uus fft

src/fft.h

@@ -3,5 +3,16 @@
 #include <math.h>
 
 #define FFT_SIZE 2048
-void init_hamming_window();
-void compute_fft(float* time_data, float* freq_out);
+// Simple complex number struct
+struct Complex {
+    float re, im;
+    Complex(float r = 0, float i = 0) : re(r), im(i) {}
+    Complex operator+(const Complex& o) const { return { re + o.re, im + o.im }; }
+    Complex operator-(const Complex& o) const { return { re - o.re, im - o.im }; }
+    Complex operator*(const Complex& o) const {
+        return { re * o.re - im * o.im, re * o.im + im * o.re };
+    }
+};
+
+void fft(Complex* x, int N, Complex* buffer);
+