SDL

FindFFmpeg.cmake
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# - Try to find the required ffmpeg components(default: AVFORMAT, AVUTIL, AVCODEC)
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#
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# Once done this will define
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#  FFMPEG_FOUND         - System has the all required components.
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#  FFMPEG_LIBRARIES     - Link these to use the required ffmpeg components.
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#
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# For each of the components it will additionally set.
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#   - AVCODEC
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#   - AVDEVICE
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#   - AVFORMAT
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#   - AVFILTER
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#   - AVUTIL
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#   - POSTPROC
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#   - SWSCALE
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# the following target will be defined
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#  FFmpeg::SDL::<component>        - link to this target to
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# the following variables will be defined
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#  FFmpeg_<component>_FOUND        - System has <component>
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#  FFmpeg_<component>_INCLUDE_DIRS - Include directory necessary for using the <component> headers
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#  FFmpeg_<component>_LIBRARIES    - Link these to use <component>
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#  FFmpeg_<component>_DEFINITIONS  - Compiler switches required for using <component>
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#  FFmpeg_<component>_VERSION      - The components version
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#
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# Copyright (c) 2006, Matthias Kretz, <kretz@kde.org>
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# Copyright (c) 2008, Alexander Neundorf, <neundorf@kde.org>
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# Copyright (c) 2011, Michael Jansen, <kde@michael-jansen.biz>
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# Copyright (c) 2023, Sam lantinga, <slouken@libsdl.org>
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#
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# Redistribution and use is allowed according to the terms of the BSD license.
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# For details see the accompanying COPYING-CMAKE-SCRIPTS file.
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include(FindPackageHandleStandardArgs)
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include("${CMAKE_CURRENT_LIST_DIR}/PkgConfigHelper.cmake")
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# The default components were taken from a survey over other FindFFMPEG.cmake files
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if(NOT FFmpeg_FIND_COMPONENTS)
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  set(FFmpeg_FIND_COMPONENTS AVCODEC AVFORMAT AVUTIL)
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  foreach(_component IN LISTS FFmpeg_FIND_COMPONENTS)
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    set(FFmpeg_FIND_REQUIRED_${_component} TRUE)
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  endforeach()
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endif()
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find_package(PkgConfig QUIET)
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#
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### Macro: find_component
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#
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# Checks for the given component by invoking pkgconfig and then looking up the libraries and
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# include directories.
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#
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macro(find_component _component _pkgconfig _library _header)
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  # use pkg-config to get the directories and then use these values
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  # in the FIND_PATH() and FIND_LIBRARY() calls
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  if(PKG_CONFIG_FOUND)
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    pkg_check_modules(PC_${_component} QUIET ${_pkgconfig})
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  endif()
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  find_path(FFmpeg_${_component}_INCLUDE_DIRS
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    NAMES ${_header}
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    HINTS
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      ${PC_${_component}_INCLUDE_DIRS}
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    PATH_SUFFIXES
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      ffmpeg
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  )
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  find_library(FFmpeg_${_component}_LIBRARY
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    NAMES ${_library}
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    HINTS
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      ${PC_${_component}_LIBRARY_DIRS}
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  )
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  if(FFmpeg_${_component}_INCLUDE_DIRS AND FFmpeg_${_component}_LIBRARY)
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    set(FFmpeg_${_component}_FOUND TRUE)
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  endif()
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  if(PC_${_component}_FOUND)
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    get_flags_from_pkg_config("${FFmpeg_${_component}_LIBRARY}" "PC_${_component}" "${_component}")
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  endif()
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  set(FFmpeg_${_component}_VERSION "${PC_${_component}_VERSION}")
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  set(FFmpeg_${_component}_COMPILE_OPTIONS "${${_component}_options}" CACHE STRING "Extra compile options of FFmpeg ${_component}")
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  set(FFmpeg_${_component}_LIBRARIES "${${_component}_link_libraries}" CACHE STRING "Extra link libraries of FFmpeg ${_component}")
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  set(FFmpeg_${_component}_LINK_OPTIONS "${${_component}_link_options}" CACHE STRING "Extra link flags of FFmpeg ${_component}")
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  set(FFmpeg_${_component}_LINK_DIRECTORIES "${${_component}_link_directories}" CACHE PATH "Extra link directories of FFmpeg ${_component}")
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  mark_as_advanced(
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    FFmpeg_${_component}_INCLUDE_DIRS
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    FFmpeg_${_component}_LIBRARY
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    FFmpeg_${_component}_COMPILE_OPTIONS
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    FFmpeg_${_component}_LIBRARIES
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    FFmpeg_${_component}_LINK_OPTIONS
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    FFmpeg_${_component}_LINK_DIRECTORIES
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  )
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endmacro()
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# Check for all possible component.
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find_component(AVCODEC    libavcodec    avcodec  libavcodec/avcodec.h)
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find_component(AVFORMAT   libavformat   avformat libavformat/avformat.h)
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find_component(AVDEVICE   libavdevice   avdevice libavdevice/avdevice.h)
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find_component(AVUTIL     libavutil     avutil   libavutil/avutil.h)
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find_component(AVFILTER   libavfilter   avfilter libavfilter/avfilter.h)
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find_component(SWSCALE    libswscale    swscale  libswscale/swscale.h)
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find_component(POSTPROC   libpostproc   postproc libpostproc/postprocess.h)
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find_component(SWRESAMPLE libswresample swresample libswresample/swresample.h)
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# Compile the list of required vars
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set(_FFmpeg_REQUIRED_VARS)
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foreach(_component ${FFmpeg_FIND_COMPONENTS})
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  list(APPEND _FFmpeg_REQUIRED_VARS FFmpeg_${_component}_INCLUDE_DIRS FFmpeg_${_component}_LIBRARY)
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endforeach ()
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# Give a nice error message if some of the required vars are missing.
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find_package_handle_standard_args(FFmpeg DEFAULT_MSG ${_FFmpeg_REQUIRED_VARS})
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set(FFMPEG_LIBRARIES)
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if(FFmpeg_FOUND)
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  foreach(_component IN LISTS FFmpeg_FIND_COMPONENTS)
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    if(FFmpeg_${_component}_FOUND)
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      list(APPEND FFMPEG_LIBRARIES FFmpeg::SDL::${_component})
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      if(NOT TARGET FFmpeg::SDL::${_component})
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        add_library(FFmpeg::SDL::${_component} UNKNOWN IMPORTED)
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        set_target_properties(FFmpeg::SDL::${_component} PROPERTIES
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          IMPORTED_LOCATION "${FFmpeg_${_component}_LIBRARY}"
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          INTERFACE_INCLUDE_DIRECTORIES "${FFmpeg_${_component}_INCLUDE_DIRS}"
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          INTERFACE_COMPILE_OPTIONS "${FFmpeg_${_component}_COMPILE_OPTIONS}"
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          INTERFACE_LINK_LIBRARIES "${FFmpeg_${_component}_LIBRARIES}"
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          INTERFACE_LINK_OPTIONS "${FFmpeg_${_component}_LINK_OPTIONS}"
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          INTERFACE_LINK_DIRECTORIES "${FFmpeg_${_component}_LINK_DIRECTORIES}"
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        )
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      endif()
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    endif()
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  endforeach()
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endif()
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