mirror of
https://github.com/DJ2LS/FreeDATA
synced 2024-05-14 08:04:33 +00:00
125 lines
3.6 KiB
Python
125 lines
3.6 KiB
Python
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import json
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import sys
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import multiprocessing
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import sounddevice as sd
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'''
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####################################################
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# https://stackoverflow.com/questions/7088672/pyaudio-working-but-spits-out-error-messages-each-time
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# https://github.com/DJ2LS/FreeDATA/issues/22
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# we need to have a look at this if we want to run this on Windows and MacOS !
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# Currently it seems, this is a Linux-only problem
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from ctypes import *
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from contextlib import contextmanager
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import pyaudio
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ERROR_HANDLER_FUNC = CFUNCTYPE(None, c_char_p, c_int, c_char_p, c_int, c_char_p)
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def py_error_handler(filename, line, function, err, fmt):
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"""
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Args:
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filename:
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line:
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function:
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err:
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fmt:
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Returns:
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"""
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pass
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c_error_handler = ERROR_HANDLER_FUNC(py_error_handler)
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@contextmanager
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def noalsaerr():
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""" """
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asound = cdll.LoadLibrary('libasound.so')
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asound.snd_lib_error_set_handler(c_error_handler)
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yield
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asound.snd_lib_error_set_handler(None)
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# with noalsaerr():
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# p = pyaudio.PyAudio()
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'''
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#####################################################
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def get_audio_devices():
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"""
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return list of input and output audio devices in own process to avoid crashes of portaudio on raspberry pi
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also uses a process data manager
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"""
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# we need to run this on windows for multiprocessing support
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# multiprocessing.freeze_support()
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#multiprocessing.get_context('spawn')
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with multiprocessing.Manager() as manager:
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proxy_input_devices = manager.list()
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proxy_output_devices = manager.list()
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#print(multiprocessing.get_start_method())
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p = multiprocessing.Process(target=fetch_audio_devices, args=(proxy_input_devices, proxy_output_devices))
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p.start()
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p.join()
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return list(proxy_input_devices), list(proxy_output_devices)
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def fetch_audio_devices(input_devices, output_devices):
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"""
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get audio devices from portaudio
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Args:
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input_devices: proxy variable for input devices
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output_devices: proxy variable for outout devices
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Returns:
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"""
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'''
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# UPDATE LIST OF AUDIO DEVICES
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try:
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# we need to "try" this, because sometimes libasound.so isn't in the default place
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# try to supress error messages
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with noalsaerr(): # https://github.com/DJ2LS/FreeDATA/issues/22
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p = pyaudio.PyAudio()
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# else do it the default way
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except Exception as e:
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p = pyaudio.PyAudio()
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#input_devices = []
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#output_devices = []
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'''
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sd._terminate()
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sd._initialize()
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devices = sd.query_devices(device=None, kind=None)
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index = 0
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for device in devices:
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#for i in range(0, p.get_device_count()):
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# we need to do a try exception, beacuse for windows theres no audio device range
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try:
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#maxInputChannels = p.get_device_info_by_host_api_device_index(0, i).get('maxInputChannels')
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#maxOutputChannels = p.get_device_info_by_host_api_device_index(0, i).get('maxOutputChannels')
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#name = p.get_device_info_by_host_api_device_index(0, i).get('name')
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name = device["name"]
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maxOutputChannels = device["max_output_channels"]
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maxInputChannels = device["max_input_channels"]
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except:
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maxInputChannels = 0
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maxOutputChannels = 0
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name = ''
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if maxInputChannels > 0:
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input_devices.append({"id": index, "name": str(name)})
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if maxOutputChannels > 0:
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output_devices.append({"id": index, "name": str(name)})
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index += 1
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