Problems with SI7012 on simulated 3 stereo channels and dmix

Problems with SI7012 on simulated 3 stereo channels and dmix

[Robert Rozman]

Hi,

I'm trying for over a month to get dmix working on 3 separate stereo
channels on SI7012 device but no success. I just get scrambled sound when
two apps (with same or different sample rate) are trying to access same
device (plug:a, b or c for example).

I'm attaching my asound.conf. On dmixer device everything works ok, but when
I try to run two instances of Alsaplayer on plug:a device I get scrambled
sound as long as instances are running - if I stop one of them - sound gets
OK. This all happens also of two different sample rate files are palyed on
same device.

Since I'm newbie to asoundrc magic, I kindly ask for any guidance - I'd love
to get this working...

Regards,

Robert

----------------------------asound.conf-------------------------------------

pcm_slave.sis {
pcm "hw:0"
channels 6
rate 48000
buffer_size 4096  # make these sizes smaller for lower latency
period_size 2048
periods 0
period_time 0
}

pcm.ch12 {
type dmix
ipc_key 47110815
slave sis
bindings.0 0
bindings.1 1
}

pcm.ch34 {
type dmix
ipc_key 47110815
slave sis
bindings.0 2
bindings.1 3
}

pcm.ch56 {
type dmix
ipc_key 47110815
slave sis
bindings.0 4
bindings.1 5
}


pcm.a {
type plug
slave.pcm ch12
}

pcm.b {
type plug
slave.pcm ch34
}

pcm.c {
type plug
slave.pcm ch56
}

pcm.dsp0 {
    type plug
    slave.pcm "dmixer"
}

pcm.dmixer  {
    type dmix
    ipc_key 1024
    slave {
        pcm "hw:0,0"
        period_time 0
        period_size 1024
        buffer_size 8192
        #periods 128
        rate 44100
    }
    bindings {
        0 0
        1 1
    }
}

ctl.mixer0 {
    type hw
    card 0
}





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Re: Problems with SI7012 on simulated 3 stereo channels and dmix

[Robert Rozman]

Hi,

I'd kindly ask also for another answer:
- why aplay doesn't play on "plug:a", b or c in system with attached
asoundrc ? It just sits there doing nothing - using -vvv doesn't help either
to spit out more info about problem...


Thanks ,

Robert.

----- Original Message ----- 
From: "Robert Rozman" <rozman@fri.uni-lj.si>
To: <alsa-devel@lists.sourceforge.net>
Sent: Saturday, June 26, 2004 6:51 PM
Subject: [Alsa-devel] Problems with SI7012 on simulated 3 stereo channels
and dmix


> Hi,
>
> I'm trying for over a month to get dmix working on 3 separate stereo
> channels on SI7012 device but no success. I just get scrambled sound when
> two apps (with same or different sample rate) are trying to access same
> device (plug:a, b or c for example).
>
> I'm attaching my asound.conf. On dmixer device everything works ok, but
when
> I try to run two instances of Alsaplayer on plug:a device I get scrambled
> sound as long as instances are running - if I stop one of them - sound
gets
> OK. This all happens also of two different sample rate files are palyed on
> same device.
>
> Since I'm newbie to asoundrc magic, I kindly ask for any guidance - I'd
love
> to get this working...
>
> Regards,
>
> Robert
>
> ----------------------------asound.conf-----------------------------------
--
>
> pcm_slave.sis {
> pcm "hw:0"
> channels 6
> rate 48000
> buffer_size 4096  # make these sizes smaller for lower latency
> period_size 2048
> periods 0
> period_time 0
> }
>
> pcm.ch12 {
> type dmix
> ipc_key 47110815
> slave sis
> bindings.0 0
> bindings.1 1
> }
>
> pcm.ch34 {
> type dmix
> ipc_key 47110815
> slave sis
> bindings.0 2
> bindings.1 3
> }
>
> pcm.ch56 {
> type dmix
> ipc_key 47110815
> slave sis
> bindings.0 4
> bindings.1 5
> }
>
>
> pcm.a {
> type plug
> slave.pcm ch12
> }
>
> pcm.b {
> type plug
> slave.pcm ch34
> }
>
> pcm.c {
> type plug
> slave.pcm ch56
> }
>
> pcm.dsp0 {
>     type plug
>     slave.pcm "dmixer"
> }
>
> pcm.dmixer  {
>     type dmix
>     ipc_key 1024
>     slave {
>         pcm "hw:0,0"
>         period_time 0
>         period_size 1024
>         buffer_size 8192
>         #periods 128
>         rate 44100
>     }
>     bindings {
>         0 0
>         1 1
>     }
> }
>
> ctl.mixer0 {
>     type hw
>     card 0
> }
>
>
>
>
>
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