module MIDIOps::Note
Constants
- KEY_OFFSETS
Public Class Methods
key_to_code(key, octave)
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# File lib/midiops/note.rb, line 35 def key_to_code key, octave KEY_OFFSETS[key] + 12 + (12 * octave) end
note_to_code(note)
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# File lib/midiops/note.rb, line 57 def note_to_code note res = parse_note note key_to_code res[:key], res[:octave] end
parse_note(note)
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# File lib/midiops/note.rb, line 39 def parse_note note # formats to accept: "C3" / "B-1" / "C#4" (sharp) / "Db5" (flat) case note when /^([A-Ga-g])(-?[0-9]{1,2})$/ m = $~.captures {key: m[0].upcase.to_sym, octave: m[1].to_i} when /^([CDFGAcdfga])\#(-?[0-9]{1,2})$/ m = $~.captures {key: "#{m[0].upcase}sharp".to_sym, octave: m[1].to_i} when /^([DEGABdegab])b(-?[0-9]{1,2})$/ m = $~.captures {key: "#{m[0].upcase}flat".to_sym, octave: m[1].to_i} else raise RuntimeError, "Invalid note format: #{note}" end end