GUI: add audio want/got details

src/engine/engine.cpp

@@ -5952,6 +5952,14 @@ void DivEngine::switchMaster() {
   }
 }
 
+TAAudioDesc& DivEngine::getAudioDescWant() {
+  return want;
+}
+
+TAAudioDesc& DivEngine::getAudioDescGot() {
+  return got;
+}
+
 void DivEngine::initDispatch() {
   isBusy.lock();
   for (int i=0; i<song.systemLen; i++) {

src/engine/engine.h

@@ -536,6 +536,12 @@ class DivEngine {
     // switch master
     void switchMaster();
 
+    // get audio desc want
+    TAAudioDesc& getAudioDescWant();
+
+    // get audio desc
+    TAAudioDesc& getAudioDescGot();
+
     // init dispatch
     void initDispatch();