rendered paste body# cat /proc/asound/card0/pcm0p/sub0/hw_params
# Output to hw:0,0 to keep at 44.1k rather than dmix's 48k
# 44.1k stops dmix from working, though.
# From https://bugs.launchpad.net/debian/+source/sdl-mixer1.2/+bug/66483
# Not needed.
#defaults.pcm.dmix_max_periods -1
#defaults.pcm.rate_converter "samplerate_best"
# If get error "Slave PCM not usable", then need to use plug:
# If get error "Cannot find rate converter", then install libsamplerate and alsa-plugins
# Lunar Linux: lin ladspa-bs2b
# listplugins
# analyseplugin bs2b
pcm.bs2b {
type ladspa
path "/usr/lib/ladspa"
plugins {
0 {
id 4221 # Bauer stereophonic-to-binaural (4221/bs2b)
input {
controls [ 700 6 ]
}
}
}
slave.pcm "default"
}
# speaker-test -D headphones -c 2 -t wav
pcm.headphones {
type rate
slave {
pcm "plug:bs2b"
rate 48000
}
# Choices: samplerate_best samplerate_medium samplerate samplerate_order samplerate_linear
converter "samplerate_best"
}
pcm.ch51dup {
slave.pcm surround51
slave.channels 6
type route
# Front and rear
ttable.0.0 0.5
ttable.1.1 0.5
ttable.2.2 0.5
ttable.3.3 0.5
# Center and LFE
ttable.4.4 1
ttable.5.5 1
# Front left/right to center
ttable.0.4 0.5
ttable.1.4 0.5
# Front left/right to rear
ttable.0.2 0.5
ttable.1.3 0.5
}
# http://alsa.opensrc.org/SurroundSound
# http://alsa.opensrc.org/index.php/Low-pass_filter_for_subwoofer_channel_(HOWTO)
# Lunar: lin ladspa tap-plugins swh-plugins cmt-plugins libsamplerate
# Fedora: yum install ladspa ladspa-blop-plugins ladspa-caps-plugins ladspa-cmt-plugins ladspa-swh-plugins ladspa-tap-plugins libsamplerate
# Arch Linux: pacman -S ladspa blop swh-plugins libsamplerate tap-plugins cmt
# speaker-test -D upmix_20to51 -c 2 -t wav
# listplugins
# analyseplugin cmt
# http://plugin.org.uk/ladspa-swh/docs/ladspa-swh.html
# http://forums.gentoo.org/viewtopic-p-4528619.html#4528619
pcm.lowpass_21to21 {
type ladspa
slave.pcm upmix_21to51
# Set the path to ladspa, to fix this error:
# Playback open error: -2,No such file or directory
path "/usr/lib/ladspa"
channels 3
plugins {
0 {
id 1098 # Identity (Audio) (1098/identity_audio)
policy duplicate
input.bindings.0 "Input";
output.bindings.0 "Output";
}
1 {
id 1052 # High-pass filter
policy none
input.bindings.0 "Input";
output.bindings.0 "Output";
input {
controls [ 300 ]
}
}
2 {
id 1052 # High-pass filter
policy none
input.bindings.1 "Input";
output.bindings.1 "Output";
input {
controls [ 300 ]
}
}
3 {
id 1051 # Low-pass filter.
policy none
input.bindings.2 "Input";
output.bindings.2 "Output";
input {
controls [ 300 ]
}
}
# From http://alsa.opensrc.org/index.php/Low-pass_filter_for_subwoofer_channel_(HOWTO)
# Can be used instead of 1-3 above.
# 1 {
# id 1672 # 4 Pole Low-Pass Filter with Resonance (FCRCIA) (1672/lp4pole_fcrcia_oa)
# policy none
# input.bindings.2 "Input";
# output.bindings.2 "Output";
# input {
# controls [ 300 2 ]
# }
# }
}
}
# speaker-test -D upmix_20to51 -c 2 -t wav
# In audacious: upmix_20to51
pcm.upmix_20to51 {
type plug
slave.pcm "lowpass_21to21"
slave.channels 3
ttable {
0.0 1 # left channel
1.1 1 # right channel
0.2 0.5 # mix left and right ...
1.2 0.5 # ... channel for subwoofer
}
# slave.rate 48000 makes CPU utilization 20% instead of 3%
# Can't hear the difference with Audigy4 anyway.
# slave.rate 44100 is 3%, so that proves audacious outputs 44100
#slave.rate 48000
#converter "samplerate"
#slave.rate_converter "samplerate_best"
}
# In audacious: upmix_20to51_resample
# aplay -D upmix_20to51_resample ~/alsa/samplerate-test/udial.wav
pcm.upmix_20to51_resample {
type rate
slave {
pcm upmix_20to51
#format S32_LE
# Audigy4 upmixes to 48000 itself, and seems to use low-quality linear interpolation
rate 48000
}
# Choices: samplerate_best samplerate_medium samplerate samplerate_order samplerate_linear
# 8% CPU with samplerate_medium - good choice
converter "samplerate_medium"
#converter "samplerate_linear"
}
pcm.upmix_21to51 {
type plug
# For ice1724:
#slave.pcm surround51-ice
# For Audigy:
slave.pcm surround51
# For P5K ADI:
#slave.pcm surround51-adi
# Trying to pipe through Pulse Audio, to stop the clicks between songs.
# Can't get Pulse Audio to work like this.
#slave.pcm pulse
# Don't need to specify the number of channels.
slave.channels 6
ttable {
0.0 1 # front left
1.1 1 # front right
0.2 1 # rear left
1.3 1 # rear right
# Front left/right to center.
# Imbalanced because is to the left of the monitor!
# Would normally be 0.5 each.
0.4 0.5
1.4 0.5
# Subwoofer, more powerful to compensate for bass-removal from other speakers.
2.5 2
}
}
# Channels are wrong way around in doom! This fixes them.
# http://www.linuxforen.de/forums/archive/index.php/t-206470.html
# http://forums.seriouszone.com/showthread.php?t=49869&page=10
# http://forums.gentoo.org/viewtopic-p-4173170.html#4173170
# For Audigy 4
# Weird, doom3 has crappy sound if I add an alsa rate converter.
pcm.doom-surround51 {
slave.pcm surround51
slave.channels 6
type route
ttable.0.0 1
ttable.1.1 1
ttable.2.4 1
ttable.3.5 1
ttable.4.2 1
ttable.5.3 1
}
pcm.doom3-8930g {
type plug
slave.pcm {
type dmix
ipc_key 1093 # Must be unique
ipc_key_add_uid false
ipc_perm 0660
slave {
pcm "hw:0,0"
rate 44100
channels 2
period_time 0
period_size 1024
buffer_time 0
# Doom 3 wants buffer_size 8192
# In ~/.doom3/base/autoexec.cfg
# And ~/.quake4/q4base/autoexec.cfg
# seta s_alsa_pcm "doom3-8930g"
buffer_size 8192
}
}
}