FYI, the source code for a Bt848-based card is available in the
Win98 DDK. Although this is new Windows (WDM) based, you
can use it as a reference.
However, this code is *very* exotic (C++ templates, colorful classes,
etc.). Good luck.
-- Peter
-----Original Message-----
From: Justin Schoeman <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Date: Thursday, July 13, 2000 9:05 AM
Subject: Re: Again: my bttv drops first fields; more questions.
>Robert Suetterlin wrote:
>>
>> Hello everyone,
>>
>> I already applied with this problem and already got an answer
which (of course :) did not satisfy me fully.
>>
>> Again: My problem is, that my bttv (card? driver? whatever?) drops first
fields. So when I grab a field the dirver? knows it must grab two fields and
grabs the second fields of consecutive frames. It could also be that it
grabs field two of frame x and field one of frame x+1.
>> I have two problems: 1) How can I diagnose/detect this error
easily (i.e. should I measure the time it takes to grab fields, is there an
ioctl, or do I have to change to vl4-two, ...)?
>> 2) Is this a general or known problem with other people and how
can I fix it?
>>
>> Point two was already answered in the following way: Try all bttv-cards
and see if the error vanishes with one of them. Point one was hinted to: try
v4l-two, this allows for example to grab single fields.
>>
>> These answers did not satisfy me fully as I already stated above, but
still there were some hints. And I have a few more refined questions.
>> Trying every one of the 40-something drivercards is not such a good idea
in my opinion, what is the big difference anyway? Number of composite or
svhs connectors, does the card have Teletext or not, or an radio reciever...
>> So question one: What is the difference in card-type, can I
define a new card-type (and how), should I look this up in the source code
myself?
>> And two: Is it advisable to change to v4l-two (as it allows
better diagnostics, or why?), how to do it, or where to get information on
this?
>>
>> Thank You,
>>
>> Robert S. {:).
>
>Don't go to v4l2 - it is even worse there. At one stage I tried
>desparately to track down the source of this problem, but without
>success. Windows doesn't seem to have this problem though, so there
>MUST be a solution... I just wish I could find it :-<
>
>-justin
>
>
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