#
# Make everything go out of the "2ip_to4op" port by default
#
pcm.!default {
type plug
slave {
pcm "2ip_to_4op"
}
}
#
# Define the "2ip_to_4op" port
# Here it is a router that takes 2 input channels
# and routes them to 4 output channels for the pcm.multi pcm to take
# It defines a 4 channel output with the slave command
# and then routes channel 0 input to channel 0 & 2 output
# and routes channel 1 to outputs 1 and 3
# all with a unitary gain
#
# See: http://www.alsa-project.org/alsa-doc/alsa-lib/pcm_plugins.html
# or: http://alsa.opensrc.org/SurroundSound
# for more information
#
pcm.2ip_to_4op {
type route
slave {
pcm multi
channels 4
}
ttable.0.0 1.0
ttable.1.1 1.0
ttable.0.2 1.0
ttable.1.3 1.0
}
#
# Define the S/PDIF output (hw:0,1) as "digital_1"
pcm.digital_1 {
type hw
card 0
device 1
channels 2
}
#
# Define the HDMI output (hw:0,3) as "digital_2"
pcm.digital_2 {
type hw
card 0
device 3
channels 2
}
#
# Define the multi process which takes it's 4 channel input from
# the "2ip_to_4op" pcm process. The device type plugin is a multi
# and defines two slave outputs (a and b). It then binds channels 0
# and 1 to slave.a channels 0 and 1 and binds channels 2 and 3 to
# slave.b channels 0 and 1.
#
pcm.multi {
type multi
slaves.a {
pcm "digital_1"
channels 2
}
slaves.b {
pcm "digital_2"
channels 2
}
bindings.0.slave a
bindings.0.channel 0
bindings.1.slave a
bindings.1.channel 1
bindings.2.slave b
bindings.2.channel 0
bindings.3.slave b
bindings.3.channel 1
}