Add PIX_FMT_Y400A, 8bit gray, 8bit alpha

Originally committed as revision 22881 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/imgconvert.c

@@ -602,6 +602,7 @@ int ff_fill_pointer(AVPicture *picture, uint8_t *ptr, enum PixelFormat pix_fmt,
     case PIX_FMT_BGR4:
     case PIX_FMT_MONOWHITE:
     case PIX_FMT_MONOBLACK:
+    case PIX_FMT_Y400A:
         picture->data[0] = ptr;
         picture->data[1] = NULL;
         picture->data[2] = NULL;

libavutil/pixdesc.c

@@ -779,6 +779,14 @@ const AVPixFmtDescriptor av_pix_fmt_descriptors[PIX_FMT_NB] = {
         .log2_chroma_h = 1,
         .flags = PIX_FMT_HWACCEL,
     },
+    [PIX_FMT_Y400A] = {
+        .name = "y400a",
+        .nb_components= 2,
+        .comp = {
+            {0,1,1,0,7},        /* Y */
+            {0,1,2,0,7},        /* A */
+        },
+    },
 };
 
 static enum PixelFormat get_pix_fmt_internal(const char *name)

libavutil/pixfmt.h

@@ -132,6 +132,7 @@ enum PixelFormat {
     PIX_FMT_RGB444LE,  ///< packed RGB 4:4:4, 16bpp, (msb)4A 4R 4G 4B(lsb), little-endian, most significant bits to 0
     PIX_FMT_BGR444BE,  ///< packed BGR 4:4:4, 16bpp, (msb)4A 4B 4G 4R(lsb), big-endian, most significant bits to 1
     PIX_FMT_BGR444LE,  ///< packed BGR 4:4:4, 16bpp, (msb)4A 4B 4G 4R(lsb), little-endian, most significant bits to 1
+    PIX_FMT_Y400A,     ///< 8bit gray, 8bit alpha
     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
 };