2 Copyright (C) 2012-2016 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 "raw_image_proxy.h"
25 #include "compose.hpp"
33 using std::back_inserter;
34 using boost::shared_ptr;
35 using boost::optional;
37 VideoDecoder::VideoDecoder (Decoder* parent, shared_ptr<const Content> c, shared_ptr<Log> log)
38 #ifdef DCPOMATIC_DEBUG
47 , _last_seek_accurate (true)
48 , _ignore_video (false)
50 _black_image.reset (new Image (AV_PIX_FMT_RGB24, _video_content->video->size(), true));
51 _black_image->make_black ();
55 VideoDecoder::decoded_video (Frame frame)
57 list<ContentVideo> output;
59 for (list<ContentVideo>::const_iterator i = _decoded_video.begin(); i != _decoded_video.end(); ++i) {
60 if (i->frame == frame) {
61 output.push_back (*i);
68 /** Get all frames which exist in the content at a given frame index.
69 * @param frame Frame index.
70 * @param accurate true to try hard to return frames at the precise time that was requested, otherwise frames nearby may be returned.
71 * @return Frames; there may be none (if there is no video there), 1 for 2D or 2 for 3D.
74 VideoDecoder::get_video (Frame frame, bool accurate)
76 if (_no_data_frame && frame >= _no_data_frame.get()) {
77 return list<ContentVideo> ();
80 /* At this stage, if we have get_video()ed before, _decoded_video will contain the last frame that this
81 method returned (and possibly a few more). If the requested frame is not in _decoded_video and it is not the next
82 one after the end of _decoded_video we need to seek.
85 _log->log (String::compose ("VD has request for %1", frame), LogEntry::TYPE_DEBUG_DECODE);
87 if (_decoded_video.empty() || frame < _decoded_video.front().frame || frame > (_decoded_video.back().frame + 1)) {
88 seek (ContentTime::from_frames (frame, _video_content->active_video_frame_rate()), accurate);
91 list<ContentVideo> dec;
93 /* Now enough pass() calls should either:
94 * (a) give us what we want, or
95 * (b) give us something after what we want, indicating that we will never get what we want, or
96 * (c) hit the end of the decoder.
99 /* We are being accurate, so we want the right frame.
100 * This could all be one statement but it's split up for clarity.
102 bool no_data = false;
105 if (!decoded_video(frame).empty ()) {
106 /* We got what we want */
110 if (_parent->pass (Decoder::PASS_REASON_VIDEO, accurate)) {
111 /* The decoder has nothing more for us */
116 if (!_decoded_video.empty() && _decoded_video.front().frame > frame) {
117 /* We're never going to get the frame we want. Perhaps the caller is asking
118 * for a video frame before the content's video starts (if its audio
119 * begins before its video, for example).
125 dec = decoded_video (frame);
127 if (no_data && dec.empty()) {
128 _no_data_frame = frame;
132 /* Any frame will do: use the first one that comes out of pass() */
133 while (_decoded_video.empty() && !_parent->pass (Decoder::PASS_REASON_VIDEO, accurate)) {}
134 if (!_decoded_video.empty ()) {
135 dec.push_back (_decoded_video.front ());
139 /* Clean up _decoded_video; keep the frame we are returning, if any (which may have two images
140 for 3D), but nothing before that */
141 while (!_decoded_video.empty() && !dec.empty() && _decoded_video.front().frame < dec.front().frame) {
142 _decoded_video.pop_front ();
148 /** Fill _decoded_video from `from' up to, but not including, `to' with
149 * a frame for one particular Eyes value (which could be EYES_BOTH,
150 * EYES_LEFT or EYES_RIGHT)
153 VideoDecoder::fill_one_eye (Frame from, Frame to, Eyes eye)
160 /* Fill with black... */
161 shared_ptr<const ImageProxy> filler_image (new RawImageProxy (_black_image));
162 Part filler_part = PART_WHOLE;
164 /* ...unless there's some video we can fill with */
165 if (!_decoded_video.empty ()) {
166 filler_image = _decoded_video.back().image;
167 filler_part = _decoded_video.back().part;
170 for (Frame i = from; i < to; ++i) {
171 #ifdef DCPOMATIC_DEBUG
174 _decoded_video.push_back (
175 ContentVideo (filler_image, eye, filler_part, i)
180 /** Fill _decoded_video from `from' up to, but not including, `to'
181 * adding both left and right eye frames.
184 VideoDecoder::fill_both_eyes (Frame from, Frame to, Eyes eye)
186 if (to == 0 && eye == EYES_LEFT) {
191 /* Fill with black... */
192 shared_ptr<const ImageProxy> filler_left_image (new RawImageProxy (_black_image));
193 shared_ptr<const ImageProxy> filler_right_image (new RawImageProxy (_black_image));
194 Part filler_left_part = PART_WHOLE;
195 Part filler_right_part = PART_WHOLE;
197 /* ...unless there's some video we can fill with */
198 for (list<ContentVideo>::const_reverse_iterator i = _decoded_video.rbegin(); i != _decoded_video.rend(); ++i) {
199 if (i->eyes == EYES_LEFT && !filler_left_image) {
200 filler_left_image = i->image;
201 filler_left_part = i->part;
202 } else if (i->eyes == EYES_RIGHT && !filler_right_image) {
203 filler_right_image = i->image;
204 filler_right_part = i->part;
207 if (filler_left_image && filler_right_image) {
212 Frame filler_frame = from;
213 Eyes filler_eye = _decoded_video.empty() ? EYES_LEFT : _decoded_video.back().eyes;
215 if (_decoded_video.empty ()) {
217 filler_eye = EYES_LEFT;
218 } else if (_decoded_video.back().eyes == EYES_LEFT) {
219 filler_frame = _decoded_video.back().frame;
220 filler_eye = EYES_RIGHT;
221 } else if (_decoded_video.back().eyes == EYES_RIGHT) {
222 filler_frame = _decoded_video.back().frame + 1;
223 filler_eye = EYES_LEFT;
226 while (filler_frame != to || filler_eye != eye) {
228 #ifdef DCPOMATIC_DEBUG
232 _decoded_video.push_back (
234 filler_eye == EYES_LEFT ? filler_left_image : filler_right_image,
236 filler_eye == EYES_LEFT ? filler_left_part : filler_right_part,
241 if (filler_eye == EYES_LEFT) {
242 filler_eye = EYES_RIGHT;
244 filler_eye = EYES_LEFT;
250 /** Called by subclasses when they have a video frame ready */
252 VideoDecoder::video (shared_ptr<const ImageProxy> image, Frame frame)
258 _log->log (String::compose ("VD receives %1", frame), LogEntry::TYPE_DEBUG_DECODE);
260 /* Work out what we are going to push into _decoded_video next */
261 list<ContentVideo> to_push;
262 switch (_video_content->video->frame_type ()) {
263 case VIDEO_FRAME_TYPE_2D:
264 to_push.push_back (ContentVideo (image, EYES_BOTH, PART_WHOLE, frame));
266 case VIDEO_FRAME_TYPE_3D_ALTERNATE:
268 /* We receive the same frame index twice for 3D-alternate; hence we know which
271 bool const same = (!_decoded_video.empty() && frame == _decoded_video.back().frame);
272 to_push.push_back (ContentVideo (image, same ? EYES_RIGHT : EYES_LEFT, PART_WHOLE, frame));
275 case VIDEO_FRAME_TYPE_3D_LEFT_RIGHT:
276 to_push.push_back (ContentVideo (image, EYES_LEFT, PART_LEFT_HALF, frame));
277 to_push.push_back (ContentVideo (image, EYES_RIGHT, PART_RIGHT_HALF, frame));
279 case VIDEO_FRAME_TYPE_3D_TOP_BOTTOM:
280 to_push.push_back (ContentVideo (image, EYES_LEFT, PART_TOP_HALF, frame));
281 to_push.push_back (ContentVideo (image, EYES_RIGHT, PART_BOTTOM_HALF, frame));
283 case VIDEO_FRAME_TYPE_3D_LEFT:
284 to_push.push_back (ContentVideo (image, EYES_LEFT, PART_WHOLE, frame));
286 case VIDEO_FRAME_TYPE_3D_RIGHT:
287 to_push.push_back (ContentVideo (image, EYES_RIGHT, PART_WHOLE, frame));
290 DCPOMATIC_ASSERT (false);
293 /* Now VideoDecoder is required never to have gaps in the frames that it presents
294 via get_video(). Hence we need to fill in any gap between the last thing in _decoded_video
295 and the things we are about to push.
298 optional<Frame> from;
301 if (_decoded_video.empty() && _last_seek_time && _last_seek_accurate) {
302 from = _last_seek_time->frames_round (_video_content->active_video_frame_rate ());
303 to = to_push.front().frame;
304 } else if (!_decoded_video.empty ()) {
305 from = _decoded_video.back().frame + 1;
306 to = to_push.front().frame;
309 /* If we've pre-rolled on a seek we may now receive out-of-order frames
310 (frames before the last seek time) which we can just ignore.
313 if (from && to && from.get() > to.get()) {
318 switch (_video_content->video->frame_type ()) {
319 case VIDEO_FRAME_TYPE_2D:
320 fill_one_eye (from.get(), to.get (), EYES_BOTH);
322 case VIDEO_FRAME_TYPE_3D_LEFT_RIGHT:
323 case VIDEO_FRAME_TYPE_3D_TOP_BOTTOM:
324 case VIDEO_FRAME_TYPE_3D_ALTERNATE:
325 fill_both_eyes (from.get(), to.get(), to_push.front().eyes);
327 case VIDEO_FRAME_TYPE_3D_LEFT:
328 fill_one_eye (from.get(), to.get (), EYES_LEFT);
330 case VIDEO_FRAME_TYPE_3D_RIGHT:
331 fill_one_eye (from.get(), to.get (), EYES_RIGHT);
336 copy (to_push.begin(), to_push.end(), back_inserter (_decoded_video));
338 /* We can't let this build up too much or we will run out of memory. There is a
339 `best' value for the allowed size of _decoded_video which balances memory use
340 with decoding efficiency (lack of seeks). Throwing away video frames here
341 is not a problem for correctness, so do it.
343 while (_decoded_video.size() > 96) {
344 _decoded_video.pop_back ();
349 VideoDecoder::seek (ContentTime s, bool accurate)
351 _decoded_video.clear ();
353 _last_seek_accurate = accurate;
356 /** Set this player never to produce any video data */
358 VideoDecoder::set_ignore_video ()
360 _ignore_video = true;