Mercurial > ~darius > hgwebdir.cgi > musiccutter

annotate musiccutter.py @ 27:87cf66e04ef9

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Handle offsetting note pitch in a better way.
author Daniel O'Connor <darius@dons.net.au>
date Tue, 03 May 2016 08:31:28 +0930
parents f492b70f5e49
children 657bc32a0dfd
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1 #!/usr/bin/env python
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2
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3 import exceptions
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4 import itertools
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5 import math
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6 import mido
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7 import os.path
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8 import reportlab.lib.colors
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9 import reportlab.pdfgen.canvas
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10 from reportlab.lib.units import mm
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11 import sys
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12
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13 CUT_COLOUR = reportlab.lib.colors.red
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14 ENGRAVE_COLOUR = reportlab.lib.colors.black
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15
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16 def test(filename = None):
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17 if filename == None:
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18 filename = 'test.midi'
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19 # Card layout from http://www.orgues-de-barbarie.com/wp-content/uploads/2014/09/format-cartons.pdf
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20 # Notes are read from right to left
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21 # Highest note is at the bottom (closest to the crank)
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22 m = Midi2PDF('notes', 120, 155, 5.5, 3.3, 6.0, 50, False, False, False, False, 0, 10, 'Helvetica', 12)
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23 base, ext = os.path.splitext(filename)
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24 base = os.path.basename(base)
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25 m.processMidi(filename, base + '-%02d.pdf')
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26
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27 class Midi2PDF(object):
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28 def __init__(self, notefile, pagewidth, pageheight, pitch, slotsize, heel, leadin, timemarks, drawrect, notenames, notelines, noteoffset, timescale, fontname, fontsize):
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29 self.midi2note, self.note2midi = Midi2PDF.genmidi2note()
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30 self.note2slot, self.slot2note = Midi2PDF.loadnote2slot(notefile, self.note2midi)
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31 self.pagewidth = pagewidth # Dimensions are in millimetres
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32 self.pageheight = pageheight
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33 self.pitch = pitch # Distance between each slot
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34 self.slotsize = slotsize # Size of each slot cut out
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35 self.heel = heel # Bottom margin (from bottom of page to centre of slot)
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36 self.leadin = leadin # Extra at the start
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37 self.timemarks = timemarks # Draw vertical time lines
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38 self.drawrect = drawrect # Draw rectangle around each page
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39 self.notenames = notenames # Draw note names on the right edge
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40 self.notelines = notelines # Draw line rulers
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41 self.noteoffset = noteoffset # Amount to adjust note pitches by (+12 = 1 octave)
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42 self.timescale = timescale # Width per second
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43 self.fontname = fontname
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44 self.fontsize = fontsize # Points
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45
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46 def processMidi(self, midifile, outpat):
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47 playablecount = 0
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48 unplayablecount = 0
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49 midi = mido.MidiFile(midifile)
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50 ctime = 0
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51 channels = []
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52 for i in range(16):
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53 channels.append({})
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54
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55 npages = int(math.ceil(((midi.length * self.timescale) + self.leadin) / self.pagewidth))
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56 print 'npages', npages
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57 pdfs = []
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58 for i in range(npages):
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59 pdf = reportlab.pdfgen.canvas.Canvas(file(outpat % (i + 1), 'w'), pagesize = (self.pagewidth * mm, self.pageheight * mm))
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60 pdfs.append(pdf)
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61
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62 title = os.path.basename(midifile)
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63 title, ext = os.path.splitext(title)
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64 for ev in midi:
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65 # Adjust pitch of note (if it's a note)
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66 if hasattr(ev, 'note'):
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67 ev.note += self.noteoffset
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68 if ev.type == 'text' and ctime == 0:
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69 title = ev.text
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70
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71 ctime += ev.time
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72 if ev.type == 'note_on' or ev.type == 'note_off':
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73 note = self.midi2note[ev.note]
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74 #print ctime, ev
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75 if ev.type == 'note_on' and ev.velocity > 0:
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76 if ev.note in channels[ev.channel]:
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77 print 'Duplicate note_on message %d (%s)' % (ev.note, note)
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78 else:
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79 channels[ev.channel][ev.note] = ctime
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80 elif ev.type == 'note_off' or (ev.type == 'note_on' and ev.velocity == 0):
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81 if ev.note not in channels[ev.channel]:
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82 print 'note_off with no corresponding note_on for channel %d note %d' % (ev.channel, ev.note)
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83 else:
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84 if note not in self.note2slot:
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85 print 'Skipping unplayable note %d (%s)' % (ev.note, note)
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86 unplayablecount += 1
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87 else:
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88 start = channels[ev.channel][ev.note]
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89 notelen = ctime - start
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90 slot = self.note2slot[note]
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91 print 'Note %s (%d) at %.2f length %.2f' % (note, slot, start, notelen)
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92 self.emitnote(pdfs, slot, start, notelen)
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93 playablecount += 1
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94 del channels[ev.channel][ev.note]
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95 elif ev.type == 'end_of_track':
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96 print 'EOT, not flushing, check for missed notes'
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97 for chan in channels:
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98 for ev in chan:
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99 print ev
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100
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101 print 'Playable count:', playablecount
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102 print 'Unplayable count:', unplayablecount
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103
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104 for pindx in range(len(pdfs)):
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105 pdf = pdfs[pindx]
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106 # Add title and page number
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107 Midi2PDF.textHelper(pdf, 0 * mm, 1 * mm, ENGRAVE_COLOUR, True, self.fontname, self.fontsize, '%s (%d / %d)' % (title, pindx + 1, npages))
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108
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109 pdf.setLineWidth(0)
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110
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111 # Draw time marks
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112 if self.timemarks:
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113 tstart = self.leadin / self.timescale
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114 tend = self.pagewidth / self.timescale
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115 if pindx > 0:
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116 tsize = self.pagewidth / self.timescale
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117 tstart = tend + tsize * pindx
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118 tend = tend + tsize * (pindx + 1)
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119 for s in range(tstart, tend, 5):
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120 x = self.pagewidth - (float(s * self.timescale + self.leadin) % self.pagewidth)
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121 pdf.line(x * mm, self.heel, x * mm, self.pageheight * mm)
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122 Midi2PDF.textHelper(pdf, x * mm, 1 * mm, ENGRAVE_COLOUR, False, self.fontname, self.fontsize, str(s) + 's')
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123
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124 # Draw rectangle around page (upper and right hand ends don't seem to render though)
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125 if self.drawrect:
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126 pdf.rect(0, 0, self.pagewidth * mm, self.pageheight * mm, fill = False, stroke = True)
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127
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128 # Draw lines per note
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129 for slot in sorted(self.slot2note.keys()):
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130 ofs = self.pageheight - (self.heel + slot * self.pitch) - self.slotsize / 2
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131 if self.notelines:
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132 pdf.line(0, ofs * mm, self.pagewidth * mm, ofs * mm)
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133 # Note name
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134 if self.notenames:
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135 Midi2PDF.textHelper(pdf, (self.pagewidth - 10) * mm, (ofs + 0.5) * mm, ENGRAVE_COLOUR, False, self.fontname, self.fontsize, self.slot2note[slot])
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136
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137 # Save PDF
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138 pdf.save()
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139
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140 # http://newt.phys.unsw.edu.au/jw/notes.html
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141 @staticmethod
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142 def genmidi2note():
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143 '''Create forward & reverse tables for midi number to note name (assuming 69 = A4 = A440)'''
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144 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']
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145 midi2note = {}
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146 note2midi = {}
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147 for midi in range(21, 128):
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148 octave = midi / len(names) - 1
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149 index = midi % len(names)
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150 name = names[index] % (octave)
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151 midi2note[midi] = name
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152 note2midi[name] = midi
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153
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154 return midi2note, note2midi
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155
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156 @staticmethod
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157 def loadnote2slot(fname, note2midi):
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158 note2slot = {}
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159 slot2note = {}
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160 index = 0
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161
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162 for note in file(fname):
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163 note = note.strip()
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164 if note[0] == '#':
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165 continue
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166 if note not in note2midi:
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167 raise exceptions.ValueError('Note \'%s\' not valid' % note)
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168 note2slot[note] = index
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169 slot2note[index] = note
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170 index += 1
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171
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172 return note2slot, slot2note
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173
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174 def emitnote(self, pdfs, slot, start, notelen):
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175 x = start * self.timescale + self.leadin # Convert start time to distance
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176 pageidx = int(x / self.pagewidth) # Determine which page
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177 x = x % self.pagewidth # and where on that page
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178 h = self.slotsize
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179 y = self.pageheight - (self.heel + slot * self.pitch - self.slotsize / 2) - self.slotsize
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180 w = notelen * self.timescale # Convert note length in time to distance
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181
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182 print 'page = %d x = %.3f y = %.3f w = %.3f h = %.3f' % (pageidx, x, y, w, h)
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183 w1 = w
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184 # Check if the note crosses a page
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185 if x + w > self.pagewidth:
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186 w1 = self.pagewidth - x # Crop first note
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187 w2 = w - w1 # Calculate length of second note
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188 assert w2 <= self.pagewidth, 'note extends for more than a page'
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189 # Emit second half of note
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190 print 'split note, page %d w2 = %.3f' % (pageidx + 1, w2)
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191 Midi2PDF._emitnote(pdfs[pageidx + 1], self.pagewidth - w2, y, w2, h)
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192
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193 Midi2PDF._emitnote(pdfs[pageidx], self.pagewidth - x - w1, y, w1, h)
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194
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195 @staticmethod
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196 def _emitnote(pdf, x, y, w, h):
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197 pdf.saveState()
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198 pdf.setStrokeColor(CUT_COLOUR)
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199 pdf.setLineWidth(0)
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200 pdf.rect(x * mm, y * mm, w * mm, h * mm, fill = False, stroke = True)
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201 pdf.restoreState()
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202
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203 @staticmethod
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204 def textHelper(pdf, x, y, colour, fill, fontname, fontsize, text):
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205 tobj = pdf.beginText()
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206 tobj.setTextOrigin(x, y)
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207 tobj.setFont(fontname, fontsize)
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208 tobj.setStrokeColor(colour)
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209 tobj.setFillColor(colour)
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210 if fill:
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211 tobj.setTextRenderMode(0)
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212 else:
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213 tobj.setTextRenderMode(1)
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214 tobj.textLine(text)
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215 pdf.drawText(tobj)
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216
0
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217 if __name__ == '__main__':
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218 main()