On Mon, 7 Jul 2014, Daniel Mack wrote: > 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? No, it is not beyond the remit of ALSA. As pointed out, "tons" of usb cards have had their special quirks analysed and included in 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. > It would clearly help the usb maintainers to know exactly what special commands are needed to make the devices work, since they are unlikely to own a copy of every single usb sound card. Either that or having the manufacturers send them a copy of their sound cards ( or even better, telling the alsa developers what is needed). But manufacturers tend to extremely anally retantive as far as such information is concerned. I recall asking Maudio for the name of the windows file which contained the firmware which needed to be loaded onto one of their usb cards to make it work, and they claimed that the name of the file was proprietary information. > ------------------------------------------------------------------------------ Open source business process management suite built on Java and Eclipse Turn processes into business applications with Bonita BPM Community Edition Quickly connect people, data, and systems into organized workflows Winner of BOSSIE, CODIE, OW2 and Gartner awards http://p.sf.net/sfu/Bonitasoft _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
