MT32: Update Munt to 2.0.3

This update uses upstream commit
777c51cdb4dbb4e02a53c23edea9086f0b600e26.

The new SampleRateConverter is added, but not built as we don't use it.
Also, building it without source changes will need additional include
directories.

This update of Munt reduces the stack size, and thus fixes bug #9630.

1 files changed, 67 insertions, 0 deletions

diff --git a/audio/softsynth/mt32/srchelper/srctools/include/FIRResampler.h b/audio/softsynth/mt32/srchelper/srctools/include/FIRResampler.h
new file mode 100644
index 0000000000..2c5d69052a
--- /dev/null
+++ b/audio/softsynth/mt32/srchelper/srctools/include/FIRResampler.h
@@ -0,0 +1,67 @@
+/* Copyright (C) 2015-2017 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 FIR_RESAMPLER_H
+#define FIR_RESAMPLER_H
+
+#include "ResamplerStage.h"
+
+namespace SRCTools {
+
+typedef FloatSample FIRCoefficient;
+
+static const unsigned int FIR_INTERPOLATOR_CHANNEL_COUNT = 2;
+
+class FIRResampler : public ResamplerStage {
+public:
+	FIRResampler(const unsigned int upsampleFactor, const double downsampleFactor, const FIRCoefficient kernel[], const unsigned int kernelLength);
+	~FIRResampler();
+
+	void process(const FloatSample *&inSamples, unsigned int &inLength, FloatSample *&outSamples, unsigned int &outLength);
+	unsigned int estimateInLength(const unsigned int outLength) const;
+
+private:
+	const struct Constants {
+		// Filter coefficients
+		const FIRCoefficient *taps;
+		// Indicates whether to interpolate filter taps
+		bool usePhaseInterpolation;
+		// Size of array of filter coefficients
+		unsigned int numberOfTaps;
+		// Upsampling factor
+		unsigned int numberOfPhases;
+		// Downsampling factor
+		double phaseIncrement;
+		// Index of last delay line element, generally greater than numberOfTaps to form a proper binary mask
+		unsigned int delayLineMask;
+		// Delay line
+		FloatSample(*ringBuffer)[FIR_INTERPOLATOR_CHANNEL_COUNT];
+
+		Constants(const unsigned int upsampleFactor, const double downsampleFactor, const FIRCoefficient kernel[], const unsigned int kernelLength);
+	} constants;
+	// Index of current sample in delay line
+	unsigned int ringBufferPosition;
+	// Current phase
+	double phase;
+
+	bool needNextInSample() const;
+	void addInSamples(const FloatSample *&inSamples);
+	void getOutSamplesStereo(FloatSample *&outSamples);
+}; // class FIRResampler
+
+} // namespace SRCTools
+
+#endif // FIR_RESAMPLER_H