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Identify different instances of same device
See original GitHub issueI am using several USB audio interfaces through a USB hub, but every time I turn on or re-plug it, it seems like the device Ids and their order changes. Is it possible to map the device to its physical location using sounddevice?
For example, I have this:
>>> sd.query_devices()
0 USB PnP Sound Device: Audio (hw:0,0), ALSA (1 in, 2 out)
1 USB PnP Sound Device: Audio (hw:1,0), ALSA (1 in, 2 out)
2 bcm2835 ALSA: IEC958/HDMI (hw:2,1), ALSA (0 in, 8 out)
3 bcm2835 ALSA: IEC958/HDMI1 (hw:2,2), ALSA (0 in, 8 out)
4 USB PnP Sound Device: Audio (hw:3,0), ALSA (1 in, 2 out)
5 USB PnP Sound Device: Audio (hw:4,0), ALSA (1 in, 2 out)
6 sysdefault, ALSA (128 in, 128 out)
7 front, ALSA (0 in, 2 out)
8 surround40, ALSA (0 in, 2 out)
9 iec958, ALSA (0 in, 2 out)
10 spdif, ALSA (1 in, 2 out)
* 11 default, ALSA (128 in, 128 out)
12 dmix, ALSA (0 in, 2 out)
and from the terminal I can find the physical connection for each USB dongle:
$ lsusb -t
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=dwc_otg/1p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/5p, 480M
|__ Port 1: Dev 3, If 0, Class=Vendor Specific Class, Driver=smsc95xx, 480M
|__ Port 2: Dev 9, If 0, Class=Hub, Driver=hub/4p, 480M
|__ Port 3: Dev 12, If 2, Class=Audio, Driver=snd-usb-audio, 12M
|__ Port 3: Dev 12, If 0, Class=Audio, Driver=snd-usb-audio, 12M
|__ Port 3: Dev 12, If 3, Class=Human Interface Device, Driver=usbhid, 12M
|__ Port 3: Dev 12, If 1, Class=Audio, Driver=snd-usb-audio, 12M
|__ Port 1: Dev 10, If 3, Class=Human Interface Device, Driver=usbhid, 12M
|__ Port 1: Dev 10, If 1, Class=Audio, Driver=snd-usb-audio, 12M
|__ Port 1: Dev 10, If 2, Class=Audio, Driver=snd-usb-audio, 12M
|__ Port 1: Dev 10, If 0, Class=Audio, Driver=snd-usb-audio, 12M
|__ Port 4: Dev 13, If 1, Class=Audio, Driver=snd-usb-audio, 12M
|__ Port 4: Dev 13, If 2, Class=Audio, Driver=snd-usb-audio, 12M
|__ Port 4: Dev 13, If 0, Class=Audio, Driver=snd-usb-audio, 12M
|__ Port 4: Dev 13, If 3, Class=Human Interface Device, Driver=usbhid, 12M
|__ Port 2: Dev 11, If 2, Class=Audio, Driver=snd-usb-audio, 12M
|__ Port 2: Dev 11, If 0, Class=Audio, Driver=snd-usb-audio, 12M
|__ Port 2: Dev 11, If 3, Class=Human Interface Device, Driver=usbhid, 12M
|__ Port 2: Dev 11, If 1, Class=Audio, Driver=snd-usb-audio, 12M
Issue Analytics
- State:
- Created 4 years ago
- Comments:6 (4 by maintainers)
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Thanks for your reply. I just send a message to their mailing list. I hope to get some hints from there. I’ll post back if I found any solution.
I think this is a known issue of PortAudio (and there may be work in progress for fixing this?). You should ask at their mailing list: http://portaudio.com/contacts.html.
The
sounddevicemodule just gets the list of devices from PortAudio, there is nothing we can make on the Python side …