python - How can I stream a NumPy array into a stream? -

i trying realtime player/recorder looper. i´m starting , dealing win pyaudio.

at moment, able create stream , store in numpy array, not able send pyaudio stream when want.

i want use arrays because prefer store in memory until want save wave files.

note try play matth´s python-sounddevice, i'm not able play it. can't find way achieve this.

here´s current code:

import sys import pyaudio import numpy np import sounddevice sd  p = pyaudio.pyaudio() datos_numpy=np.array([]) chunk=64 channels=2 format=pyaudio.pafloat32 rate=44100  is_recording=false is_playing=false  def callback(in_data, frame_count, time_info, status):     global datos_numpy, is_playing, is_recording     if is_recording==true:         if in_data:             print 'recording'             temp_data=np.fromstring(in_data, dtype=np.float32)             datos_numpy = np.append(datos_numpy,temp_data)         else:             print('no input')          return in_data, pyaudio.pacontinue      elif is_playing==true:             print 'playing'             #out_data= ???? here problem             #return out_data, pyaudio.pacontinue        else:         return in_data, pyaudio.pacontinue   stream = p.open(format=pyaudio.pafloat32,                 channels=channels,                 rate=rate,                 output=true,                 input=true,                 input_device_index=6,                 output_device_index=14,                 frames_per_buffer=chunk,                 stream_callback=callback)  def record():     global is_playing, is_recording     is_recording=true     is_playing=false   def play():     global is_playing, is_recording, datos_numpy     is_recording=false     is_playing=true     sd.play(datos_numpy, 44100) 

since getting numpy array fromstring method, may able toget string buffer numpy.tostring() method.

alternatively, instead of converting numpy array, can pickle string buffer hard disk. not have worry how working buffer back.