1 files changed, 32 insertions, 0 deletions
diff --git a/flow/fft.h b/flow/fft.h
new file mode 100644
index 0000000..009f764
--- /dev/null
+++ b/flow/fft.h
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+#ifndef ARTS_FFT_H
+#define ARTS_FFT_H
+
+/*
+ * BC - Status (2002-03-08): arts_fft_float
+ *
+ * This fft interface should be obsoleted in the future in favour of one
+ * exploiting the capabilities of gsl fully. However, it will be kept binary
+ * compatible to avoid everybody to reimplement/duplicate their own fft.
+ */
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * performs an fft
+ */
+void arts_fft_float (
+    unsigned  NumSamples,          /* must be a power of 2 */
+    int       InverseTransform,    /* 0=forward FFT, 1=inverse FFT */
+    float    *RealIn,              /* array of input's real samples */
+    float    *ImaginaryIn,         /* array of input's imag samples */
+    float    *RealOut,             /* array of output's reals */
+    float    *ImaginaryOut );      /* array of output's imaginaries */
+
+
+#ifdef __cplusplus
+}
+#endif
+#endif /* ARTS_FFT_H */