lavfi: split frame_count between input and output.

AVFilterLink.frame_count is supposed to count the number of frames
that were passed on the link, but with min_samples, that number is
not always the same for the source and destination filters.
With the addition of a FIFO on the link, the difference will become
more significant.

Split the variable in two: frame_count_in counts the number of
frames that entered the link, frame_count_out counts the number
of frames that were sent to the destination filter.

1 files changed, 3 insertions, 3 deletions

diff --git a/libavfilter/vf_fieldmatch.c b/libavfilter/vf_fieldmatch.c
index e155712caa..54a2c7aa60 100644
--- a/libavfilter/vf_fieldmatch.c
+++ b/libavfilter/vf_fieldmatch.c
@@ -740,7 +740,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
 
     /* scene change check */
     if (fm->combmatch == COMBMATCH_SC) {
-        if (fm->lastn == outlink->frame_count - 1) {
+        if (fm->lastn == outlink->frame_count_in - 1) {
             if (fm->lastscdiff > fm->scthresh)
                 sc = 1;
         } else if (luma_abs_diff(fm->prv, fm->src) > fm->scthresh) {
@@ -748,7 +748,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
         }
 
         if (!sc) {
-            fm->lastn = outlink->frame_count;
+            fm->lastn = outlink->frame_count_in;
             fm->lastscdiff = luma_abs_diff(fm->src, fm->nxt);
             sc = fm->lastscdiff > fm->scthresh;
         }
@@ -807,7 +807,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
     dst->interlaced_frame = combs[match] >= fm->combpel;
     if (dst->interlaced_frame) {
         av_log(ctx, AV_LOG_WARNING, "Frame #%"PRId64" at %s is still interlaced\n",
-               outlink->frame_count, av_ts2timestr(in->pts, &inlink->time_base));
+               outlink->frame_count_in, av_ts2timestr(in->pts, &inlink->time_base));
         dst->top_field_first = field;
     }