find_subfiles: move sub_filenames() here

Move sub_filenames() and related code from subreader.c to new file
find_subfiles.c. This function is used to find subtitle files that
should be loaded for the current video; this functionality is not
specific to the particular kind of text subtitle handling implemented
in subreader.c.

Also reindent and prettify the moved code a bit.

1 files changed, 1 insertions, 0 deletions

diff --git a/mp_core.h b/mp_core.h
index 733962fe0c..0e41b58de3 100644
--- a/mp_core.h
+++ b/mp_core.h
@@ -24,6 +24,7 @@
 #include "options.h"
 #include "mixer.h"
 #include "sub/subreader.h"
+#include "sub/find_subfiles.h"
 
 // definitions used internally by the core player code