lavu/pixfmt: add packed RGBA float16 format

This is the default format of the Windows compositor and what DXGI
Desktop Duplication will give you for any kind of HDR output.

libavutil/pixdesc.c

@@ -2504,6 +2504,34 @@ static const AVPixFmtDescriptor av_pix_fmt_descriptors[AV_PIX_FMT_NB] = {
         },
         .flags = AV_PIX_FMT_FLAG_ALPHA,
     },
+    [AV_PIX_FMT_RGBAF16BE] = {
+        .name = "rgbaf16be",
+        .nb_components = 4,
+        .log2_chroma_w = 0,
+        .log2_chroma_h = 0,
+        .comp = {
+            { 0, 8, 0, 0, 16 },       /* R */
+            { 0, 8, 2, 0, 16 },       /* G */
+            { 0, 8, 4, 0, 16 },       /* B */
+            { 0, 8, 6, 0, 16 },       /* A */
+        },
+        .flags = AV_PIX_FMT_FLAG_BE | AV_PIX_FMT_FLAG_RGB |
+                 AV_PIX_FMT_FLAG_ALPHA | AV_PIX_FMT_FLAG_FLOAT,
+    },
+    [AV_PIX_FMT_RGBAF16LE] = {
+        .name = "rgbaf16le",
+        .nb_components = 4,
+        .log2_chroma_w = 0,
+        .log2_chroma_h = 0,
+        .comp = {
+            { 0, 8, 0, 0, 16 },       /* R */
+            { 0, 8, 2, 0, 16 },       /* G */
+            { 0, 8, 4, 0, 16 },       /* B */
+            { 0, 8, 6, 0, 16 },       /* A */
+        },
+        .flags = AV_PIX_FMT_FLAG_RGB | AV_PIX_FMT_FLAG_ALPHA |
+                 AV_PIX_FMT_FLAG_FLOAT,
+    },
 };
 
 static const char * const color_range_names[] = {

libavutil/pixfmt.h

@@ -369,6 +369,9 @@ enum AVPixelFormat {
 
     AV_PIX_FMT_VUYA,        ///< packed VUYA 4:4:4, 32bpp, VUYAVUYA...
 
+    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_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
 };
 
@@ -466,6 +469,8 @@ enum AVPixelFormat {
 #define AV_PIX_FMT_P216       AV_PIX_FMT_NE(P216BE, P216LE)
 #define AV_PIX_FMT_P416       AV_PIX_FMT_NE(P416BE, P416LE)
 
+#define AV_PIX_FMT_RGBAF16    AV_PIX_FMT_NE(RGBAF16BE, RGBAF16LE)
+
 /**
   * Chromaticity coordinates of the source primaries.
   * These values match the ones defined by ISO/IEC 23091-2_2019 subclause 8.1 and ITU-T H.273.

libavutil/version.h

@@ -80,7 +80,7 @@
 
 #define LIBAVUTIL_VERSION_MAJOR  57
 #define LIBAVUTIL_VERSION_MINOR  33
-#define LIBAVUTIL_VERSION_MICRO 100
+#define LIBAVUTIL_VERSION_MICRO 101
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
                                                LIBAVUTIL_VERSION_MINOR, \

tests/ref/fate/imgutils

@@ -247,3 +247,5 @@ p216le          planes: 2, linesizes: 128 128   0   0, plane_sizes:  6144  6144
 p416be          planes: 2, linesizes: 128 256   0   0, plane_sizes:  6144 12288     0     0, plane_offsets:  6144     0     0, total_size: 18432
 p416le          planes: 2, linesizes: 128 256   0   0, plane_sizes:  6144 12288     0     0, plane_offsets:  6144     0     0, total_size: 18432
 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

tests/ref/fate/sws-pixdesc-query

@@ -21,6 +21,8 @@ is16BPS:
   rgb48le
   rgba64be
   rgba64le
+  rgbaf16be
+  rgbaf16le
   ya16be
   ya16le
   yuv420p16be
@@ -157,6 +159,7 @@ isBE:
   rgb555be
   rgb565be
   rgba64be
+  rgbaf16be
   x2bgr10be
   x2rgb10be
   xyz12be
@@ -479,6 +482,8 @@ isRGB:
   rgb8
   rgba64be
   rgba64le
+  rgbaf16be
+  rgbaf16le
   x2bgr10be
   x2bgr10le
   x2rgb10be
@@ -629,6 +634,8 @@ AnyRGB:
   rgb8
   rgba64be
   rgba64le
+  rgbaf16be
+  rgbaf16le
   x2bgr10be
   x2bgr10le
   x2rgb10be
@@ -655,6 +662,8 @@ ALPHA:
   rgb32_1
   rgba64be
   rgba64le
+  rgbaf16be
+  rgbaf16le
   vuya
   ya16be
   ya16le
@@ -739,6 +748,8 @@ Packed:
   rgb8
   rgba64be
   rgba64le
+  rgbaf16be
+  rgbaf16le
   uyvy422
   uyyvyy411
   vuya
@@ -918,6 +929,8 @@ PackedRGB:
   rgb8
   rgba64be
   rgba64le
+  rgbaf16be
+  rgbaf16le
   x2bgr10be
   x2bgr10le
   x2rgb10be