- /* 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_frame;
- optional<Eyes> from_eye;
-
- if (_decoded.empty() && _last_seek_time && _last_seek_accurate) {
- from_frame = _last_seek_time->frames_round (_content->active_video_frame_rate ());
- from_eye = EYES_LEFT;
- } else if (!_decoded.empty ()) {
- switch (_content->video->frame_type()) {
- case VIDEO_FRAME_TYPE_2D:
- case VIDEO_FRAME_TYPE_3D_LEFT:
- case VIDEO_FRAME_TYPE_3D_RIGHT:
- from_frame = _decoded.back().frame + 1;
- break;
- case VIDEO_FRAME_TYPE_3D:
- case VIDEO_FRAME_TYPE_3D_LEFT_RIGHT:
- case VIDEO_FRAME_TYPE_3D_TOP_BOTTOM:
- case VIDEO_FRAME_TYPE_3D_ALTERNATE:
- /* Get the last frame that we have */
- from_frame = _decoded.back().frame;
- from_eye = _decoded.back().eyes;
- /* And increment */
- if (from_eye.get() == EYES_LEFT) {
- from_eye = EYES_RIGHT;
- } else {
- from_eye = EYES_LEFT;
- from_frame = from_frame.get() + 1;
- }
- }
- }
-
- /* 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_frame && from_frame.get() > to_push.front().frame) {
- return;
- }
-
- if (from_frame) {
- switch (_content->video->frame_type ()) {
- case VIDEO_FRAME_TYPE_2D:
- fill_one_eye (from_frame.get(), to_push.front().frame, EYES_BOTH);
- break;
- case VIDEO_FRAME_TYPE_3D:
- case VIDEO_FRAME_TYPE_3D_LEFT_RIGHT:
- case VIDEO_FRAME_TYPE_3D_TOP_BOTTOM:
- case VIDEO_FRAME_TYPE_3D_ALTERNATE:
- fill_both_eyes (from_frame.get(), from_eye.get(), to_push.front().frame, to_push.front().eyes);
- break;
- case VIDEO_FRAME_TYPE_3D_LEFT:
- fill_one_eye (from_frame.get(), to_push.front().frame, EYES_LEFT);
- break;
- case VIDEO_FRAME_TYPE_3D_RIGHT:
- fill_one_eye (from_frame.get(), to_push.front().frame, 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 ();
- }