Re: [GnomeMeeting-list] how to support another capture card? (WAS: experience with the V4L1 compatibility of V4L2)

[Damien Sandras <dsandras seconix com>]

On Thu, Apr 18, 2002 at 01:05:50PM -0700, Guilhem Tardy wrote:
> > > I added grabber->SetFrameSize(width, height) in videograbber.cpp, and got
> > > to the bottom of this:
> > 
> > You shouldn't have added that method, but used SetFrameSizeConverter
> > and add a HINT in video4linux.cxx for your card to force the size.
> > That way, VerifyHardwareFrameSize will ignore the problem and it will work.
> 
> There's no HINT that I can see which matches the problem with Videum
> card/driver: the card is set at 352x240 while PWLib still keeps 352x288
> internally (IMHO it is a bug of VideoInputDevice::VerifyHardwareFrameSize,
> which should update the internal variables to what is returned by the driver).

YOU can add this hint to force the size that you want and VerifyHardwareFrameSieze will not complain!

> 
> > You have to add a HINT in PWLib. That works this way because all Video4Linux 
> > drivers do not respect the API. So you set a HINT, to force the required size
> > for your specific driver, and then it will work.
> 
> I can't force a driver to take 352x288 if it happily falls back on 352x240, can
> I? Now, I elected to modify GnomeMeeting (in videograbber.cpp) like this:
> 

Modifying videograbber.cpp is not the way to do it. You have to modify pwlib.
That is the way it works.


> Open()
> SetVideoDeviceParameters()
> ->   SetFrameSize(320,240)
> SetColourFormatConverter()
> SetFrameSizeConverter(352, 288)
> 
> That was a bad idea, indeed. So I will revert to the original videograbber.cpp,
> and try to add a new size converter (352x240 -> 352x288).
> 
> Guilhem.
> 
> 
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