Add Libfdk find module

cmake/Modules/FindLibfdk.cmake

@@ -0,0 +1,44 @@
+# Once done these will be defined:
+#
+#  LIBFDK_FOUND
+#  LIBFDK_INCLUDE_DIRS
+#  LIBFDK_LIBRARIES
+#
+
+if(LIBFDK_INCLUDE_DIRS AND LIBFDK_LIBRARIES)
+	set(LIBFDK_FOUND TRUE)
+else()
+	find_package(PkgConfig QUIET)
+	if (PKG_CONFIG_FOUND)
+		pkg_check_modules(_LIBFDK QUIET fdk-aac)
+	endif()
+
+	if(CMAKE_SIZEOF_VOID_P EQUAL 8)
+		set(_lib_suffix 64)
+	else()
+		set(_lib_suffix 32)
+	endif()
+
+	find_path(Libfdk_INCLUDE_DIR
+		NAMES fdk-aac/aacenc_lib.h
+		HINTS
+			ENV LibfdkPath
+			ENV FFmpegPath
+			${_LIBFDK_INCLUDE_DIRS}
+			/usr/include /usr/local/include /opt/local/include /sw/include)
+
+	find_library(Libfdk_LIB
+		NAMES libfdk-aac
+		HINTS
+			${Libfdk_INCLUDE_DIR}/../lib
+			${Libfdk_INCLUDE_DIR}/lib${_lib_suffix}
+			${_LIBFDK_LIBRARY_DIRS}
+			/usr/lib /usr/local/lib /opt/local/lib /sw/lib)
+
+	set(LIBFDK_INCLUDE_DIRS ${Libfdk_INCLUDE_DIR} CACHE PATH "Libfdk include dir")
+	set(LIBFDK_LIBRARIES ${Libfdk_LIB} CACHE STRING "Libfdk libraries")
+
+	find_package_handle_standard_args(Libfdk DEFAULT_MSG Libfdk_LIB Libfdk_INCLUDE_DIR)
+	mark_as_advanced(Libfdk_INCLUDE_DIR Libfdk_LIB)
+endif()
+