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List:       linux-video
Subject:    Re: [video4linux] multiple opens/VfW
From:       Bill Dirks <dirks () rendition ! com>
Date:       1998-07-28 19:43:26
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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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