fix(pw): show all input devices, not just the default source (#3387)

routeDirectionForMediaClass() returns SPA_DIRECTION_INPUT (== 0) for
Audio/Source, which collides with the 0 value used as the "no direction"
sentinel. The availability logic guarded on `wantDir != 0`, so for every
input device activeRoute was forced to null while hasDirRoutes stayed
true, leaving node.available = false. The audio panel's availableDevices()
then kept only the current default source and hid all other microphones.

Guard on the media class being a device node instead, matching the
isDeviceNode check already used during route parsing. This also repairs
recomputeEffectiveMute() for inputs, which carried the same guard.

Outputs were never affected because SPA_DIRECTION_OUTPUT == 1.

Co-authored-by: TheBinaryLoop <13447164+TheBinaryLoop@users.noreply.github.com>

Author: TheBinaryLoop

src/pipewire/pipewire_service.cpp

@@ -1607,12 +1607,15 @@ void PipeWireService::rebuildState() {
     // explicitly unavailable and no available alternative is hidden. Cards that report "unknown"
     // (many HDA/HiFi setups) stay visible.
     const std::uint32_t wantDir = routeDirectionForMediaClass(nd->mediaClass);
-    const DeviceRouteData* activeRoute = wantDir != 0 ? activeRouteForDirection(nd->routes, wantDir) : nullptr;
+    // SPA_DIRECTION_INPUT == 0, so `wantDir != 0` would wrongly exclude every Audio/Source; guard on the
+    // media class being a device node instead (matches the isDeviceNode check used during route parsing).
+    const bool isDeviceNode = nd->mediaClass == "Audio/Sink" || nd->mediaClass == "Audio/Source";
+    const DeviceRouteData* activeRoute = isDeviceNode ? activeRouteForDirection(nd->routes, wantDir) : nullptr;
     const DeviceData* device = nullptr;
     if (nd->deviceId != 0) {
       if (const auto devIt = m_devices.find(nd->deviceId); devIt != m_devices.end()) {
         device = &devIt->second;
-        if (activeRoute == nullptr && wantDir != 0) {
+        if (activeRoute == nullptr && isDeviceNode) {
           activeRoute = activeRouteForDirection(device->routes, wantDir);
         }
       }
@@ -1677,9 +1680,11 @@ void PipeWireService::rebuildState() {
 
 void PipeWireService::recomputeEffectiveMute(NodeData& nd) {
   const std::uint32_t wantDir = routeDirectionForMediaClass(nd.mediaClass);
-  const DeviceRouteData* nodeRoute = wantDir != 0 ? activeRouteForDirection(nd.routes, wantDir) : nullptr;
+  // SPA_DIRECTION_INPUT == 0, so guard on the media class rather than `wantDir != 0` (which would skip sources).
+  const bool isDeviceNode = nd.mediaClass == "Audio/Sink" || nd.mediaClass == "Audio/Source";
+  const DeviceRouteData* nodeRoute = isDeviceNode ? activeRouteForDirection(nd.routes, wantDir) : nullptr;
   const DeviceRouteData* deviceRoute = nullptr;
-  if (nd.deviceId != 0 && wantDir != 0) {
+  if (nd.deviceId != 0 && isDeviceNode) {
     const auto it = m_devices.find(nd.deviceId);
     if (it != m_devices.end()) {
       deviceRoute = activeRouteForDirection(it->second.routes, wantDir);