Question

我正在尝试通过具有4个USB声卡的Raspberry Pi上的sounddevice模块进行输入输出对。我最多只能建立两个有线频道，但三个频道都无法使用。理想情况下，我想建立最多4通道的实时流（延迟并不重要。）

我使用了callback和with ：，似乎可以在两个通道上正常工作。请找到以下代码：


import sounddevice as sd

def wirecall(indata,outdata,*stuff):
    #sd.CallbackStop()
    outdata[:]=indata

with sd.Stream(device=0,channels=1,callback=wirecall,samplerate=44100):
    with sd.Stream(device=1, channels=1, callback=wirecall, samplerate=44100):
        while True:
                response=input()
                if response in ('', 'q', 'Q'):
                    break

这可以正常工作，但是只要我再添加一个：它就不起作用。这是Raspberry或Sounddevice模块的限制吗？我也尝试过PyAudio，但结果相同。

当我尝试打开以下3个流时，会出现错误消息。

>>> with sd.Stream(device=3,channels=1,callback=wirecall,samplerate=44100):
...     with sd.Stream(device=1,channels=1,callback=wirecall,samplerate=44100):
...         with sd.Stream(device=2, channels=1,callback=wirecall,samplerate=44100):
...             while True:
...                 response=input()
...                 if response in ('', 'q', 'Q'):
...                     break
...
Traceback (most recent call last):
  File "<stdin>", line 3, in <module>
  File "/home/pi/.local/lib/python2.7/site-packages/sounddevice.py", line 1662, in __init__
    **_remove_self(locals()))
  File "/home/pi/.local/lib/python2.7/site-packages/sounddevice.py", line 780, in __init__
    'Error opening {0}'.format(self.__class__.__name__))
  File "/home/pi/.local/lib/python2.7/site-packages/sounddevice.py", line 2570, in _check
    raise PortAudioError(errormsg, err, hosterror_info)
sounddevice.PortAudioError: Error opening Stream: Unanticipated host error [PaErrorCode -9999]: 'Broken pipe' [ALSA error -32]
>>>

声音设备的多输入输出通道接线

0 个答案: