src/wx/film_viewer.cc

   1 /*
   2     Copyright (C) 2012-2018 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 /** @file  src/film_viewer.cc
  22  *  @brief A wx widget to view a preview of a Film.
  23  */
  24
  25 #include "film_viewer.h"
  26 #include "playhead_to_timecode_dialog.h"
  27 #include "playhead_to_frame_dialog.h"
  28 #include "wx_util.h"
  29 #include "closed_captions_dialog.h"
  30 #include "lib/film.h"
  31 #include "lib/ratio.h"
  32 #include "lib/util.h"
  33 #include "lib/job_manager.h"
  34 #include "lib/image.h"
  35 #include "lib/exceptions.h"
  36 #include "lib/examine_content_job.h"
  37 #include "lib/filter.h"
  38 #include "lib/player.h"
  39 #include "lib/player_video.h"
  40 #include "lib/video_content.h"
  41 #include "lib/video_decoder.h"
  42 #include "lib/timer.h"
  43 #include "lib/butler.h"
  44 #include "lib/log.h"
  45 #include "lib/config.h"
  46 #include "lib/compose.hpp"
  47 extern "C" {
  48 #include <libavutil/pixfmt.h>
  49 }
  50 #include <dcp/exceptions.h>
  51 #include <wx/tglbtn.h>
  52 #include <iostream>
  53 #include <iomanip>
  54
  55 using std::string;
  56 using std::pair;
  57 using std::min;
  58 using std::max;
  59 using std::cout;
  60 using std::list;
  61 using std::bad_alloc;
  62 using std::make_pair;
  63 using std::exception;
  64 using boost::shared_ptr;
  65 using boost::dynamic_pointer_cast;
  66 using boost::weak_ptr;
  67 using boost::optional;
  68 using dcp::Size;
  69
  70 static
  71 int
  72 rtaudio_callback (void* out, void *, unsigned int frames, double, RtAudioStreamStatus, void* data)
  73 {
  74         return reinterpret_cast<FilmViewer*>(data)->audio_callback (out, frames);
  75 }
  76
  77 FilmViewer::FilmViewer (wxWindow* p)
  78         : _panel (new wxPanel (p))
  79         , _coalesce_player_changes (false)
  80         , _audio (DCPOMATIC_RTAUDIO_API)
  81         , _audio_channels (0)
  82         , _audio_block_size (1024)
  83         , _playing (false)
  84         , _latency_history_count (0)
  85         , _dropped (0)
  86         , _closed_captions_dialog (new ClosedCaptionsDialog(p))
  87         , _outline_content (false)
  88         , _eyes (EYES_LEFT)
  89 #ifdef DCPOMATIC_VARIANT_SWAROOP
  90         , _in_watermark (false)
  91 #endif
  92 {
  93 #ifndef __WXOSX__
  94         _panel->SetDoubleBuffered (true);
  95 #endif
  96
  97         _panel->SetBackgroundStyle (wxBG_STYLE_PAINT);
  98         _panel->SetBackgroundColour (*wxBLACK);
  99
 100         _panel->Bind (wxEVT_PAINT, boost::bind (&FilmViewer::paint_panel, this));
 101         _panel->Bind (wxEVT_SIZE,  boost::bind (&FilmViewer::panel_sized, this, _1));
 102         _timer.Bind  (wxEVT_TIMER, boost::bind (&FilmViewer::timer, this));
 103
 104         set_film (shared_ptr<Film> ());
 105
 106         _config_changed_connection = Config::instance()->Changed.connect (bind (&FilmViewer::config_changed, this, _1));
 107         config_changed (Config::SOUND_OUTPUT);
 108 }
 109
 110 FilmViewer::~FilmViewer ()
 111 {
 112         stop ();
 113 }
 114
 115 void
 116 FilmViewer::set_film (shared_ptr<Film> film)
 117 {
 118         if (_film == film) {
 119                 return;
 120         }
 121
 122         _film = film;
 123
 124         FilmChanged ();
 125
 126         _frame.reset ();
 127         _closed_captions_dialog->clear ();
 128
 129         if (!_film) {
 130                 _player.reset ();
 131                 recreate_butler ();
 132                 _frame.reset ();
 133                 refresh_panel ();
 134                 return;
 135         }
 136
 137         try {
 138                 _player.reset (new Player (_film, _film->playlist ()));
 139                 _player->set_fast ();
 140                 if (_dcp_decode_reduction) {
 141                         _player->set_dcp_decode_reduction (_dcp_decode_reduction);
 142                 }
 143         } catch (bad_alloc) {
 144                 error_dialog (_panel, _("There is not enough free memory to do that."));
 145                 _film.reset ();
 146                 return;
 147         }
 148
 149         _player->set_always_burn_open_subtitles ();
 150         _player->set_play_referenced ();
 151
 152         _film->Change.connect (boost::bind (&FilmViewer::film_change, this, _1, _2));
 153         _player->Change.connect (boost::bind (&FilmViewer::player_change, this, _1, _2, _3));
 154
 155         /* Keep about 1 second's worth of history samples */
 156         _latency_history_count = _film->audio_frame_rate() / _audio_block_size;
 157
 158         recreate_butler ();
 159
 160         calculate_sizes ();
 161         slow_refresh ();
 162 }
 163
 164 void
 165 FilmViewer::recreate_butler ()
 166 {
 167         bool const was_running = stop ();
 168         _butler.reset ();
 169
 170         if (!_film) {
 171                 return;
 172         }
 173
 174         AudioMapping map = AudioMapping (_film->audio_channels(), _audio_channels);
 175
 176         if (_audio_channels != 2 || _film->audio_channels() < 3) {
 177                 for (int i = 0; i < min (_film->audio_channels(), _audio_channels); ++i) {
 178                         map.set (i, i, 1);
 179                 }
 180         } else {
 181                 /* Special case: stereo output, at least 3 channel input.
 182                    Map so that Lt = L(-3dB) + Ls(-3dB) + C(-6dB) + Lfe(-10dB)
 183                                Rt = R(-3dB) + Rs(-3dB) + C(-6dB) + Lfe(-10dB)
 184                 */
 185                 map.set (dcp::LEFT,   0, 1 / sqrt(2)); // L -> Lt
 186                 map.set (dcp::RIGHT,  1, 1 / sqrt(2)); // R -> Rt
 187                 map.set (dcp::CENTRE, 0, 1 / 2.0); // C -> Lt
 188                 map.set (dcp::CENTRE, 1, 1 / 2.0); // C -> Rt
 189                 map.set (dcp::LFE,    0, 1 / sqrt(10)); // Lfe -> Lt
 190                 map.set (dcp::LFE,    1, 1 / sqrt(10)); // Lfe -> Rt
 191                 map.set (dcp::LS,     0, 1 / sqrt(2)); // Ls -> Lt
 192                 map.set (dcp::RS,     1, 1 / sqrt(2)); // Rs -> Rt
 193         }
 194
 195         _butler.reset (new Butler (_player, _film->log(), map, _audio_channels));
 196         if (!Config::instance()->sound() && !_audio.isStreamOpen()) {
 197                 _butler->disable_audio ();
 198         }
 199
 200         _closed_captions_dialog->set_butler (_butler);
 201
 202         if (was_running) {
 203                 start ();
 204         }
 205 }
 206
 207 void
 208 FilmViewer::refresh_panel ()
 209 {
 210         _panel->Refresh ();
 211         _panel->Update ();
 212 }
 213
 214 void
 215 FilmViewer::get ()
 216 {
 217         DCPOMATIC_ASSERT (_butler);
 218
 219         do {
 220                 Butler::Error e;
 221                 _player_video = _butler->get_video (&e);
 222                 if (!_player_video.first && e == Butler::AGAIN) {
 223                         signal_manager->when_idle (boost::bind(&FilmViewer::get, this));
 224                         return;
 225                 }
 226         } while (
 227                 _player_video.first &&
 228                 _film->three_d() &&
 229                 (_eyes != _player_video.first->eyes())
 230                 );
 231
 232         _butler->rethrow ();
 233
 234         display_player_video ();
 235 }
 236
 237 void
 238 FilmViewer::display_player_video ()
 239 {
 240         if (!_player_video.first) {
 241                 _frame.reset ();
 242                 refresh_panel ();
 243                 return;
 244         }
 245
 246         if (_playing && (time() - _player_video.second) > one_video_frame()) {
 247                 /* Too late; just drop this frame before we try to get its image (which will be the time-consuming
 248                    part if this frame is J2K).
 249                 */
 250                 _video_position = _player_video.second;
 251                 ++_dropped;
 252                 return;
 253         }
 254
 255         /* In an ideal world, what we would do here is:
 256          *
 257          * 1. convert to XYZ exactly as we do in the DCP creation path.
 258          * 2. convert back to RGB for the preview display, compensating
 259          *    for the monitor etc. etc.
 260          *
 261          * but this is inefficient if the source is RGB.  Since we don't
 262          * (currently) care too much about the precise accuracy of the preview's
 263          * colour mapping (and we care more about its speed) we try to short-
 264          * circuit this "ideal" situation in some cases.
 265          *
 266          * The content's specified colour conversion indicates the colourspace
 267          * which the content is in (according to the user).
 268          *
 269          * PlayerVideo::image (bound to PlayerVideo::always_rgb) will take the source
 270          * image and convert it (from whatever the user has said it is) to RGB.
 271          */
 272
 273         _frame = _player_video.first->image (
 274                 optional<dcp::NoteHandler>(bind(&Log::dcp_log, _film->log().get(), _1, _2)),
 275                 bind (&PlayerVideo::always_rgb, _1),
 276                 false, true
 277                 );
 278
 279         ImageChanged (_player_video.first);
 280
 281         _video_position = _player_video.second;
 282         _inter_position = _player_video.first->inter_position ();
 283         _inter_size = _player_video.first->inter_size ();
 284
 285         refresh_panel ();
 286
 287         _closed_captions_dialog->update (time());
 288 }
 289
 290 void
 291 FilmViewer::timer ()
 292 {
 293         if (!_film || !_playing) {
 294                 return;
 295         }
 296
 297         get ();
 298         PositionChanged ();
 299         DCPTime const next = _video_position + one_video_frame();
 300
 301         if (next >= _film->length()) {
 302                 stop ();
 303         }
 304
 305         _timer.Start (max ((next.seconds() - time().seconds()) * 1000, 1.0), wxTIMER_ONE_SHOT);
 306
 307         if (_butler) {
 308                 _butler->rethrow ();
 309         }
 310 }
 311
 312 void
 313 FilmViewer::paint_panel ()
 314 {
 315         wxPaintDC dc (_panel);
 316
 317         if (!_frame || !_film || !_out_size.width || !_out_size.height || _out_size != _frame->size()) {
 318                 dc.Clear ();
 319 #ifdef DCPOMATIC_VARIANT_SWAROOP
 320                 optional<boost::filesystem::path> bg = Config::instance()->player_background_image();
 321                 if (bg) {
 322                         wxImage image (std_to_wx(bg->string()));
 323                         wxBitmap bitmap (image);
 324                         dc.DrawBitmap (bitmap, max(0, (_panel_size.width - image.GetSize().GetWidth()) / 2), max(0, (_panel_size.height - image.GetSize().GetHeight()) / 2));
 325                 }
 326 #endif
 327                 return;
 328         }
 329
 330         wxImage frame (_out_size.width, _out_size.height, _frame->data()[0], true);
 331         wxBitmap frame_bitmap (frame);
 332         dc.DrawBitmap (frame_bitmap, 0, max(0, (_panel_size.height - _out_size.height) / 2));
 333
 334 #ifdef DCPOMATIC_VARIANT_SWAROOP
 335         DCPTime const period = DCPTime::from_seconds(Config::instance()->player_watermark_period() * 60);
 336         int64_t n = _video_position.get() / period.get();
 337         DCPTime from(n * period.get());
 338         DCPTime to = from + DCPTime::from_seconds(Config::instance()->player_watermark_duration() / 1000.0);
 339         if (from <= _video_position && _video_position <= to) {
 340                 if (!_in_watermark) {
 341                         _in_watermark = true;
 342                         _watermark_x = rand() % _panel_size.width;
 343                         _watermark_y = rand() % _panel_size.height;
 344                 }
 345                 dc.SetTextForeground(*wxWHITE);
 346                 string wm = Config::instance()->player_watermark_theatre();
 347                 boost::posix_time::ptime t = boost::posix_time::second_clock::local_time();
 348                 wm += "\n" + boost::posix_time::to_iso_extended_string(t);
 349                 dc.DrawText(std_to_wx(wm), _watermark_x, _watermark_y);
 350         } else {
 351                 _in_watermark = false;
 352         }
 353 #endif
 354
 355         if (_out_size.width < _panel_size.width) {
 356                 /* XXX: these colours are right for GNOME; may need adjusting for other OS */
 357                 wxPen p (wxColour (240, 240, 240));
 358                 wxBrush b (wxColour (240, 240, 240));
 359                 dc.SetPen (p);
 360                 dc.SetBrush (b);
 361                 dc.DrawRectangle (_out_size.width, 0, _panel_size.width - _out_size.width, _panel_size.height);
 362         }
 363
 364         if (_out_size.height < _panel_size.height) {
 365                 wxPen p (wxColour (240, 240, 240));
 366                 wxBrush b (wxColour (240, 240, 240));
 367                 dc.SetPen (p);
 368                 dc.SetBrush (b);
 369                 int const gap = (_panel_size.height - _out_size.height) / 2;
 370                 dc.DrawRectangle (0, 0, _panel_size.width, gap);
 371                 dc.DrawRectangle (0, gap + _out_size.height + 1, _panel_size.width, gap);
 372         }
 373
 374         if (_outline_content) {
 375                 wxPen p (wxColour (255, 0, 0), 2);
 376                 dc.SetPen (p);
 377                 dc.SetBrush (*wxTRANSPARENT_BRUSH);
 378                 dc.DrawRectangle (_inter_position.x, _inter_position.y + (_panel_size.height - _out_size.height) / 2, _inter_size.width, _inter_size.height);
 379         }
 380 }
 381
 382 void
 383 FilmViewer::set_outline_content (bool o)
 384 {
 385         _outline_content = o;
 386         refresh_panel ();
 387 }
 388
 389 void
 390 FilmViewer::set_eyes (Eyes e)
 391 {
 392         _eyes = e;
 393         slow_refresh ();
 394 }
 395
 396 void
 397 FilmViewer::panel_sized (wxSizeEvent& ev)
 398 {
 399         _panel_size.width = ev.GetSize().GetWidth();
 400         _panel_size.height = ev.GetSize().GetHeight();
 401
 402         calculate_sizes ();
 403         if (!quick_refresh()) {
 404                 slow_refresh ();
 405         }
 406         PositionChanged ();
 407 }
 408
 409 void
 410 FilmViewer::calculate_sizes ()
 411 {
 412         if (!_film || !_player) {
 413                 return;
 414         }
 415
 416         Ratio const * container = _film->container ();
 417
 418         float const panel_ratio = _panel_size.ratio ();
 419         float const film_ratio = container ? container->ratio () : 1.78;
 420
 421         if (panel_ratio < film_ratio) {
 422                 /* panel is less widscreen than the film; clamp width */
 423                 _out_size.width = _panel_size.width;
 424                 _out_size.height = lrintf (_out_size.width / film_ratio);
 425         } else {
 426                 /* panel is more widescreen than the film; clamp height */
 427                 _out_size.height = _panel_size.height;
 428                 _out_size.width = lrintf (_out_size.height * film_ratio);
 429         }
 430
 431         /* Catch silly values */
 432         _out_size.width = max (64, _out_size.width);
 433         _out_size.height = max (64, _out_size.height);
 434
 435         _player->set_video_container_size (_out_size);
 436 }
 437
 438 void
 439 FilmViewer::start ()
 440 {
 441         if (!_film) {
 442                 return;
 443         }
 444
 445         optional<bool> v = PlaybackPermitted ();
 446         if (v && !*v) {
 447                 /* Computer says no */
 448                 return;
 449         }
 450
 451         if (_audio.isStreamOpen()) {
 452                 _audio.setStreamTime (_video_position.seconds());
 453                 _audio.startStream ();
 454         }
 455
 456         _playing = true;
 457         _dropped = 0;
 458         timer ();
 459         Started (position());
 460 }
 461
 462 bool
 463 FilmViewer::stop ()
 464 {
 465         if (_audio.isStreamRunning()) {
 466                 /* stop stream and discard any remaining queued samples */
 467                 _audio.abortStream ();
 468         }
 469
 470         if (!_playing) {
 471                 return false;
 472         }
 473
 474         _playing = false;
 475         Stopped (position());
 476         return true;
 477 }
 478
 479 void
 480 FilmViewer::player_change (ChangeType type, int property, bool frequent)
 481 {
 482         if (type != CHANGE_TYPE_DONE || frequent) {
 483                 return;
 484         }
 485
 486         if (_coalesce_player_changes) {
 487                 _pending_player_changes.push_back (property);
 488                 return;
 489         }
 490
 491         calculate_sizes ();
 492         bool refreshed = false;
 493         if (
 494                 property == VideoContentProperty::CROP ||
 495                 property == VideoContentProperty::SCALE ||
 496                 property == VideoContentProperty::FADE_IN ||
 497                 property == VideoContentProperty::FADE_OUT ||
 498                 property == VideoContentProperty::COLOUR_CONVERSION ||
 499                 property == PlayerProperty::VIDEO_CONTAINER_SIZE ||
 500                 property == PlayerProperty::FILM_CONTAINER
 501                 ) {
 502                 refreshed = quick_refresh ();
 503         }
 504
 505         if (!refreshed) {
 506                 slow_refresh ();
 507         }
 508         PositionChanged ();
 509 }
 510
 511 void
 512 FilmViewer::film_change (ChangeType type, Film::Property p)
 513 {
 514         if (type == CHANGE_TYPE_DONE && p == Film::AUDIO_CHANNELS) {
 515                 recreate_butler ();
 516         }
 517 }
 518
 519 /** Re-get the current frame slowly by seeking */
 520 void
 521 FilmViewer::slow_refresh ()
 522 {
 523         seek (_video_position, true);
 524 }
 525
 526 /** Try to re-get the current frame quickly by resetting the metadata
 527  *  in the PlayerVideo that we used last time.
 528  *  @return true if this was possible, false if not.
 529  */
 530 bool
 531 FilmViewer::quick_refresh ()
 532 {
 533         if (!_player_video.first) {
 534                 return false;
 535         }
 536
 537         if (!_player_video.first->reset_metadata (_player->video_container_size(), _film->frame_size())) {
 538                 return false;
 539         }
 540
 541         display_player_video ();
 542         return true;
 543 }
 544
 545 void
 546 FilmViewer::seek (shared_ptr<Content> content, ContentTime t, bool accurate)
 547 {
 548         optional<DCPTime> dt = _player->content_time_to_dcp (content, t);
 549         if (dt) {
 550                 seek (*dt, accurate);
 551         }
 552 }
 553
 554 void
 555 FilmViewer::set_coalesce_player_changes (bool c)
 556 {
 557         _coalesce_player_changes = c;
 558
 559         if (!c) {
 560                 BOOST_FOREACH (int i, _pending_player_changes) {
 561                         player_change (CHANGE_TYPE_DONE, i, false);
 562                 }
 563                 _pending_player_changes.clear ();
 564         }
 565 }
 566
 567 void
 568 FilmViewer::seek (DCPTime t, bool accurate)
 569 {
 570         if (!_butler) {
 571                 return;
 572         }
 573
 574         if (t < DCPTime ()) {
 575                 t = DCPTime ();
 576         }
 577
 578         if (t >= _film->length ()) {
 579                 t = _film->length ();
 580         }
 581
 582         bool const was_running = stop ();
 583
 584         _closed_captions_dialog->clear ();
 585         _butler->seek (t, accurate);
 586         get ();
 587
 588         if (was_running) {
 589                 start ();
 590         }
 591
 592         PositionChanged ();
 593         Seeked (position());
 594 }
 595
 596 void
 597 FilmViewer::config_changed (Config::Property p)
 598 {
 599 #ifdef DCPOMATIC_VARIANT_SWAROOP
 600         if (p == Config::PLAYER_BACKGROUND_IMAGE) {
 601                 refresh_panel ();
 602                 return;
 603         }
 604 #endif
 605
 606         if (p != Config::SOUND && p != Config::SOUND_OUTPUT) {
 607                 return;
 608         }
 609
 610         if (_audio.isStreamOpen ()) {
 611                 _audio.closeStream ();
 612         }
 613
 614         if (Config::instance()->sound() && _audio.getDeviceCount() > 0) {
 615                 unsigned int st = 0;
 616                 if (Config::instance()->sound_output()) {
 617                         while (st < _audio.getDeviceCount()) {
 618                                 if (_audio.getDeviceInfo(st).name == Config::instance()->sound_output().get()) {
 619                                         break;
 620                                 }
 621                                 ++st;
 622                         }
 623                         if (st == _audio.getDeviceCount()) {
 624                                 st = _audio.getDefaultOutputDevice();
 625                         }
 626                 } else {
 627                         st = _audio.getDefaultOutputDevice();
 628                 }
 629
 630                 _audio_channels = _audio.getDeviceInfo(st).outputChannels;
 631
 632                 RtAudio::StreamParameters sp;
 633                 sp.deviceId = st;
 634                 sp.nChannels = _audio_channels;
 635                 sp.firstChannel = 0;
 636                 try {
 637                         _audio.openStream (&sp, 0, RTAUDIO_FLOAT32, 48000, &_audio_block_size, &rtaudio_callback, this);
 638 #ifdef DCPOMATIC_USE_RTERROR
 639                 } catch (RtError& e) {
 640 #else
 641                 } catch (RtAudioError& e) {
 642 #endif
 643                         error_dialog (
 644                                 _panel,
 645                                 _("Could not set up audio output.  There will be no audio during the preview."), std_to_wx(e.what())
 646                                 );
 647                 }
 648                 recreate_butler ();
 649
 650         } else {
 651                 _audio_channels = 0;
 652                 recreate_butler ();
 653         }
 654 }
 655
 656 DCPTime
 657 FilmViewer::uncorrected_time () const
 658 {
 659         if (_audio.isStreamRunning ()) {
 660                 return DCPTime::from_seconds (const_cast<RtAudio*>(&_audio)->getStreamTime());
 661         }
 662
 663         return _video_position;
 664 }
 665
 666 DCPTime
 667 FilmViewer::time () const
 668 {
 669         if (_audio.isStreamRunning ()) {
 670                 return DCPTime::from_seconds (const_cast<RtAudio*>(&_audio)->getStreamTime ()) -
 671                         DCPTime::from_frames (average_latency(), _film->audio_frame_rate());
 672         }
 673
 674         return _video_position;
 675 }
 676
 677 int
 678 FilmViewer::audio_callback (void* out_p, unsigned int frames)
 679 {
 680         while (true) {
 681                 optional<DCPTime> t = _butler->get_audio (reinterpret_cast<float*> (out_p), frames);
 682                 if (!t || DCPTime(uncorrected_time() - *t) < one_video_frame()) {
 683                         /* There was an underrun or this audio is on time; carry on */
 684                         break;
 685                 }
 686                 /* The audio we just got was (very) late; drop it and get some more. */
 687         }
 688
 689         boost::mutex::scoped_lock lm (_latency_history_mutex, boost::try_to_lock);
 690         if (lm) {
 691                 _latency_history.push_back (_audio.getStreamLatency ());
 692                 if (_latency_history.size() > static_cast<size_t> (_latency_history_count)) {
 693                         _latency_history.pop_front ();
 694                 }
 695         }
 696
 697         return 0;
 698 }
 699
 700 Frame
 701 FilmViewer::average_latency () const
 702 {
 703         boost::mutex::scoped_lock lm (_latency_history_mutex);
 704         if (_latency_history.empty()) {
 705                 return 0;
 706         }
 707
 708         Frame total = 0;
 709         BOOST_FOREACH (Frame i, _latency_history) {
 710                 total += i;
 711         }
 712
 713         return total / _latency_history.size();
 714 }
 715
 716 void
 717 FilmViewer::set_dcp_decode_reduction (optional<int> reduction)
 718 {
 719         _dcp_decode_reduction = reduction;
 720         if (_player) {
 721                 _player->set_dcp_decode_reduction (reduction);
 722         }
 723 }
 724
 725 optional<int>
 726 FilmViewer::dcp_decode_reduction () const
 727 {
 728         return _dcp_decode_reduction;
 729 }
 730
 731 DCPTime
 732 FilmViewer::one_video_frame () const
 733 {
 734         return DCPTime::from_frames (1, _film->video_frame_rate());
 735 }
 736
 737 /** Open a dialog box showing our film's closed captions */
 738 void
 739 FilmViewer::show_closed_captions ()
 740 {
 741         _closed_captions_dialog->Show();
 742 }
 743
 744 void
 745 FilmViewer::seek_by (DCPTime by, bool accurate)
 746 {
 747         seek (_video_position + by, accurate);
 748 }