Re: Possible to use Core Video with QTCapture?

Subject: Re: Possible to use Core Video with QTCapture?

From: "E. Wing" <email@hidden>

Date: Fri, 30 Jan 2009 19:37:54 -0800

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On Fri, Jan 30, 2009 at 6:50 PM, vade <email@hidden> wrote:

I puzzled over that a bit too, but you can get the a connection by asking for the current connections array from your QTCaptureVideoPreviewOutput object since it is a subclass of a QTCaptureOutput, and getting the the last or first object in the connections array, because typically you will only have one connection. This is at least how it was in one of the QT Capture examples:

mCapturePreviewOutput is a QTCaptureVideoPreviewOutput :)

[mCapturePreviewOutput setVisualContext:textureContext forConnection:[[mCapturePreviewOutput connections] lastObject]];

Thanks. That was a big help.

Slightly more minor question, is there a way to find out what resolution the capture device uses? I can figure out the size in the Core Video callback with CVOpenGLTextureGetCleanTexCoords() which you told me about earlier today. But my test code still (badly) likes to preallocate things at startup rather than do it in the callback. So I was wondering if there was a way to get this value before I start.

I tried QTCaptureDevice deviceAttributes, but I'm getting an empty dictionary for the Logitech camera I currently have in front of me. (I don't have an iSight to test with at the moment.)

Thanks,
Eric

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References:
	>Possible to use Core Video with QTCapture? (From: "E. Wing" <email@hidden>)
	>Re: Possible to use Core Video with QTCapture? (From: vade <email@hidden>)
	>Re: Possible to use Core Video with QTCapture? (From: "E. Wing" <email@hidden>)
	>Re: Possible to use Core Video with QTCapture? (From: vade <email@hidden>)