[alsa-devel] Overrun Errors - SAM9G

[Akshay Mishra]

On 17 July 2014 18:24, Akshay Mishra <akshaymishra at gmail.com> wrote:

> Hello,
>     I am trying a simple alsa capture on the Atmel ARM9 (SAM9G45). While
> only capture runs fine, putting any os call on the same thread gives XRUNs.
>
> Even a innocent usleep(1) seems to lead to regular XRUNs. Eventually I
> want to dump this capture on the serial port and I am not able to get past
> this.
>
>
running pulseaudio gives me the following. I am not sure if this is related.

 snd_pcm_avail() returned a value that is exceptionally large: 414168 bytes
(2347 ms).
E: [alsa-sink] alsa-util.c: Most likely this is a bug in the ALSA driver
'(null)'. Please report this issue to the ALSA developers.
E: [alsa-sink] alsa-util.c: snd_pcm_dump():
E: [alsa-sink] alsa-util.c: Hardware PCM card 0 'Atmel AC97C' device 0
subdevice 0
E: [alsa-sink] alsa-util.c: Its setup is:
E: [alsa-sink] alsa-util.c:   stream       : PLAYBACK
E: [alsa-sink] alsa-util.c:   access       : MMAP_INTERLEAVED
E: [alsa-sink] alsa-util.c:   format       : S16_LE
E: [alsa-sink] alsa-util.c:   subformat    : STD
E: [alsa-sink] alsa-util.c:   channels     : 2
E: [alsa-sink] alsa-util.c:   rate         : 44100
E: [alsa-sink] alsa-util.c:   exact rate   : 44100 (44100/1)
E: [alsa-sink] alsa-util.c:   msbits       : 16
E: [alsa-sink] alsa-util.c:   buffer_size  : 8640
E: [alsa-sink] alsa-util.c:   period_size  : 1440
E: [alsa-sink] alsa-util.c:   period_time  : 32653
E: [alsa-sink] alsa-util.c:   tstamp_mode  : ENABLE
E: [alsa-sink] alsa-util.c:   period_step  : 1
E: [alsa-sink] alsa-util.c:   avail_min    : 7759
E: [alsa-sink] alsa-util.c:   period_event : 0
E: [alsa-sink] alsa-util.c:   start_threshold  : -1
E: [alsa-sink] alsa-util.c:   stop_threshold   : 1132462080
E: [alsa-sink] alsa-util.c:   silence_threshold: 0
E: [alsa-sink] alsa-util.c:   silence_size : 0
E: [alsa-sink] alsa-util.c:   boundary     : 1132462080
E: [alsa-sink] alsa-util.c:   appl_ptr     : 396378
E: [alsa-sink] alsa-util.c:   hw_ptr       : 491280






> I have tried on AT91 linux as well as on kernel 3.10.10-rt7 with no
> success.
>
> Please advice,
> Akshay
>
>