[linux-dvb] Re: PID's in FF and Budget cards, summary. Encryptioncase?

[Holger Waechtler <holger@qanu.de>]

Irek Defée wrote:
> Thanks to all the experts for clarifying this. Still one issue remains 
> thoughJ
>
> Sumarizing first the differences between the FF and Budget cards:
>
>  
> Robert Schlabbach explains:
>
>  
> The FF cards with the TI AV711x set-top box decoder chip on them are 
> physically unable to deliver an unfiltered transport stream. There is a 
> "CAM Bypass" bit in the TPP control register of the TI AV711x, which 
> makes it pass all packets to the embedded ARM CPU, but there is no known 
> way to reconstruct the packet headers in this mode. TI was unable or 
> unwilling to provide any help with this. The TI AV711x has a hardware 
> packet filter in it, which only allows you to specify up to 32 PIDs you 
> want to receive.
>
>  
> Jean-Claude Repetto explains:
>
>  
> I have heard about a simple hardware modification of the FF cards (a 
> wire to add). Look at the archives of this list. There is an option in 
> the kernel ("AV7110 cards with budget card patch") that seems to be 
> related to this modification,
>
> but I am not sure.
>
>  
> Olaf Titz explains:
>
>  
> Because the budget cards send the TS from the frontend directly to the 
> SAA7146, while the FF cards send it to the AV7110 which can only decode 
> it, not pass it unmodified. There even is a hardware patch which adds 
> the missing link to FF cards 
> (http://www.linuxtv.org/mailinglists/linux-dvb/2003/09-2003/msg00050.html).
>
>  
> Perhaps this FAQ should be put into the docs somewhere, along with a few 
> words what the budget-patch driver is for.
>
>  
> The idea of putting this into the docs is excellent….
>
>  
> Now there is one issue remaining still and it concerns ENCRYPTED PID’s:
>
>  
> When the FF card is equipped with CI, CAM and subscription card, how 
> encrypted/decrypted
>
> TS packets are flowing through it? In particular:
>
>  
> Can the DECRYPTED PID’s  be filtered out and transferred from the card 
> over PCI bus?
If you attach the TS signals of the patch to the CAM TS output pins it 
may be possible.

Holger