Build: Add CMake package module for FFmpeg
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Peter Keresztes Schmidt
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#[=======================================================================[.rst:
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FindFFMPEG
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----------
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Find the FFmpeg and associated libraries.
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This module accepts following COMPONENTS::
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avcodec
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avdevice
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avfilter
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avformat
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avutil
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swresample
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swscale
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avresample
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IMPORTED Targets
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^^^^^^^^^^^^^^^^
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This module defines the following :prop_tgt:`IMPORTED` targets:
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``FFMPEG::<component>``
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The FFmpeg component.
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Result Variables
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^^^^^^^^^^^^^^^^
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``FFMPEG_INCLUDE_DIRS``
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Include directories necessary to use FFmpeg.
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``FFMPEG_LIBRARIES``
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Libraries necessary to use FFmpeg. Note that this only includes libraries for the components requested.
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``FFMPEG_VERSION``
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The version of FFMPEG found (avutil).
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For each component, the following are provided:
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``FFMPEG_<component>_FOUND``
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FFmpeg component was found.
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``FFMPEG_<component>_INCLUDE_DIRS``
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Include directories for the component.
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``FFMPEG_<component>_LIBRARIES``
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Libraries for the component.
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#]=======================================================================]
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function(_ffmpeg_find component pkgconfig_name header)
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find_package(PkgConfig)
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pkg_check_modules(PC_FFMPEG_${component} ${pkgconfig_name})
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find_path(FFMPEG_${component}_INCLUDE_DIR
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NAMES "lib${component}/${header}"
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HINTS
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${PC_FFMPEG_${component}_INCLUDEDIR}
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${PC_FFMPEG_${component}_INCLUDE_DIRS}
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PATH_SUFFIXES
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ffmpeg)
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mark_as_advanced("FFMPEG_${component}_INCLUDE_DIR")
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find_library(FFMPEG_${component}_LIBRARY
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NAMES
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${component}
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${PC_FFMPEG_${component}_LIBRARIES}
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HINTS
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${PC_FFMPEG_${component}_LIBDIR}
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${PC_FFMPEG_${component}_LIBRARY_DIRS})
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mark_as_advanced("${component}_LIBRARY")
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if(FFMPEG_${component}_LIBRARY AND FFMPEG_${component}_INCLUDE_DIR)
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set(_deps_found TRUE)
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set(_deps_link)
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foreach(_ffmpeg_dep IN LISTS ARGN)
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if(TARGET "FFMPEG::${_ffmpeg_dep}")
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list(APPEND _deps_link "FFMPEG::${_ffmpeg_dep}")
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else()
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set(_deps_found FALSE)
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endif()
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endforeach()
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if(_deps_found)
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if(NOT TARGET "FFMPEG::${component}")
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add_library("FFMPEG::${component}" UNKNOWN IMPORTED)
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set_target_properties("FFMPEG::${component}" PROPERTIES
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IMPORTED_LOCATION "${FFMPEG_${component}_LIBRARY}"
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INTERFACE_INCLUDE_DIRECTORIES "${FFMPEG_${component}_INCLUDE_DIR}"
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IMPORTED_LINK_INTERFACE_LIBRARIES "${_deps_link}")
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endif()
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set(FFMPEG_${component}_FOUND 1 PARENT_SCOPE)
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set(FFMPEG_${component}_VERSION "${PC_FFMPEG_${component}_VERSION}" PARENT_SCOPE)
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else()
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set("FFMPEG_${component}_FOUND" 0 PARENT_SCOPE)
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set(what)
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if(NOT FFMPEG_${component}_LIBRARY)
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set(what "library")
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endif()
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if(NOT FFMPEG_${component}_INCLUDE_DIR)
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if(what)
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string(APPEND what " or headers")
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else()
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set(what "headers")
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endif()
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endif()
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set("FFMPEG_${component}_NOT_FOUND_MESSAGE"
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"Could not find the ${what} for ${component}."
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PARENT_SCOPE)
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endif()
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endif()
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endfunction()
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_ffmpeg_find(avutil libavutil avutil.h)
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_ffmpeg_find(swresample libswresample swresample.h
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avutil)
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_ffmpeg_find(swscale libswscale swscale.h
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avutil)
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_ffmpeg_find(avcodec libavcodec avcodec.h
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avutil)
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_ffmpeg_find(avformat libavformat avformat.h
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avcodec avutil)
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_ffmpeg_find(avfilter libavfilter avfilter.h
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avutil)
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_ffmpeg_find(avdevice libavdevice avdevice.h
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avformat avutil)
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_ffmpeg_find(avresample libavresample avresample.h
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avutil)
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if(TARGET FFMPEG::avutil)
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set(FFMPEG_VERSION "${FFMPEG_avutil_VERSION}")
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endif()
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set(FFMPEG_INCLUDE_DIRS)
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set(FFMPEG_LIBRARIES)
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set(_ffmpeg_required_vars)
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foreach(_ffmpeg_component IN LISTS FFMPEG_FIND_COMPONENTS)
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if(TARGET "FFMPEG::${_ffmpeg_component}")
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set(FFMPEG_${_ffmpeg_component}_INCLUDE_DIRS
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"${FFMPEG_${_ffmpeg_component}_INCLUDE_DIR}")
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set(FFMPEG_${_ffmpeg_component}_LIBRARIES
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"${FFMPEG_${_ffmpeg_component}_LIBRARY}")
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list(APPEND FFMPEG_INCLUDE_DIRS
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"${FFMPEG_${_ffmpeg_component}_INCLUDE_DIRS}")
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list(APPEND FFMPEG_LIBRARIES
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"${FFMPEG_${_ffmpeg_component}_LIBRARIES}")
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if(FFMEG_FIND_REQUIRED_${_ffmpeg_component})
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list(APPEND _ffmpeg_required_vars
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"FFMPEG_${_ffmpeg_required_vars}_INCLUDE_DIRS"
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"FFMPEG_${_ffmpeg_required_vars}_LIBRARIES")
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endif()
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endif()
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endforeach()
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unset(_ffmpeg_component)
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if(FFMPEG_INCLUDE_DIRS)
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list(REMOVE_DUPLICATES FFMPEG_INCLUDE_DIRS)
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endif()
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include(FindPackageHandleStandardArgs)
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find_package_handle_standard_args(FFMPEG
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REQUIRED_VARS
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FFMPEG_INCLUDE_DIRS
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FFMPEG_LIBRARIES
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${_ffmpeg_required_vars}
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VERSION_VAR
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FFMPEG_VERSION
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HANDLE_COMPONENTS)
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unset(_ffmpeg_required_vars)
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@ -23,7 +23,7 @@ Result Variables
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``LIBJWT_FOUND``
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System has libjwt
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``LIBJWT_INCLUDE_DIR``
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``LIBJWT_INCLUDE_DIRS``
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The libjwt include directory
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``LIBJWT_LIBRARIES``
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The libraries needed to use libjwt
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