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, 47 insertions, 0 deletions

diff --git a/audio/softsynth/mt32/srchelper/srctools/src/LinearResampler.cpp b/audio/softsynth/mt32/srchelper/srctools/src/LinearResampler.cpp
new file mode 100644
index 0000000000..98b9c77c73
--- /dev/null
+++ b/audio/softsynth/mt32/srchelper/srctools/src/LinearResampler.cpp
@@ -0,0 +1,47 @@
+/* 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/>.
+ */
+
+#include "LinearResampler.h"
+
+using namespace SRCTools;
+
+LinearResampler::LinearResampler(double sourceSampleRate, double targetSampleRate) :
+	inputToOutputRatio(sourceSampleRate / targetSampleRate),
+	position(1.0) // Preload delay line which effectively makes resampler zero phase
+{}
+
+void LinearResampler::process(const FloatSample *&inSamples, unsigned int &inLength, FloatSample *&outSamples, unsigned int &outLength) {
+	if (inLength == 0) return;
+	while (outLength > 0) {
+		while (1.0 <= position) {
+			position--;
+			inLength--;
+			for (unsigned int chIx = 0; chIx < LINEAR_RESAMPER_CHANNEL_COUNT; ++chIx) {
+				lastInputSamples[chIx] = *(inSamples++);
+			}
+			if (inLength == 0) return;
+		}
+		for (unsigned int chIx = 0; chIx < LINEAR_RESAMPER_CHANNEL_COUNT; chIx++) {
+			*(outSamples++) = FloatSample(lastInputSamples[chIx] + position * (inSamples[chIx] - lastInputSamples[chIx]));
+		}
+		outLength--;
+		position += inputToOutputRatio;
+	}
+}
+
+unsigned int LinearResampler::estimateInLength(const unsigned int outLength) const {
+	return static_cast<unsigned int>(outLength * inputToOutputRatio);
+}