Add ffmpeg example

examples/third_party/.bazelrc

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+# Enable Bzlmod for every Bazel command
+common --enable_bzlmod
+
+# Always use the pre-configured toolchain.
+build --repo_env=BAZEL_DO_NOT_DETECT_CPP_TOOLCHAIN=1
+build --action_env=BAZEL_DO_NOT_DETECT_CPP_TOOLCHAIN=1
+
+# Use a static value for `PATH` and does not inherit `LD_LIBRARY_PATH`. Doesn't let environment
+# variables like `PATH` sneak into the build, which can cause massive cache misses when they change.
+# Use `--action_env=ENV_VARIABLE` if you want to inherit specific environment variables from the
+# client, but note that doing so can prevent cross-user caching if a shared cache is used.
+# Docs: https://bazel.build/reference/command-line-reference#flag--incompatible_strict_action_env
+build --incompatible_strict_action_env

examples/third_party/BUILD.sysroot.bazel

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+filegroup(
+    name = "all_files",
+    srcs = glob([
+        "lib/x86_64-linux-gnu/ld*",
+        "lib/x86_64-linux-gnu/libc*",
+        "lib/x86_64-linux-gnu/libdl*",
+        "lib/x86_64-linux-gnu/libgcc*",
+        "lib/x86_64-linux-gnu/libm*",
+        "lib/x86_64-linux-gnu/libpthread*",
+        "lib/x86_64-linux-gnu/librt*",
+        "lib/x86_64-linux-gnu/libutil*",
+        "lib64/**",
+        "usr/include/*.h",
+        "usr/include/arpa/**",
+        "usr/include/asm-generic/**",
+        "usr/include/linux/**",
+        "usr/include/net/**",
+        "usr/include/netinet/**",
+        "usr/include/rpc/**",
+        "usr/include/sys/**",
+        "usr/include/x86_64-linux-gnu/**",
+        "usr/lib/gcc/**",
+        "usr/lib/x86_64-linux-gnu/*crt*.o",
+        "usr/lib/x86_64-linux-gnu/libc_nonshared.a",
+        "usr/lib/x86_64-linux-gnu/libc.a",
+        "usr/lib/x86_64-linux-gnu/libc.so",
+        "usr/lib/x86_64-linux-gnu/libdl*",
+        "usr/lib/x86_64-linux-gnu/libm*",
+        "usr/lib/x86_64-linux-gnu/libpthread*",
+        "usr/lib/x86_64-linux-gnu/libresolv.so",
+        "usr/lib/x86_64-linux-gnu/librt*",
+        "usr/lib/x86_64-linux-gnu/libutil*",
+      ],
+      exclude = [
+        # The sysroot contains libstdc++, but we use libc++ from our toolchain
+        # repo. Exclude these files so we don't pull them into the sandbox
+        # unnecessarily. When upgrading, make sure the newest libstdc++ is
+        # excluded.
+        "usr/include/c++/**",
+        "usr/include/x86_64-linux-gnu/c++/**",
+        "usr/lib/gcc/x86_64-linux-gnu/6/libstdc++*",
+        "usr/lib/gcc/x86_64-linux-gnu/10/libstdc++*",
+      ],
+    ),
+    visibility = ["//visibility:public"],
+)

examples/third_party/MODULE.bazel

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+bazel_dep(name = "rules_foreign_cc")
+local_path_override(
+    module_name = "rules_foreign_cc",
+    path = "../..",
+)
+
+bazel_dep(name = "nasm", version = "2.14.02")
+bazel_dep(name = "platforms", version = "0.0.9")
+bazel_dep(name = "rules_cc", version = "0.0.9")
+bazel_dep(name = "rules_python", version = "0.23.1")
+bazel_dep(name = "rules_license", version = "0.0.8")
+
+non_module_deps = use_extension("//:repositories.bzl", "repositories_ext")
+use_repo(
+    non_module_deps,
+    "com_googleapis_storage_chrome_linux_amd64_sysroot",
+    "ffmpeg",
+    "libaom",
+    "libdav1d",
+    "libsvtav1",
+    "libvpx",
+    "libyuv",
+    "yasm",
+)
+
+# C++ toolchain
+bazel_dep(name = "toolchains_llvm", version = "1.2.0")
+llvm = use_extension("@toolchains_llvm//toolchain/extensions:llvm.bzl", "llvm", dev_dependency = True)
+llvm.toolchain(llvm_version = "19.1.0")
+llvm.sysroot(
+    label = "@com_googleapis_storage_chrome_linux_amd64_sysroot//:all_files",
+    targets = ["linux-x86_64"],
+)
+use_repo(llvm, "llvm_toolchain")
+register_toolchains("@llvm_toolchain//:all", dev_dependency = True)
+
+
+# Python toolchain
+python = use_extension("@rules_python//python/extensions:python.bzl", "python")
+python.toolchain(
+    configure_coverage_tool = True,
+    # Only set when you have mulitple toolchain versions.
+    is_default = True,
+    python_version = "3.10",
+)

examples/third_party/ffmpeg/BUILD.bazel

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+load("@bazel_skylib//rules:build_test.bzl", "build_test")
+
+exports_files(
+    [
+        "BUILD.ffmpeg.bazel",
+    ],
+    visibility = ["//visibility:public"],
+)
+
+build_test(
+    name = "ffmpeg_build_test",
+    targets = [
+        "@ffmpeg//:ffmpeg",
+    ],
+    visibility = ["//:__pkg__"],
+)

examples/third_party/ffmpeg/BUILD.ffmpeg.bazel

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+load("@rules_license//rules:license.bzl", "license")
+load("@rules_foreign_cc//foreign_cc:defs.bzl", "configure_make")
+
+package(
+    default_applicable_licenses = [":license"],
+    default_visibility = ["//visibility:public"],
+)
+
+exports_files(["LICENSE"])
+
+license(
+    name = "license",
+    package_name = "ffmpeg",
+    license_kinds = [
+        "@rules_license//licenses/spdx:LGPL-3.0-or-later",
+    ],
+    license_text = "LICENSE",
+    package_url = "https://github.com/FFmpeg/FFmpeg",
+)
+
+LGPL_LIBRARIES = [
+    "libavcodec",
+    "libavdevice",
+    "libavfilter",
+    "libavformat",
+    "libavutil",
+    "libswresample",
+    "libswscale",
+]
+
+LGPL_LIBRARY_VERSIONS = {
+    "libavcodec": [
+        "libavcodec.so",
+        "libavcodec.so.61",
+        "libavcodec.so.61.3.100",
+    ],
+    "libavdevice": [
+        "libavdevice.so",
+        "libavdevice.so.61",
+        "libavdevice.so.61.1.100",
+    ],
+    "libavfilter": [
+        "libavfilter.so",
+        "libavfilter.so.10",
+        "libavfilter.so.10.1.100",
+    ],
+    "libavformat": [
+        "libavformat.so",
+        "libavformat.so.61",
+        "libavformat.so.61.1.100",
+    ],
+    "libavutil": [
+        "libavutil.so",
+        "libavutil.so.59",
+        "libavutil.so.59.8.100",
+    ],
+    "libswresample": [
+        "libswresample.so",
+        "libswresample.so.5",
+        "libswresample.so.5.1.100",
+    ],
+    "libswscale": [
+        "libswscale.so",
+        "libswscale.so.8",
+        "libswscale.so.8.1.100",
+    ],
+}
+
+filegroup(
+    name = "all_srcs",
+    srcs = glob(["**"]),
+)
+
+config_setting(
+    name = "opt_mode",
+    values = {
+        "compilation_mode": "opt",
+    },
+)
+
+# NOTE FFmpeg's configure script is not autoconf-based: https://trac.ffmpeg.org/ticket/9310
+# NOTE Bazel always uses the C++ compiler: https://github.com/bazelbuild/bazel/issues/4644
+configure_make(
+    name = "ffmpeg",
+    args = [
+        "-j4",
+    ],
+    build_data = [
+        "@yasm//:yasm_bin",
+    ],
+    configure_options = [
+        "--cc=$$EXT_BUILD_ROOT/$(CC)",
+        "--host-cc=$$EXT_BUILD_ROOT/$(CC)",
+        "--cxx=$$EXT_BUILD_ROOT/$(CC)",
+        "--host-cflags=\"--sysroot=$$EXT_BUILD_ROOT/external/_main~repositories_ext~com_googleapis_storage_chrome_linux_amd64_sysroot/\"",
+        "--extra-cflags=\"--sysroot=$$EXT_BUILD_ROOT/external/_main~repositories_ext~com_googleapis_storage_chrome_linux_amd64_sysroot/\"",
+        "--pkg-config-flags=\"--static\"",
+        "--enable-pic",  # TODO base on global config setting?
+        "--disable-stripping",  # TODO define hermetic executable via --strip=
+        "--enable-shared",
+        "--disable-static",
+        "--x86asmexe=$$EXT_BUILD_ROOT/$(execpath @yasm//:yasm_bin)",
+        "--enable-version3",
+        "--enable-libaom",
+        "--enable-libsvtav1",
+        "--enable-libvpx",
+        "--enable-libdav1d",
+        "--disable-programs",
+        "--disable-doc",
+    ] + select({
+      ":opt_mode": ["--disable-debug"],
+      "//conditions:default": [],
+    }),
+    lib_source = ":all_srcs",
+    out_shared_libs = [so for lib in LGPL_LIBRARIES for so in LGPL_LIBRARY_VERSIONS[lib]],
+    deps = [
+        "@libaom",
+        "@libsvtav1",
+        "@libvpx",
+        "@libdav1d",
+    ],
+)

examples/third_party/ffmpeg/BUILD.libaom.bazel

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+load("@rules_license//rules:license.bzl", "license")
+load("@rules_foreign_cc//foreign_cc:defs.bzl", "cmake")
+
+package(
+    default_applicable_licenses = [":license"],
+    default_visibility = ["//visibility:public"],
+)
+
+exports_files(["LICENSE"])
+
+license(
+    name = "license",
+    package_name = "libaom",
+    license_kinds = [
+        "@rules_license//licenses/spdx:BSD-3-Clause",
+    ],
+    license_text = "LICENSE",
+    package_url = "https://aomedia.googlesource.com/aom",
+)
+
+filegroup(
+    name = "all_srcs",
+    srcs = glob(["**"]),
+)
+
+cmake(
+    name = "libaom",
+    build_data = [
+        "@yasm//:yasm_bin",
+    ],
+    cache_entries = {
+        "BUILD_SHARED_LIBS": "OFF",
+        "ENABLE_EXAMPLES": "OFF",
+        "ENABLE_TOOLS": "OFF",
+        "ENABLE_TESTS": "OFF",
+    },
+    env = {
+        "CMAKE_BUILD_TYPE": "Release",
+        "CMAKE_BUILD_PARALLEL_LEVEL": "4",
+        "PATH": "$$PATH:$$(dirname $(execpath @yasm//:yasm_bin))",
+    },
+    lib_source = ":all_srcs",
+    out_static_libs = ["libaom.a"],
+)

examples/third_party/ffmpeg/BUILD.libdav1d.bazel

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+load("@rules_license//rules:license.bzl", "license")
+load("@rules_foreign_cc//foreign_cc:defs.bzl", "meson")
+
+package(
+    default_applicable_licenses = [":license"],
+    default_visibility = ["//visibility:public"],
+)
+
+exports_files(["LICENSE"])
+
+license(
+    name = "license",
+    package_name = "libdav1d",
+    license_kinds = [
+        "@rules_license//licenses/spdx:BSD-3-Clause-Clear",
+    ],
+    license_text = "LICENSE",
+    package_url = "https://code.videolan.org/videolan/dav1d",
+)
+
+filegroup(
+    name = "all_srcs",
+    srcs = glob(["**"]),
+)
+
+meson(
+    name = "libdav1d",
+    build_data = [
+        "@nasm",
+    ],
+    build_args = [
+        "-j4",
+    ],
+    lib_source = ":all_srcs",
+    options = {
+        "enable_tools": "false",
+        "enable_tests": "false",
+    },
+    env = {
+        "PATH": "$$PATH:$$(dirname $(execpath @nasm))",
+    },
+    out_lib_dir = "lib64",
+    #out_shared_libs = ["libdav1d.so", "libdav1d.so.7", "libdav1d.so.7.0.0"],
+    out_static_libs = ["libdav1d.a"],
+    setup_args = [
+        "--buildtype=release",
+        "--default-library=static",
+    ],
+)

examples/third_party/ffmpeg/BUILD.libsvtav1.bazel

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+load("@rules_license//rules:license.bzl", "license")
+load("@rules_foreign_cc//foreign_cc:defs.bzl", "cmake")
+
+package(
+    default_applicable_licenses = [":license"],
+    default_visibility = ["//visibility:public"],
+)
+
+exports_files(["LICENSE"])
+
+license(
+    name = "license",
+    package_name = "libsvtav1",
+    license_kinds = [
+        "@rules_license//licenses/spdx:BSD-3-Clause-Clear",
+    ],
+    license_text = "LICENSE",
+    package_url = "https://gitlab.com/AOMediaCodec/SVT-AV1",
+)
+
+filegroup(
+    name = "all_srcs",
+    srcs = glob(["**"]),
+)
+
+cmake(
+    name = "libsvtav1",
+    build_data = [
+        "@yasm//:yasm_bin",
+    ],
+    cache_entries = {
+        "BUILD_SHARED_LIBS": "OFF",
+        "BUILD_DEC": "OFF",
+        "BUILD_APPS": "ON",
+        "BUILD_TESTING": "OFF",
+        "ENABLE_AVX512": "ON",
+    },
+    env = {
+        "CMAKE_BUILD_TYPE": "Release",
+        "CMAKE_BUILD_PARALLEL_LEVEL": "4",
+        "PATH": "$$PATH:$$(dirname $(execpath @yasm//:yasm_bin))",
+    },
+    lib_source = ":all_srcs",
+    out_binaries = ["SvtAv1EncApp"],
+    out_static_libs = ["libSvtAv1Enc.a"],
+)