player: make all autoload extensions configurable

--audio-file-auto, --cover-art-auto, and --sub-auto all work by using an
internally hardcoded list that determine what file extensions get
recognized. This is fine and people periodically update it, but we can
actually expose this as a stringlist option instead. This way users can
add or remove any file extension for any type. For the most part, this
is pretty pretty easy and involves making sub_exts, etc. the defaults
for the new options (--audio-file-auto-exts, --cover-art-auto-exts, and
--sub-auto-exts). There's actually one slight complication however. The
input code uses mp_might_be_subtitle_file which guesses if the file drag
and dropped file is a subtitle. The input ctx has no access to mpctx so
we have to be clever here.

For this, the trick is to recognize that we can leverage the
m_option_change_callback. We add a new flag, UPDATE_SUB_EXTS, which
fires when the player starts up. Then in the callback, we can set the
value of sub_exts in external_files to opts->sub_auto_exts. Whenever the
option updates, the callback is fired again and sub_exts updates. That
way mp_might_be_subtitle_file can just operate off of this global
variable instead of trying to mess with the core mpv state directly.

Fixes #12000.

1 files changed, 3 insertions, 0 deletions

diff --git a/options/options.h b/options/options.h
index fac88dd939..6f8c8a5998 100644
--- a/options/options.h
+++ b/options/options.h
@@ -309,8 +309,11 @@ typedef struct MPOpts {
     char **external_files;
     bool autoload_files;
     int sub_auto;
+    char **sub_auto_exts;
     int audiofile_auto;
+    char **audiofile_auto_exts;
     int coverart_auto;
+    char **coverart_auto_exts;
     bool coverart_whitelist;
     bool osd_bar_visible;