source: python/demos/demo_wav2midi.py @ 34dca87

feature/autosinkfeature/constantqfeature/pitchshiftfeature/pydocstringsfeature/timestretch
Last change on this file since 34dca87 was 34dca87, checked in by Paul Brossier <piem@piem.org>, 2 years ago

python/demos/demo_wav2midi.py: remove unused variables

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[3c6a3c4]1#! /usr/bin/env python
2
3# Simple demo to extract notes from a sound file, and store them in a midi file
4# using mido.
5#
6# Install mido: `pip instal mido`
7#
8# Documentation: https://mido.readthedocs.io/
9
10import sys
11from aubio import source, notes
12from mido import Message, MetaMessage, MidiFile, MidiTrack, second2tick, bpm2tempo
13
14if len(sys.argv) < 3:
15    print("Usage: %s <filename> <output> [samplerate]" % sys.argv[0])
16    sys.exit(1)
17
18filename = sys.argv[1]
19midioutput = sys.argv[2]
20
21downsample = 1
22samplerate = 44100 // downsample
23if len( sys.argv ) > 3: samplerate = int(sys.argv[3])
24
25win_s = 512 // downsample # fft size
26hop_s = 256 // downsample # hop size
27
28s = source(filename, samplerate, hop_s)
29samplerate = s.samplerate
30
31tolerance = 0.8
32
33notes_o = notes("default", win_s, hop_s, samplerate)
34
35print("%8s" % "time","[ start","vel","last ]")
36
37# create a midi file
38mid = MidiFile()
39track = MidiTrack()
40mid.tracks.append(track)
41
42ticks_per_beat = mid.ticks_per_beat # default: 480
43bpm = 120 # default midi tempo
44
45tempo = bpm2tempo(bpm)
46track.append(MetaMessage('set_tempo', tempo=tempo))
47track.append(MetaMessage('time_signature', numerator=4, denominator=4))
48
49def frames2tick(frames, samplerate=samplerate):
50    sec = frames / float(samplerate)
[34dca87]51    return int(second2tick(sec, ticks_per_beat, tempo))
[3c6a3c4]52
53last_time = 0
54
55# total number of frames read
56total_frames = 0
57while True:
58    samples, read = s()
59    new_note = notes_o(samples)
60    if (new_note[0] != 0):
61        note_str = ' '.join(["%.2f" % i for i in new_note])
62        print("%.6f" % (total_frames/float(samplerate)), new_note)
63        delta = frames2tick(total_frames) - last_time
64        if new_note[2] > 0:
65            track.append(Message('note_off', note=int(new_note[2]),
66                velocity=127, time=0)
67                )
68        track.append(Message('note_on',
69            note=int(new_note[0]),
70            velocity=int(new_note[1]),
71            time=delta)
72            )
73        last_time = frames2tick(total_frames)
74    total_frames += read
75    if read < hop_s: break
76
77mid.save(midioutput)
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