[linux-dvb] Re: Help for PMT needed

["Kamil Burzynski" <K.Burzynski@adbglobal.com>]

----- Original Message ----- 
From: "Nico" <sabbi@cs.unibo.it>
To: <linux-dvb@linuxtv.org>
Sent: Thursday, August 07, 2003 11:51 AM
Subject: [linux-dvb] Help for PMT needed


> if the TS packet has the PUSI field set then I consider that packet as the
> start of a PMT section;
> now, after having read and verified the values of pointer (skip bytes),
> SSI  and version_number,
> I calculate the value of section_length and if it's > 183-SKIP then
> I try to read from the TS the next packet of PMT_PID where PUSI is not set
> (to complete the section of the PMT with the same version number).
> 
> The problem is that although the value of section_length is large,
> there's NO packet with PUSI not set, so the sections are always
> incomplete.
> 
> The questions are:
> am I proceeding the right way to read the PMT? and if so, is my case
> covered in the standard ? How do I recognize where a section begins and
> where it ends?

I'm not familiar with linuxdvb driver itself, i'm just doing similar things
(i.e. PSI/SI analyzing/generation) in my software.

However, it seems for me that:

a) Some packets are missing in your input data (e.g. due to wrong filters only
PUSI packets are retrieved or something similar)

or

b) You are parsing PMT in a wrong way - for example PMT can be small and fit
into single 188 packet.

Can you post hexdump of single PUSI packet which you are trying to parse?

Best regards from
Kamil Burzynski
Senior Design Engineer
Advanced Digital Broadcast Poland, LTD.
  - -
"Yes, I'm criminal. My crime is that of curiosity."


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