Update

pipewire/.config/wireplumber/scripts/device/select-routes.lua

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+-- WirePlumber
+--
+-- Copyright © 2021-2022 Collabora Ltd.
+--    @author George Kiagiadakis <george.kiagiadakis@collabora.com>
+--
+-- Based on default-routes.c from pipewire-media-session
+-- Copyright © 2020 Wim Taymans
+--
+-- SPDX-License-Identifier: MIT
+--
+-- Update the device info cache with the latest information from EnumRoute(all
+-- the device routes) and trigger a "select-routes" event to select new routes
+-- for the given device configuration, if it has changed
+
+cutils = require ("common-utils")
+devinfo = require ("device-info-cache")
+log = Log.open_topic ("s-device")
+
+SimpleEventHook {
+  name = "device/select-route",
+  after = "device/select-profile",
+  interests = {
+    EventInterest {
+      Constraint { "event.type", "=", "device-added" },
+    },
+    EventInterest {
+      Constraint { "event.type", "=", "device-params-changed" },
+      Constraint { "event.subject.param-id", "c", "EnumRoute" },
+    },
+  },
+  execute = function (event)
+    local source = event:get_source ()
+    local device = event:get_subject ()
+
+    local dev_info = devinfo:get_device_info (device)
+    if not dev_info then
+      return
+    end
+
+    local new_route_infos = {}
+    local avail_routes_changed = false
+    local profile = nil
+
+    -- get current profile
+    for p in device:iterate_params ("Profile") do
+      profile = cutils.parseParam (p, "Profile")
+    end
+
+    -- look at all the routes and update/reset cached information
+    for p in device:iterate_params ("EnumRoute") do
+      -- parse pod
+      local route = cutils.parseParam (p, "EnumRoute")
+      if not route then
+        goto skip_enum_route
+      end
+
+      -- find cached route information
+      local route_info = devinfo.find_route_info (dev_info, route, true)
+
+      -- update properties
+      route_info.prev_available = route_info.available
+      if route_info.available ~= route.available then
+        log:info (device, "route " .. route.name .. " available changed " ..
+                         route_info.available .. " -> " .. route.available)
+        route_info.available = route.available
+        if profile and cutils.arrayContains (route.profiles, profile.index) then
+          avail_routes_changed = true
+        end
+      end
+
+      -- store
+      new_route_infos [route.index] = route_info
+
+      ::skip_enum_route::
+    end
+
+    -- replace old route_infos to lose old routes
+    -- that no longer exist on the device
+    dev_info.route_infos = new_route_infos
+    new_route_infos = nil
+
+    -- restore routes for profile
+    if profile then
+      local profile_changed = (dev_info.active_profile ~= profile.index)
+      dev_info.active_profile = profile.index
+
+      -- if the profile changed, restore routes for that profile
+      -- if any of the routes of the current profile changed in availability,
+      -- then try to select a new "best" route for each device and ignore
+      -- what was stored
+      if profile_changed or avail_routes_changed then
+        log:info (device,
+            string.format ("restore routes for profile(%s) of device(%s)",
+            profile.name, dev_info.name))
+
+        -- find the active device IDs for which to select routes
+        local active_ids = findActiveDeviceIDs (profile)
+        active_ids = Json.Array (active_ids):to_string ()
+
+        -- push select-routes event and let the hooks select the appropriate routes
+        local props = {
+          ["profile.changed"] = profile_changed,
+          ["profile.name"] = profile.name,
+          ["profile.active-device-ids"] = active_ids,
+        }
+        source:call ("push-event", "select-routes", device, props)
+      end
+    end
+  end
+}:register()
+
+-- These device ids are like routes(speaker, mic, headset etc) or sub-devices or
+-- paths with in the pipewire devices/soundcards.
+function findActiveDeviceIDs (profile)
+  -- parses the classes from the profile and returns the device IDs
+  ----- sample structure, should return { 0, 8 } -----
+  -- classes:
+  --  1: 2
+  --  2:
+  --    1: Audio/Source
+  --    2: 1
+  --    3: card.profile.devices
+  --    4:
+  --      1: 0
+  --      pod_type: Array
+  --      value_type: Spa:Int
+  --    pod_type: Struct
+  --  3:
+  --    1: Audio/Sink
+  --    2: 1
+  --    3: card.profile.devices
+  --    4:
+  --      1: 8
+  --      pod_type: Array
+  --      value_type: Spa:Int
+  --    pod_type: Struct
+  --  pod_type: Struct
+  local active_ids = {}
+  if type (profile.classes) == "table" and profile.classes.pod_type == "Struct" then
+    for _, p in ipairs (profile.classes) do
+      if type (p) == "table" and p.pod_type == "Struct" then
+        local i = 1
+        while true do
+          local k, v = p [i], p [i+1]
+          i = i + 2
+          if not k or not v then
+            break
+          end
+          if k == "card.profile.devices" and
+              type (v) == "table" and v.pod_type == "Array" then
+            for _, dev_id in ipairs (v) do
+              table.insert (active_ids, dev_id)
+            end
+          end
+        end
+      end
+    end
+  end
+  return active_ids
+end