---
title: siSlopeAndIntercept atom
framework: quicktime-file-format
role: symbol
role_heading: Atom
path: quicktime-file-format/sislopeandintercept_atom
---

# siSlopeAndIntercept atom

An atom that contains parameters relevant to a decompressor component.

## Overview

Overview note: The siSlopeAndIntercept atom is deprecated in the QuickTime file format. The information that follows documents existing content containing this atom and should not be used for new development. The siSlopeAndIntercept atom contains slope, intercept, minClip, and maxClip parameters relevant to a decompressor component. At runtime, the contents of the type siSlopeAndIntercept and siDecompressorSettings atoms are provided to the decompressor component through the standard SetInfo mechanism of the Sound Manager. struct SoundSlopeAndInterceptRecord {     Float64                 slope;     Float64                 intercept;     Float64                 minClip;     Float64                 maxClip; }; typedef struct SoundSlopeAndInterceptRecord SoundSlopeAndInterceptRecord;

## Topics

### Data fields

- [Slope](quicktime-file-format/sislopeandintercept_atom/slope.md)
- [Intercept](quicktime-file-format/sislopeandintercept_atom/intercept.md)
- [minClip](quicktime-file-format/sislopeandintercept_atom/minclip.md)
- [maxClip](quicktime-file-format/sislopeandintercept_atom/maxclip.md)

## See Also

### Extending sound sample descriptions

- [siDecompressionParam atom ('wave')](quicktime-file-format/sidecompressionparam_atom.md)
- [Format atom ('frma')](quicktime-file-format/format_atom.md)
- [Terminator atom ('0x00000000')](quicktime-file-format/terminator_atom.md)
- [MPEG-4 elementary stream descriptor atom  ('esds')](quicktime-file-format/mpeg-4_elementary_sound_stream_descriptor_atom.md)
- [Audio channel layout atom ('chan')](quicktime-file-format/audio_channel_layout_atom.md)
- [Subtitle follows track reference atom ('folw')](quicktime-file-format/subtitle_follows_track_reference_atom.md)