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(See the Legal Provisions document at https://trustee.ietf.org/license-info for more information.) -- The document date (October 1998) is 9324 days in the past. Is this intentional? Checking references for intended status: Proposed Standard ---------------------------------------------------------------------------- (See RFCs 3967 and 4897 for information about using normative references to lower-maturity documents in RFCs) -- Possible downref: Non-RFC (?) normative reference: ref. 'MPEG-1' -- Possible downref: Non-RFC (?) normative reference: ref. 'MPEG-2' Summary: 10 errors (**), 0 flaws (~~), 5 warnings (==), 4 comments (--). Run idnits with the --verbose option for more detailed information about the items above. -------------------------------------------------------------------------------- 1 Internet Engineering Task Force M. Nilsson 2 Document: draft-nilsson-audio-mpeg-00.txt 3 Expires 6th October 1998 5 The audio/mpeg Media Type 7 Status of this Memo 9 This document is an Internet-Draft. Internet-Drafts are working 10 documents of the Internet Engineering Task Force (IETF), its 11 areas, and its working groups. Note that other groups may also 12 distribute working documents as Internet-Drafts. 14 Internet-Drafts are draft documents valid for a maximum of six 15 months and may be updated, replaced, or obsoleted by other 16 documents at any time. It is inappropriate to use Internet- 17 Drafts as reference material or to cite them other than as 18 "work in progress." 20 To view the entire list of current Internet-Drafts, please check 21 the "1id-abstracts.txt" listing contained in the Internet-Drafts 22 Shadow Directories on ftp.is.co.za (Africa), ftp.nordu.net 23 (Northern Europe), ftp.nis.garr.it (Southern Europe), munnari.oz.au 24 (Pacific Rim), ftp.ietf.org (US East Coast), or ftp.isi.edu 25 (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. The frame header is easy to find even if 45 it is surrounded with non-MPEG data. 47 To allow the use of MPEG audio compression over connections with 48 lower bandwith, a non-ISO-approved standard called MPEG 2.5, has been 49 invented as well. 51 2. Registration Information 53 To: ietf-types@iana.org 54 Subject: Registration of MIME media type audio/mpeg 56 MIME media type name: audio 58 MIME subtype name: mpeg 60 Required parameters: none 62 Optional parameters: none 64 Encoding considerations: 66 For use over internet it is assumed that lower layers take care of 67 transmission errors, so the use of cyclic redundancy checks (CRC) 68 in the MPEG frames is not needed. 70 For easier recognition and to provide additional information about 71 the file's content, extra information may be concatenated to the 72 file. As long as the MPEG frames are unmodified and no 73 concatenated data is recognized as an MPEG frame, this is not a 74 problem for MPEG audio decoders. 76 Security considerations: 78 The concatenated data might contain executable code. This 79 executable code can only be executed by a program that looks for 80 it and is not executed by an MPEG audio decoder when it attempts 81 to play the file. It's simply ignored. 83 Interoperability considerations: 85 MPEG audio has proven to be widely interoperable across computer 86 platforms. 88 Published specification: see [MPEG-1] and [MPEG-2] 90 Applications which use this media type: 92 MPEG audio is device-, platform- and vendor-neutral and is 93 supported by a wide range of encoders and decoders (players). 95 Additional information: 97 Magic number(s): none 98 File extension(s): .mp1, .mp2, .mp3 99 Macintosh File Type Code(s): MPEG 100 Object Identifier(s) or OID(s): none 102 Person & email address to contact for further information: 104 The author of this draft. 106 Intended usage: COMMON 108 Author/Change controller: 110 3. References 112 [MPEG-1] 113 ISO/IEC 11172-3:1993. 114 Coding of moving pictures and associated audio for digital storage 115 media at up to about 1,5 Mbit/s, Part 3: Audio. 116 Technical committee / subcommittee: JTC 1 / SC 29 118 [MPEG-2] 119 ISO/IEC 13818-3:1995 120 Generic coding of moving pictures and associated audio information, 121 Part 3: Audio. 122 Technical committee / subcommittee: JTC 1 / SC 29 124 and 126 ISO/IEC DIS 13818-3 127 Generic coding of moving pictures and associated audio information, 128 Part 3: Audio (Revision of ISO/IEC 13818-3:1995) 130 4. Full Copyright Statement 132 Copyright (C) The Internet Society (1998). All Rights Reserved. 134 This document and translations of it may be copied and furnished to 135 others, and derivative works that comment on or otherwise explain it 136 or assist in its implmentation may be prepared, copied, published and 137 distributed, in whole or in part, without restriction of any kind, 138 provided that the above copyright notice and this paragraph are 139 included on all such copies and derivative works. However, this 140 document itself may not be modified in any way, such as by removing 141 the copyright notice or references to the Internet Society or other 142 Internet organizations, except as needed for the purpose of 143 developing Internet standards in which case the procedures for 144 copyrights defined in the Internet Standards process must be 145 followed, or as required to translate it into languages other than 146 English. 148 The limited permissions granted above are perpetual and will not be 149 revoked by the Internet Society or its successors or assigns. 151 This document and the information contained herein is provided on an 152 "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING 153 TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING 154 BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION 155 HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF 156 MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE." 158 5. Authors' Addresses 160 Martin Nilsson 161 Rydsv�gen 246 C. 30 162 S-584 34 Link�ping 163 Sweden 165 Email: martin.nilsson@bigfoot.com