2 Copyright (C) 2013-2016 Carl Hetherington <cth@carlh.net>
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 #include "subtitle_decoder.h"
21 #include "subtitle_content.h"
22 #include <boost/shared_ptr.hpp>
23 #include <boost/foreach.hpp>
28 using boost::shared_ptr;
29 using boost::optional;
30 using boost::function;
32 SubtitleDecoder::SubtitleDecoder (
34 shared_ptr<const SubtitleContent> c,
35 function<list<ContentTimePeriod> (ContentTimePeriod, bool)> image_during,
36 function<list<ContentTimePeriod> (ContentTimePeriod, bool)> text_during
40 , _image_during (image_during)
41 , _text_during (text_during)
46 /** Called by subclasses when an image subtitle is ready.
47 * @param period Period of the subtitle.
48 * @param image Subtitle image.
49 * @param rect Area expressed as a fraction of the video frame that this subtitle
50 * is for (e.g. a width of 0.5 means the width of the subtitle is half the width
54 SubtitleDecoder::give_image (ContentTimePeriod period, shared_ptr<Image> image, dcpomatic::Rect<double> rect)
56 _decoded_image.push_back (ContentImageSubtitle (period, image, rect));
60 SubtitleDecoder::give_text (ContentTimePeriod period, list<dcp::SubtitleString> s)
62 _decoded_text.push_back (ContentTextSubtitle (period, s));
65 /** @param sp Full periods of subtitles that are showing or starting during the specified period */
68 SubtitleDecoder::get (list<T> const & subs, list<ContentTimePeriod> const & sp, ContentTimePeriod period, bool starting, bool accurate)
71 /* Nothing in this period */
75 /* Seek if what we want is before what we have, or a more than a little bit after */
76 if (subs.empty() || sp.back().to < subs.front().period().from || sp.front().from > (subs.back().period().to + ContentTime::from_seconds (1))) {
77 _parent->seek (sp.front().from, true);
80 /* Now enough pass() calls will either:
81 * (a) give us what we want, or
82 * (b) hit the end of the decoder.
84 while (!_parent->pass(Decoder::PASS_REASON_SUBTITLE, accurate) && (subs.empty() || (subs.back().period().to < sp.back().to))) {}
86 /* Now look for what we wanted in the data we have collected */
87 /* XXX: inefficient */
90 for (typename list<T>::const_iterator i = subs.begin(); i != subs.end(); ++i) {
91 if ((starting && period.contains (i->period().from)) || (!starting && period.overlaps (i->period ()))) {
96 /* Discard anything in _decoded_image_subtitles that is outside 5 seconds either side of period */
98 list<ContentImageSubtitle>::iterator i = _decoded_image.begin();
99 while (i != _decoded_image.end()) {
100 list<ContentImageSubtitle>::iterator tmp = i;
104 i->period().to < (period.from - ContentTime::from_seconds (5)) ||
105 i->period().from > (period.to + ContentTime::from_seconds (5))
107 _decoded_image.erase (i);
116 list<ContentTextSubtitle>
117 SubtitleDecoder::get_text (ContentTimePeriod period, bool starting, bool accurate)
119 return get<ContentTextSubtitle> (_decoded_text, _text_during (period, starting), period, starting, accurate);
122 list<ContentImageSubtitle>
123 SubtitleDecoder::get_image (ContentTimePeriod period, bool starting, bool accurate)
125 return get<ContentImageSubtitle> (_decoded_image, _image_during (period, starting), period, starting, accurate);
129 SubtitleDecoder::seek (ContentTime, bool)
131 _decoded_text.clear ();
132 _decoded_image.clear ();