Add FF_OPT_TYPE_BINARY and use it to add a cryptokey option

Originally committed as revision 11250 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/utils.c

@@ -323,6 +323,7 @@ static const AVOption options[]={
 {"track", " set the track number", OFFSET(track), FF_OPT_TYPE_INT, DEFAULT, 0, INT_MAX, E},
 {"year", "set the year", OFFSET(year), FF_OPT_TYPE_INT, DEFAULT, INT_MIN, INT_MAX, E},
 {"analyzeduration", "how many microseconds are analyzed to estimate duration", OFFSET(max_analyze_duration), FF_OPT_TYPE_INT, 3*AV_TIME_BASE, 0, INT_MAX, D},
+{"cryptokey", "decryption key", OFFSET(key), FF_OPT_TYPE_BINARY, 0, 0, 0, D},
 {NULL},
 };