output/Thread: ensure pending tags are flushed in all cases

NEWS

@@ -5,6 +5,8 @@ ver 0.20.12 (not yet released)
   - vorbis: fix Tremor support
 * player
   - log message when decoder is too slow
+* output
+  - fix hanging playback with soxr resampler
 
 ver 0.20.11 (2017/10/18)
 * storage

src/output/OutputThread.cxx

@@ -271,16 +271,15 @@ try {
 inline bool
 AudioOutput::PlayChunk()
 {
-	if (tags) {
-		const auto *tag = source.ReadTag();
-		if (tag != nullptr) {
-			const ScopeUnlock unlock(mutex);
-			try {
-				ao_plugin_send_tag(this, *tag);
-			} catch (const std::runtime_error &e) {
-				FormatError(e, "Failed to send tag to \"%s\" [%s]",
-					    name, plugin.name);
-			}
+	// ensure pending tags are flushed in all cases
+	const auto *tag = source.ReadTag();
+	if (tags && tag != nullptr) {
+		const ScopeUnlock unlock(mutex);
+		try {
+			ao_plugin_send_tag(this, *tag);
+		} catch (const std::runtime_error &e) {
+			FormatError(e, "Failed to send tag to \"%s\" [%s]",
+				    name, plugin.name);
 		}
 	}