Mercurial > ~darius > hgwebdir.cgi > musiccutter
annotate musiccutter.py @ 5:af683606184e
Paginate with a view port, a lot slower and wastes space but handling
notes between pages is trivial.
| author | Daniel O'Connor <darius@dons.net.au> |
|---|---|
| date | Tue, 08 Mar 2016 00:43:30 +1030 |
| parents | 9f4fa5f231e6 |
| children | 31db42ce72b8 |
| rev | line source |
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| 0 | 1 #!/usr/bin/env python |
| 2 | |
| 3 import exceptions | |
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4 import itertools |
| 0 | 5 import mido |
| 6 import svgwrite | |
| 7 import sys | |
| 8 | |
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9 def test(filename = None): |
| 0 | 10 # http://www.orgues-de-barbarie.com/wp-content/uploads/2014/09/format-cartons.pdf |
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11 conf = { 'notefile' : 'notes', 'pagewidth' : 20, 'pageheight' : 15.5, |
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12 'pitch' : 0.55, 'offset' : 0.60, 'timescale' : 1.0 } |
| 0 | 13 midi2note, note2midi = genmidi2note() |
| 14 note2slot = loadnote2slot(conf['notefile'], note2midi) | |
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15 if filename == None: |
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16 filename = 'test.midi' |
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17 midi2svg(filename, 'test%02d.svg', midi2note, note2midi, note2slot, conf['pagewidth'], conf['pageheight'], |
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18 conf['pitch'], conf['offset'], conf['timescale']) |
| 0 | 19 |
| 20 # http://www.electronics.dit.ie/staff/tscarff/Music_technology/midi/midi_note_numbers_for_octaves.htm | |
| 21 def genmidi2note(): | |
| 22 '''Create forward & reverse tables for midi number to note name (assuming 69 == A440)''' | |
| 23 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'] | |
| 24 midi2note = {} | |
| 25 note2midi = {} | |
| 26 for midi in range(128): | |
| 27 octave = midi / len(names) | |
| 28 index = midi % len(names) | |
| 29 name = names[index] % (octave) | |
| 30 midi2note[midi] = name | |
| 31 note2midi[name] = midi | |
| 32 | |
| 33 return midi2note, note2midi | |
| 34 | |
| 35 def loadnote2slot(fname, note2midi): | |
| 36 svg = svgwrite.Drawing(fname) | |
| 37 | |
| 38 note2slot = {} | |
| 39 index = 0 | |
| 40 | |
| 41 for note in file(fname): | |
| 42 note = note.strip() | |
| 43 if note[0] == '#': | |
| 44 continue | |
| 45 if note not in note2midi: | |
| 46 raise exceptions.ValueError('Note \'%s\' not valid' % note) | |
| 47 note2slot[note] = index | |
| 48 index += 1 | |
| 49 | |
| 50 return note2slot | |
| 51 | |
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52 def emitnote(svg, slot, start, notelen, pagewidth, pageheight, pitch, offset, timescale): |
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53 x = start / timescale |
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54 y = pageheight - (offset + slot * pitch) |
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55 w = notelen / timescale |
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56 h = pitch |
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57 print 'x = %.3f y = %.3f w = %.3f h = %.3f' % (x, y, w, h) |
| 1 | 58 svg.add(svgwrite.shapes.Rect(insert = ('%.3fcm' % (x), '%.3fcm' % (y)), |
| 59 size = ('%.3fcm' % (w), '%.3fcm' % (h)), | |
| 60 stroke = 'red', stroke_width = '1px', fill = 'red')) | |
| 0 | 61 |
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62 def midi2svg(inf, outpat, midi2note, note2midi, note2slot, pagewidth, pageheight, pitch, offset, timescale): |
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63 playablecount = 0 |
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64 unplayablecount = 0 |
| 0 | 65 midi = mido.MidiFile(inf) |
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66 ctime = 0 |
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67 channels = [] |
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68 svg = svgwrite.Drawing(outpat % (0), size = ('%.3fcm' % (pagewidth), '%.3fcm' % (pageheight))) |
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69 for i in range(16): |
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70 channels.append({}) |
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71 |
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72 pages = [] |
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73 for ev in midi: |
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74 ctime += ev.time |
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75 #print ctime, ev |
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76 if ev.type == 'note_on' and ev.velocity > 0: |
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77 if ev.note in channels[ev.channel]: |
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78 print 'Duplicate note_on message %d (%s)' % (ev.note, midi2note[ev.note]) |
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79 else: |
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80 channels[ev.channel][ev.note] = ctime |
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81 elif ev.type == 'note_off' or (ev.type == 'note_on' and ev.velocity == 0): |
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82 if ev.note not in channels[ev.channel]: |
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83 print 'note_off with no corresponding note_on for channel %d note %d' % (ev.channel, ev.note) |
| 0 | 84 else: |
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85 note = midi2note[ev.note] |
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86 if note not in note2slot: |
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87 print 'Skipping unplayable note %s' % (note) |
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88 unplayablecount += 1 |
| 0 | 89 else: |
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90 start = channels[ev.channel][ev.note] |
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91 notelen = ctime - start |
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92 slot = note2slot[note] |
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93 #print 'Note %s (%d) at %d length %d' % (note, slot, start, notelen) |
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94 emitnote(svg, slot, start, notelen, pagewidth, pageheight, pitch, offset, timescale) |
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95 playablecount += 1 |
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96 del channels[ev.channel][ev.note] |
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97 elif ev.type == 'end_of_track': |
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98 print 'EOT, not flushing, check for missed notes' |
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99 for chan in channels: |
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100 for ev in chan: |
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101 print ev |
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102 |
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103 npages = int(midi.length / timescale / pagewidth + 0.5) |
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104 print 'npages', npages |
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af683606184e
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105 for i in range(npages): |
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af683606184e
Paginate with a view port, a lot slower and wastes space but handling
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106 svg.viewbox(pagewidth / 2.54 * 96.0 * i, 0, pagewidth / 2.54 * 96.0, pageheight / 2.54 * 96.0) |
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107 svg.saveas(outpat % i) |
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108 |
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109 print 'Playable count:', playablecount |
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110 print 'Unplayable count:', unplayablecount |
| 0 | 111 |
| 112 if __name__ == '__main__': | |
| 113 main() |