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Asked: 2026-05-23T00:06:08+00:00

I am in need for some assistance/guidance with using Core Audio to extract floats

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I am in need for some assistance/guidance with using Core Audio to extract floats from the sound out device. I have read similar posts regarding the extraction of floats from AIFF. My end goal is something along the lines of:

  • iTunes is playing a song

  • C/C++ program using Core Audio
    extracts float values from the sound
    device (in real-time)

  • Use resulting float vector to perform
    Fourier Transformation on a array of
    floats (probably using vDSP from
    Apple’s Accelerate Library) – This part I have somewhat figured out 🙂

Note: I am developing on Mac OS X (10.6+).

Any help will be much appreciated.

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1 Answer

  1. Editorial Team

    This question comes up frequently on the Core Audio mailing list. There is no easy way to accomplish what you want to do. See:

    http://lists.apple.com/archives/coreaudio-api/2007/Jul/msg00066.html
    http://lists.apple.com/archives/coreaudio-api/2009/Nov/msg00308.html

    You’ll need to write either a kext or a user-land driver.

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