Full but still broken rework of everything

native/src/video_decoder.cpp

@@ -387,6 +387,10 @@ int video_decoder::get_shmem_fd() {
     return g_decoder.shmem_fd;
 }
 
+uint8_t* video_decoder::get_shmem_base() {
+    return g_decoder.shmem_base;
+}
+
 int video_decoder::get_decoder_width() {
     return g_decoder.width;
 }