I have a raspberry with a usb mic. I want to stream realtime the mic input to the 3.5mm output.
Is this possible?
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Yes I think it is possible, for example you can use FIFO file:
~$ mkfifo /tmp/input.audio.fifo
Write a python programm like this (warning, this script record only 60sec of audio, you can adjust this): Python code REF.
To install: python -m pip install pyaudio
"""PyAudio example: Record a few seconds of audio and save to a WAVE file.""" import pyaudio import wave CHUNK = 1024 FORMAT = pyaudio.paInt16 CHANNELS = 2 RATE = 44100 RECORD_SECONDS = 60 WAVE_OUTPUT_FILENAME = "/tmp/input.audio.fifo" p = pyaudio.PyAudio() stream = p.open(format=FORMAT, channels=CHANNELS, rate=RATE, input=True, frames_per_buffer=CHUNK) print("* recording") frames =  for i in range(0, int(RATE / CHUNK * RECORD_SECONDS)): data = stream.read(CHUNK) frames.append(data) print("* done recording") stream.stop_stream() stream.close() p.terminate() wf = wave.open(WAVE_OUTPUT_FILENAME, 'wb') wf.setnchannels(CHANNELS) wf.setsampwidth(p.get_sample_size(FORMAT)) wf.setframerate(RATE) wf.writeframes(b''.join(frames)) wf.close()
And configure the RPi audio for Jack output not HDMI then use aplay for reading the fifo file for getting your audio output (in another terminal), :
~$ aplay /tmp/input.audio.fifo
let me know if it works because I have not tried. Good luck.
arecord /tmp/input.audio.fifoinstance of the python script.