path: root/pkgs/by-name/li/livekit-libwebrtc/package.nix

{
  stdenv,
  clang,
  callPackage,
  lib,
  gn,
  fetchurl,
  fetchpatch,
  xcbuild,
  python3,
  ninja,
  apple-sdk_14,
  darwinMinVersionHook,
  git,
  cpio,
  pkg-config,
  glib,
  alsa-lib,
  pulseaudio,
  nasm,
  brotli,
  fontconfig,
  freetype,
  harfbuzz,
  icu,
  jsoncpp,
  libpng,
  libwebp,
  libxml2,
  libxslt,
  minizip,
  ffmpeg_6,
  writeShellScript,
}:
let
  sources = callPackage ./sources.nix { };

  platformMap = {
    "x86_64" = "x64";
    "i686" = "x86";
    "arm" = "arm";
    "aarch64" = "arm64";
  };
  cpuName = stdenv.hostPlatform.parsed.cpu.name;
  gnArch = platformMap."${cpuName}" or (throw "unsupported arch ${cpuName}");
  gnOs =
    if stdenv.hostPlatform.isLinux then
      "linux"
    else if stdenv.hostPlatform.isDarwin then
      "mac"
    else
      throw "unknown platform ${stdenv.hostPlatform.config}";
  boringSslSymbols = fetchurl {
    url = "https://raw.githubusercontent.com/livekit/rust-sdks/refs/tags/webrtc-dac8015-6/webrtc-sys/libwebrtc/boringssl_prefix_symbols.txt";
    hash = "sha256-dAweArv8zjsFPENEKi9mNBQkt4y+hh3rCqG6QZjRC20=";
  };
  gnSystemLibraries = import ./mkSystemLibraries.nix {
    inherit
      brotli
      fontconfig
      freetype
      harfbuzz
      icu
      jsoncpp
      libpng
      libwebp
      libxml2
      libxslt
      minizip
      ffmpeg_6
      ;
  };
  gclient2nix = python3.pkgs.callPackage ./gclient2nix.nix { };
in
stdenv.mkDerivation {
  pname = "livekit-libwebrtc";
  version = "m114";

  src = "${sources}/src";

  patches =
    [
      # Adds missing dependencies to generated LICENSE
      (fetchpatch {
        url = "https://raw.githubusercontent.com/livekit/rust-sdks/b41861c7b71762d5d85b3de07ae67ffcae7c3fa2/webrtc-sys/libwebrtc/patches/add_licenses.patch";
        hash = "sha256-9A4KyRW1K3eoQxsTbPX0vOnj66TCs2Fxjpsu5wO8mGI=";
      })
      # Fixes the certificate chain, required for Let's Encrypt certs
      (fetchpatch {
        url = "https://raw.githubusercontent.com/livekit/rust-sdks/b41861c7b71762d5d85b3de07ae67ffcae7c3fa2/webrtc-sys/libwebrtc/patches/ssl_verify_callback_with_native_handle.patch";
        hash = "sha256-/gneuCac4VGJCWCjJZlgLKFOTV+x7Lc5KVFnNIKenwM=";
      })
      # Adds dependencies and features required by livekit
      (fetchpatch {
        url = "https://raw.githubusercontent.com/livekit/rust-sdks/b41861c7b71762d5d85b3de07ae67ffcae7c3fa2/webrtc-sys/libwebrtc/patches/add_deps.patch";
        hash = "sha256-EMNYcTcBYh51Tt96+HP43ND11qGKClfx3xIPQmIBSo0=";
      })
      # Fixes concurrency and localization issues
      (fetchpatch {
        url = "https://github.com/zed-industries/webrtc/commit/08f7a701a2eda6407670508fc2154257a3c90308.patch";
        hash = "sha256-oWYZLwqjRSHDt92MqsxsoBSMyZKj1ubNbOXZRbPpbEw=";
      })
      # Required for dynamically linking to ffmpeg libraries and exposing symbols
      ./0001-shared-libraries.patch
    ]
    ++ lib.optionals stdenv.hostPlatform.isDarwin [
      ./0002-disable-narrowing-const-reference.patch
    ];

  postPatch =
    ''
      substituteInPlace tools/generate_shim_headers/generate_shim_headers.py \
        --replace-fail "OFFICIAL_BUILD" "GOOGLE_CHROME_BUILD"

      substituteInPlace BUILD.gn \
        --replace-fail "rtc_static_library" "rtc_shared_library" \
        --replace-fail "complete_static_lib = true" ""

      substituteInPlace webrtc.gni \
        --replace-fail "!build_with_chromium && is_component_build" "false"

      substituteInPlace rtc_tools/BUILD.gn \
        --replace-fail "\":frame_analyzer\"," ""

      for lib in ${toString (builtins.attrNames gnSystemLibraries)}; do
        if [ -d "third_party/$lib" ]; then
          find "third_party/$lib" -type f \
            \! -path "third_party/$lib/chromium/*" \
            \! -path "third_party/$lib/google/*" \
            \! -path "third_party/harfbuzz-ng/utils/hb_scoped.h" \
            \! -regex '.*\.\(gn\|gni\|isolate\)' \
            \! -name 'LICENSE*' \
            \! -name 'COPYING*' \
            -delete
        fi
      done
    ''
    + lib.optionalString stdenv.hostPlatform.isLinux ''
      ln -sf ${lib.getExe gn} buildtools/linux64/gn
      substituteInPlace build/toolchain/linux/BUILD.gn \
        --replace 'toolprefix = "aarch64-linux-gnu-"' 'toolprefix = ""'
    ''
    + lib.optionalString stdenv.hostPlatform.isDarwin ''
      ln -sf ${lib.getExe gn} buildtools/mac/gn
      chmod +x build/toolchain/apple/linker_driver.py
      patchShebangs build/toolchain/apple/linker_driver.py
      substituteInPlace build/toolchain/apple/toolchain.gni --replace-fail "/bin/cp -Rc" "cp -a"
    '';

  outputs = [
    "dev"
    "out"
  ];

  nativeBuildInputs =
    (builtins.concatLists (
      lib.mapAttrsToList (
        _: library: if (library.package ? dev) then [ library.package.dev ] else [ ]
      ) gnSystemLibraries
    ))
    ++ [
      gn
      (python3.withPackages (ps: [ ps.setuptools ]))
      ninja
      git
      cpio
      pkg-config
    ]
    ++ lib.optionals stdenv.hostPlatform.isDarwin [ xcbuild ];

  buildInputs =
    [ nasm ]
    ++ (lib.mapAttrsToList (_: library: library.package) gnSystemLibraries)
    ++ (lib.optionals stdenv.hostPlatform.isLinux [
      glib
      alsa-lib
      pulseaudio
    ])
    ++ lib.optionals stdenv.hostPlatform.isDarwin [
      apple-sdk_14
      (darwinMinVersionHook "12.3")
    ];

  preConfigure = ''
    echo "generate_location_tags = true" >> build/config/gclient_args.gni
    echo "0" > build/util/LASTCHANGE.committime

    python build/linux/unbundle/replace_gn_files.py \
        --system-libraries ${toString (builtins.attrNames gnSystemLibraries)}
  '';

  gnFlags =
    [
      "is_debug=false"
      "rtc_include_tests=false"
      ''target_os="${gnOs}"''
      ''target_cpu="${gnArch}"''
      "treat_warnings_as_errors=false"
      "rtc_enable_protobuf=false"
      "rtc_include_tests=false"
      "rtc_build_examples=false"
      "rtc_build_tools=false"
      "rtc_libvpx_build_vp9=true"
      "enable_libaom=true"
      "use_dummy_lastchange=true"
      "is_component_build=true"
      "enable_stripping=true"
      "rtc_use_h264=true"
      "use_custom_libcxx=false"
      "use_rtti=true"
    ]
    ++ (lib.optionals stdenv.hostPlatform.isLinux [
      "use_goma=false"
      "rtc_use_pipewire=false"
      "symbol_level=0"
      "enable_iterator_debugging=false"
      "rtc_use_x11=false"
      "use_sysroot=false"
      "is_clang=false"
    ])
    ++ (lib.optionals stdenv.hostPlatform.isDarwin [
      ''mac_deployment_target="12.3"''
      "rtc_enable_symbol_export=true"
      "rtc_enable_objc_symbol_export=true"
      "rtc_include_dav1d_in_internal_decoder_factory=true"
      "clang_use_chrome_plugins=false"
      "use_lld=false"
      ''clang_base_path="${clang}"''
    ]);

  ninjaFlags =
    [ ":default" ]
    ++ lib.optionals stdenv.hostPlatform.isDarwin [
      "api/audio_codecs:builtin_audio_decoder_factory"
      "api/task_queue:default_task_queue_factory"
      "sdk:native_api"
      "sdk:default_codec_factory_objc"
      "pc:peerconnection"
      "sdk:videocapture_objc"
      "sdk:mac_framework_objc"
    ];

  postBuild =
    lib.optionalString stdenv.hostPlatform.isLinux ''
      objcopy --redefine-syms="${boringSslSymbols}" "libwebrtc.so"
    ''
    + ''
      # Generate licenses
      python3 "../../tools_webrtc/libs/generate_licenses.py" \
          --target ${if stdenv.hostPlatform.isDarwin then ":webrtc" else ":default"} $PWD $PWD
    '';

  installPhase =
    ''
      runHook preInstall

      mkdir -p $out/lib
      mkdir -p $dev/include

      install -m0644 obj/webrtc.ninja args.gn LICENSE.md $dev

      pushd ../..
      find . -name "*.h" -print | cpio -pd $dev/include
      popd
    ''
    + lib.optionalString stdenv.hostPlatform.isLinux ''
      install -m0644 libwebrtc.so libthird_party_boringssl.so $out/lib
    ''
    + lib.optionalString stdenv.hostPlatform.isDarwin ''
      install -m0644 WebRTC.framework/Versions/A/WebRTC $out/lib/libwebrtc.dylib
      install -m0644 libthird_party_boringssl.dylib $out/lib
    ''
    + ''
      ln -s $out/lib $dev/lib

      runHook postInstall
    '';

  postFixup = lib.optionalString stdenv.hostPlatform.isDarwin ''
    boringssl="$out/lib/libthird_party_boringssl.dylib"
    webrtc="$out/lib/libwebrtc.dylib"

    install_name_tool -id "$boringssl" "$boringssl"
    install_name_tool -id "$webrtc" "$webrtc"
    install_name_tool -change @rpath/libthird_party_boringssl.dylib "$boringssl" "$webrtc"
  '';

  passthru.updateScript = writeShellScript "update-livekit-libwebrtc" ''
    set -eou pipefail
    cd pkgs/by-name/li/livekit-libwebrtc
    ${lib.getExe gclient2nix} --main-source-path src https://github.com/webrtc-sdk/webrtc.git m114_release
  '';

  meta = {
    description = "WebRTC library used by livekit";
    homepage = "https://github.com/livekit/rust-sdks/";
    license = lib.licenses.bsd3;
    maintainers = with lib.maintainers; [
      WeetHet
      niklaskorz
    ];
    platforms = lib.platforms.linux ++ lib.platforms.darwin;
  };
}