[mythtv] [experimental patch] vbi decoder for IVTV cards

[Stutty]

Have to admit I'm not using the latest CVS (lots of offsets when
applying patch) but, looks like some files missing from the patch?

e.g. On make I get (amongst others)
WARNING: Failure to find: vbidecoder.h
WARNING: Failure to find: vbilut.h
WARNING: Failure to find: osdtypeteletext.h
WARNING: Failure to find: vbidecoder.cpp
WARNING: Failure to find: osdtypeteletext.cpp

Paul


On Tue, 1 Mar 2005 22:47:58 +0100, Martin Barnasconi
<mythtv at barnasconi.net> wrote:
> Here the first experimental patch for the vbi decoding for PVR cards using the
> IVTV drivers. Although its far from perfect (that's why it's classified as
> experimental;-) it gives you some idea how things are implemented and I
> challenge you to contribute to fill in the missing gaps or to improve the
> code.
> 
> What it does:
> it relies on having embedded vbi in the MPEG stream as defined in the IVTV
> doc's. The embedded vbi stream includes the magic cookies "itv0' and 'ITV0'
> to mark the beginning of a vbi private stream. That's why some additional
> lines are added to the avformatdecoder and ffmpeg decoder classes, to
> recognize a vbi data steam. If detected, it will start decoding in the
> vbidecoder class. An additional OSD overlay osdtypeteletext is used for
> teletext and subtitles. Whole process is controlled from tv_play routines.
> Pages are updated after receiving new content, so even subtitling pages (e.g.
> 888) do work!
> 
> What it does not do yet (TODO ;-)
> - It overrules the 'T' key for teletext/CC for non-encoder cards
> (bttv/saa7134) . The original vbi code (part of nuppelvideoplayer/recorder)
> is still in, but I rather see this becoming part of this new vbidecoder
> class. Like to see 'C' for CC/subtitles and 'T' for teletext. Problem: 'C'
> function already in use...
> As some people have a mixed PVR/bttv setup, we should detect which card is
> operational and select the correct vbi decoder.
> - CC is not working yet, as we do not have this here in Europe. Please test
> the results in ccbuffer and in your stderr terminal and please report your
> findings.
> - Teletext is text-only. No mosaic or other fancy stuff like blanking, FLOF,
> blicking, reveal functions yet. Uses current CC_font in OSD. Should be
> teletext font in future. for the OSD overlay, we suffer from the color
> mapping of YUV420 here. Use a font with sufficient width (eg bold fonts) to
> be able to read the blue or red text.
> - other embedded data like WSS/PIL/CNI/VPS/PDC captured but not used.
> Framework in place, detection and corresponding actions (e.g. signals and
> slots) to be defined.
> - TT OSD overlay is now transparent. Future work is to have black,
> transparent, or even left-TV/right-TT (for 16:9 screens) or TT-PIP
> implemented (for big screens)
> 
> Give it a try and report your findings. Improvements are very welcome.
> 
> Martin
> 
> 
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