# copyPCMData(fromRange:into:) Copies PCM audio data from the sample buffer into a pre-allocated `AudioBufferList`. ``` func copyPCMData(fromRange range: Range, into bufferList: UnsafeMutablePointer) throws ``` ## Parameters `range` Range of frames to copy. `bufferList` Pre-allocated `AudioBufferList`. ## Discussion The `AudioBufferList` must contain the same number of channels and its data buffers must be sized to hold the specified number of frames. > Throws: ``CMSampleBuffer.Error.sampleIndexOutOfRange`` if the range does not fit in the sample buffer or if > the bufferList does not have enough capacity. --- 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)