Hi folks,
This is my first rodeo using libraw to read RAW files and so apologies in advance if these questions are very trivial.

I am trying to determine the Bayer layout of the RAW images in some sample images I have. It appears that using the filter field in conjunction with cdesc is the way to go. Please correct me if I am mistaken.
I also tried to call COLOR function to confirm my understanding. But, the results I am getting do not appear to be consistent.

My workflow is below:
LibRaw rp;
rp.open_file(fileName);
rp.unpack();
% Inspect rp.imgdata.idata
rp.raw2image();
int c = rawProcessor.COLOR(0, 0);
c = rawProcessor.COLOR(0, 1);
c = rawProcessor.COLOR(0, 2);
c = rawProcessor.COLOR(0, 3);
c = rawProcessor.COLOR(1, 0);
c = rawProcessor.COLOR(1, 1);
c = rawProcessor.COLOR(1, 2);
c = rawProcessor.COLOR(1, 3);

For a sample DNG file, I got
cdesc = "RGBG" and filters = 3789677025. This translates to a G2 B R G1 pattern. I derived this by examining the 32-bit value 2 bits at a time. The COLOR outputs based on the code above are in the order 1, 0, 1, 0, 2, 3, 2, 3 which dont appear to match the pattern derived from filters and cdesc.

Similarly for a NEF file, I got
cdesc = RGBG" and filters = 3031741620. This translates to B G2 G1 R pattern. The COLOR outputs based on the code above are in the order 0 1 0 1 3 2 3 2 which dont appear to match the pattern derived from filters and cdesc.

Is cdesc and filters the correct way to derive the CFA Pattern?

Appreciate any help.

Dinesh