74 lines
1.9 KiB
Plaintext
74 lines
1.9 KiB
Plaintext
/*
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* MIDI Dump - Parse and print MIDI file contents
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*
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* Usage: cell run examples/dump.ce <midi_file>
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*/
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var io = use('cellfs')
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var midi = use('midi')
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if (length(args) < 1) {
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log.console("Usage: cell run examples/dump.ce <midi_file>")
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log.console("Example: cell run examples/dump.ce examples/invent8.mid")
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$stop()
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}
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var midi_file = args[0]
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log.console("Loading MIDI: " + midi_file)
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var midi_blob = io.slurp(midi_file)
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if (!midi_blob) {
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log.console("Error: Could not load MIDI file: " + midi_file)
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$stop()
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}
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var song = midi.parse(midi_blob)
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log.console("Duration: " + text((song.duration_ms / 1000)) + "s")
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log.console("Notes: " + text(song.note_count))
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log.console("Events: " + text(length(song.events)))
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log.console("")
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var NOTE_NAMES = ['C', 'C#', 'D', 'D#', 'E', 'F', 'F#', 'G', 'G#', 'A', 'A#', 'B']
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function note_name(key) {
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var octave = floor(key / 12) - 1
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var name = NOTE_NAMES[key % 12]
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return name + text(octave)
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}
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function pad(s, n) {
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var _s = text(s)
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while (length(_s) < n) {
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_s = _s + ' '
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}
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return _s
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}
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var events = song.events
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var i = 0
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var evt = null
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var line = ''
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for (i = 0; i < length(events); i++) {
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evt = events[i]
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line = pad(text(evt.time / 1000) + 's', 10)
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line = line + 'ch=' + pad(evt.channel, 4)
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if (evt.type == 'note_on') {
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line = line + pad('note_on', 12) + note_name(evt.key) + ' vel=' + text(evt.velocity)
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} else if (evt.type == 'note_off') {
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line = line + pad('note_off', 12) + note_name(evt.key)
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} else if (evt.type == 'control') {
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line = line + pad('control', 12) + 'cc=' + text(evt.control) + ' val=' + text(evt.value)
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} else if (evt.type == 'program') {
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line = line + pad('program', 12) + 'preset=' + text(evt.program)
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} else if (evt.type == 'pitch_bend') {
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line = line + pad('pitch_bend', 12) + 'val=' + text(evt.pitch_bend)
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} else if (evt.type == 'tempo') {
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line = line + pad('tempo', 12) + 'bpm=' + text(evt.tempo)
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}
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log.console(line)
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}
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