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 "raw_image_proxy.h"
33 using std::back_inserter;
34 using boost::shared_ptr;
35 using boost::optional;
37 VideoDecoder::VideoDecoder (shared_ptr<const VideoContent> c)
38 #ifdef DCPOMATIC_DEBUG
44 , _last_seek_accurate (true)
46 _black_image.reset (new Image (PIX_FMT_RGB24, _video_content->video_size(), true));
47 _black_image->make_black ();
51 VideoDecoder::decoded_video (VideoFrame frame)
53 list<ContentVideo> output;
55 for (list<ContentVideo>::const_iterator i = _decoded_video.begin(); i != _decoded_video.end(); ++i) {
56 if (i->frame == frame) {
57 output.push_back (*i);
64 /** Get all frames which exist in the content at a given frame index.
65 * @param frame Frame index.
66 * @param accurate true to try hard to return frames at the precise time that was requested, otherwise frames nearby may be returned.
67 * @return Frames; there may be none (if there is no video there), 1 for 2D or 2 for 3D.
70 VideoDecoder::get_video (VideoFrame frame, bool accurate)
72 /* At this stage, if we have get_video()ed before, _decoded_video will contain the last frame that this
73 method returned (and possibly a few more). If the requested frame is not in _decoded_video and it is not the next
74 one after the end of _decoded_video we need to seek.
77 if (_decoded_video.empty() || frame < _decoded_video.front().frame || frame > (_decoded_video.back().frame + 1)) {
78 seek (ContentTime::from_frames (frame, _video_content->video_frame_rate()), accurate);
81 list<ContentVideo> dec;
83 /* Now enough pass() calls should either:
84 * (a) give us what we want, or
85 * (b) give us something after what we want, indicating that we will never get what we want, or
86 * (c) hit the end of the decoder.
89 /* We are being accurate, so we want the right frame.
90 * This could all be one statement but it's split up for clarity.
93 if (!decoded_video(frame).empty ()) {
94 /* We got what we want */
99 /* The decoder has nothing more for us */
103 if (!_decoded_video.empty() && _decoded_video.front().frame > frame) {
104 /* We're never going to get the frame we want. Perhaps the caller is asking
105 * for a video frame before the content's video starts (if its audio
106 * begins before its video, for example).
112 dec = decoded_video (frame);
114 /* Any frame will do: use the first one that comes out of pass() */
115 while (_decoded_video.empty() && !pass ()) {}
116 if (!_decoded_video.empty ()) {
117 dec.push_back (_decoded_video.front ());
121 /* Clean up _decoded_video; keep the frame we are returning (which may have two images
122 for 3D), but nothing before that */
123 while (!_decoded_video.empty() && _decoded_video.front().frame < dec.front().frame) {
124 _decoded_video.pop_front ();
130 /** Fill _decoded_video from `from' up to, but not including, `to' */
132 VideoDecoder::fill_2d (VideoFrame from, VideoFrame to)
139 /* Fill with black... */
140 boost::shared_ptr<const ImageProxy> filler_image (new RawImageProxy (_black_image));
141 Part filler_part = PART_WHOLE;
143 /* ...unless there's some video we can fill with */
144 if (!_decoded_video.empty ()) {
145 filler_image = _decoded_video.back().image;
146 filler_part = _decoded_video.back().part;
149 VideoFrame filler_frame = from;
151 while (filler_frame < to) {
153 #ifdef DCPOMATIC_DEBUG
156 _decoded_video.push_back (
157 ContentVideo (filler_image, EYES_BOTH, filler_part, filler_frame)
164 /** Fill _decoded_video from `from' up to, but not including, `to' */
166 VideoDecoder::fill_3d (VideoFrame from, VideoFrame to, Eyes eye)
168 if (to == 0 && eye == EYES_LEFT) {
173 /* Fill with black... */
174 boost::shared_ptr<const ImageProxy> filler_left_image (new RawImageProxy (_black_image));
175 boost::shared_ptr<const ImageProxy> filler_right_image (new RawImageProxy (_black_image));
176 Part filler_left_part = PART_WHOLE;
177 Part filler_right_part = PART_WHOLE;
179 /* ...unless there's some video we can fill with */
180 for (list<ContentVideo>::const_reverse_iterator i = _decoded_video.rbegin(); i != _decoded_video.rend(); ++i) {
181 if (i->eyes == EYES_LEFT && !filler_left_image) {
182 filler_left_image = i->image;
183 filler_left_part = i->part;
184 } else if (i->eyes == EYES_RIGHT && !filler_right_image) {
185 filler_right_image = i->image;
186 filler_right_part = i->part;
189 if (filler_left_image && filler_right_image) {
194 VideoFrame filler_frame = from;
195 Eyes filler_eye = _decoded_video.empty() ? EYES_LEFT : _decoded_video.back().eyes;
197 if (_decoded_video.empty ()) {
199 filler_eye = EYES_LEFT;
200 } else if (_decoded_video.back().eyes == EYES_LEFT) {
201 filler_frame = _decoded_video.back().frame;
202 filler_eye = EYES_RIGHT;
203 } else if (_decoded_video.back().eyes == EYES_RIGHT) {
204 filler_frame = _decoded_video.back().frame + 1;
205 filler_eye = EYES_LEFT;
208 while (filler_frame != to || filler_eye != eye) {
210 #ifdef DCPOMATIC_DEBUG
214 _decoded_video.push_back (
216 filler_eye == EYES_LEFT ? filler_left_image : filler_right_image,
218 filler_eye == EYES_LEFT ? filler_left_part : filler_right_part,
223 if (filler_eye == EYES_LEFT) {
224 filler_eye = EYES_RIGHT;
226 filler_eye = EYES_LEFT;
232 /** Called by subclasses when they have a video frame ready */
234 VideoDecoder::video (shared_ptr<const ImageProxy> image, VideoFrame frame)
236 /* We may receive the same frame index twice for 3D, and we need to know
239 bool const same = (!_decoded_video.empty() && frame == _decoded_video.back().frame);
241 /* Work out what we are going to push into _decoded_video next */
242 list<ContentVideo> to_push;
243 switch (_video_content->video_frame_type ()) {
244 case VIDEO_FRAME_TYPE_2D:
245 to_push.push_back (ContentVideo (image, EYES_BOTH, PART_WHOLE, frame));
247 case VIDEO_FRAME_TYPE_3D_ALTERNATE:
248 to_push.push_back (ContentVideo (image, same ? EYES_RIGHT : EYES_LEFT, PART_WHOLE, frame));
250 case VIDEO_FRAME_TYPE_3D_LEFT_RIGHT:
251 to_push.push_back (ContentVideo (image, EYES_LEFT, PART_LEFT_HALF, frame));
252 to_push.push_back (ContentVideo (image, EYES_RIGHT, PART_RIGHT_HALF, frame));
254 case VIDEO_FRAME_TYPE_3D_TOP_BOTTOM:
255 to_push.push_back (ContentVideo (image, EYES_LEFT, PART_TOP_HALF, frame));
256 to_push.push_back (ContentVideo (image, EYES_RIGHT, PART_BOTTOM_HALF, frame));
258 case VIDEO_FRAME_TYPE_3D_LEFT:
259 to_push.push_back (ContentVideo (image, EYES_LEFT, PART_WHOLE, frame));
261 case VIDEO_FRAME_TYPE_3D_RIGHT:
262 to_push.push_back (ContentVideo (image, EYES_RIGHT, PART_WHOLE, frame));
265 DCPOMATIC_ASSERT (false);
268 /* Now VideoDecoder is required never to have gaps in the frames that it presents
269 via get_video(). Hence we need to fill in any gap between the last thing in _decoded_video
270 and the things we are about to push.
273 boost::optional<VideoFrame> from;
274 boost::optional<VideoFrame> to;
276 if (_decoded_video.empty() && _last_seek_time && _last_seek_accurate) {
277 from = _last_seek_time->frames (_video_content->video_frame_rate ());
278 to = to_push.front().frame;
279 } else if (!_decoded_video.empty ()) {
280 from = _decoded_video.back().frame + 1;
281 to = to_push.front().frame;
284 /* It has been known that this method receives frames out of order; at this
285 point I'm not sure why, but we'll just ignore them.
288 if (from && to && from.get() > to.get()) {
289 _video_content->film()->log()->log (
290 String::compose ("Ignoring out-of-order decoded frame %1 after %2", to.get(), from.get()), Log::TYPE_WARNING
296 if (_video_content->video_frame_type() == VIDEO_FRAME_TYPE_2D) {
297 fill_2d (from.get(), to.get ());
299 fill_3d (from.get(), to.get(), to_push.front().eyes);
303 copy (to_push.begin(), to_push.end(), back_inserter (_decoded_video));
305 /* We can't let this build up too much or we will run out of memory. We need to allow
306 the most frames that can exist between blocks of sound in a multiplexed file.
308 DCPOMATIC_ASSERT (_decoded_video.size() <= 96);
312 VideoDecoder::seek (ContentTime s, bool accurate)
314 _decoded_video.clear ();
316 _last_seek_accurate = accurate;