add isBE()

Originally committed as revision 29212 to svn://svn.mplayerhq.hu/mplayer/trunk/libswscale

libswscale/swscale_internal.h

@@ -291,6 +291,7 @@ void ff_yuv2packedX_altivec(SwsContext *c,
 const char *sws_format_name(int format);
 
 //FIXME replace this with something faster
+#define isBE(x) ((x)&1)
 #define isPlanarYUV(x)  (           \
            (x)==PIX_FMT_YUV410P     \
         || (x)==PIX_FMT_YUV420P     \