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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 "media/audio/fake_audio_output_stream.h"
#include "base/check.h"
#include "base/functional/bind.h"
#include "base/functional/callback_helpers.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, {}, audio_bus_.get());
}
void FakeAudioOutputStream::SetMute(bool muted) {}
} // namespace media
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