Advanced Audio Coding

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Specification and reference source links.

Implementations with source code:

Other Notable Implementations:

Usually stored in an MP4 container.

See also Understanding AAC.



HE-AAC (also known as by the Dolby trade name aacPlus) is AAC-LC + SBR (Spectral Band Replication) and HE-AAC v2 (aacPlus v2) is LC-AAC + SBR + PS (Parametric Stereo). Standard AAC-LC decoders can decode HE-AAC encoded files/streams but without SBR and PS you do not get the full quality.

GAIN headers

See and MP3 GAIN header.