hi Clemens:
2013/9/9 vichy vichy.kuo@gmail.com:
hi Clemens:
2013/9/9 Clemens Ladisch clemens@ladisch.de:
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:
- 108 of messages are the same and through away
- 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?
- 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,