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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/fake_audio_output_stream.h"
- #include "base/bind.h"
- #include "base/callback_helpers.h"
- #include "base/check.h"
- #include "base/task/single_thread_task_runner.h"
- #include "base/time/time.h"
- #include "media/audio/audio_manager_base.h"
- namespace media {
- // static
- AudioOutputStream* FakeAudioOutputStream::MakeFakeStream(
- AudioManagerBase* manager, const AudioParameters& params) {
- return new FakeAudioOutputStream(manager, params);
- }
- FakeAudioOutputStream::FakeAudioOutputStream(AudioManagerBase* manager,
- const AudioParameters& params)
- : audio_manager_(manager),
- fixed_data_delay_(FakeAudioWorker::ComputeFakeOutputDelay(params)),
- callback_(nullptr),
- fake_worker_(manager->GetWorkerTaskRunner(), params),
- audio_bus_(AudioBus::Create(params)) {}
- FakeAudioOutputStream::~FakeAudioOutputStream() {
- DCHECK(!callback_);
- }
- bool FakeAudioOutputStream::Open() {
- DCHECK(audio_manager_->GetTaskRunner()->BelongsToCurrentThread());
- audio_bus_->Zero();
- return true;
- }
- void FakeAudioOutputStream::Start(AudioSourceCallback* callback) {
- DCHECK(audio_manager_->GetTaskRunner()->BelongsToCurrentThread());
- callback_ = callback;
- fake_worker_.Start(base::BindRepeating(&FakeAudioOutputStream::CallOnMoreData,
- base::Unretained(this)));
- }
- void FakeAudioOutputStream::Stop() {
- DCHECK(audio_manager_->GetTaskRunner()->BelongsToCurrentThread());
- fake_worker_.Stop();
- callback_ = nullptr;
- }
- void FakeAudioOutputStream::Close() {
- DCHECK(!callback_);
- DCHECK(audio_manager_->GetTaskRunner()->BelongsToCurrentThread());
- audio_manager_->ReleaseOutputStream(this);
- }
- void FakeAudioOutputStream::Flush() {}
- void FakeAudioOutputStream::SetVolume(double volume) {}
- void FakeAudioOutputStream::GetVolume(double* volume) {
- *volume = 0;
- }
- void FakeAudioOutputStream::CallOnMoreData(base::TimeTicks ideal_time,
- base::TimeTicks now) {
- DCHECK(audio_manager_->GetWorkerTaskRunner()->BelongsToCurrentThread());
- // Real streams provide small tweaks to their delay values, alongside the
- // current system time; and so the same is done here.
- const auto delay =
- fixed_data_delay_ + std::max(base::TimeDelta(), ideal_time - now);
- callback_->OnMoreData(delay, now, 0, audio_bus_.get());
- }
- void FakeAudioOutputStream::SetMute(bool muted) {}
- } // namespace media
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