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, 3 insertions, 3 deletions

diff --git a/libavfilter/buffersrc.c b/libavfilter/buffersrc.c
index 9294811..1314397 100644
--- a/libavfilter/buffersrc.c
+++ b/libavfilter/buffersrc.c
@@ -184,6 +184,7 @@ static int av_buffersrc_add_frame_internal(AVFilterContext *ctx,
 
     if (!frame) {
         s->eof = 1;
+        ff_avfilter_link_set_in_status(ctx->outputs[0], AVERROR_EOF, AV_NOPTS_VALUE);
         return 0;
     } else if (s->eof)
         return AVERROR(EINVAL);
@@ -235,9 +236,8 @@ static int av_buffersrc_add_frame_internal(AVFilterContext *ctx,
         return ret;
     }
 
-    if ((flags & AV_BUFFERSRC_FLAG_PUSH))
-        if ((ret = ctx->output_pads[0].request_frame(ctx->outputs[0])) < 0)
-            return ret;
+    if ((ret = ctx->output_pads[0].request_frame(ctx->outputs[0])) < 0)
+        return ret;
 
     return 0;
 }