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# ![hls.js](https://cloud.githubusercontent.com/assets/616833/19739063/e10be95a-9bb9-11e6-8100-2896f8500138.png)

hls.js is a JavaScript library which implements an [HTTP Live Streaming] client.
It relies on [HTML5 video][] and [MediaSource Extensions][] for playback.

It works by transmuxing MPEG-2 Transport Stream and AAC/MP3 streams into ISO BMFF (MP4) fragments.
This transmuxing could be performed asynchronously using [Web Worker] if available in the browser.
hls.js also supports HLS + fmp4, as announced during [WWDC2016](https://developer.apple.com/videos/play/wwdc2016/504/)

hls.js does not need any player, it works directly on top of a standard HTML```<video>```element.

hls.js is written in [ECMAScript6] (`*.js`) and [TypeScript] (`*.ts`) (strongly typed superset of ES6), and transpiled in ECMAScript5 using the [TypeScript compiler].

Modules written in TS and plain JS/ES6 can be interdependent and imported/required by each other.

To build our distro bundle and serve our development environment we use [Webpack].

[HTML5 video]: http://www.html5rocks.com/en/tutorials/video/basics/
[MediaSource Extensions]: http://w3c.github.io/media-source/
[HTTP Live Streaming]: http://en.wikipedia.org/wiki/HTTP_Live_Streaming
[Web Worker]: http://caniuse.com/#search=worker
[ECMAScript6]: https://github.com/ericdouglas/ES6-Learning#articles--tutorials
[TypeScript]: https://www.typescriptlang.org/
[TypeScript compiler]: https://www.typescriptlang.org/docs/handbook/compiler-options.html
[Webpack]: https://webpack.js.org/

## API docs and usage guide

* [API and usage docs, with code examples](./docs/API.md)

* [Auto-Generated Docs (Latest Release)](https://hls-js.netlify.com/api-docs)
* [Auto-Generated Docs (Master)](https://hls-js-latest.netlify.com/api-docs)

_Note you can access the docs for a particular version using "[https://github.com/video-dev/hls.js/blob/deployments/README.md](https://github.com/video-dev/hls.js/blob/deployments/README.md)"_

## Demo

### Latest Release
[https://hls-js.netlify.com/demo](https://hls-js.netlify.com/demo)

### Master
[https://hls-js-latest.netlify.com/demo](https://hls-js-latest.netlify.com/demo)

### Specific Version
Find the commit on [https://github.com/video-dev/hls.js/blob/deployments/README.md](https://github.com/video-dev/hls.js/blob/deployments/README.md).


## Getting Started

```html
<script src="https://cdn.jsdelivr.net/npm/hls.js@latest"></script>
<!-- Or if you want a more recent canary version -->
<!-- <script src="https://cdn.jsdelivr.net/npm/hls.js@canary"></script> -->
<video id="video"></video>
<script>
  var video = document.getElementById('video');
  var videoSrc = 'https://test-streams.mux.dev/x36xhzz/x36xhzz.m3u8';
  if (Hls.isSupported()) {
    var hls = new Hls();
    hls.loadSource(videoSrc);
    hls.attachMedia(video);
    hls.on(Hls.Events.MANIFEST_PARSED, function() {
      video.play();
    });
  }
  // hls.js is not supported on platforms that do not have Media Source Extensions (MSE) enabled.
  // When the browser has built-in HLS support (check using `canPlayType`), we can provide an HLS manifest (i.e. .m3u8 URL) directly to the video element through the `src` property.
  // This is using the built-in support of the plain video element, without using hls.js.
  // Note: it would be more normal to wait on the 'canplay' event below however on Safari (where you are most likely to find built-in HLS support) the video.src URL must be on the user-driven
  // white-list before a 'canplay' event will be emitted; the last video event that can be reliably listened-for when the URL is not on the white-list is 'loadedmetadata'.
  else if (video.canPlayType('application/vnd.apple.mpegurl')) {
    video.src = videoSrc;
    video.addEventListener('loadedmetadata', function() {
      video.play();
    });
  }
</script>
```

## Video Control

Video is controlled through HTML ```<video>``` element.

HTMLVideoElement control and events could be used seamlessly.

## They use hls.js in production!

|[<img src="http://i.cdn.turner.com/adultswim/big/img/global/adultswim.jpg" width="120">](http://www.adultswim.com/videos/streams)|[<img src="https://www.akamai.com/fr/fr/multimedia/images/logo/akamai-logo.png" width="120">](https://www.akamai.com)|[<img src="https://upload.wikimedia.org/wikipedia/commons/thumb/1/1a/Canal%2B.svg/2000px-Canal%2B.svg.png" width="120">](https://www.canalplus.fr)|[<img src="https://avatars2.githubusercontent.com/u/115313" width="120">](http://www.dailymotion.com)|
|---|---|---|---|
|[<img src="https://user-images.githubusercontent.com/4006693/44003595-baff193c-9e8f-11e8-9848-7bb91563499f.png" width="120">](https://freshlive.tv)|[<img src="https://flowplayer.org/media/img/logo-blue.png" width="120">](http://www.flowplayer.org)|[<img src="https://avatars1.githubusercontent.com/u/12554082?s=240" width="120">](https://www.foxsports.com.au)|[<img src="https://cloud.githubusercontent.com/assets/244265/12556435/dfaceb48-c353-11e5-971b-2c4429725469.png" width="120">](http://www.globo.com)|
|[<img src="https://images.gunosy.com/logo/gunosy_icon_company_logo.png" width="120">](https://gunosy.com)|[<img src="https://user-images.githubusercontent.com/1480052/35802840-f8e85b8a-0a71-11e8-8eb2-eee323e3f159.png" width="120">](https://www.gl-systemhaus.de/)|[<img src="https://cloud.githubusercontent.com/assets/6525783/20801836/700490de-b7ea-11e6-82bd-e249f91c7bae.jpg" width="120">](http://nettrek.de/)|[<img src="https://cloud.githubusercontent.com/assets/244265/12556385/999aa884-c353-11e5-9102-79df54384498.png" width="120">](https://www.nytimes.com/)|
|[<img src="https://cloud.githubusercontent.com/assets/1798553/20356424/ba158574-ac24-11e6-95e1-1ae591b11a0a.png" width="120">](https://www.peer5.com/)|[<img src="https://cloud.githubusercontent.com/assets/4909096/20925062/e26e6fc8-bbb4-11e6-99a5-d4762274a342.png" width="120">](http://qbrick.com/)|[<img src="https://www.radiantmediaplayer.com/images/radiantmediaplayer-new-logo-640.jpg" width="120">](https://www.radiantmediaplayer.com/)|[<img src="https://www.rts.ch/hummingbird-static/images/logos/logo_marts.svg" width="120">](http://www.rts.ch/)|
|[<img src="https://cloud.githubusercontent.com/assets/12702747/19316434/0a3601de-9067-11e6-85e2-936b1cb099a0.png" width="120">](https://www.snapstream.com/)|[<img src="https://www.streamamg.com/wp-content/themes/barebones/_assets/images/streamamg-logo.png" width="120">](https://www.streamamg.com/)|[<img src="https://streamsharkio.sa.metacdn.com/wp-content/uploads/2015/10/streamshark-dark.svg" width="120">](https://streamshark.io/)|[<img src="https://camo.githubusercontent.com/9580f10e9bfa8aa7fba52c5cb447bee0757e33da/68747470733a2f2f7777772e7461626c6f74762e636f6d2f7374617469632f696d616765732f7461626c6f5f6c6f676f2e706e67" width="120">](http://my.tablotv.com/)|
|[<img src="https://user-images.githubusercontent.com/2803310/34083705-349c8fd0-e375-11e7-92a6-5c38509f4936.png" width="120">](https://www.streamroot.io/)|[<img src="http://vignette1.wikia.nocookie.net/tedtalks/images/c/c0/TED_logo.png/revision/20150915192527" width="120">](https://www.ted.com/)|[<img src="https://www.seeklogo.net/wp-content/uploads/2014/12/twitter-logo-vector-download.jpg" width="120">](https://twitter.com/)|[<img src="https://player.clevercast.com/img/clevercast.png" width="120">](https://www.clevercast.com)|
|[<img src="https://player.mtvnservices.com/edge/hosted/Viacom_logo.svg" width="120">](https://www.viacom.com/)|[<img src="https://user-images.githubusercontent.com/1181974/29248959-efabc440-802d-11e7-8050-7c1f4ca6c607.png" width="120">](https://vk.com/)|[<img src="https://s3.amazonaws.com/uploads.hipchat.com/87223/4876411/7Rybnl26ReFzlt3/jw-logo-red.png" width="120">](https://www.jwplayer.com)|[<img src="https://staticftv-a.akamaihd.net/arches/francetv/default/img/og-image.jpg?20161007" width="120">](https://www.france.tv)|
|[<img src="http://showmax.akamaized.net/e/logo/showmax_black.png" width="120">](https://tech.showmax.com)|[<img src="https://static3.1tv.ru/assets/web/logo-ac67852f1625b338f9d1fb96be089d03557d50bfc5790d5f48dc56799f59dec6.svg" width="120" height="120">](https://www.1tv.ru/) | [<img src="https://user-images.githubusercontent.com/1480052/40482633-c013ebce-5f55-11e8-96d5-b776415de0ce.png" width="120">](https://www.zdf.de) | [<img src="https://github.com/cdnbye/hlsjs-p2p-engine/blob/master/figs/cdnbye.png" width="120">](https://github.com/cdnbye/hlsjs-p2p-engine)| |
|[<img src="https://streaming.cdn77.com/live-streaming-logo-dark.png" width="120">](https://streaming.cdn77.com/)| [<img src="https://avatars0.githubusercontent.com/u/7442371?s=200&v=4" width="120">](https://r7.com/)|[<img src="https://raw.githubusercontent.com/Novage/p2p-media-loader/gh-pages/images/p2pml-logo.png" width="120">](https://github.com/Novage/p2p-media-loader)|[<img src="https://avatars3.githubusercontent.com/u/45617200?s=400" width="120">](https://kayosports.com.au)
|[<img src="https://avatars1.githubusercontent.com/u/5279615?s=400&u=9771a216836c613f1edf4afe71cfc69d4c5657ed&v=4" width="120">](https://flosports.tv)


## Player Integration

hls.js is (being) integrated in the following players:

 - [Akamai Adaptive Media Player (AMP)](https://www.akamai.com/us/en/solutions/products/media-delivery/adaptive-media-player.jsp)
 - [Clappr](https://github.com/clappr/clappr)
 - [Flowplayer](https://www.flowplayer.org)  through [flowplayer-hlsjs](https://github.com/flowplayer/flowplayer-hlsjs)
 - [MediaElement.js](http://www.mediaelementjs.com)
 - [Videojs](http://videojs.com) through [Videojs-hlsjs](https://github.com/benjipott/videojs-hlsjs)
 - [Videojs](http://videojs.com) through [videojs-hls.js](https://github.com/streamroot/videojs-hls.js). hls.js is integrated as a SourceHandler -- new feature in Video.js 5.
 - [Videojs](http://videojs.com) through [videojs-contrib-hls.js](https://github.com/Peer5/videojs-contrib-hls.js). Production ready plug-in with full fallback compatibility built-in.
 - [Fluid Player](https://www.fluidplayer.com)
 - [OpenPlayerJS](https://www.openplayerjs.com), as part of the [OpenPlayer project](https://github.com/openplayerjs)
- [CDNBye](https://github.com/cdnbye/hlsjs-p2p-engine), a p2p engine for hls.js powered by WebRTC Datachannel.

## Chrome/Firefox integration

made by [gramk](https://github.com/gramk/chrome-hls), plays hls from address bar and m3u8 links

 - Chrome [native-hls](https://chrome.google.com/webstore/detail/native-hls-playback/emnphkkblegpebimobpbekeedfgemhof)
 - Firefox [native-hls](https://addons.mozilla.org/en-US/firefox/addon/native_hls_playback/)

## Dependencies

No external JS libs are needed.
Prepackaged build is included [with the releases](https://github.com/video-dev/hls.js/releases).

If you want to bundle the application yourself, use node

```
npm install hls.js
```
or for the version from master (canary)
```
npm install hls.js@canary
```

**NOTE:** `hls.light.*.js` dist files do not include subtitling and alternate-audio features.

## Installation

Either directly include dist/hls.js or dist/hls.min.js

Or type

```sh
npm install --save hls.js
```

Optionally there is a declaration file available to help with code completion and hinting within your IDE for the hls.js api

```sh
npm install --save-dev @types/hls.js
```

## Compatibility

hls.js is compatible with browsers supporting MediaSource extensions (MSE) API with 'video/MP4' mimetypes inputs.

Find a support matrix of the MediaSource API here: https://developer.mozilla.org/en-US/docs/Web/API/MediaSource

As of today, it is supported on:

 * Chrome for Android 34+
 * Chrome for Desktop 34+
 * Firefox for Android 41+
 * Firefox for Desktop 42+
 * IE11+ for Windows 8.1+
 * Edge for Windows 10+
 * Opera for Desktop
 * Vivaldi for Desktop
 * Safari for Mac 8+ (beta)

Please note: iOS Safari "Mobile" does not support the MediaSource API. Safari browsers have however built-in HLS support through the plain video "tag" source URL. See the example above (Getting Started) to run appropriate feature detection and choose between using Hls.js or natively built-in HLS support.

When a platform has neither MediaSource nor native HLS support, you will not be able to play HLS.

### Server-side-rendering (SSR) and `require` from a Node.js runtime

We support this now. You can safely require this library in Node and absolutely nothing will happen :) See https://github.com/video-dev/hls.js/pull/1841

(This is also known as "Universal builds" and "isomorphic apps")

## CORS

All HLS resources must be delivered with [CORS headers](https://developer.mozilla.org/en-US/docs/Web/HTTP/Access_control_CORS) permitting `GET` requests.

## Features

  - VoD & Live playlists
    - DVR support on Live playlists
  - fragmented MP4 container (beta)
  - MPEG-2 TS container
    - ITU-T Rec. H.264 and ISO/IEC 14496-10 Elementary Stream
    - ISO/IEC 13818-7 ADTS AAC Elementary Stream
    - ISO/IEC 11172-3 / ISO/IEC 13818-3 (MPEG-1/2 Audio Layer III) Elementary Stream
    - Packetized metadata (ID3v2.3.0) Elementary Stream
  - AAC container (audio only streams)
  - MPEG Audio container (MPEG-1/2 Audio Layer III audio only streams)
  - Timed Metadata for HTTP Live Streaming (in ID3 format, carried in MPEG-2 TS)
  - AES-128 decryption
  - SAMPLE-AES decryption (only supported if using MPEG-2 TS container)
  - Encrypted media extensions (EME) support for DRM (digital rights management)
    - Widevine CDM (beta/experimental) (see Shaka-package test-stream in demo)
  - CEA-608/708 captions
  - WebVTT subtitles
  - Alternate Audio Track Rendition (Master Playlist with alternative Audio) for VoD and Live playlists
  - Adaptive streaming
    - Manual & Auto Quality Switching
      - 3 Quality Switching modes are available (controllable through API means)
      	- Instant switching (immediate quality switch at current video position)
      	- Smooth switching (quality switch for next loaded fragment)
      	- Bandwidth conservative switching (quality switch change for next loaded fragment, without flushing the buffer)
      - In Auto-Quality mode, emergency switch down in case bandwidth is suddenly dropping to minimize buffering.
  - Accurate Seeking on VoD & Live (not limited to fragment or keyframe boundary)
  - Ability to seek in buffer and back buffer without redownloading segments
  - Built-in Analytics
    - Every internal events could be monitored (Network Events,Video Events)
    - Playback session metrics are also exposed
  - Resilience to errors
    - Retry mechanism embedded in the library
    - Recovery actions could be triggered fix fatal media or network errors
  - [Redundant/Failover Playlists](https://developer.apple.com/library/ios/documentation/NetworkingInternet/Conceptual/StreamingMediaGuide/UsingHTTPLiveStreaming/UsingHTTPLiveStreaming.html#//apple_ref/doc/uid/TP40008332-CH102-SW22)

## Not Supported (Yet)
  - MP3 Elementary Stream in Edge for Windows 10+

### Supported M3U8 tags

  - `#EXTM3U`
  - `#EXTINF`
  - `#EXT-X-STREAM-INF` (adaptive streaming)
  - `#EXT-X-ENDLIST` (Live playlist)
  - `#EXT-X-MEDIA-SEQUENCE`
  - `#EXT-X-TARGETDURATION`
  - `#EXT-X-DISCONTINUITY`
  - `#EXT-X-DISCONTINUITY-SEQUENCE`
  - `#EXT-X-BYTERANGE`
  - `#EXT-X-MAP`
  - `#EXT-X-KEY` (https://tools.ietf.org/html/draft-pantos-http-live-streaming-08#section-3.4.4)
  - `#EXT-X-PROGRAM-DATE-TIME` (https://tools.ietf.org/html/draft-pantos-http-live-streaming-18#section-4.3.2.6)
  - `EXT-X-START:TIME-OFFSET=x` (https://tools.ietf.org/html/draft-pantos-http-live-streaming-18#section-4.3.5.2)

## License

  hls.js is released under [Apache 2.0 License](LICENSE)

## Development and contributing - first steps

Pull requests are welcome. Here is a quick guide on how to start.

 - First, checkout the repository and install required dependencies
```sh
git clone https://github.com/video-dev/hls.js.git
# setup dev environment
cd hls.js
npm install
# build dist/hls.js, watch file change for rebuild and launch demo page
npm run dev
# lint
npm run lint
```
 - Use [EditorConfig](http://editorconfig.org/) or at least stay consistent to the file formats defined in the `.editorconfig` file.
 - Develop in a topic branch, not master
 - Don't commit the updated `dist/hls.js` file in your PR. We'll take care of generating an updated build right before releasing a new tagged version.

## Setup

After cloning or pulling from the repository, first of all, make sure your local node-modules are up-to-date with the package deps:

```
npm install
```

## Build system (Webpack)

Build all flavors:
```
npm install
npm run build
```

Only debug:
```
npm run build:debug
```

Build and watch
```
npm run build:watch
```

Only specific flavor (known configs are: debug, dist, light, light-dist, demo):
```
npm run build -- --env.dist # replace "dist" by other configuration name, see above ^
```
Note: The "demo" config is always built.

Build with bundle analyzer (to help optimize build size)
```
npm run build:analyze
```

## Linter (ESlint)

Run linter:
```
npm run lint
```

Run linter with auto-fix mode:
```
npm run lint:fix
```

Run linter with errors only (no warnings)
```
npm run lint:quiet
```

## Automated tests (Mocha/Karma)

Run all tests at once:
```
npm test
```

Run unit tests:
```
npm run test:unit
```


Run unit tests in watch mode:
```
npm run test:unit:watch
```

Run functional (integration) tests:
```
npm run test:func
```

## Design

Click [here](/docs/design.md) for details.

### Tested With

[<img src="https://cloud.githubusercontent.com/assets/7864462/12837037/452a17c6-cb73-11e5-9f39-fc96893bc9bf.png" alt="Browser Stack Logo" width="300">](https://www.browserstack.com/)
