Mailing List Archive: cx18: Testers needed: VBI for non-NTSC-M input signals

cx18: Testers needed: VBI for non-NTSC-M input signals

May 16, 2009, 7:06 PM

Post #1 of 3 (2358 views)

Hi,

Thanks to a loaner PVR-350 from Hans, I've been able to implement VBI
support in the cx18 driver for non-NTSC video standards.

If you've got a 625 line PAL, SECAM, etc, video source and can test VBI
functions on a CX23418 based card, I'd like to hear how it works. The
patches for testing are here:

http://linuxtv.org/hg/~awalls/cx18-av-core
http://linuxtv.org/hg/~awalls/cx18-av-core/archive/tip.tar.bz2

I've only been able to test with PAL with VPS in field 1 line 16 and WSS
in field 1 line 23. I wasn't able to figure out how to get Teletext B
out of the PVR-350, so I'd certainly like to hear if Teletext is
working.

Note: to implement Raw VBI for 625 line/50 Hz systems to extract line 23
(WSS), I had to blank one extra line in each field. This means that
625/50 systems will be missing 1 line from the top of each field (e.g.
line 24 won't show). I thought that was better than having the fields
move up or down around if the user turned VBI on or off.

Regards,
Andy

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cx18: Testers needed: VBI for non-NTSC-M input signals [ In reply to ]

awalls at radix

May 16, 2009, 7:06 PM

Post #2 of 3 (2233 views)

Permalink

Re: cx18: Testers needed: VBI for non-NTSC-M input signals [ In reply to ]

hverkuil at xs4all

May 17, 2009, 1:35 AM

Post #3 of 3 (2219 views)

Permalink

On Sunday 17 May 2009 04:06:04 Andy Walls wrote:
> Hi,
>
> Thanks to a loaner PVR-350 from Hans, I've been able to implement VBI
> support in the cx18 driver for non-NTSC video standards.
>
> If you've got a 625 line PAL, SECAM, etc, video source and can test VBI
> functions on a CX23418 based card, I'd like to hear how it works. The
> patches for testing are here:
>
> http://linuxtv.org/hg/~awalls/cx18-av-core
> http://linuxtv.org/hg/~awalls/cx18-av-core/archive/tip.tar.bz2
>
> I've only been able to test with PAL with VPS in field 1 line 16 and WSS
> in field 1 line 23. I wasn't able to figure out how to get Teletext B
> out of the PVR-350, so I'd certainly like to hear if Teletext is
> working.

You can't get teletext out of the PVR-350. Only WSS and VPS. It's a hardware
limitation.

I don't have access to my HVR1600 this week, I'll see if I can test it next
Sunday.

Regards,

Hans

> Note: to implement Raw VBI for 625 line/50 Hz systems to extract line 23
> (WSS), I had to blank one extra line in each field. This means that
> 625/50 systems will be missing 1 line from the top of each field (e.g.
> line 24 won't show). I thought that was better than having the fields
> move up or down around if the user turned VBI on or off.
>
> Regards,
> Andy

--
Hans Verkuil - video4linux developer - sponsored by TANDBERG

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