Remove 1024x1024 hack.
[dcpomatic.git] / src / wx / film_viewer.cc
1 /*
2     Copyright (C) 2012-2019 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 /** @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 #include "lib/dcpomatic_log.h"
48 extern "C" {
49 #include <libavutil/pixfmt.h>
50 }
51 #include <dcp/exceptions.h>
52 #include <wx/tglbtn.h>
53 #include <iostream>
54 #include <iomanip>
55
56 using std::string;
57 using std::pair;
58 using std::min;
59 using std::max;
60 using std::cout;
61 using std::list;
62 using std::bad_alloc;
63 using std::make_pair;
64 using std::exception;
65 using boost::shared_ptr;
66 using boost::dynamic_pointer_cast;
67 using boost::weak_ptr;
68 using boost::optional;
69 using dcp::Size;
70 using namespace dcpomatic;
71
72 static
73 int
74 rtaudio_callback (void* out, void *, unsigned int frames, double, RtAudioStreamStatus, void* data)
75 {
76         return reinterpret_cast<FilmViewer*>(data)->audio_callback (out, frames);
77 }
78
79 FilmViewer::FilmViewer (wxWindow* p)
80         : _gl_view (new GLView (p))
81         , _coalesce_player_changes (false)
82         , _audio (DCPOMATIC_RTAUDIO_API)
83         , _audio_channels (0)
84         , _audio_block_size (1024)
85         , _playing (false)
86         , _latency_history_count (0)
87         , _dropped (0)
88         , _closed_captions_dialog (new ClosedCaptionsDialog(p, this))
89         , _outline_content (false)
90         , _eyes (EYES_LEFT)
91         , _pad_black (false)
92 #ifdef DCPOMATIC_VARIANT_SWAROOP
93         , _in_watermark (false)
94         , _background_image (false)
95 #endif
96         , _state_timer ("viewer")
97         , _gets (0)
98 {
99         _timer.Bind  (wxEVT_TIMER, boost::bind (&FilmViewer::timer, this));
100
101         set_film (shared_ptr<Film> ());
102
103         _gl_view->Bind (wxEVT_SIZE, boost::bind(&FilmViewer::panel_sized, this, _1));
104
105         _config_changed_connection = Config::instance()->Changed.connect (bind (&FilmViewer::config_changed, this, _1));
106         config_changed (Config::SOUND_OUTPUT);
107 }
108
109 FilmViewer::~FilmViewer ()
110 {
111         stop ();
112 }
113
114 void
115 FilmViewer::set_film (shared_ptr<Film> film)
116 {
117         if (_film == film) {
118                 return;
119         }
120
121         _film = film;
122         _video_position = DCPTime ();
123         _player_video.first.reset ();
124         _player_video.second = DCPTime ();
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 (_gl_view, _("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, map, _audio_channels, bind(&PlayerVideo::force, _1, AV_PIX_FMT_RGB24), false, true));
196         if (!Config::instance()->sound() && !_audio.isStreamOpen()) {
197                 _butler->disable_audio ();
198         }
199
200         _closed_captions_dialog->set_film_and_butler (_film, _butler);
201
202         if (was_running) {
203                 start ();
204         }
205 }
206
207 void
208 FilmViewer::refresh_panel ()
209 {
210         /* XXX */
211 }
212
213 void
214 FilmViewer::get ()
215 {
216         DCPOMATIC_ASSERT (_butler);
217         ++_gets;
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                 _player_video.first->eyes() != EYES_BOTH
231                 );
232
233         _butler->rethrow ();
234
235         display_player_video ();
236 }
237
238 void
239 FilmViewer::display_player_video ()
240 {
241         if (!_player_video.first) {
242                 _frame.reset ();
243                 refresh_panel ();
244                 return;
245         }
246
247         if (_playing && (time() - _player_video.second) > one_video_frame()) {
248                 /* Too late; just drop this frame before we try to get its image (which will be the time-consuming
249                    part if this frame is J2K).
250                 */
251                 _video_position = _player_video.second;
252                 ++_dropped;
253                 return;
254         }
255
256         /* In an ideal world, what we would do here is:
257          *
258          * 1. convert to XYZ exactly as we do in the DCP creation path.
259          * 2. convert back to RGB for the preview display, compensating
260          *    for the monitor etc. etc.
261          *
262          * but this is inefficient if the source is RGB.  Since we don't
263          * (currently) care too much about the precise accuracy of the preview's
264          * colour mapping (and we care more about its speed) we try to short-
265          * circuit this "ideal" situation in some cases.
266          *
267          * The content's specified colour conversion indicates the colourspace
268          * which the content is in (according to the user).
269          *
270          * PlayerVideo::image (bound to PlayerVideo::force) will take the source
271          * image and convert it (from whatever the user has said it is) to RGB.
272          */
273
274         _state_timer.set ("get image");
275         /* XXX: do we need to store _frame? */
276         _frame = _player_video.first->image (bind(&PlayerVideo::force, _1, AV_PIX_FMT_RGB24), false, true);
277         _gl_view->set_image (_frame);
278
279         _state_timer.set ("ImageChanged");
280         ImageChanged (_player_video.first);
281         _state_timer.unset ();
282
283         _video_position = _player_video.second;
284         _inter_position = _player_video.first->inter_position ();
285         _inter_size = _player_video.first->inter_size ();
286
287         refresh_panel ();
288
289         _closed_captions_dialog->update (time());
290 }
291
292 void
293 FilmViewer::timer ()
294 {
295         if (!_film || !_playing) {
296                 return;
297         }
298
299         get ();
300         PositionChanged ();
301         DCPTime const next = _video_position + one_video_frame();
302
303         if (next >= _film->length()) {
304                 stop ();
305                 Finished ();
306                 return;
307         }
308
309         LOG_DEBUG_PLAYER("%1 -> %2; delay %3", next.seconds(), time().seconds(), max((next.seconds() - time().seconds()) * 1000, 1.0));
310         _timer.Start (max ((next.seconds() - time().seconds()) * 1000, 1.0), wxTIMER_ONE_SHOT);
311
312         if (_butler) {
313                 _butler->rethrow ();
314         }
315 }
316
317 bool
318 #ifdef DCPOMATIC_VARIANT_SWAROOP
319 FilmViewer::maybe_draw_background_image (wxPaintDC& dc)
320 {
321         XXX
322         optional<boost::filesystem::path> bg = Config::instance()->player_background_image();
323         if (bg) {
324                 wxImage image (std_to_wx(bg->string()));
325                 wxBitmap bitmap (image);
326                 dc.DrawBitmap (bitmap, max(0, (_panel_size.width - image.GetSize().GetWidth()) / 2), max(0, (_panel_size.height - image.GetSize().GetHeight()) / 2));
327                 return true;
328         }
329
330         return false;
331 }
332 #else
333 FilmViewer::maybe_draw_background_image (wxPaintDC &)
334 {
335         return false;
336 }
337 #endif
338
339 #if 0
340 XXX
341 void
342 FilmViewer::paint_panel ()
343 {
344         _state_timer.set ("paint-panel");
345
346         wxPaintDC dc (_panel);
347
348 #ifdef DCPOMATIC_VARIANT_SWAROOP
349         if (_background_image) {
350                 dc.Clear ();
351                 maybe_draw_background_image (dc);
352                 _state_timer.unset ();
353                 return;
354         }
355 #endif
356
357         if (!_out_size.width || !_out_size.height || !_film || !_frame || _out_size != _frame->size()) {
358                 dc.Clear ();
359         } else {
360
361                 wxImage frame (_out_size.width, _out_size.height, _frame->data()[0], true);
362                 wxBitmap frame_bitmap (frame);
363                 dc.DrawBitmap (frame_bitmap, 0, max(0, (_panel_size.height - _out_size.height) / 2));
364
365 #ifdef DCPOMATIC_VARIANT_SWAROOP
366                 DCPTime const period = DCPTime::from_seconds(Config::instance()->player_watermark_period() * 60);
367                 int64_t n = _video_position.get() / period.get();
368                 DCPTime from(n * period.get());
369                 DCPTime to = from + DCPTime::from_seconds(Config::instance()->player_watermark_duration() / 1000.0);
370                 if (from <= _video_position && _video_position <= to) {
371                         if (!_in_watermark) {
372                                 _in_watermark = true;
373                                 _watermark_x = rand() % _panel_size.width;
374                                 _watermark_y = rand() % _panel_size.height;
375                         }
376                         dc.SetTextForeground(*wxWHITE);
377                         string wm = Config::instance()->player_watermark_theatre();
378                         boost::posix_time::ptime t = boost::posix_time::second_clock::local_time();
379                         wm += "\n" + boost::posix_time::to_iso_extended_string(t);
380                         dc.DrawText(std_to_wx(wm), _watermark_x, _watermark_y);
381                 } else {
382                         _in_watermark = false;
383                 }
384 #endif
385         }
386
387         if (_out_size.width < _panel_size.width) {
388                 /* XXX: these colours are right for GNOME; may need adjusting for other OS */
389                 wxPen   p (_pad_black ? wxColour(0, 0, 0) : wxColour(240, 240, 240));
390                 wxBrush b (_pad_black ? wxColour(0, 0, 0) : wxColour(240, 240, 240));
391                 dc.SetPen (p);
392                 dc.SetBrush (b);
393                 dc.DrawRectangle (_out_size.width, 0, _panel_size.width - _out_size.width, _panel_size.height);
394         }
395
396         if (_out_size.height < _panel_size.height) {
397                 wxPen   p (_pad_black ? wxColour(0, 0, 0) : wxColour(240, 240, 240));
398                 wxBrush b (_pad_black ? wxColour(0, 0, 0) : wxColour(240, 240, 240));
399                 dc.SetPen (p);
400                 dc.SetBrush (b);
401                 int const gap = (_panel_size.height - _out_size.height) / 2;
402                 dc.DrawRectangle (0, 0, _panel_size.width, gap);
403                 dc.DrawRectangle (0, gap + _out_size.height + 1, _panel_size.width, gap + 1);
404         }
405
406         if (_outline_content) {
407                 wxPen p (wxColour (255, 0, 0), 2);
408                 dc.SetPen (p);
409                 dc.SetBrush (*wxTRANSPARENT_BRUSH);
410                 dc.DrawRectangle (_inter_position.x, _inter_position.y + (_panel_size.height - _out_size.height) / 2, _inter_size.width, _inter_size.height);
411         }
412
413         _state_timer.unset ();
414 }
415 #endif
416
417 void
418 FilmViewer::set_outline_content (bool o)
419 {
420         _outline_content = o;
421         refresh_panel ();
422 }
423
424 void
425 FilmViewer::set_eyes (Eyes e)
426 {
427         _eyes = e;
428         slow_refresh ();
429 }
430
431 void
432 FilmViewer::panel_sized (wxSizeEvent& ev)
433 {
434         _panel_size.width = ev.GetSize().GetWidth();
435         _panel_size.height = ev.GetSize().GetHeight();
436
437         calculate_sizes ();
438         if (!quick_refresh()) {
439                 slow_refresh ();
440         }
441         PositionChanged ();
442 }
443
444 void
445 FilmViewer::calculate_sizes ()
446 {
447         if (!_film || !_player) {
448                 return;
449         }
450
451         Ratio const * container = _film->container ();
452
453         float const view_ratio = float(_gl_view->GetSize().x) / _gl_view->GetSize().y;
454         float const film_ratio = container ? container->ratio () : 1.78;
455
456         if (view_ratio < film_ratio) {
457                 /* panel is less widscreen than the film; clamp width */
458                 _out_size.width = _gl_view->GetSize().x;
459                 _out_size.height = lrintf (_out_size.width / film_ratio);
460         } else {
461                 /* panel is more widescreen than the film; clamp height */
462                 _out_size.height = _gl_view->GetSize().y;
463                 _out_size.width = lrintf (_out_size.height * film_ratio);
464         }
465
466         /* Catch silly values */
467         _out_size.width = max (64, _out_size.width);
468         _out_size.height = max (64, _out_size.height);
469
470         /* OpenGL can't cope with sizes which aren't rounded up to the nearest 4 */
471         _out_size.width &= ~3;
472         _out_size.height &= ~3;
473
474         _player->set_video_container_size (_out_size);
475 }
476
477 void
478 FilmViewer::start ()
479 {
480         if (!_film) {
481                 return;
482         }
483
484         optional<bool> v = PlaybackPermitted ();
485         if (v && !*v) {
486                 /* Computer says no */
487                 return;
488         }
489
490         if (_audio.isStreamOpen()) {
491                 _audio.setStreamTime (_video_position.seconds());
492                 _audio.startStream ();
493         }
494
495         _playing = true;
496         _dropped = 0;
497         timer ();
498         Started (position());
499 }
500
501 bool
502 FilmViewer::stop ()
503 {
504         if (_audio.isStreamRunning()) {
505                 /* stop stream and discard any remaining queued samples */
506                 _audio.abortStream ();
507         }
508
509         if (!_playing) {
510                 return false;
511         }
512
513         _playing = false;
514         Stopped (position());
515         return true;
516 }
517
518 void
519 FilmViewer::player_change (ChangeType type, int property, bool frequent)
520 {
521         if (type != CHANGE_TYPE_DONE || frequent) {
522                 return;
523         }
524
525         if (_coalesce_player_changes) {
526                 _pending_player_changes.push_back (property);
527                 return;
528         }
529
530         calculate_sizes ();
531         bool refreshed = false;
532         if (
533                 property == VideoContentProperty::CROP ||
534                 property == VideoContentProperty::SCALE ||
535                 property == VideoContentProperty::FADE_IN ||
536                 property == VideoContentProperty::FADE_OUT ||
537                 property == VideoContentProperty::COLOUR_CONVERSION ||
538                 property == PlayerProperty::VIDEO_CONTAINER_SIZE ||
539                 property == PlayerProperty::FILM_CONTAINER
540                 ) {
541                 refreshed = quick_refresh ();
542         }
543
544         if (!refreshed) {
545                 slow_refresh ();
546         }
547         PositionChanged ();
548 }
549
550 void
551 FilmViewer::film_change (ChangeType type, Film::Property p)
552 {
553         if (type == CHANGE_TYPE_DONE && p == Film::AUDIO_CHANNELS) {
554                 recreate_butler ();
555         }
556 }
557
558 /** Re-get the current frame slowly by seeking */
559 void
560 FilmViewer::slow_refresh ()
561 {
562         seek (_video_position, true);
563 }
564
565 /** Try to re-get the current frame quickly by resetting the metadata
566  *  in the PlayerVideo that we used last time.
567  *  @return true if this was possible, false if not.
568  */
569 bool
570 FilmViewer::quick_refresh ()
571 {
572         if (!_player_video.first) {
573                 return false;
574         }
575
576         if (!_player_video.first->reset_metadata (_film, _player->video_container_size(), _film->frame_size())) {
577                 return false;
578         }
579
580         display_player_video ();
581         return true;
582 }
583
584 void
585 FilmViewer::seek (shared_ptr<Content> content, ContentTime t, bool accurate)
586 {
587         optional<DCPTime> dt = _player->content_time_to_dcp (content, t);
588         if (dt) {
589                 seek (*dt, accurate);
590         }
591 }
592
593 void
594 FilmViewer::set_coalesce_player_changes (bool c)
595 {
596         _coalesce_player_changes = c;
597
598         if (!c) {
599                 BOOST_FOREACH (int i, _pending_player_changes) {
600                         player_change (CHANGE_TYPE_DONE, i, false);
601                 }
602                 _pending_player_changes.clear ();
603         }
604 }
605
606 void
607 FilmViewer::seek (DCPTime t, bool accurate)
608 {
609         if (!_butler) {
610                 return;
611         }
612
613         if (t < DCPTime ()) {
614                 t = DCPTime ();
615         }
616
617         if (t >= _film->length ()) {
618                 t = _film->length ();
619         }
620
621         bool const was_running = stop ();
622
623         _closed_captions_dialog->clear ();
624         _butler->seek (t, accurate);
625         get ();
626
627         if (was_running) {
628                 start ();
629         }
630
631         PositionChanged ();
632 }
633
634 void
635 FilmViewer::config_changed (Config::Property p)
636 {
637 #ifdef DCPOMATIC_VARIANT_SWAROOP
638         if (p == Config::PLAYER_BACKGROUND_IMAGE) {
639                 refresh_panel ();
640                 return;
641         }
642 #endif
643
644         if (p != Config::SOUND && p != Config::SOUND_OUTPUT) {
645                 return;
646         }
647
648         if (_audio.isStreamOpen ()) {
649                 _audio.closeStream ();
650         }
651
652         if (Config::instance()->sound() && _audio.getDeviceCount() > 0) {
653                 unsigned int st = 0;
654                 if (Config::instance()->sound_output()) {
655                         while (st < _audio.getDeviceCount()) {
656                                 if (_audio.getDeviceInfo(st).name == Config::instance()->sound_output().get()) {
657                                         break;
658                                 }
659                                 ++st;
660                         }
661                         if (st == _audio.getDeviceCount()) {
662                                 st = _audio.getDefaultOutputDevice();
663                         }
664                 } else {
665                         st = _audio.getDefaultOutputDevice();
666                 }
667
668                 _audio_channels = _audio.getDeviceInfo(st).outputChannels;
669
670                 RtAudio::StreamParameters sp;
671                 sp.deviceId = st;
672                 sp.nChannels = _audio_channels;
673                 sp.firstChannel = 0;
674                 try {
675                         _audio.openStream (&sp, 0, RTAUDIO_FLOAT32, 48000, &_audio_block_size, &rtaudio_callback, this);
676 #ifdef DCPOMATIC_USE_RTERROR
677                 } catch (RtError& e) {
678 #else
679                 } catch (RtAudioError& e) {
680 #endif
681                         error_dialog (
682                                 _gl_view,
683                                 _("Could not set up audio output.  There will be no audio during the preview."), std_to_wx(e.what())
684                                 );
685                 }
686                 recreate_butler ();
687
688         } else {
689                 _audio_channels = 0;
690                 recreate_butler ();
691         }
692 }
693
694 DCPTime
695 FilmViewer::uncorrected_time () const
696 {
697         if (_audio.isStreamRunning ()) {
698                 return DCPTime::from_seconds (const_cast<RtAudio*>(&_audio)->getStreamTime());
699         }
700
701         return _video_position;
702 }
703
704 DCPTime
705 FilmViewer::time () const
706 {
707         if (_audio.isStreamRunning ()) {
708                 return DCPTime::from_seconds (const_cast<RtAudio*>(&_audio)->getStreamTime ()) -
709                         DCPTime::from_frames (average_latency(), _film->audio_frame_rate());
710         }
711
712         return _video_position;
713 }
714
715 int
716 FilmViewer::audio_callback (void* out_p, unsigned int frames)
717 {
718         while (true) {
719                 optional<DCPTime> t = _butler->get_audio (reinterpret_cast<float*> (out_p), frames);
720                 if (!t || DCPTime(uncorrected_time() - *t) < one_video_frame()) {
721                         /* There was an underrun or this audio is on time; carry on */
722                         break;
723                 }
724                 /* The audio we just got was (very) late; drop it and get some more. */
725         }
726
727         boost::mutex::scoped_lock lm (_latency_history_mutex, boost::try_to_lock);
728         if (lm) {
729                 _latency_history.push_back (_audio.getStreamLatency ());
730                 if (_latency_history.size() > static_cast<size_t> (_latency_history_count)) {
731                         _latency_history.pop_front ();
732                 }
733         }
734
735         return 0;
736 }
737
738 Frame
739 FilmViewer::average_latency () const
740 {
741         boost::mutex::scoped_lock lm (_latency_history_mutex);
742         if (_latency_history.empty()) {
743                 return 0;
744         }
745
746         Frame total = 0;
747         BOOST_FOREACH (Frame i, _latency_history) {
748                 total += i;
749         }
750
751         return total / _latency_history.size();
752 }
753
754 void
755 FilmViewer::set_dcp_decode_reduction (optional<int> reduction)
756 {
757         _dcp_decode_reduction = reduction;
758         if (_player) {
759                 _player->set_dcp_decode_reduction (reduction);
760         }
761 }
762
763 optional<int>
764 FilmViewer::dcp_decode_reduction () const
765 {
766         return _dcp_decode_reduction;
767 }
768
769 DCPTime
770 FilmViewer::one_video_frame () const
771 {
772         return DCPTime::from_frames (1, _film->video_frame_rate());
773 }
774
775 /** Open a dialog box showing our film's closed captions */
776 void
777 FilmViewer::show_closed_captions ()
778 {
779         _closed_captions_dialog->Show();
780 }
781
782 void
783 FilmViewer::seek_by (DCPTime by, bool accurate)
784 {
785         seek (_video_position + by, accurate);
786 }
787
788 void
789 FilmViewer::set_pad_black (bool p)
790 {
791         _pad_black = p;
792 }