Make avfilter_get_video_buffer() use

avfilter_default_get_video_buffer() if the get_video_buffer() callback
is not defined in a filter.

Libavfilter filters author have to explicitely define the
get_video_buffer() callback if they want the buffer to be requested to
the filter following in the filterchain.

See the thread:
"[FFmpeg-devel] [PATCH] Make avfilter_get_video_buffer() use
default_get_video_buffer if callback not defined".

Originally committed as revision 20444 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavfilter/avfilter.c

@@ -188,9 +188,6 @@ AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms, int w,
     if(link_dpad(link).get_video_buffer)
         ret = link_dpad(link).get_video_buffer(link, perms, w, h);
 
-    if(!ret && link->dst->output_count)
-        ret = avfilter_get_video_buffer(link->dst->outputs[0], perms, w, h);
-
     if(!ret)
         ret = avfilter_default_get_video_buffer(link, perms, w, h);
 

libavfilter/avfilter.h

@@ -24,7 +24,7 @@
 
 #define LIBAVFILTER_VERSION_MAJOR  1
 #define LIBAVFILTER_VERSION_MINOR  6
-#define LIBAVFILTER_VERSION_MICRO  0
+#define LIBAVFILTER_VERSION_MICRO  1
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
                                                LIBAVFILTER_VERSION_MINOR, \
@@ -288,7 +288,7 @@ struct AVFilterPad
 
     /**
      * Callback function to get a buffer. If NULL, the filter system will
-     * handle buffer requests.
+     * use avfilter_default_get_video_buffer().
      *
      * Input video pads only.
      */