Dynamic Ad Insertion Linear API

The Dynamic Ad Insertion API enables you to request and track DAI linear (LIVE) streams.

Service: dai.google.com

All URIs below are relative to https://dai.google.com

Method: stream

HTTP request

POST https://dai.google.com/linear/v1/hls/event/{assetKey}/stream

Request header

Authorization: DCLKDAI key="<api-key>"

Path parameters

Request body

The request body is of type application/x-www-form-urlencoded and contains the following parameters:

Response body

If successful, the response body contains a new Stream. For server-side-beaconing streams, this Stream contains only the stream_id and stream_manifest fields.

Open Measurement

The DAI API contains information for Open Measurement verification in the Verifications field. This field contains one or more Verification elements that list the resources and metadata required to execute third-party measurement code in order to verify creative playback. Only JavaScriptResource is supported. For more information, please see the IAB Tech Lab and the VAST 4.1 spec.

Method: media verification

After encountering an ad media identifier during playback, immediately make a request using the media_verification_url obtained from the stream endpoint, above. These requests aren't necessary for server-side-beaconing streams, where the server initiates media verification.

Requests to the media verification endpoint are idempotent.

HTTP request

GET https://{media-verification-url}/{ad-media-id}

Response body

media verification returns the following responses:

• HTTP/1.1 204 No Content if media verification succeeds and all pings are sent.
• HTTP/1.1 404 Not Found if the request can't verify the media due to incorrect URL formatting or expiration.
• HTTP/1.1 404 Not Found if a previous verification request for this ID succeeded.
• HTTP/1.1 409 Conflict if another request is already sending pings at this time.

Ad media IDs (HLS)

Ad media identifiers will be encoded in HLS Timed Metadata using the key TXXX, reserved for "user-defined text information" frames. The contents of the frame will be unencrypted and will always begin with the text "google_".

The entire text contents of the frame should be appended to the ad verification URL prior to making each ad verification request.

Method: metadata

The metadata endpoint at metadata_url returns information used to build an ad UI. The metadata endpoint isn’t available for server-side-beaconing streams, where the server is responsible for initiating ad media verification.

HTTP request

GET https://{metadata_url}/{ad-media-id}

GET https://{metadata_url}

Response body

If successful, the response returns an instance of PodMetadata.

Working with Metadata

Metadata has three discrete sections: tags, ads, and ad breaks. The entry point into the data is the tags section. From there, iterate through the tags and find the first entry whose name is a prefix for the ad media ID found in the video stream. For example, you might have an ad media ID that looks like:

google_1234567890

Then you find a tag object named google_12345. In this case, it matches your ad media id. Once you find the correct ad media prefix object, you can look up ad ids, ad break ids, and the event type. Ad ids are then used to index the ads objects and ad break ids are used to index the breaks objects.

Response data

Stream

{
  "stream_id": string,
  "stream_manifest": string,
  "hls_master_playlist": string,
  "media_verification_url": string,
  "metadata_url": string,
  "session_update_url": string,
  "polling_frequency": number,
}

PodMetadata

{
  "tags": map[string, object(TagSegment)],
  "ads": map[string, object(Ad)],
  "ad_breaks": map[string, object(AdBreak)],
}

TagSegment

{
  "ad": string,
  "ad_break_id": string,
  "type": string,
}

AdBreak

{
  "type": string,
  "duration": number,
  "expected_duration": number,
  "ads": number,
}

Ad

{
  "ad_break_id": string,
  "position": number,
  "duration": number,
  "title": string,
  "description": string,
  "advertiser": string,
  "ad_system": string,
  "ad_id": string,
  "creative_id": string,
  "creative_ad_id": string,
  "deal_id": string,
  "clickthrough_url": string,
  "click_tracking_urls": [],
  "verifications": [object(Verification)],
  "slate": boolean,
  "icons": [object(Icon)],
  "wrappers": [object(Wrapper)],
  "universal_ad_id": object(UniversalAdID),
  "extensions": [],
  "companions": [object(Companion)],
  "interactive_file": object(InteractiveFile),
}

Icon

{
  "click_data": object(ClickData),
  "creative_type": string,
  "click_fallback_images": [object(FallbackImage)],
  "height": int32,
  "width": int32,
  "resource": string,
  "type": string,
  "x_position": string,
  "y_position": string,
  "program": string,
  "alt_text": string,
}

ClickData

{
  "url": string,
}

FallbackImage

{
  "creative_type": string,
  "height": int32,
  "width": int32,
  "resource": string,
  "alt_text": string,
}

Wrapper

{
  "system": string,
  "ad_id": string,
  "creative_id": string,
  "creative_ad_id": string,
  "deal_id": string,
}

Verification

{
  "vendor": string,
  "java_script_resources": [object(JavaScriptResource)],
  "tracking_events": [object(TrackingEvent)],
  "parameters": string,
}

JavaScriptResource

{
  "script_url": string,
  "api_framework": string,
  "browser_optional": boolean,
}

TrackingEvent

{
  "event": string,
  "uri": string,
}

UniversalAdID

{
  "id_value": string,
  "id_registry": string,
}

Companion

{
  "click_data": object(ClickData),
  "creative_type": string,
  "height": int32,
  "width": int32,
  "resource": string,
  "type": string,
  "ad_slot_id": string,
  "api_framework": string,
  "tracking_events": [object(TrackingEvent)],
}

InteractiveFile

{
  "resource": string,
  "type": string,
  "variable_duration": boolean,
  "ad_parameters": string,
}