2 Copyright (C) 2013-2016 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 "subtitle_decoder.h"
22 #include "subtitle_content.h"
23 #include <boost/shared_ptr.hpp>
24 #include <boost/foreach.hpp>
29 using boost::shared_ptr;
30 using boost::optional;
31 using boost::function;
33 SubtitleDecoder::SubtitleDecoder (
35 shared_ptr<const SubtitleContent> c,
36 function<list<ContentTimePeriod> (ContentTimePeriod, bool)> image_during,
37 function<list<ContentTimePeriod> (ContentTimePeriod, bool)> text_during
41 , _image_during (image_during)
42 , _text_during (text_during)
47 /** Called by subclasses when an image subtitle is ready.
48 * @param period Period of the subtitle.
49 * @param image Subtitle image.
50 * @param rect Area expressed as a fraction of the video frame that this subtitle
51 * is for (e.g. a width of 0.5 means the width of the subtitle is half the width
55 SubtitleDecoder::give_image (ContentTimePeriod period, shared_ptr<Image> image, dcpomatic::Rect<double> rect)
57 _decoded_image.push_back (ContentImageSubtitle (period, image, rect));
61 SubtitleDecoder::give_text (ContentTimePeriod period, list<dcp::SubtitleString> s)
63 _decoded_text.push_back (ContentTextSubtitle (period, s));
66 /** @param sp Full periods of subtitles that are showing or starting during the specified period */
69 SubtitleDecoder::get (list<T> const & subs, list<ContentTimePeriod> const & sp, ContentTimePeriod period, bool starting, bool accurate)
72 /* Nothing in this period */
76 /* Seek if what we want is before what we have, or a more than a little bit after */
77 if (subs.empty() || sp.back().to < subs.front().period().from || sp.front().from > (subs.back().period().to + ContentTime::from_seconds (1))) {
78 _parent->seek (sp.front().from, true);
81 /* Now enough pass() calls will either:
82 * (a) give us what we want, or
83 * (b) hit the end of the decoder.
85 while (!_parent->pass(Decoder::PASS_REASON_SUBTITLE, accurate) && (subs.empty() || (subs.back().period().to < sp.back().to))) {}
87 /* Now look for what we wanted in the data we have collected */
88 /* XXX: inefficient */
91 for (typename list<T>::const_iterator i = subs.begin(); i != subs.end(); ++i) {
92 if ((starting && period.contains (i->period().from)) || (!starting && period.overlaps (i->period ()))) {
97 /* Discard anything in _decoded_image_subtitles that is outside 5 seconds either side of period */
99 list<ContentImageSubtitle>::iterator i = _decoded_image.begin();
100 while (i != _decoded_image.end()) {
101 list<ContentImageSubtitle>::iterator tmp = i;
105 i->period().to < (period.from - ContentTime::from_seconds (5)) ||
106 i->period().from > (period.to + ContentTime::from_seconds (5))
108 _decoded_image.erase (i);
117 list<ContentTextSubtitle>
118 SubtitleDecoder::get_text (ContentTimePeriod period, bool starting, bool accurate)
120 return get<ContentTextSubtitle> (_decoded_text, _text_during (period, starting), period, starting, accurate);
123 list<ContentImageSubtitle>
124 SubtitleDecoder::get_image (ContentTimePeriod period, bool starting, bool accurate)
126 return get<ContentImageSubtitle> (_decoded_image, _image_during (period, starting), period, starting, accurate);
130 SubtitleDecoder::seek (ContentTime, bool)
132 _decoded_text.clear ();
133 _decoded_image.clear ();