---
title: "Sound sample description version 0 ('stsd')"
framework: quicktime-file-format
role: symbol
role_heading: Atom
path: quicktime-file-format/sound_sample_description_version_0
---

# Sound sample description version 0 ('stsd')

A sound sample description that supports only uncompressed audio in raw or twos-complement format.

## Overview

Overview There are currently three versions of the sound sample description, versions 0, 1 and 2. Version 0 supports only uncompressed audio in raw ('raw ') or twos-complement ('twos') format, although these are sometimes incorrectly specified as either 'NONE' or 0x00000000. Version 0 of the sound description format assumes uncompressed audio in 'raw ' or 'twos' format, 1 or 2 channels, 8 or 16 bits per sample, and a compression ID of 0.

## Topics

### Data fields

- [Sample description size](quicktime-file-format/sound_sample_description_version_0/sample_description_size.md)
- [Data format](quicktime-file-format/sound_sample_description_version_0/data_format.md)
- [Reserved](quicktime-file-format/sound_sample_description_version_0/reserved.md)
- [Data reference index](quicktime-file-format/sound_sample_description_version_0/data_reference_index.md)
- [Version](quicktime-file-format/sound_sample_description_version_0/version.md)
- [Revision level](quicktime-file-format/sound_sample_description_version_0/revision_level.md)
- [Vendor](quicktime-file-format/sound_sample_description_version_0/vendor.md)
- [Number of channels](quicktime-file-format/sound_sample_description_version_0/number_of_channels.md)
- [Sample size](quicktime-file-format/sound_sample_description_version_0/sample_size.md)
- [Compression ID](quicktime-file-format/sound_sample_description_version_0/compression_id.md)
- [Packet size](quicktime-file-format/sound_sample_description_version_0/packet_size.md)
- [Sample rate](quicktime-file-format/sound_sample_description_version_0/sample_rate.md)

## See Also

### Using sample descriptions

- [Sound sample description version 1 ('stsd')](quicktime-file-format/sound_sample_description_version_1.md)
- [Sound sample description version 2 ('stsd')](quicktime-file-format/sound_sample_description_version_2.md)