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kokoko3k

Member

Registered: 2008-11-14

Posts: 2,457

[SOLVED] what is "defaults.pcm.dmix.rate" in .asoundrc for?

I'm playing with this basic setup in ~/.asoundrc:

defaults.pcm.dmix.rate 44100

pcm.!default {
  type dmix
  ipc_key 1024
  slave {
    pcm "hw:0,0"
    periods 128
    period_time 0
    period_size 1024 # must be power of 2
    buffer_size 4096
  }
}

But when i try to play something, it still defaults to 48000.

mpv audiocheck.net_sweep_10000Hz_22030Hz_-3dBFS_10s.wav  -ao alsa
[..]
AO: [alsa] 48000Hz stereo 2ch s16

Adding "rate 44100" to the slave section make it works, but what if i'd want to change a bunch of slaves rates at once?
What is the point of "defaults.pcm.dmix.rate"?

Thanks.

Last edited by kokoko3k (2016-07-07 08:03:29)

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kokoko3k

Member

Registered: 2008-11-14

Posts: 2,457

Re: [SOLVED] what is "defaults.pcm.dmix.rate" in .asoundrc for?

Man, duck debugging is really something...
I swear, before posting my question i tried hard to solve the problem; but just after hitting the submit buttons, new ideas comes to mind and i figured out it all.

"defaults.pcm.dmix.rate" just affects the default alsa configuration/the default mainline-shipped dmix defined in /usr/share/alsa/pcm/dmix.conf
So, looking at that file, i undestrood that it uses the "@func refer" directive to get default values, and so here is my working .asoundrc

mixing_rate=48000

pcm.!default {
  type dmix
  ipc_key 1024
  slave {
    pcm "hw:0,0"
    periods 128
    period_time 0
    period_size 1024 # must be power of 2
    buffer_size 4096
    rate {
        @func refer
        name mixing_rate
    }
  }
}

Yep, it is like using script global variables, nice!

Last edited by kokoko3k (2016-07-07 08:06:00)

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Retroarch User? Try my koko-aio shader !