hi Clemens: 2013/9/9 vichy <vichy.kuo@xxxxxxxxx>: > hi Clemens: > > 2013/9/9 Clemens Ladisch <clemens@xxxxxxxxxx>: >> vichy wrote: >>> I try to do webcam audio capture on my arm platform. >>> when I execute audio capture I got below message >>> "retire_capture_urb: 108 callbacks suppressed" >> >> This means that the retire_capture_urb() function printed lots of >> messages, and that 108 of them were thrown away because they were >> identical. > Does that mean: > 1. 108 of messages are the same and through away > 2. alsa get data from uac device through Host controller driver 108 > times and find they are the same and through away > >>You have to look at the previous line to get the actual >> message. > I try to grep -rwn '"retire_capture_urb.*' sound/usb/*, but get nothing. > Would you please tell me what the "previous line to get the actual > message" you mean? > >> >>> 2. from usb mon log, it seems HW keep Active status high even until >>> ehci_io_watchdog happen, because the ep status is -EXDEV. >> >> How are you trying to capture data? > I use the capture function in tinyalsa. forget to say, the command I execute is tinycap record.wav -D 0 -d 0 -c 2 -r 32000 > > BTW, If I want to use number of urbs I expected and only send/complete > only 1 round, where I can find the source code to modify? it seems ep->nurbs in snd_usb_endpoint_start is what I expected, right? > > Thanks for your great help, -- 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
