[linux-dvb] Re: Bug in scan app?

[Johannes Stezenbach <js@convergence.de>]

Jamie Honan wrote:
> 
> I think there's a bug in scan.c. From the CVS version,
> I get multiple audio pids for certain services, e.g.
> 
> 	OPT - ABC PNN:12720:v:S156.0E:30000:0:776,776,776:0:1:833:0:0:0
> 
> I think this is caused by the same table id being used for different
> service id's.
> 
> Truncated trace shows following services: (extra debugging is mine)
> 
> 	parse_section:920: pid 0x00 tid 0x00 table_id_ext 0x0008, 0/0 (version 4)
> 	PAT
> 	service 0x0341
> 	allocate 0x0341
> 	pid 0x0022 priv 0
> 	add_filter:1125: add filter pid 0x0022
> 	start_filter:1071: start filter pid 0x0022 table_id 0x02
> 	service 0x0342
> 	allocate 0x0342
> 	pid 0x0022 priv 0
> 	add_filter:1125: add filter pid 0x0022
> 	start_filter:1071: start filter pid 0x0022 table_id 0x02

Tha PAT is invalid because more than one service point to the same
PMT PID. But the PMT has a field "program_number" which corresponds
to the service_id from the PAT. scan relies on that program_number.

As a workaround, one could remember the service_id in the PMT filter's
struct section_buf, and use that in parse_pmt instead of the
program_number (== table_id_ext) from the PMT.


Johannes


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