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wav2midi.py
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wav2midi.py
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# -*- coding: utf-8 -*-
"""
Created on Sun Apr 2 17:14:35 2023
@author: wmy
"""
import os
import wave
import librosa
import librosa.display
import python3_midi as midi
import music21
import numpy as np
import matplotlib.pyplot as plt
from IPython.display import Audio
from tqdm import tqdm
y, sr = librosa.load(r'test4.wav', sr=None)
print("Sample Rate: {}".format(sr))
Audio(data=y, rate=sr)
# settings
hop_length = 512
y_harmonic, y_percussive = librosa.effects.hpss(y)
tempo, beat_frames = librosa.beat.beat_track(y=y_percussive, sr=sr, hop_length=hop_length)
beat_times = librosa.frames_to_time(beat_frames, sr=sr, hop_length=hop_length)
print("BPM: {}".format(tempo))
Audio(data=y_harmonic, rate=sr)
Audio(data=y_percussive, rate=sr)
CQT = librosa.cqt(y, sr=sr, hop_length=hop_length, fmin=librosa.note_to_hz('A0'), n_bins=88, bins_per_octave=12)
C = np.abs(CQT)
C_dB = librosa.amplitude_to_db(C, ref=np.max)
idx = tuple([slice(None), slice(*list(librosa.time_to_frames([0, 5], sr=sr, hop_length=hop_length)))])
fig, ax = plt.subplots()
img = librosa.display.specshow(C_dB[idx], sr=sr, hop_length=hop_length, y_axis='cqt_note', x_axis='time', \
fmin=librosa.note_to_hz('A0'), fmax=librosa.note_to_hz('C8'))
ax.set_title('Constant-Q power spectrum')
fig.colorbar(img, ax=ax, format="%+2.0f dB")
# 轨道数
num_tracks = 16
# 截断音量 （dB）
cutoff_power = -70
# 最短音符 8分 16分 32分
unit_note = 16
class PianoTrack(object):
def __init__(self, unit_note, tempo):
self.__lowest_pitch = 21
self.__highest_pitch = 108
self.__pitch_span = 88
mm = music21.tempo.MetronomeMark()
mm.setQuarterBPM(tempo)
self.streams = [music21.stream.Stream(mm) for x in range(self.__pitch_span)]
self.notestate = np.array([0 for x in range(self.__pitch_span)])
self.noteduration = np.array([0 for x in range(self.__pitch_span)])
self.notevelocity = np.array([0 for x in range(self.__pitch_span)])
self.unit_note = unit_note
pass
def note_on(self, pitch, velocity):
note_i = pitch - self.__lowest_pitch
# 纵连
if self.notestate[note_i] == 1:
note = music21.note.Note(pitch)
note.duration.quarterLength = self.noteduration[note_i] * 4 / self.unit_note
note.volume.velocity = self.notevelocity[note_i]
self.streams[note_i].append(note)
pass
# 休止符
elif self.noteduration[note_i] > 0:
note = music21.note.Rest()
note.duration.quarterLength = self.noteduration[note_i] * 4 / self.unit_note
self.streams[note_i].append(note)
pass
self.notevelocity[note_i] = velocity
self.notestate[note_i] = 1
self.noteduration[note_i] = 0
pass
def note_off(self, pitch):
note_i = pitch - self.__lowest_pitch
if self.notestate[note_i] == 0:
return
note = music21.note.Note(pitch)
note.duration.quarterLength = self.noteduration[note_i] * 4 / self.unit_note
note.volume.velocity = self.notevelocity[note_i]
self.streams[note_i].append(note)
self.notestate[note_i] = 0
self.noteduration[note_i] = 0
pass
def update(self):
self.noteduration = self.noteduration + 1
pass
pass
beat_frames = beat_frames.tolist()
while beat_frames[0] - (beat_frames[1] - beat_frames[0]) >= 0:
beat_frames.insert(0, beat_frames[0] - (beat_frames[1] - beat_frames[0]))
pass
while beat_frames[-1] + (beat_frames[-1] - beat_frames[-2]) < C_dB.shape[-1]:
beat_frames.append(beat_frames[-1] + (beat_frames[-1] - beat_frames[-2]))
pass
beat_frames = np.array(beat_frames)
piano_lowest_pitch = 21
piano_pitch_span = 88
pitch_span = piano_pitch_span
tracks = [PianoTrack(unit_note, tempo) for x in range(num_tracks)]
prevpower = np.array([np.min(C_dB.T) for x in range(pitch_span)])
prevamplitude = np.array([np.min(C.T) for x in range(pitch_span)])
for beati in tqdm(range(len(beat_frames)-1)):
bsframe = beat_frames[beati]
beframe = beat_frames[beati+1]
duration = (beframe - bsframe) * 4 / unit_note
for i in range(unit_note//4):
nsframe = bsframe + int(i * duration + 0.5)
neframe = bsframe + int((i+1) * duration + 0.5)
power = np.max(C_dB.T[nsframe:neframe, :], axis=0)
amplitude = np.max(C.T[nsframe:neframe, :], axis=0)
for notei in reversed(range(pitch_span)):
n = power[notei]
p = prevpower[notei]
if (n - p) <= -3:
pitch = notei + piano_lowest_pitch
for track in tracks:
track.note_off(pitch)
pass
pass
elif (n - p) > 0 and n >= cutoff_power:
pitch = notei + piano_lowest_pitch
for track in tracks:
track.note_off(pitch)
pass
velocity = int(127 * amplitude[notei] ** 0.5 / np.max(C.T) ** 0.5)
track_index = min(num_tracks-1, int((power[notei] - cutoff_power) / ((0 - cutoff_power) / num_tracks)))
tracks[track_index].note_on(pitch, velocity)
pass
pass
for track in tracks:
track.update()
prevpower = power
prevamplitude = amplitude
pass
pass
pass
mf = music21.midi.MidiFile()
parti = 1
for track in tqdm(tracks[::-1]):
part = music21.stream.Part(track.streams).chordify()
miditrack = music21.midi.translate.streamHierarchyToMidiTracks(part, acceptableChannelList=[parti])
if parti == 1:
mf.tracks.append(miditrack[0])
mf.tracks.append(miditrack[1])
pass
else:
mf.tracks.append(miditrack[1])
pass
parti += 1
pass
mf.open(r'test4_512.mid', 'wb')
mf.write()
mf.close()