def create_beat(
self,
samples: Dict[float, NDArray[Float32]] = None,
sample_rate: int = 44100,
) -> AudioFile:
"""
Create a beat from the pattern in the sequencer.
"""
if samples is not None:
raise ValueError(
"Samples are not needed to create a beat for an MidiSequencer!"
)
mid = PrettyMIDI(initial_tempo=self.bpm)
drum_track = Instrument(program=0, is_drum=True, name="drums")
mid.instruments.append(drum_track)
for row in self.pattern:
for note in row:
if note is not None:
drum_track.notes.append(note)
return AudioFile(
np.array(mid.fluidsynth(fs=sample_rate), dtype=np.float32),
self.bpm,
sample_rate,
)
def pm_to_wav(pm: PrettyMIDI, filename: str, rate=16000):
waveform = pm.fluidsynth(fs=rate)
wavfile.write(filename, rate, waveform)
def _make_pcm(self, pm: pretty_midi.PrettyMIDI):
audio_data = pm.fluidsynth()
return f64le_to_s32le(audio_data)
transposition = 12 - keys.index(key) # transpose leftward
transposed_generated_music = transpose_sequence(generated_music, \
transposition = transposition)
transposed_seed_music = transpose_sequence(seed_music, transposition = \
transposition)
bpm = st.sidebar.number_input('Set the bpm (beats per minute) in the '\
'range [20, 180]', min_value = 20, max_value = 180,\
value = 60, key = 'bpm')
# st.sidebar.write('bpm = {}'.format(bpm))
for music_type in ['seed', 'generated']:
if (st.button('Create MIDI File for the ' + music_type.title() + \
' Music', key = music_type)):
fpath = './midi_output/{0}_{1}.mid'.format(music_type, session_id)
exec('convert_to_midi(transposed_{0}_music, '.format(music_type) + \
'bpm = bpm, output_file = fpath)')
midi_data = PrettyMIDI(fpath)
audio_data = midi_data.fluidsynth()
audio_data = np.int16(
audio_data / np.max(np.abs(audio_data)) * 32767 * 0.9
) # -- Normalize for 16 bit audio https://github.com/jkanner/streamlit-audio/blob/main/helper.py
virtualfile = BytesIO()
wavfile.write(virtualfile, 44100, audio_data)
st.write('Play temporary .wav file:')
st.audio(virtualfile)
st.markdown(get_binary_file_downloader_html(fpath, 'MIDI'),
unsafe_allow_html=True)