FreeDATA/tnc/audio.py
2022-04-11 11:10:32 +02:00

73 lines
2.1 KiB
Python

import json
import sys
import multiprocessing
import sounddevice as sd
import atexit
atexit.register(sd._terminate)
def get_audio_devices():
"""
return list of input and output audio devices in own process to avoid crashes of portaudio on raspberry pi
also uses a process data manager
"""
# we need to run this on windows for multiprocessing support
# multiprocessing.freeze_support()
#multiprocessing.get_context('spawn')
# we need to reset and initialize sounddevice before running the multiprocessing part.
# If we are not doing this at this early point, not all devices will be displayed
sd._terminate()
sd._initialize()
with multiprocessing.Manager() as manager:
proxy_input_devices = manager.list()
proxy_output_devices = manager.list()
#print(multiprocessing.get_start_method())
p = multiprocessing.Process(target=fetch_audio_devices, args=(proxy_input_devices, proxy_output_devices))
p.start()
p.join()
return list(proxy_input_devices), list(proxy_output_devices)
def fetch_audio_devices(input_devices, output_devices):
"""
get audio devices from portaudio
Args:
input_devices: proxy variable for input devices
output_devices: proxy variable for outout devices
Returns:
"""
devices = sd.query_devices(device=None, kind=None)
index = 0
for device in devices:
#for i in range(0, p.get_device_count()):
# we need to do a try exception, beacuse for windows theres no audio device range
try:
name = device["name"]
maxOutputChannels = device["max_output_channels"]
maxInputChannels = device["max_input_channels"]
except Exception as e:
print(e)
maxInputChannels = 0
maxOutputChannels = 0
name = ''
if maxInputChannels > 0:
input_devices.append({"id": index, "name": str(name)})
if maxOutputChannels > 0:
output_devices.append({"id": index, "name": str(name)})
index += 1