lumps: Autogenerate optimized DMXGUS lump.

Replace the current poor-quality handcrafted GUS configuration with
a script that programatically generates an optimized configuration
file based on statistical analysis of music from various popular WAD
files.

lumps/dmxgus/gather_stats.py

@@ -0,0 +1,83 @@
+#!/usr/bin/env python
+#
+# Copyright (c) 2013 Contributors to the Freedoom project.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#  * Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+#  * Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+#  * Neither the name of the freedoom project nor the names of its
+#    contributors may be used to endorse or promote products derived from
+#    this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+# IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+# PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
+# OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
+# ----------------------------------------------------------------------
+#
+# Script to gather statistics from MIDI files about instrument usage.
+# Generates stats.py which is used as input for the ultramid.ini
+# generator script.
+#
+# This script requires python-midi; see here:
+#   https://github.com/vishnubob/python-midi
+#
+
+import midi
+import sys
+
+def get_instr_stats(filename):
+	"""Get a set of instruments used by the specified MIDI file."""
+	result = set()
+	midfile = midi.read_midifile(filename)
+
+	for track in midfile:
+		for event in track:
+			if isinstance(event, midi.ProgramChangeEvent) \
+			   and event.channel != 9:
+				instr = event.data[0]
+				result.add(instr)
+			# Percussion:
+			if isinstance(event, midi.NoteOnEvent) \
+			   and event.channel == 9:
+				instr = event.data[0] + 128
+				result.add(instr)
+
+	return result
+
+total_stats = [0] * 217
+
+for filename in sys.argv[1:]:
+	print "Processing %s" % filename
+	stats = get_instr_stats(filename)
+	print sorted(stats)
+	for instrument in stats:
+		total_stats[instrument] += 1
+
+with open("stats.py", "w") as f:
+	f.write("# Instrument stats, autogenerated by gather_stats.py\n\n")
+	f.write("INSTRUMENT_STATS = [\n\t")
+
+	for index, stat in enumerate(total_stats):
+		f.write("% 5i," % stat)
+		if (index % 10) == 9:
+			f.write("\n\t")
+
+	f.write("\n]\n")
+
+