src/media/formats/webm/tracks_builder.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_TRACKS_BUILDER_H_
   6 #define MEDIA_FORMATS_WEBM_TRACKS_BUILDER_H_
   7
   8 #include <list>
   9 #include <string>
  10 #include <vector>
  11
  12 #include "base/basictypes.h"
  13
  14 namespace media {
  15
  16 class TracksBuilder {
  17  public:
  18   // If |allow_invalid_values| is false, some AddTrack() parameters will be
  19   // basically checked and will assert if out of valid range. |codec_id|,
  20   // |name|, |language| and any device-specific constraints are not checked.
  21   explicit TracksBuilder(bool allow_invalid_values);
  22   TracksBuilder();  // Sets |allow_invalid_values| to false.
  23   ~TracksBuilder();
  24
  25   // Only a non-negative |default_duration| will result in a serialized
  26   // kWebMIdDefaultDuration element. Note, 0 is allowed here for testing only
  27   // if |allow_invalid_values_| is true, since it is an illegal value for
  28   // DefaultDuration. Similar applies to |audio_channels|,
  29   // |audio_sampling_frequency|, |video_pixel_width| and |video_pixel_height|.
  30   void AddVideoTrack(int track_num,
  31                      uint64 track_uid,
  32                      const std::string& codec_id,
  33                      const std::string& name,
  34                      const std::string& language,
  35                      int default_duration,
  36                      int video_pixel_width,
  37                      int video_pixel_height);
  38   void AddAudioTrack(int track_num,
  39                      uint64 track_uid,
  40                      const std::string& codec_id,
  41                      const std::string& name,
  42                      const std::string& language,
  43                      int default_duration,
  44                      int audio_channels,
  45                      double audio_sampling_frequency);
  46   void AddTextTrack(int track_num,
  47                     uint64 track_uid,
  48                     const std::string& codec_id,
  49                     const std::string& name,
  50                     const std::string& language);
  51
  52   std::vector<uint8> Finish();
  53
  54  private:
  55   void AddTrackInternal(int track_num,
  56                         int track_type,
  57                         uint64 track_uid,
  58                         const std::string& codec_id,
  59                         const std::string& name,
  60                         const std::string& language,
  61                         int default_duration,
  62                         int video_pixel_width,
  63                         int video_pixel_height,
  64                         int audio_channels,
  65                         double audio_sampling_frequency);
  66   int GetTracksSize() const;
  67   int GetTracksPayloadSize() const;
  68   void WriteTracks(uint8* buffer, int buffer_size) const;
  69
  70   class Track {
  71    public:
  72     Track(int track_num,
  73           int track_type,
  74           uint64 track_uid,
  75           const std::string& codec_id,
  76           const std::string& name,
  77           const std::string& language,
  78           int default_duration,
  79           int video_pixel_width,
  80           int video_pixel_height,
  81           int audio_channels,
  82           double audio_sampling_frequency,
  83           bool allow_invalid_values);
  84
  85     int GetSize() const;
  86     void Write(uint8** buf, int* buf_size) const;
  87    private:
  88     int GetPayloadSize() const;
  89     int GetVideoPayloadSize() const;
  90     int GetAudioPayloadSize() const;
  91
  92     int track_num_;
  93     int track_type_;
  94     int track_uid_;
  95     std::string codec_id_;
  96     std::string name_;
  97     std::string language_;
  98     int default_duration_;
  99     int video_pixel_width_;
 100     int video_pixel_height_;
 101     int audio_channels_;
 102     double audio_sampling_frequency_;
 103   };
 104
 105   typedef std::list<Track> TrackList;
 106   TrackList tracks_;
 107   bool allow_invalid_values_;
 108
 109   DISALLOW_COPY_AND_ASSIGN(TracksBuilder);
 110 };
 111
 112 }  // namespace media
 113
 114 #endif  // MEDIA_FORMATS_WEBM_TRACKS_BUILDER_H_