[alsa-devel] How to report error in _pointer function?

[Timur Tabi]

On Thu, Aug 7, 2008 at 11:29 AM, Takashi Iwai <tiwai at suse.de> wrote:

> How is the PCM status during hang?  Check
> /proc/asound/card0/pcm*/sub*/* files.

I wrote a script that repeatedly dumps the contents of
/proc/asound/card0/pcm0p/sub0/status.  I started playback, and it
shows this:

...
closed
closed
closed
state: OPEN
trigger_time: 0.000000000
tstamp      : 0.000000000
delay       : 0
avail       : 0
avail_max   : 0
-----
hw_ptr      : 0
appl_ptr    : 0
state: OPEN
trigger_time: 0.000000000
tstamp      : 0.000000000
delay       : 0
avail       : 0
avail_max   : 0
-----
hw_ptr      : 0
appl_ptr    : 0
state: XRUN
trigger_time: 165.300191122
tstamp      : 165.302136461
delay       : 0
avail       : 0
avail_max   : 0
-----
hw_ptr      : 0
appl_ptr    : 17840
state: XRUN
trigger_time: 165.300191122
tstamp      : 165.304661787
delay       : 0
avail       : 0
avail_max   : 0
-----
hw_ptr      : 0
appl_ptr    : 17840
state: XRUN
trigger_time: 165.300191122
tstamp      : 165.306860459
delay       : 0
avail       : 0
avail_max   : 0
-----
hw_ptr      : 0
appl_ptr    : 17840

and so on.

> Also, could you run with gdb and check at which code-path is it
> stopped?

Sorry, I don't use gdb that much.  How can I do this?  I don't think I
have debug versions of alsa-lib or mplayer.

-- 
Timur Tabi
Linux kernel developer at Freescale