MIMETypesCodecs: Difference between revisions
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=== Codecs Parameter === | === Codecs Parameter === | ||
[[ | [[http://www.rfc-editor.org/rfc/rfc4281.txt | Typically]], MIME types of media encapsulation formats use the optional "codecs" parameter to specify which codes are being used in a particular file. | ||
Codecs encapsulated in Ogg require a text identifier at the beginning of the first header page to identify the encapsulated codecs. The following table contains the identifiers for existing Xiph codecs and the codecs parameter names used for */ogg MIME types: | Codecs encapsulated in Ogg require a text identifier at the beginning of the first header page to identify the encapsulated codecs. The following table contains the identifiers for existing Xiph codecs and the codecs parameter names used for */ogg MIME types: | ||
Revision as of 20:26, 5 June 2008
Specification of MIME Types and of codecs parameters
MIME Types
The following MIME types are now officially registered with IANA (well, almost, see [[1]]):
- application/ogg - for complex, multitrack, multiplexed files encapsulated in Ogg
- requires a Skeleton logical bitstream
- video/ogg - for video encapsulated in Ogg
- recommends a Skeleton logical bitstrem
- audio/ogg - for audio encapsulated in Ogg
- recommends a Skeleton logical bitstrem
Other MIME types are still in the process.
Codecs Parameter
[| Typically], MIME types of media encapsulation formats use the optional "codecs" parameter to specify which codes are being used in a particular file.
Codecs encapsulated in Ogg require a text identifier at the beginning of the first header page to identify the encapsulated codecs. The following table contains the identifiers for existing Xiph codecs and the codecs parameter names used for */ogg MIME types:
| Codecs Parameter Name | Codec Identifier (decimal) | Codec Identifier (hex) | Codec Identifier (octal) | Version Field (if available) |
|---|---|---|---|---|
| dirac | char[0,5]: 'BBCD\0' | '0x42 0x42 0x43 0x44 00' | '0102 0102 0103 0104 0000' | ?? |
| flac | char[0,5]: '\177FLAC' | '0x7F 0x46 0x4C 0x41 0x43' | '0177 0106 0114 0101 0103' | char[5,1]: binary major versin number,
char[6,1]: binary minor version number of mapping |
| theora | char[0,7]: '\x80theora' | '0x80 0x74 0x68 0x65 0x6f 0x72 0x61' | '0180 0164 0150 0145 0157 0162 0141' |
Codec Identifier | Codecs Parameter
-----------------------------------------------------------
char[7]: '\x80theora' | theora
char[7]: '\x01vorbis' | vorbis
char[8]: 'Speex ' | speex
char[8]: 'OggMIDI\0' | midi
char[8]: 'CMML\0\0\0\0' | cmml
char[8]: '\211PNG\r\n\032\n' | png
char[8]: '\212MNG\r\n\032\n' | mng
char[8]: '\213JNG\r\n\032\n' | jng
char[8]: 'CELT ' | celt
char[8]: 'PCM ' | pcm
char[9]: '\x80kate\0\0\0\0' | kate
char[9]: 'YUV4MPEG2' | yuv4mpeg