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audio/softsynth/mt32/srchelper/srctools/include/LinearResampler.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_LINEAR_RESAMPLER_H
+#define SRCTOOLS_LINEAR_RESAMPLER_H
+
+#include "ResamplerStage.h"
+
+namespace SRCTools {
+
+static const unsigned int LINEAR_RESAMPER_CHANNEL_COUNT = 2;
+
+class LinearResampler : public ResamplerStage {
+public:
+	LinearResampler(double sourceSampleRate, double targetSampleRate);
+	~LinearResampler() {}
+
+	unsigned int estimateInLength(const unsigned int outLength) const;
+	void process(const FloatSample *&inSamples, unsigned int &inLength, FloatSample *&outSamples, unsigned int &outLength);
+
+private:
+	const double inputToOutputRatio;
+	double position;
+	FloatSample lastInputSamples[LINEAR_RESAMPER_CHANNEL_COUNT];
+};
+
+} // namespace SRCTools
+
+#endif // SRCTOOLS_LINEAR_RESAMPLER_H