[vlc-devel] Fwd: commit: Do not ignore teletext initial page (close #1997). (Laurent Aimar )

Derk-Jan Hartman hartman at videolan.org
Tue Sep 9 17:34:44 CEST 2008

Hi Michael,

We are having a discussion with about the sample below.
Apparently zvbi falls back to it's default G0

Is there an easy way to read out all the place where G0 can be  
specified, so that i can verify if it is the source that is simply  
Level1, or that i is zvbi that is missing one of the many places where  
G0 can be specified ?

If i read the spec correctly, G0 can be specified in any of the  
following packets:

X/28/0 format1

does zvbi support all this ?


Begin forwarded message:

> From: "Marian Ďurkovič" <md at bts.sk>
> Date: 8 september 2008 19:54:09 GMT+02:00
> To: Mailing list for VLC media player developers <vlc-devel at videolan.org 
> >
> Subject: Re: [vlc-devel] commit: Do not ignore teletext initial page  
> (close #1997). (Laurent Aimar )
> Reply-To: Mailing list for VLC media player developers <vlc-devel at videolan.org 
> >
> On Mon, 8 Sep 2008 19:01:56 +0200, Derk-Jan Hartman wrote
>>> The characters displayed are the western ones. With the simple telx
>>> decoder,
>>> this works fine. Is this some bug in zvbi or VLC does not pass info
>>> about
>>> teletext language to zvbi properly?
>> This information should be passed in the teletext stream itself. The
>> language as described in the descriptor should not affect it as far  
>> as
>> I know.
>> And it seems to be requesting utf-8 from zvbi...
>> Perhaps we don't set that in the track information, but I think that
>> should be automatic.
>> Do you have a sample for me to test with ?
> Sure - please fetch http://md.bts.sk/telx/ct1.ts
> Select teletext page 898 - the test picture.
> It should look like this:
> http://www.ceskatelevize.cz/teletext/index.php?page=898&ver=&channel=
> The capital letters are (mostly) OK, only "Ť" is missing.
> However the small special characters at rows 08 and 09 are completely
> wrong.
> Those characters are transmitted differently - the capitals which  
> require
> advanced teletext capabilities work almost fine.
> But the small letters are those basic national subsets mentioned in
> modules/codec/telx.c:
> static const uint16_t ppi_national_subsets[][20] =
> {
>  { 0x0023, 0x016f, 0x010d, 0x0165, 0x017e, 0x00fd, 0x00ed, 0x0159,
>    0x00e9, 0x00e1, 0x0115, 0x00fa, 0x0161 }, /* czech,slovak  ,011 */
>   With kind regards,
>        M.
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