[gdal-dev] GDAL equivalent of ArcGIS's focal statistics raster interpolation?

[m k]

Much of my GIS vocabulary comes from ArcGIS. ArcGIS has a Spatial Analyst Tool called Focal Statistics. It basically "blurs" the raster by redefining cells based on a search area (either circle or square), and the values that occur in these surroundings (you can also control how big the area is with a parameter). I've found this process useful to prepare a raster for hillshading.
I am wondering if there is an equivalent tool in the GDAL library?
Thank you
-m 		 	   		  
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