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