obs-studio/cmake/Modules/FindLibfdk.cmake

# Once done these will be defined:
#
# LIBFDK_FOUND LIBFDK_INCLUDE_DIRS LIBFDK_LIBRARIES
#
# For use in OBS:
#
# Libfdk_INCLUDE_DIR

find_package(PkgConfig QUIET)
if(PKG_CONFIG_FOUND)
  pkg_check_modules(_LIBFDK 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 LIBFDK_PATH ${LIBFDK_PATH} ${CMAKE_SOURCE_DIR}/${LIBFDK_PATH}
        ${_LIBFDK_INCLUDE_DIRS}
  PATHS /usr/include /usr/local/include /opt/local/include /sw/include
  PATH_SUFFIXES include)

find_library(
  Libfdk_LIB
  NAMES ${_LIBFDK_LIBRARIES} fdk-aac libfdk-aac
  HINTS ENV LIBFDK_PATH ${LIBFDK_PATH} ${CMAKE_SOURCE_DIR}/${LIBFDK_PATH}
        ${_LIBFDK_LIBRARY_DIRS}
  PATHS /usr/lib /usr/local/lib /opt/local/lib /sw/lib
  PATH_SUFFIXES
    lib${_lib_suffix}
    lib
    libs${_lib_suffix}
    libs
    bin${_lib_suffix}
    bin
    ../lib${_lib_suffix}
    ../lib
    ../libs${_lib_suffix}
    ../libs
    ../bin${_lib_suffix}
    ../bin)

include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(Libfdk DEFAULT_MSG Libfdk_LIB
                                  Libfdk_INCLUDE_DIR)
mark_as_advanced(Libfdk_INCLUDE_DIR Libfdk_LIB)

if(LIBFDK_FOUND)
  set(LIBFDK_INCLUDE_DIRS ${Libfdk_INCLUDE_DIR})
  set(LIBFDK_LIBRARIES ${Libfdk_LIB})

  if(NOT TARGET LibFDK::LibFDK)
    if(IS_ABSOLUTE "${LIBFDK_LIBRARIES}")
      add_library(LibFDK::LibFDK UNKNOWN IMPORTED)
      set_target_properties(LibFDK::LibFDK PROPERTIES IMPORTED_LOCATION
                                                      "${LIBFDK_LIBRARIES}")
    else()
      add_library(LibFDK::LibFDK INTERFACE IMPORTED)
      set_target_properties(LibFDK::LibFDK PROPERTIES IMPORTED_LIBNAME
                                                      "${LIBFDK_LIBRARIES}")
    endif()

    set_target_properties(
      LibFDK::LibFDK PROPERTIES INTERFACE_INCLUDE_DIRECTORIES
                                "${LIBFDK_INCLUDE_DIRS}")
  endif()

endif()