API Reference

This page contains reference documentation for the interaction points between videojs-contrib-ads and ad plugins that use it. All methods are called on player.ads; for example, player.ads.isInAdMode(). All events are triggered or listened to on the player object; for example player.trigger('nopreroll') or player.on('readyforpreroll', () => {...}).

Informational methods and events

isInAdMode() (METHOD) -- Returns true if the player is in ad mode.
isWaitingForAdBreak() (METHOD) -- This method returns true during ad mode if an ad break hasn't started yet.
inAdBreak() (METHOD) -- This method returns true after startLinearAdMode and before endLinearAdMode. This is the part of ad mode when an ad plugin may play ads.
isContentResuming() (METHOD) -- This method returns true during ad mode after an ad break has ended but before content has resumed playing.
adstart (EVENT) -- This event is fired directly as a consequence of calling startLinearAdMode().
adend (EVENT) -- This event is fired directly as a consequence of calling endLinearAdMode().
adskip (EVENT) -- This event is fired directly as a consequence of calling skipLinearAdMode().

How contrib-ads talks to your ad plugin

Your ad plugin will listen to these events to trigger its behaviors. See Getting Started for more information.

readyforpreroll (EVENT) -- Indicates that your ad plugin may start a preroll ad break by calling startLinearAdMode.
readyforpostroll (EVENT) -- Indicates that your ad plugin may start a postroll ad break by calling startLinearAdMode.
adtimeout (EVENT) -- A timeout managed by videojs-contrib-ads has expired and regular video content has begun to play. Ad plugins have a fixed amount of time to start an ad break when an opportunity arises. For example, if the ad plugin is blocked by network conditions or an error, this event will fire and regular playback will resume rather than the player stalling indefinitely.
contentchanged (EVENT) -- Fires when a new content video has been loaded in the player (specifically, at the same time as the loadstart media event for the new source). This means the ad workflow has restarted from the beginning. Your ad plugin will need to trigger adsready again, for example. Note that when changing sources, the playback state of the player is retained: if the previous source was playing, the new source will also be playing and the ad workflow will not wait for a new play event.

How your ad plugin talks to contrib-ads

Your ad plugin can invoke these methods and events to play (or skip) ads. See Getting Started for more information.

adsready (EVENT) -- Trigger this event to indicate that the ad plugin is ready to play prerolls. readyforpreroll will not be sent until after you trigger adsready, but it may not be sent right away (for example, if the user has not clicked play yet). A timeout can occur while waiting for adsready. You will need to trigger adsready again if you load a new content source.
startLinearAdMode() (METHOD) -- Invoke this method to start an ad break.
- For a preroll ad, you can invoke startLinearAdMode after the readyforpreroll event if isWaitingForAdBreak() is true.
- For a midroll ad, you can invoke startLinearAdMode during content playback if isInAdMode() is false.
- For a postroll ad, you can invoke startLinearAdMode after the readyforpostroll event if isWaitingForAdBreak() is true.
ads-ad-started (event) -- Trigger this event during an ad break to indicate that an ad has actually started playing. This will hide the loading spinner. It is possible for an ad break to end without playing any ads.
endLinearAdMode() (method) -- Invoke this method to end an ad break. This will cause content to resume. You can check if an ad break is active using inAdBreak().
skipLinearAdMode() (METHOD) -- At a time when startLinearAdMode() is expected, calling skipLinearAdMode() will immediately resume content playback instead.
nopreroll (EVENT) -- You can trigger this event even before readyforpreroll to indicate that no preroll will play. The ad plugin will not check for prerolls and will instead begin content playback after the play event (or immediately, if playback was already requested).
nopostroll (EVENT) -- Similar to nopreroll, you can trigger this event even before readyforpostroll to indicate that no postroll will play. The ad plugin will not wait for a postroll to play and will instead immediately trigger the ended event.
contentresumed (EVENT) - If your ad plugin does not result in a "playing" event when resuming content after an ad, send this event to signal that content has resumed. This was added to support stitched ads and is not normally necessary because content will result in a playing event when it resumes.

Advanced Properties

Once the plugin is initialized, there are a couple properties you can access modify its behavior.

contentSrc

In order to detect changes to the content video, videojs-contrib-ads monitors the src attribute of the player. If you need to make a change to the src attribute during content playback that should not be interpreted as loading a new video, you can update this property with the new source you will be loading:

// you might want to switch from a low bitrate version of a video to a
// higher quality one at the user's request without forcing them to
// re-watch all the ad breaks they've already viewed

// first, you'd update contentSrc on the ads plugin to the URL of the
// higher bitrate rendition:
player.ads.contentSrc = 'movie-high.mp4';

// then, modify the src attribute as usual
player.src('movie-high.mp4');

disableNextSnapshotRestore

Advanced option. Prevents videojs-contrib-ads from restoring the previous video source.

If you need to change the video source during an ad break, you can use disableNextSnapshotRestore to prevent videojs-contrib-ads from restoring the snapshot from the previous video source.

if (player.ads.inAdBreak()) {
    player.ads.disableNextSnapshotRestore = true;
    player.src('another-video.mp4');
}

Deprecated

The following are slated for removal from contrib-ads and will have no special behavior once removed. These should no longer be used in integrating ad plugins. Replacements are provided for matching functionality that will continue to be supported.

contentupdate (EVENT) -- In the future, contrib-ads will no longer trigger this event. Listen to the new contentchanged event instead; it is is more reliable.
adscanceled (EVENT) -- In the future, this event will no longer result in special behavior in contrib-ads. It was intended to cancel all ads, but it was never fully implemented. Instead, trigger nopreroll and nopostroll.
adserror (EVENT) -- In the future, this event will no longer result in special behavior in contrib-ads. Today, this event skips prerolls when seen before a preroll ad break. It skips postrolls if seen after readyforpostroll and before a postroll ad break. It ends linear ad mode if seen during an ad break. These behaviors should be replaced using skipLinearAdMode and endLinearAdMode in the ad plugin.
adplaying (EVENT) -- In the future, this event is no longer guaranteed to happen once per ad break. Your ad plugin should trigger a ads-pod-started event to indicate the beginning of an ad break. The ads-ad-started event can be used to indicate the start of an individual ad in an ad break. There should be multiple ads-ad-started events corresponding to each ad in the ad break.
isAdPlaying() (METHOD) -- Does the same thing as inAdBreak but has a misleading name. Being in an ad break doesn't strictly mean that an ad is playing.
contentended (EVENT) -- This used to be the event that was used to indicate that content had ended and that it was time to play postrolls. The name was confusing because the content prefix is usually used during content restoration after an ad. Integrations should use readyforpostroll instead. In the future, the meaning of contentended will be updated to match what is expected by the prefix.

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