src/lib/player.h

   1 /*
   2     Copyright (C) 2013-2019 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_text.h"
  25 #include "active_text.h"
  26 #include "content_text.h"
  27 #include "film.h"
  28 #include "content.h"
  29 #include "position_image.h"
  30 #include "piece.h"
  31 #include "content_video.h"
  32 #include "content_audio.h"
  33 #include "audio_stream.h"
  34 #include "audio_merger.h"
  35 #include "empty.h"
  36 #include <boost/shared_ptr.hpp>
  37 #include <boost/enable_shared_from_this.hpp>
  38 #include <boost/atomic.hpp>
  39 #include <list>
  40
  41 namespace dcp {
  42         class ReelAsset;
  43 }
  44
  45 namespace dcpomatic {
  46         class Font;
  47 }
  48
  49 class PlayerVideo;
  50 class Playlist;
  51 class AudioBuffers;
  52 class ReferencedReelAsset;
  53 class Shuffler;
  54
  55 class PlayerProperty
  56 {
  57 public:
  58         static int const VIDEO_CONTAINER_SIZE;
  59         static int const PLAYLIST;
  60         static int const FILM_CONTAINER;
  61         static int const FILM_VIDEO_FRAME_RATE;
  62         static int const DCP_DECODE_REDUCTION;
  63         static int const PLAYBACK_LENGTH;
  64 };
  65
  66 /** @class Player
  67  *  @brief A class which can play a Playlist.
  68  */
  69 class Player : public boost::enable_shared_from_this<Player>, public boost::noncopyable
  70 {
  71 public:
  72         Player (boost::shared_ptr<const Film>, boost::shared_ptr<const Playlist> playlist, dcpomatic::DCPTime playback_length);
  73         ~Player ();
  74
  75         bool pass ();
  76         void seek (dcpomatic::DCPTime time, bool accurate);
  77
  78         std::list<boost::shared_ptr<dcpomatic::Font> > get_subtitle_fonts ();
  79         std::list<ReferencedReelAsset> get_reel_assets ();
  80         dcp::Size video_container_size () const {
  81                 boost::mutex::scoped_lock lm (_mutex);
  82                 return _video_container_size;
  83         }
  84
  85         void set_playback_length (dcpomatic::DCPTime len);
  86         void set_video_container_size (dcp::Size);
  87         void set_ignore_video ();
  88         void set_ignore_audio ();
  89         void set_ignore_text ();
  90         void set_always_burn_open_subtitles ();
  91         void set_fast ();
  92         void set_play_referenced ();
  93         void set_dcp_decode_reduction (boost::optional<int> reduction);
  94
  95         boost::optional<dcpomatic::DCPTime> content_time_to_dcp (boost::shared_ptr<Content> content, dcpomatic::ContentTime t);
  96
  97         boost::signals2::signal<void (ChangeType, int, bool)> Change;
  98
  99         /** Emitted when a video frame is ready.  These emissions happen in the correct order. */
 100         boost::signals2::signal<void (boost::shared_ptr<PlayerVideo>, dcpomatic::DCPTime)> Video;
 101         boost::signals2::signal<void (boost::shared_ptr<AudioBuffers>, dcpomatic::DCPTime, int)> Audio;
 102         /** Emitted when a text is ready.  This signal may be emitted considerably
 103          *  after the corresponding Video.
 104          */
 105         boost::signals2::signal<void (PlayerText, TextType, boost::optional<DCPTextTrack>, dcpomatic::DCPTimePeriod)> Text;
 106
 107 private:
 108         friend class PlayerWrapper;
 109         friend class Piece;
 110         friend struct player_time_calculation_test1;
 111         friend struct player_time_calculation_test2;
 112         friend struct player_time_calculation_test3;
 113         friend struct player_subframe_test;
 114         friend struct empty_test1;
 115         friend struct empty_test2;
 116         friend struct check_reuse_old_data_test;
 117
 118         void setup_pieces ();
 119         void setup_pieces_unlocked ();
 120         void flush ();
 121         void film_change (ChangeType, Film::Property);
 122         void playlist_change (ChangeType);
 123         void playlist_content_change (ChangeType, int, bool);
 124         Frame dcp_to_content_video (boost::shared_ptr<const Piece> piece, dcpomatic::DCPTime t) const;
 125         dcpomatic::DCPTime content_video_to_dcp (boost::shared_ptr<const Piece> piece, Frame f) const;
 126         Frame dcp_to_resampled_audio (boost::shared_ptr<const Piece> piece, dcpomatic::DCPTime t) const;
 127         dcpomatic::DCPTime resampled_audio_to_dcp (boost::shared_ptr<const Piece> piece, Frame f) const;
 128         dcpomatic::ContentTime dcp_to_content_time (boost::shared_ptr<const Piece> piece, dcpomatic::DCPTime t) const;
 129         dcpomatic::DCPTime content_time_to_dcp (boost::shared_ptr<const Piece> piece, dcpomatic::ContentTime t) const;
 130         boost::shared_ptr<PlayerVideo> black_player_video_frame (Eyes eyes) const;
 131         void video (boost::weak_ptr<Piece>, ContentVideo);
 132         void audio (boost::weak_ptr<Piece>, AudioStreamPtr, ContentAudio);
 133         void bitmap_text_start (boost::weak_ptr<Piece>, boost::weak_ptr<const TextContent>, ContentBitmapText);
 134         void plain_text_start (boost::weak_ptr<Piece>, boost::weak_ptr<const TextContent>, ContentStringText);
 135         void subtitle_stop (boost::weak_ptr<Piece>, boost::weak_ptr<const TextContent>, dcpomatic::ContentTime);
 136         dcpomatic::DCPTime one_video_frame () const;
 137         void fill_audio (dcpomatic::DCPTimePeriod period);
 138         std::pair<boost::shared_ptr<AudioBuffers>, dcpomatic::DCPTime> discard_audio (
 139                 boost::shared_ptr<const AudioBuffers> audio, dcpomatic::DCPTime time, dcpomatic::DCPTime discard_to
 140                 ) const;
 141         boost::optional<PositionImage> open_subtitles_for_frame (dcpomatic::DCPTime time) const;
 142         void emit_video (boost::shared_ptr<PlayerVideo> pv, dcpomatic::DCPTime time);
 143         void do_emit_video (boost::shared_ptr<PlayerVideo> pv, dcpomatic::DCPTime time);
 144         void emit_audio (boost::shared_ptr<AudioBuffers> data, dcpomatic::DCPTime time);
 145         boost::shared_ptr<const Playlist> playlist () const;
 146
 147         /** Mutex to protect the whole Player state.  When it's used for the preview we have
 148             seek() and pass() called from the Butler thread and lots of other stuff called
 149             from the GUI thread.
 150         */
 151         mutable boost::mutex _mutex;
 152
 153         boost::shared_ptr<const Film> _film;
 154         boost::shared_ptr<const Playlist> _playlist;
 155
 156         /** > 0 if we are suspended (i.e. pass() and seek() do nothing) */
 157         boost::atomic<int> _suspended;
 158         std::list<boost::shared_ptr<Piece> > _pieces;
 159
 160         /** Size of the image in the DCP (e.g. 1990x1080 for flat) */
 161         dcp::Size _video_container_size;
 162         boost::shared_ptr<Image> _black_image;
 163
 164         /** true if the player should ignore all video; i.e. never produce any */
 165         bool _ignore_video;
 166         bool _ignore_audio;
 167         /** true if the player should ignore all text; i.e. never produce any */
 168         bool _ignore_text;
 169         bool _always_burn_open_subtitles;
 170         /** true if we should try to be fast rather than high quality */
 171         bool _fast;
 172         /** true if we should keep going in the face of `survivable' errors */
 173         bool _tolerant;
 174         /** true if we should `play' (i.e output) referenced DCP data (e.g. for preview) */
 175         bool _play_referenced;
 176
 177         /** Time just after the last video frame we emitted, or the time of the last accurate seek */
 178         boost::optional<dcpomatic::DCPTime> _last_video_time;
 179         boost::optional<Eyes> _last_video_eyes;
 180         /** Time just after the last audio frame we emitted, or the time of the last accurate seek */
 181         boost::optional<dcpomatic::DCPTime> _last_audio_time;
 182
 183         boost::optional<int> _dcp_decode_reduction;
 184
 185         typedef std::map<boost::weak_ptr<Piece>, boost::shared_ptr<PlayerVideo> > LastVideoMap;
 186         LastVideoMap _last_video;
 187
 188         AudioMerger _audio_merger;
 189         Shuffler* _shuffler;
 190         std::list<std::pair<boost::shared_ptr<PlayerVideo>, dcpomatic::DCPTime> > _delay;
 191
 192         class StreamState
 193         {
 194         public:
 195                 StreamState () {}
 196
 197                 StreamState (boost::shared_ptr<Piece> p, dcpomatic::DCPTime l)
 198                         : piece(p)
 199                         , last_push_end(l)
 200                 {}
 201
 202                 boost::shared_ptr<Piece> piece;
 203                 dcpomatic::DCPTime last_push_end;
 204         };
 205         std::map<AudioStreamPtr, StreamState> _stream_states;
 206
 207         Empty _black;
 208         Empty _silent;
 209
 210         ActiveText _active_texts[TEXT_COUNT];
 211         boost::shared_ptr<AudioProcessor> _audio_processor;
 212
 213         dcpomatic::DCPTime _playback_length;
 214
 215         boost::signals2::scoped_connection _film_changed_connection;
 216         boost::signals2::scoped_connection _playlist_change_connection;
 217         boost::signals2::scoped_connection _playlist_content_change_connection;
 218 };
 219
 220 #endif