- /* 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);
- }
- }
-
- 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 ();
- }