First draft of the EQ visualization system. Now force fed to all plugin UIs.

git-svn-id: svn://localhost/ardour2/branches/3.0@3958 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 65 insertions, 0 deletions

diff --git a/gtk2_ardour/fft.h b/gtk2_ardour/fft.h
new file mode 100644
index 0000000000..a68ed59edc
--- /dev/null
+++ b/gtk2_ardour/fft.h
@@ -0,0 +1,65 @@
+/*
+    Copyright (C) 2008 Paul Davis
+    Author: Sampo Savolainen
+
+    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., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#ifndef __ardour_fft_h__
+#define __ardour_fft_h__
+
+
+#include <iostream>
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <complex> // this needs to be included before fftw3.h
+#include <fftw3.h>
+
+
+#include <ardour/types.h>
+
+class FFT
+{
+	public:
+		FFT(uint32_t);
+		~FFT();
+
+		void reset();
+		void analyze(ARDOUR::Sample *);
+		void calculate();
+
+		uint32_t bins() const { return _dataSize; }
+
+		float powerAtBin(uint32_t i) const { return _powerAtBin[i]; }
+		float phaseAtBin(uint32_t i) const { return _phaseAtBin[i]; }
+
+	private:
+
+		uint32_t const _windowSize;
+		uint32_t const _dataSize;
+		uint32_t _iterations;
+
+		float *_fftInput;
+		float *_fftOutput;
+
+		float *_powerAtBin;
+		float *_phaseAtBin;
+
+		fftwf_plan _plan;
+};
+
+#endif