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Disclaimer: The information on this page is for reference only. The information on this page does not constitute an official part of the sound file specification, and should not be used in the design of software systems. All the information on this page is subject to change without notice.
Audio file structures
The following figure shows an overview of the sound data structures that follow the ISO standard for all the official audio files.
Sound data structure overview
Each of the following sections describes the data structures used to store different parts of a sound file. Note that the ISO standard defines these data structures for all official sound files.
Sound file header
The header is the first structure in the sound file. It contains information about the length of the sound file and its bitrate. The header is used to determine the range of values that may be encoded in the file.
The following list contains the bytes of the sound file header in a hexadecimal format. The first two bytes are reserved, and the byte order is little-endian.
Bit
Byte
Description
0
1
2
4
- 2
3
- 3
- 1
- 5
- 4
- 0
5
- 6
6
- 7
7
- 8
8
- 9
9
- 10
10
- 11
11
- 12
12
- 13
13
- 14
14
- 15
15
- 16
16
- 17
17
- 18
18
- 19
19
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