Improve session filename error handling

src/main.rs

@@ -105,7 +105,7 @@ impl IAudioSessionNotification_Impl for SessionNotification {
         MUTER
             .lock()
             .unwrap()
-            .add_session_if_interesting(ses)
+            .add_session(ses)
             .unwrap();
         Ok(())
     }
@@ -201,28 +201,34 @@ impl SessionMuter {
         }
     }
 
-    fn add_session_if_interesting(
+    fn add_session(
         self: &mut SessionMuter,
         session: IAudioSessionControl2,
     ) -> Result<(), Box<dyn Error>> {
-        let file_name = self.session_to_filename(&session);
-        if file_name.is_err() {
-            return Ok(());
-        }
-        let fn_str = file_name
-            .unwrap()
-            .to_os_string()
-            .to_string_lossy()
-            .to_string();
-        if self.mute_executables.contains(&fn_str) {
-            println!("Adding session from: {:?}", fn_str);
-            unsafe {
-                let volume: ISimpleAudioVolume = session.cast()?;
-                volume.SetMute(self.mute_flag, null_mut())?;
+        unsafe {
+            if session.IsSystemSoundsSession().is_ok() {
+                return Ok(());
             }
-            self.sessions.lock().unwrap().push(session);
         }
-        return Ok(());
+        match self.session_to_filename(&session) {
+            Ok(file_name) => {
+                let fn_str = file_name
+                    .to_string_lossy()
+                    .to_string();
+                if self.mute_executables.contains(&fn_str) {
+                    println!("Adding session from: {:?}", fn_str);
+                    unsafe {
+                        let volume: ISimpleAudioVolume = session.cast()?;
+                        volume.SetMute(self.mute_flag, null_mut())?;
+                    }
+                    self.sessions.lock().unwrap().push(session);
+                }
+            },
+            Err(err) => {
+                println!("Unable to get filename for session {:?}", err);
+            },
+        }
+        Ok(())
     }
 
     unsafe fn set_mute_all(self: &mut SessionMuter, mute: bool) {
@@ -308,7 +314,7 @@ impl SessionMuter {
             })
             .collect::<Result<Vec<IAudioSessionControl2>, _>>()?;
         for session in device_sessions {
-            self.add_session_if_interesting(session)?;
+            self.add_session(session)?;
         }
         let prop_store = device.OpenPropertyStore(STGM_READ)?;
         // this definition isn't in windows-rs yet apparently :(