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https://github.com/DJ2LS/FreeDATA
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70 lines
2 KiB
Python
70 lines
2 KiB
Python
"""
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Gather information about audio devices.
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"""
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import atexit
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import multiprocessing
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import sounddevice as sd
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atexit.register(sd._terminate)
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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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# we need to reset and initialize sounddevice before running the multiprocessing part.
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# If we are not doing this at this early point, not all devices will be displayed
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sd._terminate()
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sd._initialize()
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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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proc = multiprocessing.Process(
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target=fetch_audio_devices, args=(proxy_input_devices, proxy_output_devices)
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)
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proc.start()
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proc.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 output devices
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Returns:
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"""
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devices = sd.query_devices(device=None, kind=None)
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for index, device in enumerate(devices):
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# Use a try/except block beacuse Windows doesn't have an audio device range
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try:
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name = device["name"]
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max_output_channels = device["max_output_channels"]
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max_input_channels = device["max_input_channels"]
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except Exception as err:
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print(err)
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max_input_channels = 0
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max_output_channels = 0
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name = ""
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if max_input_channels > 0:
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input_devices.append({"id": index, "name": name})
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if max_output_channels > 0:
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output_devices.append({"id": index, "name": name})
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