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 "image_proxy.h"
23 #include "raw_image_proxy.h"
24 #include "content_video.h"
31 using std::back_inserter;
32 using boost::shared_ptr;
33 using boost::optional;
35 VideoDecoder::VideoDecoder (shared_ptr<const VideoContent> c)
36 #ifdef DCPOMATIC_DEBUG
43 , _last_seek_accurate (true)
45 _black_image.reset (new Image (PIX_FMT_RGB24, _video_content->video_size(), true));
46 _black_image->make_black ();
50 VideoDecoder::decoded_video (VideoFrame frame)
52 list<ContentVideo> output;
54 for (list<ContentVideo>::const_iterator i = _decoded_video.begin(); i != _decoded_video.end(); ++i) {
55 if (i->frame == frame) {
56 output.push_back (*i);
63 /** Get all frames which exist in the content at a given frame index.
64 * @param frame Frame index.
65 * @param accurate true to try hard to return frames at the precise time that was requested, otherwise frames nearby may be returned.
66 * @return Frames; there may be none (if there is no video there), 1 for 2D or 2 for 3D.
69 VideoDecoder::get_video (VideoFrame frame, bool accurate)
71 /* At this stage, if we have get_video()ed before, _decoded_video will contain the last frame that this
72 method returned (and possibly a few more). If the requested frame is not in _decoded_video and it is not the next
73 one after the end of _decoded_video we need to seek.
76 if (_decoded_video.empty() || frame < _decoded_video.front().frame || frame > (_decoded_video.back().frame + 1)) {
77 seek (ContentTime::from_frames (frame, _video_content->video_frame_rate()), accurate);
80 list<ContentVideo> dec;
82 /* Now enough pass() calls should either:
83 * (a) give us what we want, or
84 * (b) give us something after what we want, indicating that we will never get what we want, or
85 * (c) hit the end of the decoder.
88 /* We are being accurate, so we want the right frame.
89 * This could all be one statement but it's split up for clarity.
92 if (!decoded_video(frame).empty ()) {
93 /* We got what we want */
98 /* The decoder has nothing more for us */
102 if (!_decoded_video.empty() && _decoded_video.front().frame > frame) {
103 /* We're never going to get the frame we want. Perhaps the caller is asking
104 * for a video frame before the content's video starts (if its audio
105 * begins before its video, for example).
111 dec = decoded_video (frame);
113 /* Any frame will do: use the first one that comes out of pass() */
114 while (_decoded_video.empty() && !pass ()) {}
115 if (!_decoded_video.empty ()) {
116 dec.push_back (_decoded_video.front ());
120 /* Clean up _decoded_video; keep the frame we are returning (which may have two images
121 for 3D), but nothing before that */
122 while (!_decoded_video.empty() && _decoded_video.front().frame < dec.front().frame) {
123 _decoded_video.pop_front ();
129 /** Fill _decoded_video from `from' up to, but not including, `to' */
131 VideoDecoder::fill_2d (VideoFrame from, VideoFrame to)
138 /* Fill with black... */
139 boost::shared_ptr<const ImageProxy> filler_image (new RawImageProxy (_black_image));
140 Part filler_part = PART_WHOLE;
142 /* ...unless there's some video we can fill with */
143 if (!_decoded_video.empty ()) {
144 filler_image = _decoded_video.back().image;
145 filler_part = _decoded_video.back().part;
148 VideoFrame filler_frame = from;
150 while (filler_frame < to) {
152 #ifdef DCPOMATIC_DEBUG
155 _decoded_video.push_back (
156 ContentVideo (filler_image, EYES_BOTH, filler_part, filler_frame)
163 /** Fill _decoded_video from `from' up to, but not including, `to' */
165 VideoDecoder::fill_3d (VideoFrame from, VideoFrame to, Eyes eye)
167 if (to == 0 && eye == EYES_LEFT) {
172 /* Fill with black... */
173 boost::shared_ptr<const ImageProxy> filler_left_image (new RawImageProxy (_black_image));
174 boost::shared_ptr<const ImageProxy> filler_right_image (new RawImageProxy (_black_image));
175 Part filler_left_part = PART_WHOLE;
176 Part filler_right_part = PART_WHOLE;
178 /* ...unless there's some video we can fill with */
179 for (list<ContentVideo>::const_reverse_iterator i = _decoded_video.rbegin(); i != _decoded_video.rend(); ++i) {
180 if (i->eyes == EYES_LEFT && !filler_left_image) {
181 filler_left_image = i->image;
182 filler_left_part = i->part;
183 } else if (i->eyes == EYES_RIGHT && !filler_right_image) {
184 filler_right_image = i->image;
185 filler_right_part = i->part;
188 if (filler_left_image && filler_right_image) {
193 VideoFrame filler_frame = from;
194 Eyes filler_eye = _decoded_video.empty() ? EYES_LEFT : _decoded_video.back().eyes;
196 if (_decoded_video.empty ()) {
198 filler_eye = EYES_LEFT;
199 } else if (_decoded_video.back().eyes == EYES_LEFT) {
200 filler_frame = _decoded_video.back().frame;
201 filler_eye = EYES_RIGHT;
202 } else if (_decoded_video.back().eyes == EYES_RIGHT) {
203 filler_frame = _decoded_video.back().frame + 1;
204 filler_eye = EYES_LEFT;
207 while (filler_frame != to || filler_eye != eye) {
209 #ifdef DCPOMATIC_DEBUG
213 _decoded_video.push_back (
215 filler_eye == EYES_LEFT ? filler_left_image : filler_right_image,
217 filler_eye == EYES_LEFT ? filler_left_part : filler_right_part,
222 if (filler_eye == EYES_LEFT) {
223 filler_eye = EYES_RIGHT;
225 filler_eye = EYES_LEFT;
231 /** Called by subclasses when they have a video frame ready */
233 VideoDecoder::video (shared_ptr<const ImageProxy> image, VideoFrame frame)
235 /* We may receive the same frame index twice for 3D, and we need to know
238 _same = (!_decoded_video.empty() && frame == _decoded_video.back().frame);
240 /* Work out what we are going to push into _decoded_video next */
241 list<ContentVideo> to_push;
242 switch (_video_content->video_frame_type ()) {
243 case VIDEO_FRAME_TYPE_2D:
244 to_push.push_back (ContentVideo (image, EYES_BOTH, PART_WHOLE, frame));
246 case VIDEO_FRAME_TYPE_3D_ALTERNATE:
247 to_push.push_back (ContentVideo (image, _same ? EYES_RIGHT : EYES_LEFT, PART_WHOLE, frame));
249 case VIDEO_FRAME_TYPE_3D_LEFT_RIGHT:
250 to_push.push_back (ContentVideo (image, EYES_LEFT, PART_LEFT_HALF, frame));
251 to_push.push_back (ContentVideo (image, EYES_RIGHT, PART_RIGHT_HALF, frame));
253 case VIDEO_FRAME_TYPE_3D_TOP_BOTTOM:
254 to_push.push_back (ContentVideo (image, EYES_LEFT, PART_TOP_HALF, frame));
255 to_push.push_back (ContentVideo (image, EYES_RIGHT, PART_BOTTOM_HALF, frame));
257 case VIDEO_FRAME_TYPE_3D_LEFT:
258 to_push.push_back (ContentVideo (image, EYES_LEFT, PART_WHOLE, frame));
260 case VIDEO_FRAME_TYPE_3D_RIGHT:
261 to_push.push_back (ContentVideo (image, EYES_RIGHT, PART_WHOLE, frame));
264 DCPOMATIC_ASSERT (false);
267 /* Now VideoDecoder is required never to have gaps in the frames that it presents
268 via get_video(). Hence we need to fill in any gap between the last thing in _decoded_video
269 and the things we are about to push.
272 boost::optional<VideoFrame> from;
273 boost::optional<VideoFrame> to;
275 if (_decoded_video.empty() && _last_seek_time && _last_seek_accurate) {
276 from = _last_seek_time->frames (_video_content->video_frame_rate ());
277 to = to_push.front().frame;
278 } else if (!_decoded_video.empty ()) {
279 from = _decoded_video.back().frame + 1;
280 to = to_push.front().frame;
284 if (_video_content->video_frame_type() == VIDEO_FRAME_TYPE_2D) {
285 fill_2d (from.get(), to.get ());
287 fill_3d (from.get(), to.get(), to_push.front().eyes);
291 copy (to_push.begin(), to_push.end(), back_inserter (_decoded_video));
293 /* We can't let this build up too much or we will run out of memory */
294 DCPOMATIC_ASSERT (_decoded_video.size() < 32);
298 VideoDecoder::seek (ContentTime s, bool accurate)
300 _decoded_video.clear ();
302 _last_seek_accurate = accurate;