2 Copyright (C) 2014-2016 Carl Hetherington <cth@carlh.net>
4 This file is part of DCP-o-matic.
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.
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.
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/>.
21 #include "text_subtitle_decoder.h"
22 #include "text_subtitle_content.h"
23 #include "subtitle_content.h"
24 #include <dcp/subtitle_string.h>
25 #include <boost/foreach.hpp>
33 using boost::shared_ptr;
34 using boost::optional;
35 using boost::dynamic_pointer_cast;
37 TextSubtitleDecoder::TextSubtitleDecoder (shared_ptr<const TextSubtitleContent> content)
38 : TextSubtitle (content)
45 bind (&TextSubtitleDecoder::image_subtitles_during, this, _1, _2),
46 bind (&TextSubtitleDecoder::text_subtitles_during, this, _1, _2)
52 TextSubtitleDecoder::seek (ContentTime time, bool accurate)
54 subtitle->seek (time, accurate);
57 while (_next < _subtitles.size() && ContentTime::from_seconds (_subtitles[_next].from.all_as_seconds ()) < time) {
63 TextSubtitleDecoder::pass (PassReason, bool)
65 if (_next >= _subtitles.size ()) {
69 ContentTimePeriod const p = content_time_period (_subtitles[_next]);
70 subtitle->give_text (p, _subtitles[_next]);
71 subtitle->set_position (p.from);
77 list<ContentTimePeriod>
78 TextSubtitleDecoder::image_subtitles_during (ContentTimePeriod, bool) const
80 return list<ContentTimePeriod> ();
83 list<ContentTimePeriod>
84 TextSubtitleDecoder::text_subtitles_during (ContentTimePeriod p, bool starting) const
86 /* XXX: inefficient */
88 list<ContentTimePeriod> d;
90 /* Only take `during' (not starting) subs if they overlap more than half the requested period;
91 here's the threshold for being significant.
93 ContentTime const significant (p.duration().get() / 2);
95 for (vector<sub::Subtitle>::const_iterator i = _subtitles.begin(); i != _subtitles.end(); ++i) {
96 ContentTimePeriod t = content_time_period (*i);
97 if (starting && p.contains(t.from)) {
99 } else if (!starting) {
100 optional<ContentTimePeriod> const o = p.overlap (t);
101 if (o && o->duration() > significant) {
111 TextSubtitleDecoder::content_time_period (sub::Subtitle s) const
113 return ContentTimePeriod (
114 ContentTime::from_seconds (s.from.all_as_seconds()),
115 ContentTime::from_seconds (s.to.all_as_seconds())
120 TextSubtitleDecoder::reset ()