開始使用 IMA DAI SDK

選取所需的 DAI 解決方案

廣告連播放送 DAI

IMA SDK 可簡化將多媒體廣告整合至網站和應用程式的流程。

IMA SDK 可以從任何 符合 VAST 規定 管理廣告播放事宜。

使用 IMA DAI SDK 時，應用程式會向 隨選影片或直播內容接著，SDK 會傳回合併的影片串流 您不需要費心在廣告與內容影片之間切換 應用程式。

本指南示範如何使用 IMA 播放即時 DAI 廣告連播放送串流 適用於 CAF 的 DAI SDK。

使用本指南前，請先熟悉 Chromecast 應用程式架構網路接收器 因此效能相當卓越本指南假設您對 CAF 接收器概念有基本的瞭解， 例如 訊息攔截器 和 mediaInformation 也熟悉 投放命令與控制工具 模擬 CAF 傳送端。

如要使用 IMA DAI 廣告連播放送功能，您必須與廣告連播放送合作夥伴及 必須擁有 Ad Manager 360 進階知識 讓他們使用服務帳戶如果您有 Ad Manager 帳戶，請與客戶經理聯絡 瞭解詳情若要瞭解如何申請 Ad Manager，請前往 Ad Manager 說明中心。

瞭解如何與其他平台整合，或進一步瞭解如何使用 IMA 用戶端 SDK，請參閱「互動式媒體廣告 SDK」一文。

IMA DAI 廣告連播放送總覽

使用 IMA CAF DAI SDK 導入廣告連播放送時，必須涵蓋兩個主要元件： 相關數據

• StreamRequest: 這個物件可定義傳送至 Google 廣告伺服器的串流要求。 要求會指定網路代碼、自訂資產金鑰和選用的 API 金鑰。 以及其他選用參數
• StreamManager: 處理影片串流與 IMA DAI 之間的通訊的物件 SDK，例如觸發追蹤連線偵測 (ping)，以及將串流事件轉送至 內容。

必要條件

• Cast 開發人員控制台帳戶： 。
• 代管型網路接收器 應用程式 已註冊至 Cast 開發人員控制台，而您可以修改主機 使用本指南提供的程式碼
• 設為使用網路接收器應用程式的傳送應用程式。對於 在本範例中，請使用 Cast 指令與控制 工具做為寄件者。

設定傳送者的 MediaInfo 物件

請先設定傳送者應用程式的 MediaInfo 物件 納入下列欄位：

下列程式碼範例可協助您快速上手：

// 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 = {
manifestUrl: "MANIFEST_URL",
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); });

JSONObject customData = new JSONObject()?
  .put("manifestUrl", "MANIFEST_URL")
  .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());

NSURL url = [NSURL URLWithString:@"BACKUP_STREAM_URL"];
NSDictionary *customData = @{
  @"manifestUrl": @"MANIFEST_URL",
  @"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;
}

let url = URL.init(string: "BACKUP_STREAM_URL")
guard let mediaURL = url else {
  print("invalid mediaURL")
  return
}

let customData = [
  "liveConfigID": "MANIFEST_URL",
  "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
}

{
  "media": {
    "contentId": "CONTENT_ID",
    "contentUrl": "BACKUP_STREAM_URL",
    "contentType": ""CONTENT_STREAM_MIMETYPE"",
    "streamType": "LIVE",
    "customData": {
      "liveConfigID": "MANIFEST_URL",
      "networkCode": "NETWORK-CODE",
      "customAssetKey": "CUSTOM_ASSET_KEY",
      "oAuthToken": "API_KEY"
    }
  }
}

這個自訂載入要求可以傳送給接收器，測試其餘的 100 萬步的訓練

建立基本 CAF 接收器

建立自訂網路接收器，如 CAF SDK 自訂網路接收器所示 指南。

接收端的程式碼應如下所示：

<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>

匯入 IMA DAI SDK 並取得播放器管理工具

請新增指令碼代碼，將 CAF 適用的 IMA DAI SDK 匯入您的網路接收器。 ，在指令碼標記中，儲存接收器結構定義。 做為常數，然後再啟動接收器。

<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>

初始化 IMA Stream Manager

初始化 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>

建立串流管理員載入攔截器

將媒體項目傳送至 CAF 之前，請先在 LOAD 訊息 攔截器。

    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();

建立串流要求

完成 createStreamRequest 函式，建立以 Pod 放送串流為基礎的 CAF 載入請求來處理。

    /**
     * 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 streamRequest = new google.ima.cast.dai.api.PodStreamRequest();
      const customData = castRequest.media.customData;

      streamRequest.customAssetKey = customData.customAssetKey;
      streamRequest.networkCode = customData.networkCode;
      streamRequest.apiKey = customData.apiKey;

      return streamRequest;
    };

將內容網址替換成資訊清單網址和串流 ID

如果串流要求成功，請使用 streamManager.getStreamId() 來 擷取串流的 ID 並插入您的 manifestUrl 中 [[STREAMID]]。然後將現有的 contentUrl 替換為新的 manifestUrl，讓 CAF 搭配拼接的廣告連播播放直播。

    /**
     * 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.');
            const media = castRequestWithPodStreamData.media;
                const manifestUrl = media.customData.manifestUrl || "";
                if (manifestUrl) {
                    console.log('Replacing the contentURL with the manifest URL and stream ID');
                    const streamId = streamManager.getStreamId();
                    castRequestWithPodStreamData.media.contentUrl = manifestUrl.replace('[[STREAMID]]', streamId);

            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;
          });
    };

您現在可以透過 Cast 應用程式，要求及播放備用 Pod 來放送串流內容 CAF 適用的架構和 IMA DAI SDK。