config: add lua-based device monitors

src/config/common/monitor-alsa.lua

+-- WirePlumber
+--
+-- Copyright © 2021 Collabora Ltd.
+--    @author George Kiagiadakis <george.kiagiadakis@collabora.com>
+--
+-- SPDX-License-Identifier: MIT
+
+Config = {
+  use_acp = true,
+  --use_device_reservation = true,
+  enable_midi = true,
+  enable_jack_client = false,
+}
+
+if Config.enable_midi then
+  midi_bridge = Node("spa-node-factory", {
+    ["factory.name"] = "api.alsa.seq.bridge",
+    ["node.name"] = "MIDI Bridge"
+  })
+end
+
+if Config.enable_jack_client then
+  jack_device = Device("spa-device-factory", {
+    ["factory.name"] = "api.jack.device"
+  })
+end
+
+function createNode(parent, id, type, factory, properties)
+  local dev_props = parent.properties
+  local dev = properties["api.alsa.pcm.device"] or properties["alsa.device"] or "0"
+  local subdev = properties["api.alsa.pcm.subdevice"] or properties["alsa.subdevice"] or "0"
+  local stream = properties["api.alsa.pcm.stream"] or "unknown"
+  local profile = properties["device.profile.name"] or "unknown"
+  local profile_desc = properties["device.profile.description"]
+
+  -- ensure the node has a media class
+  if not properties["media.class"] then
+    if stream == "capture" then
+      properties["media.class"] = "Audio/Source"
+    else
+      properties["media.class"] = "Audio/Sink"
+    end
+  end
+
+  -- ensure the node has a name
+  properties["node.nick"] = properties["node.nick"]
+      or dev_props["device.nick"]
+      or dev_props["api.alsa.card_name"]
+      or dev_props["alsa.card_name"]
+
+  properties["node.name"] = properties["node.name"]
+      or (dev_props["device.name"] or "unknown") .. "." .. stream .. "." .. dev .. "." .. subdev
+
+  -- ensure the node has a description
+  if not properties["node.description"] then
+    local desc = dev_props["device.description"] or "unknown"
+    local name = properties["api.alsa.pcm.name"] or properties["api.alsa.pcm.id"] or dev
+
+    if profile_desc then
+      properties["node.description"] = desc .. " " .. profile_desc
+    elseif subdev == "0" then
+      properties["node.description"] = desc .. " (" .. name .. " " .. subdev .. ")"
+    elseif dev == "0" then
+      properties["node.description"] = desc .. " (" .. name .. ")"
+    else
+      properties["node.description"] = desc
+    end
+  end
+
+  -- set the device id and spa factory name; REQUIRED, do not change
+  properties["device.id"] = parent["bound-id"]
+  properties["factory.name"] = factory
+
+  -- create the node
+  local node = Node("adapter", properties)
+  node:activate(Feature.Proxy.BOUND)
+  parent:store_managed_object(id, node)
+end
+
+function createDevice(parent, id, type, factory, properties)
+  -- ensure the device has a name
+  if not properties["device.name"] then
+    local s = properties["device.bus-id"] or properties["device.bus-path"] or "unknown"
+    properties["device.name"] = "alsa_card." .. s
+  end
+
+  -- ensure the device has a description
+  if not properties["device.description"] then
+    local d = nil
+    local f = properties["device.form-factor"]
+    local c = properties["device.class"]
+
+    if f == "internal" then
+      d = "Built-in Audio"
+    elseif c == "modem" then
+      d = "Modem"
+    end
+
+    d = d or properties["device.product.name"] or "Unknown device"
+    properties["device.description"] = d
+  end
+
+  -- set the icon name
+  if not properties["device.icon-name"] then
+    local icon = nil
+    local f = properties["device.form-factor"]
+    local c = properties["device.class"]
+    local b = properties["device.bus"]
+
+    if f == "microphone" then
+      icon = "audio-input-microphone"
+    elseif f == "webcam" then
+      icon = "camera-web"
+    elseif f == "handset" then
+      icon = "phone"
+    elseif f == "portable" then
+      icon = "multimedia-player"
+    elseif f == "tv" then
+      icon = "video-display"
+    elseif f == "headset" then
+      icon = "audio-headset"
+    elseif f == "headphone" then
+      icon = "audio-headphones"
+    elseif f == "speaker" then
+      icon = "audio-speakers"
+    elseif f == "hands-free" then
+      icon = "audio-handsfree"
+    elseif c == "modem" then
+      icon = "modem"
+    end
+
+    icon = icon or "audio-card"
+
+    if b then b = ("-" .. b) else b = "" end
+    properties["device.icon-name"] = icon .. "-analog" .. b
+  end
+
+  -- override the device factory to use ACP
+  if Config.use_acp then
+    factory = "api.alsa.acp.device"
+  end
+
+  -- create the device
+  local device = SpaDevice(factory, properties)
+  device:connect("create-object", createNode)
+  device:activate(Feature.SpaDevice.ENABLED | Feature.Proxy.BOUND)
+  parent:store_managed_object(id, device)
+end
+
+monitor = SpaDevice("api.alsa.enum.udev")
+monitor:connect("create-object", createDevice)
+monitor:activate(Feature.SpaDevice.ENABLED)

src/config/common/monitor-bluez5.lua

+-- WirePlumber
+--
+-- Copyright © 2021 Collabora Ltd.
+--    @author George Kiagiadakis <george.kiagiadakis@collabora.com>
+--
+-- SPDX-License-Identifier: MIT
+
+function createNode(parent, id, type, factory, properties)
+  local dev_props = parent.properties
+
+  -- ensure the node has a name and description
+  local devname = dev_props["device.description"]
+      or dev_props["device.name"]
+      or dev_props["device.nick"]
+      or dev_props["device.alias"]
+      or "bluetooth-device"
+  properties["node.name"] = factory .. "." .. devname
+  properties["node.description"] = devname
+
+  -- transfer path & address from the device to the node
+  properties["api.bluez5.path"] = dev_props["api.bluez5.path"]
+  properties["api.bluez5.address"] = dev_props["api.bluez5.address"]
+
+  -- set the device id and spa factory name; REQUIRED, do not change
+  properties["device.id"] = parent["bound-id"]
+  properties["factory.name"] = factory
+
+  -- create the node; bluez requires "local" nodes, i.e. ones that run in
+  -- the same process as the spa device, for several reasons
+  local node = LocalNode("adapter", properties)
+  node:activate(Feature.Proxy.BOUND)
+  parent:store_managed_object(id, node)
+end
+
+function createDevice(parent, id, type, factory, properties)
+  -- create the device
+  local device = SpaDevice(factory, properties)
+  device:connect("create-object", createNode)
+  device:activate(Feature.SpaDevice.ENABLED | Feature.Proxy.BOUND)
+  parent:store_managed_object(id, device)
+end
+
+monitor = SpaDevice("api.bluez5.enum.dbus")
+monitor:connect("create-object", createDevice)
+monitor:activate(Feature.SpaDevice.ENABLED)

src/config/common/monitor-v4l2.lua

+-- WirePlumber
+--
+-- Copyright © 2021 Collabora Ltd.
+--    @author George Kiagiadakis <george.kiagiadakis@collabora.com>
+--
+-- SPDX-License-Identifier: MIT
+
+function createNode(parent, id, type, factory, properties)
+  local dev_props = parent.properties
+
+  -- ensure the node has a name and description
+  local devname = dev_props["device.name"]
+      or dev_props["device.nick"]
+      or dev_props["device.alias"]
+      or "v4l2-device"
+  properties["node.name"] = factory .. "." .. devname
+  properties["node.description"] = dev_props["device.description"] or devname
+
+  -- set the device id and spa factory name; REQUIRED, do not change
+  properties["device.id"] = parent["bound-id"]
+  properties["factory.name"] = factory
+
+  -- create the node
+  local node = Node("spa-node-factory", properties)
+  node:activate(Feature.Proxy.BOUND)
+  parent:store_managed_object(id, node)
+end
+
+function createDevice(parent, id, type, factory, properties)
+  -- ensure the device has a name
+  properties["device.name"] = properties["device.name"]
+      or "v4l2_device." .. (properties["device.bus-id"] or properties["device.bus-path"] or "unknown")
+
+  -- ensure the device has a description
+  properties["device.description"] = properties["device.description"]
+      or properties["device.product.name"]
+      or "Unknown device"
+
+  -- create the device
+  local device = SpaDevice(factory, properties)
+  device:connect("create-object", createNode)
+  device:activate(Feature.SpaDevice.ENABLED | Feature.Proxy.BOUND)
+  parent:store_managed_object(id, device)
+end
+
+monitor = SpaDevice("api.v4l2.enum.udev")
+monitor:connect("create-object", createDevice)
+monitor:activate(Feature.SpaDevice.ENABLED)

src/config/desktop-ep/monitor-alsa.lua

+../common/monitor-alsa.lua
\ No newline at end of file

src/config/desktop-ep/monitor-bluez5.lua

+../common/monitor-bluez5.lua
\ No newline at end of file

src/config/desktop-ep/monitor-v4l2.lua

+../common/monitor-v4l2.lua
\ No newline at end of file