ID3標籤

ID3標籤提供音訊或視訊檔案的相關資訊，例如檔案標題或藝人姓名。 瀏覽器TVSDK會在HLS資料流的傳輸資料流(TS)區段層級偵測ID3標籤，並傳送事件。 應用程式可從標籤中擷取資料。

在基本HLS資料流中找到新的ID3中繼資料時，瀏覽器TVSDK會觸發 AdobePSDK.TimedMetadataEvent 事件。

此 TimedMetadata ID3的物件具有下列屬性：

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儲存在中的各種ID3標籤 TimedMetadata 應用程式可透過下列兩種方式擷取：

• 在AdobePSDK.PSDKEventType.TIMED_METADATA_AVAILABLE事件監聽器中。

  var isSafari = function () {
      var nAgt = navigator.userAgent;
      var appName = navigator.appName;
      if ((nAgt.indexOf('MSIE') === -1) && //is not MS IE
          (appName !== 'Netscape' || nAgt.indexOf('Trident/') === -1) && //is not MS IE11
          (appName !== 'Netscape' || nAgt.indexOf('Edge') === -1) && // is not edge
          (nAgt.indexOf('Chrome') === -1) && // is not chrome
          (nAgt.indexOf('Safari') !== -1) //is Safari
      ){
          return true;
      }
      return false;
  };
  var hex2a = function (hex, offset, max) {
      var str = '';
      if (!hex)
          return str;
      for (var i = offset; i < hex.length && i < offset + max; i++)
          str += String.fromCharCode(hex[i]);
      return str;
  };
  var mediaPlayer = new AdobePSDK.MediaPlayer();
  mediaPlayer.addEventListener( AdobePSDK.PSDKEventType.TIMED_METADATA_AVAILABLE ,function(event){
      var td = event.timedMetadata;
      if(td.type == AdobePSDK.TimedMetadataType.ID3){
          var md = td.metadata;
          var keySet = md.keySet;
          var onSafari = isSafari();
          if(keySet && keySet.length){
              var msg = '';
              for(var j = 0; j < keySet.length; j++){
                  var idTag = keySet[j];
                  msg += idTag;
                  if(idTag.indexOf("T") == 0){
                      /* text frame*/
                      if(onSafari){
                          /* text frame data is exposed in object format
                           * where corresponding text data is exposed through
                           * data key of text frame data object
                           * */
                          var frameDataObject = md.getObject(idTag);
                          msg += " : " + frameDataObject.data;
                      } else {
                          var buff = md.getByteArray(idTag);
                          msg += " : " + hex2a(buff, 0, buff.length - 1);
                      }
                  }
                  msg += " ; ";
              }
          }
      }
  });
  

• 使用 MediaPlayerItem的 timedMetadata 屬性。

  var isSafari = function () {
      var nAgt = navigator.userAgent;
      var appName = navigator.appName;
      if ((nAgt.indexOf('MSIE') === -1) && //is not MS IE
          (appName !== 'Netscape' || nAgt.indexOf('Trident/') === -1) && //is not MS IE11
          (appName !== 'Netscape' || nAgt.indexOf('Edge') === -1) && // is not edge
          (nAgt.indexOf('Chrome') === -1) && // is not chrome
          (nAgt.indexOf('Safari') !== -1) //is Safari
      ){
          return true;
      }
      return false;
  };
  var hex2a = function (hex, offset, max) {
      var str = '';
      if (!hex)
          return str;
      for (var i = offset; i < hex.length && i < offset + max; i++)
          str += String.fromCharCode(hex[i]);
      return str;
  };
  var timedMetadataList = player.currentItem.timedMetadata;
  for(var i = 0; i < timedMetadataList.length; i++){
      var td = timedMetadataList[i];
      if(td.type == AdobePSDK.TimedMetadataType.ID3){
          var md = td.metadata;
          var keySet = md.keySet;
          var onSafari = isSafari();
          if(keySet && keySet.length){
              var msg = '';
              for(var j = 0; j < keySet.length; j++){
                  var idTag = keySet[j];
                  msg += idTag;
                  if(idTag.indexOf("T") == 0){
                      /* text frame*/
                      if(onSafari){
                          /* text frame data is exposed in object format
                           * where corresponding text data is exposed through
                           * data key of text frame data object
                           * */
                          var frameDataObject = md.getObject(idTag);
                          msg += " : " + frameDataObject.data;
                      } else {
                          var buff = md.getByteArray(idTag);
                          msg += " : " + hex2a(buff, 0, buff.length - 1);
                      }
                  }
                  msg += " ; ";
              }
          }
      }
  }