src/wx/video_view.cc

   1 /*
   2     Copyright (C) 2019-2021 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
  22 #include "video_view.h"
  23 #include "wx_util.h"
  24 #include "film_viewer.h"
  25 #include "lib/butler.h"
  26 #include "lib/dcpomatic_log.h"
  27 #include <boost/optional.hpp>
  28 #include <sys/time.h>
  29
  30
  31 using std::pair;
  32 using std::shared_ptr;
  33 using boost::optional;
  34
  35
  36 static constexpr int TOO_MANY_DROPPED_FRAMES = 20;
  37 static constexpr int TOO_MANY_DROPPED_PERIOD = 5.0;
  38
  39
  40 VideoView::VideoView (FilmViewer* viewer)
  41         : _viewer (viewer)
  42         , _state_timer ("viewer")
  43 {
  44
  45 }
  46
  47
  48 void
  49 VideoView::clear ()
  50 {
  51         boost::mutex::scoped_lock lm (_mutex);
  52         _player_video.first.reset ();
  53         _player_video.second = dcpomatic::DCPTime ();
  54 }
  55
  56
  57 /** Could be called from any thread.
  58  *  @param non_blocking true to return false quickly if no video is available quickly.
  59  *  @return FAIL if there's no frame, AGAIN if the method should be called again, or SUCCESS
  60  *  if there is a frame.
  61  */
  62 VideoView::NextFrameResult
  63 VideoView::get_next_frame (bool non_blocking)
  64 {
  65         if (length() == dcpomatic::DCPTime()) {
  66                 return FAIL;
  67         }
  68
  69         auto butler = _viewer->butler ();
  70         if (!butler) {
  71                 return FAIL;
  72         }
  73         add_get ();
  74
  75         boost::mutex::scoped_lock lm (_mutex);
  76
  77         do {
  78                 Butler::Error e;
  79                 auto pv = butler->get_video (!non_blocking, &e);
  80                 if (e.code == Butler::Error::DIED) {
  81                         LOG_ERROR ("Butler died with %1", e.summary());
  82                 }
  83                 if (!pv.first) {
  84                         return e.code == Butler::Error::AGAIN ? AGAIN : FAIL;
  85                 }
  86                 _player_video = pv;
  87         } while (
  88                 _player_video.first &&
  89                 _three_d &&
  90                 _eyes != _player_video.first->eyes() &&
  91                 _player_video.first->eyes() != Eyes::BOTH
  92                 );
  93
  94         if (_player_video.first && _player_video.first->error()) {
  95                 ++_errored;
  96         }
  97
  98         return SUCCESS;
  99 }
 100
 101
 102 dcpomatic::DCPTime
 103 VideoView::one_video_frame () const
 104 {
 105         return dcpomatic::DCPTime::from_frames (1, video_frame_rate());
 106 }
 107
 108
 109 /** @return Time in ms until the next frame is due, or empty if nothing is due */
 110 optional<int>
 111 VideoView::time_until_next_frame () const
 112 {
 113         if (length() == dcpomatic::DCPTime()) {
 114                 /* There's no content, so this doesn't matter */
 115                 return optional<int>();
 116         }
 117
 118         auto const next = position() + one_video_frame();
 119         auto const time = _viewer->audio_time().get_value_or(position());
 120         if (next < time) {
 121                 return 0;
 122         }
 123         return (next.seconds() - time.seconds()) * 1000;
 124 }
 125
 126
 127 void
 128 VideoView::start ()
 129 {
 130         boost::mutex::scoped_lock lm (_mutex);
 131         _dropped = 0;
 132         _errored = 0;
 133         gettimeofday(&_dropped_check_period_start, nullptr);
 134 }
 135
 136
 137 bool
 138 VideoView::reset_metadata (shared_ptr<const Film> film, dcp::Size player_video_container_size)
 139 {
 140         auto pv = player_video ();
 141         if (!pv.first) {
 142                 return false;
 143         }
 144
 145         if (!pv.first->reset_metadata(film, player_video_container_size)) {
 146                 return false;
 147         }
 148
 149         update ();
 150         return true;
 151 }
 152
 153
 154 void
 155 VideoView::add_dropped ()
 156 {
 157         bool too_many = false;
 158
 159         {
 160                 boost::mutex::scoped_lock lm (_mutex);
 161                 ++_dropped;
 162                 if (_dropped > TOO_MANY_DROPPED_FRAMES) {
 163                         struct timeval now;
 164                         gettimeofday (&now, nullptr);
 165                         double const elapsed = seconds(now) - seconds(_dropped_check_period_start);
 166                         too_many = elapsed < TOO_MANY_DROPPED_PERIOD;
 167                         _dropped = 0;
 168                         _dropped_check_period_start = now;
 169                 }
 170         }
 171
 172         if (too_many) {
 173                 emit (boost::bind(boost::ref(TooManyDropped)));
 174         }
 175 }
 176
 177
 178 wxColour
 179 VideoView::pad_colour () const
 180 {
 181         if (_viewer->pad_black()) {
 182                 return wxColour(0, 0, 0);
 183         } else if (gui_is_dark()) {
 184                 return wxColour(50, 50, 50);
 185         } else {
 186                 return wxColour(240, 240, 240);
 187         }
 188 }
 189