src/lib/ffmpeg_examiner.h

   1 /*
   2     Copyright (C) 2013-2017 Carl Hetherington <cth@carlh.net>
   3
   4     This file is part of DCP-o-matic.
   5
   6     DCP-o-matic is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     DCP-o-matic is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
  18
  19 */
  20
  21
  22 #include "ffmpeg.h"
  23 #include "video_examiner.h"
  24 #include <boost/optional.hpp>
  25
  26
  27 struct AVStream;
  28 class FFmpegAudioStream;
  29 class FFmpegSubtitleStream;
  30 class Job;
  31
  32
  33 class FFmpegExaminer : public FFmpeg, public VideoExaminer
  34 {
  35 public:
  36         FFmpegExaminer (std::shared_ptr<const FFmpegContent>, std::shared_ptr<Job> job = std::shared_ptr<Job>());
  37
  38         bool has_video () const;
  39
  40         boost::optional<double> video_frame_rate () const;
  41         dcp::Size video_size () const;
  42         Frame video_length () const;
  43         boost::optional<double> sample_aspect_ratio () const;
  44         bool yuv () const;
  45
  46         std::vector<std::shared_ptr<FFmpegSubtitleStream>> subtitle_streams () const {
  47                 return _subtitle_streams;
  48         }
  49
  50         std::vector<std::shared_ptr<FFmpegAudioStream>> audio_streams () const {
  51                 return _audio_streams;
  52         }
  53
  54         boost::optional<dcpomatic::ContentTime> first_video () const {
  55                 return _first_video;
  56         }
  57
  58         VideoRange range () const;
  59
  60         AVColorRange color_range () const {
  61                 return video_codec_context()->color_range;
  62         }
  63
  64         AVColorPrimaries color_primaries () const {
  65                 return video_codec_context()->color_primaries;
  66         }
  67
  68         AVColorTransferCharacteristic color_trc () const {
  69                 return video_codec_context()->color_trc;
  70         }
  71
  72         AVColorSpace colorspace () const {
  73                 return video_codec_context()->colorspace;
  74         }
  75
  76         boost::optional<int> bits_per_pixel () const;
  77
  78         boost::optional<double> rotation () const {
  79                 return _rotation;
  80         }
  81
  82         bool pulldown () const {
  83                 return _pulldown;
  84         }
  85
  86 private:
  87         bool video_packet (AVCodecContext* context, std::string& temporal_reference, AVPacket* packet);
  88         void audio_packet (AVCodecContext* context, std::shared_ptr<FFmpegAudioStream>, AVPacket* packet);
  89
  90         std::string stream_name (AVStream* s) const;
  91         std::string subtitle_stream_name (AVStream* s) const;
  92         boost::optional<dcpomatic::ContentTime> frame_time (AVStream* s) const;
  93
  94         std::vector<std::shared_ptr<FFmpegSubtitleStream>> _subtitle_streams;
  95         std::vector<std::shared_ptr<FFmpegAudioStream>> _audio_streams;
  96         boost::optional<dcpomatic::ContentTime> _first_video;
  97         /** Video length, either obtained from the header or derived by running
  98          *  through the whole file.
  99          */
 100         Frame _video_length;
 101         bool _need_video_length;
 102
 103         boost::optional<double> _rotation;
 104         bool _pulldown;
 105
 106         struct SubtitleStart
 107         {
 108                 SubtitleStart (std::string id_, bool image_, dcpomatic::ContentTime time_)
 109                         : id (id_)
 110                         , image (image_)
 111                         , time (time_)
 112                 {}
 113
 114                 std::string id;
 115                 /** true if it's an image subtitle, false for text */
 116                 bool image;
 117                 dcpomatic::ContentTime time;
 118         };
 119
 120         typedef std::map<std::shared_ptr<FFmpegSubtitleStream>, boost::optional<SubtitleStart>> LastSubtitleMap;
 121         LastSubtitleMap _last_subtitle_start;
 122 };