Commit graph

54 commits

Author SHA1 Message Date
Mart Raudsepp
3d09a3b18a dvbsuboverlay: Implement subtitle queueing and syncing with video
Push incoming subtitle pages in a FIFO queue (pending_subtitles)
and dequeue the head when it's time to show it (when video running
time reaches the subtitle page running time).
Keep the subtitle page, that is supposed to be blended on top of video
currently, in a separate object variable (current_subtitle). As a
next step we can then pre-render current_subtitle to a better to blend
format.
2010-12-08 16:30:10 +01:00
Mart Raudsepp
7e2e52cab8 dvbsuboverlay: Pass page_time_out and pts with the DVBSubtitles structure
Eases holding onto the information in gst plugins side queue of
DVBSubtitles, so we won't need to create yet another temporary struct
to keep the pts and page_time_out too.
And this really logically belongs at the toplevel information set anyway
and in that struct...
2010-12-08 16:30:09 +01:00
Mart Raudsepp
4a68decb52 dvbsuboverlay: Work with GstClockTime instead of PTS for subtitle timing
Abuse libdvbsub PTS tracking to just store our running time in it, to get
it back in the callbacks. As GStreamer does its own PTS handling behind our
back (especially for video), we should just sync with video per running time,
not try to do it with PTS, which doesn't seem well accessible for video chain.
We can later relabel dvb-sub.c pts naming convention if wanted, it's just
passing along guint64 values, which GstClockTime fortunately is too.

The current idea is to collect the regions returned by the callback into
a FIFO buffer and pop and pre-render the top one into a separate
quick-to-blend cached format, which is then appropriately blended in the
video chain until the next one on top of the stack reaches the video chains
running time (or the fallback timer hits).
2010-12-08 16:30:09 +01:00
Mart Raudsepp
a8d891dc5e dvbsuboverlay: initial version, work in progress 2010-12-08 16:30:09 +01:00