[alsa-devel] ALSA error : frame 0 active: -75
irfan.shaikh at sasken.com
Fri Nov 12 11:00:59 CET 2010
Increase the size of your Capture Buffer in capture device (USB audio class)
I guess this would help you in solving the Overrun problem
From: alsa-devel-bounces at alsa-project.org [alsa-devel-bounces at alsa-project.org] On Behalf Of Rajul Kumar [rajul.manit1 at gmail.com]
Sent: Friday, November 12, 2010 2:32 PM
To: Clemens Ladisch
Cc: tiwai at suse.de; alsa-devel at alsa-project.org
Subject: Re: [alsa-devel] ALSA error : frame 0 active: -75
Thanx for the reply .
i have a few more queries . please find time to guide regarding these .
is it possible to have some software solution from audio class driver
for -EOVERFLOW condition ?
As depicted from error-codes.txt , -EOVERFLOW can be indicative of
hardware problem also .
Can we be suggested how we can make sure that problem lies in the hardware only
( i mean via some code in usb stack or anything else ) .
Are there some mandatory H/W requirements for iso transfer usb signal
which may not be required for bulk or other transfers ,
without which iso transfers can report H/W errors anytime ?
how can usb signal be improved so as to perfectly support iso transfers ?
Thanx & Regards
On Fri, Nov 12, 2010 at 2:16 PM, Clemens Ladisch <clemens at ladisch.de> wrote:
> Rajul Kumar wrote:
>> ALSA sound/usb/usbaudio.c:354: frame 0 active: -75
> -75 = -EOVERFLOW
>> which is followed by coninous loop of below messages :
>> ALSA sound/usb/usbaudio.c:354: frame 0 active: -71
> -71 = -EPROTO
>> ALSA sound/usb/usbaudio.c:354: frame 0 active: -18
> -18 = -EXDEV
> Documentation/usb/error-codes.txt says:
> | -EOVERFLOW (*) The amount of data returned by the endpoint was
> | greater than either the max packet size of the
> | endpoint or the remaining buffer size. "Babble".
> | -EPROTO (*, **) a) bitstuff error
> | b) no response packet received within the
> | prescribed bus turn-around time
> | c) unknown USB error
> | -EXDEV ISO transfer only partially completed
> | look at individual frame status for details
> | (*) Error codes like -EPROTO, -EILSEQ and -EOVERFLOW normally indicate
> | hardware problems such as bad devices (including firmware) or cables.
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