How can I get frequency data from PCM using FFT

Question

I have an array of audio data I am passing to a reader:

 recorder.read(audioData,0,bufferSize); 

The instantiation is as follows:

Answer 1

Assuming the audioData array contains the raw audio data, you need to create a Complex[] object from the audioData array as such:

Complex[] complexData = new Complex[audioData.length];
for (int i = 0; i < complexData.length; i++) {
    complextData[i] = new Complex(audioData[i], 0);
}

Now you can pass your complexData object as a parameter to your FFT function:

Complex[] fftResult = FFT.fft(complexData);