Re: [linux-audio-user] Is there no way to split L+R channels for ALSA applications?

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Subject: Re: [linux-audio-user] Is there no way to split L+R channels for ALSA applications?
From: Clemens Ladisch (clemens_AT_ladisch.de)
Date: Thu Apr 29 2004 - 12:32:49 EEST

Malcolm Baldridge wrote:
> a way to specify just one channel of a given output device, i.e.,
> just the LEFT channel or the RIGHT channel of the main PCM output
> device.

pcm.left {
        type plug
        slave.pcm "hw:0"
        slave.channels 2
        ttable.0.0 1
}

pcm.right {
        type plug
        slave.pcm "hw:0"
        slave.channels 2
        ttable.0.1 1
}

If you want to use both devices at the same time, you have to use the
dshare plugin:

pcm.shared_left {
        type plug
        slave.pcm {
                type dshare
                ipc_key 123456
                slave.pcm "hw:0"
                slave.channels 2
                bindings.0 0
        }
}

pcm.shared_right {
        type plug
        slave.pcm {
                type dshare
                ipc_key 123456
                slave.pcm "hw:0"
                slave.channels 2
                bindings.0 1
        }
}

HTH
Clemens

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