# AudioQueueOfflineRender(_:_:_:_:) Exports audio to a buffer, instead of to a device, using a playback audio queue. ``` func AudioQueueOfflineRender(_ inAQ: AudioQueueRef, _ inTimestamp: UnsafePointer, _ ioBuffer: AudioQueueBufferRef, _ inNumberFrames: UInt32) -> OSStatus ``` ## Parameters `inAQ` The playback audio queue. `inTimestamp` The time corresponding to the beginning of the current audio queue buffer. This function uses the `mSampleTime` field of the data structure. `ioBuffer` On input, a buffer you supply to hold rendered audio data. On output, the rendered audio data, which you can then write to a file. `inNumberFrames` The number of frames of audio to render. ## Return Value A result code. See Result Codes. ## Discussion When you change a playback audio queue’s rendering mode to offline, using the [`AudioQueueSetOfflineRenderFormat(_:_:_:)`](/documentation/AudioToolbox/AudioQueueSetOfflineRenderFormat(_:_:_:)) function, you gain access to the rendered audio. You can then write the audio to a file, rather than have it play to external hardware such as a loudspeaker. ## See Also [`AudioQueueStart(_:_:)`](/documentation/AudioToolbox/AudioQueueStart(_:_:)) Begins playing or recording audio. --- 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)