VO: add mechanisms to change VO commandline for VOs supporting it

command.c

@@ -3625,6 +3625,19 @@ void run_command(MPContext *mpctx, mp_cmd_t *cmd)
 
 #endif
 
+    case MP_CMD_VO_CMDLINE:
+        if (mpctx->video_out) {
+            char *s = cmd->args[0].v.s;
+            mp_msg(MSGT_CPLAYER, MSGL_INFO, "Setting vo cmd line to '%s'.\n",
+                   s);
+            if (vo_control(mpctx->video_out, VOCTRL_SET_COMMAND_LINE, s) > 0) {
+                set_osd_msg(OSD_MSG_TEXT, 1, osd_duration, "vo='%s'", s);
+            } else {
+                set_osd_msg(OSD_MSG_TEXT, 1, osd_duration, "Failed!");
+            }
+        }
+        break;
+
     case MP_CMD_AF_SWITCH:
         if (sh_audio) {
             af_uninit(mpctx->mixer.afilter);

input/input.c

@@ -224,6 +224,8 @@ static const mp_cmd_t mp_cmds[] = {
   { MP_CMD_SHOW_CHAPTERS, "show_chapters_osd", },
   { MP_CMD_SHOW_TRACKS, "show_tracks_osd", },
 
+  { MP_CMD_VO_CMDLINE, "vo_cmdline", { ARG_STRING } },
+
   {0}
 };
 

input/input.h

@@ -155,6 +155,9 @@ enum mp_command_type {
 
     MP_CMD_SHOW_CHAPTERS,
     MP_CMD_SHOW_TRACKS,
+
+    /// Video output commands
+    MP_CMD_VO_CMDLINE,
 };
 
 // The arg types

libvo/video_out.h

@@ -77,6 +77,8 @@ enum mp_voctrl {
     VOCTRL_GET_YUV_COLORSPACE,          // struct mp_csp_details
 
     VOCTRL_SCREENSHOT,                  // struct voctrl_screenshot_args
+
+    VOCTRL_SET_COMMAND_LINE,            // char*
 };
 
 // VOCTRL_SET_EQUALIZER