[pulseaudio-discuss] [PATCH] alsa-mixer: sb-omni-surround-5.1.conf: remove analog-surround-21, add Linux 4.3+ support

[Raymond Yau]

>>
>> > Do you mean 2.1 mode won't work with all usb audio since surround 5.1
of usb audio is already using route plugin
>> What do you mean by "all usb audio"? In 4.1/5.1 mode LFE and all other
outputs work properly, it is just for 2.1, which works as stereo.
>>
>> > If you don't have SPDIF output/input, you need to add your card in
USB-AUDIO.conf
>> Sound card has S/PDIF output, but not input. Not sure whether output
works properly though. I do not have speakers or any other hardware with
S/PDIF input to test it.
>>

>>>
>>> >
>>> > In 2.1 mode LFE is not actually working at all, so it is removed.
>>>
>>> Do you mean 2.1 mode won't work with all usb audio since surround 5.1
of usb audio is already using route plugin
>>>
>>> USB-Audio.pcm.surround51.0 {
>>> @args [ CARD ]
>>> @args.CARD { type string }
>>> @func refer
>>> name {
>>> @func concat
>>> strings [
>>> "cards.USB-Audio."
>>> { @func card_name card $CARD }
>>> ".pcm.surround51:CARD=" $CARD
>>> ]
>>> }
>>> default {
>>> 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
>>> slave {
>>> pcm {
>>> type hw
>>> card $CARD
>>> device 0
>>> }
>>> channels 6
>>> }
>>> }
>>> }
>>>

http://git.alsa-project.org/?p=alsa-lib.git;a=blob_plain;f=src/conf/pcm/surround21.conf;hb=HEAD

type route slave.pcm
{ @func refer name { @func concat strings [ "cards." { @func card_driver
card $CARD } ".pcm.surround51." $DEV ":CARD=" $CARD ] } }
ttable.0.FL 1 ttable.1.FR 1 ttable.2.LFE 1
hint { description "2.1 Surround output to Front and Subwoofer speakers"
device $DEV }

2.1 seem use 5.1 and route plugin

If you mean route plugin cannot be used twice, you need to remove surround
2.1 from USB-Audio.conf
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