lavfi: make filter_frame non-recursive.

A lot of changes happen at the same time:

- Add a framequeue fifo to AVFilterLink.

- split AVFilterLink.status into status_in and status_out: requires
  changes to the few filters and programs that use it directly
  (f_interleave, split, filtfmts).

- Add a field ready to AVFilterContext, marking when the filter is ready
  and its activation priority.

- Add flags to mark blocked links.

- Change ff_filter_frame() to enqueue the frame.

- Change all filtering functions to update the ready field and the
  blocked flags.

- Update ff_filter_graph_run_once() to use the ready field.

- buffersrc: always push the frame immediately.

1 files changed, 5 insertions, 1 deletions

diff --git a/libavfilter/vf_extractplanes.c b/libavfilter/vf_extractplanes.c
index f1a0443dd1..65bba33d90 100644
--- a/libavfilter/vf_extractplanes.c
+++ b/libavfilter/vf_extractplanes.c
@@ -22,6 +22,10 @@
 #include "libavutil/imgutils.h"
 #include "libavutil/opt.h"
 #include "libavutil/pixdesc.h"
+
+#define FF_INTERNAL_FIELDS 1
+#include "libavfilter/framequeue.h"
+
 #include "avfilter.h"
 #include "drawutils.h"
 #include "internal.h"
@@ -283,7 +287,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
         const int idx = s->map[i];
         AVFrame *out;
 
-        if (outlink->status)
+        if (outlink->status_in)
             continue;
 
         out = ff_get_video_buffer(outlink, outlink->w, outlink->h);