Re: [Alsa-user] Roland AIRA TR-8 USB audio almost works with ALSA . . .

[Daniel M. <da...@zo...>]

On 07/07/2014 11:26 AM, David W. wrote:
> On 07/07/14 07:31, Clemens Ladisch wrote:

>> Apparently, this device needs some vendor-specific magic to enable
>> recording.
>>
> 
> Ah. Thanks for the info. It is an unconventional sound device . . .
> 
> Have any other USB audio devices that require vendor-specific magic for
> functionality been successfully made to work with ALSA (or rather has
> ALSA been patched to work with them)?

Tons of. Have a look at sound/usb/quirks.c

> I'm guessing a start would be to monitor the USB port in a Windows
> system between the device and the vendor's device driver.
> 
> Then to apply a patch to ALSA enabling the necessary signals - but
> perhaps that is beyond the remit of ALSA?

Exactly. You can use usbmon to trace USB packets under Linux, see
Documentation/usb/usbmon.txt. That also works when you boot Windows in a
VM such as VirtualBox.


Daniel