SquisherAsoundRc

From the ALSA wiki

Jump to: navigation, search

squisher's .asoundrc

# 2008-02-17: 8-channel card required
#
# This .asoundrc will allow the following:
#
# - upmix stereo files to 5.1 speakers.
# - playback real 5.1 sounds, on 5.1 speakers,
# - allow the playback of both stere(oupmixed) and surround(5.1) sources at the same time.
# - use the 6th and 7th channel (side speakers) as a separate soundcard, i.e. for headphones
#   (This is called the "alternate" output throughout the file, device names prefixed with 'a')
# - play mono sources in stereo (like skype & ekiga) on the alterate output
#
# Make sure you have "8 Channels" and NOT "6 Channels" selected in alsamixer!
# This file was tested on an nforce board with realtek alc888 chipset, but should work on
# any 8-channel card. Read through the comments if you have a different soundcard though!
#
# Please try the following commands, to make sure everything is working as it should.
#
# To test stereo upmix :      speaker-test -c2 -Ddefault -twav
# To test surround(5.1):      speaker-test -c6 -Dplug:dmix6 -twav
# To test alternative output: speaker-test -c2 -Daduplex -twav
# To test mono upmix:         speaker-test -c1 -Dmonoduplex -twav
#
#
# It may not work out of the box for all cards. If it doesnt work for you, read the comments throughout the file.
# The basis of this file was written by wishie of #alsa, and then modified with info from various sources by 
# squisher.

#Define the soundcard to use
pcm.snd_card {
    type hw
    card 0
    device 0
}

# 8 channel dmix - output whatever audio, to all 8 speakers
pcm.dmix8 {
    type dmix
    ipc_key 1024
    ipc_key_add_uid false
    ipc_perm 0660
    slave {
        pcm "snd_card"
        rate 48000
        channels 8
        period_time 0
        period_size 1024
        buffer_time 0
        buffer_size 5120
    }

# Some cards, like the "nforce" variants require the following to be uncommented. It routes the audio to t he correct speakers.
    bindings {
        0 0
        1 1
        2 4
        3 5
        4 2
        5 3
        6 6
        7 7
    }
}

# upmixing - duplicate stereo data to all 6 channels
pcm.ch51dup {
    type route
    slave.pcm dmix8
    slave.channels 8
    ttable.0.0 1
    ttable.1.1 1
    ttable.0.2 1
    ttable.1.3 1
    ttable.0.4 0.5
    ttable.1.4 0.5
    ttable.0.5 0.5
    ttable.1.5 0.5
}

# this creates a six channel soundcard
# and outputs to the eight channel one
# i.e. for usage in mplayer I had to define in ~/.mplayer/config:
#   ao=alsa:device=dmix6
#   channels=6
pcm.dmix6 {
    type route
    slave.pcm dmix8
    slave.channels 8
    ttable.0.0 1
    ttable.1.1 1
    ttable.2.2 1
    ttable.3.3 1
    ttable.4.4 1
    ttable.5.5 1
}

# rate conversion, needed i.e. for wine
pcm.2chplug {
    type plug
    slave.pcm "ch51dup"
}
pcm.a2chplug {
    type plug
    slave.pcm "dmix8"
}

# routes the channel for the alternative
# 2 channel output, which becomes the 7th and 8th channel 
# on the real soundcard
pcm.alt2ch {
    type route
    slave.pcm "a2chplug"
    slave.channels 8
    ttable.0.6    1
    ttable.1.7    1
}

# skype and ekiga are only mono, so route left channel to the right channel
# note: this gets routed to the alternative 2 channels
pcm.mono_playback {
    type route
    slave.pcm "a2chplug"
    slave.channels 8
    # Send Skype channel 0 to the L and R speakers at full volume
    ttable.0.6    1
    ttable.0.7    1
}

# 'full-duplex' device for use with aoss
pcm.duplex {
    type asym
    playback.pcm "2chplug"
    capture.pcm "hw:0"
}

pcm.aduplex {
    type asym
    playback.pcm "alt2ch"
    capture.pcm "hw:0"
}

pcm.monoduplex {
    type asym
    playback.pcm "mono_playback"
    capture.pcm "hw:0"
}

# for aoss
pcm.dsp0 "duplex"
ctl.mixer0 "duplex"

# softvol manages volume in alsa
# on my card wine needs the softvol to work
pcm.mainvol {
    type softvol
    slave.pcm "duplex"
    control {
        name "2ch-Upmix Master"
        card 0
    }
}

#pcm.!default "mainvol"

# set the default device according to the environment
# variable ALSA_DEFAULT_PCM and default to mainvol
# this is needed for ekiga, if you want to use the
# alternative output, as pwlib (ekiga's backend) doesn't
# support asoundrcs directly.
# Instead run: 'ALSA_DEFAULT_PCM=monoduplex ekiga'
pcm.!default {
    @func refer
    name { @func concat 
           strings [ "pcm."
                     { @func getenv
                       vars [ ALSA_DEFAULT_PCM ]
                       default "mainvol"
                     }
           ]
         }
}

# uncomment the following if you want to be able to control
# the mixer device through environment variables as well
#ctl.!default {
#    @func refer
#    name { @func concat 
#           strings [ "ctl."
#                     { @func getenv
#                       vars [ ALSA_DEFAULT_CTL
#                              ALSA_DEFAULT_PCM
#                       ]
#                       default "duplex"
#                     }
#           ]
#         }
#}

An updated version might be found at http://da.mcbf.net/wiki/DotAsoundrc .

Retrieved from "http://alsa.opensrc.org/SquisherAsoundRc"

GITHUB | EDIT