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ezzetabi

Member

Registered: 2006-08-27

Posts: 947

Select a default alsa PCM via environment variable

I often use a headset, to select if using the headset or the normal soundcard I use a environment variable thanks to this code:

## .asound.rc
@args.CARD {
  type string
  default {
    @func getenv
    vars {
      0 ALSA_CARD
    }
    default {
      @func refer
      name 'defaults.pcm.card'
    }
  }
}

Unfortunately the new headset has reversed channels so I created a pcm to fix:

pcm.swapped {
    type  route
    slave {
        pcm "hw:Set"
    }
    ttable.0.1   1
    ttable.1.0   1
}


pcm.HeadsetSwapped {
  type plug
  slave {
    pcm "pcm.swapped"
  }
}

The pcm works, but how can I set it via environment variable?

Thanks
Paolo