MPEG-4 SLS: Difference between revisions
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*Company: [[Moving Picture Experts Group|MPEG]]/Infocomm Research (I<sup>2</sup>R) | *Company: [[Moving Picture Experts Group|MPEG]]/Infocomm Research (I<sup>2</sup>R) | ||
*Whitepaper: http:// | *Whitepaper: http://mpeg.chiariglione.org/technologies/mpeg-4/mp04-sls/index.htm | ||
*Reference Software: http://standards.iso.org/ittf/PubliclyAvailableStandards/c052968_ISOIEC_14496-5_2001_Amd_10_2007_Cor_3_2009_Reference_Software.zip | *Reference Software: http://standards.iso.org/ittf/PubliclyAvailableStandards/c052968_ISOIEC_14496-5_2001_Amd_10_2007_Cor_3_2009_Reference_Software.zip | ||
*Samples: sls* files at ftp://mpaudconf:adif2mp4@ftp.iis.fhg.de/mpeg4audio-conformance/compressedMp4/ | *Samples: sls* files at ftp://mpaudconf:adif2mp4@ftp.iis.fhg.de/mpeg4audio-conformance/compressedMp4/ | ||
*Specification: ISO/IEC 14496-3: | *Specification: ISO/IEC 14496-3:2009 ([http://www.itscj.ipsj.or.jp/sc29/open/29view/29n6475t.doc Draft]) | ||
SLS is MPEG-4's hybrid lossless audio codec. It uses a standard MPEG-4 GA core layer. Valid cores include [[AAC]]-LC, AAC Scalable (without LTP), ER AAC LC, ER AAC Scalable, and ER BSAC. It can also operate without a core layer. The core layer is decoded with a fixed integer approximation. Then one of more Lossless enhancement layers may be added. Lossless enhancement layers are entropy coded with either Bit-Plane Golomb Codes (BPGC) or Context Based Arithmetic Codes (CBAC) and Low Energy Mode Codes (LEMC). SLS can also oversample the core coder by up to a factor of 2 or 4. | SLS is MPEG-4's hybrid lossless audio codec. It uses a standard MPEG-4 GA core layer. Valid cores include [[AAC]]-LC, AAC Scalable (without LTP), ER AAC LC, ER AAC Scalable, and ER BSAC. It can also operate without a core layer. The core layer is decoded with a fixed integer approximation. Then one of more Lossless enhancement layers may be added. Lossless enhancement layers are entropy coded with either Bit-Plane Golomb Codes (BPGC) or Context Based Arithmetic Codes (CBAC) and Low Energy Mode Codes (LEMC). SLS can also oversample the core coder by up to a factor of 2 or 4. | ||
Latest revision as of 09:53, 3 April 2010
- Company: MPEG/Infocomm Research (I2R)
- Whitepaper: http://mpeg.chiariglione.org/technologies/mpeg-4/mp04-sls/index.htm
- Reference Software: http://standards.iso.org/ittf/PubliclyAvailableStandards/c052968_ISOIEC_14496-5_2001_Amd_10_2007_Cor_3_2009_Reference_Software.zip
- Samples: sls* files at ftp://mpaudconf:adif2mp4@ftp.iis.fhg.de/mpeg4audio-conformance/compressedMp4/
- Specification: ISO/IEC 14496-3:2009 (Draft)
SLS is MPEG-4's hybrid lossless audio codec. It uses a standard MPEG-4 GA core layer. Valid cores include AAC-LC, AAC Scalable (without LTP), ER AAC LC, ER AAC Scalable, and ER BSAC. It can also operate without a core layer. The core layer is decoded with a fixed integer approximation. Then one of more Lossless enhancement layers may be added. Lossless enhancement layers are entropy coded with either Bit-Plane Golomb Codes (BPGC) or Context Based Arithmetic Codes (CBAC) and Low Energy Mode Codes (LEMC). SLS can also oversample the core coder by up to a factor of 2 or 4.
The pre-standardized name for SLS was Advanced Audio Zip (AAZ).
HD-AAC
- Company: MPEG/Fraunhofer/Infocomm Research (I2R)
- Homepage: http://www.iis.fraunhofer.de/EN/bf/amm/projects/lossless/
- Specification: ISO/IEC 14496-3:2009/Amd.1 (Draft)
The HD-AAC Profile is a limited subset of MPEG-4 SLS in an effort to gain commercial adoption. HD-AAC limits SLS to an AAC-LC core and BPGC with LEMC entropy coding.