Adra

A secure MP3 encoder, powered by Web Assembly. Try it out.

How does it work?

The underlying tech stack is based on the following:

• libmp3lame, a classic C library for encoding audio to MP3
• emscripten is used to compile libmp3lame and C code to Web Assembly.
• Web Assembly runs native code on the client, allowing us to do memory-heavy stuff in the browser.
• All the emscripten web assembly action is done in Docker, for better portability and C lang dependency management.
• Frontend offloads the web assembly operations to web workers for better performance.
• Frontend built with React, Emotion, and Parcel Bundler

Prerequisites

• yarn v1.0.0 or higher
• docker
• GNU make

Commands

• make install - install docker deps and frontend deps
• make build-docker - builds the docker image, the environment for emscripten to run in, compiles libmp3lame
• make build-wasm - compiles the web assembly + javascript wrapper
• yarn start - run the dev server, open http://localhost:1234/ to see the app running
• yarn build - build and prerender for prod deployment

If you experience inconveniently long install times, please try running this command before make install:

export PUPPETEER_SKIP_CHROMIUM_DOWNLOAD=true