Advanced Audio Coding
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| Revision as of 15:11, 23 October 2008 Compn (Talk | contribs) (add fourcc, link to android aac decoder, fix formatting, add samples) ← Previous diff |
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| *http://www.3gpp.org/ftp/specs/html-info/26-series.htm | *http://www.3gpp.org/ftp/specs/html-info/26-series.htm | ||
| *ftp://ftp.tnt.uni-hannover.de/pub/MPEG/audio/mpeg4/ | *ftp://ftp.tnt.uni-hannover.de/pub/MPEG/audio/mpeg4/ | ||
| + | *[[AAC Reference Software]] | ||
| [[Google]] has opensourced Android, which includes an Apache 2.0 licensed aac decoder: | [[Google]] has opensourced Android, which includes an Apache 2.0 licensed aac decoder: | ||
Revision as of 02:48, 16 February 2009
- FourCC: AAC AACP MP4A mp4a VLB
- Company: ISO
- Samples: http://samples.mplayerhq.hu/A-codecs/AAC/
- Samples: sample repo at standards.iso.org
- Sample Docs: sample docs
Specification and reference source links.
- http://www.3gpp.org/ftp/specs/html-info/26-series.htm
- ftp://ftp.tnt.uni-hannover.de/pub/MPEG/audio/mpeg4/
- AAC Reference Software
Google has opensourced Android, which includes an Apache 2.0 licensed aac decoder:
Intel has source for its IPP based AAC decoder:
Real Networks has source for its Helix AAC fixedpoint decoder here:
Usually stored in an MP4 container.
See also Understanding AAC.
Extensions
AAC+
AACPlus (a.k.a. AAC+) is LC-AAC + SBR (Spectral Band Replication) and aacPlus v2 means LC-AAC + SBR (Spectral Band Replication) + PS (Parametric Stereo). Standard LC-AAC decoders can decode aacPlus encoded files/streams but without SBR and PS you do not get the full quality.
- See also
- MP3PRO that also uses SBR.
- MPEG Surround that can used for all audio but especially MP3/mp3PRO and AAC/aacPlus. MPEG Surround technology share similar characteristics with SBR (Spectral Band Replication) and PS (Parametric Stereo), which MP3PRO and AAC+ decoders also use. DivX Inc. is one company that uses MPEG Surround technology to achieve 5.1 channel surround sound in smaller files.
