you can use chmap to query the channel map
http://git.alsa-project.org/?p=alsa-
lib.git;a=blob_plain;f=test/chmap.c;hb=HEAD
control.45 {
iface PCM
name 'Playback Channel Map'
value.0 0
value.1 0
value.2 0
value.3 0
value.4 0
value.5 0
value.6 0
value.7 0
comment {
access read
type INTEGER
count 8
range '0 - 36'
}
}
control.47 {
iface PCM
device 1
name 'Playback Channel Map'
value.0 0
value.1 0
comment {
access read
type INTEGER
count 2
range '0 - 36'
}
}
control.54 {
iface PCM
device 3
name 'Playback Channel Map'
value.0 0
value.1 0
comment {
access read
type INTEGER
count 2
range '0 - 36'
}
}
post pulseaudio verbose log when you play AC3 5.1 DVD to your spdif or
hdmi
you can find the channel matrix
https://wiki.ubuntu.com/PulseAudio/Log
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https://bugs.launchpad.net/bugs/1249705
Title:
HDMI output not available in 13.10
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