Contents

CMSampleBufferCopyPCMDataIntoAudioBufferList(_:at:frameCount:into:)

Copies PCM audio data from a sample buffer into an audio buffer list.

Declaration

func CMSampleBufferCopyPCMDataIntoAudioBufferList(_ sbuf: CMSampleBuffer, at frameOffset: Int32, frameCount numFrames: Int32, into bufferList: UnsafeMutablePointer<AudioBufferList>) -> OSStatus

Parameters

  • sbuf:

    The sample buffer containing the PCM audio data to be copied.

  • frameOffset:

    The frame offset number from which to begin the copy.

  • numFrames:

    The total number of frames to copy.

  • bufferList:

    The audio buffer list to populate.

Discussion

The AudioBufferList must contain the same number of channels and its data buffers must be sized to hold the specified number of frames.

This API is specific to audio format sample buffers, and will return kCMSampleBufferError_InvalidMediaTypeForOperation if called with a non-audio sample buffer. It will return an error if the sample buffer doesn’t contain PCM audio data or if its data buffer isn’t ready.

See Also

Modifying Sample Buffers