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// Copyright (c) 2013 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.
#ifndef MEDIA_AUDIO_FAKE_AUDIO_CONSUMER_H_
#define MEDIA_AUDIO_FAKE_AUDIO_CONSUMER_H_
#include "base/cancelable_callback.h"
#include "base/memory/scoped_ptr.h"
#include "base/time.h"
#include "media/audio/audio_parameters.h"
namespace base {
class MessageLoopProxy;
}
namespace media {
class AudioBus;
// A fake audio consumer. Using a provided message loop, FakeAudioConsumer will
// simulate a real time consumer of audio data.
class MEDIA_EXPORT FakeAudioConsumer {
public:
// |message_loop| is the loop on which the ReadCB provided to Start() will be
// executed on. |params| is used to determine the frequency of callbacks.
FakeAudioConsumer(const scoped_refptr<base::MessageLoopProxy>& message_loop,
const AudioParameters& params);
~FakeAudioConsumer();
// Start executing |read_cb| at a regular interval. Must be called on the
// message loop provided during construction. Stop() must be called before
// destroying FakeAudioConsumer.
typedef base::Callback<void(AudioBus* audio_bus)> ReadCB;
void Start(const ReadCB& read_cb);
// Stop executing the ReadCB provided to Start(). Cancels any outstanding
// callbacks. Safe to call multiple times. Must be called on the message
// loop provided during construction.
void Stop();
private:
// Task that regularly calls |read_cb_| according to the playback rate as
// determined by the audio parameters given during construction. Runs on
// |message_loop_|.
void DoRead();
scoped_refptr<base::MessageLoopProxy> message_loop_;
ReadCB read_cb_;
scoped_ptr<AudioBus> audio_bus_;
base::TimeDelta buffer_duration_;
base::Time next_read_time_;
// Used to post delayed tasks to the AudioThread that we can cancel.
base::CancelableClosure read_task_cb_;
DISALLOW_COPY_AND_ASSIGN(FakeAudioConsumer);
};
} // namespace media
#endif // MEDIA_AUDIO_FAKE_AUDIO_CONSUMER_H_
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