DPX (Digital Picture Exchange) image decoder

patch by Jimmy Christensen, jimmy ghost dk

Originally committed as revision 19163 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/img2.c

@@ -72,6 +72,7 @@ static const IdStrMap img_tags[] = {
     { CODEC_ID_SUNRAST   , "im24"},
     { CODEC_ID_SUNRAST   , "sunras"},
     { CODEC_ID_JPEG2000  , "jp2"},
+    { CODEC_ID_DPX       , "dpx"},
     { CODEC_ID_NONE      , NULL}
 };