[linux-dvb] DSM-CC Synchronized Download Protocol

Rudy Zijlstra rudy at edsons.demon.nl
Wed Mar 14 09:42:29 CET 2007


Hi,

On Tue, 13 Mar 2007, Thomas Lagemann wrote:

> Johannes Stezenbach schrieb:
>> On Tue, Mar 13, 2007, Thomas Lagemann wrote:
>> 
>>> I'm looking for information in the "DSM-CC Synchronized Download 
>>> Protocol". In an amandment to MPEG-2 "Systems" this is stated to be a 
>>> synchronous method of delivering data in an MPEG-2 stream.  It's said that 
>>> the data is inserted into DSM-CC Download sections which carry a PTS entry 
>>> for synchronization. But i can't find any information about this in 
>>> 13818-6 which secifies DSM-CC.
>>> Maybe someone can explain me this, or hand me an article for further 
>>> reading.
>>> 
>> 
>> I have no idea what it is but ISO lists this:
>> 
>> ISO/IEC 13818-6:1998/Amd 2:2000
>> 
>> http://www.iso.org/iso/en/CatalogueDetailPage.CatalogueDetail?CSNUMBER=33123&ICS1=35&ICS2=40&ICS3=
>> 
> thanks, that explains at least why there's nothing to find in the original 
> specification. But it seems the paper is not available for free. Before i 
> spend money on this (though its not much) id like to know a bit more about 
> it. Also most of the iso standard papers do not include much info about the 
> practical use.
> So maybe anyone who worked with this can explain me some details:
> - does this method require flow-control (kommunication with the server)?
> - what are the requirements for a receiver to manage dsm-cc download sections 
> ?
> - is there support of this method in DVB? (since i only know of the DSM-CC 
> caraousel being used in DVB)
>

It is used in DVB. There is an at least partial Open source implementation 
in Mythtv

Cheers,

Rudy

>
> regards,
> Thomas
>



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