Function generate_bindings

build.rs:194–243

(ffmpeg_include_dir: &Path, headers: &[PathBuf])

}

fn generate_bindings(ffmpeg_include_dir: &Path, headers: &[PathBuf]) -> Bindings {
    if !Path::new(ffmpeg_include_dir).exists() {
        panic!(
            "FFmpeg include dir: `{:?}` doesn't exits",
            ffmpeg_include_dir
        );
    }
    // Because of the strange `FP_*` in `math.h` https://github.com/rust-lang/rust-bindgen/issues/687
    let filter_callback = FilterCargoCallbacks::new(
        [
            "FP_NAN",
            "FP_INFINITE",
            "FP_ZERO",
            "FP_SUBNORMAL",
            "FP_NORMAL",
        ]
        .into_iter()
        .collect(),
    );

    // Bindgen on all avaiable headers
    headers
        .iter()
        .map(|header| ffmpeg_include_dir.join(header))
        .filter(|path| {
            let exists = Path::new(&path).exists();
            if !exists {
                eprintln!("Header path `{:?}` not found.", path);
            }
            exists
        })
        .fold(
            {
                bindgen::builder()
                    // Force impl Debug if possible(for `AVCodecParameters`)
                    .impl_debug(true)
                    .rust_target(RustTarget::stable(68, 0).ok().unwrap())
                    .parse_callbacks(Box::new(filter_callback))
                    // Add clang path, for `#include` header finding in bindgen process.
                    .clang_arg(format!("-I{}", ffmpeg_include_dir))
                    // Workaround: https://github.com/rust-lang/rust-bindgen/issues/2159
                    .blocklist_type("__mingw_ldbl_type_t")
                    // Stop bindgen from prefixing enums
                    .prepend_enum_name(false)
            },
            |builder, header| builder.header(header),
        )
        .generate()
        .expect("Binding generation failed.")
}

fn static_linking_with_libs_dir(library_names: &[&str], ffmpeg_libs_dir: &Path) {
    println!("cargo:rustc-link-search=native={}", ffmpeg_libs_dir);