lavfi: remove request/poll and drawing functions from public API on next bump

They are only useful inside filters and we don't allow user filters for
now.

1 files changed, 35 insertions, 0 deletions

diff --git a/libavfilter/video.h b/libavfilter/video.h
index 2256482eee..7c9f9a0d28 100644
--- a/libavfilter/video.h
+++ b/libavfilter/video.h
@@ -29,4 +29,39 @@ void ff_null_start_frame(AVFilterLink *link, AVFilterBufferRef *picref);
 void ff_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir);
 void ff_null_end_frame(AVFilterLink *link);
 
+/**
+ * Notify the next filter of the start of a frame.
+ *
+ * @param link   the output link the frame will be sent over
+ * @param picref A reference to the frame about to be sent. The data for this
+ *               frame need only be valid once draw_slice() is called for that
+ *               portion. The receiving filter will free this reference when
+ *               it no longer needs it.
+ */
+void ff_start_frame(AVFilterLink *link, AVFilterBufferRef *picref);
+
+/**
+ * Notify the next filter that the current frame has finished.
+ *
+ * @param link the output link the frame was sent over
+ */
+void ff_end_frame(AVFilterLink *link);
+
+/**
+ * Send a slice to the next filter.
+ *
+ * Slices have to be provided in sequential order, either in
+ * top-bottom or bottom-top order. If slices are provided in
+ * non-sequential order the behavior of the function is undefined.
+ *
+ * @param link the output link over which the frame is being sent
+ * @param y    offset in pixels from the top of the image for this slice
+ * @param h    height of this slice in pixels
+ * @param slice_dir the assumed direction for sending slices,
+ *             from the top slice to the bottom slice if the value is 1,
+ *             from the bottom slice to the top slice if the value is -1,
+ *             for other values the behavior of the function is undefined.
+ */
+void ff_draw_slice(AVFilterLink *link, int y, int h, int slice_dir);
+
 #endif /* AVFILTER_VIDEO_H */