MT32: Update MT-32 emulator to latest Munt code

Several changes against original code were made. They were intentionally
kept to the minimum

1 files changed, 86 insertions, 0 deletions

diff --git a/audio/softsynth/mt32/AReverbModel.h b/audio/softsynth/mt32/AReverbModel.h
new file mode 100644
index 0000000000..3fae08c34c
--- /dev/null
+++ b/audio/softsynth/mt32/AReverbModel.h
@@ -0,0 +1,86 @@
+/* Copyright (C) 2003, 2004, 2005, 2006, 2008, 2009 Dean Beeler, Jerome Fisher
+ * Copyright (C) 2011 Dean Beeler, Jerome Fisher, 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 MT32EMU_A_REVERB_MODEL_H
+#define MT32EMU_A_REVERB_MODEL_H
+
+namespace MT32Emu {
+
+struct AReverbSettings {
+	const Bit32u *allpassSizes;
+	const Bit32u *delaySizes;
+	const float *decayTimes;
+	const float *wetLevels;
+	float filtVal;
+	float damp1;
+	float damp2;
+};
+
+class RingBuffer {
+protected:
+	float *buffer;
+	Bit32u size;
+	Bit32u index;
+public:
+	RingBuffer(Bit32u size);
+	virtual ~RingBuffer();
+	float next();
+	bool isEmpty();
+	void mute();
+};
+
+class AllpassFilter : public RingBuffer {
+public:
+	AllpassFilter(Bit32u size);
+	float process(float in);
+};
+
+class Delay : public RingBuffer {
+public:
+	Delay(Bit32u size);
+	float process(float in);
+};
+
+class AReverbModel : public ReverbModel {
+	AllpassFilter **allpasses;
+	Delay **delays;
+
+	const AReverbSettings *currentSettings;
+	float decayTime;
+	float wetLevel;
+	float filterhist1, filterhist2;
+	float combhist;
+	void mute();
+public:
+	AReverbModel(const AReverbSettings *newSettings);
+	~AReverbModel();
+	void open(unsigned int sampleRate);
+	void close();
+	void setParameters(Bit8u time, Bit8u level);
+	void process(const float *inLeft, const float *inRight, float *outLeft, float *outRight, unsigned long numSamples);
+	bool isActive() const;
+
+	static const AReverbSettings REVERB_MODE_0_SETTINGS;
+	static const AReverbSettings REVERB_MODE_1_SETTINGS;
+	static const AReverbSettings REVERB_MODE_2_SETTINGS;
+};
+
+// Default reverb settings for modes 0-2
+
+}
+
+#endif