avutil/pixfmt: add VYU444 pixel format

This maps to the 444YpCbCr8 pixel format as defined by Apple, which is ordered
Cr Y' Cb.

Signed-off-by: James Almer <jamrial@gmail.com>

libavutil/pixdesc.c

@@ -2119,6 +2119,17 @@ static const AVPixFmtDescriptor av_pix_fmt_descriptors[AV_PIX_FMT_NB] = {
         .name = "cuda",
         .flags = AV_PIX_FMT_FLAG_HWACCEL,
     },
+    [AV_PIX_FMT_VYU444] = {
+        .name = "vyu444",
+        .nb_components = 3,
+        .log2_chroma_w = 0,
+        .log2_chroma_h = 0,
+        .comp = {
+            { 0, 3, 1, 0, 8 },        /* Y */
+            { 0, 3, 2, 0, 8 },        /* U */
+            { 0, 3, 0, 0, 8 },        /* V */
+        },
+    },
     [AV_PIX_FMT_UYVA] = {
         .name = "uyva",
         .nb_components = 4,