lavfi: add ff_inlink_acknowledge_status().

Also introduce libavfilter/filters.h for all functions needed
to implement filters.

1 files changed, 16 insertions, 0 deletions

diff --git a/libavfilter/avfilter.c b/libavfilter/avfilter.c
index 12f12d1406..f3dea6e65e 100644
--- a/libavfilter/avfilter.c
+++ b/libavfilter/avfilter.c
@@ -39,6 +39,7 @@
 
 #include "audio.h"
 #include "avfilter.h"
+#include "filters.h"
 #include "formats.h"
 #include "internal.h"
 
@@ -1543,6 +1544,21 @@ int ff_filter_activate(AVFilterContext *filter)
     return ret;
 }
 
+int ff_inlink_acknowledge_status(AVFilterLink *link, int *rstatus, int64_t *rpts)
+{
+    *rpts = link->current_pts;
+    if (ff_framequeue_queued_frames(&link->fifo))
+        return *rstatus = 0;
+    if (link->status_out)
+        return *rstatus = link->status_out;
+    if (!link->status_in)
+        return *rstatus = 0;
+    *rstatus = link->status_out = link->status_in;
+    ff_update_link_current_pts(link, link->status_in_pts);
+    *rpts = link->current_pts;
+    return 1;
+}
+
 const AVClass *avfilter_get_class(void)
 {
     return &avfilter_class;