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import matplotlib.pyplot as plt
import librosa.display
from pretty_midi import PrettyMIDI
# Note: these functions are meant to be played within an interactive Python shell
# Please refer to the synth.ipynb for an example of how to use them
def get_music(midi_file):
"""
Load a midi file and return the PrettyMIDI object and the audio signal
"""
music = PrettyMIDI(midi_file=midi_file)
waveform = music.fluidsynth()
return music, waveform
def show_piano_roll(music_notes, fs=100):
"""
Show the piano roll of a music piece, with all instruments squashed onto a single 128xN matrix
:param music_notes: PrettyMIDI object
:param fs: sampling frequency
"""
# get the piano roll
piano_roll = music_notes.get_piano_roll(fs)
print("Piano roll shape: {}".format(piano_roll.shape))
# plot the piano roll
plt.figure(figsize=(12, 4))
librosa.display.specshow(piano_roll, sr=100, x_axis="time", y_axis="cqt_note")
plt.colorbar()
plt.title("Piano roll")
plt.tight_layout()
plt.show()
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