Hi, thanks for your reply. I've got one more dumb question though. I'm
not able to figure out how to do the declaration of the release
callback.
Regards,
Adrian
On Jul 6, 2009, at 12:55 AM, vade wrote:
you will most likely need to use an NSBitmapImageRep or a
CVPixelbuffer to provide raw pixel values, and then output an image
provider using your QCContexts incredibly long:
- (id) outputImageProviderFromBufferWithPixelFormat:
(NSString*)format pixelsWide:(NSUInteger)width pixelsHigh:
(NSUInteger)height baseAddress:(const void*)baseAddress bytesPerRow:
(NSUInteger)rowBytes releaseCallback:
(QCPlugInBufferReleaseCallback)callback releaseContext:
(void*)context colorSpace:(CGColorSpaceRef)colorSpace
shouldColorMatch:(BOOL)colorMatch
method.
The release context is not a GL context or anything, just a void *
you can pass in to your release function to point it at whatever you
want to make your life easier.
Here is working code from a CVPixelBuffer to an output port, where
aBuffer is just an unsigned char* buffer. Im pretty sure you can do
that same with NSBitmapImageRep
CVReturn error = CVPixelBufferCreateWithBytes(NULL, width, height,
k32ARGBPixelFormat, aBuffer, rowBytes, NULL, NULL, NULL,
&cvImageBuffer);
if(CVPixelBufferLockBaseAddress(cvImageBuffer,0) ==
kCVReturnSuccess)
{
provider = [context
outputImageProviderFromBufferWithPixelFormat:QCPlugInPixelFormatARGB8
pixelsWide:width pixelsHigh:height
baseAddress:CVPixelBufferGetBaseAddress(cvImageBuffer)
bytesPerRow:CVPixelBufferGetBytesPerRow(cvImageBuffer)
releaseCallback:_BufferReleaseCallback releaseContext:NULL
colorSpace:CGColorSpaceCreateWithName(kCGColorSpaceGenericRGBLinear)
shouldColorMatch:YES];
CVPixelBufferUnlockBaseAddress(cvImageBuffer,0);
}
Hope this helps!
On Jul 5, 2009, at 12:08 PM, Adrian Lo wrote:
Dear all,
I'm having some trouble trying to proceed with this custom patch
that I've got. The patch basically accepts some numeric input
parameters which determines what data to grab from a URL, and
renders the results into an image to be send out via the output
port of the patch.
I've got the image generated nicely as a NSImage, and I'm not stuck
on how to send the NSImage to the output port. Would really
appreciate some pointers on this, as I'm not even sure if I should
be using NSImage for such operations or not.
thanks in advance,
Adrian
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