fix sdl overlay not locked for clearing

diff --git a/plat_sdl.c b/plat_sdl.c
index 7f41638..5e3eb7c 100644 (file)
--- a/plat_sdl.c
+++ b/plat_sdl.c
@@ -107,10 +107,12 @@ int plat_sdl_change_video_mode(int w, int h, int force)
     int W = plat_target.vout_method == vout_mode_overlay2x && w < 640 ? 2*w : w;
     plat_sdl_overlay = SDL_CreateYUVOverlay(W, h, SDL_UYVY_OVERLAY, plat_sdl_screen);
     if (plat_sdl_overlay != NULL) {
+      SDL_LockYUVOverlay(plat_sdl_overlay);
       if ((long)plat_sdl_overlay->pixels[0] & 3)
         fprintf(stderr, "warning: overlay pointer is unaligned\n");
 
       plat_sdl_overlay_clear();
+      SDL_UnlockYUVOverlay(plat_sdl_overlay);
     }
     else {
       fprintf(stderr, "warning: could not create overlay.\n");