Open a new line when a speaker's playback line dies

Both desktop backends dropped writes to a line whose device had gone
away, and the per-speaker playout ignored any failure, so that speaker
stayed silent for the rest of the session. A write to a dead line now
throws; the playout drops that line and the speaker's next packet
opens a fresh one. Sound effects and the microphone test's loopback
reopen their line the same way.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

ts3-client/core/src/main/java/com/ts3client/audio/AudioPlayback.java

@@ -15,7 +15,12 @@ public interface AudioPlayback extends AutoCloseable {
     /** Begins playing whatever is written from now on. */
     void start();
 
-    /** Blocks until the audio has been queued for playback. */
+    /**
+     * Blocks until the audio has been queued for playback.
+     *
+     * @throws IllegalStateException once the line is gone for good (its device went away,
+     *                               say), so the caller can open another
+     */
     void write(byte[] buffer, int offset, int length);
 
     /** Blocks until everything already written has been played out. */

ts3-client/core/src/main/java/com/ts3client/audio/PerSpeakerPlayout.java

@@ -158,7 +158,12 @@ final class PerSpeakerPlayout implements Playout {
         Pcm16.encode(speaker.pcm, samples, speaker.out);
         try {
             speaker.line.write(speaker.out, 0, samples * 2);
-        } catch (RuntimeException ignored) {
+        } catch (RuntimeException e) {
+            // The line died (a device went away, say). Drop it rather than keep writing into it:
+            // the speaker's next packet starts a burst on a fresh one.
+            speakers.remove(speaker.stream, speaker);
+            speaker.close();
+            speaker.stream.stop();
         }
     }
 

ts3-client/desktop/src/main/java/com/ts3client/audio/desktop/JavaSoundPlayback.java

@@ -25,11 +25,13 @@ final class JavaSoundPlayback implements AudioPlayback {
 
     @Override
     public void write(byte[] buffer, int offset, int length) {
+        int written;
         try {
-            line.write(buffer, offset, length);
-        } catch (Exception ignored) {
-            // The line went away (device unplugged); the caller sees silence.
+            written = line.write(buffer, offset, length);
+        } catch (RuntimeException e) {
+            throw new IllegalStateException("The playback line failed", e);
         }
+        if (written < length && !line.isOpen()) throw new IllegalStateException("The playback line closed");
     }
 
     @Override

ts3-client/desktop/src/main/java/com/ts3client/audio/desktop/pipewire/PipeWirePlayback.java

@@ -37,7 +37,9 @@ final class PipeWirePlayback extends PipeWireStream implements AudioPlayback {
 
     @Override
     public void write(byte[] buffer, int offset, int length) {
-        ring.write(buffer, offset, length);
+        if (ring.write(buffer, offset, length) < length && ring.isClosed()) {
+            throw new IllegalStateException("The PipeWire stream ended");
+        }
     }
 
     @Override