[vdr] multiple non-independent frontends

Klaus Schmidinger Klaus.Schmidinger at tvdr.de
Fri Jan 8 16:00:36 CET 2010

On 06.01.2010 19:30, Anssi Hannula wrote:
> Klaus Schmidinger wrote:
>> On 06.01.2010 14:22, Tomasz Bubel wrote:
>>> [...]
>>>> - Added support for DVB cards with multiple fontends. Note that this only
>>>>  works for DVB cards where each frontend can be used independently of all
>>>>  the others on the same adapter.
>>> [...]
>>> Any chance of using using DVB-T frontend on HVR-4000? This card have 2
>>> separate frontends. And as quoted on
>>> http://www.linuxtv.org/wiki/index.php/Hauppauge_WinTV-HVR-4000:
>>> "Multiple frontends are supported: DVB-S/S2 and DVB-T appear as
>>> /dev/dvb/adapterN/frontend0 and /dev/dvb/adapterN/frontend1
>>> respectively.
>>> Due to a hardware limitation, the two frontends cannot be used
>>> simultaneously. However they can be used sequentially within the same
>>> application. The driver handles the mutual exclusion appropriately."
>> Well, that's still a problem.
>> Is there a defined way (via the LinuxDVB driver API) through which VDR
>> can find out whether the frontends can be used independently?
> Shouldn't all frontends that are independent show up as completely different 
> adapters in /dev/dvb/, so that VDR can assume only one frontend per adapter is 
> usable simultaneously?

I would love it if I could assume that with an adapter with several
frontends, only *one* of these frontends could be used at any given time,
and that, if a DVB hardware provides several frontends that can be used
simultaneously, these would appear as separate adapters with one frontend
each. That would be a simple, straightforward setup. But apparently
things aren't meant to be simple... :-(


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