# AudioConverterConvertComplexBuffer(_:_:_:_:) Converts audio data from one linear PCM format to another, where both use the same sample rate. ``` func AudioConverterConvertComplexBuffer(_ inAudioConverter: AudioConverterRef, _ inNumberPCMFrames: UInt32, _ inInputData: UnsafePointer, _ outOutputData: UnsafeMutablePointer) -> OSStatus ``` ## Parameters `inAudioConverter` The audio converter to use for the format conversion. `inNumberPCMFrames` The number of linear PCM frames to convert. `inInputData` The source audio buffer list. `outOutputData` The destination audio buffer list. ## Return Value A result code. ## Discussion This function is appropriate for linear PCM-to-linear PCM audio data format conversion where there is no sample rate conversion. > Important: > This function fails for conversions where there is a variation between the input and output data buffer sizes. This includes sample rate conversions and conversions involving most compressed formats. In these cases, instead use the ``doc://com.apple.audiotoolbox/documentation/AudioToolbox/AudioConverterFillComplexBuffer(_:_:_:_:_:_:)`` function. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)