CODEWITHSUNDEEP
iosaccelerate-frameworkcvpixelbuffervimage
Deepak Sharma
Deepak Sharma

Reputation: 6581

vImage_Buffer init with pixel buffer

I am using the following code to initialize a vImage_Buffer from a pixel buffer. I have passed the second argument in vImageBuffer_InitWithCVPixelBuffer as NULL (vImage_CGImageFormat) so that there are no internal format conversions from pixel buffer to vImageBuffer. It gives a warning in XCode - "Null passed to a callee that requires a non-null argument", but works. Problem is if I convert it to Swift, it doesn't compiles as it needs a non-nil argument. What is the right way to make a vImage buffer from pixel buffer in a pass through manner? Even the declaration of function says a NULL value in second argument is acceptable, but not sure why the warning then.

  // vImage processing
vImage_Error err;
vImage_Buffer buffer;
buffer.data = (unsigned char *)CVPixelBufferGetBaseAddress( pixelBuffer );
buffer.rowBytes = CVPixelBufferGetBytesPerRow( pixelBuffer );
buffer.width = CVPixelBufferGetWidth( pixelBuffer );
buffer.height = CVPixelBufferGetHeight( pixelBuffer );

vImageCVImageFormatRef vformat = vImageCVImageFormat_CreateWithCVPixelBuffer( pixelBuffer );
/*
vImage_CGImageFormat cgformat = {
    .bitsPerComponent = 8,
    .bitsPerPixel = 32,
    .bitmapInfo = kCGBitmapByteOrderDefault,
    .colorSpace = NULL,    //sRGB
};
*/
vImageBuffer_InitWithCVPixelBuffer(&buffer, NULL, pixelBuffer, vformat, NULL, kvImageNoAllocate);

Upvotes: 2

Views: 2633

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