import portaudio
BUFFER_SIZE = 1024
wf = wave.open(sys.argv[1], 'rb')
atexit.register(wf.close)
nchannels, sampwidth, framerate, nframes, comptype, compname = wf.getparams()
def callback(in_list, out_list, time_info, user_data):
frames = wf.readframes(len(out_list) / nchannels)
if len(frames) < len(out_list):
return portaudio.COMPLETE
if sampwidth == 1:
values = struct.unpack('%dB' % (len(frames) / nchannels), frames)
elif sampwidth == 2:
values = struct.unpack('%dh' % (len(frames) / nchannels), frames)
for i in range(len(out_list)):
out_list[i] = values[i]
return portaudio.CONTINUE
portaudio.initialize()
atexit.register(portaudio.terminate)
stream = portaudio.open_default_stream(0, nchannels, portaudio.INT16,
framerate, BUFFER_SIZE, callback, None)
stream.start()
while stream.is_active():
time.sleep(1)
saw_wave = lambda x: x % 2 - 1
sine_wave = lambda x: sin(x * pi)
square_wave = lambda x: int(x % 2) * 2 - 1
white_noise = lambda x: random()
def callback(in_list, out_list, time_info, user_data):
if user_data[0] < NOTE_FREQUENCY:
func = saw_wave
elif user_data[0] < NOTE_FREQUENCY * 2:
func = sine_wave
elif user_data[0] < NOTE_FREQUENCY * 3:
func = square_wave
else:
func = white_noise
for i in range(0, len(out_list), 2):
user_data[0] += NOTE_FREQUENCY / SAMPLE_RATE
out_list[i] = func(user_data[0])
out_list[i+1] = func(user_data[0])
return portaudio.CONTINUE
portaudio.initialize()
register(portaudio.terminate)
stream = portaudio.open_default_stream(0, 2, portaudio.FLOAT32, SAMPLE_RATE,
BUFFER_SIZE, callback, [0.0])
stream.start()
sleep(4)
stream.abort()
