[alsa-devel] poll blocked after prepare state

Takashi Iwai tiwai at suse.de
Wed Jul 11 09:31:32 CEST 2018 

On Wed, 11 Jul 2018 09:27:27 +0200,
Harald Schuster wrote:
> 
> Hi
> So I found out that the problem only occours when the dshare Plugin is
> used! When the normal hw is used the problem does not exist. Is there
> any knwon problem with the dshare plugin that the playback stops or is
> there a workaraund?

Let me ask again like a broken record: did you check with the latest
alsa-lib?

And, please don't top-post unless you have to do so.


thanks,

Takashi


> br Harald
> 
> Zitat von Harald Schuster <schuster at technikum-wien.at>:
> 
> > Hi
> > I found out that the error occours when the snd_pcm_read_areas
> > function is called in a special order. When the function
> > snd_pcm_read_areas is not called or it is called between the
> > snd_pcm_dshare_starts it works fine. The Codec is already running
> > because the mic path is working fine.
> >
> > pb_thread_func (alsa_dev.c): Underrun
> > snd_pcm_read_areas(pcm.c): Before snd_pcm_start()
> > snd_pcm_generic_start(pcm_generic.c):
> > snd_pcm_hw_start
> > snd_pcm_hw_start
> > pb_thread_func (alsa_dev.c): Underrun 0x74395c80
> > snd_pcm_write_areas(pcm.c): Before snd_pcm_start()
> > snd_pcm_dshare_start
> > snd_pcm_write_areas(pcm.c): Before snd_pcm_start()
> > snd_pcm_dshare_start
> > snd_pcm_write_areas(pcm.c): Before snd_pcm_start()
> > snd_pcm_dshare_start
> > snd_pcm_write_areas(pcm.c): Before snd_pcm_start()
> > snd_pcm_dshare_start
> >
> >
> >
> > Zitat von Harald Schuster <schuster at technikum-wien.at>:
> >
> >> We found out that in some cases after the underrun the
> >> snd_pcm_dshare_start function is called and in some cases
> >> snd_pcm_dshare_start and the snd_pcm_hw_start function is called.
> >> When both functions are called the codec stops playback.
> >>
> >> Zitat von Takashi Iwai <tiwai at suse.de>:
> >>
> >>> On Mon, 25 Jun 2018 15:43:15 +0200,
> >>> Harald Schuster wrote:
> >>>>
> >>>> Hi
> >>>> The codec is the TI tlv320aic3x and the buffersize is set to 64 and
> >>>> the periodsize is set to 32 in the asound.conf. We use the pjProject
> >>>> for the audioprocessing and the internal period time is 4ms and the
> >>>> sample rate is 8000 Hz. The second codec is a USB codec which has no
> >>>> problems. Our scenario is that a incoming VOIP call is connected to
> >>>> the both codec (I2s and USB) and the USB codec starts the playback
> >>>> without any problems and the tlv320 sometimes works but when a
> >>>> underrun accours it crash!
> >>>
> >>> Is it really so hardware-specific problem?
> >>>
> >>> And, did you follow the recent development / fixes if it's about
> >>> dshare plugin?  There have been lots of changes.
> >>>
> >>> I'm not asking about updating the kernels.  The question is rather
> >>> about alsa-lib.
> >>>
> >>>
> >>> Takashi
> >>>
> >>>>
> >>>> best regards Harald
> >>>>
> >>>>
> >>>> Zitat von Takashi Iwai <tiwai at suse.de>:
> >>>>
> >>>>> On Mon, 25 Jun 2018 11:59:02 +0200,
> >>>>> Harald Schuster wrote:
> >>>>>>
> >>>>>>
> >>>>>> Hi
> >>>>>> We are not able to update our system. We are using USB codecs which
> >>>>>> are working fine but they are using the snd_pcm_hw_prepare function.
> >>>>>> The Problem only exists for the I2S codec in our system. When i
> >>>>>> changed the buffer size in the asound.conf for the codec the problem
> >>>>>> allready exists but it arise not so often because there is not so
> >>>>>> often a underrun. Is there any hint where i could lock for the
> >>>>>> problem?!
> >>>>>
> >>>>> Well, with that little information, it's hard to advice anything...
> >>>>>
> >>>>>
> >>>>> Takashi
> >>>>>
> >>>>>> br Harald
> >>>>>>
> >>>>>> Zitat von Takashi Iwai <tiwai at suse.de>:
> >>>>>>
> >>>>>>> On Fri, 22 Jun 2018 20:36:12 +0200,
> >>>>>>> Harald Schuster wrote:
> >>>>>>>>
> >>>>>>>>
> >>>>>>>> Zitat von Takashi Iwai <tiwai at suse.de>:
> >>>>>>>>
> >>>>>>>> > On Fri, 22 Jun 2018 15:29:21 +0200,
> >>>>>>>> > Harald Schuster wrote:
> >>>>>>>> >>
> >>>>>>>> >> I found out that an underrun occours and so the
> >>>>>>>> pcm_prepare function
> >>>>>>>> >> for pcm_direct is called and then pcm_start_dshare is called. Both
> >>>>>>>> >> functions returns without any error but the playback path
> >>>>>>>> is blocked
> >>>>>>>> >> in the snd_pcm_wait_nocheck function. I read that there
> >>>>>>>> was an similar
> >>>>>>>> >> problem before in the group but i didn't found any
> >>>>>>>> solution. Is this a
> >>>>>>>> >> problem in the driver and how can i go forward to fix it.
> >>>>>>>> The codec is
> >>>>>>>> >> a tlv320aic3x-audio. Thanks for your help.
> >>>>>>>> >
> >>>>>>>> > Does this happen with the very latest alsa-lib git version?
> >>>>>>>> > Just to be sure.
> >>>>>>>> >
> >>>>>>>> >
> >>>>>>>> > Takashi
> >>>>>>>> > _______________________________________________
> >>>>>>>> > Alsa-devel mailing list
> >>>>>>>> > Alsa-devel at alsa-project.org
> >>>>>>>> > http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
> >>>>>>>>
> >>>>>>>> Hi
> >>>>>>>> We are using k4.1.15-6QP+ga2066af.
> >>>>>>>
> >>>>>>> I'm asking the alsa-lib, not kernel.
> >>>>>>>
> >>>>>>> And 4.1.x is very old...  Please check either 4.17.x or latest Linus
> >>>>>>> tree whether the problem persists, too.
> >>>>>>>
> >>>>>>>
> >>>>>>> Takashi
> >>>>>>> _______________________________________________
> >>>>>>> Alsa-devel mailing list
> >>>>>>> Alsa-devel at alsa-project.org
> >>>>>>> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>> _______________________________________________
> >>>>>> Alsa-devel mailing list
> >>>>>> Alsa-devel at alsa-project.org
> >>>>>> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
> >>>>>>
> >>>>> _______________________________________________
> >>>>> Alsa-devel mailing list
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> >>>>> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
> >>>>
> >>>>
> >>>>
> >>>> _______________________________________________
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> >>>>
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> >>
> >>
> >>
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> >
> >
> >
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