#Sine wave music generator by Iykury
#Copy this text into a .py file and run with Python 3 (Download at https://www.python.org/downloads/)
#Note: Audio sounds a bit noisy because it's only an 8-bit LPCM

#Notes to play (characters for notes in ASCII/Unicode order; ! is A0 and x is C8)
#The uncommented line will be used for notes
notes = list("TOTRPRTOTVTVXT[YXVXT[YXVTOTRPRTOTVTVXT[YXVXT[YXV") #Melody
#notes = list("CHLAFJCHLAFJCHLAFJCHLAFJCHLAFJCHLAFJCHLAFJCHLAFJ") #Chords

rate = 44100 #Sample rate
amp = 127.5 #Amplitude (Maximum 127.5)
lng = rate*.25 #Length of one unit of time in samples (rate*seconds)

import math #Used to calculate sine

fil = open("notes.raw", "w") #Open file
fil.write("") #Delete all data in file
fil.close() #Close file
fil = open("notes.raw", "ab") #Open file again in binary and append mode

nts = notes.__len__() #Number of notes to write

trt = 2**(1/12) #Twelfth root of two
a0 = 27.5 #Frequency of the lowest key on an 88-key piano
for q in range(0, nts):
    notes[q] = a0*trt**(ord(notes[q])-33) #Replace characters with frequencies of notes

wav = 0 #How far into the wave (0 = beginning, 1 = end)
for i in range(0, nts):
    #If note character is a space i.e. the note is below A0, write silence
    if notes[i] < 27.5:
        smp = 0
        byte = [128]
        while(smp < lng):
            fil.write(bytes(byte))
            smp += 1
    #Otherwise, write the note
    else:
        frq = notes[i] #Get note frequency
        smp = 0 #How far into the note (samples)
        while(smp < lng):
            if wav > 1: #If over 100% far into wave, subtract 100%
                wav = wav-1 #i.e. 105% becomes 5%
            byte = [round(math.sin(wav*2*math.pi)*amp+128)] #Calculate which byte to write based on how far into wave
            fil.write(bytes(byte)) #Write byte
            smp += 1 #Increase how far into note
            wav += frq/rate #Increase how far into wave