FreeDATA/tnc/audio.py

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import json
####################################################
# https://stackoverflow.com/questions/7088672/pyaudio-working-but-spits-out-error-messages-each-time
# https://github.com/DJ2LS/FreeDATA/issues/22
# we need to have a look at this if we want to run this on Windows and MacOS !
# Currently it seems, this is a Linux-only problem
from ctypes import *
from contextlib import contextmanager
import pyaudio
ERROR_HANDLER_FUNC = CFUNCTYPE(None, c_char_p, c_int, c_char_p, c_int, c_char_p)
def py_error_handler(filename, line, function, err, fmt):
pass
c_error_handler = ERROR_HANDLER_FUNC(py_error_handler)
@contextmanager
def noalsaerr():
asound = cdll.LoadLibrary('libasound.so')
asound.snd_lib_error_set_handler(c_error_handler)
yield
asound.snd_lib_error_set_handler(None)
# with noalsaerr():
# p = pyaudio.PyAudio()
######################################################
def get_input_devices():
# UPDATE LIST OF AUDIO DEVICES
try:
# we need to "try" this, because sometimes libasound.so isn't in the default place
# try to supress error messages
with noalsaerr(): # https://github.com/DJ2LS/FreeDATA/issues/22
p = pyaudio.PyAudio()
# else do it the default way
except Exception as e:
p = pyaudio.PyAudio()
input_devices = []
output_devices = []
for i in range(0, p.get_device_count()):
# we need to do a try exception, beacuse for windows theres now audio device range
try:
maxInputChannels = p.get_device_info_by_host_api_device_index(0, i).get('maxInputChannels')
maxOutputChannels = p.get_device_info_by_host_api_device_index(0, i).get('maxOutputChannels')
name = p.get_device_info_by_host_api_device_index(0, i).get('name')
except:
maxInputChannels = 0
maxOutputChannels = 0
name = ''
if maxInputChannels > 0:
input_devices.append({"id": i, "name": str(name)})
if maxOutputChannels > 0:
output_devices.append({"id": i, "name": str(name)})
p.terminate()
return [input_devices, output_devices]
def get_output_devices():
pass