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// Copyright (c) 2012 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/null_audio_sink.h"
#include "base/bind.h"
#include "base/location.h"
#include "base/single_thread_task_runner.h"
#include "base/threading/sequenced_task_runner_handle.h"
#include "media/base/audio_hash.h"
#include "media/base/fake_audio_worker.h"
namespace media {
NullAudioSink::NullAudioSink(
const scoped_refptr<base::SingleThreadTaskRunner>& task_runner)
: initialized_(false),
started_(false),
playing_(false),
callback_(nullptr),
task_runner_(task_runner) {}
NullAudioSink::~NullAudioSink() = default;
void NullAudioSink::Initialize(const AudioParameters& params,
RenderCallback* callback) {
DCHECK(!started_);
fake_worker_.reset(new FakeAudioWorker(task_runner_, params));
fixed_data_delay_ = FakeAudioWorker::ComputeFakeOutputDelay(params);
audio_bus_ = AudioBus::Create(params);
callback_ = callback;
initialized_ = true;
}
void NullAudioSink::Start() {
DCHECK(task_runner_->BelongsToCurrentThread());
DCHECK(initialized_);
DCHECK(!started_);
started_ = true;
}
void NullAudioSink::Stop() {
DCHECK(task_runner_->BelongsToCurrentThread());
started_ = false;
// Stop may be called at any time, so we have to check before stopping.
if (fake_worker_)
fake_worker_->Stop();
}
void NullAudioSink::Play() {
DCHECK(task_runner_->BelongsToCurrentThread());
DCHECK(started_);
if (playing_)
return;
fake_worker_->Start(
base::BindRepeating(&NullAudioSink::CallRender, base::Unretained(this)));
playing_ = true;
}
void NullAudioSink::Pause() {
DCHECK(task_runner_->BelongsToCurrentThread());
DCHECK(started_);
if (!playing_)
return;
fake_worker_->Stop();
playing_ = false;
}
void NullAudioSink::Flush() {}
bool NullAudioSink::SetVolume(double volume) {
// Audio is always muted.
return volume == 0.0;
}
OutputDeviceInfo NullAudioSink::GetOutputDeviceInfo() {
return OutputDeviceInfo(OUTPUT_DEVICE_STATUS_OK);
}
void NullAudioSink::GetOutputDeviceInfoAsync(OutputDeviceInfoCB info_cb) {
base::SequencedTaskRunnerHandle::Get()->PostTask(
FROM_HERE, base::BindOnce(std::move(info_cb), GetOutputDeviceInfo()));
}
bool NullAudioSink::IsOptimizedForHardwareParameters() {
return false;
}
bool NullAudioSink::CurrentThreadIsRenderingThread() {
return task_runner_->BelongsToCurrentThread();
}
void NullAudioSink::SwitchOutputDevice(const std::string& device_id,
OutputDeviceStatusCB callback) {
std::move(callback).Run(OUTPUT_DEVICE_STATUS_ERROR_INTERNAL);
}
void NullAudioSink::CallRender(base::TimeTicks ideal_time,
base::TimeTicks now) {
DCHECK(task_runner_->BelongsToCurrentThread());
// Since NullAudioSink is only used for cases where a real audio sink was not
// available, provide "idealized" delay-timing arguments. This will drive the
// smoothest playback (since video is sync'ed to audio). See
// content::AudioRendererImpl and media::AudioClock for further details.
int frames_received =
callback_->Render(fixed_data_delay_, ideal_time, 0, audio_bus_.get());
if (!audio_hash_ || frames_received <= 0)
return;
audio_hash_->Update(audio_bus_.get(), frames_received);
}
void NullAudioSink::StartAudioHashForTesting() {
DCHECK(!initialized_);
audio_hash_.reset(new AudioHash());
}
std::string NullAudioSink::GetAudioHashForTesting() {
return audio_hash_ ? audio_hash_->ToString() : std::string();
}
} // namespace media
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