chromecast-overlay

A plugin to display simple overlays for Chromecast CAF - similar to YouTube's "Annotations" feature in appearance - during video playback. This is based on the video.js overlay plugin developed by Brightcove - videojs-overlay

Maintenance Status: Stable

• Getting Started
• Documentation
  • Plugin Options
    • align
    • showBackground
    • class
    • content
    • id
    • debug
    • onReady
    • onHide
    • onShow
    • overlays
  • Examples

Getting Started

Once you've added the plugin script to your page, you can use it with any video:

<script src="path/to/chromecast-overlay.js"></script>
<script>
  overlays({
    debug: true,
    overlays: [
      {
        id: 'pause-info',
        start: cast.framework.events.EventType.PAUSE,
        end: cast.framework.events.EventType.PLAY,
        align: 'top-left'
      }
    ]
  });
</script>
...
<div id="pause-info">
  Paused
</div>

Documentation

Plugin Options

You may pass in an options object to the plugin upon initialization. This object may contain any of the following properties:

align

Type: String Default: "top-left"

This setting can be overridden by being set on individual overlay objects.

Where to display overlays, by default. Assuming the included stylesheet is used, the following values are supported: "top-left", "top", "top-right", "right", "bottom-right", "bottom", "bottom-left", "left", "all".

showBackground

Type: Boolean Default: true

This setting can be overridden by being set on individual overlay objects.

Whether or not to include background styling & padding around the overlay.

class

Type: String Default: ""

This setting can be overridden by being set on individual overlay objects.

A custom HTML class to add to each overlay element.

content

Type: String, Element, DocumentFragment Default: "This overlay will show up while the video is playing"

This setting can be overridden by being set on individual overlay objects.

The default HTML that the overlay includes.

id

Type: String Default: ""

This setting can be overridden by being set on individual overlay objects.

The id of HTML element that the overlay includes.

debug

Type: Boolean Default: false

This setting can be set when initializing the overlay objects.

Turns on debugging in the console.

onReady

Type: Function Default: undefined

This setting can be overridden by being set on individual overlay objects.

A callback function to be called when the overlay is ready.

onHide

Type: Function Default: undefined

This setting can be overridden by being set on individual overlay objects.

A callback function to be called when the overlay is hidden.

onShow

Type: Function Default: undefined

This setting can be overridden by being set on individual overlay objects.

A callback function to be called when the overlay is shown.

overlays

Type: Array Default: an array with a single example overlay

An array of overlay objects. An overlay object should consist of:

• start (String or Number): When to show the overlay. If its value is a string, it is understood as the name of an event. If it is a number, the overlay will be shown when that moment in the playback timeline is passed.
• end (String or Number): When to hide the overlay. The values of this property have the same semantics as start.

And it can optionally include align, class, and/or content to override top-level settings.

All properties are currently optional. That is, you may leave start or end off and the plugin will not complain, but you should always pass a start and an end. This will be required in a future release.

Examples

You can setup overlays to be displayed when particular events are emitted by the player, including your own custom events:

overlays({
  debug: true,
  overlays: [{

    // This overlay will appear when a video is playing and disappear when
    // the player is paused.
    id: 'play-info',
    start: cast.framework.events.EventType.PLAY,
    end: cast.framework.events.EventType.PAUSE,
    align: 'top-left'
  }, {
    // This overlay will appear when a video is pasued and disappear when
    // the player is playing again.
    id: 'pause-info',
    start: cast.framework.events.EventType.PAUSE,
    end: cast.framework.events.EventType.PLAY,
    align: 'top-left'
  }]
});

Multiple overlays can be displayed simultaneously. You probably want to specify an alignment for one or more of them so they don't overlap:

overlays({
  debug: true,
  overlays: [{
    // This overlay appears at 3 seconds and disappears at 15 seconds.
    id: 'first-interval',
    start: 3,
    end: 15,
    align: 'top'
  }, {
    // This overlay appears at 7 seconds and disappears at 22 seconds.
    id: 'second-interval',
    start: 7,
    end: 22,
    align: 'bottom'
  }]
});