AAC in ASF does not need parsing.

Originally committed as revision 17466 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/asf.c

@@ -285,7 +285,11 @@ static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
                     st->codec->codec_id = CODEC_ID_PROBE;
                     st->codec->codec_tag = 0;
                 }
+                if (st->codec->codec_id == CODEC_ID_AAC) {
+                    st->need_parsing = AVSTREAM_PARSE_NONE;
+                } else {
                 st->need_parsing = AVSTREAM_PARSE_FULL;
+                }
                 /* We have to init the frame size at some point .... */
                 pos2 = url_ftell(pb);
                 if (gsize >= (pos2 + 8 - pos1 + 24)) {