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// Copyright 2014 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_DECODER_SELECTOR_H_
#define MEDIA_FILTERS_DECODER_SELECTOR_H_
#include <memory>
#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_vector.h"
#include "base/memory/weak_ptr.h"
#include "build/build_config.h"
#include "media/base/demuxer_stream.h"
#include "media/base/pipeline_status.h"
#include "media/filters/decoder_stream_traits.h"
namespace base {
class SingleThreadTaskRunner;
}
namespace media {
class CdmContext;
class DecryptingDemuxerStream;
class MediaLog;
// DecoderSelector (creates if necessary and) initializes the proper
// Decoder for a given DemuxerStream. If the given DemuxerStream is
// encrypted, a DecryptingDemuxerStream may also be created.
// The template parameter |StreamType| is the type of stream we will be
// selecting a decoder for.
template<DemuxerStream::Type StreamType>
class MEDIA_EXPORT DecoderSelector {
public:
typedef DecoderStreamTraits<StreamType> StreamTraits;
typedef typename StreamTraits::DecoderType Decoder;
// Indicates completion of Decoder selection.
// - First parameter: The initialized Decoder. If it's set to NULL, then
// Decoder 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 Decoder.
// Note: The caller owns selected Decoder and DecryptingDemuxerStream.
// The caller should call DecryptingDemuxerStream::Reset() before
// calling Decoder::Reset() to release any pending decryption or read.
typedef base::Callback<void(std::unique_ptr<Decoder>,
std::unique_ptr<DecryptingDemuxerStream>)>
SelectDecoderCB;
// |decoders| contains the Decoders to use when initializing.
DecoderSelector(
const scoped_refptr<base::SingleThreadTaskRunner>& message_loop,
ScopedVector<Decoder> decoders,
const scoped_refptr<MediaLog>& media_log);
// Aborts pending Decoder selection and fires |select_decoder_cb| with
// NULL and NULL immediately if it's pending.
~DecoderSelector();
// Initializes and selects the first Decoder that can decode the |stream|.
// The selected Decoder (and DecryptingDemuxerStream) is returned via
// the |select_decoder_cb|.
// Notes:
// 1. This must not be called again before |select_decoder_cb| is run.
// 2. Decoders that fail to initialize will be deleted. Future calls will
// select from the decoders following the decoder that was last returned.
// 3. |cdm_context| is optional. If |cdm_context| is
// null, no CDM will be available to perform decryption.
void SelectDecoder(StreamTraits* traits,
DemuxerStream* stream,
CdmContext* cdm_context,
const SelectDecoderCB& select_decoder_cb,
const typename Decoder::OutputCB& output_cb,
const base::Closure& waiting_for_decryption_key_cb);
private:
#if !defined(OS_ANDROID)
void InitializeDecryptingDecoder();
void DecryptingDecoderInitDone(bool success);
#endif
void InitializeDecryptingDemuxerStream();
void DecryptingDemuxerStreamInitDone(PipelineStatus status);
void InitializeDecoder();
void DecoderInitDone(bool success);
void ReturnNullDecoder();
scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
ScopedVector<Decoder> decoders_;
scoped_refptr<MediaLog> media_log_;
StreamTraits* traits_;
DemuxerStream* input_stream_;
CdmContext* cdm_context_;
SelectDecoderCB select_decoder_cb_;
typename Decoder::OutputCB output_cb_;
base::Closure waiting_for_decryption_key_cb_;
std::unique_ptr<Decoder> decoder_;
std::unique_ptr<DecryptingDemuxerStream> decrypted_stream_;
// NOTE: Weak pointers must be invalidated before all other member variables.
base::WeakPtrFactory<DecoderSelector> weak_ptr_factory_;
DISALLOW_IMPLICIT_CONSTRUCTORS(DecoderSelector);
};
typedef DecoderSelector<DemuxerStream::VIDEO> VideoDecoderSelector;
typedef DecoderSelector<DemuxerStream::AUDIO> AudioDecoderSelector;
} // namespace media
#endif // MEDIA_FILTERS_DECODER_SELECTOR_H_