/usr/share/alsa/pcm/iec958.conf is in libasound2-data 1.1.0-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Hardware output from iec958
#
pcm.!iec958 {
@args [ CARD DEV AES0 AES1 AES2 AES3 ]
@args.CARD {
type string
default {
@func getenv
vars [
ALSA_IEC958_CARD
ALSA_PCM_CARD
ALSA_CARD
]
default {
@func refer
name defaults.pcm.iec958.card
}
}
}
@args.DEV {
type integer
default {
@func igetenv
vars [
ALSA_IEC958_DEVICE
]
default {
@func refer
name defaults.pcm.iec958.device
}
}
}
@args.AES0 {
type integer
# consumer, not-copyright, emphasis-none, mode=0
default 0x04
}
@args.AES1 {
type integer
# original, PCM coder
default 0x82
}
@args.AES2 {
type integer
# source and channel
default 0x00
}
@args.AES3 {
type integer
# fs=48000Hz, clock accuracy=1000ppm
default 0x02
}
type empty
slave.pcm {
@func refer
name {
@func concat
strings [
"cards."
{
@func card_driver
card $CARD
}
".pcm.iec958." $DEV ":"
"CARD=" $CARD ","
"AES0=" $AES0 ","
"AES1=" $AES1 ","
"AES2=" $AES2 ","
"AES3=" $AES3
]
}
}
hint {
show {
@func refer
name defaults.namehint.basic
}
description "IEC958 (S/PDIF) Digital Audio Output"
device $DEV
}
}
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