# newTimedMetadataSampleBufferAndResetAnalyzer() Creates a sample buffer containing a spatial audio timed metadata sample computed from all analyzed audio buffers, and resets the analyzer to its initial state. ``` func newTimedMetadataSampleBufferAndResetAnalyzer() -> Unmanaged? ``` ## Return Value a `CMSampleBufferRef` containing the spatial audio timed metadata sample, or `NULL` if no value can be computed. ## Discussion Call this method after you pass the last audio sample buffer of your recording to [`analyzeAudioSample(_:)`](/documentation/AVFoundation/AVCaptureSpatialAudioMetadataSampleGenerator/analyzeAudioSample(_:)). Then pass the returned `CMSampleBufferRef` directly to your [`AVAssetWriterInput`](/documentation/AVFoundation/AVAssetWriterInput) to add the sample to your recording’s audio timed metadata track. Note that [`AVAssetWriter`](/documentation/AVFoundation/AVAssetWriter) expects one and only one spatial audio metadata sample buffer to be present in the timed metadata track. > Note: Calling this method also resets the analyzer, making it ready for another run of audio sample buffers. Thus one generator can be re-used for multiple recordings. --- 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)