On Wed, 19 Mar 2003, Takashi Iwai wrote:
> At Wed, 19 Mar 2003 17:49:51 +0100 (CET),
> Jaroslav wrote:
> >
> > Hi all,
> >
> > the dmix plugin was extended to support channel bindings and
> > mixing code for 32-bit samples (24-bit resolution).
> > I'd like to introduce new two plugins (seems also "most wanted" by
> > ALSA users): dsnoop and dshare. The dsnoop plugin allows spliting of one
> > stream to more applications. And finally the dshare plugin does sharing of
> > channels (thus you may use your multi-channel device for separated
> > independent tasks). The ALSA configuration syntax for both of new plugins
> > is same as for the dmix plugin. Please note that dshare plugin must have
> > the bindings section with unique destination channels otherwise it won't
> > work.
>
> great!
> it seems that the last meeting stimulated you so effectively :)
>
>
> could you post a couple of example configurations and usages?
Sure. First example is for the dmix plugin and ice1712 (10 playback
channels - last two are S/PDIF, so this configuration allows sharing of
the S/PDIF jack):
pcm.dmix_spdif {
type dmix
ipc_key 5678293
ipc_key_add_uid yes
slave {
pcm "hw:0,0"
}
bindings {
0 8
1 9
}
}
If you want to share first two analog channels with another applications,
simply use the same ipc_key configuration:
pcm.dmix_analog {
type dmix
ipc_key 5678293
ipc_key_add_uid yes
slave {
pcm "hw:0,0"
}
bindings {
0 0
1 1
}
}
Next example is for the dsnoop plugin (also ice1712, S/PDIF capture):
pcm.dsnoop_spdif {
type dsnoop
ipc_key 5978293
ipc_key_add_uid yes
slave {
pcm "hw:0,0"
}
bindings {
0 8
1 9
}
}
If you ommit the "bindings" section, you'll get all channels. Also, you
may define more pcm types with same ipc_key configuration with different
bindings as well.
And finally the dshare plugin (used standard stereo device and using left
and right channels separately):
pcm.dshare_left {
type dshare
ipc_key 6678293
ipc_key_add_uid yes
slave {
pcm "hw:0,0"
}
bindings {
0 0
}
}
pcm.dshare_right {
type dshare
ipc_key 6678293
ipc_key_add_uid yes
slave {
pcm "hw:0,0"
}
bindings {
0 1
}
}
Final words: I am very happy that we can do these things completely in the
user space but without client/server mechanisms as we promised at the
beginning of the development.
Jaroslav
-----
Jaroslav Kysela <[EMAIL PROTECTED]>
Linux Kernel Sound Maintainer
ALSA Project, SuSE Labs
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