pixfmt: Add GRAY12

doc/APIchanges

@@ -13,6 +13,9 @@ libavutil:     2015-08-28
 
 API changes, most recent first:
 
+2016-xx-xx - xxxxxxx - lavu 55.28.0 - pixfmt.h
+  Add AV_PIX_FMT_GRAY12(LE/BE).
+
 2016-xx-xx - xxxxxxx - lavu 55.27.0 - hwcontext.h
   Add av_hwframe_map() and associated AV_HWFRAME_MAP_* flags.
   Add av_hwframe_ctx_create_derived().

libavutil/pixdesc.c

@@ -493,6 +493,27 @@ static const AVPixFmtDescriptor av_pix_fmt_descriptors[AV_PIX_FMT_NB] = {
         },
         .flags = AV_PIX_FMT_FLAG_RGB | AV_PIX_FMT_FLAG_ALPHA,
     },
+    [AV_PIX_FMT_GRAY12BE] = {
+        .name = "gray12be",
+        .nb_components = 1,
+        .log2_chroma_w = 0,
+        .log2_chroma_h = 0,
+        .comp = {
+            { 0, 2, 0, 0, 12, 1, 11, 1 },       /* Y */
+        },
+        .flags = AV_PIX_FMT_FLAG_BE,
+        .alias = "y12be",
+    },
+    [AV_PIX_FMT_GRAY12LE] = {
+        .name = "gray12le",
+        .nb_components = 1,
+        .log2_chroma_w = 0,
+        .log2_chroma_h = 0,
+        .comp = {
+            { 0, 2, 0, 0, 12, 1, 11, 1 },       /* Y */
+        },
+        .alias = "y12le",
+    },
     [AV_PIX_FMT_GRAY16BE] = {
         .name = "gray16be",
         .nb_components = 1,
@@ -1950,6 +1971,7 @@ enum AVPixelFormat av_pix_fmt_swap_endianness(enum AVPixelFormat pix_fmt)
     case AV_PIX_FMT_ ## fmt ## LE: return AV_PIX_FMT_ ## fmt ## BE
 
     switch (pix_fmt) {
+    PIX_FMT_SWAP_ENDIANNESS(GRAY12);
     PIX_FMT_SWAP_ENDIANNESS(GRAY16);
     PIX_FMT_SWAP_ENDIANNESS(YA16);
     PIX_FMT_SWAP_ENDIANNESS(RGB48);

libavutil/pixfmt.h

@@ -245,6 +245,9 @@ enum AVPixelFormat {
     AV_PIX_FMT_GBRAP12BE,  ///< planar GBR 4:4:4:4 48bpp, big-endian
     AV_PIX_FMT_GBRAP12LE,  ///< planar GBR 4:4:4:4 48bpp, little-endian
 
+    AV_PIX_FMT_GRAY12BE,  ///<        Y        , 12bpp, big-endian
+    AV_PIX_FMT_GRAY12LE,  ///<        Y        , 12bpp, 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
 };
 
@@ -259,6 +262,7 @@ enum AVPixelFormat {
 #define AV_PIX_FMT_BGR32   AV_PIX_FMT_NE(ABGR, RGBA)
 #define AV_PIX_FMT_BGR32_1 AV_PIX_FMT_NE(BGRA, ARGB)
 
+#define AV_PIX_FMT_GRAY12 AV_PIX_FMT_NE(GRAY12BE, GRAY12LE)
 #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)

libavutil/version.h

@@ -54,7 +54,7 @@
  */
 
 #define LIBAVUTIL_VERSION_MAJOR 55
-#define LIBAVUTIL_VERSION_MINOR 27
+#define LIBAVUTIL_VERSION_MINOR 28
 #define LIBAVUTIL_VERSION_MICRO  0
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \