e515fced345bdd39a610e70c24c1a9383866663a
[dcpomatic.git] / 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 "content.h"
24 #include "film.h"
25 #include "rect.h"
26 #include "audio_content.h"
27 #include "dcpomatic_time.h"
28 #include "content_subtitle.h"
29 #include "position_image.h"
30 #include "piece.h"
31 #include "content_video.h"
32 #include "player_subtitles.h"
33 #include <boost/shared_ptr.hpp>
34 #include <boost/enable_shared_from_this.hpp>
35 #include <list>
36
37 class Job;
38 class Film;
39 class AudioContent;
40 class Piece;
41 class Image;
42 class Decoder;
43 class Resampler;
44 class PlayerVideo;
45 class ImageProxy;
46 class Font;
47  
48 class PlayerStatistics
49 {
50 public:
51         struct Video {
52                 Video ()
53                         : black (0)
54                         , repeat (0)
55                         , good (0)
56                         , skip (0)
57                 {}
58                 
59                 int black;
60                 int repeat;
61                 int good;
62                 int skip;
63         } video;
64
65         struct Audio {
66                 Audio ()
67                         : silence (0)
68                         , good (0)
69                         , skip (0)
70                 {}
71                 
72                 DCPTime silence;
73                 int64_t good;
74                 int64_t skip;
75         } audio;
76
77         void dump (boost::shared_ptr<Log>) const;
78 };
79
80 /** @class Player
81  *  @brief A class which can `play' a Film.
82  */
83 class Player : public boost::enable_shared_from_this<Player>, public boost::noncopyable
84 {
85 public:
86         Player (boost::shared_ptr<const Film>);
87
88         std::list<boost::shared_ptr<PlayerVideo> > get_video (DCPTime time, bool accurate);
89         boost::shared_ptr<AudioBuffers> get_audio (DCPTime time, DCPTime length, bool accurate);
90         PlayerSubtitles get_subtitles (DCPTime time, DCPTime length, bool starting);
91         std::list<boost::shared_ptr<Font> > get_subtitle_fonts ();
92
93         void set_video_container_size (dcp::Size);
94         void set_ignore_video ();
95         void set_enable_subtitles (bool enable);
96         void set_burn_subtitles (bool burn);
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 content_changed (boost::weak_ptr<Content>, int, bool);
115         void flush ();
116         void film_changed (Film::Property);
117         std::list<PositionImage> transform_image_subtitles (std::list<ImageSubtitle>) const;
118         void update_subtitle_from_text ();
119         Frame dcp_to_content_video (boost::shared_ptr<const Piece> piece, DCPTime t) const;
120         DCPTime content_video_to_dcp (boost::shared_ptr<const Piece> piece, Frame f) const;
121         Frame dcp_to_content_audio (boost::shared_ptr<const Piece> piece, DCPTime t) const;
122         ContentTime dcp_to_content_subtitle (boost::shared_ptr<const Piece> piece, DCPTime t) const;
123         boost::shared_ptr<PlayerVideo> black_player_video_frame (DCPTime) const;
124
125         /** @return Pieces of content type C that overlap a specified time range in the DCP */
126         template<class C>
127         std::list<boost::shared_ptr<Piece> >
128         overlaps (DCPTime from, DCPTime to)
129         {
130                 if (!_have_valid_pieces) {
131                         setup_pieces ();
132                 }
133
134                 std::list<boost::shared_ptr<Piece> > overlaps;
135                 for (typename std::list<boost::shared_ptr<Piece> >::const_iterator i = _pieces.begin(); i != _pieces.end(); ++i) {
136                         if (!boost::dynamic_pointer_cast<C> ((*i)->content)) {
137                                 continue;
138                         }
139
140                         if ((*i)->content->position() <= to && (*i)->content->end() >= from) {
141                                 overlaps.push_back (*i);
142                         }
143                 }
144                 
145                 return overlaps;
146         }
147         
148         boost::shared_ptr<const Film> _film;
149
150         /** Our pieces are ready to go; if this is false the pieces must be (re-)created before they are used */
151         bool _have_valid_pieces;
152         std::list<boost::shared_ptr<Piece> > _pieces;
153
154         /** Size of the image in the DCP (e.g. 1990x1080 for flat) */
155         dcp::Size _video_container_size;
156         boost::shared_ptr<Image> _black_image;
157
158         /** true if the player should ignore all video; i.e. never produce any */
159         bool _ignore_video;
160         /** true if the player should burn subtitles into the video */
161         bool _burn_subtitles;
162
163         boost::shared_ptr<AudioProcessor> _audio_processor;
164
165         PlayerStatistics _statistics;
166
167         boost::signals2::scoped_connection _film_content_changed_connection;
168         boost::signals2::scoped_connection _film_changed_connection;
169 };
170
171 #endif