Have you taken a look at the CaptureAndCompressIPBMovie sample code? That code does something very similar to what you appear to be in need of.
On May 6, 2011, at 5:30 PM, Jean-Daniel Dupas wrote: > > > Le 6 mai 2011 à 22:22, eveningnick eveningnick a écrit : > >> Hi >> I have a CVPixelBuffer with some background picture. >> I need to draw on this background some foreground image. I don't need >> to preserve the initial CVPixelBuffer's content - i just need to add a >> small foreground watermark onto that buffer. >> >> CIImage does allow to create an image from CVPixelBuffer and paint >> something on top of it (using Core Image filters), but CIImage is >> "read only" - it takes a source image and generates a brand new image >> in a new buffer. >> I can't afford one more copying, that greatly slows things down, >> because the CVPixelBuffer itself is kind of big. And there are a lot >> of them per second (they are generated as frames from a movie). >> >> Is there any way i could draw without such a copy? Maybe there is any >> other imaging framework that allows me to work with CVPixelBufferRef? >> Or should i just 'CVPixelBufferLock' the buffer, and copy raw bytes >> onto the buffer from my source NSImage (that contains the foreground >> image) directly using a loop? This doesn't seem the right way though. >> Could you please help me, what is better to do here? > > > If your pixel buffer has a format supported by the CGBitmapContext API, you > can use the later to draw into it. > > Create a CGBitmapContext using the memory from you CVPixelBuffer, and draw > using the CGContext API. > > -- Jean-Daniel > > > > > _______________________________________________ > > Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) > > Please do not post admin requests or moderator comments to the list. > Contact the moderators at cocoa-dev-admins(at)lists.apple.com > > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/cocoa-dev/douglas_welton%40earthlink.net > > This email sent to douglas_wel...@earthlink.net _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
