exclusive mode for wasapi

[piotx]

Hello,

it's not an issue, but rather a question.

Is it possible to enable exclusive for wasapi?

best wishes
Piotr

[mgeier]

Not yet. But if you are willing to test it, I can try to implement it.

[piotx]

yes, I would love to test it. The wasapi exclusive mode is supposed to have
low latency and I would like to test this with an oscilloscope...

2016-08-16 19:47 GMT+02:00 Matthias Geier notifications@github.com:

Not yet. But if you are willing to test it, I can try to implement it.

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[mgeier]

Great! I'll implement this next week and let you know when there's something
to test.

[mgeier]

See also #4.

[mgeier]

@piotx I've implemented this in #39. Can you please check if it works?

[piotx]

I've installed the wasapi-settings branch, but get the following error,
when running wasapi_exclusive = sd.WasapiSettings(exclusive=True):

c:\python27\lib\site-packages\sounddevice-0.3.4-py2.7.egg\sounddevice.pyc
in **i
nit**(self, exclusive)
   2321         flags = 0x0
   2322         if exclusive:
-> 2323             flags |= paWinWasapiExclusive
   2324         self._streaminfo = _ffi.new('PaWasapiStreamInfo*', dict(
   2325             size=_ffi.sizeof('PaWasapiStreamInfo'),

NameError: global name 'paWinWasapiExclusive' is not defined

I have no experience with cffi and don't know how to fix it.

[mgeier]

Sorry, my bad!

I've updated the last commit, can you please try again?

[piotx]

so I got:

In [9]: sd.default.extra_settings = wasapi_exclusive
---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
<ipython-input-9-5cc895cc08f4> in <module>()
----> 1 sd.default.extra_settings = wasapi_exclusive

c:\python27\lib\site-packages\sounddevice-0.3.4-py2.7.egg\sounddevice.pyc in __s
etattr__(self, name, value)
   2175     def __setattr__(self, name, value):
   2176         """Only allow setting existing attributes."""
-> 2177         if name in _pairs:
   2178             getattr(self, name)._pair[:] = _split(value)
   2179         elif name in dir(self) and name != 'reset':

NameError: global name '_pairs' is not defined

[mgeier]

Silly me. I made another mistake. Can you try again, please?

[piotx]

mhm.. I tried also to change _pairs to self._pairs but the first error is
still there..

  File "wasapi_test.py", line 9, in <module>
    sd.play(data, fs, device = 9)
  File
"C:\Python27\lib\site-packages\sounddevice-0.3.4-py2.7.egg\sounddevice.py
", line 387, in play
    *_kwargs)
  File
"C:\Python27\lib\site-packages\sounddevice-0.3.4-py2.7.egg\sounddevice.py
", line 2461, in start_stream
    *_kwargs)
  File
"C:\Python27\lib\site-packages\sounddevice-0.3.4-py2.7.egg\sounddevice.py
", line 1540, in **init**
    prime_output_buffers_using_stream_callback)
  File
"C:\Python27\lib\site-packages\sounddevice-0.3.4-py2.7.egg\sounddevice.py
", line 911, in **init**
    'Error opening {0}'.format(self.**class**.**name**))
  File
"C:\Python27\lib\site-packages\sounddevice-0.3.4-py2.7.egg\sounddevice.py
", line 2598, in _check
    raise PortAudioError(msg)
sounddevice.PortAudioError: Error opening OutputStream: Incompatible hostAPI specific stream info

[piotx]

but actually wasapi just doesn't work anymore at all. I had this behavior before, but I really don't understand it; no idea, why. I'll test it on the pc