Added fourcc helpers and defines to centralize them.

It introduces a bunch of VLC_CODEC_* defines as a representative
fourcc for a codec. The fourccs have been chosen pretty much randomly
except when I knew well know ones.

It adds two helpers: vlc_fourcc_GetCodec and vlc_fourcc_GetDescription.

Don't hesitate if you have any comments.

src/Makefile.am

@@ -58,6 +58,7 @@ pluginsinclude_HEADERS = \
 	../include/vlc_es_out.h \
 	../include/vlc_events.h \
 	../include/vlc_filter.h \
+	../include/vlc_fourcc.h \
 	../include/vlc_gcrypt.h \
 	../include/vlc_httpd.h \
 	../include/vlc_image.h \
@@ -359,6 +360,7 @@ SOURCES_libvlc_common = \
 	misc/rand.c \
 	misc/mtime.c \
 	misc/block.c \
+	misc/fourcc.c \
 	misc/es_format.c \
 	modules/modules.h \
 	modules/modules.c \

src/libvlccore.sym

@@ -453,6 +453,8 @@ vlc_event_send
 __vlc_execve
 vlc_fastmem_register
 vlc_freeaddrinfo
+vlc_fourcc_GetClass
+vlc_fourcc_GetDescription
 vlc_gai_strerror
 vlc_gc_init
 vlc_getaddrinfo