I have substituted the FFmpeg MDCT implementation with the one from libvorbis, which is faster. The only side-effect is that there are 2 files now (mdct.c, mdct.h) which fall under the Xiph BSD-style license rather than the LGPL like the rest of Aften.
The AC-3 short-block MDCT is not a standard MDCT, so I had to modify it a bit to get it to work properly. The result is a small slow-down (but still faster than the previous MDCT) which I hope to fix before too long.
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