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# Global Codec Properties

These read-only properties disclose the capabilities of the codec and remain the same for all instances of the codec.

## Discussion

These properties are used with the [`AudioCodecGetProperty(_:_:_:_:)`](/documentation/AudioToolbox/AudioCodecGetProperty(_:_:_:_:)) function.

The values of these properties are independent of the codec’s internal state and cannot be changed. They can be read at any time the codec is open.

## Topics

### Constants

[`var kAudioCodecPropertyFormatCFString: AudioCodecPropertyID`](/documentation/AudioToolbox/kAudioCodecPropertyFormatCFString)

[`var kAudioCodecPropertyManufacturerCFString: AudioCodecPropertyID`](/documentation/AudioToolbox/kAudioCodecPropertyManufacturerCFString)

[`var kAudioCodecPropertyNameCFString: AudioCodecPropertyID`](/documentation/AudioToolbox/kAudioCodecPropertyNameCFString)


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