2 Copyright (C) 2012-2014 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 "video_decoder.h"
22 #include "content_video.h"
28 using boost::shared_ptr;
29 using boost::optional;
31 VideoDecoder::VideoDecoder (shared_ptr<const VideoContent> c)
32 #ifdef DCPOMATIC_DEBUG
43 VideoDecoder::decoded_video (VideoFrame frame)
45 list<ContentVideo> output;
47 for (list<ContentVideo>::const_iterator i = _decoded_video.begin(); i != _decoded_video.end(); ++i) {
48 if (i->frame == frame) {
49 output.push_back (*i);
57 VideoDecoder::get_video (VideoFrame frame, bool accurate)
59 if (_decoded_video.empty() || (frame < _decoded_video.front().frame || frame > (_decoded_video.back().frame + 1))) {
60 /* Either we have no decoded data, or what we do have is a long way from what we want: seek */
61 seek (ContentTime::from_frames (frame, _video_content->video_frame_rate()), accurate);
64 list<ContentVideo> dec;
66 /* Now enough pass() calls should either:
67 * (a) give us what we want, or
68 * (b) hit the end of the decoder.
71 /* We are being accurate, so we want the right frame.
72 * This could all be one statement but it's split up for clarity.
75 if (!decoded_video(frame).empty ()) {
76 /* We got what we want */
81 /* The decoder has nothing more for us */
85 if (!_decoded_video.empty() && _decoded_video.front().frame > frame) {
86 /* We're never going to get the frame we want. Perhaps the caller is asking
87 * for a video frame before the content's video starts (if its audio
88 * begins before its video, for example).
94 dec = decoded_video (frame);
96 /* Any frame will do: use the first one that comes out of pass() */
97 while (_decoded_video.empty() && !pass ()) {}
98 if (!_decoded_video.empty ()) {
99 dec.push_back (_decoded_video.front ());
103 /* Clean up decoded_video */
104 while (!_decoded_video.empty() && _decoded_video.front().frame < (frame - 1)) {
105 _decoded_video.pop_front ();
112 /** Called by subclasses when they have a video frame ready */
114 VideoDecoder::video (shared_ptr<const Image> image, VideoFrame frame)
116 /* We should not receive the same thing twice */
117 assert (_decoded_video.empty() || frame != _decoded_video.back().frame);
122 while (!_decoded_video.empty () && (_decoded_video.back().frame + 1) < frame) {
123 #ifdef DCPOMATIC_DEBUG
126 _decoded_video.push_back (
128 _decoded_video.back().image,
129 _decoded_video.back().eyes,
130 _decoded_video.back().frame + 1
135 switch (_video_content->video_frame_type ()) {
136 case VIDEO_FRAME_TYPE_2D:
137 _decoded_video.push_back (ContentVideo (image, EYES_BOTH, frame));
139 case VIDEO_FRAME_TYPE_3D_ALTERNATE:
140 _decoded_video.push_back (ContentVideo (image, (frame % 2) ? EYES_RIGHT : EYES_LEFT, frame));
142 case VIDEO_FRAME_TYPE_3D_LEFT_RIGHT:
144 int const half = image->size().width / 2;
145 _decoded_video.push_back (ContentVideo (image->crop (Crop (0, half, 0, 0), true), EYES_LEFT, frame));
146 _decoded_video.push_back (ContentVideo (image->crop (Crop (half, 0, 0, 0), true), EYES_RIGHT, frame));
149 case VIDEO_FRAME_TYPE_3D_TOP_BOTTOM:
151 int const half = image->size().height / 2;
152 _decoded_video.push_back (ContentVideo (image->crop (Crop (0, 0, 0, half), true), EYES_LEFT, frame));
153 _decoded_video.push_back (ContentVideo (image->crop (Crop (0, 0, half, 0), true), EYES_RIGHT, frame));
156 case VIDEO_FRAME_TYPE_3D_LEFT:
157 _decoded_video.push_back (ContentVideo (image, EYES_LEFT, frame));
159 case VIDEO_FRAME_TYPE_3D_RIGHT:
160 _decoded_video.push_back (ContentVideo (image, EYES_RIGHT, frame));
168 VideoDecoder::seek (ContentTime, bool)
170 _decoded_video.clear ();