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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’.
Format encoding
Text
File extensions
mp1
Submitted by
Georgia Tech Research Institute / Georgia Tech Research Institute

Relationships

Is subtype of

Internal signatures

MPEG 1 Audio Layer I (protected)

Description
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
Provenance
Signature identified by Georgia Tech Research Institute

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)

Description
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
Provenance
Signature identified by Georgia Tech Research Institute

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)

Description
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
Provenance
Signature identified by Georgia Tech Research Institute

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)

Description
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
Provenance
Signature identified by Georgia Tech Research Institute

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

  • V51

    Release date
    15 July 2011

    • Added format

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

    • Added signature

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