[linux-dvb] Re: CI implementation question

[Roberto Deza <rdeza@unav.es>]

Hi,

At 10.23 26-01-2004 +0000, Andrew de Quincey wrote:
>On Monday 26 January 2004 06:40, Irek Defée wrote:

>> But the question is: is it possible to get DECRYTPED Transport Stream
>> out from the ff card if one has CAM+card for encrypted package? Or some
>> other form of decrypted stream (PS, PES?). I would like to stream the
>> decrypted stream to several places at home. Is that possible with ff
>> cards?
>
>Theoretically, what happens is the entire TS stream for the transponder
you're 
>tuned to is fed through the CAM, which then decrypts the bits of it for the 
>program you want to watch. It replaces the appropriate encrypted TS packets 
>with decrypted ones. This is then sent to the SAA7146 chip, and from there
is 
>processed like any other transport stream.

On a ff_card, the Transport Stream that comes from the CAM (with some 
packets decrypted as you say) or from the frontend (if the CAM/CI aren't
plugged), is sent to the AV711x which decode & output the video & audio;
simultaneously the decoded video is sent to the SAA7146, for display on
a VGA or V4L applications. Optionally, some TS packets are sent to the 
SAA7146 (passing its by the DPRAM and DEBI interface), for recording /
streaming / timeshift / etc applications.


Best regards:
--
Roberto Deza Asensio
Universidad de Navarra
Data Procesing Center


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