There is a lot of activity regarding AAC in FFMPEG since July.

The AAC decoder from Summer Of Code (SOC) 2006 is now included within the official FFMPEG tree, after cleanups by Robert Swain. It an AAC-LC and AAC-Main profiles decoder, so it can not yet replace FAAD/FAAD2 as it doesn't decode SBR and PS (used within HE-AAC and HE-AACv2), but it's a good step in the right direction. There is also an SBR decoder in the work, so we will perhaps see this in a few months.

On the encoder side, Konstantin Shishkov has been working on an AAC-LC encoder this summer. While it is not yet competitive with the best AAC-LC encoders, it already provides a good features set, and best of all, it features a psychoacoustic model (it should be the first psychoacoustic model to hit FFMPEG). The psy model is inspired from the 3GPP model, which is a stripped down encoder from Coding Technologies, provided with some basic documentation of the algorithms.

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