output/PipeWire: activate stream in Drain()

NEWS

@@ -5,6 +5,7 @@ ver 0.23.8 (not yet released)
   - cdio_paranoia: fix crash if no drive was found
   - cdio_paranoia: faster cancellation
   - cdio_paranoia: don't scan for replay gain tags
+  - pipewire: fix playback of very short tracks
   - snapcast: fix busy loop while paused
   - snapcast: fix stuttering after resuming playback
 * mixer

src/output/plugins/PipeWireOutputPlugin.cxx

@@ -866,6 +866,17 @@ PipeWireOutput::Drain()
 {
 	const PipeWire::ThreadLoopLock lock(thread_loop);
 
+	if (drained)
+		return;
+
+	if (!active) {
+		/* there is data in the ring_buffer, but the stream is
+		   not yet active; activate it now to ensure it is
+		   played before this method returns */
+		active = true;
+		pw_stream_set_active(stream, true);
+	}
+
 	drain_requested = true;
 	AtScopeExit(this) { drain_requested = false; };