--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/musiccutter.py	Sat Mar 05 21:59:44 2016 +1030
@@ -0,0 +1,93 @@
+#!/usr/bin/env python
+
+import exceptions
+import mido
+import svgwrite
+import sys
+
+def test():
+    # http://www.orgues-de-barbarie.com/wp-content/uploads/2014/09/format-cartons.pdf
+    conf = { 'notefile' : 'notes', 'pitch' : 5.5 }
+    midi2note, note2midi = genmidi2note()
+    note2slot = loadnote2slot(conf['notefile'], note2midi)
+    midi2svg('test.midi', 'test%d.svg', conf['pitch'], midi2note, note2midi, note2slot)
+
+# http://www.electronics.dit.ie/staff/tscarff/Music_technology/midi/midi_note_numbers_for_octaves.htm
+def genmidi2note():
+    '''Create forward & reverse tables for midi number to note name (assuming 69 == A440)'''
+    names = ['C%d', 'C%d#', 'D%d', 'D%d#', 'E%d', 'F%d', 'F%d#', 'G%d', 'G%d#', 'A%d', 'A%d#', 'B%d']
+    midi2note = {}
+    note2midi = {}
+    for midi in range(128):
+        octave = midi / len(names)
+        index = midi % len(names)
+        name = names[index] % (octave)
+        midi2note[midi] = name
+        note2midi[name] = midi
+
+    return midi2note, note2midi
+
+def loadnote2slot(fname, note2midi):
+    svg = svgwrite.Drawing(fname)
+
+    note2slot = {}
+    index = 0
+
+    for note in file(fname):
+        note = note.strip()
+        if note[0] == '#':
+            continue
+        if note not in note2midi:
+            raise exceptions.ValueError('Note \'%s\' not valid' % note)
+        note2slot[note] = index
+        index += 1
+
+    return note2slot
+
+def emitnote(svg, slot, start, notelen):
+    # Let us say 185 ticks for a quaver and that is 5mm long
+    tickscale = 185.0 / 5.0
+    pitch = 5.5
+    offset = 6
+    x = start / tickscale
+    y = offset + slot * pitch
+    w = notelen / tickscale
+    h = pitch
+    print x, y, w, h
+    svg.add(svgwrite.shapes.Rect(insert = ('%.3fcm' % (x / 10, '%.3fcm' % (y / 10)), size = (w, h), stroke = 'red', stroke_width = '1px', fill = 'red'))
+
+def midi2svg(inf, outpat, pitch, midi2note, note2midi, note2slot):
+    midi = mido.MidiFile(inf)
+    svg = svgwrite.Drawing(outpat % (0))
+    tnum = 0
+    for t in midi.tracks:
+        print "Track", tnum
+        tnum += 1
+        channels = []
+        for i in range(16):
+                channels.append({})
+        ctime = 0
+        for ev in t:
+            ctime += ev.time
+            if ev.type == 'note_on' and ev.velocity > 0:
+                if ev.note in channels[ev.channel]:
+                    print "Duplicate channel on message"
+                else:
+                    channels[ev.channel][ev.note] = ctime
+            elif ev.type == 'note_off' or (ev.type == 'note_on' and ev.velocity == 0):
+                    if ev.note not in channels[ev.channel]:
+                        print 'Note_off with no corresponding note_on for track %d channel %d note %d' % (tnum, ev.channel, ev.note)
+                    else:
+                        note = midi2note[ev.note]
+                        if note not in note2slot:
+                            print 'Skipping unplayable note %s' % (note)
+                        else:
+                            notelen = ctime - channels[ev.channel][ev.note]
+                            slot = note2slot[note]
+                            print 'Note %s (%d) at %d length %d' % (note, slot, ctime, notelen)
+                            emitnote(svg, slot, ctime, notelen)
+                        del channels[ev.channel][ev.note]
+        svg.save()
+
+if __name__ == '__main__':
+    main()