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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_FORMATS_WEBM_WEBM_STREAM_PARSER_H_
#define MEDIA_FORMATS_WEBM_WEBM_STREAM_PARSER_H_
#include "base/callback_forward.h"
#include "base/memory/ref_counted.h"
#include "media/base/audio_decoder_config.h"
#include "media/base/buffers.h"
#include "media/base/byte_queue.h"
#include "media/base/stream_parser.h"
#include "media/base/video_decoder_config.h"
namespace media {
class WebMClusterParser;
class WebMStreamParser : public StreamParser {
public:
WebMStreamParser();
virtual ~WebMStreamParser();
// StreamParser implementation.
virtual void Init(const InitCB& init_cb, const NewConfigCB& config_cb,
const NewBuffersCB& new_buffers_cb,
bool ignore_text_tracks,
const NeedKeyCB& need_key_cb,
const NewMediaSegmentCB& new_segment_cb,
const base::Closure& end_of_segment_cb,
const LogCB& log_cb) OVERRIDE;
virtual void Flush() OVERRIDE;
virtual bool Parse(const uint8* buf, int size) OVERRIDE;
private:
enum State {
kWaitingForInit,
kParsingHeaders,
kParsingClusters,
kError
};
void ChangeState(State new_state);
// Parses WebM Header, Info, Tracks elements. It also skips other level 1
// elements that are not used right now. Once the Info & Tracks elements have
// been parsed, this method will transition the parser from PARSING_HEADERS to
// PARSING_CLUSTERS.
//
// Returns < 0 if the parse fails.
// Returns 0 if more data is needed.
// Returning > 0 indicates success & the number of bytes parsed.
int ParseInfoAndTracks(const uint8* data, int size);
// Incrementally parses WebM cluster elements. This method also skips
// CUES elements if they are encountered since we currently don't use the
// data in these elements.
//
// Returns < 0 if the parse fails.
// Returns 0 if more data is needed.
// Returning > 0 indicates success & the number of bytes parsed.
int ParseCluster(const uint8* data, int size);
// Fire needkey event through the |need_key_cb_|.
void FireNeedKey(const std::string& key_id);
State state_;
InitCB init_cb_;
NewConfigCB config_cb_;
NewBuffersCB new_buffers_cb_;
bool ignore_text_tracks_;
NeedKeyCB need_key_cb_;
NewMediaSegmentCB new_segment_cb_;
base::Closure end_of_segment_cb_;
LogCB log_cb_;
bool unknown_segment_size_;
scoped_ptr<WebMClusterParser> cluster_parser_;
ByteQueue byte_queue_;
DISALLOW_COPY_AND_ASSIGN(WebMStreamParser);
};
} // namespace media
#endif // MEDIA_FORMATS_WEBM_WEBM_STREAM_PARSER_H_
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