Speed some operations by re-using the last PlayerVideo but with
[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) {
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         quick_refresh ();
450         update_position_label ();
451         update_position_slider ();
452 }
453
454 void
455 FilmViewer::calculate_sizes ()
456 {
457         if (!_film) {
458                 return;
459         }
460
461         Ratio const * container = _film->container ();
462
463         float const panel_ratio = _panel_size.ratio ();
464         float const film_ratio = container ? container->ratio () : 1.78;
465
466         if (panel_ratio < film_ratio) {
467                 /* panel is less widscreen than the film; clamp width */
468                 _out_size.width = _panel_size.width;
469                 _out_size.height = lrintf (_out_size.width / film_ratio);
470         } else {
471                 /* panel is more widescreen than the film; clamp height */
472                 _out_size.height = _panel_size.height;
473                 _out_size.width = lrintf (_out_size.height * film_ratio);
474         }
475
476         /* Catch silly values */
477         _out_size.width = max (64, _out_size.width);
478         _out_size.height = max (64, _out_size.height);
479
480         _player->set_video_container_size (_out_size);
481 }
482
483 void
484 FilmViewer::play_clicked ()
485 {
486         check_play_state ();
487 }
488
489 void
490 FilmViewer::check_play_state ()
491 {
492         if (!_film || _film->video_frame_rate() == 0) {
493                 return;
494         }
495
496         if (_play_button->GetValue()) {
497                 start ();
498         } else {
499                 stop ();
500         }
501 }
502
503 void
504 FilmViewer::start ()
505 {
506         if (_audio.isStreamOpen()) {
507                 _audio.setStreamTime (_video_position.seconds());
508                 _audio.startStream ();
509         }
510
511         _playing = true;
512         _dropped = 0;
513         timer ();
514         _play_button->SetValue (true);
515 }
516
517 bool
518 FilmViewer::stop ()
519 {
520         if (_audio.isStreamRunning()) {
521                 /* stop stream and discard any remaining queued samples */
522                 _audio.abortStream ();
523         }
524
525         if (!_playing) {
526                 return false;
527         }
528
529         _playing = false;
530         _play_button->SetValue (false);
531         return true;
532 }
533
534 void
535 FilmViewer::update_position_slider ()
536 {
537         if (!_film) {
538                 _slider->SetValue (0);
539                 return;
540         }
541
542         DCPTime const len = _film->length ();
543
544         if (len.get ()) {
545                 int const new_slider_position = 4096 * _video_position.get() / len.get();
546                 if (new_slider_position != _slider->GetValue()) {
547                         _slider->SetValue (new_slider_position);
548                 }
549         }
550 }
551
552 void
553 FilmViewer::update_position_label ()
554 {
555         if (!_film) {
556                 _frame_number->SetLabel ("0");
557                 _timecode->SetLabel ("0:0:0.0");
558                 return;
559         }
560
561         double const fps = _film->video_frame_rate ();
562         /* Count frame number from 1 ... not sure if this is the best idea */
563         _frame_number->SetLabel (wxString::Format (wxT("%ld"), lrint (_video_position.seconds() * fps) + 1));
564         _timecode->SetLabel (time_to_timecode (_video_position, fps));
565 }
566
567 void
568 FilmViewer::active_jobs_changed (optional<string> j)
569 {
570         /* examine content is the only job which stops the viewer working */
571         bool const a = !j || *j != "examine_content";
572         _slider->Enable (a);
573         _play_button->Enable (a);
574 }
575
576 DCPTime
577 FilmViewer::nudge_amount (wxMouseEvent& ev)
578 {
579         DCPTime amount = one_video_frame ();
580
581         if (ev.ShiftDown() && !ev.ControlDown()) {
582                 amount = DCPTime::from_seconds (1);
583         } else if (!ev.ShiftDown() && ev.ControlDown()) {
584                 amount = DCPTime::from_seconds (10);
585         } else if (ev.ShiftDown() && ev.ControlDown()) {
586                 amount = DCPTime::from_seconds (60);
587         }
588
589         return amount;
590 }
591
592 void
593 FilmViewer::go_to (DCPTime t)
594 {
595         if (t < DCPTime ()) {
596                 t = DCPTime ();
597         }
598
599         if (t >= _film->length ()) {
600                 t = _film->length ();
601         }
602
603         seek (t, true);
604         update_position_label ();
605         update_position_slider ();
606 }
607
608 void
609 FilmViewer::rewind_clicked (wxMouseEvent& ev)
610 {
611         go_to(DCPTime());
612         ev.Skip();
613 }
614
615 void
616 FilmViewer::back_clicked (wxMouseEvent& ev)
617 {
618         go_to (_video_position - nudge_amount (ev));
619         ev.Skip ();
620 }
621
622 void
623 FilmViewer::forward_clicked (wxMouseEvent& ev)
624 {
625         go_to (_video_position + nudge_amount (ev));
626         ev.Skip ();
627 }
628
629 void
630 FilmViewer::player_changed (int property, bool frequent)
631 {
632         if (frequent) {
633                 return;
634         }
635
636         if (_coalesce_player_changes) {
637                 _pending_player_changes.push_back (property);
638                 return;
639         }
640
641         calculate_sizes ();
642         if (
643                 property == VideoContentProperty::CROP ||
644                 property == VideoContentProperty::SCALE ||
645                 property == VideoContentProperty::FADE_IN ||
646                 property == VideoContentProperty::FADE_OUT ||
647                 property == VideoContentProperty::COLOUR_CONVERSION ||
648                 property == PlayerProperty::VIDEO_CONTAINER_SIZE ||
649                 property == PlayerProperty::FILM_CONTAINER
650                 ) {
651                 quick_refresh ();
652         } else {
653                 slow_refresh ();
654         }
655         update_position_label ();
656         update_position_slider ();
657 }
658
659 void
660 FilmViewer::setup_sensitivity ()
661 {
662         bool const c = _film && !_film->content().empty ();
663
664         _slider->Enable (c);
665         _rewind_button->Enable (c);
666         _back_button->Enable (c);
667         _forward_button->Enable (c);
668         _play_button->Enable (c);
669         if (_outline_content) {
670                 _outline_content->Enable (c);
671         }
672         _frame_number->Enable (c);
673         _timecode->Enable (c);
674         if (_jump_to_selected) {
675                 _jump_to_selected->Enable (c);
676         }
677
678         _left_eye->Enable (c && _film->three_d ());
679         _right_eye->Enable (c && _film->three_d ());
680 }
681
682 void
683 FilmViewer::film_changed (Film::Property p)
684 {
685         if (p == Film::CONTENT || p == Film::THREE_D) {
686                 setup_sensitivity ();
687         } else if (p == Film::AUDIO_CHANNELS) {
688                 recreate_butler ();
689         }
690 }
691
692 /** Re-get the current frame slowly by seeking */
693 void
694 FilmViewer::slow_refresh ()
695 {
696         seek (_video_position, true);
697 }
698
699 /** Re-get the current frame quickly by resetting the metadata in the PlayerVideo that we used last time */
700 void
701 FilmViewer::quick_refresh ()
702 {
703         if (!_player_video.first) {
704                 return;
705         }
706
707         _player_video.first->reset_metadata (_player->video_container_size(), _film->frame_size());
708         display_player_video ();
709 }
710
711 void
712 FilmViewer::set_position (DCPTime p)
713 {
714         _video_position = p;
715         seek (p, true);
716         update_position_label ();
717         update_position_slider ();
718 }
719
720 void
721 FilmViewer::set_coalesce_player_changes (bool c)
722 {
723         _coalesce_player_changes = c;
724
725         if (!c) {
726                 BOOST_FOREACH (int i, _pending_player_changes) {
727                         player_changed (i, false);
728                 }
729                 _pending_player_changes.clear ();
730         }
731 }
732
733 void
734 FilmViewer::timecode_clicked ()
735 {
736         PlayheadToTimecodeDialog* dialog = new PlayheadToTimecodeDialog (this, _film->video_frame_rate ());
737         if (dialog->ShowModal() == wxID_OK) {
738                 go_to (dialog->get ());
739         }
740         dialog->Destroy ();
741 }
742
743 void
744 FilmViewer::frame_number_clicked ()
745 {
746         PlayheadToFrameDialog* dialog = new PlayheadToFrameDialog (this, _film->video_frame_rate ());
747         if (dialog->ShowModal() == wxID_OK) {
748                 go_to (dialog->get ());
749         }
750         dialog->Destroy ();
751 }
752
753 void
754 FilmViewer::jump_to_selected_clicked ()
755 {
756         Config::instance()->set_jump_to_selected (_jump_to_selected->GetValue ());
757 }
758
759 void
760 FilmViewer::seek (DCPTime t, bool accurate)
761 {
762         if (!_butler) {
763                 return;
764         }
765
766         bool const was_running = stop ();
767
768         _butler->seek (t, accurate);
769         get ();
770
771         if (was_running) {
772                 start ();
773         }
774 }
775
776 void
777 FilmViewer::config_changed (Config::Property p)
778 {
779         if (p != Config::SOUND && p != Config::SOUND_OUTPUT) {
780                 return;
781         }
782
783         if (_audio.isStreamOpen ()) {
784                 _audio.closeStream ();
785         }
786
787         if (Config::instance()->sound()) {
788                 unsigned int st = 0;
789                 if (Config::instance()->sound_output()) {
790                         while (st < _audio.getDeviceCount()) {
791                                 if (_audio.getDeviceInfo(st).name == Config::instance()->sound_output().get()) {
792                                         break;
793                                 }
794                                 ++st;
795                         }
796                         if (st == _audio.getDeviceCount()) {
797                                 st = _audio.getDefaultOutputDevice();
798                         }
799                 } else {
800                         st = _audio.getDefaultOutputDevice();
801                 }
802
803                 _audio_channels = _audio.getDeviceInfo(st).outputChannels;
804
805                 RtAudio::StreamParameters sp;
806                 sp.deviceId = st;
807                 sp.nChannels = _audio_channels;
808                 sp.firstChannel = 0;
809                 try {
810                         _audio.openStream (&sp, 0, RTAUDIO_FLOAT32, 48000, &_audio_block_size, &rtaudio_callback, this);
811 #ifdef DCPOMATIC_USE_RTERROR
812                 } catch (RtError& e) {
813 #else
814                 } catch (RtAudioError& e) {
815 #endif
816                         error_dialog (
817                                 this,
818                                 _("Could not set up audio output.  There will be no audio during the preview."), std_to_wx(e.what())
819                                 );
820                 }
821                 recreate_butler ();
822
823         } else {
824                 _audio_channels = 0;
825                 recreate_butler ();
826         }
827 }
828
829 DCPTime
830 FilmViewer::time () const
831 {
832         if (_audio.isStreamRunning ()) {
833                 return DCPTime::from_seconds (const_cast<RtAudio*>(&_audio)->getStreamTime ()) -
834                         DCPTime::from_frames (average_latency(), _film->audio_frame_rate());
835         }
836
837         return _video_position;
838 }
839
840 int
841 FilmViewer::audio_callback (void* out_p, unsigned int frames)
842 {
843         _butler->get_audio (reinterpret_cast<float*> (out_p), frames);
844
845         boost::mutex::scoped_lock lm (_latency_history_mutex, boost::try_to_lock);
846         if (lm) {
847                 _latency_history.push_back (_audio.getStreamLatency ());
848                 if (_latency_history.size() > static_cast<size_t> (_latency_history_count)) {
849                         _latency_history.pop_front ();
850                 }
851         }
852
853         return 0;
854 }
855
856 Frame
857 FilmViewer::average_latency () const
858 {
859         boost::mutex::scoped_lock lm (_latency_history_mutex);
860         if (_latency_history.empty()) {
861                 return 0;
862         }
863
864         Frame total = 0;
865         BOOST_FOREACH (Frame i, _latency_history) {
866                 total += i;
867         }
868
869         return total / _latency_history.size();
870 }
871
872 void
873 FilmViewer::set_dcp_decode_reduction (optional<int> reduction)
874 {
875         _dcp_decode_reduction = reduction;
876         if (_player) {
877                 _player->set_dcp_decode_reduction (reduction);
878         }
879 }
880
881 optional<int>
882 FilmViewer::dcp_decode_reduction () const
883 {
884         return _dcp_decode_reduction;
885 }
886
887 DCPTime
888 FilmViewer::one_video_frame () const
889 {
890         return DCPTime::from_frames (1, _film->video_frame_rate());
891 }