lavu/pixfmt: Introduce VUYX format

This is the alphaless version of VUYA that I introduced recently. After
further discussion and noting that the Intel vaapi driver explicitly
lists XYUV as a support format for encoding and decoding 8bit 444
content, we decided to switch our usage and avoid the overhead of
having a declared alpha channel around.

Note that I am not removing VUYA, as this turned out to have another
use, which was to replace the need for v408enc/dec when dealing with
the format.

The vaapi switching will happen in the next change

doc/APIchanges

@@ -14,6 +14,9 @@ libavutil:     2021-04-27
 
 API changes, most recent first:
 
+2022-08-03 - xxxxxxxxxx - lavu 57.34.100 - pixfmt.h
+  Add AV_PIX_FMT_VUYX.
+
 2022-08-xx - xxxxxxxxxx - lavf 59 - avformat.h
   Deprecate av_stream_get_end_pts() without replacement.
 

libavutil/pixdesc.c

@@ -2504,6 +2504,17 @@ static const AVPixFmtDescriptor av_pix_fmt_descriptors[AV_PIX_FMT_NB] = {
         },
         .flags = AV_PIX_FMT_FLAG_ALPHA,
     },
+    [AV_PIX_FMT_VUYX] = {
+        .name = "vuyx",
+        .nb_components = 3,
+        .log2_chroma_w = 0,
+        .log2_chroma_h = 0,
+        .comp = {
+            { 0, 4, 2, 0, 8 },        /* Y */
+            { 0, 4, 1, 0, 8 },        /* U */
+            { 0, 4, 0, 0, 8 },        /* V */
+        },
+    },
     [AV_PIX_FMT_RGBAF16BE] = {
         .name = "rgbaf16be",
         .nb_components = 4,

libavutil/pixfmt.h

@@ -372,6 +372,8 @@ enum AVPixelFormat {
     AV_PIX_FMT_RGBAF16BE,   ///< IEEE-754 half precision packed RGBA 16:16:16:16, 64bpp, RGBARGBA..., big-endian
     AV_PIX_FMT_RGBAF16LE,   ///< IEEE-754 half precision packed RGBA 16:16:16:16, 64bpp, RGBARGBA..., little-endian
 
+    AV_PIX_FMT_VUYX,        ///< packed VUYX 4:4:4, 32bpp, Variant of VUYA where alpha channel is left undefined
+
     AV_PIX_FMT_NB         ///< number of pixel formats, DO NOT USE THIS if you want to link with shared libav* because the number of formats might differ between versions
 };
 

libavutil/tests/pixfmt_best.c

@@ -84,6 +84,7 @@ int main(void)
     TEST(AV_PIX_FMT_GBRP,      AV_PIX_FMT_RGB24);
     TEST(AV_PIX_FMT_0RGB,      AV_PIX_FMT_RGB24);
     TEST(AV_PIX_FMT_GBRP16,    AV_PIX_FMT_RGB48);
+    TEST(AV_PIX_FMT_VUYX,      AV_PIX_FMT_YUV444P);
 
     // Formats additionally containing alpha (here ignored).
     TEST(AV_PIX_FMT_YA8,       AV_PIX_FMT_GRAY8);

libavutil/version.h

@@ -79,8 +79,8 @@
  */
 
 #define LIBAVUTIL_VERSION_MAJOR  57
-#define LIBAVUTIL_VERSION_MINOR  33
-#define LIBAVUTIL_VERSION_MICRO 101
+#define LIBAVUTIL_VERSION_MINOR  34
+#define LIBAVUTIL_VERSION_MICRO 100
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
                                                LIBAVUTIL_VERSION_MINOR, \

tests/ref/fate/imgutils

@@ -249,3 +249,4 @@ p416le          planes: 2, linesizes: 128 256   0   0, plane_sizes:  6144 12288
 vuya            planes: 1, linesizes: 256   0   0   0, plane_sizes: 12288     0     0     0, plane_offsets:     0     0     0, total_size: 12288
 rgbaf16be       planes: 1, linesizes: 512   0   0   0, plane_sizes: 24576     0     0     0, plane_offsets:     0     0     0, total_size: 24576
 rgbaf16le       planes: 1, linesizes: 512   0   0   0, plane_sizes: 24576     0     0     0, plane_offsets:     0     0     0, total_size: 24576
+vuyx            planes: 1, linesizes: 256   0   0   0, plane_sizes: 12288     0     0     0, plane_offsets:     0     0     0, total_size: 12288

tests/ref/fate/pixfmt_best

@@ -1 +1 @@
-74 tests passed, 0 tests failed.
+75 tests passed, 0 tests failed.

tests/ref/fate/sws-pixdesc-query

@@ -219,6 +219,7 @@ isYUV:
   uyvy422
   uyyvyy411
   vuya
+  vuyx
   xyz12be
   xyz12le
   y210be
@@ -753,6 +754,7 @@ Packed:
   uyvy422
   uyyvyy411
   vuya
+  vuyx
   x2bgr10be
   x2bgr10le
   x2rgb10be
@@ -984,5 +986,6 @@ SwappedChroma:
   nv21
   nv42
   vuya
+  vuyx
   yvyu422