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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 "base/cancelable_callback.h"
#include "base/memory/scoped_ptr.h"
#include "media/audio/audio_io.h"
#include "media/audio/audio_parameters.h"
namespace media {
class AudioManagerBase;
// A fake implementation of AudioOutputStream. Used for testing and when a real
// audio output device is unavailable or refusing output (e.g. remote desktop).
class MEDIA_EXPORT FakeAudioOutputStream : public AudioOutputStream {
static AudioOutputStream* MakeFakeStream(AudioManagerBase* manager,
const AudioParameters& params);
// AudioOutputStream implementation.
virtual bool Open() OVERRIDE;
virtual void Start(AudioSourceCallback* callback) OVERRIDE;
virtual void Stop() OVERRIDE;
virtual void SetVolume(double volume) OVERRIDE;
virtual void GetVolume(double* volume) OVERRIDE;
virtual void Close() OVERRIDE;
FakeAudioOutputStream(AudioManagerBase* manager,
const AudioParameters& params);
virtual ~FakeAudioOutputStream();
// Task that regularly calls |callback_->OnMoreData()| according to the
// playback rate as determined by the audio parameters given during
// construction. Runs on AudioManager's message loop.
void OnMoreDataTask();
AudioManagerBase* audio_manager_;
AudioSourceCallback* callback_;
scoped_ptr<AudioBus> audio_bus_;
float frames_per_millisecond_;
// Used to post delayed tasks to the AudioThread that we can cancel.
base::CancelableClosure on_more_data_cb_;
} // namespace media