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"
30 using boost::shared_ptr;
31 using boost::optional;
33 VideoDecoder::VideoDecoder (shared_ptr<Film> f, DecodeOptions o)
36 , _last_source_time (0)
41 /** Called by subclasses to tell the world that some video data is ready.
42 * We find a subtitle then emit it for listeners.
43 * @param image frame to emit.
44 * @param t Time of the frame within the source, in seconds.
47 VideoDecoder::emit_video (shared_ptr<Image> image, double t)
49 shared_ptr<Subtitle> sub;
50 if (_timed_subtitle && _timed_subtitle->displayed_at (t)) {
51 sub = _timed_subtitle->subtitle ();
54 signal_video (image, false, sub);
55 _last_source_time = t;
58 /** Called by subclasses to repeat the last video frame that we
59 * passed to emit_video(). If emit_video hasn't yet been called,
60 * we will generate a black frame.
63 VideoDecoder::repeat_last_video ()
66 _last_image.reset (new SimpleImage (pixel_format(), native_size(), true));
67 _last_image->make_black ();
70 signal_video (_last_image, true, _last_subtitle);
73 /** Emit our signal to say that some video data is ready.
74 * @param image Video frame.
75 * @param same true if `image' is the same as the last one we emitted.
76 * @param sub Subtitle for this frame, or 0.
79 VideoDecoder::signal_video (shared_ptr<Image> image, bool same, shared_ptr<Subtitle> sub)
81 TIMING (N_("Decoder emits %1"), _video_frame);
82 Video (image, same, sub);
89 /** Set up the current subtitle. This will be put onto frames that
90 * fit within its time specification. s may be 0 to say that there
91 * is no current subtitle.
92 * @param s New current subtitle, or 0.
95 VideoDecoder::emit_subtitle (shared_ptr<TimedSubtitle> s)
99 if (_timed_subtitle) {
100 Position const p = _timed_subtitle->subtitle()->position ();
101 _timed_subtitle->subtitle()->set_position (Position (p.x - _film->crop().left, p.y - _film->crop().top));
105 /** Set which stream of subtitles we should use from our source.
106 * @param s Stream to use.
109 VideoDecoder::set_subtitle_stream (shared_ptr<SubtitleStream> s)
111 _subtitle_stream = s;
115 VideoDecoder::set_progress (Job* j) const
119 if (_film->length()) {
120 j->set_progress (float (_video_frame) / _film->length().get());