video: Add RGB10A2_LE pixel format

Packed 10 bits per each R, G and B channel with MSB 2bits alpha channel.
This format is mapped to Windows' DXGI_FORMAT_R10G10B10A2_UNORM format which is
required for 10bits HDR rendering.

Note that this RGB10A2_LE format is R - B channel swapped version of BGR10A2_LE

gst-libs/gst/video/video-converter.c

@@ -5900,6 +5900,7 @@ get_scale_format (GstVideoFormat format, gint plane)
     case GST_VIDEO_FORMAT_NV16_10LE32:
     case GST_VIDEO_FORMAT_NV12_10LE40:
     case GST_VIDEO_FORMAT_BGR10A2_LE:
+    case GST_VIDEO_FORMAT_RGB10A2_LE:
       res = format;
       g_assert_not_reached ();
       break;

gst-libs/gst/video/video-format.c

@@ -5338,6 +5338,66 @@ pack_bgr10a2_le (const GstVideoFormatInfo * info, GstVideoPackFlags flags,
   }
 }
 
+#define PACK_RGB10A2_LE GST_VIDEO_FORMAT_ARGB64, unpack_rgb10a2_le, 1, pack_rgb10a2_le
+static void
+unpack_rgb10a2_le (const GstVideoFormatInfo * info, GstVideoPackFlags flags,
+    gpointer dest, const gpointer data[GST_VIDEO_MAX_PLANES],
+    const gint stride[GST_VIDEO_MAX_PLANES], gint x, gint y, gint width)
+{
+  int i;
+  const guint8 *restrict s = GET_LINE (y);
+  guint16 *restrict d = dest;
+  guint32 ARGB;
+  guint16 A, R, G, B;
+
+  s += x * 4;
+
+  for (i = 0; i < width; i++) {
+    ARGB = GST_READ_UINT32_LE (s + 4 * i);
+
+    R = ((ARGB >> 0) & 0x3ff) << 6;
+    G = ((ARGB >> 10) & 0x3ff) << 6;
+    B = ((ARGB >> 20) & 0x3ff) << 6;
+    A = ((ARGB >> 30) & 0x03) << 14;
+
+    if (!(flags & GST_VIDEO_PACK_FLAG_TRUNCATE_RANGE)) {
+      R |= (R >> 10);
+      G |= (G >> 10);
+      B |= (B >> 10);
+      A |= (A >> 10);
+    }
+
+    d[4 * i + 0] = A;
+    d[4 * i + 1] = R;
+    d[4 * i + 2] = G;
+    d[4 * i + 3] = B;
+  }
+}
+
+static void
+pack_rgb10a2_le (const GstVideoFormatInfo * info, GstVideoPackFlags flags,
+    const gpointer src, gint sstride, gpointer data[GST_VIDEO_MAX_PLANES],
+    const gint stride[GST_VIDEO_MAX_PLANES], GstVideoChromaSite chroma_site,
+    gint y, gint width)
+{
+  int i;
+  guint32 *restrict d = GET_LINE (y);
+  const guint16 *restrict s = src;
+  guint32 ARGB;
+  guint16 A, R, G, B;
+
+  for (i = 0; i < width; i++) {
+    A = s[4 * i] & 0xc000;
+    R = s[4 * i + 1] & 0xffc0;
+    G = s[4 * i + 2] & 0xffc0;
+    B = s[4 * i + 3] & 0xffc0;
+
+    ARGB = (R >> 6) | (G << 4) | (B << 14) | (A << 16);
+
+    GST_WRITE_UINT32_LE (d + i, ARGB);
+  }
+}
+
 typedef struct
 {
   guint32 fourcc;
@@ -5670,6 +5730,8 @@ static const VideoFormat formats[] = {
   MAKE_RGBA_LE_PACK_FORMAT (BGR10A2_LE, "raw video", DPTH10_10_10_2, PSTR4444,
       PLANE0,
       OFFS0, SUB4444, PACK_BGR10A2_LE),
+  MAKE_RGBA_LE_PACK_FORMAT (RGB10A2_LE, "raw video", DPTH10_10_10_2, PSTR4444,
+      PLANE0, OFFS0, SUB4444, PACK_RGB10A2_LE),
 };
 
 static GstVideoFormat
@@ -5804,6 +5866,9 @@ gst_video_format_from_masks (gint depth, gint bpp, gint endianness,
 
   if (depth == 32 && bpp == 32 && alpha_mask == 0xc0000000 &&
       endianness == G_LITTLE_ENDIAN) {
+    if (red_mask == 0x3ff00000)
+      format = GST_VIDEO_FORMAT_RGB10A2_LE;
+    else
       format = GST_VIDEO_FORMAT_BGR10A2_LE;
   } else if (depth == 30 && bpp == 32) {
     format = GST_VIDEO_FORMAT_r210;

gst-libs/gst/video/video-format.h

@@ -118,6 +118,7 @@ G_BEGIN_DECLS
  * @GST_VIDEO_FORMAT_Y410: packed 4:4:4 YUV, 10 bits per channel(A-V-Y-U...) (Since: 1.16)
  * @GST_VIDEO_FORMAT_VUYA: packed 4:4:4 YUV with alpha channel (V0-U0-Y0-A0...) (Since: 1.16)
  * @GST_VIDEO_FORMAT_BGR10A2_LE: packed 4:4:4 RGB with alpha channel(B-G-R-A), 10 bits for R/G/B channel and MSB 2 bits for alpha channel (Since: 1.16)
+ * @GST_VIDEO_FORMAT_RGB10A2_LE: packed 4:4:4 RGB with alpha channel(R-G-B-A), 10 bits for R/G/B channel and MSB 2 bits for alpha channel (Since: 1.18)
  *
  * Enum value describing the most common video formats.
  *
@@ -211,6 +212,7 @@ typedef enum {
   GST_VIDEO_FORMAT_Y410,
   GST_VIDEO_FORMAT_VUYA,
   GST_VIDEO_FORMAT_BGR10A2_LE,
+  GST_VIDEO_FORMAT_RGB10A2_LE,
 } GstVideoFormat;
 
 #define GST_VIDEO_MAX_PLANES 4
@@ -560,7 +562,7 @@ gconstpointer  gst_video_format_get_palette          (GstVideoFormat format, gsi
   "AYUV64, r210, I420_10BE, I420_10LE, I422_10BE, I422_10LE, Y444_10BE, " \
   "Y444_10LE, GBR, GBR_10BE, GBR_10LE, NV16, NV24, NV12_64Z32, A420_10BE, " \
   "A420_10LE, A422_10BE, A422_10LE, A444_10BE, A444_10LE, NV61, P010_10BE, " \
-  "P010_10LE, IYU2, VYUY, GBRA, GBRA_10BE, GBRA_10LE, BGR10A2_LE, GBR_12BE, GBR_12LE, " \
+  "P010_10LE, IYU2, VYUY, GBRA, GBRA_10BE, GBRA_10LE, BGR10A2_LE, RGB10A2_LE, GBR_12BE, GBR_12LE, " \
   "GBRA_12BE, GBRA_12LE, I420_12BE, I420_12LE, I422_12BE, I422_12LE, " \
   "Y444_12BE, Y444_12LE, GRAY10_LE32, NV12_10LE32, NV16_10LE32, NV12_10LE40 }"
 

gst-libs/gst/video/video-info.c

@@ -791,6 +791,7 @@ fill_planes (GstVideoInfo * info)
     case GST_VIDEO_FORMAT_Y410:
     case GST_VIDEO_FORMAT_VUYA:
     case GST_VIDEO_FORMAT_BGR10A2_LE:
+    case GST_VIDEO_FORMAT_RGB10A2_LE:
       info->stride[0] = width * 4;
       info->offset[0] = 0;
       info->size = info->stride[0] * height;