avio: add a function for iterating though protocol names.

1 files changed, 10 insertions, 0 deletions

diff --git a/libavformat/avio.c b/libavformat/avio.c
index e043058974..ab7a7f51ec 100644
--- a/libavformat/avio.c
+++ b/libavformat/avio.c
@@ -57,6 +57,16 @@ URLProtocol *av_protocol_next(URLProtocol *p)
     else  return first_protocol;
 }
 
+const char *avio_enum_protocols(void **opaque, int output)
+{
+    URLProtocol **p = opaque;
+    *p = *p ? (*p)->next : first_protocol;
+    if (!*p) return NULL;
+    if ((output && (*p)->url_write) || (!output && (*p)->url_read))
+        return (*p)->name;
+    return avio_enum_protocols(opaque, output);
+}
+
 int ffurl_register_protocol(URLProtocol *protocol, int size)
 {
     URLProtocol **p;