Import Dirac demuxer/muxer from SoC branch; written by Marco Gerards,

patch extracted by Anuradha Suraparaju anuradhaAtrdDoTbbcDoTcoDoTuk.

Originally committed as revision 13031 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/allformats.c

@@ -69,6 +69,7 @@ void av_register_all(void)
     REGISTER_DEMUXER  (C93, c93);
     REGISTER_MUXER    (CRC, crc);
     REGISTER_DEMUXER  (DAUD, daud);
+    REGISTER_MUXDEMUX (DIRAC, dirac);
     REGISTER_DEMUXER  (DSICIN, dsicin);
     REGISTER_MUXDEMUX (DTS, dts);
     REGISTER_MUXDEMUX (DV, dv);