Track whether nodes are marked as headphones

Newer versions of PipeWire copy the PW_KEY_DEVICE_FORM_FACTOR property to the
sink node, so this should work to detect whether the device should be treated
as headphones or not.

1 files changed, 14 insertions, 2 deletions

diff --git a/alc/backends/pipewire.cpp b/alc/backends/pipewire.cpp
index e0b66092..6501a194 100644
--- a/alc/backends/pipewire.cpp
+++ b/alc/backends/pipewire.cpp
@@ -397,6 +397,7 @@ struct DeviceNode {
 
     uint32_t mId{};
     bool mCapture{};
+    bool mIsHeadphones{};
 
     uint mSampleRate{};
     DevFmtChannels mChannels{InvalidChannelConfig};
@@ -517,13 +518,21 @@ void NodeProxy::infoCallback(const pw_node_info *info)
             return;
         }
 
+        bool isHeadphones{};
+        if(const char *form_factor{spa_dict_lookup(info->props, PW_KEY_DEVICE_FORM_FACTOR)})
+        {
+            if(al::strcasecmp(form_factor, "headphones") == 0
+                || al::strcasecmp(form_factor, "headset") == 0)
+                isHeadphones = true;
+        }
+
         const char *devName{spa_dict_lookup(info->props, PW_KEY_NODE_NAME)};
         const char *nodeName{spa_dict_lookup(info->props, PW_KEY_NODE_DESCRIPTION)};
         if(!nodeName || !*nodeName) nodeName = spa_dict_lookup(info->props, PW_KEY_NODE_NICK);
         if(!nodeName || !*nodeName) nodeName = devName;
 
-        TRACE("Got %s device \"%s\"\n", isCapture ? "capture" : "playback",
-            devName ? devName : "(nil)");
+        TRACE("Got %s device \"%s\"%s\n", isCapture ? "capture" : "playback",
+            devName ? devName : "(nil)", isHeadphones ? " (headphones)" : "");
         TRACE("  \"%s\" = ID %u\n", nodeName ? nodeName : "(nil)", info->id);
 
         DeviceNode &node = AddDeviceNode(info->id);
@@ -531,6 +540,7 @@ void NodeProxy::infoCallback(const pw_node_info *info)
         else node.mName = "PipeWire node #"+std::to_string(info->id);
         node.mDevName = devName ? devName : "";
         node.mCapture = isCapture;
+        node.mIsHeadphones = isHeadphones;
     }
 }
 
@@ -1195,6 +1205,8 @@ bool PipeWirePlayback::reset()
             }
             if(!mDevice->Flags.test(ChannelsRequest) && match->mChannels != InvalidChannelConfig)
                 mDevice->FmtChans = match->mChannels;
+            if(match->mChannels == DevFmtStereo && match->mIsHeadphones)
+                mDevice->IsHeadphones = true;
         }
     }
     /* Force planar 32-bit float output for playback. This is what PipeWire