vcpkg_from_github(
    OUT_SOURCE_PATH SOURCE_PATH
    REPO ffmpeg/ffmpeg
    REF "n${VERSION}"
    SHA512 c72f4062aecc16d8b2b1e8678d5efe3af4cfaa0cc7c0997052248f9e499e60c2463acf07877cf3b78b246ce3e8078cb043e8d97e90a6b50d06af32ff7369a788
    HEAD_REF master
    PATCHES
        0002-fix-msvc-link.patch
        0003-fix-windowsinclude.patch
        0004-dependencies.patch
        0005-fix-nasm.patch
        0007-fix-lib-naming.patch
        0013-define-WINVER.patch
        0024-fix-osx-host-c11.patch
        0040-ffmpeg-add-av_stream_get_first_dts-for-chromium.patch # Do not remove this patch. It is required by chromium
        0045-use-prebuilt-bin2c.patch
        0046-fix-msvc-detection.patch
        0047-fix-msvc-utf8.patch
        0048-backport-23039.patch
        0049-fix-twolame-pkgconfig.patch
        0050-fix-test-ld-absolute-lib-paths.patch
)

if(SOURCE_PATH MATCHES " ")
    message(FATAL_ERROR "Error: ffmpeg will not build with spaces in the path. Please use a directory with no spaces")
endif()

vcpkg_add_to_path(PREPEND "${CURRENT_HOST_INSTALLED_DIR}/manual-tools/ffmpeg-bin2c")

if (VCPKG_TARGET_ARCHITECTURE STREQUAL "x86" OR VCPKG_TARGET_ARCHITECTURE STREQUAL "x64")
    vcpkg_find_acquire_program(NASM)
    get_filename_component(NASM_EXE_PATH "${NASM}" DIRECTORY)
    vcpkg_add_to_path("${NASM_EXE_PATH}")
endif()

set(OPTIONS "--enable-pic --disable-doc --enable-runtime-cpudetect --disable-autodetect")

if(VCPKG_TARGET_IS_MINGW)
    if(VCPKG_TARGET_ARCHITECTURE STREQUAL "x86")
        string(APPEND OPTIONS " --target-os=mingw32")
    elseif(VCPKG_TARGET_ARCHITECTURE STREQUAL "x64")
        string(APPEND OPTIONS " --target-os=mingw64")
    endif()
elseif(VCPKG_TARGET_IS_LINUX)
    string(APPEND OPTIONS " --target-os=linux --enable-pthreads")
elseif(VCPKG_TARGET_IS_UWP)
    string(APPEND OPTIONS " --target-os=win32 --enable-w32threads --enable-d3d11va --enable-d3d12va --enable-mediafoundation")
elseif(VCPKG_TARGET_IS_WINDOWS)
    string(APPEND OPTIONS " --target-os=win32 --enable-w32threads --enable-d3d11va --enable-d3d12va --enable-dxva2 --enable-mediafoundation")
elseif(VCPKG_TARGET_IS_OSX)
    string(APPEND OPTIONS " --target-os=darwin --enable-appkit --enable-avfoundation --enable-coreimage --enable-audiotoolbox --enable-videotoolbox")
elseif(VCPKG_TARGET_IS_IOS)
    string(APPEND OPTIONS " --enable-avfoundation --enable-coreimage --enable-videotoolbox")
elseif(VCPKG_CMAKE_SYSTEM_NAME STREQUAL "Android")
    string(APPEND OPTIONS " --target-os=android --enable-jni --enable-mediacodec")
elseif(VCPKG_CMAKE_SYSTEM_NAME STREQUAL "QNX")
    string(APPEND OPTIONS " --target-os=qnx")
endif()

if(VCPKG_TARGET_IS_OSX)
    list(JOIN VCPKG_OSX_ARCHITECTURES " " OSX_ARCHS)
    list(LENGTH VCPKG_OSX_ARCHITECTURES OSX_ARCH_COUNT)
endif()

vcpkg_cmake_get_vars(cmake_vars_file)
include("${cmake_vars_file}")
if(VCPKG_DETECTED_MSVC)
    set(OPTIONS "--toolchain=msvc ${OPTIONS}")
    # This is required because ffmpeg depends upon optimizations to link correctly
    string(APPEND VCPKG_COMBINED_C_FLAGS_DEBUG " -O2")
    string(REGEX REPLACE "(^| )-RTC1( |$)" " " VCPKG_COMBINED_C_FLAGS_DEBUG "${VCPKG_COMBINED_C_FLAGS_DEBUG}")
    string(REGEX REPLACE "(^| )-Od( |$)" " " VCPKG_COMBINED_C_FLAGS_DEBUG "${VCPKG_COMBINED_C_FLAGS_DEBUG}")
    string(REGEX REPLACE "(^| )-Ob0( |$)" " " VCPKG_COMBINED_C_FLAGS_DEBUG "${VCPKG_COMBINED_C_FLAGS_DEBUG}")
endif()

string(APPEND VCPKG_COMBINED_C_FLAGS_DEBUG " -I \"${CURRENT_INSTALLED_DIR}/include\"")
string(APPEND VCPKG_COMBINED_C_FLAGS_RELEASE " -I \"${CURRENT_INSTALLED_DIR}/include\"")

## Setup vcpkg toolchain

set(prog_env "")

if(VCPKG_DETECTED_CMAKE_C_COMPILER)
    get_filename_component(CC_path "${VCPKG_DETECTED_CMAKE_C_COMPILER}" DIRECTORY)
    get_filename_component(CC_filename "${VCPKG_DETECTED_CMAKE_C_COMPILER}" NAME)
    set(ENV{CC} "${CC_filename}")
    string(APPEND OPTIONS " --cc=${CC_filename}")
    list(APPEND prog_env "${CC_path}")
endif()

if(VCPKG_DETECTED_CMAKE_CXX_COMPILER)
    get_filename_component(CXX_path "${VCPKG_DETECTED_CMAKE_CXX_COMPILER}" DIRECTORY)
    get_filename_component(CXX_filename "${VCPKG_DETECTED_CMAKE_CXX_COMPILER}" NAME)
    set(ENV{CXX} "${CXX_filename}")
    string(APPEND OPTIONS " --cxx=${CXX_filename}")
    list(APPEND prog_env "${CXX_path}")
endif()

if(VCPKG_DETECTED_CMAKE_RC_COMPILER)
    get_filename_component(RC_path "${VCPKG_DETECTED_CMAKE_RC_COMPILER}" DIRECTORY)
    get_filename_component(RC_filename "${VCPKG_DETECTED_CMAKE_RC_COMPILER}" NAME)
    set(ENV{WINDRES} "${RC_filename}")
    string(APPEND OPTIONS " --windres=${RC_filename}")
    list(APPEND prog_env "${RC_path}")
endif()

if(VCPKG_DETECTED_CMAKE_LINKER AND VCPKG_TARGET_IS_WINDOWS AND NOT VCPKG_TARGET_IS_MINGW)
    get_filename_component(LD_path "${VCPKG_DETECTED_CMAKE_LINKER}" DIRECTORY)
    get_filename_component(LD_filename "${VCPKG_DETECTED_CMAKE_LINKER}" NAME)
    set(ENV{LD} "${LD_filename}")
    string(APPEND OPTIONS " --ld=${LD_filename}")
    list(APPEND prog_env "${LD_path}")
endif()

if(VCPKG_DETECTED_CMAKE_NM)
    get_filename_component(NM_path "${VCPKG_DETECTED_CMAKE_NM}" DIRECTORY)
    get_filename_component(NM_filename "${VCPKG_DETECTED_CMAKE_NM}" NAME)
    set(ENV{NM} "${NM_filename}")
    string(APPEND OPTIONS " --nm=${NM_filename}")
    list(APPEND prog_env "${NM_path}")
endif()

if(VCPKG_DETECTED_CMAKE_AR)
    get_filename_component(AR_path "${VCPKG_DETECTED_CMAKE_AR}" DIRECTORY)
    get_filename_component(AR_filename "${VCPKG_DETECTED_CMAKE_AR}" NAME)
    if(AR_filename MATCHES [[^(llvm-)?lib\.exe$]])
        set(ENV{AR} "ar-lib ${AR_filename}")
        string(APPEND OPTIONS " --ar='ar-lib ${AR_filename}'")
    else()
        set(ENV{AR} "${AR_filename}")
        string(APPEND OPTIONS " --ar='${AR_filename}'")
    endif()
    list(APPEND prog_env "${AR_path}")
endif()

if(VCPKG_DETECTED_CMAKE_RANLIB)
    get_filename_component(RANLIB_path "${VCPKG_DETECTED_CMAKE_RANLIB}" DIRECTORY)
    get_filename_component(RANLIB_filename "${VCPKG_DETECTED_CMAKE_RANLIB}" NAME)
    set(ENV{RANLIB} "${RANLIB_filename}")
    string(APPEND OPTIONS " --ranlib=${RANLIB_filename}")
    list(APPEND prog_env "${RANLIB_path}")
endif()

if(VCPKG_DETECTED_CMAKE_STRIP)
    get_filename_component(STRIP_path "${VCPKG_DETECTED_CMAKE_STRIP}" DIRECTORY)
    get_filename_component(STRIP_filename "${VCPKG_DETECTED_CMAKE_STRIP}" NAME)
    set(ENV{STRIP} "${STRIP_filename}")
    string(APPEND OPTIONS " --strip=${STRIP_filename}")
    list(APPEND prog_env "${STRIP_path}")
endif()

if(VCPKG_HOST_IS_WINDOWS)
    vcpkg_acquire_msys(MSYS_ROOT PACKAGES automake)
    set(SHELL "${MSYS_ROOT}/usr/bin/bash.exe")
    vcpkg_execute_required_process(
        COMMAND "${SHELL}" -c "'/usr/bin/automake' --print-lib"
        OUTPUT_VARIABLE automake_lib
        OUTPUT_STRIP_TRAILING_WHITESPACE
        WORKING_DIRECTORY "${MSYS_ROOT}"
        LOGNAME automake-print-lib
    )
    list(APPEND prog_env "${MSYS_ROOT}/usr/bin" "${MSYS_ROOT}${automake_lib}")
else()
    find_program(SHELL bash)
endif()

list(REMOVE_DUPLICATES prog_env)
vcpkg_add_to_path(PREPEND ${prog_env})

# More? OBJCC BIN2C

file(REMOVE_RECURSE "${CURRENT_BUILDTREES_DIR}/${TARGET_TRIPLET}-dbg" "${CURRENT_BUILDTREES_DIR}/${TARGET_TRIPLET}-rel")

set(FFMPEG_PKGCONFIG_MODULES libavutil)

if("nonfree" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-nonfree")
endif()

if("gpl" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-gpl")
endif()

if("version3" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-version3")
endif()

if("ffmpeg" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-ffmpeg")
else()
    set(OPTIONS "${OPTIONS} --disable-ffmpeg")
endif()

if("ffplay" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-ffplay")
else()
    set(OPTIONS "${OPTIONS} --disable-ffplay")
endif()

if("ffprobe" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-ffprobe")
else()
    set(OPTIONS "${OPTIONS} --disable-ffprobe")
endif()

if("avcodec" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-avcodec")
    set(ENABLE_AVCODEC ON)
    list(APPEND FFMPEG_PKGCONFIG_MODULES libavcodec)
else()
    set(OPTIONS "${OPTIONS} --disable-avcodec")
    set(ENABLE_AVCODEC OFF)
endif()

if("avdevice" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-avdevice")
    set(ENABLE_AVDEVICE ON)
    list(APPEND FFMPEG_PKGCONFIG_MODULES libavdevice)
else()
    set(OPTIONS "${OPTIONS} --disable-avdevice")
    set(ENABLE_AVDEVICE OFF)
endif()

if("avformat" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-avformat")
    set(ENABLE_AVFORMAT ON)
    list(APPEND FFMPEG_PKGCONFIG_MODULES libavformat)
else()
    set(OPTIONS "${OPTIONS} --disable-avformat")
    set(ENABLE_AVFORMAT OFF)
endif()

if("avfilter" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-avfilter")
    set(ENABLE_AVFILTER ON)
    list(APPEND FFMPEG_PKGCONFIG_MODULES libavfilter)
else()
    set(OPTIONS "${OPTIONS} --disable-avfilter")
    set(ENABLE_AVFILTER OFF)
endif()

if("swresample" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-swresample")
    set(ENABLE_SWRESAMPLE ON)
    list(APPEND FFMPEG_PKGCONFIG_MODULES libswresample)
else()
    set(OPTIONS "${OPTIONS} --disable-swresample")
    set(ENABLE_SWRESAMPLE OFF)
endif()

if("swscale" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-swscale")
    set(ENABLE_SWSCALE ON)
    list(APPEND FFMPEG_PKGCONFIG_MODULES libswscale)
else()
    set(OPTIONS "${OPTIONS} --disable-swscale")
    set(ENABLE_SWSCALE OFF)
endif()

if ("alsa" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-alsa")
else()
    set(OPTIONS "${OPTIONS} --disable-alsa")
endif()

if("amf" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-amf")
else()
    set(OPTIONS "${OPTIONS} --disable-amf")
endif()

if("aom" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-libaom")
    set(WITH_AOM ON)
else()
    set(OPTIONS "${OPTIONS} --disable-libaom")
    set(WITH_AOM OFF)
endif()

if("ass" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-libass")
    set(WITH_ASS ON)
else()
    set(OPTIONS "${OPTIONS} --disable-libass")
    set(WITH_ASS OFF)
endif()

if("avisynthplus" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-avisynth")
else()
    set(OPTIONS "${OPTIONS} --disable-avisynth")
endif()

if("bzip2" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-bzlib")
else()
    set(OPTIONS "${OPTIONS} --disable-bzlib")
endif()

if("dav1d" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-libdav1d")
    set(WITH_DAV1D ON)
else()
    set(OPTIONS "${OPTIONS} --disable-libdav1d")
    set(WITH_DAV1D OFF)
endif()

if("fdk-aac" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-libfdk-aac")
    set(WITH_AAC ON)
else()
    set(OPTIONS "${OPTIONS} --disable-libfdk-aac")
    set(WITH_AAC OFF)
endif()

if("fontconfig" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-libfontconfig")
else()
    set(OPTIONS "${OPTIONS} --disable-libfontconfig")
endif()

if("drawtext" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-libharfbuzz")
else()
    set(OPTIONS "${OPTIONS} --disable-libharfbuzz")
endif()

if("freetype" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-libfreetype")
else()
    set(OPTIONS "${OPTIONS} --disable-libfreetype")
endif()

if("fribidi" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-libfribidi")
else()
    set(OPTIONS "${OPTIONS} --disable-libfribidi")
endif()

if("iconv" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-iconv")
    set(WITH_ICONV ON)
else()
    set(OPTIONS "${OPTIONS} --disable-iconv")
    set(WITH_ICONV OFF)
endif()

if("ilbc" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-libilbc")
    set(WITH_ILBC ON)
else()
    set(OPTIONS "${OPTIONS} --disable-libilbc")
    set(WITH_ILBC OFF)
endif()

if("lzma" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-lzma")
    set(WITH_LZMA ON)
else()
    set(OPTIONS "${OPTIONS} --disable-lzma")
    set(WITH_LZMA OFF)
endif()

if("mp3lame" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-libmp3lame")
    set(WITH_MP3LAME ON)
else()
    set(OPTIONS "${OPTIONS} --disable-libmp3lame")
    set(WITH_MP3LAME OFF)
endif()

if("modplug" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-libmodplug")
    set(WITH_MODPLUG ON)
else()
    set(OPTIONS "${OPTIONS} --disable-libmodplug")
    set(WITH_MODPLUG OFF)
endif()

if("nvcodec" IN_LIST FEATURES)
    #Note: the --enable-cuda option does not actually require the cuda sdk or toolset port dependency as ffmpeg uses runtime detection and dynamic loading
    set(OPTIONS "${OPTIONS} --enable-cuda --enable-nvenc --enable-nvdec --enable-cuvid --enable-ffnvcodec")
else()
    set(OPTIONS "${OPTIONS} --disable-cuda --disable-nvenc --disable-nvdec  --disable-cuvid --disable-ffnvcodec")
endif()

if("opencl" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-opencl")
    set(WITH_OPENCL ON)
else()
    set(OPTIONS "${OPTIONS} --disable-opencl")
    set(WITH_OPENCL OFF)
endif()

if("opengl" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-opengl")
else()
    set(OPTIONS "${OPTIONS} --disable-opengl")
endif()

if("openh264" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-libopenh264")
    set(WITH_OPENH264 ON)
else()
    set(OPTIONS "${OPTIONS} --disable-libopenh264")
    set(WITH_OPENH264 OFF)
endif()

if("openjpeg" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-libopenjpeg")
    set(WITH_OPENJPEG ON)
else()
    set(OPTIONS "${OPTIONS} --disable-libopenjpeg")
    set(WITH_OPENJPEG OFF)
endif()

if("openmpt" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-libopenmpt")
    set(WITH_OPENMPT ON)
else()
    set(OPTIONS "${OPTIONS} --disable-libopenmpt")
    set(WITH_OPENMPT OFF)
endif()

set(WITH_OPENSSL OFF)
set(WITH_SCHANNEL OFF)
if("openssl" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-openssl")
    set(WITH_OPENSSL ON)
else()
    set(OPTIONS "${OPTIONS} --disable-openssl")
    if(VCPKG_TARGET_IS_WINDOWS AND NOT VCPKG_TARGET_IS_UWP)
        string(APPEND OPTIONS " --enable-schannel")
        set(WITH_SCHANNEL ON)
    endif()
endif()

if("opus" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-libopus")
    set(WITH_OPUS ON)
else()
    set(OPTIONS "${OPTIONS} --disable-libopus")
    set(WITH_OPUS OFF)
endif()

if("sdl2" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-sdl2")
else()
    set(OPTIONS "${OPTIONS} --disable-sdl2")
endif()

if("snappy" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-libsnappy")
    set(WITH_SNAPPY ON)
else()
    set(OPTIONS "${OPTIONS} --disable-libsnappy")
    set(WITH_SNAPPY OFF)
endif()

if("soxr" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-libsoxr")
    set(WITH_SOXR ON)
else()
    set(OPTIONS "${OPTIONS} --disable-libsoxr")
    set(WITH_SOXR OFF)
endif()

if("speex" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-libspeex")
    set(WITH_SPEEX ON)
else()
    set(OPTIONS "${OPTIONS} --disable-libspeex")
    set(WITH_SPEEX OFF)
endif()

if("ssh" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-libssh")
    set(WITH_SSH ON)
else()
    set(OPTIONS "${OPTIONS} --disable-libssh")
    set(WITH_SSH OFF)
endif()

if("tensorflow" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-libtensorflow")
else()
    set(OPTIONS "${OPTIONS} --disable-libtensorflow")
endif()

if("tesseract" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-libtesseract")
else()
    set(OPTIONS "${OPTIONS} --disable-libtesseract")
endif()

if("theora" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-libtheora")
    set(WITH_THEORA ON)
else()
    set(OPTIONS "${OPTIONS} --disable-libtheora")
    set(WITH_THEORA OFF)
endif()

if("twolame" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-libtwolame")
    set(WITH_TWOLAME ON)
else()
    set(OPTIONS "${OPTIONS} --disable-libtwolame")
    set(WITH_TWOLAME OFF)
endif()

if("vorbis" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-libvorbis")
    set(WITH_VORBIS ON)
else()
    set(OPTIONS "${OPTIONS} --disable-libvorbis")
    set(WITH_VORBIS OFF)
endif()

if("vpx" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-libvpx")
    set(WITH_VPX ON)
else()
    set(OPTIONS "${OPTIONS} --disable-libvpx")
    set(WITH_VPX OFF)
endif()

if("vulkan" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-vulkan")
else()
    set(OPTIONS "${OPTIONS} --disable-vulkan")
endif()

if("webp" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-libwebp")
    set(WITH_WEBP ON)
else()
    set(OPTIONS "${OPTIONS} --disable-libwebp")
    set(WITH_WEBP OFF)
endif()

if("x264" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-libx264")
    set(WITH_X264 ON)
else()
    set(OPTIONS "${OPTIONS} --disable-libx264")
    set(WITH_X264 OFF)
endif()

if("x265" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-libx265")
    set(WITH_X265 ON)
else()
    set(OPTIONS "${OPTIONS} --disable-libx265")
    set(WITH_X265 OFF)
endif()

if("xml2" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-libxml2")
    set(WITH_XML2 ON)
else()
    set(OPTIONS "${OPTIONS} --disable-libxml2")
    set(WITH_XML2 OFF)
endif()

if("zlib" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-zlib")
else()
    set(OPTIONS "${OPTIONS} --disable-zlib")
endif()

if ("srt" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-libsrt")
    set(WITH_SRT ON)
else()
    set(OPTIONS "${OPTIONS} --disable-libsrt")
    set(WITH_SRT OFF)
endif()

if ("qsv" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-libvpl --enable-encoder=h264_qsv --enable-decoder=h264_qsv")
    set(WITH_VPL ON)
else()
    set(OPTIONS "${OPTIONS} --disable-libvpl")
    set(WITH_VPL OFF)
endif()

if ("vaapi" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-vaapi")
    set(WITH_VAAPI ON)
else()
    set(OPTIONS "${OPTIONS} --disable-vaapi")
    set(WITH_VAAPI OFF)
endif()

if("zmq" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-libzmq")
    set(WITH_ZMQ ON)
else()
    set(OPTIONS "${OPTIONS} --disable-libzmq")
    set(WITH_ZMQ OFF)
endif()

if("rubberband" IN_LIST FEATURES)
    set(OPTIONS "${OPTIONS} --enable-librubberband")
    set(WITH_RUBBERBAND ON)
else()
    set(OPTIONS "${OPTIONS} --disable-librubberband")
    set(WITH_RUBBERBAND OFF)
endif()

set(OPTIONS_CROSS "--enable-cross-compile")

# ffmpeg needs --cross-prefix option to use appropriate tools for cross-compiling.
if(VCPKG_DETECTED_CMAKE_C_COMPILER MATCHES "([^\/]*-)gcc$")
    string(APPEND OPTIONS_CROSS " --cross-prefix=${CMAKE_MATCH_1}")
endif()

if(VCPKG_TARGET_ARCHITECTURE STREQUAL "x64")
    set(BUILD_ARCH "x86_64")
else()
    set(BUILD_ARCH ${VCPKG_TARGET_ARCHITECTURE})
endif()

if (VCPKG_TARGET_ARCHITECTURE STREQUAL "arm" OR VCPKG_TARGET_ARCHITECTURE STREQUAL "arm64")
    if(VCPKG_TARGET_IS_WINDOWS)
        vcpkg_find_acquire_program(GASPREPROCESSOR)
        foreach(GAS_PATH ${GASPREPROCESSOR})
            get_filename_component(GAS_ITEM_PATH ${GAS_PATH} DIRECTORY)
            vcpkg_add_to_path("${GAS_ITEM_PATH}")
        endforeach(GAS_PATH)
    endif()
endif()

if(VCPKG_TARGET_IS_UWP)
    set(ENV{LIBPATH} "$ENV{LIBPATH};$ENV{_WKITS10}references\\windows.foundation.foundationcontract\\2.0.0.0\\;$ENV{_WKITS10}references\\windows.foundation.universalapicontract\\3.0.0.0\\")
    string(APPEND OPTIONS " --disable-programs")
    string(APPEND OPTIONS " --disable-filter=gfxcapture")
    string(APPEND OPTIONS " --extra-cflags=-DWINAPI_FAMILY=WINAPI_FAMILY_APP --extra-cflags=-D_WIN32_WINNT=0x0A00")
    string(APPEND OPTIONS " --extra-ldflags=-APPCONTAINER --extra-ldflags=WindowsApp.lib --extra-ldflags=dxguid.lib")
endif()

if (VCPKG_TARGET_IS_IOS)
    set(vcpkg_target_arch "${VCPKG_TARGET_ARCHITECTURE}")
    if (VCPKG_TARGET_ARCHITECTURE STREQUAL "x64")
        set(vcpkg_target_arch "x86_64")
    elseif (VCPKG_TARGET_ARCHITECTURE STREQUAL "arm")
        message(FATAL_ERROR "You can build for arm up to iOS 10 but ffmpeg can only be built for iOS 11.0 and later.
                            Did you mean arm64?")
    elseif (VCPKG_TARGET_ARCHITECTURE STREQUAL "x86")
        message(FATAL_ERROR "You can build for x86 up to iOS 10 but ffmpeg can only be built for iOS 11.0 and later.
                            Did you mean x64")
    endif ()

    set(vcpkg_osx_deployment_target "${VCPKG_OSX_DEPLOYMENT_TARGET}")
    if (NOT VCPKG_OSX_DEPLOYMENT_TARGET)
        set(vcpkg_osx_deployment_target 11.0)
    elseif (VCPKG_OSX_DEPLOYMENT_TARGET LESS 11.0) # nowadays ffmpeg needs to be built for ios 11.0 and later
        message(FATAL_ERROR "ffmpeg can be built only for iOS 11.0 and later but you set VCPKG_OSX_DEPLOYMENT_TARGET to
                            ${VCPKG_OSX_DEPLOYMENT_TARGET}")
    endif ()

    if (VCPKG_OSX_SYSROOT STREQUAL "iphonesimulator")
        set(simulator "-simulator")
    endif ()

    set(OPTIONS "${OPTIONS} --extra-cflags=--target=${vcpkg_target_arch}-apple-ios${vcpkg_osx_deployment_target}${simulator}")
    set(OPTIONS "${OPTIONS} --extra-ldflags=--target=${vcpkg_target_arch}-apple-ios${vcpkg_osx_deployment_target}${simulator}")

    set(vcpkg_osx_sysroot "${VCPKG_OSX_SYSROOT}")
    # only on x64 for some reason you need to specify the sdk path, otherwise it will try to build with the MacOS sdk
    # (on apple silicon it's not required but shouldn't cause any problems)
    if ((VCPKG_OSX_SYSROOT MATCHES "^(iphoneos|iphonesimulator)$") OR (NOT VCPKG_OSX_SYSROOT) OR (VCPKG_OSX_SYSROOT STREQUAL "")) # if it's not a path
        if (VCPKG_OSX_SYSROOT MATCHES "^(iphoneos|iphonesimulator)$")
            set(requested_sysroot "${VCPKG_OSX_SYSROOT}")
        elseif (VCPKG_TARGET_ARCHITECTURE STREQUAL "arm64") # if the sysroot is not specified we have to guess
            set(requested_sysroot "iphoneos")
        elseif (VCPKG_TARGET_ARCHITECTURE STREQUAL "x64")
            set(requested_sysroot "iphonesimulator")
        else ()
            message(FATAL_ERROR "Unsupported build arch: ${VCPKG_TARGET_ARCHITECTURE}")
        endif ()
        message(STATUS "Retrieving default SDK for ${requested_sysroot}")
        execute_process(
                COMMAND /usr/bin/xcrun --sdk ${requested_sysroot} --show-sdk-path
                OUTPUT_VARIABLE sdk_path
                ERROR_VARIABLE xcrun_error
                OUTPUT_STRIP_TRAILING_WHITESPACE
                ERROR_STRIP_TRAILING_WHITESPACE
        )
        if (sdk_path)
            message(STATUS "Found!")
            set(vcpkg_osx_sysroot "${sdk_path}")
        else ()
            message(FATAL_ERROR "Can't determine ${CMAKE_OSX_SYSROOT} SDK path. Error: ${xcrun_error}")
        endif ()
    endif ()
    set(OPTIONS "${OPTIONS} --extra-cflags=-isysroot\"${vcpkg_osx_sysroot}\"")
    set(OPTIONS "${OPTIONS} --extra-ldflags=-isysroot\"${vcpkg_osx_sysroot}\"")
endif ()

set(OPTIONS_DEBUG "--disable-optimizations --enable-debug")
set(OPTIONS_RELEASE "--enable-optimizations")

if(VCPKG_DETECTED_MSVC)
    # Determine base linkage (MT or MD)
    set(FFMPEG_CRT_PREFIX "-MT")
    if(VCPKG_CRT_LINKAGE STREQUAL "dynamic")
        set(FFMPEG_CRT_PREFIX "-MD")
    endif()
    # Append Release flags
    string(APPEND OPTIONS_RELEASE " --extra-cflags=${FFMPEG_CRT_PREFIX} --extra-cxxflags=${FFMPEG_CRT_PREFIX}")
    # Append Debug flags (adding the 'd' suffix for the debug runtime)
    string(APPEND OPTIONS_DEBUG " --extra-cflags=${FFMPEG_CRT_PREFIX}d --extra-cxxflags=${FFMPEG_CRT_PREFIX}d")
endif()

set(OPTIONS "${OPTIONS} ${OPTIONS_CROSS}")

if(VCPKG_LIBRARY_LINKAGE STREQUAL "dynamic")
    set(OPTIONS "${OPTIONS} --disable-static --enable-shared")
endif()

if(VCPKG_TARGET_IS_MINGW)
    set(OPTIONS "${OPTIONS} --extra_cflags=-D_WIN32_WINNT=0x0601")
elseif(VCPKG_TARGET_IS_WINDOWS)
    set(OPTIONS "${OPTIONS} --extra-cflags=-DHAVE_UNISTD_H=0")
endif()

if(NOT VCPKG_TARGET_IS_WINDOWS)
    set(maybe_needed_libraries -lm)
else()
    set(maybe_needed_libraries "")
endif()

separate_arguments(standard_libraries NATIVE_COMMAND "${VCPKG_DETECTED_CMAKE_C_STANDARD_LIBRARIES}")
foreach(item IN LISTS standard_libraries)
    if(item IN_LIST maybe_needed_libraries)
        set(OPTIONS "${OPTIONS} \"--extra-libs=${item}\"")
    endif()
endforeach()

vcpkg_find_acquire_program(PKGCONFIG)
set(OPTIONS "${OPTIONS} --pkg-config=\"${PKGCONFIG}\"")
if(VCPKG_LIBRARY_LINKAGE STREQUAL "static")
    set(OPTIONS "${OPTIONS} --pkg-config-flags=--static")
endif()

message(STATUS "Building Options: ${OPTIONS}")

# Release build
if (NOT VCPKG_BUILD_TYPE OR VCPKG_BUILD_TYPE STREQUAL "release")
    if (VCPKG_DETECTED_MSVC)
        set(OPTIONS_RELEASE "${OPTIONS_RELEASE} --extra-ldflags=-libpath:\"${CURRENT_INSTALLED_DIR}/lib\"")
    else()
        set(OPTIONS_RELEASE "${OPTIONS_RELEASE} --extra-ldflags=-L\"${CURRENT_INSTALLED_DIR}/lib\"")
    endif()
    message(STATUS "Building Release Options: ${OPTIONS_RELEASE}")
    message(STATUS "Building ${PORT} for Release")
    file(MAKE_DIRECTORY "${CURRENT_BUILDTREES_DIR}/${TARGET_TRIPLET}-rel")
    # We use response files here as the only known way to handle spaces in paths
    set(crsp "${CURRENT_BUILDTREES_DIR}/${TARGET_TRIPLET}-rel/cflags.rsp")
    string(REGEX REPLACE "-arch [A-Za-z0-9_]+" "" VCPKG_COMBINED_C_FLAGS_RELEASE_SANITIZED "${VCPKG_COMBINED_C_FLAGS_RELEASE}")
    file(WRITE "${crsp}" "${VCPKG_COMBINED_C_FLAGS_RELEASE_SANITIZED}")
    set(ldrsp "${CURRENT_BUILDTREES_DIR}/${TARGET_TRIPLET}-rel/ldflags.rsp")
    string(REGEX REPLACE "-arch [A-Za-z0-9_]+" "" VCPKG_COMBINED_SHARED_LINKER_FLAGS_RELEASE_SANITIZED "${VCPKG_COMBINED_SHARED_LINKER_FLAGS_RELEASE}")
    file(WRITE "${ldrsp}" "${VCPKG_COMBINED_SHARED_LINKER_FLAGS_RELEASE_SANITIZED}")
    set(ENV{CFLAGS} "@${crsp}")
    # All tools except the msvc arm{,64} assembler accept @... as response file syntax.
    # For that assembler, there is no known way to pass in flags. We must hope that not passing flags will work acceptably.
    if(NOT VCPKG_DETECTED_MSVC OR NOT VCPKG_TARGET_ARCHITECTURE MATCHES "^arm")
        set(ENV{ASFLAGS} "@${crsp}")
    endif()
    set(ENV{LDFLAGS} "@${ldrsp}")
    set(ENV{ARFLAGS} "${VCPKG_COMBINED_STATIC_LINKER_FLAGS_RELEASE}")

    set(BUILD_DIR         "${CURRENT_BUILDTREES_DIR}/${TARGET_TRIPLET}-rel")
    set(CONFIGURE_OPTIONS "${OPTIONS} ${OPTIONS_RELEASE}")
    set(INST_PREFIX       "${CURRENT_PACKAGES_DIR}")

    configure_file("${CMAKE_CURRENT_LIST_DIR}/build.sh.in" "${BUILD_DIR}/build.sh" @ONLY)

    z_vcpkg_setup_pkgconfig_path(CONFIG RELEASE)

    vcpkg_execute_required_process(
        COMMAND "${SHELL}" ./build.sh
        WORKING_DIRECTORY "${BUILD_DIR}"
        LOGNAME "build-${TARGET_TRIPLET}-rel"
        SAVE_LOG_FILES ffbuild/config.log
    )

    z_vcpkg_restore_pkgconfig_path()
endif()

# Debug build
if (NOT VCPKG_BUILD_TYPE OR VCPKG_BUILD_TYPE STREQUAL "debug")
    if (VCPKG_DETECTED_MSVC)
        set(OPTIONS_DEBUG "${OPTIONS_DEBUG} --extra-ldflags=-libpath:\"${CURRENT_INSTALLED_DIR}/debug/lib\"")
    else()
        set(OPTIONS_DEBUG "${OPTIONS_DEBUG} --extra-ldflags=-L\"${CURRENT_INSTALLED_DIR}/debug/lib\"")
    endif()
    message(STATUS "Building Debug Options: ${OPTIONS_DEBUG}")
    message(STATUS "Building ${PORT} for Debug")
    file(MAKE_DIRECTORY "${CURRENT_BUILDTREES_DIR}/${TARGET_TRIPLET}-dbg")
    set(crsp "${CURRENT_BUILDTREES_DIR}/${TARGET_TRIPLET}-dbg/cflags.rsp")
    string(REGEX REPLACE "-arch [A-Za-z0-9_]+" "" VCPKG_COMBINED_C_FLAGS_DEBUG_SANITIZED "${VCPKG_COMBINED_C_FLAGS_DEBUG}")
    file(WRITE "${crsp}" "${VCPKG_COMBINED_C_FLAGS_DEBUG_SANITIZED}")
    set(ldrsp "${CURRENT_BUILDTREES_DIR}/${TARGET_TRIPLET}-dbg/ldflags.rsp")
    string(REGEX REPLACE "-arch [A-Za-z0-9_]+" "" VCPKG_COMBINED_SHARED_LINKER_FLAGS_DEBUG_SANITIZED "${VCPKG_COMBINED_SHARED_LINKER_FLAGS_DEBUG}")
    file(WRITE "${ldrsp}" "${VCPKG_COMBINED_SHARED_LINKER_FLAGS_DEBUG_SANITIZED}")
    set(ENV{CFLAGS} "@${crsp}")
    if(NOT VCPKG_DETECTED_MSVC OR NOT VCPKG_TARGET_ARCHITECTURE MATCHES "^arm")
        set(ENV{ASFLAGS} "@${crsp}")
    endif()
    set(ENV{LDFLAGS} "@${ldrsp}")
    set(ENV{ARFLAGS} "${VCPKG_COMBINED_STATIC_LINKER_FLAGS_DEBUG}")

    set(BUILD_DIR         "${CURRENT_BUILDTREES_DIR}/${TARGET_TRIPLET}-dbg")
    set(CONFIGURE_OPTIONS "${OPTIONS} ${OPTIONS_DEBUG}")
    set(INST_PREFIX       "${CURRENT_PACKAGES_DIR}/debug")

    configure_file("${CMAKE_CURRENT_LIST_DIR}/build.sh.in" "${BUILD_DIR}/build.sh" @ONLY)

    z_vcpkg_setup_pkgconfig_path(CONFIG DEBUG)

    vcpkg_execute_required_process(
        COMMAND "${SHELL}" ./build.sh
        WORKING_DIRECTORY "${BUILD_DIR}"
        LOGNAME "build-${TARGET_TRIPLET}-dbg"
        SAVE_LOG_FILES ffbuild/config.log
    )

    z_vcpkg_restore_pkgconfig_path()
endif()

if(VCPKG_TARGET_IS_WINDOWS)
    file(GLOB DEF_FILES "${CURRENT_PACKAGES_DIR}/lib/*.def" "${CURRENT_PACKAGES_DIR}/debug/lib/*.def")

    if(NOT VCPKG_TARGET_IS_MINGW)
        if(VCPKG_TARGET_ARCHITECTURE STREQUAL "arm")
            set(LIB_MACHINE_ARG /machine:ARM)
        elseif(VCPKG_TARGET_ARCHITECTURE STREQUAL "arm64")
            set(LIB_MACHINE_ARG /machine:ARM64)
        elseif(VCPKG_TARGET_ARCHITECTURE STREQUAL "x86")
            set(LIB_MACHINE_ARG /machine:x86)
        elseif(VCPKG_TARGET_ARCHITECTURE STREQUAL "x64")
            set(LIB_MACHINE_ARG /machine:x64)
        else()
            message(FATAL_ERROR "Unsupported target architecture")
        endif()

        foreach(DEF_FILE ${DEF_FILES})
            get_filename_component(DEF_FILE_DIR "${DEF_FILE}" DIRECTORY)
            get_filename_component(DEF_FILE_NAME "${DEF_FILE}" NAME)
            string(REGEX REPLACE "-[0-9]*\\.def" "${VCPKG_TARGET_STATIC_LIBRARY_SUFFIX}" OUT_FILE_NAME "${DEF_FILE_NAME}")
            file(TO_NATIVE_PATH "${DEF_FILE}" DEF_FILE_NATIVE)
            file(TO_NATIVE_PATH "${DEF_FILE_DIR}/${OUT_FILE_NAME}" OUT_FILE_NATIVE)
            message(STATUS "Generating ${OUT_FILE_NATIVE}")
            vcpkg_execute_required_process(
                COMMAND lib.exe "/def:${DEF_FILE_NATIVE}" "/out:${OUT_FILE_NATIVE}" ${LIB_MACHINE_ARG}
                WORKING_DIRECTORY "${CURRENT_PACKAGES_DIR}"
                LOGNAME "libconvert-${TARGET_TRIPLET}"
            )
        endforeach()
    endif()

    file(GLOB EXP_FILES "${CURRENT_PACKAGES_DIR}/lib/*.exp" "${CURRENT_PACKAGES_DIR}/debug/lib/*.exp")
    file(GLOB LIB_FILES "${CURRENT_PACKAGES_DIR}/bin/*${VCPKG_TARGET_STATIC_LIBRARY_SUFFIX}" "${CURRENT_PACKAGES_DIR}/debug/bin/*${VCPKG_TARGET_STATIC_LIBRARY_SUFFIX}")
    if(VCPKG_TARGET_IS_MINGW)
        file(GLOB LIB_FILES_2 "${CURRENT_PACKAGES_DIR}/bin/*.lib" "${CURRENT_PACKAGES_DIR}/debug/bin/*.lib")
    endif()
    set(files_to_remove ${EXP_FILES} ${LIB_FILES} ${LIB_FILES_2} ${DEF_FILES})
    if(files_to_remove)
        file(REMOVE ${files_to_remove})
    endif()
endif()

if("ffmpeg" IN_LIST FEATURES)
    vcpkg_copy_tools(TOOL_NAMES ffmpeg AUTO_CLEAN)
endif()
if("ffprobe" IN_LIST FEATURES)
    vcpkg_copy_tools(TOOL_NAMES ffprobe AUTO_CLEAN)
endif()
if("ffplay" IN_LIST FEATURES)
    vcpkg_copy_tools(TOOL_NAMES ffplay AUTO_CLEAN)
endif()

file(REMOVE_RECURSE "${CURRENT_PACKAGES_DIR}/debug/include" "${CURRENT_PACKAGES_DIR}/debug/share")

if(VCPKG_LIBRARY_LINKAGE STREQUAL "static")
    file(REMOVE_RECURSE "${CURRENT_PACKAGES_DIR}/bin" "${CURRENT_PACKAGES_DIR}/debug/bin")
endif()

vcpkg_copy_pdbs()

if(VCPKG_TARGET_IS_WINDOWS)
    file(GLOB pc_files "${CURRENT_PACKAGES_DIR}/lib/pkgconfig/*.pc" "${CURRENT_PACKAGES_DIR}/debug/lib/pkgconfig/*.pc")
    foreach(file IN LISTS pc_files)
        # ffmpeg exports -libpath:foo and bar.lib for transitive deps.
        # But CMake's pkg_check_modules cannot handle this properly.
        # pc files generally use non-msvc syntax with -Lfoo -lbar.
        file(READ "${file}" content)
        foreach(entry IN ITEMS Libs Libs.private)
            if(content MATCHES "${entry}:( [^\n]*)")
                set(old_value "${CMAKE_MATCH_1}")
                string(REGEX REPLACE "-libpath:" "-L" new_value "${old_value}")
                string(REGEX REPLACE " ([^ /]+)[.]lib" " -l\\1" new_value "${new_value}")
                string(REPLACE "${entry}:${old_value}" "${entry}:${new_value}" content "${content}")
            endif()
        endforeach()
        file(WRITE "${file}" "${content}")
    endforeach()
endif()
vcpkg_fixup_pkgconfig()

# Handle dependencies

x_vcpkg_pkgconfig_get_modules(PREFIX FFMPEG_PKGCONFIG MODULES ${FFMPEG_PKGCONFIG_MODULES} LIBS)

function(append_dependencies_from_libs out)
    cmake_parse_arguments(PARSE_ARGV 1 "arg" "" "LIBS" "")
    separate_arguments(contents UNIX_COMMAND "${arg_LIBS}")
    list(FILTER contents EXCLUDE REGEX "^-F.+")
    list(FILTER contents EXCLUDE REGEX "^-framework$")
    list(FILTER contents EXCLUDE REGEX "^-L.+")
    list(FILTER contents EXCLUDE REGEX "^-libpath:.+")
    list(TRANSFORM contents REPLACE "^-Wl,-framework," "-l")
    list(FILTER contents EXCLUDE REGEX "^-Wl,.+")
    list(TRANSFORM contents REPLACE "^-l" "")
    list(FILTER contents EXCLUDE REGEX "^avutil$")
    list(FILTER contents EXCLUDE REGEX "^avcodec$")
    list(FILTER contents EXCLUDE REGEX "^avdevice$")
    list(FILTER contents EXCLUDE REGEX "^avfilter$")
    list(FILTER contents EXCLUDE REGEX "^avformat$")
    list(FILTER contents EXCLUDE REGEX "^swresample$")
    list(FILTER contents EXCLUDE REGEX "^swscale$")
    if(VCPKG_TARGET_IS_WINDOWS)
        list(TRANSFORM contents TOLOWER)
    endif()
    if(contents)
        list(APPEND "${out}" "${contents}")
        set("${out}" "${${out}}" PARENT_SCOPE)
    endif()
endfunction()

append_dependencies_from_libs(FFMPEG_DEPENDENCIES_RELEASE LIBS "${FFMPEG_PKGCONFIG_LIBS_RELEASE}")
append_dependencies_from_libs(FFMPEG_DEPENDENCIES_DEBUG   LIBS "${FFMPEG_PKGCONFIG_LIBS_DEBUG}")

# must remove duplicates from the front to respect link order so reverse first
list(REVERSE FFMPEG_DEPENDENCIES_RELEASE)
list(REVERSE FFMPEG_DEPENDENCIES_DEBUG)
list(REMOVE_DUPLICATES FFMPEG_DEPENDENCIES_RELEASE)
list(REMOVE_DUPLICATES FFMPEG_DEPENDENCIES_DEBUG)
list(REVERSE FFMPEG_DEPENDENCIES_RELEASE)
list(REVERSE FFMPEG_DEPENDENCIES_DEBUG)

message(STATUS "Dependencies (release): ${FFMPEG_DEPENDENCIES_RELEASE}")
message(STATUS "Dependencies (debug):   ${FFMPEG_DEPENDENCIES_DEBUG}")

# Handle version strings

function(extract_regex_from_file out)
    cmake_parse_arguments(PARSE_ARGV 1 "arg" "MAJOR" "FILE_WITHOUT_EXTENSION;REGEX" "")
    file(READ "${arg_FILE_WITHOUT_EXTENSION}.h" contents)
    if (contents MATCHES "${arg_REGEX}")
        if(NOT CMAKE_MATCH_COUNT EQUAL 1)
            message(FATAL_ERROR "Could not identify match group in regular expression \"${arg_REGEX}\"")
        endif()
    else()
        if (arg_MAJOR)
            file(READ "${arg_FILE_WITHOUT_EXTENSION}_major.h" contents)
            if (contents MATCHES "${arg_REGEX}")
                if(NOT CMAKE_MATCH_COUNT EQUAL 1)
                    message(FATAL_ERROR "Could not identify match group in regular expression \"${arg_REGEX}\"")
                endif()
            else()
                message(WARNING "Could not find line matching \"${arg_REGEX}\" in file \"${arg_FILE_WITHOUT_EXTENSION}_major.h\"")
            endif()
        else()
            message(WARNING "Could not find line matching \"${arg_REGEX}\" in file \"${arg_FILE_WITHOUT_EXTENSION}.h\"")
        endif()
    endif()
    set("${out}" "${CMAKE_MATCH_1}" PARENT_SCOPE)
endfunction()

function(extract_version_from_component out)
    cmake_parse_arguments(PARSE_ARGV 1 "arg" "" "COMPONENT" "")
    string(TOLOWER "${arg_COMPONENT}" component_lower)
    string(TOUPPER "${arg_COMPONENT}" component_upper)
    extract_regex_from_file(major_version
        FILE_WITHOUT_EXTENSION "${SOURCE_PATH}/${component_lower}/version"
        MAJOR
        REGEX "#define ${component_upper}_VERSION_MAJOR[ ]+([0-9]+)"
    )
    extract_regex_from_file(minor_version
        FILE_WITHOUT_EXTENSION "${SOURCE_PATH}/${component_lower}/version"
        REGEX "#define ${component_upper}_VERSION_MINOR[ ]+([0-9]+)"
    )
    extract_regex_from_file(micro_version
        FILE_WITHOUT_EXTENSION "${SOURCE_PATH}/${component_lower}/version"
        REGEX "#define ${component_upper}_VERSION_MICRO[ ]+([0-9]+)"
    )
    set("${out}" "${major_version}.${minor_version}.${micro_version}" PARENT_SCOPE)
endfunction()

extract_regex_from_file(FFMPEG_VERSION
    FILE_WITHOUT_EXTENSION "${CURRENT_BUILDTREES_DIR}/${TARGET_TRIPLET}-rel/libavutil/ffversion"
    REGEX "#define FFMPEG_VERSION[ ]+\"(.+)\""
)

extract_version_from_component(LIBAVUTIL_VERSION
    COMPONENT libavutil)
extract_version_from_component(LIBAVCODEC_VERSION
    COMPONENT libavcodec)
extract_version_from_component(LIBAVDEVICE_VERSION
    COMPONENT libavdevice)
extract_version_from_component(LIBAVFILTER_VERSION
    COMPONENT libavfilter)
extract_version_from_component(LIBAVFORMAT_VERSION
    COMPONENT libavformat)
extract_version_from_component(LIBSWRESAMPLE_VERSION
    COMPONENT libswresample)
extract_version_from_component(LIBSWSCALE_VERSION
    COMPONENT libswscale)

# Handle copyright
file(STRINGS "${CURRENT_BUILDTREES_DIR}/build-${TARGET_TRIPLET}-rel-out.log" LICENSE_STRING REGEX "License: .*" LIMIT_COUNT 1)
if(LICENSE_STRING STREQUAL "License: LGPL version 2.1 or later")
    set(LICENSE_FILE "COPYING.LGPLv2.1")
elseif(LICENSE_STRING STREQUAL "License: LGPL version 3 or later")
    set(LICENSE_FILE "COPYING.LGPLv3")
elseif(LICENSE_STRING STREQUAL "License: GPL version 2 or later")
    set(LICENSE_FILE "COPYING.GPLv2")
elseif(LICENSE_STRING STREQUAL "License: GPL version 3 or later")
    set(LICENSE_FILE "COPYING.GPLv3")
elseif(LICENSE_STRING STREQUAL "License: nonfree and unredistributable")
    set(LICENSE_FILE "COPYING.NONFREE")
    file(WRITE "${SOURCE_PATH}/${LICENSE_FILE}" "${LICENSE_STRING}")
else()
    message(FATAL_ERROR "Failed to identify license (${LICENSE_STRING})")
endif()

configure_file("${CMAKE_CURRENT_LIST_DIR}/FindFFMPEG.cmake.in" "${CURRENT_PACKAGES_DIR}/share/${PORT}/FindFFMPEG.cmake" @ONLY)
configure_file("${CMAKE_CURRENT_LIST_DIR}/vcpkg-cmake-wrapper.cmake" "${CURRENT_PACKAGES_DIR}/share/${PORT}/vcpkg-cmake-wrapper.cmake" @ONLY)

file(INSTALL "${CMAKE_CURRENT_LIST_DIR}/usage" DESTINATION "${CURRENT_PACKAGES_DIR}/share/${PORT}")
if(VCPKG_LIBRARY_LINKAGE STREQUAL "static" AND NOT VCPKG_TARGET_IS_WINDOWS AND NOT VCPKG_TARGET_IS_OSX AND NOT VCPKG_TARGET_IS_IOS)
    file(APPEND "${CURRENT_PACKAGES_DIR}/share/${PORT}/usage" "
To use the static libraries to build your own shared library,
you may need to add the following link option for your library:

  -Wl,-Bsymbolic
")
endif()

vcpkg_install_copyright(FILE_LIST "${SOURCE_PATH}/${LICENSE_FILE}")