On Mar 29, 2008, at 9:40 AM, John DeRyckere wrote:
Hi, I've been poking around with Quartz Composer and the __protocolInput_AudioSpectrum structure for a little while. I do have a couple questions relating to the returned structure: 1) What are the frequency ranges of each bucket in the spectrum?
The values are normalized [0, 1]
2) What is the update interval for the spectrum?
The audio spectrum is updated every time the visualizer selected in iTunes updates (Remember that at present, you need to have a composition running in iTunes in order to get any audio data in the Editor). Due to the way they have their rendering timers set up, this could be significantly lower than the rendering framerate you would expect to get in QuartzComposer editor for the same composition. I believe this is capped at 60fps.
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