Working on audio in web part 1

src/AudioPlayerAsync.h

@@ -5,11 +5,14 @@
 #include <unordered_map>
 #include <memory>
 #include <mutex>
+#include <SDL2/SDL.h>
+
+#ifndef __EMSCRIPTEN__
 #include <queue>
 #include <thread>
 #include <condition_variable>
 #include <functional>
-#include <SDL2/SDL.h>
+#endif
 
 class AudioPlayerAsync {
 public:
@@ -30,12 +33,14 @@ public:
     void exit() { stop = true; }
 
 private:
+#ifndef __EMSCRIPTEN__
     void workerThread();
 
     std::thread worker;
     std::mutex mtx;
     std::condition_variable cv;
     std::queue<std::function<void()>> taskQueue;
+#endif
     bool stop = false;
 
     std::unordered_map<std::string, Mix_Chunk*> soundCache;