Hello, just wanted to let you know, that I get very low sound latencies (as measured with an oscilloscope) of 1-1.5 ms, when using wdm-ks drivers with the sounddevice module ( https://github.com/spatialaudio/python-sounddevice/ ) n = 42, mean = 1.2 ms, sd = 0.10 ms, min = 1,05 ms, max = 1.53 It is …

Sounds good if that’s working for you. I’d love to see something working well especially something that’s easier and more robust than pyo. And this supports Python3 which is a bonus too (pyo is one of the libs holding us back to py2) I can’t see the way that sounddevice accesses the wdm drivers - i…

yes, it uses portaudio; I thought, that the reason might be that portaudio is compiled in a different way (the portaudio.dll, which is bandled with sounddevice is quite smaller than the one with pyo), but I tried out pyo with this dll and there was a latency of 50ms as well, so it doesn’t have to do…

I’m the author of the sounddevice module and I wanted to say hi and confirm and clarify a few points. It indeed uses only PortAudio and there is nothing special done for any audio backend. Especially the Windows backends receive no special treatment, since I don’t even have a Windows computer. I p…

I just used the play function, when measuring sound latency with sounddevice. I’ll try it out with the OutputStream.write() method. I attached an oscilloscope to the computer and measured the delay between the sound onset and the trigger coming from the parallel port. Well, there are actually not m…

mhm… OutputStream.write() works with wasapi, but it doesn’t work with wdm-ks; sounddevice.PortAudioError: Error opening OutputStream: Unanticipated host API 4 error -9999: u’Blocking API not supported yet’ what would you recommend to play back the sound in that case? I just tested OutputStream.w…

I’ve also seen the problem that the beginning and/or the end of the sound are not played. I don’t know if that’s a PortAudio problem or a problem of the underlying audio drivers. This is yet another reason to start the stream in the beginning of the session, some time before the actual audio signals…

thanks, Matthias. I’ll try to do this. Actually we are playing back only white noise, so I even wouldn’t need to open a wave file, but just create the white noise in the callback function of portaudio in C, I think… that would be probably the most elegant solution 2016-08-28 18:28 GMT+02:00 matthia…

I’ve made some progress implementing a sounddevice backend for psychopy and it looks good. Let’s close this thread and move discussion to here: [image] What would it take to replace pyo? Development I’m just curious, because I’m not sure I would be able to find the time t…

Low sound latency with sounddevice module & wdm-ks driver

Development

jon November 22, 2016, 10:43pm 9

I’ve made some progress implementing a sounddevice backend for psychopy and it looks good. Let’s close this thread and move discussion to here:

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Low sound latency with sounddevice module & wdm-ks driver

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