avutil: add AV_PIX_FMT_YA16 pixel format

doc/APIchanges

@@ -13,6 +13,9 @@ libavutil:     2013-12-xx
 
 API changes, most recent first:
 
+2014-08-xx - xxxxxxx - lavu 53.22.0 - pixfmt.h
+  Add AV_PIX_FMT_YA16 pixel format for 16 bit packed gray with alpha.
+
 2014-08-xx - xxxxxxx - lavu 53.21.1 - avstring.h
   Rename AV_PIX_FMT_Y400A to AV_PIX_FMT_YA8 to better identify the format.
   An alias pixel format and color space name are provided for compatibility.

libavutil/pixdesc.c

@@ -1349,6 +1349,24 @@ const AVPixFmtDescriptor av_pix_fmt_descriptors[AV_PIX_FMT_NB] = {
         .flags = AV_PIX_FMT_FLAG_ALPHA,
         .alias = "gray8a",
     },
+    [AV_PIX_FMT_YA16LE] = {
+        .name = "ya16le",
+        .nb_components = 2,
+        .comp = {
+            { 0, 3, 1, 0, 15 },        /* Y */
+            { 0, 3, 3, 0, 15 },        /* A */
+        },
+        .flags = AV_PIX_FMT_FLAG_ALPHA,
+    },
+    [AV_PIX_FMT_YA16BE] = {
+        .name = "ya16be",
+        .nb_components = 2,
+        .comp = {
+            { 0, 3, 1, 0, 15 },        /* Y */
+            { 0, 3, 3, 0, 15 },        /* A */
+        },
+        .flags = AV_PIX_FMT_FLAG_BE | AV_PIX_FMT_FLAG_ALPHA,
+    },
     [AV_PIX_FMT_GBRP] = {
         .name = "gbrp",
         .nb_components = 3,
@@ -1640,6 +1658,7 @@ enum AVPixelFormat av_pix_fmt_swap_endianness(enum AVPixelFormat pix_fmt)
 
     switch (pix_fmt) {
     PIX_FMT_SWAP_ENDIANNESS(GRAY16);
+    PIX_FMT_SWAP_ENDIANNESS(YA16);
     PIX_FMT_SWAP_ENDIANNESS(RGB48);
     PIX_FMT_SWAP_ENDIANNESS(RGB565);
     PIX_FMT_SWAP_ENDIANNESS(RGB555);

libavutil/pixfmt.h

@@ -202,6 +202,10 @@ enum AVPixelFormat {
     AV_PIX_FMT_YVYU422,   ///< packed YUV 4:2:2, 16bpp, Y0 Cr Y1 Cb
 
     AV_PIX_FMT_VDA,          ///< HW acceleration through VDA, data[3] contains a CVPixelBufferRef
+
+    AV_PIX_FMT_YA16BE,       ///< 16bit gray, 16bit alpha (big-endian)
+    AV_PIX_FMT_YA16LE,       ///< 16bit gray, 16bit alpha (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
 
 #if FF_API_PIX_FMT
@@ -221,6 +225,7 @@ enum AVPixelFormat {
 #define AV_PIX_FMT_BGR32_1 AV_PIX_FMT_NE(BGRA, ARGB)
 
 #define AV_PIX_FMT_GRAY16 AV_PIX_FMT_NE(GRAY16BE, GRAY16LE)
+#define AV_PIX_FMT_YA16   AV_PIX_FMT_NE(YA16BE,   YA16LE)
 #define AV_PIX_FMT_RGB48  AV_PIX_FMT_NE(RGB48BE,  RGB48LE)
 #define AV_PIX_FMT_RGB565 AV_PIX_FMT_NE(RGB565BE, RGB565LE)
 #define AV_PIX_FMT_RGB555 AV_PIX_FMT_NE(RGB555BE, RGB555LE)

libavutil/version.h

@@ -54,8 +54,8 @@
  */
 
 #define LIBAVUTIL_VERSION_MAJOR 53
-#define LIBAVUTIL_VERSION_MINOR 21
-#define LIBAVUTIL_VERSION_MICRO  1
+#define LIBAVUTIL_VERSION_MINOR 22
+#define LIBAVUTIL_VERSION_MICRO  0
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
                                                LIBAVUTIL_VERSION_MINOR, \