CastAuthApk: Castkey AIDL mediaDrm plugin

Bug: 229298787
Test: Access Cast creds with MediaDrm plugin
Change-Id: I085b193ff4046d9005366c8bc8b3eb8020716b4b

cast_auth/mediadrm/include/SessionLibrary.h

@@ -0,0 +1,28 @@
+#ifndef SESSION_LIBRARY_H_
+#define SESSION_LIBRARY_H_
+
+#include <mutex>
+#include <vector>
+
+namespace castkeydrm {
+
+class SessionLibrary {
+public:
+    static SessionLibrary* get();
+    std::vector<uint8_t> createSession();
+    void closeSession(const std::vector<uint8_t>& session);
+
+private:
+    SessionLibrary() : next_session_id_(1) {}
+
+    static std::mutex singleton_lock_;
+    static SessionLibrary* singleton_;
+
+    std::mutex session_lock_;
+    uint32_t next_session_id_;
+    std::vector<std::vector<uint8_t>> sessions_;
+};
+
+} // namespace castkeydrm
+
+#endif // SESSION_LIBRARY_H_