Is it possible to set preferred sample buffer size for AVCaptureOutput?

Question

Say we have an AVCaptureAudioDataOutput object that has been set up with an AVCaptureSession to get data samples from the device's microphone.

captureOutput(_:didOutput:from:) in AVCaptureAudioDataOutputSampleBufferDelegate always gets called with 2048 bytes of samples. Is it possible to set a preferred sample buffer size?

A basic example:

let output = AVCaptureAudioDataOutput()
output.setSampleBufferDelegate(delegate, queue)
// Add output to AVCaptureSession and start the capture session once everything is set up
...

// In the delegate
public func captureOutput(_ output: AVCaptureOutput, 
                          didOutput sampleBuffer: CMSampleBuffer, 
                          from connection: AVCaptureConnection) {
    // sampleBuffer is 2048 bytes, but I want less
    let blockBuffer = CMSampleBufferGetDataBuffer(sampleBuffer)
    print(CMBlockBufferGetDataLength(blockBuffer!)) // 2048
    ...
}