---
title: kAudioConverterPropertyBitDepthHint
framework: audiotoolbox
role: symbol
role_heading: Global Variable
path: audiotoolbox/kaudioconverterpropertybitdepthhint
---

# kAudioConverterPropertyBitDepthHint

A UInt32 value that designates the source bit depth to preserve.

## Declaration

```swift
var kAudioConverterPropertyBitDepthHint: AudioConverterPropertyID { get }
```

## Discussion

Discussion This is a hint used by some encoders, such as the Apple lossless encoder. The converter usually tries to preserve as many bits as possible. A lossless encoder does poorly if more bits are supplied than are desired in the output.

## See Also

### Constants

- [kAudioConverterPropertyMinimumInputBufferSize](audiotoolbox/kaudioconverterpropertyminimuminputbuffersize.md)
- [kAudioConverterPropertyMinimumOutputBufferSize](audiotoolbox/kaudioconverterpropertyminimumoutputbuffersize.md)
- [kAudioConverterPropertyMaximumInputBufferSize](audiotoolbox/kaudioconverterpropertymaximuminputbuffersize.md)
- [kAudioConverterPropertyMaximumInputPacketSize](audiotoolbox/kaudioconverterpropertymaximuminputpacketsize.md)
- [kAudioConverterPropertyMaximumOutputPacketSize](audiotoolbox/kaudioconverterpropertymaximumoutputpacketsize.md)
- [kAudioConverterPropertyCalculateInputBufferSize](audiotoolbox/kaudioconverterpropertycalculateinputbuffersize.md)
- [kAudioConverterPropertyCalculateOutputBufferSize](audiotoolbox/kaudioconverterpropertycalculateoutputbuffersize.md)
- [kAudioConverterPropertyInputCodecParameters](audiotoolbox/kaudioconverterpropertyinputcodecparameters.md)
- [kAudioConverterPropertyOutputCodecParameters](audiotoolbox/kaudioconverterpropertyoutputcodecparameters.md)
- [kAudioConverterSampleRateConverterAlgorithm](audiotoolbox/kaudioconvertersamplerateconverteralgorithm.md)
- [kAudioConverterSampleRateConverterComplexity](audiotoolbox/kaudioconvertersamplerateconvertercomplexity.md)
- [kAudioConverterSampleRateConverterQuality](audiotoolbox/kaudioconvertersamplerateconverterquality.md)
- [kAudioConverterSampleRateConverterInitialPhase](audiotoolbox/kaudioconvertersamplerateconverterinitialphase.md)
- [kAudioConverterCodecQuality](audiotoolbox/kaudioconvertercodecquality.md)
- [kAudioConverterPrimeMethod](audiotoolbox/kaudioconverterprimemethod.md)