pixfmt: add AV_ prefixes to PIX_FMT_*

doc/APIchanges

@@ -13,6 +13,14 @@ libavutil:     2011-04-18
 
 API changes, most recent first:
 
+2012-10-xx - xxxxxxx - lavu 51.42.0 - pixfmt.h
+  Rename PixelFormat to AVPixelFormat and all PIX_FMT_* to AV_PIX_FMT_*.
+  To provide backwards compatibility, PixelFormat is now #defined as
+  AVPixelFormat.
+  Note that this can break user code that includes pixfmt.h and uses the
+  'PixelFormat' identifier. Such code should either #undef PixelFormat
+  or stop using the PixelFormat name.
+
 2012-10-05 - e7ba5b1 - lavr 1.0.0 - avresample.h
   Data planes parameters to avresample_convert() and
   avresample_read() are now uint8_t** instead of void**.

libavutil/Makefile

@@ -29,6 +29,7 @@ HEADERS = adler32.h                                                     \
           md5.h                                                         \
           mem.h                                                         \
           dict.h                                                        \
+          old_pix_fmt.h                                                 \
           opt.h                                                         \
           parseutils.h                                                  \
           pixdesc.h                                                     \

libavutil/version.h

@@ -37,8 +37,8 @@
  */
 
 #define LIBAVUTIL_VERSION_MAJOR 51
-#define LIBAVUTIL_VERSION_MINOR 41
-#define LIBAVUTIL_VERSION_MICRO  1
+#define LIBAVUTIL_VERSION_MINOR 42
+#define LIBAVUTIL_VERSION_MICRO  0
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
                                                LIBAVUTIL_VERSION_MINOR, \
@@ -73,6 +73,9 @@
 #ifndef FF_API_OLD_AVOPTIONS
 #define FF_API_OLD_AVOPTIONS            (LIBAVUTIL_VERSION_MAJOR < 52)
 #endif
+#ifndef FF_API_PIX_FMT
+#define FF_API_PIX_FMT                  (LIBAVUTIL_VERSION_MAJOR < 52)
+#endif
 
 /**
  * @}