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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.
#ifndef MEDIA_BASE_AUDIO_RENDERER_H_
#define MEDIA_BASE_AUDIO_RENDERER_H_
#include "base/callback.h"
#include "base/time/time.h"
#include "media/base/buffering_state.h"
#include "media/base/decryptor.h"
#include "media/base/media_export.h"
#include "media/base/pipeline_status.h"
namespace media {
class DemuxerStream;
class TimeSource;
class MEDIA_EXPORT AudioRenderer {
public:
AudioRenderer();
// Stop all operations and fire all pending callbacks.
virtual ~AudioRenderer();
// Initialize an AudioRenderer with |stream|, executing |init_cb| upon
// completion. If initialization fails, only |init_cb| (not |error_cb|) will
// be called.
//
// |set_decryptor_ready_cb| is fired when a Decryptor is needed, i.e. when the
// |stream| is encrypted.
//
// |statistics_cb| is executed periodically with audio rendering stats.
//
// |buffering_state_cb| is executed when audio rendering has either run out of
// data or has enough data to continue playback.
//
// |ended_cb| is executed when audio rendering has reached the end of stream.
//
// |error_cb| is executed if an error was encountered after initialization.
//
// |waiting_for_decryption_key_cb| is called whenever the key needed to
// decrypt the stream is not available.
virtual void Initialize(
DemuxerStream* stream,
const PipelineStatusCB& init_cb,
const SetDecryptorReadyCB& set_decryptor_ready_cb,
const StatisticsCB& statistics_cb,
const BufferingStateCB& buffering_state_cb,
const base::Closure& ended_cb,
const PipelineStatusCB& error_cb,
const base::Closure& waiting_for_decryption_key_cb) = 0;
// Returns the TimeSource associated with audio rendering.
virtual TimeSource* GetTimeSource() = 0;
// Discard any audio data, executing |callback| when completed.
//
// Clients should expect |buffering_state_cb| to be called with
// BUFFERING_HAVE_NOTHING while flushing is in progress.
virtual void Flush(const base::Closure& callback) = 0;
// Starts playback by reading from |stream| and decoding and rendering audio.
//
// Only valid to call after a successful Initialize() or Flush().
virtual void StartPlaying() = 0;
// Sets the output volume.
virtual void SetVolume(float volume) = 0;
private:
DISALLOW_COPY_AND_ASSIGN(AudioRenderer);
};
} // namespace media
#endif // MEDIA_BASE_AUDIO_RENDERER_H_
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