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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/audio_modem/audio_recorder_impl.h"
#include <algorithm>
#include <utility>
#include <vector>
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/logging.h"
#include "base/run_loop.h"
#include "base/synchronization/waitable_event.h"
#include "components/audio_modem/public/audio_modem_types.h"
#include "content/public/browser/browser_thread.h"
#include "media/audio/audio_manager.h"
#include "media/audio/audio_manager_base.h"
#include "media/base/audio_bus.h"
namespace audio_modem {
namespace {
const float kProcessIntervalMs = 500.0f; // milliseconds.
void AudioBusToString(scoped_ptr<media::AudioBus> source, std::string* buffer) {
buffer->resize(source->frames() * source->channels() * sizeof(float));
float* buffer_view = reinterpret_cast<float*>(string_as_array(buffer));
const int channels = source->channels();
for (int ch = 0; ch < channels; ++ch) {
for (int si = 0, di = ch; si < source->frames(); ++si, di += channels)
buffer_view[di] = source->channel(ch)[si];
}
}
// Called every kProcessIntervalMs to process the recorded audio. This
// converts our samples to the required sample rate, interleaves the samples
// and sends them to the whispernet decoder to process.
void ProcessSamples(
scoped_ptr<media::AudioBus> bus,
const AudioRecorderImpl::RecordedSamplesCallback& callback) {
std::string samples;
AudioBusToString(std::move(bus), &samples);
content::BrowserThread::PostTask(
content::BrowserThread::UI, FROM_HERE, base::Bind(callback, samples));
}
} // namespace
// Public methods.
AudioRecorderImpl::AudioRecorderImpl()
: is_recording_(false),
stream_(nullptr),
total_buffer_frames_(0),
buffer_frame_index_(0) {
}
void AudioRecorderImpl::Initialize(
const RecordedSamplesCallback& decode_callback) {
decode_callback_ = decode_callback;
media::AudioManager::Get()->GetTaskRunner()->PostTask(
FROM_HERE,
base::Bind(&AudioRecorderImpl::InitializeOnAudioThread,
base::Unretained(this)));
}
AudioRecorderImpl::~AudioRecorderImpl() {
}
void AudioRecorderImpl::Record() {
media::AudioManager::Get()->GetTaskRunner()->PostTask(
FROM_HERE,
base::Bind(&AudioRecorderImpl::RecordOnAudioThread,
base::Unretained(this)));
}
void AudioRecorderImpl::Stop() {
media::AudioManager::Get()->GetTaskRunner()->PostTask(
FROM_HERE,
base::Bind(&AudioRecorderImpl::StopOnAudioThread,
base::Unretained(this)));
}
void AudioRecorderImpl::Finalize() {
media::AudioManager::Get()->GetTaskRunner()->PostTask(
FROM_HERE,
base::Bind(&AudioRecorderImpl::FinalizeOnAudioThread,
base::Unretained(this)));
}
// Private methods.
void AudioRecorderImpl::InitializeOnAudioThread() {
DCHECK(media::AudioManager::Get()->GetTaskRunner()->BelongsToCurrentThread());
media::AudioParameters params;
if (params_for_testing_) {
params = *params_for_testing_;
} else {
params = media::AudioManager::Get()->GetInputStreamParameters(
media::AudioManagerBase::kDefaultDeviceId);
params.set_effects(media::AudioParameters::NO_EFFECTS);
}
total_buffer_frames_ = kProcessIntervalMs * params.sample_rate() / 1000;
buffer_ = media::AudioBus::Create(params.channels(), total_buffer_frames_);
buffer_frame_index_ = 0;
stream_ = input_stream_for_testing_
? input_stream_for_testing_.get()
: media::AudioManager::Get()->MakeAudioInputStream(
params, media::AudioManagerBase::kDefaultDeviceId);
if (!stream_ || !stream_->Open()) {
LOG(ERROR) << "Failed to open an input stream.";
if (stream_) {
stream_->Close();
stream_ = nullptr;
}
return;
}
stream_->SetVolume(stream_->GetMaxVolume());
}
void AudioRecorderImpl::RecordOnAudioThread() {
DCHECK(media::AudioManager::Get()->GetTaskRunner()->BelongsToCurrentThread());
if (!stream_ || is_recording_)
return;
VLOG(3) << "Starting recording.";
stream_->Start(this);
is_recording_ = true;
}
void AudioRecorderImpl::StopOnAudioThread() {
DCHECK(media::AudioManager::Get()->GetTaskRunner()->BelongsToCurrentThread());
if (!stream_ || !is_recording_)
return;
VLOG(3) << "Stopping recording.";
stream_->Stop();
is_recording_ = false;
}
void AudioRecorderImpl::StopAndCloseOnAudioThread() {
DCHECK(media::AudioManager::Get()->GetTaskRunner()->BelongsToCurrentThread());
if (!stream_)
return;
StopOnAudioThread();
stream_->Close();
stream_ = nullptr;
}
void AudioRecorderImpl::FinalizeOnAudioThread() {
DCHECK(media::AudioManager::Get()->GetTaskRunner()->BelongsToCurrentThread());
StopAndCloseOnAudioThread();
delete this;
}
void AudioRecorderImpl::OnData(media::AudioInputStream* stream,
const media::AudioBus* source,
uint32_t /* hardware_delay_bytes */,
double /* volume */) {
// source->frames() == source_params.frames_per_buffer(), so we only have
// one chunk of data in the source; correspondingly set the destination
// size to one chunk.
int remaining_buffer_frames = buffer_->frames() - buffer_frame_index_;
int frames_to_copy = std::min(remaining_buffer_frames, source->frames());
source->CopyPartialFramesTo(0, frames_to_copy, buffer_frame_index_,
buffer_.get());
buffer_frame_index_ += frames_to_copy;
// Buffer full, send it for processing.
if (buffer_->frames() == buffer_frame_index_) {
ProcessSamples(std::move(buffer_), decode_callback_);
buffer_ = media::AudioBus::Create(source->channels(), total_buffer_frames_);
buffer_frame_index_ = 0;
// Copy any remaining frames in the source to our buffer.
int remaining_source_frames = source->frames() - frames_to_copy;
source->CopyPartialFramesTo(frames_to_copy, remaining_source_frames,
buffer_frame_index_, buffer_.get());
buffer_frame_index_ += remaining_source_frames;
}
}
void AudioRecorderImpl::OnError(media::AudioInputStream* /* stream */) {
LOG(ERROR) << "Error during sound recording.";
media::AudioManager::Get()->GetTaskRunner()->PostTask(
FROM_HERE,
base::Bind(&AudioRecorderImpl::StopAndCloseOnAudioThread,
base::Unretained(this)));
}
void AudioRecorderImpl::FlushAudioLoopForTesting() {
if (media::AudioManager::Get()->GetTaskRunner()->BelongsToCurrentThread())
return;
// Queue task on the audio thread, when it is executed, that means we've
// successfully executed all the tasks before us.
base::RunLoop rl;
media::AudioManager::Get()->GetTaskRunner()->PostTaskAndReply(
FROM_HERE,
base::Bind(
base::IgnoreResult(&AudioRecorderImpl::FlushAudioLoopForTesting),
base::Unretained(this)),
rl.QuitClosure());
rl.Run();
}
} // namespace audio_modem
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