avutil: Add NV24 and NV42 pixel formats

These are the 4:4:4 variants of the semi-planar NV12/NV21 formats.

These formats are not used much, so we've never had a reason to add
them until now. VDPAU recently added support HEVC 4:4:4 content
and when you use the OpenGL interop, the returned surfaces are in
NV24 format, so we need the pixel format for media players, even
if there's no direct use within ffmpeg.

Separately, there are apparently webcams that use NV24, but I've
never seen one.

libavutil/pixdesc.c

@@ -2320,6 +2320,30 @@ static const AVPixFmtDescriptor av_pix_fmt_descriptors[AV_PIX_FMT_NB] = {
         },
         .flags = AV_PIX_FMT_FLAG_PLANAR | AV_PIX_FMT_FLAG_ALPHA,
     },
+    [AV_PIX_FMT_NV24] = {
+        .name = "nv24",
+        .nb_components = 3,
+        .log2_chroma_w = 0,
+        .log2_chroma_h = 0,
+        .comp = {
+            { 0, 1, 0, 0, 8, 0, 7, 1 },        /* Y */
+            { 1, 2, 0, 0, 8, 1, 7, 1 },        /* U */
+            { 1, 2, 1, 0, 8, 1, 7, 2 },        /* V */
+        },
+        .flags = AV_PIX_FMT_FLAG_PLANAR,
+    },
+    [AV_PIX_FMT_NV42] = {
+        .name = "nv42",
+        .nb_components = 3,
+        .log2_chroma_w = 0,
+        .log2_chroma_h = 0,
+        .comp = {
+            { 0, 1, 0, 0, 8, 0, 7, 1 },        /* Y */
+            { 1, 2, 1, 0, 8, 1, 7, 2 },        /* U */
+            { 1, 2, 0, 0, 8, 1, 7, 1 },        /* V */
+        },
+        .flags = AV_PIX_FMT_FLAG_PLANAR,
+    },
 };
 #if FF_API_PLUS1_MINUS1
 FF_ENABLE_DEPRECATION_WARNINGS

libavutil/pixfmt.h

@@ -345,6 +345,9 @@ enum AVPixelFormat {
     AV_PIX_FMT_YUVA444P12BE, ///< planar YUV 4:4:4,36bpp, (1 Cr & Cb sample per 1x1 Y samples), 12b alpha, big-endian
     AV_PIX_FMT_YUVA444P12LE, ///< planar YUV 4:4:4,36bpp, (1 Cr & Cb sample per 1x1 Y samples), 12b alpha, little-endian
 
+    AV_PIX_FMT_NV24,      ///< planar YUV 4:4:4, 24bpp, 1 plane for Y and 1 plane for the UV components, which are interleaved (first byte U and the following byte V)
+    AV_PIX_FMT_NV42,      ///< as above, but U and V bytes are swapped
+
     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

@@ -76,6 +76,7 @@ int main(void)
     TEST(AV_PIX_FMT_P010,      AV_PIX_FMT_YUV420P10);
     TEST(AV_PIX_FMT_P016,      AV_PIX_FMT_YUV420P16);
     TEST(AV_PIX_FMT_NV16,      AV_PIX_FMT_YUV422P);
+    TEST(AV_PIX_FMT_NV24,      AV_PIX_FMT_YUV444P);
     TEST(AV_PIX_FMT_YUYV422,   AV_PIX_FMT_YUV422P);
     TEST(AV_PIX_FMT_UYVY422,   AV_PIX_FMT_YUV422P);
     TEST(AV_PIX_FMT_BGR565,    AV_PIX_FMT_RGB565);

libavutil/version.h

@@ -79,8 +79,8 @@
  */
 
 #define LIBAVUTIL_VERSION_MAJOR  56
-#define LIBAVUTIL_VERSION_MINOR  26
-#define LIBAVUTIL_VERSION_MICRO 101
+#define LIBAVUTIL_VERSION_MINOR  27
+#define LIBAVUTIL_VERSION_MICRO 100
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
                                                LIBAVUTIL_VERSION_MINOR, \

tests/ref/fate/pixfmt_best

@@ -1 +1 @@
-72 tests passed, 0 tests failed.
+73 tests passed, 0 tests failed.