[linux-dvb] Re: Suggestion for channel tuning

[Jan Panteltje <root@panteltje.demon.nl>]

On Sat, 21 Apr 2001, Dave Chapman wrote:

> After reading ISO-13818-1 (the MPEG-2 standards document that defines the 
> structure of a Transport Stream), I've been experimenting with tuning 
> channels without knowing their video and audio pids - just the service_id / 
> program_number.
> 
> I've written a small program that tunes a channel based on only the 
> frequency, polarity, symbol rate and program number.  This works well, and 
> the scanning of the PAT (to get the PID of the PMT), PMT (to get the ES PIDs) 
> and SDT (to get the name of the channel and broadcaster - possibly 
> unneccesary) adds between 0.1 and 0.5 seconds to the tuning time.  This 
> depends on luck and how many channels are on the transponder.
> 
> Has anyone else had any experience of tuning like this?  It seems to me that 
> ISO-13818 is implying that the only parameters needed to tune a channel is 
> the service_id.  This makes sense to me - at least on Astra 28, the channels 
> change PIDs quite frequently.
> 
> Regards,
> 
> Dave.
> 
> 
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I am interested in any code that works.
Regards
Jan



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