Horrible Music

music.py

#!/usr/bin/env python3
import simpleaudio as sa
import numpy as np
import sys
import wave

kick = wave.open("kick.wav")

class Mixer:
    def __init__(self, wav, secs):
        self.sampwidth = wav.getsampwidth()
        self.samprate = wav.getframerate()
        self.nframes = wav.getnframes()
        self.position = 0
        self.time = 0
        self.progress = 0.2
        self.writers = []
        self.output = np.empty(secs * self.sampwidth * self.samprate, "float")

        bs = wav.readframes(self.nframes)
        self.data = np.empty(self.nframes, "float")
        for i in range(0, self.nframes):
            high = bs[i * 2]
            low = bs[i * 2 + 1]
            self.data[i] = (high << 8 | low)

    def add(self):
        self.writers.append(self.position)

    def proceed(self, secs):
        idx = int(self.position)
        samps = secs * self.sampwidth * self.samprate
        self.position += samps
        self.time += secs

        self.progress -= secs
        if self.progress < 0:
            sys.stderr.write(f" {self.time} -- {len(self.writers)} concurrent   \r")
            self.progress = 0.2

        while idx <= self.position:
            for start_pos in self.writers:
                offset = int(idx - start_pos)
                if offset >= self.nframes:
                    continue

                samp = self.data[offset]
                self.output[idx] += samp
            idx += 1

        for i, start_pos in enumerate(self.writers):
            offset = int(idx - start_pos)
            if offset > self.nframes:
                if i == len(self.writers) - 1:
                    self.writers.pop()
                else:
                    self.writers[i] = self.writers.pop()

    def play(self):
        return sa.play_buffer(np.array(self.output, "byte"), 1, self.sampwidth, self.samprate)

    def save(self, name):
        f = wave.open(name, "wb")
        f.setnchannels(1)
        f.setsampwidth(self.sampwidth)
        f.setframerate(self.samprate)
        f.writeframes(np.array(self.output, "byte"))

m = Mixer(kick, 102)

def playHz(hz, sec):
    t = 0
    while t < sec:
        m.add()
        m.proceed(1 / hz)
        t += 1 / hz

for i in range(0, 2):
    m.add()
    m.proceed(1)

for i in range(0, 4):
    m.add()
    m.proceed(0.5)

for i in range(0, 8):
    m.add()
    m.proceed(0.25)

for i in range(0, 15):
    m.add()
    m.proceed(0.125)

print("\nramping")
hz = 8
while hz < 98:
    m.add()
    m.proceed(1 / hz)
    hz += 4 / hz
playHz(98, 0.5)

# Frequencies from https://pages.mtu.edu/~suits/notefreqs.html
print("\ngo")
playHz(110, 0.5)
playHz(123.47, 0.5)
playHz(110, 0.5)
playHz(130.81, 0.5)

playHz(146.83, 0.5)
playHz(130.81, 0.5)
playHz(123.47, 1)
#

playHz(110, 0.5)
playHz(123.47, 0.5)
playHz(110, 0.5)
playHz(130.81, 0.5)

playHz(123.47, 2)
#
#
#

playHz(110, 0.5)
playHz(123.47, 0.5)
playHz(110, 0.5)
playHz(130.81, 0.5)

playHz(146.83, 0.5)
playHz(130.81, 0.5)
playHz(123.47, 1)
#

playHz(130.81, 1)
#
playHz(123.47, 1)
#

playHz(110, 2)
#
#
#


print("\nramping 2")
hz = 110
while hz < 392:
    m.add()
    m.proceed(1 / hz)
    hz += 16 / hz
print("\nA's")
playHz(440, 2)
playHz(220, 2)
playHz(110, 2)
playHz(60, 2)
playHz(30, 2)
playHz(15, 2)
playHz(7.5, 2)

m.proceed(2)
print("\ndone")
m.save("music.wav")

m.play().wait_done()