本頁面由 Cloud Translation API 翻譯而成。

開始使用 IMA DAI SDK

IMA SDK 可讓您輕鬆將多媒體廣告整合至您的網站和應用程式。IMA SDK 可以向任何與 VAST 相容的廣告伺服器，並管理您應用程式中的廣告播放方式。使用 IMA DAI SDK 時，應用程式可提供廣告和內容影片的串流請求 (VOD 或直播內容)。接著，SDK 會傳回讓您省去切換廣告和內容影片的麻煩應用程式內的一切

選取所需的 DAI 解決方案

完整服務 DAI

本指南說明如何將 IMA DAI SDK 整合到簡易影片播放器中應用程式。如果您要檢視或繼續完成樣本整合，請下載範例。

IMA DAI 總覽

導入 IMA DAI 時，必須執行兩個主要的 SDK 元件，如這個指南：

StreamRequest: 定義串流要求的物件。串流要求可以是隨選影片或直播串流。要求會指明內容 ID 以及 API 金鑰或驗證權杖等參數。
StreamManager: 這個物件會處理動態廣告插播串流，以及與 DAI 後端的互動。串流管理員也會處理追蹤連線偵測 (ping)，並將串流和廣告事件轉送至內容。

必要條件

請詳閱相容性頁面，確認系統支援您預期的用途。
下載 Roku 範例播放器程式碼
將範例播放器程式碼部署至 Roku 裝置，驗證開發測試設定有效

播放影片

提供的影片播放器範例會隨即播放內容影片。部署複製到 Roku 播放器的範例播放器確保設定正確

將您的影片播放器轉換成 IMA DAI 串流播放器

請按照下列步驟實作串流播放器。

建立 Sdk.xml

在專案中新增名為 Sdk.xml 的 MainScene.xml 檔案，然後新增以下樣板：

Sdk.xml

<?xml version = "1.0" encoding = "utf-8" ?>

<component name = "imasdk" extends = "Task">
<interface>
</interface>
<script type = "text/brightscript">
<![CDATA[
  ' Your code goes here.
]]>
</script>
</component>

您必須在本指南中分別編輯這兩個檔案。

載入 Roku 廣告架構

IMA DAI SDK 取決於 Roku 廣告架構。如要載入架構將下列程式碼新增至 manifest 和 Sdk.xml：

資訊清單

bs_libs_required=roku_ads_lib,googleima3

Sdk.xml

Library "Roku_Ads.brs"
Library "IMA3.brs"

載入 IMA DAI SDK

載入 IMA 動態廣告插播串流的第一步，就是載入初始化 IMA DAI SDK。下列指令會載入 IMA DAI SDK 指令碼。

Sdk.xml

<interface>
  <field id="sdkLoaded" type="Boolean" />
  <field id="errors" type="stringarray" />
</interface>
...
Sub init()
  m.top.functionName = "runThread"
End Sub

Sub runThread()
  if not m.top.sdkLoaded
    loadSdk()
  End If
End Sub

Sub loadSdk()
    If m.sdk = invalid
      m.sdk = New_IMASDK()
    End If
    m.top.sdkLoaded = true
End Sub

現在請在 MainScene.xml 中啟動這項工作，並移除呼叫來載入內容串流。

MainScene.xml

function init()
  m.video = m.top.findNode("myVideo")
  m.video.notificationinterval = 1
  loadImaSdk()
end function

function loadImaSdk() as void
  m.sdkTask = createObject("roSGNode", "imasdk")
  m.sdkTask.observeField("sdkLoaded", "onSdkLoaded")
  m.sdkTask.observeField("errors", "onSdkLoadedError")

  m.sdkTask.control = "RUN"
end function

Sub onSdkLoaded(message as Object)
  print "----- onSdkLoaded --- control ";message
End Sub

Sub onSdkLoadedError(message as Object)
  print "----- errors in the sdk loading process --- ";message
End Sub

建立 IMA 串流播放器

接下來，您必須使用現有的 roVideoScreen 建立 IMA 串流廣告。此串流播放器會實作三種回呼方法：loadUrl、 adBreakStarted和adBreakEnded。觀看串流時，也不要使用「幻覺」功能資料。這樣可以避免使用者在片頭廣告當下就略過廣告會開始另存新檔。

Sdk.xml

<interface>
  <field id="sdkLoaded" type="Boolean" />
  <field id="errors" type="stringarray" />
  <field id="urlData" type="assocarray" />
  <field id="adPlaying" type="Boolean" />
  <field id="video" type="Node" />
</interface>
...
Sub setupVideoPlayer()
  sdk = m.sdk
  m.player = sdk.createPlayer()
  m.player.top = m.top
  m.player.loadUrl = Function(urlData)
    m.top.video.enableTrickPlay = false
    m.top.urlData = urlData
  End Function
  m.player.adBreakStarted = Function(adBreakInfo as Object)
    print "---- Ad Break Started ---- "
    m.top.adPlaying = True
    m.top.video.enableTrickPlay = false
  End Function
  m.player.adBreakEnded = Function(adBreakInfo as Object)
    print "---- Ad Break Ended ---- "
    m.top.adPlaying = False
    m.top.video.enableTrickPlay = true
  End Function
End Sub

建立及執行串流要求

您現在有了串流播放器，就可以建立及執行串流要求。本例包含直播和隨選串流 (VOD) 串流的資料。使用隨選影片但你可以改用直播，只要將「selectedStream」從 m.testVodStream 到 m.testLiveStream。

如要支援 AdUI (例如 adChoices 圖示)，您也必須傳送在要求中附上含有您的內容影片的節點參照。

MainScene.xml

function init()
  m.video = m.top.findNode("myVideo")
  m.video.notificationinterval = 1
  m.testLiveStream = {
    title: "Livestream",
    assetKey: "sN_IYUG8STe1ZzhIIE_ksA",
    apiKey: "",
    type: "live"
  }
  m.testVodStream = {
    title: "VOD stream"
    contentSourceId: "2548831",
    videoId: "tears-of-steel",
    apiKey: "",
    type: "vod"
  }
  loadImaSdk()
end function

function loadImaSdk() as void
  m.sdkTask = createObject("roSGNode", "imasdk")
  m.sdkTask.observeField("sdkLoaded", "onSdkLoaded")
  m.sdkTask.observeField("errors", "onSdkLoadedError")

  selectedStream = m.testVodStream
  m.videoTitle = selectedStream.title
  m.sdkTask.streamData = selectedStream

  m.sdkTask.video = m.video
  m.sdkTask.control = "RUN"
end function

Sdk.xml

<interface>
  <field id="sdkLoaded" type="Boolean" />
  <field id="errors" type="stringarray" />
  <field id="urlData" type="assocarray" />
  <field id="adPlaying" type="Boolean" />
  <field id="video" type="Node" />
  <field id="streamData" type="assocarray" />
  <field id="streamManagerReady" type="Boolean" />
</interface>
...
Sub runThread()
  if not m.top.sdkLoaded
    loadSdk()
  End If
  if not m.top.streamManagerReady
    loadStream()
  End If
End Sub

Sub loadStream()
  sdk = m.sdk
  sdk.initSdk()
  setupVideoPlayer()

  request = {}
  streamData = m.top.streamData
  if streamData.type = "live"
    request = sdk.CreateLiveStreamRequest(streamData.assetKey, streamData.apiKey)
  else if streamData.type = "vod"
    request = sdk.CreateVodStreamRequest(streamData.contentSourceId, streamData.videoId, streamData.apiKey)
  else
    request = sdk.CreateStreamRequest()
  end if

  request.player = m.player
  request.videoObject = m.top.video
  ' Required to support UI elements for 'Why This Ad?' and skippability
  request.adUiNode = m.top.video

  requestResult = sdk.requestStream(request)
  If requestResult &lt;&gt; Invalid
    print "Error requesting stream ";requestResult
  Else
    m.streamManager = Invalid
    While m.streamManager = Invalid
      sleep(50)
      m.streamManager = sdk.getStreamManager()
    End While
    If m.streamManager = Invalid or m.streamManager["type"] &lt;&gt; Invalid or m.streamManager["type"] = "error"
      errors = CreateObject("roArray", 1, True)
      print "error ";m.streamManager["info"]
      errors.push(m.streamManager["info"])
      m.top.errors = errors
    Else
      m.top.streamManagerReady = True
      addCallbacks()
      m.streamManager.start()
    End If
  End If
End Sub

新增事件監聽器並開始串流

請求直播後，您還有幾個步驟要做：新增活動以便追蹤廣告進度、開始串流播放，以及將 Roku 訊息轉送給 SDK。

MainScene.xml

function loadImaSdk() as void
  m.sdkTask = createObject("roSGNode", "imasdk")
  m.sdkTask.observeField("sdkLoaded", "onSdkLoaded")
  m.sdkTask.observeField("errors", "onSdkLoadedError")

  selectedStream = m.testVodStream
  m.videoTitle = selectedStream.title
  m.sdkTask.streamData = selectedStream

  m.sdkTask.observeField("urlData", "urlLoadRequested")
  m.sdkTask.video = m.video
  m.sdkTask.control = "RUN"
end function

Sub urlLoadRequested(message as Object)
  print "Url Load Requested ";message
  data = message.getData()

  playStream(data.manifest)
End Sub

Sub playStream(url as Object)
  vidContent = createObject("RoSGNode", "ContentNode")
  vidContent.url = url
  vidContent.title = m.videoTitle
  vidContent.streamformat = "hls"
  m.video.content = vidContent
  m.video.setFocus(true)
  m.video.visible = true
  m.video.control = "play"
  m.video.EnableCookies()
End Sub

Sdk.xml

Sub runThread()
  if not m.top.sdkLoaded
    loadSdk()
  End If
  if not m.top.streamManagerReady
    loadStream()
  End If
  If m.top.streamManagerReady
    runLoop()
  End If
End Sub

Sub runLoop()
  m.top.video.timedMetaDataSelectionKeys = ["*"]

  m.port = CreateObject("roMessagePort")

  ' Listen to all fields.

  ' IMPORTANT: Failure to listen to the position and timedmetadata fields
  ' could result in ad impressions not being reported.
  fields = m.top.video.getFields()
  for each field in fields
    m.top.video.observeField(field, m.port)
  end for

  while True
    msg = wait(1000, m.port)
    if m.top.video = invalid
      print "exiting"
      exit while
    end if

    m.streamManager.onMessage(msg)
    currentTime = m.top.video.position
    If currentTime > 3 And not m.top.adPlaying
       m.top.video.enableTrickPlay = true
    End If
  end while
End Sub

Function addCallbacks() as Void
  m.streamManager.addEventListener(m.sdk.AdEvent.ERROR, errorCallback)
  m.streamManager.addEventListener(m.sdk.AdEvent.START, startCallback)
  m.streamManager.addEventListener(m.sdk.AdEvent.FIRST_QUARTILE, firstQuartileCallback)
  m.streamManager.addEventListener(m.sdk.AdEvent.MIDPOINT, midpointCallback)
  m.streamManager.addEventListener(m.sdk.AdEvent.THIRD_QUARTILE, thirdQuartileCallback)
  m.streamManager.addEventListener(m.sdk.AdEvent.COMPLETE, completeCallback)
End Function

Function startCallback(ad as Object) as Void
  print "Callback from SDK -- Start called - "
End Function

Function firstQuartileCallback(ad as Object) as Void
  print "Callback from SDK -- First quartile called - "
End Function

Function midpointCallback(ad as Object) as Void
  print "Callback from SDK -- Midpoint called - "
End Function

Function thirdQuartileCallback(ad as Object) as Void
  print "Callback from SDK -- Third quartile called - "
End Function

Function completeCallback(ad as Object) as Void
  print "Callback from SDK -- Complete called - "
End Function

Function errorCallback(error as Object) as Void
  print "Callback from SDK -- Error called - "; error
  m.errorState = True
End Function

新增可略過的廣告支援 (選用)

如果要支援可略過廣告，您必須在以下位置加入 seek 方法： IMA DAI SDK 的播放器物件，可透過程式輔助方式將影片跳轉至指定位置，浮點秒數

如要支援可略過的廣告，請務必一併將 adUiNode敬上。

Sdk.xml

  m.player.loadUrl = Function(urlData)
    m.top.video.enableTrickPlay = false
    m.top.urlData = urlData
  End Function

  m.player.seek = Function(timeSeconds as Float)
     print "---- SDK requested seek to ----" ; timeSeconds
     m.top.video.seekMode = "accurate"
     m.top.video.seek = timeSeconds
  End Function

  m.player.adBreakStarted = Function(adBreakInfo as Object)
    print "---- Ad Break Started ---- "
    m.top.adPlaying = True
    m.top.video.enableTrickPlay = false
  End Function