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audio/softsynth/mt32/srchelper/srctools/include/SincResampler.h

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+/* Copyright (C) 2015-2022 Sergey V. Mikayev
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Lesser General Public License as published by
+ *  the Free Software Foundation, either version 2.1 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 Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef SRCTOOLS_SINC_RESAMPLER_H
+#define SRCTOOLS_SINC_RESAMPLER_H
+
+#include "FIRResampler.h"
+
+namespace SRCTools {
+
+class ResamplerStage;
+
+namespace SincResampler {
+
+	ResamplerStage *createSincResampler(const double inputFrequency, const double outputFrequency, const double passbandFrequency, const double stopbandFrequency, const double dbSNR, const unsigned int maxUpsampleFactor);
+
+	namespace Utils {
+		void computeResampleFactors(unsigned int &upsampleFactor, double &downsampleFactor, const double inputFrequency, const double outputFrequency, const unsigned int maxUpsampleFactor);
+		unsigned int greatestCommonDivisor(unsigned int a, unsigned int b);
+	}
+
+	namespace KaizerWindow {
+		double estimateBeta(double dbRipple);
+		unsigned int estimateOrder(double dbRipple, double fp, double fs);
+		double bessel(const double x);
+		void windowedSinc(FIRCoefficient kernel[], const unsigned int order, const double fc, const double beta, const double amp);
+	}
+
+} // namespace SincResampler
+
+} // namespace SRCTools
+
+#endif // SRCTOOLS_SINC_RESAMPLER_H