1 files changed, 45 insertions, 0 deletions
diff --git a/src/plugins/Visual/analyzer/fft.h b/src/plugins/Visual/analyzer/fft.h
new file mode 100644
index 000000000..431afa365
--- /dev/null
+++ b/src/plugins/Visual/analyzer/fft.h
@@ -0,0 +1,45 @@
+/* fft.h: Header for iterative implementation of a FFT
+ * Copyright (C) 1999 Richard Boulton <richard@tartarus.org>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#ifndef _FFT_H_
+#define _FFT_H_
+
+#define FFT_BUFFER_SIZE_LOG 9
+
+#define FFT_BUFFER_SIZE (1 << FFT_BUFFER_SIZE_LOG)
+
+/* sound sample - should be an signed 16 bit value */
+typedef short int sound_sample;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* FFT library */
+    typedef struct _struct_fft_state fft_state;
+    fft_state *fft_init(void);
+    void fft_perform(const sound_sample * input, float *output,
+                     fft_state * state);
+    void fft_close(fft_state * state);
+
+
+
+#ifdef __cplusplus
+}
+#endif
+#endif                          /* _FFT_H_ */