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@xxxxxxxxxxxxxxxxx>:
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@xxxxxxx>:
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@xxxxxxx>:
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@xxxxxxx>:
> On Fri, 22 Jun 2018 20:36:12 +0200,
> Harald Schuster wrote:
>>
>>
>> Zitat von Takashi Iwai <tiwai@xxxxxxx>:
>>
>> > 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@xxxxxxxxxxxxxxxx
>> > 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
> _______________________________________________
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> Alsa-devel@xxxxxxxxxxxxxxxx
> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
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