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Run idnits with the --verbose option for more detailed information about the items above. -------------------------------------------------------------------------------- 1 Internet Engineering Task Force M. Nilsson 2 INTERNET DRAFT 6th November 1998 3 Document: draft-nilsson-audio-mpeg-01.txt 4 Expires 6th May 1999 6 The audio/mpeg Media Type 8 Status of this Memo 10 This document is an Internet-Draft. Internet-Drafts are working 11 documents of the Internet Engineering Task Force (IETF), its 12 areas, and its working groups. Note that other groups may also 13 distribute working documents as Internet-Drafts. 15 Internet-Drafts are draft documents valid for a maximum of six 16 months and may be updated, replaced, or obsoleted by other 17 documents at any time. It is inappropriate to use Internet- 18 Drafts as reference material or to cite them other than as 19 "work in progress." 21 To view the entire list of current Internet-Drafts, please check 22 the "1id-abstracts.txt" listing contained in the Internet-Drafts 23 Shadow Directories on ftp.is.co.za (Africa), ftp.nordu.net 24 (Europe), munnari.oz.au (Pacific Rim), ds.internic.net (US East 25 Coast), or ftp.isi.edu (US West Coast). 27 This memo provides information for the Internet community. This 28 memo does not specify an Internet standard of any kind. 29 Distribution of this memo is unlimited. 31 Abstract 33 The audio layers of the MPEG-1 and MPEG-2 standards are in frequent 34 use on the internet, but there is no uniform MIME type for these 35 files. The intention of this draft is to standardize the use of 36 audio/mpeg as its media type. 38 1. MPEG audio 40 The audio compression defined as layer I, layer II and layer III in 41 the MPEG-1 [MPEG-1] and MPEG-2 [MPEG-2] standards is a popular method 42 of compressing audio with a low quality loss. The compressed audio is 43 split into several small data frames, each containing a frame header 44 and compressed audio data. 46 The mime type audio/mpeg defines a elementary byte stream containing 47 MPEG frames according to [MPEG-1] and [MPEG-2], possibly interspersed 48 with non MPEG data. Non MPEG data is data without MPEG 49 synchronisation or is not possible to decompress without error. 51 x 52 Internet DRAFT The audio/mpeg Media Type November 1998 54 2. Registration Information 56 To: ietf-types@iana.org 57 Subject: Registration of MIME media type audio/mpeg 59 MIME media type name: audio 61 MIME subtype name: mpeg 63 Required parameters: none 65 Optional parameters: none 67 Encoding considerations: 69 For use over internet it is assumed that lower layers take care 70 of transmission errors, so audio/mpeg data MAY include MPEG 71 frames generated without the optional cyclic redundancy checks 72 (CRC) for improved audio quality. Transmisson must be 8-bit 73 clean. 75 Security considerations: 77 Data concatenated with the MPEG stream might contain executable 78 code. This executable code can only be executed by a program that 79 looks for it and is not executed by an MPEG audio decoder when it 80 attempts to play the file. It's simply ignored. 82 Interoperability considerations: 84 MPEG audio has proven to be widely interoperable across computer 85 platforms. 87 Published specification: see [MPEG-1] and [MPEG-2] 89 Applications which use this media type: 91 MPEG audio is device-, platform- and vendor-neutral and is 92 supported by a wide range of encoders and decoders (players). 94 Additional information: 96 Magic number(s): none 97 File extension(s): .mp1, .mp2, .mp3 98 Macintosh File Type Code(s): MPEG 99 Object Identifier(s) or OID(s): none 101 Person & email address to contact for further information: 103 The author of this draft. 105 x 106 Internet DRAFT The audio/mpeg Media Type November 1998 108 Intended usage: COMMON 110 Author/Change controller: 112 3. References 114 [MPEG-1] 115 ISO/IEC 11172-3:1993. 116 Coding of moving pictures and associated audio for digital storage 117 media at up to about 1,5 Mbit/s, Part 3: Audio. 118 Technical committee / subcommittee: JTC 1 / SC 29 120 [MPEG-2] 121 ISO/IEC 13818-3:1995 122 Generic coding of moving pictures and associated audio information, 123 Part 3: Audio. 124 Technical committee / subcommittee: JTC 1 / SC 29 126 and 128 ISO/IEC DIS 13818-3 129 Generic coding of moving pictures and associated audio information, 130 Part 3: Audio (Revision of ISO/IEC 13818-3:1995) 132 4. Full Copyright Statement 134 Copyright (C) The Internet Society (1998). All Rights Reserved. 136 This document and translations of it may be copied and furnished to 137 others, and derivative works that comment on or otherwise explain it 138 or assist in its implmentation may be prepared, copied, published and 139 distributed, in whole or in part, without restriction of any kind, 140 provided that the above copyright notice and this paragraph are 141 included on all such copies and derivative works. However, this 142 document itself may not be modified in any way, such as by removing 143 the copyright notice or references to the Internet Society or other 144 Internet organizations, except as needed for the purpose of 145 developing Internet standards in which case the procedures for 146 copyrights defined in the Internet Standards process must be 147 followed, or as required to translate it into languages other than 148 English. 150 The limited permissions granted above are perpetual and will not be 151 revoked by the Internet Society or its successors or assigns. 153 This document and the information contained herein is provided on an 154 "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING 155 TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING 156 BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION 157 HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF 158 MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE." 160 x 161 Internet DRAFT The audio/mpeg Media Type November 1998 163 5. Authors' Addresses 165 Martin Nilsson 166 Rydsv�gen 246 C. 30 167 S-584 34 Link�ping 168 Sweden 170 Email: nilsson@id3.org 172 x