@Override
        public ModelLoader<Uri, ParcelFileDescriptor> build(Context context, GenericLoaderFactory factories) {
            return new FileDescriptorUriLoader(context, factories.buildModelLoader(GlideUrl.class,
                    ParcelFileDescriptor.class));
        }
The default factory for {@link FileDescriptorUriLoader}s.
core/src/main/java/com/bumptech/glide/load/model/file_descriptor/FileDescriptorUriLoader.java