How to turn a CVPixelBuffer into a UIImage?

Question

I\'m having some problems getting a UIIMage from a CVPixelBuffer. This is what I am trying:

CVPixelBufferRef pixelBuffer = CMSampleBufferGetImageBuffer(imag         


        

Answer 1

The previous methods led me to have CG Raster Data leak. This method of conversion did not leak for me:

@autoreleasepool {

    CGImageRef cgImage = NULL;
    OSStatus res = CreateCGImageFromCVPixelBuffer(pixelBuffer,&cgImage);
    if (res == noErr){
        UIImage *image= [UIImage imageWithCGImage:cgImage scale:1.0 orientation:UIImageOrientationUp];

    }
    CGImageRelease(cgImage);
}


    static OSStatus CreateCGImageFromCVPixelBuffer(CVPixelBufferRef pixelBuffer, CGImageRef *imageOut)
    {
        OSStatus err = noErr;
        OSType sourcePixelFormat;
        size_t width, height, sourceRowBytes;
        void *sourceBaseAddr = NULL;
        CGBitmapInfo bitmapInfo;
        CGColorSpaceRef colorspace = NULL;
        CGDataProviderRef provider = NULL;
        CGImageRef image = NULL;

        sourcePixelFormat = CVPixelBufferGetPixelFormatType( pixelBuffer );
        if ( kCVPixelFormatType_32ARGB == sourcePixelFormat )
            bitmapInfo = kCGBitmapByteOrder32Big | kCGImageAlphaNoneSkipFirst;
        else if ( kCVPixelFormatType_32BGRA == sourcePixelFormat )
            bitmapInfo = kCGBitmapByteOrder32Little | kCGImageAlphaNoneSkipFirst;
        else
            return -95014; // only uncompressed pixel formats

        sourceRowBytes = CVPixelBufferGetBytesPerRow( pixelBuffer );
        width = CVPixelBufferGetWidth( pixelBuffer );
        height = CVPixelBufferGetHeight( pixelBuffer );

        CVPixelBufferLockBaseAddress( pixelBuffer, 0 );
        sourceBaseAddr = CVPixelBufferGetBaseAddress( pixelBuffer );

        colorspace = CGColorSpaceCreateDeviceRGB();

        CVPixelBufferRetain( pixelBuffer );
        provider = CGDataProviderCreateWithData( (void *)pixelBuffer, sourceBaseAddr, sourceRowBytes * height, ReleaseCVPixelBuffer);
        image = CGImageCreate(width, height, 8, 32, sourceRowBytes, colorspace, bitmapInfo, provider, NULL, true, kCGRenderingIntentDefault);

        if ( err && image ) {
            CGImageRelease( image );
            image = NULL;
        }
        if ( provider ) CGDataProviderRelease( provider );
        if ( colorspace ) CGColorSpaceRelease( colorspace );
        *imageOut = image;
        return err;
    }

    static void ReleaseCVPixelBuffer(void *pixel, const void *data, size_t size)
    {
        CVPixelBufferRef pixelBuffer = (CVPixelBufferRef)pixel;
        CVPixelBufferUnlockBaseAddress( pixelBuffer, 0 );
        CVPixelBufferRelease( pixelBuffer );
    }