/*
- Copyright (C) 2012-2014 Carl Hetherington <cth@carlh.net>
+ Copyright (C) 2012-2016 Carl Hetherington <cth@carlh.net>
- This program is free software; you can redistribute it and/or modify
+ This file is part of DCP-o-matic.
+
+ DCP-o-matic is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
- This program is distributed in the hope that it will be useful,
+ DCP-o-matic is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
*/
#include "video_decoder.h"
#include "image.h"
+#include "raw_image_proxy.h"
+#include "film.h"
+#include "log.h"
+#include "compose.hpp"
+#include <boost/foreach.hpp>
+#include <iostream>
#include "i18n.h"
using std::cout;
+using std::list;
+using std::max;
+using std::back_inserter;
using boost::shared_ptr;
+using boost::optional;
+
+VideoDecoder::VideoDecoder (Decoder* parent, shared_ptr<const Content> c, shared_ptr<Log> log)
+#ifdef DCPOMATIC_DEBUG
+ : test_gaps (0)
+ , _parent (parent),
+ _content (c)
+#else
+ : _parent (parent)
+ , _content (c)
+#endif
+ , _log (log)
+ , _last_seek_accurate (true)
+ , _ignore (false)
+{
+ _black_image.reset (new Image (AV_PIX_FMT_RGB24, _content->video->size(), true));
+ _black_image->make_black ();
+}
+
+list<ContentVideo>
+VideoDecoder::decoded (Frame frame)
+{
+ list<ContentVideo> output;
+
+ BOOST_FOREACH (ContentVideo const & i, _decoded) {
+ if (i.frame == frame) {
+ output.push_back (i);
+ }
+ }
+
+ return output;
+}
+
+/** Get all frames which exist in the content at a given frame index.
+ * @param frame Frame index.
+ * @param accurate true to try hard to return frames at the precise time that was requested, otherwise frames nearby may be returned.
+ * @return Frames; there may be none (if there is no video there), 1 for 2D or 2 for 3D.
+ */
+list<ContentVideo>
+VideoDecoder::get (Frame frame, bool accurate)
+{
+ if (_no_data_frame && frame >= _no_data_frame.get()) {
+ return list<ContentVideo> ();
+ }
+
+ /* At this stage, if we have get_video()ed before, _decoded will contain the last frame that this
+ method returned (and possibly a few more). If the requested frame is not in _decoded and it is not the next
+ one after the end of _decoded we need to seek.
+ */
+
+ _log->log (String::compose ("VD has request for %1", frame), LogEntry::TYPE_DEBUG_DECODE);
+
+ if (_decoded.empty() || frame < _decoded.front().frame || frame > (_decoded.back().frame + 1)) {
+ _parent->seek (ContentTime::from_frames (frame, _content->active_video_frame_rate()), accurate);
+ }
+
+ list<ContentVideo> dec;
+
+ /* Now enough pass() calls should either:
+ * (a) give us what we want, or
+ * (b) give us something after what we want, indicating that we will never get what we want, or
+ * (c) hit the end of the decoder.
+ */
+ if (accurate) {
+ /* We are being accurate, so we want the right frame.
+ * This could all be one statement but it's split up for clarity.
+ */
+ bool no_data = false;
+
+ while (true) {
+ if (!decoded(frame).empty ()) {
+ /* We got what we want */
+ break;
+ }
+
+ if (_parent->pass (Decoder::PASS_REASON_VIDEO, accurate)) {
+ /* The decoder has nothing more for us */
+ no_data = true;
+ break;
+ }
+
+ if (!_decoded.empty() && _decoded.front().frame > frame) {
+ /* We're never going to get the frame we want. Perhaps the caller is asking
+ * for a video frame before the content's video starts (if its audio
+ * begins before its video, for example).
+ */
+ break;
+ }
+ }
+
+ dec = decoded (frame);
+
+ if (no_data && dec.empty()) {
+ _no_data_frame = frame;
+ }
+
+ } else {
+ /* Any frame will do: use the first one that comes out of pass() */
+ while (_decoded.empty() && !_parent->pass (Decoder::PASS_REASON_VIDEO, accurate)) {}
+ if (!_decoded.empty ()) {
+ dec.push_back (_decoded.front ());
+ }
+ }
+
+ /* Clean up _decoded; keep the frame we are returning, if any (which may have two images
+ for 3D), but nothing before that */
+ while (!_decoded.empty() && !dec.empty() && _decoded.front().frame < dec.front().frame) {
+ _decoded.pop_front ();
+ }
+
+ return dec;
+}
+
+/** Fill _decoded from `from' up to, but not including, `to' with
+ * a frame for one particular Eyes value (which could be EYES_BOTH,
+ * EYES_LEFT or EYES_RIGHT)
+ */
+void
+VideoDecoder::fill_one_eye (Frame from, Frame to, Eyes eye)
+{
+ if (to == 0) {
+ /* Already OK */
+ return;
+ }
+
+ /* Fill with black... */
+ shared_ptr<const ImageProxy> filler_image (new RawImageProxy (_black_image));
+ Part filler_part = PART_WHOLE;
+
+ /* ...unless there's some video we can fill with */
+ if (!_decoded.empty ()) {
+ filler_image = _decoded.back().image;
+ filler_part = _decoded.back().part;
+ }
+
+ for (Frame i = from; i < to; ++i) {
+#ifdef DCPOMATIC_DEBUG
+ test_gaps++;
+#endif
+ _decoded.push_back (
+ ContentVideo (filler_image, eye, filler_part, i)
+ );
+ }
+}
-VideoDecoder::VideoDecoder (shared_ptr<const Film> f, shared_ptr<const VideoContent> c)
- : Decoder (f)
- , _video_content (c)
- , _video_position (0)
+/** Fill _decoded from `from' up to, but not including, `to'
+ * adding both left and right eye frames.
+ */
+void
+VideoDecoder::fill_both_eyes (Frame from, Frame to, Eyes eye)
{
+ if (to == 0 && eye == EYES_LEFT) {
+ /* Already OK */
+ return;
+ }
+
+ /* Fill with black... */
+ shared_ptr<const ImageProxy> filler_left_image (new RawImageProxy (_black_image));
+ shared_ptr<const ImageProxy> filler_right_image (new RawImageProxy (_black_image));
+ Part filler_left_part = PART_WHOLE;
+ Part filler_right_part = PART_WHOLE;
+ /* ...unless there's some video we can fill with */
+ for (list<ContentVideo>::const_reverse_iterator i = _decoded.rbegin(); i != _decoded.rend(); ++i) {
+ if (i->eyes == EYES_LEFT && !filler_left_image) {
+ filler_left_image = i->image;
+ filler_left_part = i->part;
+ } else if (i->eyes == EYES_RIGHT && !filler_right_image) {
+ filler_right_image = i->image;
+ filler_right_part = i->part;
+ }
+
+ if (filler_left_image && filler_right_image) {
+ break;
+ }
+ }
+
+ Frame filler_frame = from;
+ Eyes filler_eye = _decoded.empty() ? EYES_LEFT : _decoded.back().eyes;
+
+ if (_decoded.empty ()) {
+ filler_frame = 0;
+ filler_eye = EYES_LEFT;
+ } else if (_decoded.back().eyes == EYES_LEFT) {
+ filler_frame = _decoded.back().frame;
+ filler_eye = EYES_RIGHT;
+ } else if (_decoded.back().eyes == EYES_RIGHT) {
+ filler_frame = _decoded.back().frame + 1;
+ filler_eye = EYES_LEFT;
+ }
+
+ while (filler_frame != to || filler_eye != eye) {
+
+#ifdef DCPOMATIC_DEBUG
+ test_gaps++;
+#endif
+
+ _decoded.push_back (
+ ContentVideo (
+ filler_eye == EYES_LEFT ? filler_left_image : filler_right_image,
+ filler_eye,
+ filler_eye == EYES_LEFT ? filler_left_part : filler_right_part,
+ filler_frame
+ )
+ );
+
+ if (filler_eye == EYES_LEFT) {
+ filler_eye = EYES_RIGHT;
+ } else {
+ filler_eye = EYES_LEFT;
+ ++filler_frame;
+ }
+ }
}
+/** Called by decoder classes when they have a video frame ready */
void
-VideoDecoder::video (shared_ptr<const ImageProxy> image, bool same, VideoContent::Frame frame)
+VideoDecoder::give (shared_ptr<const ImageProxy> image, Frame frame)
{
- switch (_video_content->video_frame_type ()) {
+ if (_ignore) {
+ return;
+ }
+
+ _log->log (String::compose ("VD receives %1", frame), LogEntry::TYPE_DEBUG_DECODE);
+
+ /* Work out what we are going to push into _decoded next */
+ list<ContentVideo> to_push;
+ switch (_content->video->frame_type ()) {
case VIDEO_FRAME_TYPE_2D:
- Video (image, EYES_BOTH, PART_WHOLE, same, frame);
+ to_push.push_back (ContentVideo (image, EYES_BOTH, PART_WHOLE, frame));
break;
case VIDEO_FRAME_TYPE_3D_ALTERNATE:
- Video (image, (frame % 2) ? EYES_RIGHT : EYES_LEFT, PART_WHOLE, same, frame / 2);
+ {
+ /* We receive the same frame index twice for 3D-alternate; hence we know which
+ frame this one is.
+ */
+ bool const same = (!_decoded.empty() && frame == _decoded.back().frame);
+ to_push.push_back (ContentVideo (image, same ? EYES_RIGHT : EYES_LEFT, PART_WHOLE, frame));
break;
+ }
case VIDEO_FRAME_TYPE_3D_LEFT_RIGHT:
- Video (image, EYES_LEFT, PART_LEFT_HALF, same, frame);
- Video (image, EYES_RIGHT, PART_RIGHT_HALF, same, frame);
+ to_push.push_back (ContentVideo (image, EYES_LEFT, PART_LEFT_HALF, frame));
+ to_push.push_back (ContentVideo (image, EYES_RIGHT, PART_RIGHT_HALF, frame));
break;
case VIDEO_FRAME_TYPE_3D_TOP_BOTTOM:
- Video (image, EYES_LEFT, PART_TOP_HALF, same, frame);
- Video (image, EYES_RIGHT, PART_BOTTOM_HALF, same, frame);
+ to_push.push_back (ContentVideo (image, EYES_LEFT, PART_TOP_HALF, frame));
+ to_push.push_back (ContentVideo (image, EYES_RIGHT, PART_BOTTOM_HALF, frame));
break;
case VIDEO_FRAME_TYPE_3D_LEFT:
- Video (image, EYES_LEFT, PART_WHOLE, same, frame);
+ to_push.push_back (ContentVideo (image, EYES_LEFT, PART_WHOLE, frame));
break;
case VIDEO_FRAME_TYPE_3D_RIGHT:
- Video (image, EYES_RIGHT, PART_WHOLE, same, frame);
+ to_push.push_back (ContentVideo (image, EYES_RIGHT, PART_WHOLE, frame));
break;
+ default:
+ DCPOMATIC_ASSERT (false);
+ }
+
+ /* Now VideoDecoder is required never to have gaps in the frames that it presents
+ via get_video(). Hence we need to fill in any gap between the last thing in _decoded
+ and the things we are about to push.
+ */
+
+ optional<Frame> from;
+ optional<Frame> to;
+
+ if (_decoded.empty() && _last_seek_time && _last_seek_accurate) {
+ from = _last_seek_time->frames_round (_content->active_video_frame_rate ());
+ to = to_push.front().frame;
+ } else if (!_decoded.empty ()) {
+ from = _decoded.back().frame + 1;
+ to = to_push.front().frame;
+ }
+
+ /* If we've pre-rolled on a seek we may now receive out-of-order frames
+ (frames before the last seek time) which we can just ignore.
+ */
+
+ if (from && to && from.get() > to.get()) {
+ return;
+ }
+
+ if (from) {
+ switch (_content->video->frame_type ()) {
+ case VIDEO_FRAME_TYPE_2D:
+ fill_one_eye (from.get(), to.get (), EYES_BOTH);
+ break;
+ case VIDEO_FRAME_TYPE_3D_LEFT_RIGHT:
+ case VIDEO_FRAME_TYPE_3D_TOP_BOTTOM:
+ case VIDEO_FRAME_TYPE_3D_ALTERNATE:
+ fill_both_eyes (from.get(), to.get(), to_push.front().eyes);
+ break;
+ case VIDEO_FRAME_TYPE_3D_LEFT:
+ fill_one_eye (from.get(), to.get (), EYES_LEFT);
+ break;
+ case VIDEO_FRAME_TYPE_3D_RIGHT:
+ fill_one_eye (from.get(), to.get (), EYES_RIGHT);
+ break;
+ }
+ }
+
+ copy (to_push.begin(), to_push.end(), back_inserter (_decoded));
+
+ /* We can't let this build up too much or we will run out of memory. There is a
+ `best' value for the allowed size of _decoded which balances memory use
+ with decoding efficiency (lack of seeks). Throwing away video frames here
+ is not a problem for correctness, so do it.
+ */
+ while (_decoded.size() > 96) {
+ _decoded.pop_back ();
}
-
- _video_position = frame + 1;
}
+void
+VideoDecoder::seek (ContentTime s, bool accurate)
+{
+ _decoded.clear ();
+ _last_seek_time = s;
+ _last_seek_accurate = accurate;
+}
+
+/** Set this decoder never to produce any data */
+void
+VideoDecoder::set_ignore ()
+{
+ _ignore = true;
+}
projects / dcpomatic.git / blobdiff