Back-end for very basic and hacky VF support for a DCP imported as content.
[dcpomatic.git] / src / lib / player.h
1 /*
2     Copyright (C) 2013-2015 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 "player_subtitles.h"
24 #include "film.h"
25 #include "content.h"
26 #include "position_image.h"
27 #include "piece.h"
28 #include <boost/shared_ptr.hpp>
29 #include <boost/enable_shared_from_this.hpp>
30 #include <list>
31
32 namespace dcp {
33         class ReelAsset;
34 }
35
36 class PlayerVideo;
37 class Playlist;
38 class Font;
39 class AudioBuffers;
40
41 /** @class Player
42  *  @brief A class which can `play' a Playlist.
43  */
44 class Player : public boost::enable_shared_from_this<Player>, public boost::noncopyable
45 {
46 public:
47         Player (boost::shared_ptr<const Film>, boost::shared_ptr<const Playlist> playlist);
48
49         std::list<boost::shared_ptr<PlayerVideo> > get_video (DCPTime time, bool accurate);
50         boost::shared_ptr<AudioBuffers> get_audio (DCPTime time, DCPTime length, bool accurate);
51         PlayerSubtitles get_subtitles (DCPTime time, DCPTime length, bool starting, bool burnt);
52         std::list<boost::shared_ptr<Font> > get_subtitle_fonts ();
53         std::list<boost::shared_ptr<dcp::ReelAsset> > get_reel_assets ();
54
55         void set_video_container_size (dcp::Size);
56         void set_ignore_video ();
57         void set_ignore_audio ();
58         void set_enable_subtitles (bool enable);
59         void set_always_burn_subtitles (bool burn);
60         void set_fast ();
61         void set_play_referenced ();
62
63         /** Emitted when something has changed such that if we went back and emitted
64          *  the last frame again it would look different.  This is not emitted after
65          *  a seek.
66          *
67          *  The parameter is true if these signals are currently likely to be frequent.
68          */
69         boost::signals2::signal<void (bool)> Changed;
70
71 private:
72         friend class PlayerWrapper;
73         friend class Piece;
74         friend struct player_overlaps_test;
75         friend struct player_time_calculation_test1;
76         friend struct player_time_calculation_test2;
77         friend struct player_time_calculation_test3;
78
79         void setup_pieces ();
80         void flush ();
81         void film_changed (Film::Property);
82         void playlist_changed ();
83         void playlist_content_changed (boost::weak_ptr<Content>, int, bool);
84         std::list<PositionImage> transform_image_subtitles (std::list<ImageSubtitle>) const;
85         void update_subtitle_from_text ();
86         Frame dcp_to_content_video (boost::shared_ptr<const Piece> piece, DCPTime t) const;
87         DCPTime content_video_to_dcp (boost::shared_ptr<const Piece> piece, Frame f) const;
88         Frame dcp_to_resampled_audio (boost::shared_ptr<const Piece> piece, DCPTime t) const;
89         ContentTime dcp_to_content_subtitle (boost::shared_ptr<const Piece> piece, DCPTime t) const;
90         boost::shared_ptr<PlayerVideo> black_player_video_frame (DCPTime) const;
91
92         /** @return Pieces of content type C that overlap a specified time range in the DCP */
93         template<class C>
94         std::list<boost::shared_ptr<Piece> >
95         overlaps (DCPTime from, DCPTime to)
96         {
97                 if (!_have_valid_pieces) {
98                         setup_pieces ();
99                 }
100
101                 std::list<boost::shared_ptr<Piece> > overlaps;
102                 for (typename std::list<boost::shared_ptr<Piece> >::const_iterator i = _pieces.begin(); i != _pieces.end(); ++i) {
103                         if (!boost::dynamic_pointer_cast<C> ((*i)->content)) {
104                                 continue;
105                         }
106
107                         if ((*i)->content->position() <= to && (*i)->content->end() >= from) {
108                                 overlaps.push_back (*i);
109                         }
110                 }
111
112                 return overlaps;
113         }
114
115         boost::shared_ptr<const Film> _film;
116         boost::shared_ptr<const Playlist> _playlist;
117
118         /** Our pieces are ready to go; if this is false the pieces must be (re-)created before they are used */
119         bool _have_valid_pieces;
120         std::list<boost::shared_ptr<Piece> > _pieces;
121
122         /** Size of the image in the DCP (e.g. 1990x1080 for flat) */
123         dcp::Size _video_container_size;
124         boost::shared_ptr<Image> _black_image;
125
126         /** true if the player should ignore all video; i.e. never produce any */
127         bool _ignore_video;
128         /** true if the player should ignore all audio; i.e. never produce any */
129         bool _ignore_audio;
130         /** true if the player should always burn subtitles into the video regardless
131             of content settings
132         */
133         bool _always_burn_subtitles;
134         /** true if we should try to be fast rather than high quality */
135         bool _fast;
136         /** true if we should `play' (i.e output) referenced DCP data (e.g. for preview) */
137         bool _play_referenced;
138
139         boost::shared_ptr<AudioProcessor> _audio_processor;
140
141         boost::signals2::scoped_connection _film_changed_connection;
142         boost::signals2::scoped_connection _playlist_changed_connection;
143         boost::signals2::scoped_connection _playlist_content_changed_connection;
144 };
145
146 #endif