Difference between revisions of "Advanced Audio Coding"

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m (Supported by FFmpeg)
(add fourcc, link to android aac decoder, fix formatting, add samples)
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* FOURCCS: ????
* FourCC: AAC AACP MP4A mp4a VLB
* Company: [[ISO]]
* Company: [[ISO]]
* Samples: http://samples.mplayerhq.hu/A-codecs/AAC/
* Samples: [http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_IEC_14496-4_2004_Conformance_Testing/audio_conformance/mpeg4audio-conformance/compressedMp4/ sample repo at standards.iso.org]
* Sample Docs: [http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_IEC_14496-4_2004_Conformance_Testing/audio_conformance/mpeg4audio-conformance/doc/fileNameConventions.html sample docs]


Specification and reference source links.
Specification and reference source links.
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/


[[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
[[Google]] has opensourced Android, which includes an Apache 2.0 licensed aac decoder:  
*http://git.source.android.com/?p=platform/external/opencore.git;a=tree;f=codecs_v2/audio/aac/dec;hb=HEAD


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


Usually stored in an [[MP4]] container.
Usually stored in an [[MP4]] container.

Revision as of 07:11, 23 October 2008

Specification and reference source links.

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.

GAIN headers

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