[Bug 704881] Partial ATSC_user_data and CEA-708 Closed Captions Support

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=704881
  GStreamer | gst-plugins-bad | git

--- Comment #4 from Steve Maynard <steve at secondstryke.com> 2013-12-09 22:15:22 UTC ---
Having just returned to this effort, I have not been able to perform the
required modifications to decodebin/uridecodebin/playbin to accept pads added
late or mpegvideoparse to deal with an additional sometimes pad.  I am adding
the respective patches to add CC decoding from user_data, cea708 decoding from
raw CC data into VTT, and the unapproved changes required to test these
patches.

The unapproved patch need not be reviewed as the maintainers already instructed
that it was not the way to go forward.

The ccdec patch includes the element required to convert ATSC video user_data
into CC packets for either cea608 or cea708 decoder consumption.  There is
currently no decoder for cea608.

The cea708 patch includes the element required to convert CC data packets into
WebVTT cue text and is required for WebKit to display CC text streams.  This
patch relies on the ccdec patch for the plugin and makefile.

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