Create CVPixelBuffer from a CGImage in Xamarin C#

CVPixelBufferHelper.cs

CVPixelBuffer GetBuffer(CGImage image)
{
	const int _bitsPerPixel = 8;
	nint width = (nint)image.Width;
	nint height = (nint)image.Height;
	nint bytesPerRow = (nint)image.BytesPerRow;
	var	bufferData = new byte[height * bytesPerRow];
	var colorspace = image.ColorSpace;
	var bmi = image.BitmapInfo;

	var buf = CVPixelBuffer.Create(width, height, CVPixelFormatType.CV32BGRA, bufferData, bytesPerRow, null, out CVReturn status);
	{
		if (status != CVReturn.Success)
			throw new Exception("Failed to allocate pixel buffer");

		buf.Lock(CVPixelBufferLock.None);

		using (mBitmapContext = new CGBitmapContext(buf.GetBaseAddress(0), width, height, _bitsPerPixel, bytesPerRow, colorspace, bmi))
		{
			try
			{
				var rect = new CGRect(0, 0, image.Width, image.Height);
				mBitmapContext.InterpolationQuality = CGInterpolationQuality.High;
				mBitmapContext.ConcatCTM(CGAffineTransform.MakeRotation(0));
				mBitmapContext.DrawImage(rect, image);
				buf.Unlock(CVPixelBufferLock.None);

			}
			catch (Exception ex)
			{
				Console.WriteLine(ex.Message);
			}
		}

		return buf;

	}
}