# convert(_:at:) Converts an audio buffer. ``` final func convert(_ buffer: AVAudioBuffer, at audioTime: AVAudioTime?) throws -> [AnalyzerInput] ``` ## Parameters `buffer` An audio buffer to convert. Do not reuse or modify this buffer; it may be retained across calls. `audioTime` The time-code of the start of the audio buffer. If `nil`, the audio buffer is assumed to start immediately after the previous buffer (or at time-code zero if there is no previous buffer). ## Return Value An array of `AnalyzerInput` objects containing converted audio corresponding to some or all of the audio buffer. ## Discussion This method does not necessarily convert the entire audio buffer. Some audio data may be held over and integrated into the conversion of a later audio buffer for correctness or efficiency. Call [`flush()`](/documentation/Speech/AnalyzerInputConverter/flush()) to convert any remaining held-over audio and add it to the analyzer’s input sequence before finishing the sequence. --- 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)