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Pod serving DAI
IMA SDKs simplify integrating multimedia ads into your websites and apps.
IMA SDKs can request ads from any VAST-compliant ad server and manage ad playback in your apps.
With IMA DAI SDKs, apps make a stream request for ad and content video for either VOD or live content. The SDK then returns a combined video stream, so that you don't have to manage switching between ad and content video within your app.
This guide demonstrates how to play a DAI Pod Serving stream, using the IMA DAI SDK for CAF.
Before using this guide, familiarize yourself with the Chromecast Application Framework's Web Receiver protocol. This guide assumes a basic understanding of CAF receiver concepts, such as message interceptors and mediaInformation objects, and familiarity with using the Cast Command and Control tool, to emulate a CAF sender.
To use IMA DAI pod serving, you must be working with a pod serving partner and must have an Ad Manager 360 Advanced account. If you have an Ad Manager account, contact your account manager for more details. For information about signing up for Ad Manager, visit the Ad Manager Help Center.
For information on integrating with other platforms, or on using the IMA client-side SDKs, see Interactive Media Ads SDKs.
IMA DAI Pod Serving overview
Implementing pod serving using the IMA CAF DAI SDK involves two main components, which are demonstrated in this guide:
StreamRequest
: An object that defines a stream request to Google's advertising servers. Requests specify a Network Code, Custom Asset Key, and an optional API key, as well as other optional parameters.StreamManager
: An object that handles communication between the video stream and the IMA DAI SDK, such as firing tracking pings and forwarding stream events to the publisher.
Prerequisites
- A Cast Developer Console account with registered test devices.
- A hosted web receiver app that is registered with your Cast Developer Console and which can be modified to host the code provided by this guide.
- A sending app that is configured to use your web receiver app. For the purposes of this example, use the Cast Command and Control tool as your sender.
Configure the sender's MediaInfo objects
First, configure your sender app's
MediaInfo
object
to include the following fields:
Field | Contents | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
contentId
|
A unique identifier for this media item.
CONTENT_ID |
||||||||||
contentUrl
|
Optional. Backup stream URL to play if the DAI stream fails to load.
BACKUP_STREAM_URL |
||||||||||
contentType
|
Optional. Mimetype of the content backup streams. Only needed for DASH
streams.
CONTENT_STREAM_MIMETYPE |
||||||||||
streamType
|
The string literal or constant used for this value varies by sender platform. | ||||||||||
customData
|
The customData field contains a key-value store of additional
required fields. In this sample, it contains your DAI stream parameters. In
a production app you might instead pass an identifier that your cast
receiver app would use to retrieve these parameters with a server-side
request.
|
Here are some code samples to help you get started:
Web
To configure these values in a Cast web sender, first create a
MediaInfo
object with the required data, then make a load
request to the web receiver.
// Create mediaInfo object
const mediaInfo = new chrome.cast.media.MediaInfo("CONTENT_ID");
mediaInfo.contentUrl = "BACKUP_STREAM_URL";
mediaInfo.contentType = "CONTENT_STREAM_MIMETYPE";
mediaInfo.streamType = chrome.cast.media.StreamType.LIVE;
mediaInfo.customData = {
daiStreamType: "DAI_STREAM_TYPE",
networkCode: "NETWORK-CODE",
customAssetKey: "CUSTOM_ASSET_KEY",
apiKey: "API_KEY"
};
// Make load request to cast web receiver
const castSession = cast.framework.CastContext.getInstance().getCurrentSession();
const request = new chrome.cast.media.LoadRequest(mediaInfo);
castSession.loadMedia(request).then(
() => { console.log('Load succeed'); },
(errorCode) => { console.log('Error code: ' + errorCode); });
Android
To configure these values in a Cast web sender, first create a MediaInfo object with the required data, then make a load request to the web receiver.
JSONObject customData = new JSONObject()?
.put("daiStreamType", "DAI_STREAM_TYPE")
.put("networkCode", "NETWORK-CODE")
.put("customAssetKey", "CUSTOM_ASSET_KEY")
.put("apiKey", "API_KEY");
MediaInfo mediaInfo = MediaInfo.Builder("CONTENT_ID")
.setContentUrl("BACKUP_STREAM_URL")
.setContentType("CONTENT_STREAM_MIMETYPE")
.setStreamType(MediaInfo.STREAM_TYPE_LIVE)
.setCustomData(customData)
.build();
RemoteMediaClient remoteMediaClient = mCastSession.getRemoteMediaClient();
remoteMediaClient.load(new MediaLoadRequestData.Builder().setMediaInfo(mediaInfo).build());
iOS (Obj-C)
To configure these values in a Cast web sender, first create a
GCKMediaInformation
object with the required data, then make a load
request to the web receiver.
NSURL url = [NSURL URLWithString:@"BACKUP_STREAM_URL"];
NSDictionary *customData = @{
@"daiStreamType": @"DAI_STREAM_TYPE",
@"networkCode": @"NETWORK-CODE",
@"customAssetKey": @"CUSTOM_ASSET_KEY",
@"apiKey": @"API_KEY"};
mediaInfoBuilder.customData = customData;
GCKMediaInformationBuilder *mediaInfoBuilder =
[[GCKMediaInformationBuilder alloc] initWithContentID: @"CONTENT_ID"];
mediaInfoBuilder.contentURL = url;
mediaInfoBuilder.contentType = @"CONTENT_STREAM_MIMETYPE";
mediaInfoBuilder.streamType = GCKMediaStreamTypeLive;
mediaInfoBuilder.customData = customData;
self.mediaInformation = [mediaInfoBuilder build];
GCKRequest *request = [self.sessionManager.currentSession.remoteMediaClient loadMedia:self.mediaInformation];
if (request != nil) {
request.delegate = self;
}
iOS (Swift)
To configure these values in a Cast web sender, first create a
GCKMediaInformation
object with the required data, then make a load
request to the web receiver.
let url = URL.init(string: "BACKUP_STREAM_URL")
guard let mediaURL = url else {
print("invalid mediaURL")
return
}
let customData = [
"daiStreamType": "DAI_STREAM_TYPE",
"networkCode": "NETWORK-CODE",
"customAssetKey": "CUSTOM_ASSET_KEY",
"region": "API_KEY"
]
let mediaInfoBuilder = GCKMediaInformationBuilder.init(contentId: "CONTENT_ID")
mediaInfoBuilder.contentURL = mediaUrl
mediaInfoBuilder.contentType = @"CONTENT_STREAM_MIMETYPE"
mediaInfoBuilder.streamType = GCKMediaStreamType.Live
mediaInfoBuilder.customData = customData
mediaInformation = mediaInfoBuilder.build()
guard let mediaInfo = mediaInformation else {
print("invalid mediaInformation")
return
}
if let request = sessionManager.currentSession?.remoteMediaClient?.loadMedia
(mediaInfo) {
request.delegate = self
}
CAC tool
To configure these values in the Cast Command and Control tool, click the Load Media tab, and set the custom load request type to LOAD. Then replace the JSON data in the text area with this JSON:
{
"media": {
"contentId": "CONTENT_ID",
"contentUrl": "BACKUP_STREAM_URL",
"contentType": ""CONTENT_STREAM_MIMETYPE"",
"streamType": "LIVE",
"customData": {
"daiStreamType": "DAI_STREAM_TYPE",
"networkCode": "NETWORK-CODE",
"customAssetKey": "CUSTOM_ASSET_KEY",
"oAuthToken": "API_KEY"
}
}
}
This custom load request can be sent to the receiver to test the rest of the steps.
Create a basic CAF receiver
Create a custom web receiver, as seen in the CAF SDK Custom Web Receiver Guide.
Your receiver's code should look like this:
<html>
<head>
<script
src="//www.gstatic.com/cast/sdk/libs/caf_receiver/v3/cast_receiver_framework.js">
</script>
</head>
<body>
<cast-media-player></cast-media-player>
<script>
// ...
</script>
</body>
</html>
Import the IMA DAI SDK and get the Player Manager
Add a script tag to import the IMA DAI SDK for CAF to your web receiver, just after the script loading CAF. In the script tag, store the receiver context and player manager as constants before starting the receiver.
<html>
<head>
<script
src="//www.gstatic.com/cast/sdk/libs/caf_receiver/v3/cast_receiver_framework.js"></script>
<script src="//imasdk.googleapis.com/js/sdkloader/cast_dai.js"></script>
</head>
<body>
<cast-media-player></cast-media-player>
<script>
const castContext = cast.framework.CastReceiverContext.getInstance();
const playerManager = castContext.getPlayerManager();
castContext.start();
</script>
</body>
</html>
Initialize the IMA Stream Manager
Initialize the IMA Stream Manager.
<html>
<head>
<script type="text/javascript"
src="//www.gstatic.com/cast/sdk/libs/caf_receiver/v3/cast_receiver_framework.js"></script>
<script src="//imasdk.googleapis.com/js/sdkloader/cast_dai.js"></script>
</head>
<body>
<cast-media-player></cast-media-player>
<script>
const castContext = cast.framework.CastReceiverContext.getInstance();
const playerManager = castContext.getPlayerManager();
const streamManager = new google.ima.cast.dai.api.StreamManager();
castContext.start();
</script>
</body>
</html>
Create the Stream Manager Load Interceptor
Before your media items are passed to CAF, create your stream request in a LOAD message interceptor.
const castContext = cast.framework.CastReceiverContext.getInstance();
const playerManager = castContext.getPlayerManager();
const streamManager = new google.ima.cast.dai.api.StreamManager();
/**
* Creates a livestream request object for a pod serving stream.
* @param {!LoadRequestData} castRequest The request object from the cast sender
* @return {StreamRequest} an IMA stream request
*/
const createStreamRequest = (castRequest) => { /* ... */};
/**
* Initates a DAI stream request for the final stream manifest.
* @param {!LoadRequestData} castRequest The request object from the cast sender
* @return {Promise<LoadRequestData>} a promise that resolves to an updated castRequest, containing the DAI stream manifest
*/
const createDAICastRequest = (castRequest) => {
return streamManager.requestStream(castRequest, createStreamRequest(castRequest))
.then((castRequestWithPodStreamData) => {
console.log('Successfully made DAI stream request.');
// ...
return castRequestWithPodStreamData;
})
.catch((error) => {
console.log('Failed to make DAI stream request.');
// CAF will automatically fallback to the content URL
// that it can read from the castRequest object.
return castRequest;
});
};
playerManager.setMessageInterceptor(
cast.framework.messages.MessageType.LOAD, createDAICastRequest);
castContext.start();
Create the stream request
Complete the createStreamRequest
function to create a pod serving stream based
on the CAF load request.
/**
* Creates a livestream request object for a pod serving stream.
* @param {!LoadRequestData} castRequest The request object from the cast sender
* @return {StreamRequest} an IMA stream request
*/
const createStreamRequest = (castRequest) => {
const customData = castRequest.media.customData;
let streamRequest;
if (customData.daiStreamType == "LIVE") {
streamRequest = new google.ima.cast.dai.api.PodStreamRequest();
streamRequest.customAssetKey = customData.customAssetKey;
streamRequest.networkCode = customData.networkCode;
streamRequest.apiKey = customData.apiKey;
} else if (customData.daiStreamType == "VOD") {
streamRequest = new google.ima.cast.dai.api.PodVodStreamRequest();
streamRequest.networkCode = customData.networkCode;
streamRequest.apiKey = customData.apiKey;
}
return streamRequest;
};
Retrieve the stitched manifest from your VTP
If your stream request is successful, use streamManager.getStreamId()
to
retrieve the stream's ID. Your Video Technical Partner (VTP) or custom manifest
manipulator will provide instructions to retrieve a manifest URL, using this
stream ID.
Once you have retrieved your manifest URL, replace the existing contentUrl
with the new manifestUrl
.
Lastly, before returning the modified stream manifest, call the
loadStreamMetadata
method on your
streamManager
to inform the IMA SDK that it can safely request stream metadata. This call is
only necessary for VOD streams.
/**
* Initates a DAI stream request for the final stream manifest.
* @param {!LoadRequestData} castRequest The request object from the cast sender
* @return {Promise<LoadRequestData>} a promise that resolves to an updated castRequest, containing the DAI stream manifest
*/
const createDAICastRequest = (castRequest) => {
return streamManager.requestStream(castRequest, createStreamRequest(castRequest))
.then((castRequestWithPodStreamData) => {
console.log('Successfully made DAI stream request.');
// This is a sample VTP integration. Consult your VTP documentation
// for how to retrieve an ad-stitched stream manifest URL.
const manifestTemplate = "https://.../manifest.m3u8?gam_stream_id=[[STREAMID]]";
const streamId = streamManager.getStreamId();
const manifestUrl = manifestTemplate.replace('[[STREAMID]]', streamId)
// Assign your manifestUrl to the request's content URL.
castRequestWithPodStreamData.media.contentUrl = manifestUrl;
// After generating the manifest URL, VOD streams must notify the
// IMA SDK that it is safe to request ad pod metadata.
// This is only necessary for VOD streams. It is a no-op for
// livestreams, so no conditional is needed.
streamManager.loadStreamMetadata();
return castRequestWithPodStreamData;
})
.catch((error) => {
console.log('Failed to make DAI stream request.');
// CAF will automatically fallback to the content URL
// that it can read from the castRequest object.
return castRequest;
});
};
You can now request and play back pod serving streams with the Cast Application Framework and the IMA DAI SDK for CAF.