USB 4 Mic Array. The ReSpeaker USB 4 Mic Array is the successor of the ReSpeaker USB 6+1 Mic Array. It has better built-in audio processing algorithms than the 6+1 Mic Array, so it has better audio recording quality, although it only has 4 microphones. I think it would be highly unusual for the libusbsetinterfacealtsetting call itself to cause the SIGSEGV. I would expect that either a prior call would cause this, or the SIGSEGV is an indirect effect of the call. That is, this call changes the alternate setting, which effectively starts the transfer of audio data.

Greetings everybody,

I have been trying to acquire data from my Sound Blaster audio device through USB
using libusb library.

Libusb.org Sound Cards & Media Devices Driver

Have been trying to implement isochronous communication mode and having an error
related to busy device, errno = 16.

While I was searching in the web, I see when asound.state file is running, similar
problems might arise.

I am not experienced that much in either Linux and libusb. That is why, wanted to
ask this in this forum.

If you could show me a way to solve my problem, I would be glad.

Thanks in advance

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It is almost certain that the kernel module/driver for the sound-card is in use. If Alsa is running, that would also be using the kernel module for the sound card. So something (either the driver or ALSA) is claiming ownership of the sound device and this is most likely stopping libusb from being able to access it - Giving you the 'device busy' error message. (BTW: I'm not sure ownership is the right term, but you get what I mean!)

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Why are you using libusb to get data from your sound card? Why not go through another API like ALSA or JACK?
This article might be of some help to you:
'>http://www.linuxdevcenter.com/pub/a/linux/2007/08/02/an-introduction-to-linux-audio.html

Libusb.org Sound Cards & Media Devices Driver

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