player: deprecate "osd" command

It was extended by "seru" in 8d190244. This person could not be reached
(or does not reply), and it's in the way of LGPL relicensing. Deprecate
it, and mark the (probably) affected parts of the code with HAVE_GPL. To
be fair, even though the osd.c parts were refactored from the original
code, there's probably no copyright by seru on it. But for now play it
save. The mere existence of a 3rd OSD level is certainly not
copyrightable, so you still can set osd-level to 3 - just that it does
nothing.

DOCS/interface-changes.rst

@@ -34,6 +34,7 @@ Interface changes
     - replace vf_format's `peak` suboption by `sig-peak`, which is relative to
       the reference white level instead of in cd/m^2
     - renamed the TRCs `st2084` and `std-b67` to `pq` and `hlg` respectively
+    - the "osd" command is deprecated (use "cycle osd-level")
  --- mpv 0.25.0 ---
     - remove opengl-cb dxva2 dummy hwdec interop
       (see git "vo_opengl: remove dxva2 dummy hwdec backend")

input/cmd_list.c

@@ -98,7 +98,9 @@ const struct mp_cmd_def mp_cmds[] = {
   { MP_CMD_PLAYLIST_SHUFFLE, "playlist-shuffle", },
   { MP_CMD_SUB_STEP, "sub-step", { ARG_INT }, .allow_auto_repeat = true },
   { MP_CMD_SUB_SEEK, "sub-seek", { ARG_INT }, .allow_auto_repeat = true },
+#if HAVE_GPL
   { MP_CMD_OSD, "osd", { OARG_INT(-1) } },
+#endif
   { MP_CMD_PRINT_TEXT, "print-text", { ARG_STRING }, .allow_auto_repeat = true },
   { MP_CMD_SHOW_TEXT, "show-text", { ARG_STRING, OARG_INT(-1), OARG_INT(0) },
     .allow_auto_repeat = true},

player/command.c

@@ -5125,8 +5125,13 @@ int run_command(struct MPContext *mpctx, struct mp_cmd *cmd, struct mpv_node *re
         break;
     }
 
+#if HAVE_GPL
+    // Potentially GPL due to 8d190244d21a4d40bb9e8f7d51aa09ca1888de09.
     case MP_CMD_OSD: {
+        MP_WARN(mpctx, "The 'osd' command is deprecated. "
+                       "Use 'cycle osd-level' instead.\n");
         int v = cmd->args[0].v.i;
+#define MAX_OSD_LEVEL 3
         if (opts->osd_level > MAX_OSD_LEVEL)
             opts->osd_level = MAX_OSD_LEVEL;
         if (v < 0)
@@ -5140,6 +5145,7 @@ int run_command(struct MPContext *mpctx, struct mp_cmd *cmd, struct mpv_node *re
         mp_wakeup_core(mpctx);
         break;
     }
+#endif
 
     case MP_CMD_PRINT_TEXT: {
         MP_INFO(mpctx, "%s\n", cmd->args[0].v.s);

player/core.h

@@ -58,7 +58,6 @@ enum mp_osd_seek_info {
 
 enum {
     // other constants
-    MAX_OSD_LEVEL = 3,
     OSD_LEVEL_INVISIBLE = 4,
     OSD_BAR_SEEK = 256,
 

player/osd.c

@@ -441,6 +441,8 @@ static void sadd_osd_status(char **buffer, struct MPContext *mpctx, int level)
             talloc_free(text);
         } else {
             sadd_hhmmssff_u(buffer, get_playback_time(mpctx), fractions);
+#if HAVE_GPL
+            // Potentially GPL due to 8d190244d21a4d40bb9e8f7d51aa09ca1888de09.
             if (level == 3) {
                 double len = get_time_length(mpctx);
                 if (len >= 0) {
@@ -449,6 +451,7 @@ static void sadd_osd_status(char **buffer, struct MPContext *mpctx, int level)
                 }
                 sadd_percentage(buffer, get_percent_pos(mpctx));
             }
+#endif
         }
     }
 }