diff options
| author | Piotr Pawlow <pp@siedziba.pl> | 2014-03-13 20:51:31 +0100 |
|---|---|---|
| committer | Piotr Pawlow <pp@siedziba.pl> | 2014-03-13 20:51:31 +0100 |
| commit | c04af18902322cea1bd05b6f01b7860ca7bfa432 (patch) | |
| tree | d8d3f812112c0cc835fd29e68d92e297e0164b52 /src/lingot-fft.h | |
- import version 0.9.1 from upstream
Diffstat (limited to 'src/lingot-fft.h')
| -rw-r--r-- | src/lingot-fft.h | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/src/lingot-fft.h b/src/lingot-fft.h new file mode 100644 index 0000000..6195da0 --- /dev/null +++ b/src/lingot-fft.h @@ -0,0 +1,51 @@ +/*
+ * lingot, a musical instrument tuner.
+ *
+ * Copyright (C) 2004-2011 Ibán Cereijo Graña, Jairo Chapela Martínez.
+ *
+ * This file is part of lingot.
+ *
+ * lingot 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.
+ *
+ * lingot 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 lingot; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef _LINGOT_FFT_H_
+#define _LINGOT_FFT_H_
+
+/*
+ Fourier transforms.
+ */
+
+#include "lingot-defs.h"
+
+#ifndef LIB_FFTW
+
+# include "lingot-complex.h"
+# include "lingot-config.h"
+
+void lingot_fft_create_phase_factors(LingotConfig* conf);
+void lingot_fft_destroy_phase_factors();
+
+// Fast Fourier Transform implementation.
+void lingot_fft_fft(FLT* in, LingotComplex* out, unsigned long int N);
+
+#endif // not LIB_FFTW
+
+// Spectral Power Distribution (SPD) esteem, selectively in frequency.
+void lingot_fft_spd(FLT* in, int N1, FLT wi, FLT dw, FLT* out, int N2);
+
+// first and second SPD derivatives at frequency w.
+void lingot_fft_spd_diffs(FLT* in, int N, FLT w, FLT* out_d1, FLT* out_d2);
+
+#endif
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