2 Copyright (C) 2012-2016 Carl Hetherington <cth@carlh.net>
4 This file is part of DCP-o-matic.
6 DCP-o-matic is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 DCP-o-matic is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
21 #include "video_decoder.h"
23 #include "raw_image_proxy.h"
26 #include "compose.hpp"
27 #include <boost/foreach.hpp>
28 #include <boost/make_shared.hpp>
36 using std::back_inserter;
37 using boost::shared_ptr;
38 using boost::make_shared;
39 using boost::optional;
41 VideoDecoder::VideoDecoder (Decoder* parent, shared_ptr<const Content> c, shared_ptr<Log> log)
42 #ifdef DCPOMATIC_DEBUG
51 , _last_seek_accurate (true)
54 _black_image.reset (new Image (AV_PIX_FMT_RGB24, _content->video->size(), true));
55 _black_image->make_black ();
59 VideoDecoder::decoded (Frame frame)
61 list<ContentVideo> output;
63 BOOST_FOREACH (ContentVideo const & i, _decoded) {
64 if (i.frame.index() == frame) {
72 /** Get all frames which exist in the content at a given frame index.
73 * @param frame Frame index.
74 * @param accurate true to try hard to return frames at the precise time that was requested, otherwise frames nearby may be returned.
75 * @return Frames; there may be none (if there is no video there), 1 for 2D or 2 for 3D.
78 VideoDecoder::get (Frame frame, bool accurate)
80 if (_no_data_frame && frame >= _no_data_frame.get()) {
81 return list<ContentVideo> ();
84 /* At this stage, if we have get_video()ed before, _decoded will contain the last frame that this
85 method returned (and possibly a few more). If the requested frame is not in _decoded and it is not the next
86 one after the end of _decoded we need to seek.
89 _log->log (String::compose ("VD has request for %1", frame), LogEntry::TYPE_DEBUG_DECODE);
91 if (_decoded.empty() || frame < _decoded.front().frame.index() || frame > (_decoded.back().frame.index() + 1)) {
92 _parent->seek (ContentTime::from_frames (frame, _content->active_video_frame_rate()), accurate);
95 unsigned int const frames_wanted = _content->video->frame_type() == VIDEO_FRAME_TYPE_2D ? 1 : 2;
97 list<ContentVideo> dec;
99 /* Now enough pass() calls should either:
100 * (a) give us what we want, or
101 * (b) give us something after what we want, indicating that we will never get what we want, or
102 * (c) hit the end of the decoder.
105 /* We are being accurate, so we want the right frame.
106 * This could all be one statement but it's split up for clarity.
108 bool no_data = false;
111 if (decoded(frame).size() == frames_wanted) {
112 /* We got what we want */
116 if (_parent->pass (Decoder::PASS_REASON_VIDEO, accurate)) {
117 /* The decoder has nothing more for us */
122 if (!_decoded.empty() && _decoded.front().frame.index() > frame) {
123 /* We're never going to get the frame we want. Perhaps the caller is asking
124 * for a video frame before the content's video starts (if its audio
125 * begins before its video, for example).
131 dec = decoded (frame);
133 if (no_data && dec.empty()) {
134 _no_data_frame = frame;
138 /* Any frame(s) will do: use the first one(s) that comes out of pass() */
139 while (_decoded.size() < frames_wanted && !_parent->pass (Decoder::PASS_REASON_VIDEO, accurate)) {}
140 list<ContentVideo>::const_iterator i = _decoded.begin();
142 while (i != _decoded.end() && j < frames_wanted) {
149 /* Clean up _decoded; keep the frame we are returning, if any (which may have two images
150 for 3D), but nothing before that */
151 while (!_decoded.empty() && !dec.empty() && _decoded.front().frame.index() < dec.front().frame.index()) {
152 _decoded.pop_front ();
158 /** Fill _decoded from `from' up to, but not including, `to' with
159 * a frame for one particular Eyes value (which could be EYES_BOTH,
160 * EYES_LEFT or EYES_RIGHT)
163 VideoDecoder::fill_one_eye (Frame from, Frame to, Eyes eye)
170 /* Fill with black... */
171 shared_ptr<const ImageProxy> filler_image = make_shared<RawImageProxy> (_black_image);
172 Part filler_part = PART_WHOLE;
174 /* ...unless there's some video we can fill with */
175 if (!_decoded.empty ()) {
176 filler_image = _decoded.back().image;
177 filler_part = _decoded.back().part;
180 for (Frame i = from; i < to; ++i) {
181 #ifdef DCPOMATIC_DEBUG
185 ContentVideo (filler_image, VideoFrame (i, eye), filler_part)
190 /** Fill _decoded from `from' up to, but not including, `to'
191 * adding both left and right eye frames.
194 VideoDecoder::fill_both_eyes (VideoFrame from, VideoFrame to)
196 /* Fill with black... */
197 shared_ptr<const ImageProxy> filler_left_image = make_shared<RawImageProxy> (_black_image);
198 shared_ptr<const ImageProxy> filler_right_image = make_shared<RawImageProxy> (_black_image);
199 Part filler_left_part = PART_WHOLE;
200 Part filler_right_part = PART_WHOLE;
202 /* ...unless there's some video we can fill with */
203 for (list<ContentVideo>::const_reverse_iterator i = _decoded.rbegin(); i != _decoded.rend(); ++i) {
204 if (i->frame.eyes() == EYES_LEFT && !filler_left_image) {
205 filler_left_image = i->image;
206 filler_left_part = i->part;
207 } else if (i->frame.eyes() == EYES_RIGHT && !filler_right_image) {
208 filler_right_image = i->image;
209 filler_right_part = i->part;
212 if (filler_left_image && filler_right_image) {
219 #ifdef DCPOMATIC_DEBUG
225 from.eyes() == EYES_LEFT ? filler_left_image : filler_right_image,
227 from.eyes() == EYES_LEFT ? filler_left_part : filler_right_part
235 /** Called by decoder classes when they have a video frame ready */
237 VideoDecoder::give (shared_ptr<const ImageProxy> image, Frame frame)
243 _log->log (String::compose ("VD receives %1", frame), LogEntry::TYPE_DEBUG_DECODE);
245 /* Work out what we are going to push into _decoded next */
246 list<ContentVideo> to_push;
247 switch (_content->video->frame_type ()) {
248 case VIDEO_FRAME_TYPE_2D:
249 to_push.push_back (ContentVideo (image, VideoFrame (frame, EYES_BOTH), PART_WHOLE));
251 case VIDEO_FRAME_TYPE_3D:
252 case VIDEO_FRAME_TYPE_3D_ALTERNATE:
254 /* We receive the same frame index twice for 3D-alternate; hence we know which
257 bool const same = (!_decoded.empty() && frame == _decoded.back().frame.index());
258 to_push.push_back (ContentVideo (image, VideoFrame (frame, same ? EYES_RIGHT : EYES_LEFT), PART_WHOLE));
261 case VIDEO_FRAME_TYPE_3D_LEFT_RIGHT:
262 to_push.push_back (ContentVideo (image, VideoFrame (frame, EYES_LEFT), PART_LEFT_HALF));
263 to_push.push_back (ContentVideo (image, VideoFrame (frame, EYES_RIGHT), PART_RIGHT_HALF));
265 case VIDEO_FRAME_TYPE_3D_TOP_BOTTOM:
266 to_push.push_back (ContentVideo (image, VideoFrame (frame, EYES_LEFT), PART_TOP_HALF));
267 to_push.push_back (ContentVideo (image, VideoFrame (frame, EYES_RIGHT), PART_BOTTOM_HALF));
269 case VIDEO_FRAME_TYPE_3D_LEFT:
270 to_push.push_back (ContentVideo (image, VideoFrame (frame, EYES_LEFT), PART_WHOLE));
272 case VIDEO_FRAME_TYPE_3D_RIGHT:
273 to_push.push_back (ContentVideo (image, VideoFrame (frame, EYES_RIGHT), PART_WHOLE));
276 DCPOMATIC_ASSERT (false);
279 /* Now VideoDecoder is required never to have gaps in the frames that it presents
280 via get_video(). Hence we need to fill in any gap between the last thing in _decoded
281 and the things we are about to push.
284 optional<VideoFrame> from;
286 if (_decoded.empty() && _last_seek_time && _last_seek_accurate) {
288 _last_seek_time->frames_round (_content->active_video_frame_rate ()),
289 _content->video->frame_type() == VIDEO_FRAME_TYPE_2D ? EYES_BOTH : EYES_LEFT
291 } else if (!_decoded.empty ()) {
292 from = _decoded.back().frame;
296 /* If we've pre-rolled on a seek we may now receive out-of-order frames
297 (frames before the last seek time) which we can just ignore.
300 if (from && (*from) > to_push.front().frame) {
305 switch (_content->video->frame_type ()) {
306 case VIDEO_FRAME_TYPE_2D:
307 fill_one_eye (from->index(), to_push.front().frame.index(), EYES_BOTH);
309 case VIDEO_FRAME_TYPE_3D:
310 case VIDEO_FRAME_TYPE_3D_LEFT_RIGHT:
311 case VIDEO_FRAME_TYPE_3D_TOP_BOTTOM:
312 case VIDEO_FRAME_TYPE_3D_ALTERNATE:
313 fill_both_eyes (from.get(), to_push.front().frame);
315 case VIDEO_FRAME_TYPE_3D_LEFT:
316 fill_one_eye (from->index(), to_push.front().frame.index(), EYES_LEFT);
318 case VIDEO_FRAME_TYPE_3D_RIGHT:
319 fill_one_eye (from->index(), to_push.front().frame.index(), EYES_RIGHT);
324 copy (to_push.begin(), to_push.end(), back_inserter (_decoded));
326 /* We can't let this build up too much or we will run out of memory. There is a
327 `best' value for the allowed size of _decoded which balances memory use
328 with decoding efficiency (lack of seeks). Throwing away video frames here
329 is not a problem for correctness, so do it.
331 while (_decoded.size() > 96) {
332 _decoded.pop_back ();
337 VideoDecoder::seek (ContentTime s, bool accurate)
341 _last_seek_accurate = accurate;
344 /** Set this decoder never to produce any data */
346 VideoDecoder::set_ignore ()