player/command: add attached-picture flags to track add command

DOCS/interface-changes/hearing-impaired.txt

@@ -1 +1 @@
-add `hearing-impaired` and `visual-impaired` flags to track add command
+add `hearing-impaired`, `visual-impaired` and `attached-picture` flags to track add command

DOCS/man/input.rst

@@ -673,6 +673,11 @@ Track Manipulation
 
         Marks the track as suitable for the visually impaired.
 
+    <attached-picture> (only for ``video-add``)
+
+        Marks the track as an attached picture, same as ``albumart`` argument
+        for ```video-add``.
+
     The ``title`` argument sets the track title in the UI.
 
     The ``lang`` argument sets the track language, and can also influence

player/command.c

@@ -7187,7 +7187,8 @@ const struct mp_cmd_def mp_cmds[] = {
             {"flags", OPT_FLAGS(v.i,
                 {"select", 0}, {"auto", 1}, {"cached", 2},
                 {"hearing-impaired", TRACK_HEARING_IMPAIRED},
-                {"visual-impaired", TRACK_VISUAL_IMPAIRED}),
+                {"visual-impaired", TRACK_VISUAL_IMPAIRED},
+                {"attached-picture", TRACK_ATTACHED_PICTURE}),
                 .flags = MP_CMD_OPT_ARG},
             {"title", OPT_STRING(v.s), .flags = MP_CMD_OPT_ARG},
             {"lang", OPT_STRING(v.s), .flags = MP_CMD_OPT_ARG},

player/core.h

@@ -492,9 +492,10 @@ struct mp_abort_entry {
 #define BLACK_CIRCLE "\xe2\x97\x8f"
 
 enum track_flags {
-    TRACK_ATTACHED_PICTURE = 1 << 0,
+    // starts at 4, for cmd_track_add backwards compatibility
     TRACK_HEARING_IMPAIRED = 1 << 2,
     TRACK_VISUAL_IMPAIRED = 1 << 3,
+    TRACK_ATTACHED_PICTURE = 1 << 4,
 };
 
 // audio.c