Difference between revisions of "Advanced Audio Coding"

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(→‎AAC+: Typos)
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=== AAC+ ===
=== AAC+ ===


[http://www.codingtechnologies.com/products/aacPlus.htm AACPlus] (a.k.a. AAC+) is HE-AAC + [http://www.codingtechnologies.com/products/sbr.htm SBR (Spectral Band Replication)] and aacPlus v2 means HE-AAC + [http://www.codingtechnologies.com/products/sbr.htm SBR (Spectral Band Replication)] + [http://www.codingtechnologies.com/products/paraSter.htm PS (Parametric Stereo)]. Standard HE-AAC decoders can decode aacPlus encoded files/streams but without [http://www.codingtechnologies.com/products/sbr.htm SBR] and [http://www.codingtechnologies.com/products/paraSter.htm PS] you do not get the full quality.
[http://www.codingtechnologies.com/products/aacPlus.htm AACPlus] (a.k.a. AAC+) is LC-AAC + [http://www.codingtechnologies.com/products/sbr.htm SBR (Spectral Band Replication)] and aacPlus v2 means LC-AAC + [http://www.codingtechnologies.com/products/sbr.htm SBR (Spectral Band Replication)] + [http://www.codingtechnologies.com/products/paraSter.htm PS (Parametric Stereo)]. Standard LC-AAC decoders can decode aacPlus encoded files/streams but without [http://www.codingtechnologies.com/products/sbr.htm SBR] and [http://www.codingtechnologies.com/products/paraSter.htm PS] you do not get the full quality.


* See also
* See also

Revision as of 03:15, 21 August 2008

  • FOURCCS: ????
  • Company: ISO

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/

Intel has source for its IPP based AAC decoder: http://www.intel.com/cd/software/products/asmo-na/eng/perflib/ipp/219611.htm?prn=y

Real Networks has source for its Helix AAC fixedpoint decoder here: https://datatype.helixcommunity.org/2005/aacfixptdec

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.

GAIN headers

See http://mp3gain.sourceforge.net and MP3 GAIN header.