AVFilterBufferRef *ff_get_video_buffer(AVFilterLink *link, int perms,
int w, int h);
-int ff_inplace_start_frame(AVFilterLink *link, AVFilterBufferRef *picref);
-int ff_null_start_frame(AVFilterLink *link, AVFilterBufferRef *picref);
-int ff_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir);
-int ff_null_end_frame(AVFilterLink *link);
-
/**
* Notify the next filter of the start of a frame.
*
*/
int ff_start_frame(AVFilterLink *link, AVFilterBufferRef *picref);
-/**
- * Pass video frame along and keep an internal reference for later use.
- */
-int ff_null_start_frame_keep_ref(AVFilterLink *inlink, AVFilterBufferRef *picref);
-
/**
* Notify the next filter that the current frame has finished.
*