[linux-dvb] Future of Multiproto

Steven Toth stoth at hauppauge.com
Fri Oct 12 00:03:25 CEST 2007


Georg Acher wrote:
> On Thu, Oct 11, 2007 at 05:11:24PM -0400, Steven Toth wrote:
>  
>   
>> Anyway, sadly, I had to drop support for the HVR4000 via your patches 
>> and I'll have to find a way to reimplement support via another mechanism.
>>     
>
> Almost a year ago I've used a very early stage of your 24116 driver as the
> basis for the S2 tuner of the Reelbox (the current driver can be obtained
> from their SVN). 
>
> Since I was already sceptical about the DVB-API "replication" with
> multiproto, I used a pragmatic hack: The modulation (8PSK and S2-QPSK) and
> the rolloff is encoded in the upper 16 bit of the FEC value (usually 0). The
> new S2 FECs are appended after FEC_AUTO. So the API is absolutely backward
> compatible, in fact we are using kernel 2.6.11 on the reelbox.
>
> The only drawback is that the frontend type cannot be changed (still
> FE_QPSK) and the S2 capability detection must be done by the string "DVB-S2"
> in the tuner name ;-) Not very clean, but we are working in a known
> environment...
>
>   
Thanks for the feedback, useful to know.

I know other people are doing similar things with the 24116  in 
commercial CE devices, rather than use multiproto also. They have 
launched products with success.

Regards,

Steve





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