pvrxxx, linux code and modules

John-Mark Gurney gurney_j at resnet.uoregon.edu
Fri Apr 27 06:10:18 UTC 2007

Greg 'groggy' Lehey wrote this message on Fri, Apr 27, 2007 at 15:17 +0930:
> > Is it safe to assume that with these two codes, the tuner will always
> > be identifiable? (i.e. lets say a Leadtek card uses the same tuner,
> > will I be able to take one byte from the Leadtek eeprom for it's
> > eeprom code (El), and one byte for it's tuner code (Tl), and be able
> > to determine the tuner, or might I need multiple bytes for El and/or
> > Tl? Will they always be integers? Could strings be expected?
> My problem is that I don't know much about the tuners myself.  That's
> a thing I'm planning to do when I have time.  Judging by the lack of
> response from others, I'd guess that they don't have a definitive
> answer either.  But from what I've heard, I suspect it's a good idea
> not to rely on anything.

Usually tuners are broken into two parts... One is the RF side of
things that takes the antenna in, and tunes in the channel, and
converts it down to base band signal, 0-6Mhz instead of 54-60Mhz...
Then there is the demodulator that takes the base band signal in
and converts it to the digital signal that the card then buffers
and transfers to the PCI bus...  Usually the RF and demodulator are
at different i2c address...

Does this give you what you want?

  John-Mark Gurney				Voice: +1 415 225 5579

     "All that I will do, has been done, All that I have, has not."

More information about the freebsd-multimedia mailing list