[linux-dvb] How to access /dev/videoK from /dev/dvb/adapterN?

Kenneth Aafløy kaa at aafloy.net
Fri Jun 16 22:27:01 CEST 2006


Ralph Metzler skrev:
> Klaus Schmidinger writes:
>  > An application that uses the LinuxDVB driver can access the
>  > DVB devices via /dev/dvb/adapterN/* (N = 0, 1, ...). However,
>  > when it wants to, for instance, capture the current image on
>  > a device (like VDR with its GRAB command), it needs to access
>  > /dev/videoK, where 'K' is a number that is not directly related
>  > to the 'N' mentioned above for the DVB device.
>  > 
>  > So VDR has to do some guessing on which /dev/videoK device might
>  > belong to the /dev/dvb/adapterN device. This is getting particularly
>  > problematic if there are also other /dev/video devices that have
>  > nothing to do with any DVB devices.
>  > 
>  > Is there a defined way in which an application can query a DVB
>  > device for its related /dev/video device?
> 
> Currently not.
> Since upcoming cards with decoder and V4L interface for those will
> need it too, should we add a call for this? In the DVB video device?
> We might also need something like this for audio.

Sounds like a good enhancement, maybe even make this a common V4L/DVB/?? 
ioctl, that applications can query for relations between devices?

Kenneth



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