/usr/share/alsa/alsa.conf is in libasound2 1.0.25-1ubuntu10.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# ALSA library configuration file
#
# pre-load the configuration files
@hooks [
{
func load
files [
{
@func concat
strings [
{ @func datadir }
"/alsa.conf.d/"
]
}
"/etc/asound.conf"
"~/.asoundrc"
]
errors false
}
]
# load card-specific configuration files (on request)
cards.@hooks [
{
func load
files [
{
@func concat
strings [
{ @func datadir }
"/cards/aliases.conf"
]
}
]
}
{
func load_for_all_cards
files [
{
@func concat
strings [
{ @func datadir }
"/cards/"
{ @func private_string }
".conf"
]
}
]
errors false
}
]
#
# defaults
#
# show all name hints also for definitions without hint {} section
defaults.namehint.showall on
# show just basic name hints
defaults.namehint.basic on
# show extended name hints
defaults.namehint.extended on
#
defaults.ctl.card 0
defaults.pcm.card 0
defaults.pcm.device 0
defaults.pcm.subdevice -1
defaults.pcm.nonblock 1
defaults.pcm.compat 0
defaults.pcm.minperiodtime 5000 # in us
defaults.pcm.ipc_key 5678293
defaults.pcm.ipc_gid audio
defaults.pcm.ipc_perm 0660
defaults.pcm.dmix.max_periods 0
defaults.pcm.dmix.rate 48000
defaults.pcm.dmix.format "unchanged"
defaults.pcm.dmix.card defaults.pcm.card
defaults.pcm.dmix.device defaults.pcm.device
defaults.pcm.dsnoop.card defaults.pcm.card
defaults.pcm.dsnoop.device defaults.pcm.device
defaults.pcm.front.card defaults.pcm.card
defaults.pcm.front.device defaults.pcm.device
defaults.pcm.rear.card defaults.pcm.card
defaults.pcm.rear.device defaults.pcm.device
defaults.pcm.center_lfe.card defaults.pcm.card
defaults.pcm.center_lfe.device defaults.pcm.device
defaults.pcm.side.card defaults.pcm.card
defaults.pcm.side.device defaults.pcm.device
defaults.pcm.surround40.card defaults.pcm.card
defaults.pcm.surround40.device defaults.pcm.device
defaults.pcm.surround41.card defaults.pcm.card
defaults.pcm.surround41.device defaults.pcm.device
defaults.pcm.surround50.card defaults.pcm.card
defaults.pcm.surround50.device defaults.pcm.device
defaults.pcm.surround51.card defaults.pcm.card
defaults.pcm.surround51.device defaults.pcm.device
defaults.pcm.surround71.card defaults.pcm.card
defaults.pcm.surround71.device defaults.pcm.device
defaults.pcm.iec958.card defaults.pcm.card
defaults.pcm.iec958.device defaults.pcm.device
defaults.pcm.modem.card defaults.pcm.card
defaults.pcm.modem.device defaults.pcm.device
# truncate files via file or tee PCM
defaults.pcm.file_format "raw"
defaults.pcm.file_truncate true
defaults.rawmidi.card 0
defaults.rawmidi.device 0
defaults.rawmidi.subdevice -1
defaults.hwdep.card 0
defaults.hwdep.device 0
defaults.timer.class 2
defaults.timer.sclass 0
defaults.timer.card 0
defaults.timer.device 0
defaults.timer.subdevice 0
#
# PCM interface
#
# redirect to load-on-demand extended pcm definitions
pcm.cards cards.pcm
pcm.default cards.pcm.default
pcm.sysdefault cards.pcm.default
pcm.front cards.pcm.front
pcm.rear cards.pcm.rear
pcm.center_lfe cards.pcm.center_lfe
pcm.side cards.pcm.side
pcm.surround40 cards.pcm.surround40
pcm.surround41 cards.pcm.surround41
pcm.surround50 cards.pcm.surround50
pcm.surround51 cards.pcm.surround51
pcm.surround71 cards.pcm.surround71
pcm.iec958 cards.pcm.iec958
pcm.spdif iec958
pcm.hdmi cards.pcm.hdmi
pcm.dmix cards.pcm.dmix
pcm.dsnoop cards.pcm.dsnoop
pcm.modem cards.pcm.modem
pcm.phoneline cards.pcm.phoneline
pcm.hw {
@args [ CARD DEV SUBDEV ]
@args.CARD {
type string
default {
@func getenv
vars [
ALSA_PCM_CARD
ALSA_CARD
]
default {
@func refer
name defaults.pcm.card
}
}
}
@args.DEV {
type integer
default {
@func igetenv
vars [
ALSA_PCM_DEVICE
]
default {
@func refer
name defaults.pcm.device
}
}
}
@args.SUBDEV {
type integer
default {
@func refer
name defaults.pcm.subdevice
}
}
type hw
card $CARD
device $DEV
subdevice $SUBDEV
hint {
show {
@func refer
name defaults.namehint.extended
}
description "Direct hardware device without any conversions"
}
}
pcm.plughw {
@args [ CARD DEV SUBDEV ]
@args.CARD {
type string
default {
@func getenv
vars [
ALSA_PCM_CARD
ALSA_CARD
]
default {
@func refer
name defaults.pcm.card
}
}
}
@args.DEV {
type integer
default {
@func igetenv
vars [
ALSA_PCM_DEVICE
]
default {
@func refer
name defaults.pcm.device
}
}
}
@args.SUBDEV {
type integer
default {
@func refer
name defaults.pcm.subdevice
}
}
type plug
slave.pcm {
type hw
card $CARD
device $DEV
subdevice $SUBDEV
}
hint {
show {
@func refer
name defaults.namehint.extended
}
description "Hardware device with all software conversions"
}
}
pcm.plug {
@args [ SLAVE ]
@args.SLAVE {
type string
}
type plug
slave.pcm $SLAVE
}
pcm.shm {
@args [ SOCKET PCM ]
@args.SOCKET {
type string
}
@args.PCM {
type string
}
type shm
server $SOCKET
pcm $PCM
}
pcm.tee {
@args [ SLAVE FILE FORMAT ]
@args.SLAVE {
type string
}
@args.FILE {
type string
}
@args.FORMAT {
type string
default {
@func refer
name defaults.pcm.file_format
}
}
type file
slave.pcm $SLAVE
file $FILE
format $FORMAT
truncate {
@func refer
name defaults.pcm.file_truncate
}
}
pcm.file {
@args [ FILE FORMAT ]
@args.FILE {
type string
}
@args.FORMAT {
type string
default {
@func refer
name defaults.pcm.file_format
}
}
type file
slave.pcm null
file $FILE
format $FORMAT
truncate {
@func refer
name defaults.pcm.file_truncate
}
}
pcm.null {
type null
hint {
show {
@func refer
name defaults.namehint.basic
}
description "Discard all samples (playback) or generate zero samples (capture)"
}
}
#
# Control interface
#
ctl.sysdefault {
type hw
card {
@func getenv
vars [
ALSA_CTL_CARD
ALSA_CARD
]
default {
@func refer
name defaults.ctl.card
}
}
}
ctl.default ctl.sysdefault
ctl.hw {
@args [ CARD ]
@args.CARD {
type string
default {
@func getenv
vars [
ALSA_CTL_CARD
ALSA_CARD
]
default {
@func refer
name defaults.ctl.card
}
}
}
type hw
card $CARD
}
ctl.shm {
@args [ SOCKET CTL ]
@args.SOCKET {
type string
}
@args.CTL {
type string
}
type shm
server $SOCKET
ctl $CTL
}
#
# RawMidi interface
#
rawmidi.default {
type hw
card {
@func getenv
vars [
ALSA_RAWMIDI_CARD
ALSA_CARD
]
default {
@func refer
name defaults.rawmidi.card
}
}
device {
@func igetenv
vars [
ALSA_RAWMIDI_DEVICE
]
default {
@func refer
name defaults.rawmidi.device
}
}
}
rawmidi.hw {
@args [ CARD DEV SUBDEV ]
@args.CARD {
type string
default {
@func getenv
vars [
ALSA_RAWMIDI_CARD
ALSA_CARD
]
default {
@func refer
name defaults.rawmidi.card
}
}
}
@args.DEV {
type integer
default {
@func igetenv
vars [
ALSA_RAWMIDI_DEVICE
]
default {
@func refer
name defaults.rawmidi.device
}
}
}
@args.SUBDEV {
type integer
default -1
}
type hw
card $CARD
device $DEV
subdevice $SUBDEV
hint {
description "Direct rawmidi driver device"
device $DEV
}
}
rawmidi.virtual {
@args [ MERGE ]
@args.MERGE {
type string
default 1
}
type virtual
merge $MERGE
}
#
# Sequencer interface
#
seq.default {
type hw
}
seq.hw {
type hw
}
#
# HwDep interface
#
hwdep.default {
type hw
card {
@func getenv
vars [
ALSA_HWDEP_CARD
ALSA_CARD
]
default {
@func refer
name defaults.hwdep.card
}
}
device {
@func igetenv
vars [
ALSA_HWDEP_DEVICE
]
default {
@func refer
name defaults.hwdep.device
}
}
}
hwdep.hw {
@args [ CARD DEV ]
@args.CARD {
type string
default {
@func getenv
vars [
ALSA_HWDEP_CARD
ALSA_CARD
]
default {
@func refer
name defaults.hwdep.card
}
}
}
@args.DEV {
type integer
default {
@func igetenv
vars [
ALSA_HWDEP_DEVICE
]
default {
@func refer
name defaults.hwdep.device
}
}
}
type hw
card $CARD
device $DEV
}
#
# Timer interface
#
timer_query.default {
type hw
}
timer_query.hw {
type hw
}
timer.default {
type hw
class {
@func refer
name defaults.timer.class
}
sclass {
@func refer
name defaults.timer.sclass
}
card {
@func refer
name defaults.timer.card
}
device {
@func refer
name defaults.timer.device
}
subdevice {
@func refer
name defaults.timer.subdevice
}
hint.description "Default direct hardware timer device"
}
timer.hw {
@args [ CLASS SCLASS CARD DEV SUBDEV ]
@args.CLASS {
type integer
default {
@func refer
name defaults.timer.class
}
}
@args.SCLASS {
type integer
default {
@func refer
name defaults.timer.sclass
}
}
@args.CARD {
type string
default {
@func refer
name defaults.timer.card
}
}
@args.DEV {
type integer
default {
@func refer
name defaults.timer.device
}
}
@args.SUBDEV {
type integer
default {
@func refer
name defaults.timer.subdevice
}
}
type hw
class $CLASS
sclass $SCLASS
card $CARD
device $DEV
subdevice $SUBDEV
}
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