[alsa-devel] dmix problems with analog out (HDMI out works fine with dmix)

[Robert Krakora]

On Thu, Sep 29, 2011 at 8:43 AM, Robert Krakora <
rob.krakora at messagenetsystems.com> wrote:

>
>
> On Thu, Sep 29, 2011 at 8:32 AM, Takashi Iwai <tiwai at suse.de> wrote:
>
>> At Thu, 29 Sep 2011 08:22:39 -0400,
>> Robert Krakora wrote:
>> >
>> > On Thu, Sep 29, 2011 at 2:36 AM, Takashi Iwai <tiwai at suse.de> wrote:
>> >
>> > > At Wed, 28 Sep 2011 12:29:05 -0400,
>> > > Robert Krakora wrote:
>> > > >
>> > > > Hi All,
>> > > >
>> > > > I am using ALSA 1.0.24 with the attached asound.conf.  I am
>> attempting to
>> > > > share (mix) the analog output between Asterisk and aplay.  However,
>> when
>> > > > Asterisk is running, my application throws an error when attempting
>> to
>> > > play
>> > > > a wave file via aplay.  If I stop Asterisk, aplay plays the wave
>> file
>> > > just
>> > > > fine.  If I remove the asound.conf file, Asterisk and aplay are both
>> > > happy
>> > > > and share the analog output just find with the default ALSA dmix
>> > > > implementation.  However, we need this asound.conf to work for us
>> for
>> > > other
>> > > > reasons.  What is wrong with it.  I have even tried replacing dmix
>> with
>> > > > dshare and get the same bad behavior.  We are running CentOS 6.0.
>>  As a
>> > > > caveat, I am attempting to use dmix with analog audio.  If I use it
>> with
>> > > > HDMI audio, it works flawlessly (same asound.conf with tweek to
>> specify
>> > > > HDMI).  Thanks in advance for your help.
>> > > >
>> > > > [root at devkrakorar snd]# su silentm -c "aplay -Dplug:dmixer
>> > > > /usr/share/sounds/alsa/Front_
>> > > > Center.wav"
>> > > > ALSA lib pcm_hw.c:1293:(snd_pcm_hw_open) open '/dev/snd/pcmC0D0p'
>> failed
>> > > > (-22): Invalid argument
>> > > >
>> > > > ALSA lib pcm_dmix.c:1068:(snd_pcm_dmix_open) unable to open slave
>> > > > aplay: main:660: audio open error: Invalid argument
>> > > > [root at devkrakorar snd]#
>> > >
>> > > Looks like the open of HD-audio stream failed by some reason.
>> > > When you open via aplay, is the corresponding stream already opened
>> > > by another?  Take a look at /proc/asound/card0/pcm0p/sub0/* files.
>> > >
>> > > Also, try the latest alsa-driver snapshot in
>> > >   ftp://ftp.suse.com/pub/people/tiwai/snapshot/
>> > >
>> > >
>> > > Takashi
>> > >
>> >
>> > Hi Takashi,
>> >
>> > Thanks for the quick response.  Yes, the HD-audio stream open fails
>> because
>> > Asterisk has previously opened it.  aplay cannot open it (error -22).
>>
>> -22 is -EINVAL, and it's not -EBUSY or -EAGAIN.  If a blocking open is
>> the problem, it should have been -EAGAIN or such.
>> That is, usually something conflicts with the opened stream.
>>
>>
>> Takashi
>>
>
> Hi Takashi,
>
> You are the man!  Your latest drivers have eliminated this issue!  What did
> you have to change to fix this?
>
>
> Best Regards,
>
> --
> Rob Krakora
> MessageNet Systems
> 101 East Carmel Dr. Suite 105
> Carmel, IN 46032
> (317)566-1677 Ext 212
> (317)663-0808 Fax
>

Hi Takashi,

So, are these drivers almost ready for release?  Are they in alpha or beta?
Is there a patch that can be made to the existing 0.1.24.x drivers?

Best Regards,

-- 
Rob Krakora
MessageNet Systems
101 East Carmel Dr. Suite 105
Carmel, IN 46032
(317)566-1677 Ext 212
(317)663-0808 Fax