[linux-dvb] Re: SI_PARSER.C ISSUE

[Sheetal_Pandey <Sheetal_Pandey@Satyam.com>]

Hi Rolf,

I want to bring under your notice some of the points that I had found out
during the development.I am referring the document
DVB-SI_info-en_300468v010401p for extracting various tables from TS
clips.This document can be downloaded from etsi.org which is an official
site for DVB documents.

Pl. see that my findings are based on above document which talks about the
syntax of MPEG2 TS.
I found that the code si_parser.c doesnot take care of the ADAPTATION FIELD
CONTROL bits.To explain a little further, in the header there are two
adptation field control bits which has following options:

1.01-no adptation field,payload only
2.10-adaptation field only,no payload
3.11-adaptation field followed by payload
4.00-reserved for future use.

Since the code need to be general it should take care of all the four
options.The presence of an adaptation field is indicated by the adaptation
field control bits in a transport stream packet.If present,the adaptation
field directly follows the 4 Byte packet header,before any user payload
data.This is the case with the clips I have.

I had modified the si_parser.c to consider these bits.I would highly
appreciate if you can comment on this.

Regards,
Sheetal Pandey


-----Original Message-----
From: Rolf Hakenes [mailto:hakenes@hippomi.de]
Sent: Wednesday, February 05, 2003 12:31 AM
To: linux-dvb@linuxtv.org
Cc: Klaus Schmidinger
Subject: [linux-dvb] Re: SI_PARSER.C ISSUE


Hi,

there is a new version of 'libdtv' available (this package contains the
si_parser.c and is used in VDR to parse SI data).

Maybe Klaus can test it and integrate it into his nex VDR release. For
anyone interested the code is downloadable at:

 http://hesdvb.sf.net/libdtv-0.0.5.tar.gz


I didn't release that code until today, because I hadn't seen anyone
using it...;-)

In detail the changes are:

  from Oleg Assovski:

   + Parsing of NIT/BAT including SatDelSys descriptor, (not including  
other DelSys descriptors)
   + Parsing of CA descriptor for reliable detection of CA services
   + Parsing of TOT with automated bias calculation. Implies that this
computer time is good and provider time is not.
   + Slightly changed behaviour of getDescriptorText - currently no code
page detection (commented out, will be good for all Europe).
   + DumpSection function for debug purposes. 
  
  from me:

   + CAT parsing
   + better CA descriptor parsing
   + some more descriptors, which are used for CAT

Have fun...

Rolf Hakenes


Am Die, 2003-02-04 um 10.34 schrieb raz nitzan:
> HI,
> There is no specific code to parse NIT nor the NIT descriptors.
> I have similair problem with the CAT.
> Can you please send a list of sites with TS clips
> Thanks,
>   Raz
> ----- Original Message -----
> From: "Sheetal_Pandey" <Sheetal_Pandey@Satyam.com>
> To: "raz nitzan" <raz.nitzan@harmonicinc.com>
> Cc: <linux-dvb@linuxtv.org>
> Sent: Tuesday, February 04, 2003 11:10 AM
> Subject: [linux-dvb] Re: SI_PARSER.C ISSUE
> 
> 
> > Hi Raz,
> >
> > Thanks for the reply.
> >
> > How are you extracting NIT table information using this code?
> >
> > I have TS clips in CDs and they are huge in size. I dont know how to
send
> > them to you.You may download them from some sites.
> >
> > Regards,
> > Sheetal Pandey
> >
> > System Analyst
> > VBU-Times
> > --------------------------------------------------
> > Satyam Computer Services
> > No.14,Langford Avenue
> > Lal Baug Road, Langford Gardens
> > Bangalore, India
> > Ph-2231696 -Ext-5711
> > --------------------------------------------------
> >
> >
> > -----Original Message-----
> > From: raz nitzan [mailto:raz.nitzan@harmonicinc.com]
> > Sent: Tuesday, February 04, 2003 1:40 PM
> > To: Sheetal_Pandey; linux-dvb@linuxtv.org
> > Subject: Re: [linux-dvb] SI_PARSER.C ISSUE
> >
> >
> > Hi,
> > I have tried it and it works.
> > Can you tell me were can I find sample TS clips.
> >   Raz
> > ----- Original Message -----
> > From: "Sheetal_Pandey" <Sheetal_Pandey@Satyam.com>
> > To: <linux-dvb@linuxtv.org>
> > Sent: Tuesday, February 04, 2003 7:28 AM
> > Subject: [linux-dvb] SI_PARSER.C ISSUE
> >
> >
> > > Hi All,
> > >
> > > Has anybody tried extracting various packets information from the
sample
> > > Transport Stream clips using SI_Parser.c?This code is present in
> > > dvb-driver\vdr-1.0.0pre2\vdr-1.0.0pre2\libdtv\libsi\si_parser.c.If yes
> pl.
> > > send a reply so that I can discuss some issues.
> > >
> > >
> > > Regards,
> > > Sheetal Pandey
> > >
> > > System Analyst
> > > VBU-Times
> > > --------------------------------------------------
> > > Satyam Computer Services
> > > No.14,Langford Avenue
> > > Lal Baug Road, Langford Gardens
> > > Bangalore, India
> > > Ph-2231696 -Ext-5711
> > > --------------------------------------------------
> > >
> > >
> > >
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