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ccm vs cmatrix

A quick follow up. So based on your descriptions, cmatrix is the transformation from Camera Space to sRGB.

Is ccm similar to cam_xyz i.e. transformation between Camera Space and XYZ?

I have a DNG file shot from a Google Pixel 3 that has all-zeros for cam_xyz and ccm. The rgb_cam and cmatrix have the same values. The profile is also not available.

For such files, how do I convert from input space/camera space to XYZ?