The app is technically functional

src/player/playQueue.cpp

@@ -0,0 +1,35 @@
+#include <string.h>
+#include <string>
+#include <deque>
+#include "playQueue.hpp"
+
+#include <iostream> // debug
+
+// NOTE: Acronym is OpenSubsonicPlayerQueue
+
+std::deque<std::string> OSSPQ_Items;
+
+int internal_OSSPQ_Init() {
+    //
+}
+
+int internal_OSSPQ_AppendToEnd(char* id) {
+    std::string cpp_id(id);
+    OSSPQ_Items.push_back(cpp_id);
+    return 0;
+}
+
+char* internal_OSSPQ_PopFromFront() {
+    if (OSSPQ_Items.empty()) {
+        // No items in play queue
+        return NULL;
+    }
+
+    char* id = strdup(OSSPQ_Items.front().c_str()); // Heap allocate id
+    OSSPQ_Items.pop_front();
+    return id;
+}
+
+int internal_OSSPQ_GetItemCount() {
+    return OSSPQ_Items.size();
+}