avutil/pixdesc: Make get_color_type() aware of CIE XYZ formats

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 1ec7a703)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavutil/pixdesc.c

@@ -2247,6 +2247,7 @@ enum AVPixelFormat av_pix_fmt_swap_endianness(enum AVPixelFormat pix_fmt)
 #define FF_COLOR_GRAY     1 /**< gray color space */
 #define FF_COLOR_YUV      2 /**< YUV color space. 16 <= Y <= 235, 16 <= U, V <= 240 */
 #define FF_COLOR_YUV_JPEG 3 /**< YUV color space. 0 <= Y <= 255, 0 <= U, V <= 255 */
+#define FF_COLOR_XYZ      4
 
 #define pixdesc_has_alpha(pixdesc) \
     ((pixdesc)->nb_components == 2 || (pixdesc)->nb_components == 4 || (pixdesc)->flags & AV_PIX_FMT_FLAG_PAL)
@@ -2262,6 +2263,9 @@ static int get_color_type(const AVPixFmtDescriptor *desc) {
     if(desc->name && !strncmp(desc->name, "yuvj", 4))
         return FF_COLOR_YUV_JPEG;
 
+    if(desc->name && !strncmp(desc->name, "xyz", 3))
+        return FF_COLOR_XYZ;
+
     if(desc->flags & AV_PIX_FMT_FLAG_RGB)
         return  FF_COLOR_RGB;