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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "remoting/host/linux/audio_capturer_linux.h"
#include <stdint.h>
#include <utility>
#include "base/check.h"
#include "base/files/file_path.h"
#include "base/lazy_instance.h"
#include "base/memory/ptr_util.h"
#include "base/task/single_thread_task_runner.h"
#include "remoting/proto/audio.pb.h"
namespace remoting {
namespace {
base::LazyInstance<scoped_refptr<AudioPipeReader>>::Leaky
g_pulseaudio_pipe_sink_reader = LAZY_INSTANCE_INITIALIZER;
} // namespace
// TODO(wez): Remove this and have the DesktopEnvironmentFactory own the
// AudioPipeReader rather than having it process-global.
// See crbug.com/161373 and crbug.com/104544.
void AudioCapturerLinux::InitializePipeReader(
scoped_refptr<base::SingleThreadTaskRunner> task_runner,
const base::FilePath& pipe_name) {
scoped_refptr<AudioPipeReader> pipe_reader;
if (!pipe_name.empty()) {
pipe_reader = AudioPipeReader::Create(task_runner, pipe_name);
}
g_pulseaudio_pipe_sink_reader.Get() = pipe_reader;
}
AudioCapturerLinux::AudioCapturerLinux(
scoped_refptr<AudioPipeReader> pipe_reader)
: pipe_reader_(pipe_reader), silence_detector_(0) {}
AudioCapturerLinux::~AudioCapturerLinux() {
pipe_reader_->RemoveObserver(this);
}
bool AudioCapturerLinux::Start(const PacketCapturedCallback& callback) {
callback_ = callback;
silence_detector_.Reset(AudioPipeReader::kSamplingRate,
AudioPipeReader::kChannels);
pipe_reader_->AddObserver(this);
return true;
}
void AudioCapturerLinux::OnDataRead(
scoped_refptr<base::RefCountedString> data) {
DCHECK(!callback_.is_null());
if (silence_detector_.IsSilence(
// TODO(danakj): This cast can cause UB, we should copy into integers
// or pass it as a byte span.
reinterpret_cast<const int16_t*>(data->as_string().data()),
data->as_string().size() / sizeof(int16_t) /
AudioPipeReader::kChannels)) {
return;
}
auto packet = std::make_unique<AudioPacket>();
packet->add_data(data->as_string());
packet->set_encoding(AudioPacket::ENCODING_RAW);
packet->set_sampling_rate(AudioPipeReader::kSamplingRate);
packet->set_bytes_per_sample(AudioPipeReader::kBytesPerSample);
packet->set_channels(AudioPipeReader::kChannels);
callback_.Run(std::move(packet));
}
bool AudioCapturer::IsSupported() {
return g_pulseaudio_pipe_sink_reader.Get().get() != nullptr;
}
std::unique_ptr<AudioCapturer> AudioCapturer::Create() {
scoped_refptr<AudioPipeReader> reader = g_pulseaudio_pipe_sink_reader.Get();
if (!reader.get()) {
return nullptr;
}
return base::WrapUnique(new AudioCapturerLinux(reader));
}
} // namespace remoting
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