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// Copyright 2017 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 "media/audio/audio_system_impl.h"
#include "base/memory/ptr_util.h"
#include "base/single_thread_task_runner.h"
#include "base/task_runner_util.h"
#include "media/audio/audio_manager.h"
// Using base::Unretained for |audio_manager_| is safe since it is deleted after
// its task runner, and AudioSystemImpl is deleted on the UI thread after the IO
// thread has been stopped and before |audio_manager_| deletion is scheduled.
namespace media {
namespace {
AudioParameters GetInputParametersOnDeviceThread(AudioManager* audio_manager,
const std::string& device_id) {
DCHECK(audio_manager->GetTaskRunner()->BelongsToCurrentThread());
// TODO(olka): remove this when AudioManager::GetInputStreamParameters()
// works this way on all the platforms.
if (!audio_manager->HasAudioInputDevices())
return AudioParameters();
return audio_manager->GetInputStreamParameters(device_id);
}
} // namespace
AudioSystemImpl::AudioSystemImpl(AudioManager* audio_manager)
: audio_manager_(audio_manager) {
DCHECK(audio_manager_);
AudioSystem::SetInstance(this);
}
AudioSystemImpl::~AudioSystemImpl() {
AudioSystem::ClearInstance(this);
}
// static
std::unique_ptr<AudioSystem> AudioSystemImpl::Create(
AudioManager* audio_manager) {
return base::WrapUnique(new AudioSystemImpl(audio_manager));
}
void AudioSystemImpl::GetInputStreamParameters(
const std::string& device_id,
OnAudioParamsCallback on_params_cb) const {
if (GetTaskRunner()->BelongsToCurrentThread()) {
GetTaskRunner()->PostTask(
FROM_HERE, base::Bind(on_params_cb, GetInputParametersOnDeviceThread(
audio_manager_, device_id)));
return;
}
base::PostTaskAndReplyWithResult(
GetTaskRunner(), FROM_HERE,
base::Bind(&GetInputParametersOnDeviceThread,
base::Unretained(audio_manager_), device_id),
std::move(on_params_cb));
}
void AudioSystemImpl::HasInputDevices(OnBoolCallback on_has_devices_cb) const {
if (GetTaskRunner()->BelongsToCurrentThread()) {
GetTaskRunner()->PostTask(
FROM_HERE,
base::Bind(on_has_devices_cb, audio_manager_->HasAudioInputDevices()));
return;
}
base::PostTaskAndReplyWithResult(
GetTaskRunner(), FROM_HERE,
base::Bind(&AudioManager::HasAudioInputDevices,
base::Unretained(audio_manager_)),
std::move(on_has_devices_cb));
}
AudioManager* AudioSystemImpl::GetAudioManager() const {
return audio_manager_;
}
base::SingleThreadTaskRunner* AudioSystemImpl::GetTaskRunner() const {
return audio_manager_->GetTaskRunner();
}
} // namespace media
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