1 // Copyright 2014 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef MEDIA_FORMATS_WEBM_WEBM_STREAM_PARSER_H_ 6 #define MEDIA_FORMATS_WEBM_WEBM_STREAM_PARSER_H_ 7 8 #include "base/callback_forward.h" 9 #include "base/memory/ref_counted.h" 10 #include "media/base/audio_decoder_config.h" 11 #include "media/base/buffers.h" 12 #include "media/base/byte_queue.h" 13 #include "media/base/stream_parser.h" 14 #include "media/base/video_decoder_config.h" 15 16 namespace media { 17 18 class WebMClusterParser; 19 20 class WebMStreamParser : public StreamParser { 21 public: 22 WebMStreamParser(); 23 virtual ~WebMStreamParser(); 24 25 // StreamParser implementation. 26 virtual void Init(const InitCB& init_cb, const NewConfigCB& config_cb, 27 const NewBuffersCB& new_buffers_cb, 28 bool ignore_text_tracks, 29 const NeedKeyCB& need_key_cb, 30 const NewMediaSegmentCB& new_segment_cb, 31 const base::Closure& end_of_segment_cb, 32 const LogCB& log_cb) OVERRIDE; 33 virtual void Flush() OVERRIDE; 34 virtual bool Parse(const uint8* buf, int size) OVERRIDE; 35 36 private: 37 enum State { 38 kWaitingForInit, 39 kParsingHeaders, 40 kParsingClusters, 41 kError 42 }; 43 44 void ChangeState(State new_state); 45 46 // Parses WebM Header, Info, Tracks elements. It also skips other level 1 47 // elements that are not used right now. Once the Info & Tracks elements have 48 // been parsed, this method will transition the parser from PARSING_HEADERS to 49 // PARSING_CLUSTERS. 50 // 51 // Returns < 0 if the parse fails. 52 // Returns 0 if more data is needed. 53 // Returning > 0 indicates success & the number of bytes parsed. 54 int ParseInfoAndTracks(const uint8* data, int size); 55 56 // Incrementally parses WebM cluster elements. This method also skips 57 // CUES elements if they are encountered since we currently don't use the 58 // data in these elements. 59 // 60 // Returns < 0 if the parse fails. 61 // Returns 0 if more data is needed. 62 // Returning > 0 indicates success & the number of bytes parsed. 63 int ParseCluster(const uint8* data, int size); 64 65 // Fire needkey event through the |need_key_cb_|. 66 void FireNeedKey(const std::string& key_id); 67 68 State state_; 69 InitCB init_cb_; 70 NewConfigCB config_cb_; 71 NewBuffersCB new_buffers_cb_; 72 bool ignore_text_tracks_; 73 NeedKeyCB need_key_cb_; 74 75 NewMediaSegmentCB new_segment_cb_; 76 base::Closure end_of_segment_cb_; 77 LogCB log_cb_; 78 79 bool unknown_segment_size_; 80 81 scoped_ptr<WebMClusterParser> cluster_parser_; 82 ByteQueue byte_queue_; 83 84 DISALLOW_COPY_AND_ASSIGN(WebMStreamParser); 85 }; 86 87 } // namespace media 88 89 #endif // MEDIA_FORMATS_WEBM_WEBM_STREAM_PARSER_H_ 90