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"
29 using boost::shared_ptr;
30 using boost::optional;
32 VideoDecoder::VideoDecoder (shared_ptr<const Film> f)
35 , _last_source_time (0)
40 /** Called by subclasses to tell the world that some video data is ready.
41 * We find a subtitle then emit it for listeners.
42 * @param image frame to emit.
43 * @param t Time of the frame within the source, in seconds.
46 VideoDecoder::emit_video (shared_ptr<Image> image, double t)
48 shared_ptr<Subtitle> sub;
49 if (_timed_subtitle && _timed_subtitle->displayed_at (t)) {
50 sub = _timed_subtitle->subtitle ();
53 signal_video (image, false, sub, t);
57 VideoDecoder::have_last_video () const
62 /** Called by subclasses to repeat the last video frame that we
63 * passed to emit_video(). If emit_video hasn't yet been called,
64 * we will generate a black frame.
67 VideoDecoder::repeat_last_video (double t)
70 _last_image.reset (new SimpleImage (pixel_format(), native_size(), true));
71 _last_image->make_black ();
74 signal_video (_last_image, true, _last_subtitle, t);
77 /** Emit our signal to say that some video data is ready.
78 * @param image Video frame.
79 * @param same true if `image' is the same as the last one we emitted.
80 * @param sub Subtitle for this frame, or 0.
83 VideoDecoder::signal_video (shared_ptr<Image> image, bool same, shared_ptr<Subtitle> sub, double t)
85 TIMING (N_("Decoder emits %1"), _video_frame);
86 Video (image, same, sub);
91 _last_source_time = t;
94 /** Set up the current subtitle. This will be put onto frames that
95 * fit within its time specification. s may be 0 to say that there
96 * is no current subtitle.
97 * @param s New current subtitle, or 0.
100 VideoDecoder::emit_subtitle (shared_ptr<TimedSubtitle> s)
104 if (_timed_subtitle) {
105 Position const p = _timed_subtitle->subtitle()->position ();
106 _timed_subtitle->subtitle()->set_position (Position (p.x - _film->crop().left, p.y - _film->crop().top));
111 VideoDecoder::set_progress (Job* j) const
115 if (_film->video_length()) {
116 j->set_progress (float (_video_frame) / _film->video_length());