lavf: reorganize URLProtocols

Instead of a linked list constructed at av_register_all(), store them
in a constant array of pointers.

Since no registration is necessary now, this removes some global state
from lavf. This will also allow the urlprotocol layer caller to limit
the available protocols in a simple and flexible way in the following
commits.

1 files changed, 1 insertions, 1 deletions

diff --git a/libavformat/concat.c b/libavformat/concat.c
index 2fb3ba9059..de48f7b55f 100644
--- a/libavformat/concat.c
+++ b/libavformat/concat.c
@@ -181,7 +181,7 @@ static int64_t concat_seek(URLContext *h, int64_t pos, int whence)
     return result;
 }
 
-URLProtocol ff_concat_protocol = {
+const URLProtocol ff_concat_protocol = {
     .name           = "concat",
     .url_open       = concat_open,
     .url_read       = concat_read,