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Páginas: 89 (22050 palabras) Publicado: 8 de noviembre de 2009
ITU-T
TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU

Technical Paper
(6 February 2009)

SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMS Infrastructure of audiovisual services - Communication procedures

HSTP-MCTA Media coding toolbox for IPTV: Audio codecs

I n t e r n a t i o n a l

T e l e c o m m u n i c a t i o n

U n i o n

Summary This ITU-T Technical Paper addressesthe use of audio coding in services delivered over Internet Protocols (IP). It describes the use of MPEG-1 Layer II, AC-3, E-AC3, HE AAC v2 audio, Extended AMR WB (AMR WB+) audio, MPEG 2 AAC, MPEG-4 HE AAC, MPEG-4 HE AAC v2, MPEG Surround, MPEG-4 ALS, G719, G.722, G.722.1, G.722.1 Annex C, G.722.2, G.729.1, G.711.1 and G.718. In addition, this document describes the codecs’ use within anIPTV environment and the specified codecs for this use. This document adopts a “toolbox” approach for the general case of IPTV applications delivered directly over IP and MPEG2 -TS. This document is not a specification for the use of Audio Codecs in IPTV Services. Change Log This document contains Version 1of the ITU-T Technical Paper on “Media coding toolbox for IPTV: Audio codecs”approved at the ITU-T Study Group 16 meeting held in Geneva, 27 January - 6 February 2009. Editor: Herve Taddei Huawei Technologies China Tel: +49 162 2940 260 Email: herve.taddei@huawei.com

HSTP-MCTA (2009-02) i

Contents Page
1 2 3 4 5 6 7 SCOPE.................................................................................................................................................................. 1 REFERENCES..................................................................................................................................................... 1 DEFINITIONS ..................................................................................................................................................... 3 ABBREVIATIONS.............................................................................................................................................. 3 DOCUMENT STRUCTURE .............................................................................................................................. 4 AVAILABLE CODECS...................................................................................................................................... 4 AUDIO CODECS................................................................................................................................................. 5 7.1 AC-3 ............................................................................................................................................................. 5 7.1.1 Overview of AC-3.................................................................................................................................... 5 7.1.2 Transport of AC-3.................................................................................................................................... 7 7.1.3 EnhancedAC-3........................................................................................................................................ 7 7.1.4 Overview of Enhanced AC-3.................................................................................................................... 7 7.1.5 Transport of Enhanced AC-3................................................................................................................... 8 7.1.6 Storage of AC-3 and Enhanced AC-3bitstreams..................................................................................... 8 7.1.7 AC-3 and Enhanced AC-3 track definition .............................................................................................. 8 7.1.8 Sample definition for AC-3 and Enhanced AC-3 ..................................................................................... 9 7.1.9 Details of...
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