2 Copyright (C) 2013-2014 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 <boost/shared_ptr.hpp>
21 #include "subtitle_decoder.h"
22 #include "subtitle_content.h"
26 using boost::shared_ptr;
27 using boost::optional;
29 SubtitleDecoder::SubtitleDecoder (shared_ptr<const SubtitleContent> c)
30 : _subtitle_content (c)
35 /** Called by subclasses when an image subtitle is ready.
36 * Image may be 0 to say that there is no current subtitle.
37 * @param rect Area expressed as a fraction of the video frame that this subtitle
38 * is for (e.g. a width of 0.5 means the width of the subtitle is half the width
42 SubtitleDecoder::image_subtitle (ContentTimePeriod period, shared_ptr<Image> image, dcpomatic::Rect<double> rect)
44 _decoded_image_subtitles.push_back (ContentImageSubtitle (period, image, rect));
48 SubtitleDecoder::text_subtitle (list<dcp::SubtitleString> s)
50 _decoded_text_subtitles.push_back (ContentTextSubtitle (s));
55 SubtitleDecoder::get (list<T> const & subs, ContentTimePeriod period, bool starting)
57 /* Get the full periods of the subtitles that are showing or starting during the specified period */
58 list<ContentTimePeriod> sp = subtitles_during (period, starting);
60 /* Nothing in this period */
64 /* Seek if what we want is before what we have, or more than a reasonable amount after */
65 if (subs.empty() || sp.back().to < subs.front().period().from || sp.front().from > (subs.back().period().to + ContentTime::from_seconds (5))) {
66 seek (sp.front().from, true);
69 /* Now enough pass() calls will either:
70 * (a) give us what we want, or
71 * (b) hit the end of the decoder.
73 while (!pass() && (subs.empty() || (subs.back().period().to < sp.back().to))) {}
75 /* Now look for what we wanted in the data we have collected */
76 /* XXX: inefficient */
79 for (typename list<T>::const_iterator i = subs.begin(); i != subs.end(); ++i) {
80 if ((starting && period.contains (i->period().from)) || (!starting && period.overlaps (i->period ()))) {
88 list<ContentTextSubtitle>
89 SubtitleDecoder::get_text_subtitles (ContentTimePeriod period, bool starting)
91 return get<ContentTextSubtitle> (_decoded_text_subtitles, period, starting);
94 list<ContentImageSubtitle>
95 SubtitleDecoder::get_image_subtitles (ContentTimePeriod period, bool starting)
97 return get<ContentImageSubtitle> (_decoded_image_subtitles, period, starting);
101 SubtitleDecoder::seek (ContentTime, bool)
103 _decoded_text_subtitles.clear ();
104 _decoded_image_subtitles.clear ();