src/lib/player.h

   1 /*
   2     Copyright (C) 2013-2014 Carl Hetherington <cth@carlh.net>
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17
  18 */
  19
  20 #ifndef DCPOMATIC_PLAYER_H
  21 #define DCPOMATIC_PLAYER_H
  22
  23 #include "playlist.h"
  24 #include "content.h"
  25 #include "film.h"
  26 #include "rect.h"
  27 #include "audio_content.h"
  28 #include "dcpomatic_time.h"
  29 #include "content_subtitle.h"
  30 #include "position_image.h"
  31 #include "piece.h"
  32 #include "content_video.h"
  33 #include "player_subtitles.h"
  34 #include <boost/shared_ptr.hpp>
  35 #include <boost/enable_shared_from_this.hpp>
  36 #include <list>
  37
  38 class Job;
  39 class Film;
  40 class Playlist;
  41 class AudioContent;
  42 class Piece;
  43 class Image;
  44 class Decoder;
  45 class Resampler;
  46 class PlayerVideo;
  47 class ImageProxy;
  48
  49 class PlayerStatistics
  50 {
  51 public:
  52         struct Video {
  53                 Video ()
  54                         : black (0)
  55                         , repeat (0)
  56                         , good (0)
  57                         , skip (0)
  58                 {}
  59
  60                 int black;
  61                 int repeat;
  62                 int good;
  63                 int skip;
  64         } video;
  65
  66         struct Audio {
  67                 Audio ()
  68                         : silence (0)
  69                         , good (0)
  70                         , skip (0)
  71                 {}
  72
  73                 DCPTime silence;
  74                 int64_t good;
  75                 int64_t skip;
  76         } audio;
  77
  78         void dump (boost::shared_ptr<Log>) const;
  79 };
  80
  81 /** @class Player
  82  *  @brief A class which can `play' a Playlist.
  83  */
  84 class Player : public boost::enable_shared_from_this<Player>, public boost::noncopyable
  85 {
  86 public:
  87         Player (boost::shared_ptr<const Film>, boost::shared_ptr<const Playlist>);
  88
  89         std::list<boost::shared_ptr<PlayerVideo> > get_video (DCPTime time, bool accurate);
  90         boost::shared_ptr<AudioBuffers> get_audio (DCPTime time, DCPTime length, bool accurate);
  91         PlayerSubtitles get_subtitles (DCPTime time, DCPTime length, bool starting);
  92         std::list<boost::shared_ptr<Font> > get_subtitle_fonts ();
  93
  94         void set_video_container_size (dcp::Size);
  95         void set_approximate_size ();
  96         void set_ignore_video ();
  97
  98         PlayerStatistics const & statistics () const;
  99
 100         /** Emitted when something has changed such that if we went back and emitted
 101          *  the last frame again it would look different.  This is not emitted after
 102          *  a seek.
 103          *
 104          *  The parameter is true if these signals are currently likely to be frequent.
 105          */
 106         boost::signals2::signal<void (bool)> Changed;
 107
 108 private:
 109         friend class PlayerWrapper;
 110         friend class Piece;
 111         friend struct player_overlaps_test;
 112
 113         void setup_pieces ();
 114         void playlist_changed ();
 115         void content_changed (boost::weak_ptr<Content>, int, bool);
 116         void flush ();
 117         void film_changed (Film::Property);
 118         std::list<PositionImage> transform_image_subtitles (std::list<ImageSubtitle>) const;
 119         void update_subtitle_from_text ();
 120         VideoFrame dcp_to_content_video (boost::shared_ptr<const Piece> piece, DCPTime t) const;
 121         DCPTime content_video_to_dcp (boost::shared_ptr<const Piece> piece, VideoFrame f) const;
 122         AudioFrame dcp_to_content_audio (boost::shared_ptr<const Piece> piece, DCPTime t) const;
 123         ContentTime dcp_to_content_subtitle (boost::shared_ptr<const Piece> piece, DCPTime t) const;
 124         boost::shared_ptr<PlayerVideo> black_player_video_frame (DCPTime) const;
 125
 126         /** @return Pieces of content type C that overlap a specified time range in the DCP */
 127         template<class C>
 128         std::list<boost::shared_ptr<Piece> >
 129         overlaps (DCPTime from, DCPTime to)
 130         {
 131                 if (!_have_valid_pieces) {
 132                         setup_pieces ();
 133                 }
 134
 135                 std::list<boost::shared_ptr<Piece> > overlaps;
 136                 for (typename std::list<boost::shared_ptr<Piece> >::const_iterator i = _pieces.begin(); i != _pieces.end(); ++i) {
 137                         if (!boost::dynamic_pointer_cast<C> ((*i)->content)) {
 138                                 continue;
 139                         }
 140
 141                         if ((*i)->content->position() <= to && (*i)->content->end() >= from) {
 142                                 overlaps.push_back (*i);
 143                         }
 144                 }
 145
 146                 return overlaps;
 147         }
 148
 149         boost::shared_ptr<const Film> _film;
 150         boost::shared_ptr<const Playlist> _playlist;
 151
 152         /** Our pieces are ready to go; if this is false the pieces must be (re-)created before they are used */
 153         bool _have_valid_pieces;
 154         std::list<boost::shared_ptr<Piece> > _pieces;
 155
 156         /** Size of the image in the DCP (e.g. 1990x1080 for flat) */
 157         dcp::Size _video_container_size;
 158         boost::shared_ptr<Image> _black_image;
 159
 160         bool _approximate_size;
 161         /** true if the player should ignore all video; i.e. never produce any */
 162         bool _ignore_video;
 163
 164         PlayerStatistics _statistics;
 165
 166         boost::signals2::scoped_connection _playlist_changed_connection;
 167         boost::signals2::scoped_connection _playlist_content_changed_connection;
 168         boost::signals2::scoped_connection _film_changed_connection;
 169 };
 170
 171 #endif