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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 <string>
#include "base/memory/scoped_ptr.h"
#include "media/base/media_export.h"
#include "media/base/stream_parser_buffer.h"
#include "media/webm/webm_parser.h"
namespace media {
class MEDIA_EXPORT WebMClusterParser : public WebMParserClient {
public:
typedef std::deque<scoped_refptr<StreamParserBuffer> > BufferQueue;
// Size is defined by the WebM encryption specification.
// http://wiki.webmproject.org/encryption/webm-encryption-rfc
static const int kIvSize = 8;
WebMClusterParser(int64 timecode_scale,
int audio_track_num,
int video_track_num,
const uint8* video_encryption_key_id,
int video_encryption_key_id_size);
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 true if the last Parse() call stopped at the end of a cluster.
bool cluster_ended() const { return cluster_ended_; }
private:
// Helper class that manages per-track state.
class Track {
public:
explicit Track(int track_num);
~Track();
int track_num() const { return track_num_; }
const BufferQueue& buffers() const { return buffers_; }
bool AddBuffer(const scoped_refptr<StreamParserBuffer>& buffer);
// Clears all buffer state.
void Reset();
private:
int track_num_;
BufferQueue buffers_;
};
// 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(const uint8* buf, int size, int duration);
bool OnBlock(int track_num, int timecode, int duration, int flags,
const uint8* data, int size);
double timecode_multiplier_; // Multiplier used to convert timecodes into
// microseconds.
scoped_array<uint8> video_encryption_key_id_;
int video_encryption_key_id_size_;
WebMListParser parser_;
int64 last_block_timecode_;
scoped_array<uint8> block_data_;
int block_data_size_;
int64 block_duration_;
int64 cluster_timecode_;
base::TimeDelta cluster_start_time_;
bool cluster_ended_;
Track audio_;
Track video_;
DISALLOW_IMPLICIT_CONSTRUCTORS(WebMClusterParser);
};
} // namespace media
#endif // MEDIA_WEBM_WEBM_CLUSTER_PARSER_H_
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