skylineos
Skyline CLSP Player
An html5 CLSP video player. CLSP is a proprietary near-real-time video streaming protocol only available via Skyline's SFS solutions.
Table of Contents
Supported Browsers
Desktop
- Google Chrome 53+
- Mozilla Firefox 70+
- Microsoft Edge 80+ (Chromium-based)
All other desktop browsers are currently not supported.
Mobile
@todo
CLSP Streams
The highest h.264 keyframe/iframe segment frequency this player currently supports is 2 per second (this is different from frames per second).
URL Structure
The network protocol is handled by specifying the following URI format:
[clsp protocol] :// [sfs-host] : [port-number-of-web-socket] / [stream-name]
clsp protocol:clsporclspssfs-host: the host (or ip address) of the Skyline SFSport-number-of-web-socket: optional, @see Default Portstream-name: the stream name as defined on the Skyline SFS
Example stream url:
clsp://sfs.somecity.com/CityFeedVideo0652
Note that many Skyline SFS production LTS deployments use a default port of 9001. To accomodate for this, you do not necessarilly need to append the port 9001 to every clsp url. You can use the utility method utils.setDefaultStreamPort, which is documented below.
Tokenization
Control stream access via jwt tokens.
JWT
The JWT authorization method provides authorization as well as stream access time.
clsps://[sfs-host]:[port-number-of-web-socket]/[stream-name]
?token=[jwt-token]sfs-host: the host (or ip address) of the Skyline SFSport-number-of-web-socket: required, @see Default Portstream-name: the stream name as defined on the Skyline SFStoken: contains a jwt token with the expiration claim, signed by the shared secret
The token is created by the stream manager. A shared secret exists between the stream manager and Skyline SFS(s) You will need to work with Skyline to configure and use jwt token support.
Default Port
| protocol / SFS version | >= v5.2.0 | < v5.2.0 |
|---|---|---|
clsp |
80 | 9001 |
clsps |
443 | 443 |
Note that many Skyline SFS production LTS deployments use a default port of 9001. To accomodate for this, you do not necessarilly need to append the port 9001 to every clsp url. You can use the utility method utils.setDefaultStreamPort, which is documented below.
Installation
Via Yarn
yarn add @skylineos/clsp-playerVia NPM
Note that installation /use via yarn is recommended as it is what we use for development, testing, and dependency management.
npm i @skylineos/clsp-playerUse
via <script> tag
NOTE: See demos/single-player/ and demos/advanced-dist/ for full examples.
A CLSP object is attached to window, which contains the classes and utils you need to create players.
<head> Tag
<head>
<!-- load CLSP Player styles -->
<link
rel="stylesheet"
href="/path/to/dist/clsp-player.css"
>
<head><script> Tag
<!-- load CLSP Player in `head` or `body` -->
<script src="/path/to/dist/clsp-player.min.js"></script>
<!-- use CLSP Player at end of `body` -->
<script>
let videoElementId = 'my-video';
let urls = [
'clsps://bd-demo-sfs1.skyvdn.com/testpattern',
'clsps://bd-demo-sfs1.skyvdn.com/testpattern',
];
// If you are using a Skyline SFS that uses a default CLSP stream port that
// isn't `80` (e.g. SFS < v5.2.0), you may set the window-level default port
// for `clsp` streams:
window.CLSP.utils.setDefaultStreamPort('clsp', 9001);
// Construct the player collection
let iovCollection = window.CLSP.IovCollection.asSingleton();
// Instantiate the iov instance for the target video element
let iov = iovCollection.create({
videoElementId: videoElementId,
})
// play a CLSP stream with the iov instance
iov.changeSrc(urls[0])
.then(/*..*/)
.catch(/*..*/);
</script><video> tag
We recommend wrapping the video tag in a container element (e.g. div) that the CLSP Player can mutate as needed. The CLSP Player needs to perform some actions on the video element as well as its container.
Note that for clsp streams, the src tag must have a type attribute with a value of video/mp4; codecs='avc1.42E01E'.
This tells the browser exactly what codec to use to decode and play the video. H.264 baseline 3.0 is a least common denominator codec supported on all browsers (according to the MSE development page).
<div class="video-container">
<div class="clsp-player-container clsp-container-fit">
<video id="my-video"></video>
</div>
</div>via import or require
NOTE: See demos/single-player/ and demos/advanced-src/ for full examples.
JS
import {
IovCollection,
utils,
} from '@skylineos/clsp-player';
const videoElementId = 'my-video';
const urls = [
'clsps://bd-demo-sfs1.skyvdn.com/testpattern',
'clsps://bd-demo-sfs1.skyvdn.com/testpattern',
];
try {
// If you are using a Skyline SFS that uses a default CLSP stream port that
// isn't `80` (e.g. SFS < v5.2.0), you may set the window-level default port
// for `clsp` streams:
utils.setDefaultStreamPort('clsp', 9001);
// Construct the player collection
const iovCollection = IovCollection.asSingleton();
// Instantiate the iov instance for the target video element
const iov = iovCollection.create({ videoElementId });
// play a CLSP stream with the iov instance
await iov.changeSrc(urls[0]);
}
catch (error) {
// do something with the error
console.error(error);
}Styles
@import '/path/to/node_modules/@skylineos/clsp-player/dist/clsp-player.css';
// or import it from src
@import '/path/to/node_modules/@skylineos/clsp-player/src/styles/clsp-player.css';<video> tag
We recommend wrapping the video tag in a container element (e.g. div) that the CLSP Player can mutate as needed. The CLSP Player needs to perform some actions on the video element as well as its container.
<!-- The outer container used for your styling -->
<div class="video-container">
<!-- The inner container used by CLSP for styling and other operations -->
<div class="clsp-player-container clsp-container-fit">
<video id="my-video"></video>
</div>
</div>Known Issues
Videos appear to have a low framerate
During testing, we have encountered an issue where a large number of CLSP streams ( > 30 ) played on a single page in Chrome can appear choppy or to have a low framerate. This same test / demo works without issue on other machines, or in Firefox.
The underlying symptom appears to be a large number ( > 50 ) of Style recalcs / sec as reported by the Chrome Performance Monitor. This high number has only been observed in Chrome with specific video cards and with hardware acceleration enabled (which is the default setting).
This appears to be a bug in the Chrome browser, and there are anecdotal reports of this behavior online starting from early 2019, but no official bug report that we are aware of.
At the moment, the only known workarounds are to disable hardware acceleration in Chrome's settings, try using the Firefox browser, or try using a different video card.