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/*
* Copyright 2012 Google Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef MEDIA_FILTERS_SHELL_DEMUXER_H_
#define MEDIA_FILTERS_SHELL_DEMUXER_H_
#include <deque>
#include <map>
#include <vector>
#include "base/message_loop.h"
#include "base/threading/thread.h"
#include "media/base/demuxer.h"
#include "media/base/demuxer_stream.h"
#include "media/base/ranges.h"
#include "media/base/shell_buffer_factory.h"
#include "media/filters/shell_parser.h"
namespace media {
class DecoderBuffer;
class ShellDemuxer;
class ShellDemuxerStream : public DemuxerStream {
public:
ShellDemuxerStream(ShellDemuxer* demuxer, Type type);
// DemuxerStream implementation
virtual void Read(const ReadCB& read_cb) OVERRIDE;
virtual const AudioDecoderConfig& audio_decoder_config() OVERRIDE;
virtual const VideoDecoderConfig& video_decoder_config() OVERRIDE;
virtual Type type() OVERRIDE;
virtual void EnableBitstreamConverter() OVERRIDE;
virtual bool StreamWasEncrypted() const OVERRIDE;
// Functions used by ShellDemuxer
Ranges<base::TimeDelta> GetBufferedRanges();
void EnqueueBuffer(scoped_refptr<DecoderBuffer> buffer);
void FlushBuffers();
void Stop();
base::TimeDelta GetLastBufferTimestamp() const;
private:
// The Ranges object doesn't offer a complement object so we rebuild
// enqueued ranges from the union of all of the buffers in the queue.
// Call me whenever _removing_ data from buffer_queue_.
void RebuildEnqueuedRanges_Locked();
// non-owning pointer to avoid circular reference
ShellDemuxer* demuxer_;
Type type_;
// Used to protect everything below.
mutable base::Lock lock_;
// Keeps track of all time ranges this object has seen since creation.
// The demuxer uses these ranges to update the pipeline about what data
// it has demuxed.
Ranges<base::TimeDelta> buffered_ranges_;
// The last timestamp of buffer enqueued. This is used in two places:
// 1. Used with the timestamp of the current frame to calculate the
// buffer range.
// 2. Used by the demuxer to deteminate what type of frame to get next.
base::TimeDelta last_buffer_timestamp_;
bool stopped_;
typedef std::deque<scoped_refptr<DecoderBuffer> > BufferQueue;
BufferQueue buffer_queue_;
typedef std::deque<ReadCB> ReadQueue;
ReadQueue read_queue_;
DISALLOW_COPY_AND_ASSIGN(ShellDemuxerStream);
};
class MEDIA_EXPORT ShellDemuxer : public Demuxer {
public:
ShellDemuxer(const scoped_refptr<base::MessageLoopProxy>& message_loop,
const scoped_refptr<DataSource>& data_source);
virtual ~ShellDemuxer();
// Demuxer implementation.
virtual void Initialize(DemuxerHost* host,
const PipelineStatusCB& status_cb) OVERRIDE;
virtual void Stop(const base::Closure& callback) OVERRIDE;
virtual void Seek(base::TimeDelta time, const PipelineStatusCB& cb) OVERRIDE;
virtual void OnAudioRendererDisabled() OVERRIDE;
virtual void SetPlaybackRate(float playback_rate) OVERRIDE;
virtual scoped_refptr<DemuxerStream> GetStream(
DemuxerStream::Type type) OVERRIDE;
virtual base::TimeDelta GetStartTime() const OVERRIDE;
// TODO: Consider move the following functions to private section.
// Issues a task to the demuxer to identify the next buffer of provided type
// in the stream, allocate memory to contain that buffer, download the bytes
// in to it, and enqueue the data in the appropriate demuxer stream.
void Request(DemuxerStream::Type type);
// The DemuxerStream objects ask their parent ShellDemuxer stream class
// for these configuration data rather than duplicating in the child classes
const AudioDecoderConfig& AudioConfig();
const VideoDecoderConfig& VideoConfig();
// Provide access to ShellDemuxerStream.
bool MessageLoopBelongsToCurrentThread() const;
// Callback from ShellBufferFactory
void BufferAllocated(scoped_refptr<DecoderBuffer> buffer);
private:
void ParseConfigDone(const PipelineStatusCB& status_cb,
PipelineStatus status);
void DataSourceStopped(const base::Closure& callback);
// methods that perform blocking I/O, and are therefore run on the
// blocking_thread_
// download enough of the stream to parse the configuration. returns
// false on error.
PipelineStatus ParseConfigBlocking(const PipelineStatusCB& status_cb);
void RequestTask(DemuxerStream::Type type);
void DownloadTask(scoped_refptr<DecoderBuffer> buffer);
void IssueNextRequestTask();
void SeekTask(base::TimeDelta time, const PipelineStatusCB& cb);
scoped_refptr<base::MessageLoopProxy> message_loop_;
DemuxerHost* host_;
// Thread on which all blocking operations are executed.
base::Thread blocking_thread_;
scoped_refptr<DataSource> data_source_;
scoped_refptr<ShellDataSourceReader> reader_;
bool stopped_;
bool flushing_;
scoped_refptr<ShellDemuxerStream> audio_demuxer_stream_;
scoped_refptr<ShellDemuxerStream> video_demuxer_stream_;
scoped_refptr<ShellParser> parser_;
scoped_refptr<ShellAU> requested_au_;
bool audio_reached_eos_;
bool video_reached_eos_;
};
} // namespace media
#endif // MEDIA_FILTERS_SHELL_DEMUXER_H_