"Size must be a power of 2" on iPhone 11 Pro

[Bcow7]

There's an assert failure "Size must be a power of 2" when instantiating the FFT on iPhone 11 Pro. I can replicate it with iPhone 11 Pro simulator.

Any idea of what is going wrong on this new device? Is it because of new CPU?

[jcutting7]

Yep - I have the same issue. It is because the number of samples returned by the microphone is only around ~940 or 941.

One thing I just tried was to pass 1024 as a fixed size to the initializer, rather than the size of my sample, i.e.
TempiFFT(withSize: 1024, sampleRate: Constants.AUDIO_SAMPLE_RATE)
instead of
TempiFFT(withSize: CMSampleBufferGetNumSamples(sampleBuffer), sampleRate: Constants.AUDIO_SAMPLE_RATE)

Although it runs without getting errors, unfortunately the bins give strange results. The hanning or something isn't right. My visualizer I had made just isn't right any more.