Initial revision

kiss_fft.h

@@ -0,0 +1,45 @@
+#ifndef KISS_FFT_H
+#define KISS_FFT_H
+
+#ifndef kiss_fft_scalar
+# ifdef FIXED_POINT
+#   define kiss_fft_scalar short
+# else
+#   define kiss_fft_scalar float
+# endif
+#endif
+
+
+typedef struct {
+    kiss_fft_scalar r;
+    kiss_fft_scalar i;
+}kiss_fft_cpx;
+
+/* 
+ *  fft_alloc
+ *  
+ *  Initialize a radix 2 FFT (or IFFT) algorithm.
+ *
+ *  The return value from fft_alloc is a cfg buffer used internally
+ *  by the fft routine.
+ *
+ *  Call free() on it when done using it to avoid memory leaks.
+ * */
+void* kiss_fft_alloc(int nfft,int inverse_fft); 
+// free() the state when done using it
+
+/*
+ * kiss_fft
+ *
+ * Perform an in-place FFT on a complex input buffer.
+ *
+ * the input buffer should be real(f[0]) , imag(f[0]), ... ,real(f[nfft-1]) , imag(f[nfft-1])
+ * the the output will be     real(F[0]) , imag(F[0]), ... ,real(F[nfft-1]) , imag(F[nfft-1])
+ *
+ * */
+void kiss_fft( const void* cfg , kiss_fft_cpx *f ); // call for each buffer 
+
+// when done with the cfg for a given fft size and direction, simply free it
+#define kiss_fft_free free
+
+#endif