635a564c6558c241c04b62301203d7e8d5528a52
[dcpomatic.git] / src / wx / film_viewer.cc
1 /*
2     Copyright (C) 2012-2017 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 "lib/film.h"
30 #include "lib/ratio.h"
31 #include "lib/util.h"
32 #include "lib/job_manager.h"
33 #include "lib/image.h"
34 #include "lib/exceptions.h"
35 #include "lib/examine_content_job.h"
36 #include "lib/filter.h"
37 #include "lib/player.h"
38 #include "lib/player_video.h"
39 #include "lib/video_content.h"
40 #include "lib/video_decoder.h"
41 #include "lib/timer.h"
42 #include "lib/butler.h"
43 #include "lib/log.h"
44 #include "lib/config.h"
45 extern "C" {
46 #include <libavutil/pixfmt.h>
47 }
48 #include <dcp/exceptions.h>
49 #include <wx/tglbtn.h>
50 #include <iostream>
51 #include <iomanip>
52
53 using std::string;
54 using std::pair;
55 using std::min;
56 using std::max;
57 using std::cout;
58 using std::list;
59 using std::bad_alloc;
60 using std::make_pair;
61 using std::exception;
62 using boost::shared_ptr;
63 using boost::dynamic_pointer_cast;
64 using boost::weak_ptr;
65 using boost::optional;
66 using dcp::Size;
67
68 static
69 int
70 rtaudio_callback (void* out, void *, unsigned int frames, double, RtAudioStreamStatus, void* data)
71 {
72         return reinterpret_cast<FilmViewer*>(data)->audio_callback (out, frames);
73 }
74
75 FilmViewer::FilmViewer (wxWindow* p, bool outline_content, bool jump_to_selected)
76         : wxPanel (p)
77         , _panel (new wxPanel (this))
78         , _outline_content (0)
79         , _left_eye (new wxRadioButton (this, wxID_ANY, _("Left eye"), wxDefaultPosition, wxDefaultSize, wxRB_GROUP))
80         , _right_eye (new wxRadioButton (this, wxID_ANY, _("Right eye")))
81         , _jump_to_selected (0)
82         , _slider (new wxSlider (this, wxID_ANY, 0, 0, 4096))
83         , _rewind_button (new wxButton (this, wxID_ANY, wxT("|<")))
84         , _back_button (new wxButton (this, wxID_ANY, wxT("<")))
85         , _forward_button (new wxButton (this, wxID_ANY, wxT(">")))
86         , _frame_number (new wxStaticText (this, wxID_ANY, wxT("")))
87         , _timecode (new wxStaticText (this, wxID_ANY, wxT("")))
88         , _play_button (new wxToggleButton (this, wxID_ANY, _("Play")))
89         , _coalesce_player_changes (false)
90         , _slider_being_moved (false)
91         , _was_running_before_slider (false)
92         , _audio (DCPOMATIC_RTAUDIO_API)
93         , _audio_channels (0)
94         , _audio_block_size (1024)
95         , _playing (false)
96         , _latency_history_count (0)
97         , _dropped (0)
98 {
99 #ifndef __WXOSX__
100         _panel->SetDoubleBuffered (true);
101 #endif
102
103         _panel->SetBackgroundStyle (wxBG_STYLE_PAINT);
104
105         _v_sizer = new wxBoxSizer (wxVERTICAL);
106         SetSizer (_v_sizer);
107
108         _v_sizer->Add (_panel, 1, wxEXPAND);
109
110         wxBoxSizer* view_options = new wxBoxSizer (wxHORIZONTAL);
111         if (outline_content) {
112                 _outline_content = new wxCheckBox (this, wxID_ANY, _("Outline content"));
113                 view_options->Add (_outline_content, 0, wxRIGHT, DCPOMATIC_SIZER_GAP);
114         }
115         view_options->Add (_left_eye, 0, wxLEFT | wxRIGHT, DCPOMATIC_SIZER_GAP);
116         view_options->Add (_right_eye, 0, wxLEFT | wxRIGHT, DCPOMATIC_SIZER_GAP);
117         if (jump_to_selected) {
118                 _jump_to_selected = new wxCheckBox (this, wxID_ANY, _("Jump to selected content"));
119                 view_options->Add (_jump_to_selected, 0, wxLEFT | wxRIGHT, DCPOMATIC_SIZER_GAP);
120         }
121         _v_sizer->Add (view_options, 0, wxALL, DCPOMATIC_SIZER_GAP);
122
123         wxBoxSizer* h_sizer = new wxBoxSizer (wxHORIZONTAL);
124
125         wxBoxSizer* time_sizer = new wxBoxSizer (wxVERTICAL);
126         time_sizer->Add (_frame_number, 0, wxEXPAND);
127         time_sizer->Add (_timecode, 0, wxEXPAND);
128
129         h_sizer->Add (_rewind_button, 0, wxALL, 2);
130         h_sizer->Add (_back_button, 0, wxALL, 2);
131         h_sizer->Add (time_sizer, 0, wxEXPAND);
132         h_sizer->Add (_forward_button, 0, wxALL, 2);
133         h_sizer->Add (_play_button, 0, wxEXPAND);
134         h_sizer->Add (_slider, 1, wxEXPAND);
135
136         _v_sizer->Add (h_sizer, 0, wxEXPAND | wxALL, 6);
137
138         _frame_number->SetMinSize (wxSize (84, -1));
139         _rewind_button->SetMinSize (wxSize (32, -1));
140         _back_button->SetMinSize (wxSize (32, -1));
141         _forward_button->SetMinSize (wxSize (32, -1));
142
143         _panel->Bind            (wxEVT_PAINT,             boost::bind (&FilmViewer::paint_panel,     this));
144         _panel->Bind            (wxEVT_SIZE,              boost::bind (&FilmViewer::panel_sized,     this, _1));
145         if (_outline_content) {
146                 _outline_content->Bind  (wxEVT_CHECKBOX, boost::bind (&FilmViewer::refresh_panel,   this));
147         }
148         _left_eye->Bind         (wxEVT_RADIOBUTTON,       boost::bind (&FilmViewer::slow_refresh,    this));
149         _right_eye->Bind        (wxEVT_RADIOBUTTON,       boost::bind (&FilmViewer::slow_refresh,    this));
150         _slider->Bind           (wxEVT_SCROLL_THUMBTRACK, boost::bind (&FilmViewer::slider_moved,    this, false));
151         _slider->Bind           (wxEVT_SCROLL_PAGEUP,     boost::bind (&FilmViewer::slider_moved,    this, true));
152         _slider->Bind           (wxEVT_SCROLL_PAGEDOWN,   boost::bind (&FilmViewer::slider_moved,    this, true));
153         _slider->Bind           (wxEVT_SCROLL_THUMBRELEASE, boost::bind (&FilmViewer::slider_released, this));
154         _play_button->Bind      (wxEVT_TOGGLEBUTTON,      boost::bind (&FilmViewer::play_clicked,    this));
155         _timer.Bind             (wxEVT_TIMER,             boost::bind (&FilmViewer::timer,           this));
156         _rewind_button->Bind    (wxEVT_LEFT_DOWN,         boost::bind (&FilmViewer::rewind_clicked,  this, _1));
157         _back_button->Bind      (wxEVT_LEFT_DOWN,         boost::bind (&FilmViewer::back_clicked,    this, _1));
158         _forward_button->Bind   (wxEVT_LEFT_DOWN,         boost::bind (&FilmViewer::forward_clicked, this, _1));
159         _frame_number->Bind     (wxEVT_LEFT_DOWN,         boost::bind (&FilmViewer::frame_number_clicked, this));
160         _timecode->Bind         (wxEVT_LEFT_DOWN,         boost::bind (&FilmViewer::timecode_clicked, this));
161         if (_jump_to_selected) {
162                 _jump_to_selected->Bind (wxEVT_CHECKBOX, boost::bind (&FilmViewer::jump_to_selected_clicked, this));
163                 _jump_to_selected->SetValue (Config::instance()->jump_to_selected ());
164         }
165
166         set_film (shared_ptr<Film> ());
167
168         JobManager::instance()->ActiveJobsChanged.connect (
169                 bind (&FilmViewer::active_jobs_changed, this, _2)
170                 );
171
172         setup_sensitivity ();
173
174         _config_changed_connection = Config::instance()->Changed.connect (bind (&FilmViewer::config_changed, this, _1));
175         config_changed (Config::SOUND_OUTPUT);
176 }
177
178 FilmViewer::~FilmViewer ()
179 {
180         stop ();
181 }
182
183 void
184 FilmViewer::set_film (shared_ptr<Film> film)
185 {
186         if (_film == film) {
187                 return;
188         }
189
190         _film = film;
191
192         _frame.reset ();
193
194         update_position_slider ();
195         update_position_label ();
196
197         if (!_film) {
198                 _player.reset ();
199                 recreate_butler ();
200                 _frame.reset ();
201                 refresh_panel ();
202                 return;
203         }
204
205         try {
206                 _player.reset (new Player (_film, _film->playlist ()));
207                 _player->set_fast ();
208                 if (_dcp_decode_reduction) {
209                         _player->set_dcp_decode_reduction (_dcp_decode_reduction);
210                 }
211         } catch (bad_alloc) {
212                 error_dialog (this, _("There is not enough free memory to do that."));
213                 _film.reset ();
214                 return;
215         }
216
217         /* Always burn in subtitles, even if content is set not to, otherwise we won't see them
218            in the preview.
219         */
220         _player->set_always_burn_subtitles (true);
221         _player->set_play_referenced ();
222
223         _film->Changed.connect (boost::bind (&FilmViewer::film_changed, this, _1));
224         _player->Changed.connect (boost::bind (&FilmViewer::player_changed, this, _1, _2));
225
226         /* Keep about 1 second's worth of history samples */
227         _latency_history_count = _film->audio_frame_rate() / _audio_block_size;
228
229         recreate_butler ();
230
231         calculate_sizes ();
232         slow_refresh ();
233
234         setup_sensitivity ();
235 }
236
237 void
238 FilmViewer::recreate_butler ()
239 {
240         bool const was_running = stop ();
241         _butler.reset ();
242
243         if (!_film) {
244                 return;
245         }
246
247         AudioMapping map = AudioMapping (_film->audio_channels(), _audio_channels);
248
249         if (_audio_channels != 2 || _film->audio_channels() < 3) {
250                 for (int i = 0; i < min (_film->audio_channels(), _audio_channels); ++i) {
251                         map.set (i, i, 1);
252                 }
253         } else {
254                 /* Special case: stereo output, at least 3 channel input, map L+R to L/R and
255                    C to both, all 3dB down.
256                 */
257                 map.set (0, 0, 1 / sqrt(2)); // L -> L
258                 map.set (1, 1, 1 / sqrt(2)); // R -> R
259                 map.set (2, 0, 1 / sqrt(2)); // C -> L
260                 map.set (2, 1, 1 / sqrt(2)); // C -> R
261         }
262
263         _butler.reset (new Butler (_player, _film->log(), map, _audio_channels));
264         if (!Config::instance()->sound() && !_audio.isStreamOpen()) {
265                 _butler->disable_audio ();
266         }
267
268         if (was_running) {
269                 start ();
270         }
271 }
272
273 void
274 FilmViewer::refresh_panel ()
275 {
276         _panel->Refresh ();
277         _panel->Update ();
278 }
279
280 void
281 FilmViewer::get ()
282 {
283         DCPOMATIC_ASSERT (_butler);
284
285         do {
286                 _player_video = _butler->get_video ();
287         } while (
288                 _film->three_d() &&
289                 ((_left_eye->GetValue() && _player_video.first->eyes() == EYES_RIGHT) || (_right_eye->GetValue() && _player_video.first->eyes() == EYES_LEFT))
290                 );
291
292         _butler->rethrow ();
293
294         display_player_video ();
295 }
296
297 void
298 FilmViewer::display_player_video ()
299 {
300         if (!_player_video.first) {
301                 _frame.reset ();
302                 refresh_panel ();
303                 return;
304         }
305
306         if (_playing && (time() - _player_video.second) > one_video_frame()) {
307                 /* Too late; just drop this frame before we try to get its image (which will be the time-consuming
308                    part if this frame is J2K).
309                 */
310                 _video_position = _player_video.second;
311                 ++_dropped;
312                 return;
313         }
314
315         /* In an ideal world, what we would do here is:
316          *
317          * 1. convert to XYZ exactly as we do in the DCP creation path.
318          * 2. convert back to RGB for the preview display, compensating
319          *    for the monitor etc. etc.
320          *
321          * but this is inefficient if the source is RGB.  Since we don't
322          * (currently) care too much about the precise accuracy of the preview's
323          * colour mapping (and we care more about its speed) we try to short-
324          * circuit this "ideal" situation in some cases.
325          *
326          * The content's specified colour conversion indicates the colourspace
327          * which the content is in (according to the user).
328          *
329          * PlayerVideo::image (bound to PlayerVideo::always_rgb) will take the source
330          * image and convert it (from whatever the user has said it is) to RGB.
331          */
332
333         _frame = _player_video.first->image (
334                 bind (&Log::dcp_log, _film->log().get(), _1, _2),
335                 bind (&PlayerVideo::always_rgb, _1),
336                 false, true
337                 );
338
339         ImageChanged (_player_video.first);
340
341         _video_position = _player_video.second;
342         _inter_position = _player_video.first->inter_position ();
343         _inter_size = _player_video.first->inter_size ();
344
345         refresh_panel ();
346 }
347
348 void
349 FilmViewer::timer ()
350 {
351         if (!_film || !_playing) {
352                 return;
353         }
354
355         get ();
356         update_position_label ();
357         update_position_slider ();
358         DCPTime const next = _video_position + one_video_frame();
359
360         if (next >= _film->length()) {
361                 stop ();
362         }
363
364         _timer.Start (max ((next.seconds() - time().seconds()) * 1000, 1.0), wxTIMER_ONE_SHOT);
365
366         if (_butler) {
367                 _butler->rethrow ();
368         }
369 }
370
371 void
372 FilmViewer::paint_panel ()
373 {
374         wxPaintDC dc (_panel);
375
376         if (!_frame || !_film || !_out_size.width || !_out_size.height || _out_size != _frame->size()) {
377                 dc.Clear ();
378                 return;
379         }
380
381         wxImage frame (_out_size.width, _out_size.height, _frame->data()[0], true);
382         wxBitmap frame_bitmap (frame);
383         dc.DrawBitmap (frame_bitmap, 0, 0);
384
385         if (_out_size.width < _panel_size.width) {
386                 wxPen p (GetBackgroundColour ());
387                 wxBrush b (GetBackgroundColour ());
388                 dc.SetPen (p);
389                 dc.SetBrush (b);
390                 dc.DrawRectangle (_out_size.width, 0, _panel_size.width - _out_size.width, _panel_size.height);
391         }
392
393         if (_out_size.height < _panel_size.height) {
394                 wxPen p (GetBackgroundColour ());
395                 wxBrush b (GetBackgroundColour ());
396                 dc.SetPen (p);
397                 dc.SetBrush (b);
398                 dc.DrawRectangle (0, _out_size.height, _panel_size.width, _panel_size.height - _out_size.height);
399         }
400
401         if (_outline_content && _outline_content->GetValue ()) {
402                 wxPen p (wxColour (255, 0, 0), 2);
403                 dc.SetPen (p);
404                 dc.SetBrush (*wxTRANSPARENT_BRUSH);
405                 dc.DrawRectangle (_inter_position.x, _inter_position.y, _inter_size.width, _inter_size.height);
406         }
407 }
408
409 /** @param page true if this was a PAGEUP/PAGEDOWN event for which we won't receive a THUMBRELEASE */
410 void
411 FilmViewer::slider_moved (bool page)
412 {
413         if (!_film) {
414                 return;
415         }
416
417         if (!page && !_slider_being_moved) {
418                 /* This is the first event of a drag; stop playback for the duration of the drag */
419                 _was_running_before_slider = stop ();
420                 _slider_being_moved = true;
421         }
422
423         DCPTime t (_slider->GetValue() * _film->length().get() / 4096);
424         /* Ensure that we hit the end of the film at the end of the slider */
425         if (t >= _film->length ()) {
426                 t = _film->length() - one_video_frame();
427         }
428         seek (t, false);
429         update_position_label ();
430 }
431
432 void
433 FilmViewer::slider_released ()
434 {
435         if (_was_running_before_slider) {
436                 /* Restart after a drag */
437                 start ();
438         }
439         _slider_being_moved = false;
440 }
441
442 void
443 FilmViewer::panel_sized (wxSizeEvent& ev)
444 {
445         _panel_size.width = ev.GetSize().GetWidth();
446         _panel_size.height = ev.GetSize().GetHeight();
447
448         calculate_sizes ();
449         if (!quick_refresh()) {
450                 slow_refresh ();
451         }
452         update_position_label ();
453         update_position_slider ();
454 }
455
456 void
457 FilmViewer::calculate_sizes ()
458 {
459         if (!_film) {
460                 return;
461         }
462
463         Ratio const * container = _film->container ();
464
465         float const panel_ratio = _panel_size.ratio ();
466         float const film_ratio = container ? container->ratio () : 1.78;
467
468         if (panel_ratio < film_ratio) {
469                 /* panel is less widscreen than the film; clamp width */
470                 _out_size.width = _panel_size.width;
471                 _out_size.height = lrintf (_out_size.width / film_ratio);
472         } else {
473                 /* panel is more widescreen than the film; clamp height */
474                 _out_size.height = _panel_size.height;
475                 _out_size.width = lrintf (_out_size.height * film_ratio);
476         }
477
478         /* Catch silly values */
479         _out_size.width = max (64, _out_size.width);
480         _out_size.height = max (64, _out_size.height);
481
482         _player->set_video_container_size (_out_size);
483 }
484
485 void
486 FilmViewer::play_clicked ()
487 {
488         check_play_state ();
489 }
490
491 void
492 FilmViewer::check_play_state ()
493 {
494         if (!_film || _film->video_frame_rate() == 0) {
495                 return;
496         }
497
498         if (_play_button->GetValue()) {
499                 start ();
500         } else {
501                 stop ();
502         }
503 }
504
505 void
506 FilmViewer::start ()
507 {
508         if (!_film) {
509                 return;
510         }
511
512         if (_audio.isStreamOpen()) {
513                 _audio.setStreamTime (_video_position.seconds());
514                 _audio.startStream ();
515         }
516
517         _playing = true;
518         _dropped = 0;
519         timer ();
520         _play_button->SetValue (true);
521 }
522
523 bool
524 FilmViewer::stop ()
525 {
526         if (_audio.isStreamRunning()) {
527                 /* stop stream and discard any remaining queued samples */
528                 _audio.abortStream ();
529         }
530
531         if (!_playing) {
532                 return false;
533         }
534
535         _playing = false;
536         _play_button->SetValue (false);
537         return true;
538 }
539
540 void
541 FilmViewer::update_position_slider ()
542 {
543         if (!_film) {
544                 _slider->SetValue (0);
545                 return;
546         }
547
548         DCPTime const len = _film->length ();
549
550         if (len.get ()) {
551                 int const new_slider_position = 4096 * _video_position.get() / len.get();
552                 if (new_slider_position != _slider->GetValue()) {
553                         _slider->SetValue (new_slider_position);
554                 }
555         }
556 }
557
558 void
559 FilmViewer::update_position_label ()
560 {
561         if (!_film) {
562                 _frame_number->SetLabel ("0");
563                 _timecode->SetLabel ("0:0:0.0");
564                 return;
565         }
566
567         double const fps = _film->video_frame_rate ();
568         /* Count frame number from 1 ... not sure if this is the best idea */
569         _frame_number->SetLabel (wxString::Format (wxT("%ld"), lrint (_video_position.seconds() * fps) + 1));
570         _timecode->SetLabel (time_to_timecode (_video_position, fps));
571 }
572
573 void
574 FilmViewer::active_jobs_changed (optional<string> j)
575 {
576         /* examine content is the only job which stops the viewer working */
577         bool const a = !j || *j != "examine_content";
578         _slider->Enable (a);
579         _play_button->Enable (a);
580 }
581
582 DCPTime
583 FilmViewer::nudge_amount (wxMouseEvent& ev)
584 {
585         DCPTime amount = one_video_frame ();
586
587         if (ev.ShiftDown() && !ev.ControlDown()) {
588                 amount = DCPTime::from_seconds (1);
589         } else if (!ev.ShiftDown() && ev.ControlDown()) {
590                 amount = DCPTime::from_seconds (10);
591         } else if (ev.ShiftDown() && ev.ControlDown()) {
592                 amount = DCPTime::from_seconds (60);
593         }
594
595         return amount;
596 }
597
598 void
599 FilmViewer::go_to (DCPTime t)
600 {
601         if (t < DCPTime ()) {
602                 t = DCPTime ();
603         }
604
605         if (t >= _film->length ()) {
606                 t = _film->length ();
607         }
608
609         seek (t, true);
610         update_position_label ();
611         update_position_slider ();
612 }
613
614 void
615 FilmViewer::rewind_clicked (wxMouseEvent& ev)
616 {
617         go_to(DCPTime());
618         ev.Skip();
619 }
620
621 void
622 FilmViewer::back_clicked (wxMouseEvent& ev)
623 {
624         go_to (_video_position - nudge_amount (ev));
625         ev.Skip ();
626 }
627
628 void
629 FilmViewer::forward_clicked (wxMouseEvent& ev)
630 {
631         go_to (_video_position + nudge_amount (ev));
632         ev.Skip ();
633 }
634
635 void
636 FilmViewer::player_changed (int property, bool frequent)
637 {
638         if (frequent) {
639                 return;
640         }
641
642         if (_coalesce_player_changes) {
643                 _pending_player_changes.push_back (property);
644                 return;
645         }
646
647         calculate_sizes ();
648         bool refreshed = false;
649         if (
650                 property == VideoContentProperty::CROP ||
651                 property == VideoContentProperty::SCALE ||
652                 property == VideoContentProperty::FADE_IN ||
653                 property == VideoContentProperty::FADE_OUT ||
654                 property == VideoContentProperty::COLOUR_CONVERSION ||
655                 property == PlayerProperty::VIDEO_CONTAINER_SIZE ||
656                 property == PlayerProperty::FILM_CONTAINER
657                 ) {
658                 refreshed = quick_refresh ();
659         }
660
661         if (!refreshed) {
662                 slow_refresh ();
663         }
664         update_position_label ();
665         update_position_slider ();
666 }
667
668 void
669 FilmViewer::setup_sensitivity ()
670 {
671         bool const c = _film && !_film->content().empty ();
672
673         _slider->Enable (c);
674         _rewind_button->Enable (c);
675         _back_button->Enable (c);
676         _forward_button->Enable (c);
677         _play_button->Enable (c);
678         if (_outline_content) {
679                 _outline_content->Enable (c);
680         }
681         _frame_number->Enable (c);
682         _timecode->Enable (c);
683         if (_jump_to_selected) {
684                 _jump_to_selected->Enable (c);
685         }
686
687         _left_eye->Enable (c && _film->three_d ());
688         _right_eye->Enable (c && _film->three_d ());
689 }
690
691 void
692 FilmViewer::film_changed (Film::Property p)
693 {
694         if (p == Film::CONTENT || p == Film::THREE_D) {
695                 setup_sensitivity ();
696         } else if (p == Film::AUDIO_CHANNELS) {
697                 recreate_butler ();
698         }
699 }
700
701 /** Re-get the current frame slowly by seeking */
702 void
703 FilmViewer::slow_refresh ()
704 {
705         seek (_video_position, true);
706 }
707
708 /** Try to re-get the current frame quickly by resetting the metadata
709  *  in the PlayerVideo that we used last time.
710  *  @return true if this was possible, false if not.
711  */
712 bool
713 FilmViewer::quick_refresh ()
714 {
715         if (!_player_video.first) {
716                 return false;
717         }
718
719         if (!_player_video.first->reset_metadata (_player->video_container_size(), _film->frame_size())) {
720                 return false;
721         }
722
723         display_player_video ();
724         return true;
725 }
726
727 void
728 FilmViewer::set_position (DCPTime p)
729 {
730         _video_position = p;
731         seek (p, true);
732         update_position_label ();
733         update_position_slider ();
734 }
735
736 void
737 FilmViewer::set_coalesce_player_changes (bool c)
738 {
739         _coalesce_player_changes = c;
740
741         if (!c) {
742                 BOOST_FOREACH (int i, _pending_player_changes) {
743                         player_changed (i, false);
744                 }
745                 _pending_player_changes.clear ();
746         }
747 }
748
749 void
750 FilmViewer::timecode_clicked ()
751 {
752         PlayheadToTimecodeDialog* dialog = new PlayheadToTimecodeDialog (this, _film->video_frame_rate ());
753         if (dialog->ShowModal() == wxID_OK) {
754                 go_to (dialog->get ());
755         }
756         dialog->Destroy ();
757 }
758
759 void
760 FilmViewer::frame_number_clicked ()
761 {
762         PlayheadToFrameDialog* dialog = new PlayheadToFrameDialog (this, _film->video_frame_rate ());
763         if (dialog->ShowModal() == wxID_OK) {
764                 go_to (dialog->get ());
765         }
766         dialog->Destroy ();
767 }
768
769 void
770 FilmViewer::jump_to_selected_clicked ()
771 {
772         Config::instance()->set_jump_to_selected (_jump_to_selected->GetValue ());
773 }
774
775 void
776 FilmViewer::seek (DCPTime t, bool accurate)
777 {
778         if (!_butler) {
779                 return;
780         }
781
782         bool const was_running = stop ();
783
784         _butler->seek (t, accurate);
785         get ();
786
787         if (was_running) {
788                 start ();
789         }
790 }
791
792 void
793 FilmViewer::config_changed (Config::Property p)
794 {
795         if (p != Config::SOUND && p != Config::SOUND_OUTPUT) {
796                 return;
797         }
798
799         if (_audio.isStreamOpen ()) {
800                 _audio.closeStream ();
801         }
802
803         if (Config::instance()->sound()) {
804                 unsigned int st = 0;
805                 if (Config::instance()->sound_output()) {
806                         while (st < _audio.getDeviceCount()) {
807                                 if (_audio.getDeviceInfo(st).name == Config::instance()->sound_output().get()) {
808                                         break;
809                                 }
810                                 ++st;
811                         }
812                         if (st == _audio.getDeviceCount()) {
813                                 st = _audio.getDefaultOutputDevice();
814                         }
815                 } else {
816                         st = _audio.getDefaultOutputDevice();
817                 }
818
819                 _audio_channels = _audio.getDeviceInfo(st).outputChannels;
820
821                 RtAudio::StreamParameters sp;
822                 sp.deviceId = st;
823                 sp.nChannels = _audio_channels;
824                 sp.firstChannel = 0;
825                 try {
826                         _audio.openStream (&sp, 0, RTAUDIO_FLOAT32, 48000, &_audio_block_size, &rtaudio_callback, this);
827 #ifdef DCPOMATIC_USE_RTERROR
828                 } catch (RtError& e) {
829 #else
830                 } catch (RtAudioError& e) {
831 #endif
832                         error_dialog (
833                                 this,
834                                 _("Could not set up audio output.  There will be no audio during the preview."), std_to_wx(e.what())
835                                 );
836                 }
837                 recreate_butler ();
838
839         } else {
840                 _audio_channels = 0;
841                 recreate_butler ();
842         }
843 }
844
845 DCPTime
846 FilmViewer::time () const
847 {
848         if (_audio.isStreamRunning ()) {
849                 return DCPTime::from_seconds (const_cast<RtAudio*>(&_audio)->getStreamTime ()) -
850                         DCPTime::from_frames (average_latency(), _film->audio_frame_rate());
851         }
852
853         return _video_position;
854 }
855
856 int
857 FilmViewer::audio_callback (void* out_p, unsigned int frames)
858 {
859         _butler->get_audio (reinterpret_cast<float*> (out_p), frames);
860
861         boost::mutex::scoped_lock lm (_latency_history_mutex, boost::try_to_lock);
862         if (lm) {
863                 _latency_history.push_back (_audio.getStreamLatency ());
864                 if (_latency_history.size() > static_cast<size_t> (_latency_history_count)) {
865                         _latency_history.pop_front ();
866                 }
867         }
868
869         return 0;
870 }
871
872 Frame
873 FilmViewer::average_latency () const
874 {
875         boost::mutex::scoped_lock lm (_latency_history_mutex);
876         if (_latency_history.empty()) {
877                 return 0;
878         }
879
880         Frame total = 0;
881         BOOST_FOREACH (Frame i, _latency_history) {
882                 total += i;
883         }
884
885         return total / _latency_history.size();
886 }
887
888 void
889 FilmViewer::set_dcp_decode_reduction (optional<int> reduction)
890 {
891         _dcp_decode_reduction = reduction;
892         if (_player) {
893                 _player->set_dcp_decode_reduction (reduction);
894         }
895 }
896
897 optional<int>
898 FilmViewer::dcp_decode_reduction () const
899 {
900         return _dcp_decode_reduction;
901 }
902
903 DCPTime
904 FilmViewer::one_video_frame () const
905 {
906         return DCPTime::from_frames (1, _film->video_frame_rate());
907 }