# tones.py

# tones.py

import math
import wave
import struct

audio = []
sample_rate = 44100.0
dir = 'C://py//audio//'

def append_silence(duration_milliseconds=500):
    """
    Adding silence is easy - we add zeros to the end of our array
    """
    num_samples = duration_milliseconds * (sample_rate / 1000.0)

    for x in range(int(num_samples)):
        audio.append(0.0)


def append_sinewave(
        freq=440.0,
        duration_milliseconds=500,
        volume=1.0):

    num_samples = duration_milliseconds * (sample_rate / 1000.0)

    for x in range(int(num_samples)):
        audio.append(volume * math.sin(2 * math.pi * freq * ( x / sample_rate )))


def save_wav(file_name):
    # open up a mp3 file
    mp3_file=wave.open(dir+file_name+".mp3","w")

    # wav params
    nchannels = 1

    sampwidth = 2

    # 44100 is the industry standard sample rate - CD quality.
    nframes = len(audio)
    comptype = "NONE"
    compname = "not compressed"
    mp3_file.setparams((nchannels, sampwidth, sample_rate, nframes, comptype, compname))

    for sample in audio:
        mp3_file.writeframes(struct.pack('h', int( sample * 32767.0 )))

    mp3_file.close()

def noteToFreq(note):
    a = 440 # common value frequency is 440Hz
    return (a / 32.) * (2 ** ((note - 9.) / 12))

audio = []
for _ in range(8):
    append_sinewave(freq=noteToFreq(80),duration_milliseconds=30)
    append_sinewave(freq=noteToFreq(85),duration_milliseconds=60)
    append_sinewave(freq=noteToFreq(90),duration_milliseconds=30)
append_silence(duration_milliseconds=150)
save_wav("testing")

notes = [45, 47, 48, 50, 52, 53, 55, 57, 59, 60, 62, 64, 65, 67, 69]

for i in range(len(notes)):
    audio = []
    append_sinewave(freq=noteToFreq(notes[i]+12),duration_milliseconds=200)
    save_wav("note"+str(i+1))