src/lib/player.h

   1 /*
   2     Copyright (C) 2013-2020 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
  22 #ifndef DCPOMATIC_PLAYER_H
  23 #define DCPOMATIC_PLAYER_H
  24
  25
  26 #include "active_text.h"
  27 #include "atmos_metadata.h"
  28 #include "audio_merger.h"
  29 #include "audio_stream.h"
  30 #include "content_atmos.h"
  31 #include "content_audio.h"
  32 #include "content_text.h"
  33 #include "content_video.h"
  34 #include "empty.h"
  35 #include "film.h"
  36 #include "image.h"
  37 #include "player_text.h"
  38 #include "position_image.h"
  39 #include "shuffler.h"
  40 #include <boost/atomic.hpp>
  41 #include <list>
  42
  43
  44 namespace dcp {
  45         class ReelAsset;
  46 }
  47
  48 class AtmosContent;
  49 class AudioBuffers;
  50 class Content;
  51 class PlayerVideo;
  52 class Playlist;
  53 class ReferencedReelAsset;
  54
  55
  56 class PlayerProperty
  57 {
  58 public:
  59         static int const VIDEO_CONTAINER_SIZE;
  60         static int const PLAYLIST;
  61         static int const FILM_CONTAINER;
  62         static int const FILM_VIDEO_FRAME_RATE;
  63         static int const DCP_DECODE_REDUCTION;
  64         static int const PLAYBACK_LENGTH;
  65 };
  66
  67
  68 /** @class Player
  69  *  @brief A class which can play a Playlist.
  70  */
  71 class Player : public std::enable_shared_from_this<Player>
  72 {
  73 public:
  74         Player (std::shared_ptr<const Film>, Image::Alignment subtitle_alignment);
  75         Player (std::shared_ptr<const Film>, std::shared_ptr<const Playlist> playlist);
  76
  77         Player (Player const& Player) = delete;
  78         Player& operator= (Player const& Player) = delete;
  79
  80         bool pass ();
  81         void seek (dcpomatic::DCPTime time, bool accurate);
  82
  83         std::vector<std::shared_ptr<dcpomatic::Font>> get_subtitle_fonts ();
  84
  85         dcp::Size video_container_size () const {
  86                 return _video_container_size;
  87         }
  88
  89         void set_video_container_size (dcp::Size);
  90         void set_ignore_video ();
  91         void set_ignore_audio ();
  92         void set_ignore_text ();
  93         void set_always_burn_open_subtitles ();
  94         void set_fast ();
  95         void set_play_referenced ();
  96         void set_dcp_decode_reduction (boost::optional<int> reduction);
  97
  98         boost::optional<dcpomatic::DCPTime> content_time_to_dcp (std::shared_ptr<const Content> content, dcpomatic::ContentTime t) const;
  99         boost::optional<dcpomatic::ContentTime> dcp_to_content_time (std::shared_ptr<const Content> content, dcpomatic::DCPTime t) const;
 100
 101         boost::signals2::signal<void (ChangeType, int, bool)> Change;
 102
 103         /** Emitted when a video frame is ready.  These emissions happen in the correct order. */
 104         boost::signals2::signal<void (std::shared_ptr<PlayerVideo>, dcpomatic::DCPTime)> Video;
 105         /** Emitted when audio data is ready.  First parameter is the audio data, second its time,
 106          *  third the frame rate.
 107          */
 108         boost::signals2::signal<void (std::shared_ptr<AudioBuffers>, dcpomatic::DCPTime, int)> Audio;
 109         /** Emitted when a text is ready.  This signal may be emitted considerably
 110          *  after the corresponding Video.
 111          */
 112         boost::signals2::signal<void (PlayerText, TextType, boost::optional<DCPTextTrack>, dcpomatic::DCPTimePeriod)> Text;
 113         boost::signals2::signal<void (std::shared_ptr<const dcp::AtmosFrame>, dcpomatic::DCPTime, AtmosMetadata)> Atmos;
 114
 115 private:
 116         friend class PlayerWrapper;
 117         friend class Piece;
 118         friend struct player_time_calculation_test1;
 119         friend struct player_time_calculation_test2;
 120         friend struct player_time_calculation_test3;
 121         friend struct player_subframe_test;
 122         friend struct empty_test1;
 123         friend struct empty_test2;
 124         friend struct check_reuse_old_data_test;
 125         friend struct overlap_video_test1;
 126
 127         void construct ();
 128         void setup_pieces ();
 129         void film_change (ChangeType, Film::Property);
 130         void playlist_change (ChangeType);
 131         void playlist_content_change (ChangeType, int, bool);
 132         Frame dcp_to_content_video (std::shared_ptr<const Piece> piece, dcpomatic::DCPTime t) const;
 133         dcpomatic::DCPTime content_video_to_dcp (std::shared_ptr<const Piece> piece, Frame f) const;
 134         Frame dcp_to_resampled_audio (std::shared_ptr<const Piece> piece, dcpomatic::DCPTime t) const;
 135         dcpomatic::DCPTime resampled_audio_to_dcp (std::shared_ptr<const Piece> piece, Frame f) const;
 136         dcpomatic::ContentTime dcp_to_content_time (std::shared_ptr<const Piece> piece, dcpomatic::DCPTime t) const;
 137         dcpomatic::DCPTime content_time_to_dcp (std::shared_ptr<const Piece> piece, dcpomatic::ContentTime t) const;
 138         std::shared_ptr<PlayerVideo> black_player_video_frame (Eyes eyes) const;
 139
 140         void video (std::weak_ptr<Piece>, ContentVideo);
 141         void audio (std::weak_ptr<Piece>, AudioStreamPtr, ContentAudio);
 142         void bitmap_text_start (std::weak_ptr<Piece>, std::weak_ptr<const TextContent>, ContentBitmapText);
 143         void plain_text_start (std::weak_ptr<Piece>, std::weak_ptr<const TextContent>, ContentStringText);
 144         void subtitle_stop (std::weak_ptr<Piece>, std::weak_ptr<const TextContent>, dcpomatic::ContentTime);
 145         void atmos (std::weak_ptr<Piece>, ContentAtmos);
 146
 147         dcpomatic::DCPTime one_video_frame () const;
 148         void fill_audio (dcpomatic::DCPTimePeriod period);
 149         std::pair<std::shared_ptr<AudioBuffers>, dcpomatic::DCPTime> discard_audio (
 150                 std::shared_ptr<const AudioBuffers> audio, dcpomatic::DCPTime time, dcpomatic::DCPTime discard_to
 151                 ) const;
 152         boost::optional<PositionImage> open_subtitles_for_frame (dcpomatic::DCPTime time) const;
 153         void emit_video (std::shared_ptr<PlayerVideo> pv, dcpomatic::DCPTime time);
 154         void do_emit_video (std::shared_ptr<PlayerVideo> pv, dcpomatic::DCPTime time);
 155         void emit_audio (std::shared_ptr<AudioBuffers> data, dcpomatic::DCPTime time);
 156         std::shared_ptr<const Playlist> playlist () const;
 157
 158         /** Mutex to protect the whole Player state.  When it's used for the preview we have
 159             seek() and pass() called from the Butler thread and lots of other stuff called
 160             from the GUI thread.
 161         */
 162         mutable boost::mutex _mutex;
 163
 164         std::shared_ptr<const Film> const _film;
 165         /** Playlist, or 0 if we are using the one from the _film */
 166         std::shared_ptr<const Playlist> const _playlist;
 167
 168         /** > 0 if we are suspended (i.e. pass() and seek() do nothing) */
 169         boost::atomic<int> _suspended;
 170         std::list<std::shared_ptr<Piece>> _pieces;
 171
 172         /** Size of the image we are rendering to; this may be the DCP frame size, or
 173          *  the size of preview in a window.
 174          */
 175         boost::atomic<dcp::Size> _video_container_size;
 176         /** Should be accessed using the std::atomic... methods */
 177         std::shared_ptr<Image> _black_image;
 178
 179         /** true if the player should ignore all video; i.e. never produce any */
 180         boost::atomic<bool> _ignore_video;
 181         boost::atomic<bool> _ignore_audio;
 182         /** true if the player should ignore all text; i.e. never produce any */
 183         boost::atomic<bool> _ignore_text;
 184         boost::atomic<bool> _always_burn_open_subtitles;
 185         /** true if we should try to be fast rather than high quality */
 186         boost::atomic<bool> _fast;
 187         /** true if we should keep going in the face of `survivable' errors */
 188         bool const _tolerant;
 189         /** true if we should `play' (i.e output) referenced DCP data (e.g. for preview) */
 190         boost::atomic<bool> _play_referenced;
 191
 192         /** Time of the next video that we will emit, or the time of the last accurate seek */
 193         boost::optional<dcpomatic::DCPTime> _next_video_time;
 194         /** Eyes of the next video that we will emit */
 195         boost::optional<Eyes> _next_video_eyes;
 196         /** Time of the next audio that we will emit, or the time of the last accurate seek */
 197         boost::optional<dcpomatic::DCPTime> _next_audio_time;
 198
 199         boost::atomic<boost::optional<int>> _dcp_decode_reduction;
 200
 201         typedef std::map<std::weak_ptr<Piece>, std::shared_ptr<PlayerVideo>, std::owner_less<std::weak_ptr<Piece>>> LastVideoMap;
 202         LastVideoMap _last_video;
 203
 204         AudioMerger _audio_merger;
 205         std::unique_ptr<Shuffler> _shuffler;
 206         std::list<std::pair<std::shared_ptr<PlayerVideo>, dcpomatic::DCPTime>> _delay;
 207
 208         class StreamState
 209         {
 210         public:
 211                 StreamState () {}
 212
 213                 StreamState (std::shared_ptr<Piece> p, dcpomatic::DCPTime l)
 214                         : piece(p)
 215                         , last_push_end(l)
 216                 {}
 217
 218                 std::shared_ptr<Piece> piece;
 219                 dcpomatic::DCPTime last_push_end;
 220         };
 221         std::map<AudioStreamPtr, StreamState> _stream_states;
 222
 223         Empty _black;
 224         Empty _silent;
 225
 226         ActiveText _active_texts[static_cast<int>(TextType::COUNT)];
 227         std::shared_ptr<AudioProcessor> _audio_processor;
 228
 229         boost::atomic<dcpomatic::DCPTime> _playback_length;
 230
 231         /** Alignment for subtitle images that we create */
 232         Image::Alignment const _subtitle_alignment = Image::Alignment::PADDED;
 233
 234         boost::signals2::scoped_connection _film_changed_connection;
 235         boost::signals2::scoped_connection _playlist_change_connection;
 236         boost::signals2::scoped_connection _playlist_content_change_connection;
 237 };
 238
 239
 240 #endif