media/formats/webm/webm_tracks_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_TRACKS_PARSER_H_
   6 #define MEDIA_FORMATS_WEBM_WEBM_TRACKS_PARSER_H_
   7
   8 #include <map>
   9 #include <set>
  10 #include <string>
  11 #include <vector>
  12
  13 #include "base/compiler_specific.h"
  14 #include "base/memory/scoped_ptr.h"
  15 #include "base/time/time.h"
  16 #include "media/base/audio_decoder_config.h"
  17 #include "media/base/media_log.h"
  18 #include "media/base/text_track_config.h"
  19 #include "media/base/video_decoder_config.h"
  20 #include "media/formats/webm/webm_audio_client.h"
  21 #include "media/formats/webm/webm_content_encodings_client.h"
  22 #include "media/formats/webm/webm_parser.h"
  23 #include "media/formats/webm/webm_video_client.h"
  24
  25 namespace media {
  26
  27 // Parser for WebM Tracks element.
  28 class MEDIA_EXPORT WebMTracksParser : public WebMParserClient {
  29  public:
  30   explicit WebMTracksParser(const LogCB& log_cb, bool ignore_text_tracks);
  31   ~WebMTracksParser() override;
  32
  33   // Parses a WebM Tracks element in |buf|.
  34   //
  35   // Returns -1 if the parse fails.
  36   // Returns 0 if more data is needed.
  37   // Returns the number of bytes parsed on success.
  38   int Parse(const uint8* buf, int size);
  39
  40   int64 audio_track_num() const { return audio_track_num_; }
  41   int64 video_track_num() const { return video_track_num_; }
  42
  43   // If TrackEntry DefaultDuration field existed for the associated audio or
  44   // video track, returns that value converted from ns to base::TimeDelta with
  45   // precision not greater than |timecode_scale_in_us|. Defaults to
  46   // kNoTimestamp().
  47   base::TimeDelta GetAudioDefaultDuration(
  48       const double timecode_scale_in_us) const;
  49   base::TimeDelta GetVideoDefaultDuration(
  50       const double timecode_scale_in_us) const;
  51
  52   const std::set<int64>& ignored_tracks() const { return ignored_tracks_; }
  53
  54   const std::string& audio_encryption_key_id() const {
  55     return audio_encryption_key_id_;
  56   }
  57
  58   const AudioDecoderConfig& audio_decoder_config() {
  59     return audio_decoder_config_;
  60   }
  61
  62   const std::string& video_encryption_key_id() const {
  63     return video_encryption_key_id_;
  64   }
  65
  66   const VideoDecoderConfig& video_decoder_config() {
  67     return video_decoder_config_;
  68   }
  69
  70   typedef std::map<int, TextTrackConfig> TextTracks;
  71
  72   const TextTracks& text_tracks() const {
  73     return text_tracks_;
  74   }
  75
  76  private:
  77   // WebMParserClient implementation.
  78   WebMParserClient* OnListStart(int id) override;
  79   bool OnListEnd(int id) override;
  80   bool OnUInt(int id, int64 val) override;
  81   bool OnFloat(int id, double val) override;
  82   bool OnBinary(int id, const uint8* data, int size) override;
  83   bool OnString(int id, const std::string& str) override;
  84
  85   int64 track_type_;
  86   int64 track_num_;
  87   std::string track_name_;
  88   std::string track_language_;
  89   std::string codec_id_;
  90   std::vector<uint8> codec_private_;
  91   int64 seek_preroll_;
  92   int64 codec_delay_;
  93   int64 default_duration_;
  94   scoped_ptr<WebMContentEncodingsClient> track_content_encodings_client_;
  95
  96   int64 audio_track_num_;
  97   int64 audio_default_duration_;
  98   int64 video_track_num_;
  99   int64 video_default_duration_;
 100   bool ignore_text_tracks_;
 101   TextTracks text_tracks_;
 102   std::set<int64> ignored_tracks_;
 103   std::string audio_encryption_key_id_;
 104   std::string video_encryption_key_id_;
 105   LogCB log_cb_;
 106
 107   WebMAudioClient audio_client_;
 108   AudioDecoderConfig audio_decoder_config_;
 109
 110   WebMVideoClient video_client_;
 111   VideoDecoderConfig video_decoder_config_;
 112
 113   DISALLOW_COPY_AND_ASSIGN(WebMTracksParser);
 114 };
 115
 116 }  // namespace media
 117
 118 #endif  // MEDIA_FORMATS_WEBM_WEBM_TRACKS_PARSER_H_