[linux-dvb] How to descramble?
domi.dumont at free.fr
Sat Oct 15 09:35:56 CEST 2005
Manu Abraham <abraham.manu at gmail.com> writes:
> The first one that i had seen was with TPS, and this was the only way it
> could be worked. In fact stream level decryption according to TPS wasn't
> probably stream level decryption but only program level decryption. I
> might be wrong here though, but that was the only thing that got it to
You statement related to "program level decryption" is misleading. In
all cases only the elementary streams are encrypted. Sending CA
descriptors at program level is only a mean of saying "this
descriptor is valid for *all* elementary streams of this program"
Here's the section 188.8.131.52 of EN50221 that specifies this behavior:
The CA_descriptor after the current_next_indicator is at the
programme level and is valid for all elementary components of the
programme. The CA_descriptor(s) at elementary_stream level is (are)
valid for the elementary_stream only. If, for one
elementary_stream, CA_descriptor(s) exist at programme level and at
elementary_stream level, only the CA_descriptor(s) at
elementary_stream level are taken into account.
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