On 10 Apr 2002, Gerd Knorr wrote:
> Alan McIvor wrote:
> >  Hi,
> >  
> >  At the hardware level, the bt878 has a register which says whether or
> >  not there is a video signal on the input (bit BT848_DSTATUS_PRES in
> >  the dstat register), but I don't think this is available in user
> >  space.
> 
> video_tuner->signal = (BT848_DSTATUS & BT848_DSTATUS_HLOC) ? 0xFFFF : 0;

Not very useful.  You can't query the tuner unless you have it selected as the
input.  So if your card doesn't have a tuner, or you are using the composite
or s-video input, this won't work.

Most tuners have AFC bits that tell you if your frequency is too high or too
low, which you can't access via the driver either.



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