+/** Fill _decoded_video 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_video.rbegin(); i != _decoded_video.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_video.empty() ? EYES_LEFT : _decoded_video.back().eyes;
+
+ if (_decoded_video.empty ()) {
+ filler_frame = 0;
+ filler_eye = EYES_LEFT;
+ } else if (_decoded_video.back().eyes == EYES_LEFT) {
+ filler_frame = _decoded_video.back().frame;
+ filler_eye = EYES_RIGHT;
+ } else if (_decoded_video.back().eyes == EYES_RIGHT) {
+ filler_frame = _decoded_video.back().frame + 1;
+ filler_eye = EYES_LEFT;
+ }
+
+ while (filler_frame != to || filler_eye != eye) {
+
+#ifdef DCPOMATIC_DEBUG
+ test_gaps++;
+#endif
+
+ _decoded_video.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 subclasses when they have a video frame ready */
+void
+VideoDecoder::video (shared_ptr<const ImageProxy> image, Frame frame)
+{
+ if (_ignore_video) {
+ return;
+ }
+
+ _video_content->film()->log()->log (String::compose ("VD receives %1", frame), LogEntry::TYPE_DEBUG_DECODE);
+
+ /* Work out what we are going to push into _decoded_video next */
+ list<ContentVideo> to_push;
+ switch (_video_content->video_frame_type ()) {
+ case VIDEO_FRAME_TYPE_2D:
+ to_push.push_back (ContentVideo (image, EYES_BOTH, PART_WHOLE, frame));
+ break;
+ case VIDEO_FRAME_TYPE_3D_ALTERNATE:
+ {
+ /* We receive the same frame index twice for 3D-alternate; hence we know which
+ frame this one is.
+ */
+ bool const same = (!_decoded_video.empty() && frame == _decoded_video.back().frame);
+ to_push.push_back (ContentVideo (image, same ? EYES_RIGHT : EYES_LEFT, PART_WHOLE, frame));
+ break;
+ }
+ case VIDEO_FRAME_TYPE_3D_LEFT_RIGHT:
+ 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:
+ 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:
+ to_push.push_back (ContentVideo (image, EYES_LEFT, PART_WHOLE, frame));
+ break;
+ case VIDEO_FRAME_TYPE_3D_RIGHT:
+ 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_video
+ and the things we are about to push.
+ */
+
+ optional<Frame> from;
+ optional<Frame> to;
+
+ if (_decoded_video.empty() && _last_seek_time && _last_seek_accurate) {
+ from = _last_seek_time->frames_round (_video_content->video_frame_rate ());
+ to = to_push.front().frame;
+ } else if (!_decoded_video.empty ()) {
+ from = _decoded_video.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 (_video_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_video));
+
+ /* 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_video 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_video.size() > 96) {
+ _decoded_video.pop_back ();
+ }
+}
+
+void
+VideoDecoder::seek (ContentTime s, bool accurate)
+{
+ _decoded_video.clear ();
+ _last_seek_time = s;
+ _last_seek_accurate = accurate;
+}
+
+/** Set this player never to produce any video data */
+void
+VideoDecoder::set_ignore_video ()
+{
+ _ignore_video = true;
+}