Full but still broken rework of everything

native/include/rtsp_client.h

@@ -54,6 +54,10 @@ int get_rtsp_shmem_fd();
 int get_rtsp_width();
 int get_rtsp_height();
 
+// Get the shared memory base pointer (for reading frames)
+// Returns nullptr if not initialized
+uint8_t* get_rtsp_shmem_base();
+
 } // namespace rtsp_client
 
 #endif // RTSP_CLIENT_H