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List:       linux-video
Subject:    Re: [video4linux] multiple opens/VfW
From:       alexb () jetsuite ! com (Alex Bakaev)
Date:       1998-07-28 20:30:53
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Bill,

my driver didn't permit multiple opens on the same channel. So I was
talking about different channels when I said multiple opens. What does
it mean to open VIDEOIN twice ? I don't even think VfW allows for that.

It's if you have multiple devices, then in makes sense.

Alex

Bill Dirks wrote:
> 
> Alex Bakaev wrote:
> > Bill Dirks wrote:
> > > One thing that we could do under Video for Windows, because there was a
> > > per-open handle, was have multiple capture contexts on the same device,
> >
> > But each 'contex' ( or open handle ) had somewhat different set of
> > possible calls.
> 
> Not true.
> Yes, there are diffent kinds of opens (VIDEOIN, VIDEOEXTERNALIN, etc.),
> and the different kinds had different possible calls, but two opens of
> the same kind have the same calls, but are different contexts, and you
> could make each context unique because each had a unique open handle.
> 
> For example, when you have two or more VIDEOIN handles, each VIDEOIN
> handle has its own format, and when you call DVM_FRAME you get the image
> in the format for that open handle.
> 
> > > so for example you could still receive a video call while the WebCam is
> > > running in the background. Stuff like that.
> 
> > I suggest adding another type of channel ( settings ) which controls all
> > the goodies like brightness, etc.
> > Only one user can have it open at a time. So there is no need for
> > MASTER/LURKER classification.
> >
> > Alex
> 
> Well, MASTER/LURKER is just another way of saying capture-channel /
> settings-channel.
> 
> Bill.
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