def write(self, frames, num_frames=None, exception_on_underflow=False):
"""
Write samples to the stream. Do not call when using
*non-blocking* mode.
:param frames:
The frames of data.
:param num_frames:
The number of frames to write.
Defaults to None, in which this value will be
automatically computed.
:param exception_on_underflow:
Specifies whether an IOError exception should be thrown
(or silently ignored) on buffer underflow. Defaults
to False for improved performance, especially on
slower platforms.
:raises IOError: if the stream is not an output stream
or if the write operation was unsuccessful.
:rtype: `None`
"""
if not self._is_output:
raise IOError("Not output stream",
paCanNotWriteToAnInputOnlyStream)
if num_frames == None:
# determine how many frames to read
width = get_sample_size(self._format)
num_frames = int(len(frames) / (self._channels * width))
#print len(frames), self._channels, self._width, num_frames
pa.write_stream(self._stream, frames, num_frames,
exception_on_underflow)
def run(self):
"""
Plays the audio. This method plays the audio, and shouldn't be called
explicitly, let the constructor do so.
"""
# From now on, it's multi-thread. Let the force be with them.
st = self.stream._stream
for chunk in chunks(self.audio,
size=self.chunk_size*self.nchannels,
dfmt=self.dfmt):
#Below is a faster way to call:
# self.stream.write(chunk, self.chunk_size)
_portaudio.write_stream(st, chunk, self.chunk_size, False)
if not self.go.is_set():
self.stream.stop_stream()
if self.halting:
break
self.go.wait()
self.stream.start_stream()
# Finished playing! Destructor-like step: let's close the thread
with self.lock:
if self in self.device_manager._threads: # If not already closed
self.stream.close()
self.device_manager.thread_finished(self)
def write(self, frames, num_frames = None,
exception_on_underflow = False):
"""
Write samples to the stream.
:param `frames`:
The frames of data.
:param `num_frames`:
The number of frames to write.
Defaults to None, in which this value will be
automatically computed.
:param `exception_on_underflow`:
Specifies whether an exception should be thrown
(or silently ignored) on buffer underflow. Defaults
to False for improved performance, especially on
slower platforms.
:raises IOError: if the stream is not an output stream
or if the write operation was unsuccessful.
:rtype: `None`
"""
if not self._is_output:
raise IOError("Not output stream",
paCanNotWriteToAnInputOnlyStream)
if num_frames == None:
# determine how many frames to read
width = get_sample_size(self._format)
num_frames = int(len(frames) / (self._channels * width))
#print len(frames), self._channels, self._width, num_frames
pa.write_stream(self._stream, frames, num_frames,
exception_on_underflow)
stream_output = _portaudio.open(format = FORMAT,
channels = CHANNELS,
rate = RATE,
output = True,
frames_per_buffer = chunk)
print "* starting stream"
_portaudio.start_stream(stream_input)
_portaudio.start_stream(stream_output)
print "* recording"
for i in range(0, 44100 / chunk * RECORD_SECONDS):
data = _portaudio.read_stream(stream_input, chunk)
_portaudio.write_stream(stream_output, data, chunk)
print "* stopping stream"
_portaudio.stop_stream(stream_input)
_portaudio.stop_stream(stream_output)
print "* closing stream"
_portaudio.close(stream_input)
_portaudio.close(stream_output)
# match initialize() with terminate() calls
_portaudio.terminate()
print "* initializing"
_portaudio.initialize()
print "* opening"
stream = _portaudio.open(format = FORMAT,
channels = CHANNELS,
rate = RATE,
input = True,
output = True,
frames_per_buffer = chunk)
print "* starting stream"
_portaudio.start_stream(stream)
print "* recording"
for i in range(0, 44100 / chunk * RECORD_SECONDS):
data = _portaudio.read_stream(stream, chunk)
_portaudio.write_stream(stream, data, chunk)
print "* stopping stream"
_portaudio.stop_stream(stream)
print "* closing stream"
_portaudio.close(stream)
# match all initialize() with terminate() calls
_portaudio.terminate()
