basic DSP lib (for lua bindings)

1 files changed, 72 insertions, 0 deletions

diff --git a/libs/ardour/ardour/dsp_filter.h b/libs/ardour/ardour/dsp_filter.h
new file mode 100644
index 0000000000..ae2928de93
--- /dev/null
+++ b/libs/ardour/ardour/dsp_filter.h
@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2016 Robin Gareus <robin@gareus.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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ */
+#ifndef _dsp_filter_h_
+#define _dsp_filter_h_
+
+#include <stdint.h>
+#include "ardour/libardour_visibility.h"
+
+namespace ARDOUR { namespace DSP {
+
+	void memset (float *data, const float val, const uint32_t n_samples);
+	void mmult (float *data, float *mult, const uint32_t n_samples);
+
+
+	class LIBARDOUR_API LowPass {
+		public:
+			LowPass (double samplerate, float freq);
+			void proc (float *data, const uint32_t n_samples);
+			void ctrl (float *data, const float val, const uint32_t n_samples);
+			void set_cutoff (float freq);
+			void reset () { _z =  0.f; }
+		private:
+			float _rate;
+			float _z;
+			float _a;
+	};
+
+	class LIBARDOUR_API BiQuad {
+		public:
+			enum Type {
+				LowPass,
+				HighPass,
+				BandPassSkirt,
+				BandPass0dB,
+				Notch,
+				AllPass,
+				Peaking,
+				LowShelf,
+				HighShelf
+			};
+
+			BiQuad (double samplerate);
+			BiQuad (const BiQuad &other);
+
+			void run (float *data, const uint32_t n_samples);
+			void compute (Type, double freq, double Q, double gain);
+			void reset () { _z1 = _z2 = 0.0; }
+		private:
+			double _rate;
+			float  _z1, _z2;
+			double _a1, _a2;
+			double _b0, _b1, _b2;
+	};
+
+} } /* namespace */
+#endif