Moved all c code to .h and .c files + removed struc_ prefix when not needed

class.c

@@ -0,0 +1,22 @@
+#include <libavutil/log.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+char* astiavClassItemName(AVClass* c, void* ptr) {
+	return (char*)c->item_name(ptr);
+}
+
+AVClassCategory astiavClassCategory(AVClass* c, void* ptr) {
+	if (c->get_category) return c->get_category(ptr);
+	return c->category;
+}
+
+AVClass** astiavClassParent(AVClass* c, void* ptr) {
+	if (c->parent_log_context_offset) {
+		AVClass** parent = *(AVClass ***) (((uint8_t *) ptr) + c->parent_log_context_offset);
+		if (parent && *parent) {
+			return parent;
+		}
+	}
+	return NULL;
+}