Audio Interchange File Format

• Extensions: aif, aiff
• Company: Apple
• Official Specification: http://multimedia.cx/mirror/AudioIFF1_2_1.htm
• MIME Types:
  • aif, aiff: audio/aiff, audio/x-aiff, or audio/x-pn-aiff
• Samples: http://www-mmsp.ece.mcgill.ca/Documents/AudioFormats/AIFF/Samples.html

AIFF files exclusively store audio data. They serve as somewhat of an Apple analog of the Microsoft Wave format.

Comprehensive AIFF tag listing: http://hul.harvard.edu/jhove/aiff-hul.html

Sample Rate

The sample rate is stored as an extended precision float (80 bits, 10 bytes)

SampleRate Layout

Type	Size
SignBit	1 bit.
Exponent	15 bits.
Mantissa	64 bits.

Example Sample Rates

Value	Bitset
8000	0x400BFA00000000000000
44100	0x400EAC44000000000000
48000	0x400EBB80000000000000
88200	0x400FAC44000000000000
96000	0x400FBB80000000000000
192000	0x4010BB80000000000000