On Tue, Aug 19, 2014 at 2:15 PM, Daniel Mack <daniel@xxxxxxxxxx> wrote: > On 08/19/2014 02:01 AM, Xuebing Wang wrote: > >>>> root@imx6slevk:~# >>>> root@imx6slevk:~# arecord -f dat -t wav -D hw:2,0 | aplay -D hw:0,0 >>>> Recording WAVE 'stdin' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo >>>> Playing WAVE 'stdin' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo >>> Such a setup should work, I recently tried it myself. >>> >>> The other direction (capturing from host, playback on device), however, >>> has a major problem as the device interface has no timing mechanism, and >>> hence 'arecord | aplay' on the gadget side fails. I've prepared patches >>> and a more comprehensive description for this, but I'm waiting for >>> Andrzej's patches to be reviewed, as mine are based upon his. > Hmm... I tested 48KHz USB-IN without noise, 44.1KHz did show noise though ... iirc >> Thanks. You were trying UAC2, right? > > Yes. > However if used with defaults(i.e, 64KHz USB-OUT and 48KHz USB-IN) there should be no noise because samples divide up into frame nicely. >> Does it work with Windows 7/8 host? > > I have no idea, and no Windows box to test on. > IIRC Windows doesn't have native support for UAC2. -jassi -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
