<?xml version="1.0" encoding="utf-8"?>
<PRONOM-Report xmlns="http://pronom.nationalarchives.gov.uk">
  <report_format_detail>
    <FileFormat>
      <FormatID>195</FormatID>
      <FormatName>Audio Interchange File Format (compressed)</FormatName>
      <FormatVersion>
      </FormatVersion>
      <FormatAliases>
      </FormatAliases>
      <FormatFamilies>
      </FormatFamilies>
      <FormatTypes>Audio</FormatTypes>
      <FormatDisclosure>
      </FormatDisclosure>
      <FormatDescription>The Audio Interchange File Format, Compressed (AIFF-C) provides a standard for storing uncompressed or compressed sampled sounds.  The format can store monaural or multichannel sampled sounds in a range of sample rates and sample widths.  The format is extensible to handle new compression types and application-specific data.</FormatDescription>
      <BinaryFileFormat>Text</BinaryFileFormat>
      <ByteOrders>
      </ByteOrders>
      <ReleaseDate>26 Aug 1991</ReleaseDate>
      <WithdrawnDate>
      </WithdrawnDate>
      <ProvenanceSourceID>180</ProvenanceSourceID>
      <ProvenanceName>The National Archives and Records Administration / The National Archives and Records Administration</ProvenanceName>
      <ProvenanceSourceDate>02 Aug 2005</ProvenanceSourceDate>
      <ProvenanceDescription>Further information about this file format can be obtained at 
http://www-mmsp.ece.mcgill.ca/documents/audioformats/aiff/docs/aiff-c.9.26.91.pdf</ProvenanceDescription>
      <LastUpdatedDate>28 Aug 2012</LastUpdatedDate>
      <FormatNote>
      </FormatNote>
      <FormatRisk>
      </FormatRisk>
      <TechnicalEnvironment>
      </TechnicalEnvironment>
      <FileFormatIdentifier>
        <Identifier>audio/x-aiff</Identifier>
        <IdentifierType>MIME</IdentifierType>
      </FileFormatIdentifier>
      <FileFormatIdentifier>
        <Identifier>x-fmt/136</Identifier>
        <IdentifierType>PUID</IdentifierType>
      </FileFormatIdentifier>
      <ExternalSignature>
        <ExternalSignatureID>189</ExternalSignatureID>
        <Signature>aifc</Signature>
        <SignatureType>File extension</SignatureType>
      </ExternalSignature>
      <InternalSignature>
        <SignatureID>321</SignatureID>
        <SignatureName>Audio Interchange File Format (Compressed)</SignatureName>
        <SignatureNote>Starts like most IFF files (FORM) followed by four bytes that tell how many more bytes follow in the file followed by AIFC.</SignatureNote>
        <ByteSequence>
          <ByteSequenceID>421</ByteSequenceID>
          <PositionType>Absolute from BOF</PositionType>
          <Offset>0</Offset>
          <MaxOffset>
          </MaxOffset>
          <IndirectOffsetLocation>
          </IndirectOffsetLocation>
          <IndirectOffsetLength>
          </IndirectOffsetLength>
          <Endianness>Big-endian</Endianness>
          <ByteSequenceValue>464F524D{4}41494643</ByteSequenceValue>
        </ByteSequence>
      </InternalSignature>
      <RelatedFormat>
        <RelationshipType>Has priority over</RelationshipType>
        <RelatedFormatID>221</RelatedFormatID>
        <RelatedFormatName>Interchange File</RelatedFormatName>
        <RelatedFormatVersion>
        </RelatedFormatVersion>
      </RelatedFormat>
    </FileFormat>
    <SearchCriteria>Criteria</SearchCriteria>
  </report_format_detail>
</PRONOM-Report>
