JsonConfig: support "logo": null and "logo": "/path/to/logo"

src/logo/logo.c

@@ -410,6 +410,12 @@ void ffLogoPrint(void)
 
     const FFLogoOptions* options = &instance.config.logo;
 
+    if (options->type == FF_LOGO_TYPE_NONE)
+    {
+        logoPrintNone();
+        return;
+    }
+
     //If the source is not set, we can directly print the detected logo.
     if(options->source.length == 0)
     {

src/logo/option.c

@@ -201,6 +201,22 @@ const char* ffParseLogoJsonConfig(void)
 
     yyjson_val* object = yyjson_obj_get(root, "logo");
     if (!object) return NULL;
+    if (yyjson_is_null(object))
+    {
+        options->type = FF_LOGO_TYPE_NONE;
+        options->paddingTop = 0;
+        options->paddingRight = 0;
+        options->paddingLeft = 0;
+        return NULL;
+    }
+
+    if (yyjson_is_str(object))
+    {
+        const char* value = yyjson_get_str(object);
+        ffStrbufSetS(&options->source, value);
+        return NULL;
+    }
+
     if (!yyjson_is_obj(object)) return "Property 'logo' must be an object";
 
     yyjson_val *key_, *val;