[Pkg-alsa-devel] Bug#335046: .asoundrc?

[Thomas Hood]

tags 335046 - unreproducible
stop

Marcel Sebek wrote:
> I investigated it a bit further and found this. Dmix uses IPC for
> communication, but there's only one IPC channel created. It can be used
> for one card, but not for more. If I change the system config file to
> have ipc_key different for each card, it works (it is terrible hack,
> nothing nice).
> 
> I wonder how it can work for you. For me it seems impossible. Maybe you
> misunderstood me, I meant simultaneously playing something on both
> cards.


Ah!  I didn't realize that you were playing to both simultaneously.

You do have to set the ipc_key differently for the two separate dmix
instances.  You can do this by defining your own dmix plugins in
.asoundrc.

The documentation for the dmix plugin says:

    ipc_key specfies the unique IPC key in integer. This number
    must be unique for each different dmix definition, since
    the shared memory is created with this key number. When
    ipc_key_add_uid is set true, the uid value is added to the
    value set in ipc_key. This will avoid the confliction of
    the same IPC key with different users concurrently.

Do you think that there should be an 'ipc_key_add_card' option too?
-- 
Thomas