This is patch for ffmpeg to enable aac+ encoding support thru libaacplus.
Output formats, that works: aac (adts), mp4.
Command line examples:

Encoding stereo SBR only into mp4 container:
ffmpeg -i source.mp2 -f aac -acodec libaacplus -ab 64k -ac 2 -ar 44100 -y sample64.mp4

Encoding stereo SBR+PS (ps selected, if output bitrate is lower than 44001 Bps) into aac container:
ffmpeg -i source.mp2 -f aac -acodec libaacplus -ab 32k -ac 2 -ar 44100 -y sample32.aac

Mono encoding implemented too.