howto stream numpy array into pyaudio stream?

Question

I'm writing a code that supposed to give some audio output to the user based on his action, and I want to generate the sound rather than having a fixed number of wav files to play. Now, what I'm doing is to generate the signal in numpy format, store the data in a wav file and then read the same file into pyaudio. I think this is redundant, however, I couldn't find a way to do that. My question is, can I stream a numpy array (or a regular list) directly into my the pyaudio to play?

Answer 1

If its just playback and does not need to be synchronised to anything then you can just do the following:

# Open stream with correct settings
stream = self.p.open(format=pyaudio.paFloat32,
                         channels=CHANNELS,
                         rate=48000,
                         output=True,
                         output_device_index=1
                         )
# Assuming you have a numpy array called samples
data = samples.astype(np.float32).tostring()
stream.write(data)

I use this method and it works fine for me. If you need to record at the same time then this won't work.