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

Ralph Metzler rjkm at metzlerbros.de
Fri Jun 16 21:39:22 CEST 2006


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.


Ralph



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