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Re: Quicktime Dev Newbie

Greg,

Sounds like you need to look at the Sequence Grabber API's. They'll get the video from the live camera feed. The Sequence Grabber api's allow you to capture the image data to an offscreen gworld first, rather than drawing directly to the screen. You can install a callback function that will fire whenever there's a new frame of video ready in the gworld. Then you can composite whatever graphic you need to on top of the video data, and move it into an onscreen window.

There's a lot of good sample code that shows you how to do this at http://developer.apple.com/samplecode/Sample_Code/QuickTime/ Capturing.htm. In particular, have a look at SGDataProc sample and Cocoa-SGDataProc.

Brad Ford
QuickTime Engineering


On Wednesday, September 25, 2002, at 03:25 AM, Greg Hulands wrote:

Hi,
I am new to quicktime development and have looked over some of the API docs, but would like some clear direction on what I should look at. I have a part of my application that will need to get a video feed from a firewire DV camera and then overlay some moving sprites. It is so put into a car that will have the camera looking forward and have a speedo and tacho overlay the video, it is not really necessary to save any of this to a quicktime file (but would probably be good to design it to do this).

What particular parts of quicktime should i concentrate on reading to get this type of functionality?

Any help or hints are greatly appreciated.

Regards,
Greg
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References: 
 >Quicktime Dev Newbie (From: Greg Hulands <email@hidden>)



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