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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_FILTERS_AUDIO_DECODER_SELECTOR_H_
#define MEDIA_FILTERS_AUDIO_DECODER_SELECTOR_H_
#include <list>
#include "base/callback.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "media/base/audio_decoder.h"
#include "media/base/decryptor.h"
#include "media/base/demuxer_stream.h"
namespace base {
class MessageLoopProxy;
}
namespace media {
class DecoderBuffer;
class DecryptingDemuxerStream;
class Decryptor;
// AudioDecoderSelector (creates if necessary and) initializes the proper
// AudioDecoder for a given DemuxerStream. If the given DemuxerStream is
// encrypted, a DecryptingDemuxerStream may also be created.
class MEDIA_EXPORT AudioDecoderSelector {
public:
typedef std::list<scoped_refptr<AudioDecoder> > AudioDecoderList;
// Indicates completion of AudioDecoder selection.
// - First parameter: The initialized AudioDecoder. If it's set to NULL, then
// AudioDecoder initialization failed.
// - Second parameter: The initialized DecryptingDemuxerStream. If it's not
// NULL, then a DecryptingDemuxerStream is created and initialized to do
// decryption for the initialized AudioDecoder.
// Note: The caller owns selected AudioDecoder and DecryptingDemuxerStream.
// The caller should call DecryptingDemuxerStream::Reset() before
// calling AudioDecoder::Reset() to release any pending decryption or read.
typedef base::Callback<
void(const scoped_refptr<AudioDecoder>&,
const scoped_refptr<DecryptingDemuxerStream>&)> SelectDecoderCB;
// |set_decryptor_ready_cb| is optional. If |set_decryptor_ready_cb| is null,
// no decryptor will be available to perform decryption.
AudioDecoderSelector(
const scoped_refptr<base::MessageLoopProxy>& message_loop,
const AudioDecoderList& decoders,
const SetDecryptorReadyCB& set_decryptor_ready_cb);
~AudioDecoderSelector();
// Initializes and selects an AudioDecoder that can decode the |stream|.
// Selected AudioDecoder (and DecryptingDemuxerStream) is returned via
// the |select_decoder_cb|.
void SelectAudioDecoder(const scoped_refptr<DemuxerStream>& stream,
const StatisticsCB& statistics_cb,
const SelectDecoderCB& select_decoder_cb);
private:
void DecryptingAudioDecoderInitDone(PipelineStatus status);
void DecryptingDemuxerStreamInitDone(PipelineStatus status);
void InitializeNextDecoder();
void DecoderInitDone(PipelineStatus status);
scoped_refptr<base::MessageLoopProxy> message_loop_;
AudioDecoderList decoders_;
SetDecryptorReadyCB set_decryptor_ready_cb_;
scoped_refptr<DemuxerStream> input_stream_;
StatisticsCB statistics_cb_;
SelectDecoderCB select_decoder_cb_;
scoped_refptr<AudioDecoder> audio_decoder_;
scoped_refptr<DecryptingDemuxerStream> decrypted_stream_;
base::WeakPtrFactory<AudioDecoderSelector> weak_ptr_factory_;
DISALLOW_IMPLICIT_CONSTRUCTORS(AudioDecoderSelector);
};
} // namespace media
#endif // MEDIA_FILTERS_AUDIO_DECODER_SELECTOR_H_
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