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 <list>
  24 #include <boost/shared_ptr.hpp>
  25 #include <boost/enable_shared_from_this.hpp>
  26 #include "playlist.h"
  27 #include "content.h"
  28 #include "film.h"
  29 #include "rect.h"
  30 #include "audio_content.h"
  31 #include "dcpomatic_time.h"
  32 #include "content_subtitle.h"
  33 #include "position_image.h"
  34 #include "piece.h"
  35 #include "content_video.h"
  36
  37 class Job;
  38 class Film;
  39 class Playlist;
  40 class AudioContent;
  41 class Piece;
  42 class Image;
  43 class DCPVideo;
  44 class Decoder;
  45
  46 class PlayerStatistics
  47 {
  48 public:
  49         struct Video {
  50                 Video ()
  51                         : black (0)
  52                         , repeat (0)
  53                         , good (0)
  54                         , skip (0)
  55                 {}
  56
  57                 int black;
  58                 int repeat;
  59                 int good;
  60                 int skip;
  61         } video;
  62
  63         struct Audio {
  64                 Audio ()
  65                         : silence (0)
  66                         , good (0)
  67                         , skip (0)
  68                 {}
  69
  70                 DCPTime silence;
  71                 int64_t good;
  72                 int64_t skip;
  73         } audio;
  74
  75         void dump (boost::shared_ptr<Log>) const;
  76 };
  77
  78 /** A wrapper for an Image which contains some pending operations; these may
  79  *  not be necessary if the receiver of the PlayerImage throws it away.
  80  */
  81 class PlayerImage
  82 {
  83 public:
  84         PlayerImage (boost::shared_ptr<const Image>, Crop, dcp::Size, dcp::Size, Scaler const *);
  85
  86         void set_subtitle (boost::shared_ptr<const Image>, Position<int>);
  87
  88         boost::shared_ptr<Image> image ();
  89
  90 private:
  91         boost::shared_ptr<const Image> _in;
  92         Crop _crop;
  93         dcp::Size _inter_size;
  94         dcp::Size _out_size;
  95         Scaler const * _scaler;
  96         boost::shared_ptr<const Image> _subtitle_image;
  97         Position<int> _subtitle_position;
  98 };
  99
 100 /** @class Player
 101  *  @brief A class which can `play' a Playlist.
 102  */
 103 class Player : public boost::enable_shared_from_this<Player>, public boost::noncopyable
 104 {
 105 public:
 106         Player (boost::shared_ptr<const Film>, boost::shared_ptr<const Playlist>);
 107
 108         std::list<boost::shared_ptr<DCPVideo> > get_video (DCPTime time, bool accurate);
 109         boost::shared_ptr<AudioBuffers> get_audio (DCPTime time, DCPTime length, bool accurate);
 110
 111         void set_video_container_size (dcp::Size);
 112         void set_approximate_size ();
 113         void set_burn_subtitles (bool burn) {
 114                 _burn_subtitles = burn;
 115         }
 116
 117         PlayerStatistics const & statistics () const;
 118
 119         /** Emitted when something has changed such that if we went back and emitted
 120          *  the last frame again it would look different.  This is not emitted after
 121          *  a seek.
 122          *
 123          *  The parameter is true if these signals are currently likely to be frequent.
 124          */
 125         boost::signals2::signal<void (bool)> Changed;
 126
 127 private:
 128         friend class PlayerWrapper;
 129         friend class Piece;
 130         friend class player_overlaps_test;
 131
 132         void setup_pieces ();
 133         void playlist_changed ();
 134         void content_changed (boost::weak_ptr<Content>, int, bool);
 135         void flush ();
 136         void film_changed (Film::Property);
 137         std::list<PositionImage> process_content_image_subtitles (
 138                 boost::shared_ptr<SubtitleContent>, std::list<boost::shared_ptr<ContentImageSubtitle> >
 139                 ) const;
 140         std::list<PositionImage> process_content_text_subtitles (std::list<boost::shared_ptr<ContentTextSubtitle> >) const;
 141         void update_subtitle_from_text ();
 142         VideoFrame dcp_to_content_video (boost::shared_ptr<const Piece> piece, DCPTime t) const;
 143         AudioFrame dcp_to_content_audio (boost::shared_ptr<const Piece> piece, DCPTime t) const;
 144         ContentTime dcp_to_content_subtitle (boost::shared_ptr<const Piece> piece, DCPTime t) const;
 145         boost::shared_ptr<DCPVideo> black_dcp_video (DCPTime) const;
 146         boost::shared_ptr<DCPVideo> content_to_dcp (
 147                 boost::shared_ptr<VideoContent> content,
 148                 ContentVideo content_video,
 149                 std::list<boost::shared_ptr<Piece> > subs,
 150                 DCPTime time,
 151                 dcp::Size image_size
 152                 ) const;
 153
 154         /** @return Pieces of content type C that overlap a specified time range in the DCP */
 155         template<class C>
 156         std::list<boost::shared_ptr<Piece> >
 157         overlaps (DCPTime from, DCPTime to)
 158         {
 159                 if (!_have_valid_pieces) {
 160                         setup_pieces ();
 161                 }
 162
 163                 std::list<boost::shared_ptr<Piece> > overlaps;
 164                 for (typename std::list<boost::shared_ptr<Piece> >::const_iterator i = _pieces.begin(); i != _pieces.end(); ++i) {
 165                         if (!boost::dynamic_pointer_cast<C> ((*i)->content)) {
 166                                 continue;
 167                         }
 168
 169                         if ((*i)->content->position() <= to && (*i)->content->end() >= from) {
 170                                 overlaps.push_back (*i);
 171                         }
 172                 }
 173
 174                 return overlaps;
 175         }
 176
 177         boost::shared_ptr<const Film> _film;
 178         boost::shared_ptr<const Playlist> _playlist;
 179
 180         /** Our pieces are ready to go; if this is false the pieces must be (re-)created before they are used */
 181         bool _have_valid_pieces;
 182         std::list<boost::shared_ptr<Piece> > _pieces;
 183
 184         dcp::Size _video_container_size;
 185         boost::shared_ptr<Image> _black_image;
 186
 187         bool _approximate_size;
 188         bool _burn_subtitles;
 189
 190         PlayerStatistics _statistics;
 191
 192         boost::signals2::scoped_connection _playlist_changed_connection;
 193         boost::signals2::scoped_connection _playlist_content_changed_connection;
 194         boost::signals2::scoped_connection _film_changed_connection;
 195 };
 196
 197 #endif