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Event-driven JavaScript library that enables MIDI playback in the browser.

-   Check out [examples with React](https://midi.yvesgurcan.com/example/react/) and [with vanilla JavaScript](https://midi.yvesgurcan.com/example/javascript/).
-   See the [NPM package](https://npmjs.com/package/web-midi-player) and the [GPR package](https://github.com/yvesgurcan/web-midi-player/packages/92236).
-   Read the [API documentation](https://midi.yvesgurcan.com/doc/).
-   Look at the [source code](https://github.com/yvesgurcan/web-midi-player).
-   Download [instrument patches](https://github.com/yvesgurcan/midi-instrument-patches/releases/latest/download/patches.zip).
-   Want to help? Solve an [issue](https://github.com/yvesgurcan/web-midi-player/issues).

**We're looking for contributors! Find an issue on our [Kanban board](https://github.com/yvesgurcan/web-midi-player/projects/1) and assign it to yourself.**

## Install

### NPM

This library can be installed via [NPM](https://docs.npmjs.com/about-npm/), using the default registry:

    npm i web-midi-player

Alternatively, you can set up `npm` to use [GPR](https://github.com/features/packages) to install the library. The dependency can be then installed like this:

    npm i @yvesgurcan/web-midi-player

Whichever registry you've used, you can then use ES module syntax to load the dependency.

    import MidiPlayer from 'web-midi-player';

Or use the CommonJS module system.

    const MidiPlayer = require('web-midi-player');

### CDN

Alternatively, you can add this library to your project with a `script` tag.

    <script src="https://cdn.jsdelivr.net/npm/web-midi-player@latest/index.js"></script>

The library will be accessible under `window['web-midi-player'].default`.

    <script>
        const { 'web-midi-player': { default: MidiPlayer } } = window;
    </script>

## Getting started

**This package requires MIDI instrument patches compatible with [Timidity](https://sourceforge.net/projects/timidity/) (`.pat` files) in order to play audio.**

By default, the player loads [instrument patches via the jsDeliver CDN](https://www.jsdelivr.com/package/npm/midi-instrument-patches).

    const midiPlayer = new MidiPlayer();
    midiPlayer.play({ url: 'song.mid' });

Alternatively, you can [download instrument patches and add them to your project](https://github.com/yvesgurcan/midi-instrument-patches/releases/latest/download/patches.zip). Make sure to provide the path to the uncompressed files when instantiating the MIDI player.

    const midiPlayer = new MidiPlayer({ patchUrl: 'public/patches/' });
    midiPlayer.play({ url: 'song.mid' });

## Browser compatibility

This library relies on the [Web Audio API](https://developer.mozilla.org/en-US/docs/Web/API/Web_Audio_API) and more specifically the [AudioContext interface](https://developer.mozilla.org/en-US/docs/Web/API/AudioContext) to control MIDI playback. This library will not function as expected with [browsers that do not fully support this API](https://caniuse.com/#search=audiocontext).

It is currently not possible to use Web Midi Player with any version of Internet Explorer.

## Contributing

Make sure to read our [code of conduct](https://github.com/yvesgurcan/web-midi-player/blob/master/CODE_OF_CONDUCT.md) first.

Something doesn't work? We want to know! Create a [new issue](https://github.com/yvesgurcan/web-midi-player/issues/new).

Want a new feature? Awesome! Open a [pull request](https://github.com/yvesgurcan/web-midi-player/compare).

### Setup

Clone the repository.

    git clone https://github.com/yvesgurcan/web-midi-player

Install dependencies.

    npm i

Start development server.

    npm start

### Continuous integration / Continuous development

This repository uses GitHub Actions to [automate certain tasks](.github/workflows) such as creating releases, publishing to NPM, and running tests.

## Related projects

This library was created with the help of:

-   The [libTiMidity](http://libtimidity.sourceforge.net) library.
-   WebAssembly code generated thanks to [Emscripten](https://github.com/emscripten-core/emscripten).
-   Code written for [MIDIjs](http://www.midijs.net/). The source code can be found in the [babelsberg-js](https://github.com/babelsberg/babelsberg-js/tree/master/midijs) project.
-   MIDI instrument patches that can be found in a [separate repository](https://github.com/yvesgurcan/midi-instrument-patches).