added avresample cmake module

cmake/FindAVResample.cmake

@@ -0,0 +1,44 @@
+# - Try to find libav libavresample
+# Once done, this will define
+#
+#  AVResample_FOUND - the library is available
+#  AVResample_INCLUDE_DIRS - the include directories
+#  AVResample_LIBRARIES - the libraries
+#  AVResample_INCLUDE - the file to #include (may be used in config.h)
+#
+# See documentation on how to write CMake scripts at
+# http://www.cmake.org/Wiki/CMake:How_To_Find_Libraries
+
+include(LibFindMacros)
+
+libfind_package(AVResample AVUtil)
+
+
+
+libfind_pkg_check_modules(AVResample_PKGCONF libavresample)
+
+find_path(AVResample_INCLUDE_DIR
+  NAMES libavresample/avresample.h ffmpeg/avresample.h avresample.h
+  PATHS ${AVResample_PKGCONF_INCLUDE_DIRS}
+  PATH_SUFFIXES ffmpeg
+)
+if(AVResample_INCLUDE_DIR)
+  foreach(suffix libavresample/ ffmpeg/ "")
+    if(NOT AVResample_INCLUDE)
+      if(EXISTS "${AVResample_INCLUDE_DIR}/${suffix}avresample.h")
+        set(AVResample_INCLUDE "${suffix}avresample.h")
+      endif(EXISTS "${AVResample_INCLUDE_DIR}/${suffix}avresample.h")
+    endif(NOT AVResample_INCLUDE)
+  endforeach(suffix)
+
+    if(NOT AVResample_INCLUDE)
+    message(FATAL_ERROR "Found avresample.h include dir, but not the header file. Perhaps you need to clear CMake cache?")
+  endif(NOT AVResample_INCLUDE)
+endif(AVResample_INCLUDE_DIR)
+
+find_library(AVResample_LIBRARY
+  NAMES libavresample.dll.a avresample
+  PATHS ${AVResample_PKGCONF_LIBRARY_DIRS}
+)
+
+libfind_process(AVResample)