---
title: Sample description size
framework: quicktime-file-format
role: symbol
role_heading: Data field
path: quicktime-file-format/sound_sample_description_version_2/sample_description_size
---

# Sample description size

A 32-bit integer indicating the number of bytes in the sample description.

## See Also

### Data fields

- [Data format](quicktime-file-format/sound_sample_description_version_2/data_format.md)
- [Reserved](quicktime-file-format/sound_sample_description_version_2/reserved.md)
- [Data reference index](quicktime-file-format/sound_sample_description_version_2/data_reference_index.md)
- [Version](quicktime-file-format/sound_sample_description_version_2/version.md)
- [Revision level](quicktime-file-format/sound_sample_description_version_2/revision_level.md)
- [Vendor](quicktime-file-format/sound_sample_description_version_2/vendor.md)
- [always3](quicktime-file-format/sound_sample_description_version_2/always3.md)
- [always16](quicktime-file-format/sound_sample_description_version_2/always16.md)
- [alwaysMinus2](quicktime-file-format/sound_sample_description_version_2/alwaysminus2.md)
- [always0](quicktime-file-format/sound_sample_description_version_2/always0.md)
- [always65536](quicktime-file-format/sound_sample_description_version_2/always65536.md)
- [sizeOfStructOnly](quicktime-file-format/sound_sample_description_version_2/sizeofstructonly.md)
- [numAudioChannels](quicktime-file-format/sound_sample_description_version_2/numaudiochannels.md)
- [always7F000000](quicktime-file-format/sound_sample_description_version_2/always7f000000.md)
- [constBitsPerChannel](quicktime-file-format/sound_sample_description_version_2/constbitsperchannel.md)