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Format

MPEG 1/2 Audio Layer I

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Summary

Name
MPEG 1/2 Audio Layer I
Identifiers
  • MIME: audio/mpeg
  • PUID: fmt/347
Format type
Audio
Description
This is an outline record only, and requires further details, research or authentication to provide information that will enable users to further understand the format and to assess digital preservation risks associated with it if appropriate. If you are able to help by supplying any additional information concerning this entry, please return to the main PRONOM page and select ‘Add an Entry’.
File extensions
mp1
Source
Georgia Tech Research Institute / Georgia Tech Research Institute

Relationships

Is subtype of

Internal signatures

MPEG 1 Audio Layer I (protected)

Note
You have to check for two or more frames in a row to be sure you are dealing with an mpeg file. Frame header: MPEG-1, layer I, protected (FFF6h); Bitrate index Sampling Frequency, padding bit (1 byte), Minimum value 10h, maximum value Ebh; Minimum length of frame-3 to maximum length of frame -3; next frame header (FFF6h) repeat

Byte sequences

Min Frag Length
Absolute from BOF
Offset
0
Max offset
None
Byte Sequence
FFF6[10:EB]{29-769}FFF6[10:EB]{29-769}FFF6[10:EB]{29-769}FFF6[10:EB]{29-769}
Endianness
None

MPEG 1 Audio Layer I (unprotected)

Note
You have to check for two or more frames in a row to be sure you are dealing with an mpeg file. Frame header: MPEG-1, layer I, unprotected (FFF7h); Bitrate index Sampling Frequency, padding bit (1 byte), Minimum value 10h, maximum value EBh; Minimum length of frame-3 to maximum length of frame -3; next frame header (FFF7h) repeat

Byte sequences

Min Frag Length
Absolute from BOF
Offset
0
Max offset
None
Byte Sequence
FFF7[10:EB]{29-769}FFF7[10:EB]{29-769}FFF7[10:EB]{29-769}FFF7[10:EB]{29-769}
Endianness
None

MPEG 2 Audio Layer I (protected)

Note
You have to check for two or more frames in a row to be sure you are dealing with an mpeg file. Frame header: MPEG-2, layer I, protected (FFFEh); Bitrate index Sampling Frequency, padding bit (1 byte), Minimum value 10h, maximum value Ebh; Minimum length of frame-3 to maximum length of frame -3; next frame header (FFFEh) repeat

Byte sequences

Min Frag Length
Absolute from BOF
Offset
0
Max offset
None
Byte Sequence
FFFE[10:EB]{29-769}FFFE[10:EB]{29-769}FFFE[10:EB]{29-769}FFFE[10:EB]{29-769}
Endianness
None

MPEG 2 Audio Layer I (unprotected)

Note
You have to check for two or more frames in a row to be sure you are dealing with an mpeg file. Frame header: MPEG-2, layer I, unprotected (FFFFh); Bitrate index Sampling Frequency, padding bit (1 byte), Minimum value 10h, maximum value EBh; Minimum length of frame-3 to maximum length of frame -3; next frame header (FFFFh) repeat

Byte sequences

Min Frag Length
Absolute from BOF
Offset
0
Max offset
None
Byte Sequence
FFFF[10:EB]{29-769}FFFF[10:EB]{29-769}FFFF[10:EB]{29-769}FFFF[10:EB]{29-769}
Endianness
None

Changelog

  • Added in V51

    Release date
    15 July 2011

    MPEG 1/2 Audio Layer I: Signatures submitted by Georgia Tech Research Institute, USA.

    MPEG 1/2 Audio Layer I: Outline entry added. Submission from Georgia Tech Research Institute, USA.