2 Copyright (C) 2012 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 "video_decoder.h"
31 using boost::shared_ptr;
32 using boost::optional;
34 VideoDecoder::VideoDecoder (shared_ptr<Film> f, DecodeOptions o)
37 , _last_source_time (0)
42 /** Called by subclasses to tell the world that some video data is ready.
43 * We find a subtitle then emit it for listeners.
44 * @param image frame to emit.
45 * @param t Time of the frame within the source, in seconds.
48 VideoDecoder::emit_video (shared_ptr<Image> image, bool same, double t)
50 shared_ptr<Subtitle> sub;
51 if (_timed_subtitle && _timed_subtitle->displayed_at (t)) {
52 sub = _timed_subtitle->subtitle ();
55 Video (image, same, sub, t);
58 _last_source_time = t;
61 /** Set up the current subtitle. This will be put onto frames that
62 * fit within its time specification. s may be 0 to say that there
63 * is no current subtitle.
64 * @param s New current subtitle, or 0.
67 VideoDecoder::emit_subtitle (shared_ptr<TimedSubtitle> s)
71 if (_timed_subtitle) {
72 Position const p = _timed_subtitle->subtitle()->position ();
73 _timed_subtitle->subtitle()->set_position (Position (p.x - _film->crop().left, p.y - _film->crop().top));
77 /** Set which stream of subtitles we should use from our source.
78 * @param s Stream to use.
81 VideoDecoder::set_subtitle_stream (shared_ptr<SubtitleStream> s)
87 VideoDecoder::set_progress (Job* j) const
91 if (_film->length()) {
92 j->set_progress (float (_video_frame) / _film->length().get());