- /* 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<VideoFrame> from;
-
- if (_decoded.empty() && _last_seek_time && _last_seek_accurate) {
- from = VideoFrame (
- _last_seek_time->frames_round (_content->active_video_frame_rate ()),
- _content->video->frame_type() == VIDEO_FRAME_TYPE_2D ? EYES_BOTH : EYES_LEFT
- );
- } else if (!_decoded.empty ()) {
- from = _decoded.back().frame;
- ++(*from);
- }
-
- /* 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 && (*from) > to_push.front().frame) {
- return;
- }
-
- int const max_decoded_size = 96;
-
- /* If _decoded is already `full' there is no point in adding anything more to it,
- as the new stuff will just be removed again.
- */
- if (_decoded.size() < max_decoded_size) {
- if (from) {
- switch (_content->video->frame_type ()) {
- case VIDEO_FRAME_TYPE_2D:
- fill_one_eye (from->index(), to_push.front().frame.index(), 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.get(), to_push.front().frame);
- break;
- case VIDEO_FRAME_TYPE_3D_LEFT:
- fill_one_eye (from->index(), to_push.front().frame.index(), EYES_LEFT);
- break;
- case VIDEO_FRAME_TYPE_3D_RIGHT:
- fill_one_eye (from->index(), to_push.front().frame.index(), 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() > max_decoded_size) {
- _decoded.pop_back ();
- }
-}
-
-void
-VideoDecoder::seek (ContentTime s, bool accurate)
-{
- _decoded.clear ();
- _last_seek_time = s;
- _last_seek_accurate = accurate;