libobs: add obs_source_frame_copy

libobs/obs-source.c

@@ -2288,6 +2288,12 @@ static void copy_frame_data(struct obs_source_frame *dst,
 	}
 }
 
+void obs_source_frame_copy(struct obs_source_frame *dst,
+		const struct obs_source_frame *src)
+{
+	copy_frame_data(dst, src);
+}
+
 static inline bool async_texture_changed(struct obs_source *source,
 		const struct obs_source_frame *frame)
 {

libobs/obs.h

@@ -1991,6 +1991,8 @@ static inline void obs_source_frame_destroy(struct obs_source_frame *frame)
 	}
 }
 
+EXPORT void obs_source_frame_copy(struct obs_source_frame *dst,
+		const struct obs_source_frame *src);
 
 #ifdef __cplusplus
 }