L6 1

from wave import open
from struct import Struct
from math import floor

frame_rate = 11025

def encode(x):
    i = int(16384 * x)
    return Struct("h").pack(i)

def play(sampler,name='song.wav',seconds=2):
    out = open(name,'wb')
    out.setnchannels(1)
    out.setsampwidth(2)
    out.setframerate(frame_rate)
    t=0
    while t<seconds*frame_rate:
        sample = sampler(t)
        out.writeframes(encode(sample))
        t=t+1
    out.close()


def tri(frequency,amplitude=0.3):
    period = frame_rate//frequency
    def sampler(t):
        saw_wave = t/period - floor(t/period+0.5)
        tri_wave = 2*abs(2*saw_wave)-1
        return amplitude*tri_wave
    return sampler

c_freq,e_freq,g_freq= 261.63,329.63,392.00

def both(f,g):
    return lambda t: f(t)+g(t)


def note(f,start,end,fade=0.01):
    def sampler(t):
        seconds = t / frame_rate
        if seconds<start:
            return 0
        elif seconds>end:
            return 0
        elif seconds<start+fade:
            return (seconds-start)/fade*f(t)
        elif seconds>end-fade:
            return (end-seconds)/fade*f(t)
        else:
            return f(t)
    return sampler

def mario_at(octave):
    c,e = tri(octave*c_freq),tri(octave*e_freq)
    g,low_g = tri(octave*g_freq),tri(octave*g_freq/2)
    return mario(c,e,g,low_g)

def mario(c,e,g,low_g):
    z = 0
    song = note(e,z,z+1/8)
    z += 1/8
    song = both(song,note(e,z,z+1/8))
    z += 1/4
    song = both(song,note(e,z,z+1/8))
    z += 1/4
    song = both(song,note(c,z,z+1/8))
    z += 1/8
    song = both(song,note(e,z,z+1/8))
    z += 1/4
    song = both(song,note(g,z,z+1/4))
    z += 1/2
    song = both(song,note(low_g,z,z+1/4))
    z+=1/2
    return song

play(mario_at(3))

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