media/formats/webm/webm_stream_parser.h

   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   ~WebMStreamParser() override;
  24
  25   // StreamParser implementation.
  26   void Init(const InitCB& init_cb,
  27             const NewConfigCB& config_cb,
  28             const NewBuffersCB& new_buffers_cb,
  29             bool ignore_text_tracks,
  30             const EncryptedMediaInitDataCB& encrypted_media_init_data_cb,
  31             const NewMediaSegmentCB& new_segment_cb,
  32             const base::Closure& end_of_segment_cb,
  33             const LogCB& log_cb) override;
  34   void Flush() override;
  35   bool Parse(const uint8* buf, int size) override;
  36
  37  private:
  38   enum State {
  39     kWaitingForInit,
  40     kParsingHeaders,
  41     kParsingClusters,
  42     kError
  43   };
  44
  45   void ChangeState(State new_state);
  46
  47   // Parses WebM Header, Info, Tracks elements. It also skips other level 1
  48   // elements that are not used right now. Once the Info & Tracks elements have
  49   // been parsed, this method will transition the parser from PARSING_HEADERS to
  50   // PARSING_CLUSTERS.
  51   //
  52   // Returns < 0 if the parse fails.
  53   // Returns 0 if more data is needed.
  54   // Returning > 0 indicates success & the number of bytes parsed.
  55   int ParseInfoAndTracks(const uint8* data, int size);
  56
  57   // Incrementally parses WebM cluster elements. This method also skips
  58   // CUES elements if they are encountered since we currently don't use the
  59   // data in these elements.
  60   //
  61   // Returns < 0 if the parse fails.
  62   // Returns 0 if more data is needed.
  63   // Returning > 0 indicates success & the number of bytes parsed.
  64   int ParseCluster(const uint8* data, int size);
  65
  66   // Fire needkey event through the |encrypted_media_init_data_cb_|.
  67   void OnEncryptedMediaInitData(const std::string& key_id);
  68
  69   State state_;
  70   InitCB init_cb_;
  71   NewConfigCB config_cb_;
  72   NewBuffersCB new_buffers_cb_;
  73   bool ignore_text_tracks_;
  74   EncryptedMediaInitDataCB encrypted_media_init_data_cb_;
  75
  76   NewMediaSegmentCB new_segment_cb_;
  77   base::Closure end_of_segment_cb_;
  78   LogCB log_cb_;
  79
  80   bool unknown_segment_size_;
  81
  82   scoped_ptr<WebMClusterParser> cluster_parser_;
  83   ByteQueue byte_queue_;
  84
  85   DISALLOW_COPY_AND_ASSIGN(WebMStreamParser);
  86 };
  87
  88 }  // namespace media
  89
  90 #endif  // MEDIA_FORMATS_WEBM_WEBM_STREAM_PARSER_H_