Rework link property configuration system.

This can now handle filters which are added to graphs out of order,
including auto-inserted scale filters.  As an added bonus, it can
now detect circular filter chains which wouldn't work anyway.

Commited in SoC by Bobby Bingham on 2007-12-24 03:22:10

Originally committed as revision 12073 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavfilter/defaults.c

@@ -104,16 +104,6 @@ int avfilter_default_config_output_link(AVFilterLink *link)
     return 0;
 }
 
-/**
- * default config_link() implementation for input video links to simplify
- * the implementation of one input one output video filters */
-int avfilter_default_config_input_link(AVFilterLink *link)
-{
-    if(!link->dst->output_count)
-        return 0;
-    return avfilter_config_link(link->dst->outputs[0]);
-}
-
 /**
  * A helper for query_formats() which sets all links to the same list of
  * formats. If there are no links hooked to this filter, the list of formats is