lavfi: add link.current_pts field.

libavfilter/avfilter.c

@@ -238,6 +238,7 @@ int avfilter_config_links(AVFilterContext *filter)
         }
 
         inlink = link->src->nb_inputs ? link->src->inputs[0] : NULL;
+        link->current_pts =
         link->current_pts_us = AV_NOPTS_VALUE;
 
         switch (link->init_state) {
@@ -443,6 +444,7 @@ void ff_update_link_current_pts(AVFilterLink *link, int64_t pts)
 {
     if (pts == AV_NOPTS_VALUE)
         return;
+    link->current_pts = pts;
     link->current_pts_us = av_rescale_q(pts, link->time_base, AV_TIME_BASE_Q);
     /* TODO use duration */
     if (link->graph && link->age_index >= 0)

libavfilter/avfilter.h

@@ -433,6 +433,12 @@ struct AVFilterLink {
      */
     struct AVFilterGraph *graph;
 
+    /**
+     * Current timestamp of the link, as defined by the most recent
+     * frame(s), in link time_base units.
+     */
+    int64_t current_pts;
+
     /**
      * Current timestamp of the link, as defined by the most recent
      * frame(s), in AV_TIME_BASE units.