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spear2midi.py
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spear2midi.py
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#!/usr/bin/env python3
"""
Prepares a MIDI file for reproducing transients from Spear-analysis files on a hardware or software synth.
Spear text partials export format:
index points start end
time frequency amplitude [time frequency amplitude] ...
"""
__author__ = "Are Johansen Ormberg"
__version__ = "0.0.1"
__license__ = "CC"
from math import log, floor, ceil, trunc
import rtmidi
from mido import MidiFile, MidiTrack, Message, open_output
from traces import TimeSeries
class Partial:
"Individual partial with properties exported from Spear"
freq_ts = TimeSeries()
freq_vector = []
amp_ts = TimeSeries()
amp_vector = []
start = 0
end = 0
length = 0
index = 0
root_frequency = 440
pb_range = 2
note_list = MidiTrack()
midiout = ''
def __init__(self, index, length, start, end, time_vector, freq_vector, amp_vector, root_frequency, pb_range, midiout):
self.index = index
self.length = length
self.start = int(start*1000)
self.end = int(end*1000)
freq_vector = list(map(lambda x: float(x.replace(',','.')), freq_vector))
self.time_vector = list(map(lambda x: floor(float(x.replace(',','.'))*1000), time_vector))
amp_vector = list(map(lambda x: float(x.replace(',','.')), amp_vector))
#redestribute irregular time data
for k,t in enumerate(self.time_vector):
self.freq_ts[t] = (freq_vector[k])
self.amp_ts[t] = (amp_vector[k])
self.freq_ts = self.freq_ts.sample(sampling_period=5,start=self.start,end=self.end,interpolate='linear')
self.amp_ts = self.amp_ts.sample(sampling_period=5,start=self.start,end=self.end,interpolate='linear')
self.freq_vector = [x[1] for x in self.freq_ts]
self.amp_vector = [x[1] for x in self.amp_ts]
self.root_frequency = root_frequency
self.pb_range = pb_range
print("index"+index)
self.build_note_list(0, len(self.freq_vector))
self.note_list.append(Message('note_off', note=64, velocity=0, time=24))
self.midiout = midiout
def build_note_list(self, start, end):
# print(start,end,len(self.freq_vector[start:end]))
list_length = len(self.freq_vector[start:end])
if list_length < 3: return
distance = midi_note_distance(max(self.freq_vector[start:end]),min(self.freq_vector[start:end]),self.root_frequency)
if distance < (self.pb_range*2):
midi_note = floor(f2st(min(self.freq_vector[start:end]), self.root_frequency) + 69 + (self.pb_range))
if midi_note < 0 or midi_note > 127: return
self.note_list.append(Message('note_on', note=midi_note, velocity=64, time=0))
print(self.note_list[-1])
for i, f in enumerate(self.freq_vector[start:end]):
time = 3
if i == 0 or i == list_length-1: time = 0
bend = frequency_to_pitchbend(f, midi_note, self.root_frequency, self.pb_range)
self.note_list.append(Message('pitchwheel', pitch=bend, time=time))
print(self.note_list[-1])
self.note_list.append(Message('note_off', note=midi_note, velocity=64, time=0))
print(self.note_list[-1])
else:
middle = ((end-start)//2)+start
# print(start,middle,end)
self.build_note_list(start, middle)
self.build_note_list(middle+1, end)
def midi_note_distance(fmax,fmin,root_frequency):
return ceil(f2st(fmax, root_frequency)) - floor(f2st(fmin, root_frequency))
def f2st(hz, base=440):
"Frequency to semitones function. Adapted from https://rdrr.io/cran/hqmisc/man/f2st.html"
semi1 = log(2)/12
return((log(hz) - log(base))/semi1)
def frequency_to_pitchbend(frequency, midi_note, root_frequency, pb_range):
return floor((percentage(f2st(frequency) + 69, midi_note - pb_range, midi_note + pb_range) * 16382)-8191)
def percentage(x,a,b):
return (x-a)/(b-a)
def midi_note_to_frequency(midi_note, root_frequency):
return (root_frequency / 32) * (2 ** ((midi_note - 9) / 12))
def pairwise(iterable):
"from https://stackoverflow.com/a/5389547"
a = iter(iterable)
return zip(a, a)
def main():
#open spear file
with open('Untitled.txt') as f:
spear = f.readlines()
root_frequency = 440
pb_range = 2
#init midi file
mid = MidiFile()
tracks = MidiTrack()
#init out port
midiout = rtmidi.MidiOut()
available_ports = midiout.get_ports()
if available_ports:
midiout.open_port(0)
else:
midiout.open_virtual_port("Virtual port")
#read data from spear file
partials = []
for a,b in pairwise(spear[4:]):
a_split = a.split(' ')
b_split = b.split(' ')
partials.append(
Partial(a_split[0].replace(',','.'),
float(a_split[1].replace(',','.')),
float(a_split[2].replace(',','.')),
float(a_split[3].replace(',','.')),
b_split[0::3],
b_split[1::3],
b_split[2::3],
root_frequency,
pb_range,
midiout
)
)
tracks.extend(partials[-1].note_list)
mid.tracks.append(tracks)
mid.save('output.mid')
if __name__ == "__main__":
main()