src/lib/referenced_reel_asset.cc

   1 /*
   2     Copyright (C) 2015 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 "dcp_content.h"
  23 #include "dcp_decoder.h"
  24 #include "dcpomatic_assert.h"
  25 #include "film.h"
  26 #include "playlist.h"
  27 #include "referenced_reel_asset.h"
  28 #include <dcp/reel.h>
  29 #include <dcp/reel_asset.h>
  30 #include <dcp/reel_closed_caption_asset.h>
  31 #include <dcp/reel_picture_asset.h>
  32 #include <dcp/reel_sound_asset.h>
  33 #include <dcp/reel_subtitle_asset.h>
  34 #include <cmath>
  35
  36
  37 using std::list;
  38 using std::max;
  39 using std::min;
  40 using std::shared_ptr;
  41 using boost::dynamic_pointer_cast;
  42 using boost::scoped_ptr;
  43 using namespace dcpomatic;
  44
  45
  46 static void
  47 maybe_add_asset (list<ReferencedReelAsset>& a, shared_ptr<dcp::ReelAsset> r, Frame reel_trim_start, Frame reel_trim_end, DCPTime from, int const ffr)
  48 {
  49         DCPOMATIC_ASSERT (r);
  50         r->set_entry_point (r->entry_point().get_value_or(0) + reel_trim_start);
  51         r->set_duration (r->actual_duration() - reel_trim_start - reel_trim_end);
  52         if (r->actual_duration() > 0) {
  53                 a.push_back (
  54                         ReferencedReelAsset(r, DCPTimePeriod(from, from + DCPTime::from_frames(r->actual_duration(), ffr)))
  55                         );
  56         }
  57 }
  58
  59
  60
  61 /** @return Details of all the DCP assets in a playlist that are marked to refer to */
  62 list<ReferencedReelAsset>
  63 get_referenced_reel_assets(shared_ptr<const Film> film, shared_ptr<const Playlist> playlist)
  64 {
  65         list<ReferencedReelAsset> reel_assets;
  66
  67         for (auto content: playlist->content()) {
  68                 auto dcp = dynamic_pointer_cast<DCPContent>(content);
  69                 if (!dcp) {
  70                         continue;
  71                 }
  72
  73                 if (!dcp->reference_video() && !dcp->reference_audio() && !dcp->reference_text(TextType::OPEN_SUBTITLE) && !dcp->reference_text(TextType::CLOSED_CAPTION)) {
  74                         continue;
  75                 }
  76
  77                 scoped_ptr<DCPDecoder> decoder;
  78                 try {
  79                         decoder.reset(new DCPDecoder(film, dcp, false, false, shared_ptr<DCPDecoder>()));
  80                 } catch (...) {
  81                         return reel_assets;
  82                 }
  83
  84                 auto const frame_rate = film->video_frame_rate();
  85                 DCPOMATIC_ASSERT (dcp->video_frame_rate());
  86                 /* We should only be referencing if the DCP rate is the same as the film rate */
  87                 DCPOMATIC_ASSERT (std::round(dcp->video_frame_rate().get()) == frame_rate);
  88
  89                 Frame const trim_start = dcp->trim_start().frames_round(frame_rate);
  90                 Frame const trim_end = dcp->trim_end().frames_round(frame_rate);
  91
  92                 /* position in the asset from the start */
  93                 int64_t offset_from_start = 0;
  94                 /* position i the asset from the end */
  95                 int64_t offset_from_end = 0;
  96                 for (auto reel: decoder->reels()) {
  97                         /* Assume that main picture duration is the length of the reel */
  98                         offset_from_end += reel->main_picture()->actual_duration();
  99                 }
 100
 101                 for (auto reel: decoder->reels()) {
 102
 103                         /* Assume that main picture duration is the length of the reel */
 104                         int64_t const reel_duration = reel->main_picture()->actual_duration();
 105
 106                         /* See doc/design/trim_reels.svg */
 107                         Frame const reel_trim_start = min(reel_duration, max(int64_t(0), trim_start - offset_from_start));
 108                         Frame const reel_trim_end =   min(reel_duration, max(int64_t(0), reel_duration - (offset_from_end - trim_end)));
 109
 110                         auto const from = content->position() + std::max(DCPTime(), DCPTime::from_frames(offset_from_start - trim_start, frame_rate));
 111                         if (dcp->reference_video()) {
 112                                 maybe_add_asset (reel_assets, reel->main_picture(), reel_trim_start, reel_trim_end, from, frame_rate);
 113                         }
 114
 115                         if (dcp->reference_audio()) {
 116                                 maybe_add_asset (reel_assets, reel->main_sound(), reel_trim_start, reel_trim_end, from, frame_rate);
 117                         }
 118
 119                         if (dcp->reference_text(TextType::OPEN_SUBTITLE)) {
 120                                 maybe_add_asset (reel_assets, reel->main_subtitle(), reel_trim_start, reel_trim_end, from, frame_rate);
 121                         }
 122
 123                         if (dcp->reference_text(TextType::CLOSED_CAPTION)) {
 124                                 for (auto caption: reel->closed_captions()) {
 125                                         maybe_add_asset (reel_assets, caption, reel_trim_start, reel_trim_end, from, frame_rate);
 126                                 }
 127                         }
 128
 129                         offset_from_start += reel_duration;
 130                         offset_from_end -= reel_duration;
 131                 }
 132         }
 133
 134         return reel_assets;
 135 }
 136