[mythtv] Supporting more Hardware capture cards

[Sam Logen]

Oops, Sorry.  Try this link Daniel:

http://lists-archives.org/video4linux/18478-cx88-blackbird-multiple-fd-s-and-advise_acquire.html

Steven Toth from the V4L list seemed to know something
about it, and wrote me; his email is below.

Sam

--- Steven Toth <stoth at linuxtv.org> wrote:

> The driver has a single resource (the transport bus)
> that can only be 
> used by either the DVB-T or the MPEG encoder at any
> given time, any 
> attempt to try and use both drives GPIO which breaks
> both analog and/or 
> digital.
> 
> The driver protects against that from happening.
> 
> However, as someone mentioned earlier on this list,
> when I implemented 
> that I made an assumption which effected the 88x
> tree (which I believe 
> another dev has since patched), which meant that the
> frontend device 
> could henceforth be only opened by one app at any
> given time, a 
> subsequent request was return -EBUSY (IIRC).
> 
> This broke myth, and possibly other apps.
> 
> To rectify this, another dev posted a patch on this
> list a few months 
> ago (sorry - the author escapes me) and the problem
> should be completely 
> resolved in the current master branch of v4l-dvb.
> 
> That being said, I see no reason why an application
> needs to open the 
> same device multiple times.
> 
> Regards,
> 
> Steve
> 


--- Daniel Kristjansson <danielk at cuymedia.net> wrote:

> On Sun, 2007-11-25 at 00:06 -0800, Sam Logen wrote:
> > It's beginning to sound like that behavior is a
> check
> > for conexant hybrid cards using the blackbird
> drivers,
> > that switch between dvb and broadcast channels.  I
> > found a patch here:
> > 
> >
>
https://www.redhat.com/mailman/private/video4linux-list/2007-May/msg00386.html
> > 
> > That should disable it, and let the hardware get
> > accessed twice.  I'll test the driver patch with
> an
> > un-patched MythTV install, and see how that goes. 
> 
> 
> Sam, that URL requires a password... Anyway, I find
> this bit
> interesting since the conexant based hybrid cards
> worked well
> in 2006 and early 2007, but then began acting funky
> and requiring
> driver module parameters to work at all. Maybe there
> is a single
> easily revertible patch breaking both MPEG
> recording, and
> analog<->digital switching on hybrid cards?
> 
> -- Daniel
> 
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>
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> 



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