def write(self, buff, frames_per_buffer):
if frames_per_buffer is None:
frames_per_buffer = len(frames_per_buffer)
value = _portaudio.Pa_GetStreamWriteAvailable(self.stream)
if value < 0:
# if value is negative, its a PaError code
try:
raise get_exception(value)
except NoError:
pass
err = _portaudio.Pa_WriteStream(self.stream, byref(buff), c_ulong(frames_per_buffer))
try:
raise get_exception(err)
except NoError:
pass
def open(self, mode='rw', input_parameters=None, output_parameters=None, callback=None, user_data=None):
if 'w' in mode:
output_parameters = output_parameters or self.build_output_parameters()
if 'r' in mode:
input_parameters = input_parameters or self.build_input_parameters()
if callback:
# we need to save a reference to the callback so it is not garbage collected
pa_stream_callback = PaStreamCallback(callback)
self._callbacks.append(pa_stream_callback)
if user_data is not None:
py_object_user_data = py_object(user_data)
self._user_datum.append(py_object_user_data)
err = _portaudio.Pa_OpenStream(byref(self.stream),
byref(input_parameters) if input_parameters else None,
byref(output_parameters) if output_parameters else None,
self.sample_rate,
self.frames_per_buffer,
self.flags,
pa_stream_callback if callback else None,
py_object_user_data if user_data else None)
try:
raise get_exception(err)
except NoError:
pass
def __enter__(self):
try:
err = _portaudio.Pa_Initialize()
raise get_exception(err)
except NoError:
pass
return self
def read(self, size=None):
if size is None:
size = self.frames_per_buffer
value = _portaudio.Pa_GetStreamReadAvailable(self.stream)
if value < 0:
# if value is negative, its a PaError code
try:
raise get_exception(value)
except NoError:
pass
buff = c_void_p()
err = _portaudio.Pa_ReadStream(self.stream, byref(buff), c_ulong(size))
try:
raise get_exception(err)
except NoError:
pass
return buff
def stop(self):
err = _portaudio.Pa_StopStream(self.stream)
try:
raise get_exception(err)
except NoError:
pass
def close(self):
err = _portaudio.Pa_CloseStream(self.stream)
try:
raise get_exception(err)
except NoError:
pass
def __exit__(self, type, value, traceback):
err = _portaudio.Pa_Terminate()
try:
raise get_exception(err)
except NoError:
pass
