Allow upmix to 5.1 and allow multiple applications to play sound

[Florian Schwade <florian.schwade@xxxxxxxxxxxxxx>]

Hello,
I already tried to find help in IRC but I had no luck there.
What I want to do is the following:
I have 5.1 sound system which I want to use. Most of the files I want to 
play just are stereo. So I need upmix to 5.1. I've already tried a lot 
of .asoundrc configurations and I think I understood how they work. As 
far as I understood it, I need an upmix to 5.1 and a 6 channel dmixer. 
So I thought it must look like this:

# 6 channel dmix:
pcm.dmix6 {
      type dmix
         ipc_key 1024
         ipc_key_add_uid false
         ipc_perm 0660
         slave {
                 pcm "hw:0,0"
                 rate 48000
                 channels 6
                 period_time 0
                 period_size 1024
                 buffer_time 0
                 buffer_size 5120
         }
      }

# upmixing:
pcm.ch51dup {
         type route
         slave.pcm dmix6
         slave.channels 6
         ttable.0.0 0.5
         ttable.1.1 0.5
         ttable.0.2 0.5
         ttable.1.3 0.5
         ttable.0.4 0.5
         ttable.1.4 0.5
         ttable.0.5 0.5
         ttable.1.5 0.5
    }

pcm.duplex {
      type asym
      playback.pcm "ch51dup" # upmix first
      capture.pcm "hw:0"
}

# change default device:
pcm.!default {
      type plug
      slave.pcm "duplex"
}


If I run aplay now to play something it returns me this error:
ALSA lib pcm_params.c:2150:(snd1_pcm_hw_refine_slave) Slave PCM not usable
aplay: set_params:1031: invalid configuration for this device: no 
suppported configuration

Any ideas?

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