99 lines
3.0 KiB
C
99 lines
3.0 KiB
C
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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef MEDIA_WEBM_WEBM_STREAM_PARSER_H_
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#define MEDIA_WEBM_WEBM_STREAM_PARSER_H_
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#include <map>
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#include "base/callback_forward.h"
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#include "base/memory/ref_counted.h"
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#include "media/base/audio_decoder_config.h"
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#include "media/base/buffers.h"
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#include "media/base/byte_queue.h"
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#include "media/base/stream_parser.h"
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#include "media/base/video_decoder_config.h"
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namespace media {
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class WebMClusterParser;
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class WebMStreamParser : public StreamParser {
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public:
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WebMStreamParser();
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virtual ~WebMStreamParser();
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// StreamParser implementation.
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virtual void Init(const InitCB& init_cb, const NewConfigCB& config_cb,
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const NewBuffersCB& new_buffers_cb,
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const NewTextBuffersCB& text_cb,
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const NeedKeyCB& need_key_cb,
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const AddTextTrackCB& add_text_track_cb,
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const NewMediaSegmentCB& new_segment_cb,
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const base::Closure& end_of_segment_cb,
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const LogCB& log_cb) OVERRIDE;
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virtual void Flush() OVERRIDE;
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virtual bool Parse(const uint8* buf, int size) OVERRIDE;
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private:
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enum State {
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kWaitingForInit,
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kParsingHeaders,
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kParsingClusters,
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kError
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};
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void ChangeState(State new_state);
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// Parses WebM Header, Info, Tracks elements. It also skips other level 1
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// elements that are not used right now. Once the Info & Tracks elements have
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// been parsed, this method will transition the parser from PARSING_HEADERS to
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// PARSING_CLUSTERS.
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//
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// Returns < 0 if the parse fails.
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// Returns 0 if more data is needed.
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// Returning > 0 indicates success & the number of bytes parsed.
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int ParseInfoAndTracks(const uint8* data, int size);
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// Incrementally parses WebM cluster elements. This method also skips
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// CUES elements if they are encountered since we currently don't use the
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// data in these elements.
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//
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// Returns < 0 if the parse fails.
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// Returns 0 if more data is needed.
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// Returning > 0 indicates success & the number of bytes parsed.
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int ParseCluster(const uint8* data, int size);
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// Fire needkey event through the |need_key_cb_|.
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void FireNeedKey(const std::string& key_id);
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State state_;
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InitCB init_cb_;
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NewConfigCB config_cb_;
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NewBuffersCB new_buffers_cb_;
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NewTextBuffersCB text_cb_;
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NeedKeyCB need_key_cb_;
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AddTextTrackCB add_text_track_cb_;
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typedef std::map<int, TextTrack* > TextTrackMap;
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TextTrackMap text_track_map_;
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NewMediaSegmentCB new_segment_cb_;
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base::Closure end_of_segment_cb_;
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LogCB log_cb_;
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// True if a new cluster id has been seen, but no audio or video buffers have
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// been parsed yet.
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bool waiting_for_buffers_;
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scoped_ptr<WebMClusterParser> cluster_parser_;
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ByteQueue byte_queue_;
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DISALLOW_COPY_AND_ASSIGN(WebMStreamParser);
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};
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} // namespace media
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#endif // MEDIA_WEBM_WEBM_STREAM_PARSER_H_
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