHECK_EQ(status, kStatusOk);
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vad_->Reset();
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}
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float VoiceActivityDetectorWrapper::Analyze(AudioFrameView<const float> frame) {
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// Periodically reset the VAD.
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time_to_vad_reset_--;
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if (time_to_vad_reset_ <= 0) {
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vad_->Reset();
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time_to_vad_reset_ = vad_reset_period_frames_;
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}
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// Resample the first channel of `frame`.
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RTC_DCHECK_EQ(frame.samples_per_channel(), frame_size_);
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// TODO: b/335805780 - channel() should return a MonoView<> which there
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// should be a Resample() implementation for. There's no need to
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// "deinterleave" a mono buffer, which is what Resample() currently does,
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// so here we should be able to directly resample the channel buffer.
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auto channel = frame.channel(0);
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InterleavedView<const float> src(channel.data(), channel.size(), 1);
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InterleavedView<float> dst(resampled_buffer_.data(), resampled_buffer_.size(),
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1);
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resampler_.Resample(src, dst);
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return vad_->Analyze(resampled_buffer_);
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}
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} // namespace webrtc
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