Add jp2 support to img2 demuxer.

On behalf of Jai Menon

Originally committed as revision 16187 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/img2.c

@@ -70,6 +70,7 @@ static const IdStrMap img_tags[] = {
     { CODEC_ID_SUNRAST   , "im8"},
     { CODEC_ID_SUNRAST   , "im24"},
     { CODEC_ID_SUNRAST   , "sunras"},
+    { CODEC_ID_JPEG2000  , "jp2"},
     { CODEC_ID_NONE      , NULL}
 };