sound linux setup

basic.lua

-- .config/m2i/basic.lua
-- https://gitlab.com/enetheru/midi2input

--[[ global settings ]]--
-- autoconnect: can be true, false, or a named jack port. default = true
autoconnect = true

Knob_1 = 11.0
Knob_2 = 12.0
Knob_3 = 13.0
Knob_4 = 14.0
Knob_5 = 15.0
Knob_6 = 16.0
Knob_7 = 17.0
Knob_8 = 18.0
Knob_M = 10.0
Button_01 = 32.0
Button_02 = 33.0
Button_03 = 34.0
Button_04 = 35.0
Button_05 = 36.0
Button_06 = 37.0
Button_07 = 38.0
Button_08 = 39.0
Button_11 = 40.0
Button_12 = 41.0
Button_13 = 42.0
Button_14 = 43.0
Button_15 = 44.0
Button_16 = 45.0
Button_17 = 46.0
Button_18 = 47.0

Devices = {
    Main_device = {
        name = function ()
            return "alsa_output.pci-0000_0e_00.4.analog-stereo"
        end,
        type = "sink",
        knob = Knob_1,
        button = Button_01
    },
    Headset_device = {
        name = function ()
            return "alsa_output.usb-MV-SILICON_fifine_SC3_20190808-00.analog-stereo"
        end,
        type = "sink",
        knob = Knob_M,
    },
    Music_device = {
        name = function ()
            return "music"
        end,
        type = "sink",
        knob = Knob_4,
        button = Button_04
    },
    Micro_device = {
        name = function ()
            return "alsa_input.usb-MV-SILICON_fifine_SC3_20190808-00.analog-stereo"
        end,
        type = "source",
        button = Button_18
    },
    Chrome_app = {
         name = function ()
            return GetSinkID("chrome")
         end,
         type = "sink-input",
         knob = Knob_2,
         button = Button_02
     }
 }

--[[ initialisation function ]]--
-- run immediately after the application launches and connects to the device
function script_init()
    print("init")
    alsaconnect('X-TOUCH MINI', '*')

    -- bug ?
    for index in pairs(Devices) do
        UpdateXTouchVolume(Devices[index])
        UpdateXTouchMute(Devices[index])
    end
end

function loop()
    detectwindow()

end

--[[ Input Event Handler ]]--
function midi_recv(data1, data2, status)
    print("==========> ", data1, " ", data2, " ==> ", status)

    for index in pairs(Devices) do
        if (data1 == 138.0 and data2 == Devices[index].button) then
            ToggleMute(Devices[index])
        end

        if (data1 == 186.0 and data2 == Devices[index].knob) then
            SetVolume(Devices[index], status)
        end
    end
end

function Exec(command)
    local handle = io.popen(command)
    local result = handle:read("*a")
    handle:close()

    return result:gsub("%s+", "")
end

function SetVolume(device, volumeXTouch)
    local amount = math.floor(65536 * tonumber(volumeXTouch)/127)
    Exec("pactl set-" .. device.type .. "-volume " .. device.name() .. " " .. tostring(amount))
end

function UpdateXTouchVolume(device)
    if not device.knob then
        return
    end

    midi_send({186.0, device.knob, GetVolume(device)})
end

function UpdateXTouchMute(device)
    if not device.button then
        return
    end

    if GetMuteState(device) then
    	ToggleOn(device.button)
    else
        ToggleOff(device.button)
    end
end

function ToggleMute(device)
    if GetMuteState(device) then
        ToggleOff(device.button)
        Exec("pactl set-" .. device.type .. "-mute " .. device.name() .. " 0")
    else
        ToggleOn(device.button)
        Exec("pactl set-" .. device.type .. "-mute " .. device.name() .. " 1")
    end
end

function ToggleOn(index)
	midi_send({154.0, index, 127.0})
end

function ToggleOff(index)
	midi_send({138.0, index, 0.0})
end

function GetSinkID(application)
    return Exec("pactl list sink-inputs | grep " .. application .. " -B30 | grep \"Sink Input\" | tail -1 | cut -d# -f2")
end

function GetMuteState(device)
    local state
	if device.type == "sink-input" then
		state = Exec("pactl list sink-inputs | grep \"Sink Input #".. device.name() .."\" -A30 | grep \"Mute\"")
	else
        state = Exec("pactl get-" .. device.type .. "-mute " .. device.name())
	end

	if state == "Mute:no" then
		return false
	end

	return true
end

function GetVolume(device)
    local volume
	if device.type == "sink-input" then
		volume = Exec("pactl list sink-inputs | grep \"Sink Input #".. device.name() .."\" -A30 | grep \"Volume\" | awk 'NR==1{ print $3 }'")
	else
        volume = Exec("pactl get-sink-volume " .. device.name() .. " | awk 'NR==1{ print $3 }'")
    end

    return volume - 1
end

music.conf

// .config/pipewire/pipewire.conf.d/music.conf

context.objects = [
    {   factory = adapter
        args = {
            factory.name     = support.null-audio-sink
            node.name        = "music"
            media.class      = Audio/Sink
            audio.position   = [ FL FR ]
            monitor.channel-volumes = true
            monitor.passthrough = true
            adapter.auto-port-config = {
                mode = dsp
                monitor = true
                position = preserve
            }
        }
    }
]