avfilter/fade: use inlink->frame_count.

libavfilter/vf_fade.c

@@ -54,7 +54,6 @@ typedef struct {
     int type;
     int factor, fade_per_frame;
     int start_frame, nb_frames;
-    unsigned int frame_index;
     int hsub, vsub, bpp;
     unsigned int black_level, black_level_scaled;
     uint8_t is_packed_rgb;
@@ -278,7 +277,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
     if (s->fade_state == VF_FADE_WAITING) {
         s->factor=0;
         if ((frame_timestamp >= (s->start_time/(double)AV_TIME_BASE))
-            && (s->frame_index >= s->start_frame)) {
+            && (inlink->frame_count >= s->start_frame)) {
             // Time to start fading
             s->fade_state = VF_FADE_FADING;
 
@@ -289,15 +288,15 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
 
             // Save start frame in case we are starting based on time and fading based on frames
             if ((s->start_time != 0) && (s->start_frame == 0)) {
-                s->start_frame = s->frame_index;
+                s->start_frame = inlink->frame_count;
             }
         }
     }
     if (s->fade_state == VF_FADE_FADING) {
         if (s->duration == 0) {
             // Fading based on frame count
-            s->factor = (s->frame_index - s->start_frame) * s->fade_per_frame;
-            if (s->frame_index > (s->start_frame + s->nb_frames)) {
+            s->factor = (inlink->frame_count - s->start_frame) * s->fade_per_frame;
+            if (inlink->frame_count > (s->start_frame + s->nb_frames)) {
                 s->fade_state = VF_FADE_DONE;
             }
 
@@ -342,8 +341,6 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
         }
     }
 
-    s->frame_index++;
-
     return ff_filter_frame(inlink->dst->outputs[0], frame);
 }