Niklas Haas authored Nov 01, 2017 and Thomas Guillem committed Nov 03, 2017

Generated the matrices using the following small program:

    #include <stdio.h>
    #include <libplacebo/colorspace.h>

    void main()
    {
        struct pl_color_repr repr = {
            .sys    = PL_COLOR_SYSTEM_BT_2020_NC,
            .levels = PL_COLOR_LEVELS_TV,
        };

        struct pl_transform3x3 tf = pl_color_repr_decode(&repr, NULL);
        for (int i = 0; i < 3; i++) {
            printf("% .15f, % .15f, % .15f, % .15f ,\n",
                  tf.mat.m[i][0], tf.mat.m[i][1], tf.mat.m[i][2], tf.c[i]);
        }
    }

I've also verified that the BT.709 and BT.601 matrices are identical
within an error margin of several orders of magnitude. (Probably due to
floating point inaccuracy)

P.s. VLC doesn't seem to distinguish between BT.2020-NC and BT.2020-CL,
which I believe is a bug. But anyway, we can only easily handle
BT.2020-NC anyway, so hard-code it as that. (BT.2020-CL support would
require some more libplacebo integration)

Signed-off-by: Thomas Guillem <thomas@gllm.fr>