mediadecode-webcodecs 0.2.0

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WebCodecs adapter for the mediadecode abstraction layer, built on top of web-sys.

Implements mediadecode's VideoAdapter and AudioAdapter traits (plus the matching push-style *StreamDecoder traits) on top of the browser's WebCodecs API.

Target

This crate is wasm32-only. On non-wasm32 targets it compiles to an empty stub so the workspace cargo build / cargo check continue to work in native dev loops.

Status: scaffolded, public API not yet released. Track the CHANGELOG for the first published version.

# Once published. Until then consume via git or path dep.
[dependencies]
mediadecode-webcodecs = "0.0"

Built and run via wasm-bindgen on wasm32-unknown-unknown. The crate intentionally does not implement SubtitleAdapter — WebCodecs has no subtitle surface; captions live in JavaScript-side parsers.

Required cfg flag

web-sys gates the WebCodecs APIs behind --cfg web_sys_unstable_apis because the WebIDL is not yet stable across all browsers. Add the flag to your project's .cargo/config.toml:

[target.wasm32-unknown-unknown]
rustflags = ["--cfg=web_sys_unstable_apis"]

…or set RUSTFLAGS="--cfg=web_sys_unstable_apis" in your build environment / CI. Without the flag, the crate emits an explicit compile_error! pointing here.

Bindings

There is no high-level WebCodecs wrapper crate that meets the ergonomics bar; the crate uses web-sys directly as the FFI layer (the same source videocall.rs, livekit-rust, and other active WebCodecs Rust users build on) and layers an idiomatic mediadecode-shaped surface on top.

License

mediadecode-webcodecs is under the terms of both the MIT license and the Apache License (Version 2.0).

See LICENSE-APACHE, LICENSE-MIT for details.