Kevin Kuphal wrote:
David Rudder wrote:
This is a pretty off-the-wall suggestion. Is there anyway to detect
V-Chip signals? I know within the US, all broadcast and cable shows
have a V-Chip signal, but it's turned off during commercials. This
would be a 100% reliable way of detecting commercials, but I have no
clue whether the signal could be picked up by myth.
I would be ironic to have something good come out of V-Chip, eh?
Upon further investigation, it seems like it would be trivial to
extract the information into Myth using the IVTV VBI support. Right
now Myth will extract the CC information out of field one of line 21
(see line 1634 for avformatdecoder.cpp). The XDS information is
stored in field two of that line. I think using buf[3] and buf[4]
would yield the XDS packet V-chip packet based on the information in
the other link I posted.
Decoding that is easy based on the documentation and then it is just a
matter of passing that into the right structure that the commercial
detector can use. I may have to see about getting my PVR-150 to
decode VBI/CC packets and see if mabe I can get this to work...
In looking further, recent SVN changes have the skeleton for XDS parsing
but nothing is done with the data. My PVR-150 is putting data into
/dev/vbi so I think my backend is set up for capturing. This may be my
Christmas project to see if I can properly decode the XDS V-chip
information at least in debugging output to see what it says.
Kevin
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