Discard audio received before the time of the last accurate seek.
[dcpomatic.git] / src / lib / player.h
1 /*
2     Copyright (C) 2013-2015 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 #ifndef DCPOMATIC_PLAYER_H
22 #define DCPOMATIC_PLAYER_H
23
24 #include "player_subtitles.h"
25 #include "film.h"
26 #include "content.h"
27 #include "position_image.h"
28 #include "piece.h"
29 #include "content_video.h"
30 #include "content_audio.h"
31 #include "content_subtitle.h"
32 #include "audio_stream.h"
33 #include "audio_merger.h"
34 #include <boost/shared_ptr.hpp>
35 #include <boost/enable_shared_from_this.hpp>
36 #include <list>
37
38 namespace dcp {
39         class ReelAsset;
40 }
41
42 class PlayerVideo;
43 class Playlist;
44 class Font;
45 class AudioBuffers;
46 class ReferencedReelAsset;
47 class Resampler;
48
49 /** @class Player
50  *  @brief A class which can `play' a Playlist.
51  */
52 class Player : public boost::enable_shared_from_this<Player>, public boost::noncopyable
53 {
54 public:
55         Player (boost::shared_ptr<const Film>, boost::shared_ptr<const Playlist> playlist);
56
57         bool pass ();
58         void seek (DCPTime time, bool accurate);
59
60         std::list<boost::shared_ptr<Font> > get_subtitle_fonts ();
61         std::list<ReferencedReelAsset> get_reel_assets ();
62
63         void set_video_container_size (dcp::Size);
64         void set_ignore_video ();
65         void set_ignore_audio ();
66         void set_enable_subtitles (bool enable);
67         void set_always_burn_subtitles (bool burn);
68         void set_fast ();
69         void set_play_referenced ();
70
71         /** Emitted when something has changed such that if we went back and emitted
72          *  the last frame again it would look different.  This is not emitted after
73          *  a seek.
74          *
75          *  The parameter is true if these signals are currently likely to be frequent.
76          */
77         boost::signals2::signal<void (bool)> Changed;
78
79         boost::signals2::signal<void (boost::shared_ptr<PlayerVideo>, DCPTime)> Video;
80         boost::signals2::signal<void (boost::shared_ptr<AudioBuffers>, DCPTime)> Audio;
81         boost::signals2::signal<void (PlayerSubtitles, DCPTimePeriod)> Subtitle;
82
83 private:
84         friend class PlayerWrapper;
85         friend class Piece;
86         friend struct player_overlaps_test;
87         friend struct player_time_calculation_test1;
88         friend struct player_time_calculation_test2;
89         friend struct player_time_calculation_test3;
90
91         void setup_pieces ();
92         void flush ();
93         void film_changed (Film::Property);
94         void playlist_changed ();
95         void playlist_content_changed (boost::weak_ptr<Content>, int, bool);
96         std::list<PositionImage> transform_image_subtitles (std::list<ImageSubtitle>) const;
97         Frame dcp_to_content_video (boost::shared_ptr<const Piece> piece, DCPTime t) const;
98         DCPTime content_video_to_dcp (boost::shared_ptr<const Piece> piece, Frame f) const;
99         Frame dcp_to_resampled_audio (boost::shared_ptr<const Piece> piece, DCPTime t) const;
100         DCPTime resampled_audio_to_dcp (boost::shared_ptr<const Piece> piece, Frame f) const;
101         ContentTime dcp_to_content_time (boost::shared_ptr<const Piece> piece, DCPTime t) const;
102         DCPTime content_time_to_dcp (boost::shared_ptr<const Piece> piece, ContentTime t) const;
103         boost::shared_ptr<PlayerVideo> black_player_video_frame () const;
104         std::list<boost::shared_ptr<Piece> > overlaps (DCPTime from, DCPTime to, boost::function<bool (Content *)> valid);
105         void video (boost::weak_ptr<Piece>, ContentVideo);
106         void audio (boost::weak_ptr<Piece>, AudioStreamPtr, ContentAudio);
107         void image_subtitle (boost::weak_ptr<Piece>, ContentImageSubtitle);
108         void text_subtitle (boost::weak_ptr<Piece>, ContentTextSubtitle);
109         boost::shared_ptr<Resampler> resampler (boost::shared_ptr<const AudioContent> content, AudioStreamPtr stream, bool create);
110         DCPTime one_video_frame () const;
111         void fill_video (DCPTimePeriod period);
112         void fill_audio (DCPTimePeriod period);
113         void audio_flush (boost::shared_ptr<Piece>, AudioStreamPtr stream);
114         void audio_transform (boost::shared_ptr<AudioContent> content, AudioStreamPtr stream, ContentAudio content_audio, DCPTime time);
115         std::pair<boost::shared_ptr<AudioBuffers>, DCPTime> discard_audio (boost::shared_ptr<const AudioBuffers> audio, DCPTime time, DCPTime discard_to) const;
116
117         boost::shared_ptr<const Film> _film;
118         boost::shared_ptr<const Playlist> _playlist;
119
120         /** Our pieces are ready to go; if this is false the pieces must be (re-)created before they are used */
121         bool _have_valid_pieces;
122         std::list<boost::shared_ptr<Piece> > _pieces;
123
124         /** Size of the image in the DCP (e.g. 1990x1080 for flat) */
125         dcp::Size _video_container_size;
126         boost::shared_ptr<Image> _black_image;
127
128         /** true if the player should ignore all video; i.e. never produce any */
129         bool _ignore_video;
130         /** true if the player should ignore all audio; i.e. never produce any */
131         bool _ignore_audio;
132         /** true if the player should always burn subtitles into the video regardless
133             of content settings
134         */
135         bool _always_burn_subtitles;
136         /** true if we should try to be fast rather than high quality */
137         bool _fast;
138         /** true if we should `play' (i.e output) referenced DCP data (e.g. for preview) */
139         bool _play_referenced;
140
141         /** Last PlayerVideo that was emitted */
142         boost::shared_ptr<PlayerVideo> _last_video;
143         /** Time of the last video we emitted, or the last seek time */
144         boost::optional<DCPTime> _last_video_time;
145
146         AudioMerger _audio_merger;
147         boost::optional<DCPTime> _last_audio_time;
148
149         class StreamState {
150         public:
151                 StreamState () {}
152
153                 StreamState (boost::shared_ptr<Piece> p, DCPTime l)
154                         : piece(p)
155                         , last_push_end(l)
156                 {}
157
158                 boost::shared_ptr<Piece> piece;
159                 DCPTime last_push_end;
160         };
161         std::map<AudioStreamPtr, StreamState> _stream_states;
162
163         std::list<DCPTimePeriod> _no_video;
164         std::list<DCPTimePeriod> _no_audio;
165
166         std::list<std::pair<PlayerSubtitles, DCPTimePeriod> > _subtitles;
167
168         boost::shared_ptr<AudioProcessor> _audio_processor;
169         typedef std::map<std::pair<boost::shared_ptr<const AudioContent>, AudioStreamPtr>, boost::shared_ptr<Resampler> > ResamplerMap;
170         ResamplerMap _resamplers;
171
172         boost::signals2::scoped_connection _film_changed_connection;
173         boost::signals2::scoped_connection _playlist_changed_connection;
174         boost::signals2::scoped_connection _playlist_content_changed_connection;
175 };
176
177 #endif