lavfi: add const to the pads parameter of avfilter_pad_get_name/type

libavfilter/avfilter.c

@@ -627,12 +627,12 @@ fail:
     return ret;
 }
 
-const char *avfilter_pad_get_name(AVFilterPad *pads, int pad_idx)
+const char *avfilter_pad_get_name(const AVFilterPad *pads, int pad_idx)
 {
     return pads[pad_idx].name;
 }
 
-enum AVMediaType avfilter_pad_get_type(AVFilterPad *pads, int pad_idx)
+enum AVMediaType avfilter_pad_get_type(const AVFilterPad *pads, int pad_idx)
 {
     return pads[pad_idx].type;
 }

libavfilter/avfilter.h

@@ -359,7 +359,7 @@ struct AVFilterPad {
  *
  * @return name of the pad_idx'th pad in pads
  */
-const char *avfilter_pad_get_name(AVFilterPad *pads, int pad_idx);
+const char *avfilter_pad_get_name(const AVFilterPad *pads, int pad_idx);
 
 /**
  * Get the type of an AVFilterPad.
@@ -370,7 +370,7 @@ const char *avfilter_pad_get_name(AVFilterPad *pads, int pad_idx);
  *
  * @return type of the pad_idx'th pad in pads
  */
-enum AVMediaType avfilter_pad_get_type(AVFilterPad *pads, int pad_idx);
+enum AVMediaType avfilter_pad_get_type(const AVFilterPad *pads, int pad_idx);
 
 /**
  * Filter definition. This defines the pads a filter contains, and all the