def swapBlocks(sound, block1, block2, blockSize):
  for i in range(0, blockSize):
    sampleIndexNum1 = (block1 * blockSize) - blockSize + 1 + i
    sampleIndexNum2 = (block2 * blockSize) - blockSize + 1 + i

    temp1 = getSampleValueAt (sound, sampleIndexNum1)
    temp2 = getSampleValueAt (sound, sampleIndexNum2)

    setSampleValueAt (sound, sampleIndexNum1, temp2)
    setSampleValueAt (sound, sampleIndexNum2, temp1)
  return sound

def driver1 ():
    file = pickAFile()
    sound = makeSound(file)
    numSamples = getLength(sound)
    rate = getSamplingRate(sound)
    print numSamples, ", ", rate, ", ", numSamples/rate
    
    s2 = swapBlocks (sound, 2, 4, 44100)

    play (s2)