[vdr] cSdtFIlter and LinkChannels

Klaus Schmidinger Klaus.Schmidinger at tvdr.de
Fri Nov 12 16:24:47 CET 2010


On 29.09.2010 15:22, Luca Olivetti wrote:
> Hello,
> 
> I'm trying to understand cSdtFilter in order to write a channel scanner.
> 
> I see that when it finds a SI::NVODReferenceDescriptorTag it will add it
> to the previously found channel with channel->SetLinkChannels, but it
> only does if it is in the current section (channel is a local variable)
> while the sdt could span several sections.
> 
> From the specifications here
> 
> http://neuron2.net/library/mpeg2/iso13818-1.pdf
> 
> and here
> 
> http://www.dvb.org/technology/standards/a005r5.tm1324r13.tr101211.v1.10.1.pdf
> 
> 
> I don't understand if this mechanism is correct, shouldn't the
> "time_shifted_services" link to the "NVOD_reference"?
> Besides, I don't see that the relation between a channels and its
> linkchannels is preserved in channels.conf (though I don't really care).

You're right, the link channel information is not stored in channels.conf.

> I also see that cSdtFilter starts processing with the first section, and
> that shouldn't really be necessary as long as one processes all sections.

Personally I'm not interested in that whole NVOD stuff, therefore
I'm afraid I can't be of much help there. If you can suggest any improvements
in that area, please post a patch.

Klaus



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