# analyzeSequence(_:) Analyzes an input sequence, returning when the sequence terminates. ``` final func analyzeSequence(_ inputSequence: InputSequence) async throws -> CMTime? where InputSequence : Sendable, InputSequence : AsyncSequence, InputSequence.Element == AnalyzerInput ``` ## Parameters `inputSequence` An input sequence to analyze. ## Return Value The time-code of the last audio sample that was consumed from this or an earlier input sequence, or `nil` if no audio sample has been consumed. You may use this value for the parameter of [`finalizeAndFinish(through:)`](/documentation/Speech/SpeechAnalyzer/finalizeAndFinish(through:)) (or other methods). ## Discussion When this method returns, the last audio consumed from the input sequence may still be undergoing analysis. To wait for the analysis to complete, call another method such as [`finalize(through:)`](/documentation/Speech/SpeechAnalyzer/finalize(through:)) and await its return. If you cancel the task executing this method, most input sequences will terminate early, causing this method to return early. The method returns the time-code of the last audio sample that was consumed and does not throw `CancellationError`. --- 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)