Audio: Add MIDI format playback support

This adds a new dependency with libfuildsynth. MIDI support is built by default, but can be disabled if not desired. All RTP songs should work well, but there are known problems with other files (see README). Also, the pitch shift implementation is somewhat poor and doesn't match RMXP (at least subjectively). A soundfont is not included and must be provided by the user themself.
2014-07-31 03:32:07 +02:00 · 2014-07-31 03:32:07 +02:00 · 751fdc599e
commit 751fdc599e
parent 818ca18ebb
17 changed files with 1170 additions and 35 deletions
--- a/src/sharedmidistate.h
+++ b/src/sharedmidistate.h
@ -0,0 +1,138 @@
+/*
+** sharedmidistate.h
+**
+** This file is part of mkxp.
+**
+** Copyright (C) 2014 Jonas Kulla <Nyocurio@gmail.com>
+**
+** mkxp is free software: you can redistribute it and/or modify
+** it under the terms of the GNU General Public License as published by
+** the Free Software Foundation, either version 2 of the License, or
+** (at your option) any later version.
+**
+** mkxp 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 General Public License for more details.
+**
+** You should have received a copy of the GNU General Public License
+** along with mkxp.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef SHAREDMIDISTATE_H
+#define SHAREDMIDISTATE_H
+
+#include "config.h"
+#include "debugwriter.h"
+
+#include <fluidsynth.h>
+
+#include <assert.h>
+#include <vector>
+#include <string>
+
+#define SYNTH_INIT_COUNT 2
+#define SYNTH_SAMPLERATE 44100
+
+struct Synth
+{
+	fluid_synth_t *synth;
+	bool inUse;
+};
+
+struct SharedMidiState
+{
+	bool inited;
+	std::vector<Synth> synths;
+	const std::string &soundFont;
+	fluid_settings_t *flSettings;
+
+	SharedMidiState(const Config &conf)
+	    : inited(false),
+	      soundFont(conf.midi.soundFont)
+	{
+		flSettings = new_fluid_settings();
+		fluid_settings_setnum(flSettings, "synth.gain", 1.0);
+		fluid_settings_setnum(flSettings, "synth.sample-rate", SYNTH_SAMPLERATE);
+		fluid_settings_setstr(flSettings, "synth.chorus.active", conf.midi.chorus ? "yes" : "no");
+		fluid_settings_setstr(flSettings, "synth.reverb.active", conf.midi.reverb ? "yes" : "no");
+	}
+
+	~SharedMidiState()
+	{
+		delete_fluid_settings(flSettings);
+
+		for (size_t i = 0; i < synths.size(); ++i)
+		{
+			assert(!synths[i].inUse);
+			delete_fluid_synth(synths[i].synth);
+		}
+	}
+
+	fluid_synth_t *addSynth(bool usedNow)
+	{
+		fluid_synth_t *syn = new_fluid_synth(flSettings);
+
+		if (!soundFont.empty())
+			fluid_synth_sfload(syn, soundFont.c_str(), 1);
+		else
+			Debug() << "Warning: No soundfont specified, sound might be mute";
+
+		Synth synth;
+		synth.inUse = usedNow;
+		synth.synth = syn;
+		synths.push_back(synth);
+
+		return syn;
+	}
+
+	void initDefaultSynths()
+	{
+		if (inited)
+			return;
+
+		for (size_t i = 0; i < SYNTH_INIT_COUNT; ++i)
+			addSynth(false);
+
+		inited = true;
+	}
+
+	fluid_synth_t *allocateSynth()
+	{
+		size_t i;
+
+		initDefaultSynths();
+
+		for (i = 0; i < synths.size(); ++i)
+			if (!synths[i].inUse)
+				break;
+
+		if (i < synths.size())
+		{
+			fluid_synth_t *syn = synths[i].synth;
+			fluid_synth_system_reset(syn);
+			synths[i].inUse = true;
+
+			return syn;
+		}
+		else
+		{
+			return addSynth(true);
+		}
+	}
+
+	void releaseSynth(fluid_synth_t *synth)
+	{
+		size_t i;
+
+		for (i = 0; i < synths.size(); ++i)
+			if (synths[i].synth == synth)
+				break;
+
+		assert(i < synths.size());
+
+		synths[i].inUse = false;
+	}
+};
+
+#endif // SHAREDMIDISTATE_H