lavf: move urlcontext_child_class_next() to protocols.c

It needs to access the list of protocols directly, so it more properly
belongs there.

libavformat/avio.c

@@ -49,25 +49,6 @@ static void *urlcontext_child_next(void *obj, void *prev)
     return NULL;
 }
 
-static const AVClass *urlcontext_child_class_next(const AVClass *prev)
-{
-    int i;
-
-    /* find the protocol that corresponds to prev */
-    for (i = 0; ff_url_protocols[i]; i++) {
-        if (ff_url_protocols[i]->priv_data_class == prev) {
-            i++;
-            break;
-        }
-    }
-
-    /* find next protocol with priv options */
-    for (; ff_url_protocols[i]; i++)
-        if (ff_url_protocols[i]->priv_data_class)
-            return ff_url_protocols[i]->priv_data_class;
-    return NULL;
-}
-
 static const AVOption options[] = { { NULL } };
 const AVClass ffurl_context_class = {
     .class_name       = "URLContext",
@@ -75,7 +56,7 @@ const AVClass ffurl_context_class = {
     .option           = options,
     .version          = LIBAVUTIL_VERSION_INT,
     .child_next       = urlcontext_child_next,
-    .child_class_next = urlcontext_child_class_next,
+    .child_class_next = ff_urlcontext_child_class_next,
 };
 /*@}*/
 

libavformat/protocols.c

@@ -163,6 +163,26 @@ const URLProtocol *ff_url_protocols[] = {
     NULL,
 };
 
+const AVClass *ff_urlcontext_child_class_next(const AVClass *prev)
+{
+    int i;
+
+    /* find the protocol that corresponds to prev */
+    for (i = 0; ff_url_protocols[i]; i++) {
+        if (ff_url_protocols[i]->priv_data_class == prev) {
+            i++;
+            break;
+        }
+    }
+
+    /* find next protocol with priv options */
+    for (; ff_url_protocols[i]; i++)
+        if (ff_url_protocols[i]->priv_data_class)
+            return ff_url_protocols[i]->priv_data_class;
+    return NULL;
+}
+
+
 const char *avio_enum_protocols(void **opaque, int output)
 {
     const URLProtocol **p = *opaque;

libavformat/url.h

@@ -264,6 +264,8 @@ int ff_url_join(char *str, int size, const char *proto,
 void ff_make_absolute_url(char *buf, int size, const char *base,
                           const char *rel);
 
+const AVClass *ff_urlcontext_child_class_next(const AVClass *prev);
+
 extern const URLProtocol *ff_url_protocols[];
 
 #endif /* AVFORMAT_URL_H */