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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_WEBM_WEBM_CLUSTER_PARSER_H_
#define MEDIA_WEBM_WEBM_CLUSTER_PARSER_H_
#include <deque>
#include <map>
#include <set>
#include <string>
#include "base/memory/scoped_ptr.h"
#include "media/base/media_export.h"
#include "media/base/media_log.h"
#include "media/base/stream_parser_buffer.h"
#include "media/webm/webm_parser.h"
#include "media/webm/webm_tracks_parser.h"
namespace media {
class MEDIA_EXPORT WebMClusterParser : public WebMParserClient {
private:
// Helper class that manages per-track state.
class Track {
public:
Track(int track_num, bool is_video);
~Track();
int track_num() const { return track_num_; }
const std::deque<scoped_refptr<StreamParserBuffer> >& buffers() const {
return buffers_;
}
bool AddBuffer(const scoped_refptr<StreamParserBuffer>& buffer);
// Clears all buffer state.
void Reset();
// Helper function used to inspect block data to determine if the
// block is a keyframe.
// |data| contains the bytes in the block.
// |size| indicates the number of bytes in |data|.
bool IsKeyframe(const uint8* data, int size) const;
private:
int track_num_;
std::deque<scoped_refptr<StreamParserBuffer> > buffers_;
bool is_video_;
};
typedef std::map<int, Track> TextTrackMap;
public:
typedef std::deque<scoped_refptr<StreamParserBuffer> > BufferQueue;
class MEDIA_EXPORT TextTrackIterator {
public:
explicit TextTrackIterator(const TextTrackMap& text_track_map);
TextTrackIterator(const TextTrackIterator& rhs);
~TextTrackIterator();
// To visit each text track. If the iterator is exhausted, it returns
// as parameters the values 0 and NULL, and the function returns false.
// Otherwise, it returns the buffers for the associated track, and the
// function returns true.
bool operator()(int* track_num, const BufferQueue** buffers);
private:
TextTrackIterator& operator=(const TextTrackIterator&);
TextTrackMap::const_iterator iterator_;
const TextTrackMap::const_iterator iterator_end_;
};
WebMClusterParser(int64 timecode_scale,
int audio_track_num,
int video_track_num,
const WebMTracksParser::TextTracks& text_tracks,
const std::set<int64>& ignored_tracks,
const std::string& audio_encryption_key_id,
const std::string& video_encryption_key_id,
const LogCB& log_cb);
virtual ~WebMClusterParser();
// Resets the parser state so it can accept a new cluster.
void Reset();
// Parses a WebM cluster element in |buf|.
//
// Returns -1 if the parse fails.
// Returns 0 if more data is needed.
// Returns the number of bytes parsed on success.
int Parse(const uint8* buf, int size);
base::TimeDelta cluster_start_time() const { return cluster_start_time_; }
const BufferQueue& audio_buffers() const { return audio_.buffers(); }
const BufferQueue& video_buffers() const { return video_.buffers(); }
// Returns an iterator object, allowing each text track to be visited.
TextTrackIterator CreateTextTrackIterator() const;
// Returns true if the last Parse() call stopped at the end of a cluster.
bool cluster_ended() const { return cluster_ended_; }
private:
// WebMParserClient methods.
virtual WebMParserClient* OnListStart(int id) OVERRIDE;
virtual bool OnListEnd(int id) OVERRIDE;
virtual bool OnUInt(int id, int64 val) OVERRIDE;
virtual bool OnBinary(int id, const uint8* data, int size) OVERRIDE;
bool ParseBlock(bool is_simple_block, const uint8* buf, int size,
const uint8* additional, int additional_size, int duration,
int64 discard_padding);
bool OnBlock(bool is_simple_block, int track_num, int timecode, int duration,
int flags, const uint8* data, int size,
const uint8* additional, int additional_size,
int64 discard_padding);
// Resets the Track objects associated with each text track.
void ResetTextTracks();
// Search for the indicated track_num among the text tracks. Returns NULL
// if that track num is not a text track.
Track* FindTextTrack(int track_num);
double timecode_multiplier_; // Multiplier used to convert timecodes into
// microseconds.
std::set<int64> ignored_tracks_;
std::string audio_encryption_key_id_;
std::string video_encryption_key_id_;
WebMListParser parser_;
int64 last_block_timecode_;
scoped_ptr<uint8[]> block_data_;
int block_data_size_;
int64 block_duration_;
int64 block_add_id_;
scoped_ptr<uint8[]> block_additional_data_;
int block_additional_data_size_;
int64 discard_padding_;
bool discard_padding_set_;
int64 cluster_timecode_;
base::TimeDelta cluster_start_time_;
bool cluster_ended_;
Track audio_;
Track video_;
TextTrackMap text_track_map_;
LogCB log_cb_;
DISALLOW_IMPLICIT_CONSTRUCTORS(WebMClusterParser);
};
} // namespace media
#endif // MEDIA_WEBM_WEBM_CLUSTER_PARSER_H_
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