# wav_stereo.py

# wav_stereo.py

from struct import pack
import math
import wave
import random
import sys
import array

dir='C://py//audio//'

RATE=44100

def makeSineWaveFile(freq=100, duration=3, sampleRate=44100):
    freq = int(freq)
    duration = int(duration)
    sampleRate = int(sampleRate)
    #duration = 3 # seconds
    #freq = 100 # of cycles per second (Hz) (frequency of the sine waves)
    volume = 100 # percent
    data = array.array('h') # signed short integer (-32768 to 32767) data
    #sampleRate = 44100 # of samples per second (standard)
    numChan = 2 # of channels (1: mono, 2: stereo)
    dataSize = 2 # 2 bytes because of using signed short integers => bit depth = 16
    numSamplesPerCyc = int(sampleRate / freq)
    numSamples = (sampleRate * duration) / 2
    for i in range(numSamples):
        for hz in (200,500):
            sample = 32767 * float(volume) / hz
            sample *= math.sin(math.pi * 2 * (i % numSamplesPerCyc) / numSamplesPerCyc)
            data.append(int(sample))
    f = wave.open(dir+'wav_stereo.wav', 'w') # .mp3 or .wav
    f.setparams((numChan, dataSize, sampleRate, numSamples, "NONE", "Uncompressed"))
    f.writeframes(data.tostring())
    f.close()

makeSineWaveFile()