分享
 
 
 

RFC3003 - The audio/mpeg Media Type

王朝other·作者佚名  2008-05-31
窄屏简体版  字體: |||超大  

Network Working Group M. Nilsson

Request for Comments: 3003 November 2000

Category: Standards Track

The audio/mpeg Media Type

Status of this Memo

This document specifies an Internet standards track protocol for the

Internet community, and requests discussion and suggestions for

improvements. Please refer to the current edition of the "Internet

Official Protocol Standards" (STD 1) for the standardization state

and status of this protocol. Distribution of this memo is unlimited.

Copyright Notice

Copyright (C) The Internet Society (2000). All Rights Reserved.

Abstract

The audio layers of the MPEG-1 and MPEG-2 standards are in frequent

use on the internet, but there is no uniform Multipurpose Internet

Mail Extension (MIME) type for these files. The intention of this

document is to define the media type audio/mpeg to refer to this kind

of contents.

The key Words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",

"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this

document are to be interpreted as described in RFC2119 [RFC2119].

1. MPEG audio

The audio compression defined as layer I, layer II and layer III in

the MPEG-1 [MPEG-1] and MPEG-2 [MPEG-2] standards is a popular method

of compressing audio with a low quality loss. The compressed audio

is split into several small data frames, each containing a frame

header and compressed audio data.

The mime type audio/mpeg defines a elementary byte stream containing

MPEG frames according to [MPEG-1] and [MPEG-2], possibly interspersed

with non MPEG data. Non MPEG data is data without MPEG

synchronization or in other ways not possible to decompress without

error.

Typically MPEG audio meta data is concatenated with the MPEG stream,

e.g., the meta data format ID3 puts a 128 byte data block in the end

of the stream while ID3v2 [ID3V2] prepends a data block of variable

size to the stream.

NOTE: MPEG audio was not designed as a file format but as a format

for transmitting audio streams. As sUCh, it does not have any well

defined way of including meta data along with audio information.

Some products embed meta data using zero amplitude frames or

disguised as transmission errors. Others embed the MPEG data in WAV

format.

NOTE: The audio/MPS mime type is in use in addition to the

audio/mpeg. The MPA [RFC1890] sub-type refers to MPEG audio when it

is segmented and send as a Realtime Transport Protocol (RTP) payload.

2. Registration Information

To: ietf-types@iana.org Subject: Registration of MIME media type

audio/mpeg

MIME media type name: audio

MIME suBType name: mpeg

Required parameters: none

Optional parameters: none

Encoding considerations:

For use over internet it is assumed that lower layers take care

of transmission errors, so audio/mpeg data MAY include MPEG

frames generated without the optional cyclic redundancy checks

(CRC) for improved audio quality.

The MPEG audio data is binary data, and must be encoded for

non-binary transport; the Base64 encoding is suitable for Email.

Note that the MPEG audio data does not compress easily using

lossless compression.

Security considerations:

MPEG is a tagged data format, and some tags are available for

private use. As such, arbitrary material could potentially

be transferred in the MPEG stream, including executable content.

Tagged data containing executable content SHOULD never be sent

and MUST not be executed if it is received.

NOTE

The requirement that such content not be executed on receipt

is especially important since situations exist where content

will be generated independently and therefore could contain

executable content that the sender is unaware of.

Audio/mpeg objects are not signed or encrypted internally.

External security mechanisms must be employed to ensure content

confidentiality

Interoperability considerations:

MPEG audio has proven to be widely interoperable across computer

platforms.

Published specification: see [MPEG-1] and [MPEG-2]

Applications which use this media type:

MPEG audio is device-, platform- and vendor-neutral and is

supported by a wide range of encoders and decoders (players).

Additional information:

Magic number(s): none

File extension(s): .mp1, .mp2, .mp3

Macintosh File Type Code(s): MPEG

Object Identifier(s) or OID(s): none

Person & email address to contact for further information:

The author of this document.

Intended usage: COMMON

Author/Change controller: Martin Nilsson (see section 5)

3. Security Considerations

Security considerations are discussed in the security considerations

clause of the MIME registration in section 2.

4. References

[ID3v2]

Martin Nilsson, "ID3 tag version 2.3.0".

<url:http://www.id3.org/id3v2.3.0.txt>

[MPEG-1]

ISO/IEC 11172-3:1993.

Coding of moving pictures and associated audio for digital storage

media at up to about 1,5 Mbit/s, Part 3: Audio.

Technical committee / subcommittee: JTC 1 / SC 29

[MPEG-2]

ISO/IEC 13818-3:1995

Generic coding of moving pictures and associated audio information,

Part 3: Audio.

Technical committee / subcommittee: JTC 1 / SC 29

and

ISO/IEC DIS 13818-3

Generic coding of moving pictures and associated audio information,

Part 3: Audio (Revision of ISO/IEC 13818-3:1995)

[RFC2119]

Bradner, S., "Key words for use in RFCs to Indicate Requirement

Levels", BCP 14, RFC2119, March 1997.

5. Author's Address

Martin Nilsson

Rydsvagen 246 C. 30

S-584 34 Linkoping

Sweden

EMail: nilsson@id3.org

6. Full Copyright Statement

Copyright (C) The Internet Society (2000). All Rights Reserved.

This document and translations of it may be copied and furnished to

others, and derivative works that comment on or otherwise eXPlain it

or assist in its implementation may be prepared, copied, published

and distributed, in whole or in part, without restriction of any

kind, provided that the above copyright notice and this paragraph are

included on all such copies and derivative works. However, this

document itself may not be modified in any way, such as by removing

the copyright notice or references to the Internet Society or other

Internet organizations, except as needed for the purpose of

developing Internet standards in which case the procedures for

copyrights defined in the Internet Standards process must be

followed, or as required to translate it into languages other than

English.

The limited permissions granted above are perpetual and will not be

revoked by the Internet Society or its successors or assigns.

This document and the information contained herein is provided on an

"AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING

TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING

BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION

HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF

MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

Acknowledgement

Funding for the RFCEditor function is currently provided by the

Internet Society.

 
 
 
免责声明:本文为网络用户发布,其观点仅代表作者个人观点,与本站无关,本站仅提供信息存储服务。文中陈述内容未经本站证实,其真实性、完整性、及时性本站不作任何保证或承诺,请读者仅作参考,并请自行核实相关内容。
2023年上半年GDP全球前十五强
 百态   2023-10-24
美众议院议长启动对拜登的弹劾调查
 百态   2023-09-13
上海、济南、武汉等多地出现不明坠落物
 探索   2023-09-06
印度或要将国名改为“巴拉特”
 百态   2023-09-06
男子为女友送行,买票不登机被捕
 百态   2023-08-20
手机地震预警功能怎么开?
 干货   2023-08-06
女子4年卖2套房花700多万做美容:不但没变美脸,面部还出现变形
 百态   2023-08-04
住户一楼被水淹 还冲来8头猪
 百态   2023-07-31
女子体内爬出大量瓜子状活虫
 百态   2023-07-25
地球连续35年收到神秘规律性信号,网友:不要回答!
 探索   2023-07-21
全球镓价格本周大涨27%
 探索   2023-07-09
钱都流向了那些不缺钱的人,苦都留给了能吃苦的人
 探索   2023-07-02
倩女手游刀客魅者强控制(强混乱强眩晕强睡眠)和对应控制抗性的关系
 百态   2020-08-20
美国5月9日最新疫情:美国确诊人数突破131万
 百态   2020-05-09
荷兰政府宣布将集体辞职
 干货   2020-04-30
倩女幽魂手游师徒任务情义春秋猜成语答案逍遥观:鹏程万里
 干货   2019-11-12
倩女幽魂手游师徒任务情义春秋猜成语答案神机营:射石饮羽
 干货   2019-11-12
倩女幽魂手游师徒任务情义春秋猜成语答案昆仑山:拔刀相助
 干货   2019-11-12
倩女幽魂手游师徒任务情义春秋猜成语答案天工阁:鬼斧神工
 干货   2019-11-12
倩女幽魂手游师徒任务情义春秋猜成语答案丝路古道:单枪匹马
 干货   2019-11-12
倩女幽魂手游师徒任务情义春秋猜成语答案镇郊荒野:与虎谋皮
 干货   2019-11-12
倩女幽魂手游师徒任务情义春秋猜成语答案镇郊荒野:李代桃僵
 干货   2019-11-12
倩女幽魂手游师徒任务情义春秋猜成语答案镇郊荒野:指鹿为马
 干货   2019-11-12
倩女幽魂手游师徒任务情义春秋猜成语答案金陵:小鸟依人
 干货   2019-11-12
倩女幽魂手游师徒任务情义春秋猜成语答案金陵:千金买邻
 干货   2019-11-12
 
推荐阅读
 
 
 
>>返回首頁<<
 
靜靜地坐在廢墟上,四周的荒凉一望無際,忽然覺得,淒涼也很美
© 2005- 王朝網路 版權所有