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 #include "lib/text_content.h"
  49 extern "C" {
  50 #include <libavutil/pixfmt.h>
  51 }
  52 #include <dcp/exceptions.h>
  53 #include <wx/tglbtn.h>
  54 #include <iostream>
  55 #include <iomanip>
  56
  57 using std::string;
  58 using std::pair;
  59 using std::min;
  60 using std::max;
  61 using std::cout;
  62 using std::list;
  63 using std::bad_alloc;
  64 using std::make_pair;
  65 using std::exception;
  66 using boost::shared_ptr;
  67 using boost::dynamic_pointer_cast;
  68 using boost::weak_ptr;
  69 using boost::optional;
  70 #if BOOST_VERSION >= 106100
  71 using namespace boost::placeholders;
  72 #endif
  73 using dcp::Size;
  74
  75 static
  76 int
  77 rtaudio_callback (void* out, void *, unsigned int frames, double, RtAudioStreamStatus, void* data)
  78 {
  79         return reinterpret_cast<FilmViewer*>(data)->audio_callback (out, frames);
  80 }
  81
  82 FilmViewer::FilmViewer (wxWindow* p)
  83         : _panel (new wxPanel (p))
  84         , _coalesce_player_changes (false)
  85         , _audio (DCPOMATIC_RTAUDIO_API)
  86         , _audio_channels (0)
  87         , _audio_block_size (1024)
  88         , _playing (false)
  89         , _latency_history_count (0)
  90         , _dropped (0)
  91         , _closed_captions_dialog (new ClosedCaptionsDialog(p, this))
  92         , _outline_content (false)
  93         , _eyes (EYES_LEFT)
  94         , _pad_black (false)
  95 #ifdef DCPOMATIC_VARIANT_SWAROOP
  96         , _in_watermark (false)
  97         , _background_image (false)
  98 #endif
  99 {
 100 #ifndef __WXOSX__
 101         _panel->SetDoubleBuffered (true);
 102 #endif
 103
 104         _panel->SetBackgroundStyle (wxBG_STYLE_PAINT);
 105         _panel->SetBackgroundColour (*wxBLACK);
 106
 107         _panel->Bind (wxEVT_PAINT, boost::bind (&FilmViewer::paint_panel, this));
 108         _panel->Bind (wxEVT_SIZE,  boost::bind (&FilmViewer::panel_sized, this, _1));
 109         _timer.Bind  (wxEVT_TIMER, boost::bind (&FilmViewer::timer, this));
 110
 111         set_film (shared_ptr<Film> ());
 112
 113         _config_changed_connection = Config::instance()->Changed.connect (bind (&FilmViewer::config_changed, this, _1));
 114         config_changed (Config::SOUND_OUTPUT);
 115 }
 116
 117 FilmViewer::~FilmViewer ()
 118 {
 119         stop ();
 120 }
 121
 122 void
 123 FilmViewer::set_film (shared_ptr<Film> film)
 124 {
 125         if (_film == film) {
 126                 return;
 127         }
 128
 129         _film = film;
 130         _video_position = DCPTime ();
 131         _player_video.first.reset ();
 132         _player_video.second = DCPTime ();
 133
 134         _frame.reset ();
 135         _closed_captions_dialog->clear ();
 136
 137         if (!_film) {
 138                 _player.reset ();
 139                 recreate_butler ();
 140                 _frame.reset ();
 141                 refresh_panel ();
 142                 return;
 143         }
 144
 145         try {
 146                 _player.reset (new Player (_film, _film->playlist ()));
 147                 _player->set_fast ();
 148                 if (_dcp_decode_reduction) {
 149                         _player->set_dcp_decode_reduction (_dcp_decode_reduction);
 150                 }
 151         } catch (bad_alloc &) {
 152                 error_dialog (_panel, _("There is not enough free memory to do that."));
 153                 _film.reset ();
 154                 return;
 155         }
 156
 157         _player->set_always_burn_open_subtitles ();
 158         _player->set_play_referenced ();
 159
 160         _film->Change.connect (boost::bind (&FilmViewer::film_change, this, _1, _2));
 161         _film->ContentChange.connect (boost::bind(&FilmViewer::content_change, this, _1, _3));
 162         _player->Change.connect (boost::bind (&FilmViewer::player_change, this, _1, _2, _3));
 163
 164         /* Keep about 1 second's worth of history samples */
 165         _latency_history_count = _film->audio_frame_rate() / _audio_block_size;
 166
 167         _closed_captions_dialog->update_tracks (_film);
 168
 169         recreate_butler ();
 170
 171         calculate_sizes ();
 172         slow_refresh ();
 173 }
 174
 175 void
 176 FilmViewer::recreate_butler ()
 177 {
 178         bool const was_running = stop ();
 179         _butler.reset ();
 180
 181         if (!_film) {
 182                 return;
 183         }
 184
 185         AudioMapping map = AudioMapping (_film->audio_channels(), _audio_channels);
 186
 187         if (_audio_channels != 2 || _film->audio_channels() < 3) {
 188                 for (int i = 0; i < min (_film->audio_channels(), _audio_channels); ++i) {
 189                         map.set (i, i, 1);
 190                 }
 191         } else {
 192                 /* Special case: stereo output, at least 3 channel input.
 193                    Map so that Lt = L(-3dB) + Ls(-3dB) + C(-6dB) + Lfe(-10dB)
 194                                Rt = R(-3dB) + Rs(-3dB) + C(-6dB) + Lfe(-10dB)
 195                 */
 196                 if (_film->audio_channels() > 0) {
 197                         map.set (dcp::LEFT,   0, 1 / sqrt(2)); // L -> Lt
 198                 }
 199                 if (_film->audio_channels() > 1) {
 200                         map.set (dcp::RIGHT,  1, 1 / sqrt(2)); // R -> Rt
 201                 }
 202                 if (_film->audio_channels() > 2) {
 203                         map.set (dcp::CENTRE, 0, 1 / 2.0); // C -> Lt
 204                         map.set (dcp::CENTRE, 1, 1 / 2.0); // C -> Rt
 205                 }
 206                 if (_film->audio_channels() > 3) {
 207                         map.set (dcp::LFE,    0, 1 / sqrt(10)); // Lfe -> Lt
 208                         map.set (dcp::LFE,    1, 1 / sqrt(10)); // Lfe -> Rt
 209                 }
 210                 if (_film->audio_channels() > 4) {
 211                         map.set (dcp::LS,     0, 1 / sqrt(2)); // Ls -> Lt
 212                 }
 213                 if (_film->audio_channels() > 5) {
 214                         map.set (dcp::RS,     1, 1 / sqrt(2)); // Rs -> Rt
 215                 }
 216         }
 217
 218         _butler.reset (new Butler(_player, map, _audio_channels, bind(&PlayerVideo::force, _1, AV_PIX_FMT_RGB24), false, true));
 219         if (!Config::instance()->sound() && !_audio.isStreamOpen()) {
 220                 _butler->disable_audio ();
 221         }
 222
 223         _closed_captions_dialog->set_butler (_butler);
 224
 225         if (was_running) {
 226                 start ();
 227         }
 228 }
 229
 230 void
 231 FilmViewer::refresh_panel ()
 232 {
 233         _panel->Refresh ();
 234         _panel->Update ();
 235 }
 236
 237 void
 238 FilmViewer::get ()
 239 {
 240         DCPOMATIC_ASSERT (_butler);
 241
 242         do {
 243                 Butler::Error e;
 244                 _player_video = _butler->get_video (&e);
 245                 if (!_player_video.first && e == Butler::AGAIN) {
 246                         signal_manager->when_idle (boost::bind(&FilmViewer::get, this));
 247                         return;
 248                 }
 249         } while (
 250                 _player_video.first &&
 251                 _film->three_d() &&
 252                 _eyes != _player_video.first->eyes() &&
 253                 _player_video.first->eyes() != EYES_BOTH
 254                 );
 255
 256         try {
 257                 _butler->rethrow ();
 258         } catch (DecodeError& e) {
 259                 error_dialog (_panel, e.what());
 260         }
 261
 262         display_player_video ();
 263 }
 264
 265 void
 266 FilmViewer::display_player_video ()
 267 {
 268         if (!_player_video.first) {
 269                 _frame.reset ();
 270                 refresh_panel ();
 271                 return;
 272         }
 273
 274         if (_playing && (time() - _player_video.second) > one_video_frame()) {
 275                 /* Too late; just drop this frame before we try to get its image (which will be the time-consuming
 276                    part if this frame is J2K).
 277                 */
 278                 _video_position = _player_video.second;
 279                 ++_dropped;
 280                 return;
 281         }
 282
 283         /* In an ideal world, what we would do here is:
 284          *
 285          * 1. convert to XYZ exactly as we do in the DCP creation path.
 286          * 2. convert back to RGB for the preview display, compensating
 287          *    for the monitor etc. etc.
 288          *
 289          * but this is inefficient if the source is RGB.  Since we don't
 290          * (currently) care too much about the precise accuracy of the preview's
 291          * colour mapping (and we care more about its speed) we try to short-
 292          * circuit this "ideal" situation in some cases.
 293          *
 294          * The content's specified colour conversion indicates the colourspace
 295          * which the content is in (according to the user).
 296          *
 297          * PlayerVideo::image (bound to PlayerVideo::force) will take the source
 298          * image and convert it (from whatever the user has said it is) to RGB.
 299          */
 300
 301         _frame = _player_video.first->image (bind(&PlayerVideo::force, _1, AV_PIX_FMT_RGB24), false, true);
 302
 303         ImageChanged (_player_video.first);
 304
 305         _video_position = _player_video.second;
 306         _inter_position = _player_video.first->inter_position ();
 307         _inter_size = _player_video.first->inter_size ();
 308
 309         refresh_panel ();
 310
 311         _closed_captions_dialog->update (time());
 312 }
 313
 314 void
 315 FilmViewer::timer ()
 316 {
 317         if (!_film || !_playing) {
 318                 return;
 319         }
 320
 321         get ();
 322         PositionChanged ();
 323         DCPTime const next = _video_position + one_video_frame();
 324
 325         if (next >= _film->length()) {
 326                 stop ();
 327                 Finished ();
 328                 return;
 329         }
 330
 331         LOG_DEBUG_PLAYER("%1 -> %2; delay %3", next.seconds(), time().seconds(), max((next.seconds() - time().seconds()) * 1000, 1.0));
 332         _timer.Start (max ((next.seconds() - time().seconds()) * 1000, 1.0), wxTIMER_ONE_SHOT);
 333
 334         if (_butler) {
 335                 _butler->rethrow ();
 336         }
 337 }
 338
 339 bool
 340 #ifdef DCPOMATIC_VARIANT_SWAROOP
 341 FilmViewer::maybe_draw_background_image (wxPaintDC& dc)
 342 {
 343         optional<boost::filesystem::path> bg = Config::instance()->player_background_image();
 344         if (bg) {
 345                 wxImage image (std_to_wx(bg->string()));
 346                 wxBitmap bitmap (image);
 347                 dc.DrawBitmap (bitmap, max(0, (_panel_size.width - image.GetSize().GetWidth()) / 2), max(0, (_panel_size.height - image.GetSize().GetHeight()) / 2));
 348                 return true;
 349         }
 350
 351         return false;
 352 }
 353 #else
 354 FilmViewer::maybe_draw_background_image (wxPaintDC &)
 355 {
 356         return false;
 357 }
 358 #endif
 359
 360 void
 361 FilmViewer::paint_panel ()
 362 {
 363         wxPaintDC dc (_panel);
 364
 365 #ifdef DCPOMATIC_VARIANT_SWAROOP
 366         if (_background_image) {
 367                 dc.Clear ();
 368                 maybe_draw_background_image (dc);
 369                 return;
 370         }
 371 #endif
 372
 373         if (!_out_size.width || !_out_size.height || !_film || !_frame || _out_size != _frame->size()) {
 374                 dc.Clear ();
 375         } else {
 376
 377                 wxImage frame (_out_size.width, _out_size.height, _frame->data()[0], true);
 378                 wxBitmap frame_bitmap (frame);
 379                 dc.DrawBitmap (frame_bitmap, 0, max(0, (_panel_size.height - _out_size.height) / 2));
 380
 381 #ifdef DCPOMATIC_VARIANT_SWAROOP
 382                 DCPTime const period = DCPTime::from_seconds(Config::instance()->player_watermark_period() * 60);
 383                 int64_t n = _video_position.get() / period.get();
 384                 DCPTime from(n * period.get());
 385                 DCPTime to = from + DCPTime::from_seconds(Config::instance()->player_watermark_duration() / 1000.0);
 386                 if (from <= _video_position && _video_position <= to) {
 387                         if (!_in_watermark) {
 388                                 _in_watermark = true;
 389                                 _watermark_x = rand() % _panel_size.width;
 390                                 _watermark_y = rand() % _panel_size.height;
 391                         }
 392                         dc.SetTextForeground(*wxWHITE);
 393                         string wm = Config::instance()->player_watermark_theatre();
 394                         boost::posix_time::ptime t = boost::posix_time::second_clock::local_time();
 395                         wm += "\n" + boost::posix_time::to_iso_extended_string(t);
 396                         dc.DrawText(std_to_wx(wm), _watermark_x, _watermark_y);
 397                 } else {
 398                         _in_watermark = false;
 399                 }
 400 #endif
 401         }
 402
 403         if (_out_size.width < _panel_size.width) {
 404                 /* XXX: these colours are right for GNOME; may need adjusting for other OS */
 405                 wxPen   p (_pad_black ? wxColour(0, 0, 0) : wxColour(240, 240, 240));
 406                 wxBrush b (_pad_black ? wxColour(0, 0, 0) : wxColour(240, 240, 240));
 407                 dc.SetPen (p);
 408                 dc.SetBrush (b);
 409                 dc.DrawRectangle (_out_size.width, 0, _panel_size.width - _out_size.width, _panel_size.height);
 410         }
 411
 412         if (_out_size.height < _panel_size.height) {
 413                 wxPen   p (_pad_black ? wxColour(0, 0, 0) : wxColour(240, 240, 240));
 414                 wxBrush b (_pad_black ? wxColour(0, 0, 0) : wxColour(240, 240, 240));
 415                 dc.SetPen (p);
 416                 dc.SetBrush (b);
 417                 int const gap = (_panel_size.height - _out_size.height) / 2;
 418                 dc.DrawRectangle (0, 0, _panel_size.width, gap);
 419                 dc.DrawRectangle (0, gap + _out_size.height + 1, _panel_size.width, gap + 1);
 420         }
 421
 422         if (_outline_content) {
 423                 wxPen p (wxColour (255, 0, 0), 2);
 424                 dc.SetPen (p);
 425                 dc.SetBrush (*wxTRANSPARENT_BRUSH);
 426                 dc.DrawRectangle (_inter_position.x, _inter_position.y + (_panel_size.height - _out_size.height) / 2, _inter_size.width, _inter_size.height);
 427         }
 428 }
 429
 430 void
 431 FilmViewer::set_outline_content (bool o)
 432 {
 433         _outline_content = o;
 434         refresh_panel ();
 435 }
 436
 437 void
 438 FilmViewer::set_eyes (Eyes e)
 439 {
 440         _eyes = e;
 441         slow_refresh ();
 442 }
 443
 444 void
 445 FilmViewer::panel_sized (wxSizeEvent& ev)
 446 {
 447         _panel_size.width = ev.GetSize().GetWidth();
 448         _panel_size.height = ev.GetSize().GetHeight();
 449
 450         calculate_sizes ();
 451         if (!quick_refresh()) {
 452                 slow_refresh ();
 453         }
 454         PositionChanged ();
 455 }
 456
 457 void
 458 FilmViewer::calculate_sizes ()
 459 {
 460         if (!_film || !_player) {
 461                 return;
 462         }
 463
 464         Ratio const * container = _film->container ();
 465
 466         float const panel_ratio = _panel_size.ratio ();
 467         float const film_ratio = container ? container->ratio () : 1.78;
 468
 469         if (panel_ratio < film_ratio) {
 470                 /* panel is less widscreen than the film; clamp width */
 471                 _out_size.width = _panel_size.width;
 472                 _out_size.height = lrintf (_out_size.width / film_ratio);
 473         } else {
 474                 /* panel is more widescreen than the film; clamp height */
 475                 _out_size.height = _panel_size.height;
 476                 _out_size.width = lrintf (_out_size.height * film_ratio);
 477         }
 478
 479         /* Catch silly values */
 480         _out_size.width = max (64, _out_size.width);
 481         _out_size.height = max (64, _out_size.height);
 482
 483         _player->set_video_container_size (_out_size);
 484 }
 485
 486 void
 487 FilmViewer::start ()
 488 {
 489         if (!_film) {
 490                 return;
 491         }
 492
 493         optional<bool> v = PlaybackPermitted ();
 494         if (v && !*v) {
 495                 /* Computer says no */
 496                 return;
 497         }
 498
 499         if (_audio.isStreamOpen()) {
 500                 _audio.setStreamTime (_video_position.seconds());
 501                 _audio.startStream ();
 502         }
 503
 504         _playing = true;
 505         _dropped = 0;
 506         timer ();
 507         Started (position());
 508 }
 509
 510 bool
 511 FilmViewer::stop ()
 512 {
 513         if (_audio.isStreamRunning()) {
 514                 /* stop stream and discard any remaining queued samples */
 515                 _audio.abortStream ();
 516         }
 517
 518         if (!_playing) {
 519                 return false;
 520         }
 521
 522         _playing = false;
 523         Stopped (position());
 524         return true;
 525 }
 526
 527 void
 528 FilmViewer::player_change (ChangeType type, int property, bool frequent)
 529 {
 530         if (type != CHANGE_TYPE_DONE || frequent) {
 531                 return;
 532         }
 533
 534         if (_coalesce_player_changes) {
 535                 _pending_player_changes.push_back (property);
 536                 return;
 537         }
 538
 539         calculate_sizes ();
 540         bool refreshed = false;
 541         if (
 542                 property == VideoContentProperty::CROP ||
 543                 property == VideoContentProperty::SCALE ||
 544                 property == VideoContentProperty::FADE_IN ||
 545                 property == VideoContentProperty::FADE_OUT ||
 546                 property == VideoContentProperty::COLOUR_CONVERSION ||
 547                 property == PlayerProperty::VIDEO_CONTAINER_SIZE ||
 548                 property == PlayerProperty::FILM_CONTAINER
 549                 ) {
 550                 refreshed = quick_refresh ();
 551         }
 552
 553         if (!refreshed) {
 554                 slow_refresh ();
 555         }
 556         PositionChanged ();
 557 }
 558
 559 void
 560 FilmViewer::film_change (ChangeType type, Film::Property p)
 561 {
 562         if (type == CHANGE_TYPE_DONE && p == Film::AUDIO_CHANNELS) {
 563                 recreate_butler ();
 564         } else if (p == Film::CONTENT) {
 565                 _closed_captions_dialog->update_tracks (_film);
 566         }
 567 }
 568
 569 /** Re-get the current frame slowly by seeking */
 570 void
 571 FilmViewer::slow_refresh ()
 572 {
 573         seek (_video_position, true);
 574 }
 575
 576 /** Try to re-get the current frame quickly by resetting the metadata
 577  *  in the PlayerVideo that we used last time.
 578  *  @return true if this was possible, false if not.
 579  */
 580 bool
 581 FilmViewer::quick_refresh ()
 582 {
 583         if (!_player_video.first) {
 584                 return false;
 585         }
 586
 587         if (!_player_video.first->reset_metadata (_film, _player->video_container_size(), _film->frame_size())) {
 588                 return false;
 589         }
 590
 591         display_player_video ();
 592         return true;
 593 }
 594
 595 void
 596 FilmViewer::seek (shared_ptr<Content> content, ContentTime t, bool accurate)
 597 {
 598         optional<DCPTime> dt = _player->content_time_to_dcp (content, t);
 599         if (dt) {
 600                 seek (*dt, accurate);
 601         }
 602 }
 603
 604 void
 605 FilmViewer::set_coalesce_player_changes (bool c)
 606 {
 607         _coalesce_player_changes = c;
 608
 609         if (!c) {
 610                 BOOST_FOREACH (int i, _pending_player_changes) {
 611                         player_change (CHANGE_TYPE_DONE, i, false);
 612                 }
 613                 _pending_player_changes.clear ();
 614         }
 615 }
 616
 617 void
 618 FilmViewer::seek (DCPTime t, bool accurate)
 619 {
 620         if (!_butler) {
 621                 return;
 622         }
 623
 624         if (t < DCPTime ()) {
 625                 t = DCPTime ();
 626         }
 627
 628         if (t >= _film->length ()) {
 629                 t = _film->length ();
 630         }
 631
 632         bool const was_running = stop ();
 633
 634         _closed_captions_dialog->clear ();
 635         _butler->seek (t, accurate);
 636         get ();
 637
 638         if (was_running) {
 639                 start ();
 640         }
 641
 642         PositionChanged ();
 643 }
 644
 645 void
 646 FilmViewer::config_changed (Config::Property p)
 647 {
 648 #ifdef DCPOMATIC_VARIANT_SWAROOP
 649         if (p == Config::PLAYER_BACKGROUND_IMAGE) {
 650                 refresh_panel ();
 651                 return;
 652         }
 653 #endif
 654
 655         if (p != Config::SOUND && p != Config::SOUND_OUTPUT) {
 656                 return;
 657         }
 658
 659         if (_audio.isStreamOpen ()) {
 660                 _audio.closeStream ();
 661         }
 662
 663         if (Config::instance()->sound() && _audio.getDeviceCount() > 0) {
 664                 unsigned int st = 0;
 665                 if (Config::instance()->sound_output()) {
 666                         while (st < _audio.getDeviceCount()) {
 667                                 if (_audio.getDeviceInfo(st).name == Config::instance()->sound_output().get()) {
 668                                         break;
 669                                 }
 670                                 ++st;
 671                         }
 672                         if (st == _audio.getDeviceCount()) {
 673                                 st = _audio.getDefaultOutputDevice();
 674                         }
 675                 } else {
 676                         st = _audio.getDefaultOutputDevice();
 677                 }
 678
 679                 _audio_channels = _audio.getDeviceInfo(st).outputChannels;
 680
 681                 RtAudio::StreamParameters sp;
 682                 sp.deviceId = st;
 683                 sp.nChannels = _audio_channels;
 684                 sp.firstChannel = 0;
 685                 try {
 686                         _audio.openStream (&sp, 0, RTAUDIO_FLOAT32, 48000, &_audio_block_size, &rtaudio_callback, this);
 687 #ifdef DCPOMATIC_USE_RTERROR
 688                 } catch (RtError& e) {
 689 #else
 690                 } catch (RtAudioError& e) {
 691 #endif
 692                         error_dialog (
 693                                 _panel,
 694                                 _("Could not set up audio output.  There will be no audio during the preview."), std_to_wx(e.what())
 695                                 );
 696                 }
 697                 recreate_butler ();
 698
 699         } else {
 700                 _audio_channels = 0;
 701                 recreate_butler ();
 702         }
 703 }
 704
 705 DCPTime
 706 FilmViewer::uncorrected_time () const
 707 {
 708         if (_audio.isStreamRunning ()) {
 709                 return DCPTime::from_seconds (const_cast<RtAudio*>(&_audio)->getStreamTime());
 710         }
 711
 712         return _video_position;
 713 }
 714
 715 DCPTime
 716 FilmViewer::time () const
 717 {
 718         if (_audio.isStreamRunning ()) {
 719                 return DCPTime::from_seconds (const_cast<RtAudio*>(&_audio)->getStreamTime ()) -
 720                         DCPTime::from_frames (average_latency(), _film->audio_frame_rate());
 721         }
 722
 723         return _video_position;
 724 }
 725
 726 int
 727 FilmViewer::audio_callback (void* out_p, unsigned int frames)
 728 {
 729         while (true) {
 730                 optional<DCPTime> t = _butler->get_audio (reinterpret_cast<float*> (out_p), frames);
 731                 if (!t || DCPTime(uncorrected_time() - *t) < one_video_frame()) {
 732                         /* There was an underrun or this audio is on time; carry on */
 733                         break;
 734                 }
 735                 /* The audio we just got was (very) late; drop it and get some more. */
 736         }
 737
 738         boost::mutex::scoped_lock lm (_latency_history_mutex, boost::try_to_lock);
 739         if (lm) {
 740                 _latency_history.push_back (_audio.getStreamLatency ());
 741                 if (_latency_history.size() > static_cast<size_t> (_latency_history_count)) {
 742                         _latency_history.pop_front ();
 743                 }
 744         }
 745
 746         return 0;
 747 }
 748
 749 Frame
 750 FilmViewer::average_latency () const
 751 {
 752         boost::mutex::scoped_lock lm (_latency_history_mutex);
 753         if (_latency_history.empty()) {
 754                 return 0;
 755         }
 756
 757         Frame total = 0;
 758         BOOST_FOREACH (Frame i, _latency_history) {
 759                 total += i;
 760         }
 761
 762         return total / _latency_history.size();
 763 }
 764
 765 void
 766 FilmViewer::set_dcp_decode_reduction (optional<int> reduction)
 767 {
 768         _dcp_decode_reduction = reduction;
 769         if (_player) {
 770                 _player->set_dcp_decode_reduction (reduction);
 771         }
 772 }
 773
 774 optional<int>
 775 FilmViewer::dcp_decode_reduction () const
 776 {
 777         return _dcp_decode_reduction;
 778 }
 779
 780 DCPTime
 781 FilmViewer::one_video_frame () const
 782 {
 783         return DCPTime::from_frames (1, _film->video_frame_rate());
 784 }
 785
 786 /** Open a dialog box showing our film's closed captions */
 787 void
 788 FilmViewer::show_closed_captions ()
 789 {
 790         _closed_captions_dialog->Show();
 791 }
 792
 793 void
 794 FilmViewer::seek_by (DCPTime by, bool accurate)
 795 {
 796         seek (_video_position + by, accurate);
 797 }
 798
 799 void
 800 FilmViewer::set_pad_black (bool p)
 801 {
 802         _pad_black = p;
 803 }
 804
 805 void
 806 FilmViewer::content_change (ChangeType type, int property)
 807 {
 808         if (type != CHANGE_TYPE_DONE) {
 809                 return;
 810         }
 811
 812         if (property == TextContentProperty::USE || property == TextContentProperty::TYPE || property == TextContentProperty::DCP_TRACK) {
 813                 _closed_captions_dialog->update_tracks (_film);
 814         }
 815 }