Re: snd_pcm_wait returning EPIPE

[Takashi Iwai <tiwai@suse.de>]

At Thu, 7 Oct 2004 11:26:34 -0400,
Glenn Maynard wrote:
> 
> I've disabled the underrun state, eg. setting
> snd_pcm_sw_params_set_stop_threshold to dsnd_pcm_sw_params_get_boundary,
> which results in EPIPE never being returned from snd_pcm_wait (as I wanted),
> so I can handle underruns myself.  I'm opening hw:0 directly, to avoid
> resampling.
> 
> However, I'm receiving a report of a system returning EPIPE:
> 
> https://sourceforge.net/tracker/index.php?func=detail&aid=1035604&group_id=37892&atid=421366
> https://sourceforge.net/tracker/download.php?group_id=37892&atid=421366&file_id=103978&aid=1035604
> 
> This is apparently on an x86-64 system.
> 
> Is this a known problem?  Am I probably doing something wrong that just
> happens to usually work?  I'm treating EPIPE as an unexpected condition,
> since it's not clear why it would happen here; should I have it call
> snd_pcm_prepare() and retry anyway?

-EPIPE is usually buffer over/underrun (XRUN), so apps are supposed to
call snd_pcm_prepare() after receiving this.


Takashi


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