Visualizza la durata, l'ora corrente e il tempo rimanente del video

È possibile utilizzare il browser TVSDK per recuperare informazioni sul supporto che è possibile visualizzare sulla barra di ricerca.

1. Attendere che il lettore sia almeno nello stato PREPARATO.

2. Recupera il tempo corrente della testina di riproduzione utilizzando MediaPlayer.currentTime attributo.

   Questo attributo restituisce la posizione corrente dell’indicatore di riproduzione sulla timeline virtuale in millisecondi. Il tempo viene calcolato rispetto al flusso risolto che potrebbe contenere più istanze di contenuto alternativo, ad esempio più annunci o interruzioni pubblicitarie unite nel flusso principale. Per i flussi live/lineari, il tempo restituito è sempre nell’intervallo della finestra di riproduzione.

   MediaPlayer.currentTime
   

3. Recupera l’intervallo di riproduzione del flusso e determina la durata.

   1. Utilizza il mediaPlayer.playbackRange per ottenere l'intervallo di tempo della timeline virtuale.

   2. Per determinare la durata, sottrarre l'inizio dalla fine dell'intervallo.

      Ciò include la durata del contenuto aggiuntivo inserito nel flusso (annunci).

      Per VOD, l’intervallo inizia sempre con zero e il valore finale è uguale alla somma della durata del contenuto principale e delle durate del contenuto aggiuntivo inserito nel flusso (annunci).

      Per una risorsa lineare/live, l’intervallo rappresenta l’intervallo della finestra di riproduzione e questo intervallo cambia durante la riproduzione.

4. Utilizza i metodi disponibili sugli elementi MediaPlayer e Browser TVSDK per impostare i parametri della barra di ricerca.

   Ad esempio, qui è presente un layout possibile per visualizzare la barra di ricerca in HTML.

   <div class="seekbar" id="seekbar">
        <div>
           <span class="backer" id="backer"></span>
           <span class="buffer" id="buffer" ></span>
           <div class="playhead" id="playhead"></div>
                     <span class="progress" id="progress" ></span>
           </div>
         </div>
     </div>
   

   Di seguito è riportato il css corrispondente:

   #seekbar {
         position: relative;
         width: 100%;
         height: 16px;
         cursor: pointer;
         background: transparent;
   }
   
   #seekbar div {
         position: relative;
         height: 100%;
         margin-left: 8px;
         margin-right: 8px;
   }
   
   #seekbar span {
         position: absolute;
         height: 60%;
         top: 20%;
   
         display: block;
   
         -webkit-border-radius: 16px;
         -moz-border-radius: 16px;
         border-radius: 16px;
   }
   
   #seekbar.playhead {
        z-index: 1011;
        height: 14px;
        width: 14px;
        border: 1px outset #c9cbce;
        position: absolute;
        left: -8px; /* adjust center of playhead over start of range */
        display: block;
        padding: 0;
        margin: 0;
   
        background: #c9cbce; /* Old browsers */
        background: -moz-radial-gradient(circle, #4591ce 0%, #3080c2 40%, #c9cbce 45%, #dedee1 100%); /* FF3.6+ */
        background: -webkit-radial-gradient(circle, #4591ce 0%, #3080c2 40%, #c9cbce 45%, #dedee1 100%); /* Chrome10+,Safari5.1+ */
        background: -o-radial-gradient(circle, #4591ce 0%, #3080c2 40%, #c9cbce 45%, #dedee1 100%); /* Opera 11.10+ */
        background: -ms-radial-gradient(circle, #4591ce 0%, #3080c2 40%, #c9cbce 45%, #dedee1 100%); /* IE10+ */
        background: radial-gradient(circle, #4591ce 0%, #3080c2 40%, #c9cbce 45%, #dedee1 100%); /* W3C */
        filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#c9cbce', endColorstr='#dedee1',GradientType=0 ); /* IE6-9 */
   
        -webkit-border-radius: 16px;
        -moz-border-radius: 16px;
        border-radius: 16px;
   }
   
   #seekbar.backer {
           z-index: 1004;
           width: 100%;
   
           background: #414142; /* Old browsers */
           background: -moz-linear-gradient(top,  #414142 0%, #343232 100%); /* FF3.6+ */
           background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#414142), color-stop(100%,#343232)); /* Chrome,Safari4+ */
           background: -webkit-linear-gradient(top,  #414142 0%,#343232 100%); /* Chrome10+,Safari5.1+ */
           background: -o-linear-gradient(top,  #414142 0%,#343232 100%); /* Opera 11.10+ */
           background: -ms-linear-gradient(top,  #414142 0%,#343232 100%); /* IE10+ */
           background: linear-gradient(to bottom,  #414142 0%,#343232 100%); /* W3C */
           filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#414142', endColorstr='#343232',GradientType=0 ); /* IE6-9 */
   
   }
   
   #seekbar .buffer {
          z-index: 1005;
          position: absolute;
   
          background: #4b4b4c; /* Old browsers */
          background: -moz-linear-gradient(top,  #4b4b4c 0%, #818184 100%); /* FF3.6+ */
          background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#4b4b4c), color-stop(100%,#818184)); /* Chrome,Safari4+ */
          background: -webkit-linear-gradient(top,  #4b4b4c 0%,#818184 100%); /* Chrome10+,Safari5.1+ */
          background: -o-linear-gradient(top,  #4b4b4c 0%,#818184 100%); /* Opera 11.10+ */
          background: -ms-linear-gradient(top,  #4b4b4c 0%,#818184 100%); /* IE10+ */
          background: linear-gradient(to bottom,  #4b4b4c 0%,#818184 100%); /* W3C */
          filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#4b4b4c', endColorstr='#818184',GradientType=0 ); /* IE6-9 */
   }
   
   #seekbar .progress {
           z-index: 1010;
           position: absolute;
   
           background: #4591ce; /* Old browsers */
           background: -moz-linear-gradient(top,  #4591ce 0%, #3080c2 100%); /* FF3.6+ */
           background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#4591ce), color-stop(100%,#3080c2)); /* Chrome,Safari4+ */
           background: -webkit-linear-gradient(top,  #4591ce 0%,#3080c2 100%); /* Chrome10+,Safari5.1+ */
           background: -o-linear-gradient(top,  #4591ce 0%,#3080c2 100%); /* Opera 11.10+ */
           background: -ms-linear-gradient(top,  #4591ce 0%,#3080c2 100%); /* IE10+ */
           background: linear-gradient(to bottom,  #4591ce 0%,#3080c2 100%); /* W3C */
           filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#4591ce', endColorstr='#3080c2',GradientType=0 ); /* IE6-9 */
   }
   

5. Ascolta AdobePSDK.TimeChangeEvent e aggiorna la barra di ricerca di conseguenza.

   player.addEventListener(AdobePSDK.PSDKEventType.TIME_CHANGED, onTimeChange);
   
   /**
        * Called when the player's time changes.
        * Update UI to show current time, seekbar playhead position and buffer level.
        */
        function onTimeChange(event)
        {
          if (!seekBar.isSeeking) {
          var time = event.time;
          var range = player.playbackRange;
          seekBar.updatePlayhead(time, range);
          updateDisplayTime(time, range);
   
           var bufferedRange = player.bufferedRange;
           seekBar.updateBufferLevel(bufferedRange.end, range);
         }
   
       }
   

   In questo esempio viene creato un oggetto Sekbar per aggiornare la barra di ricerca:

   /**
       * Seekbar object which handles the display of the player progress,
       * playhead, and buffer level.
       */
       seekBar = (function () {
   
       var playheadHalfSize = 8, // must be half width of playhead defined in CSS
           containerElm = null,
           playheadElm = null,
           backerElm = null,
           bufferElm = null,
           progressElm = null,
           currentPos = 0, // [0,1] relative to range
           currentBuffer = 0,// [0,1] relative to range
           listener = null,
           isSeeking = false,
   
            setPositionChangeListener = function (funct) {
               listener = funct;
            },
   
            getSeekBarBounds = function () {
              return backerElm.getBoundingClientRect();
            },
   
            onPositionChange = function (event) {
                var pos = event.pageX || event.clientX;
                var bounds = getSeekBarBounds();
                // normalize position to seek bounds
                pos -= bounds.left;
                var percent = pos / (bounds.right - bounds.left);
   
                // check bounds
                 if (percent > 1) percent = 1;
                 else if (percent < 0) percent = 0;
   
                 currentPos = percent;
                 setPosition(percent);
              },
   
                 updatePlayhead = function (time, range) {
                 if (!isSeeking) {
                 var pos = convertTimeToRelativePosition(time, range);
                 setPosition(pos);
              }
            },
   
               setPosition = function (percent) {
               // adjust to keep playhead graphic inside container on right side
               var bounds = getSeekBarBounds();
               var pos = percent * (bounds.right - bounds.left);
   
               progressElm.style.width = (pos).toString() + "px";
               playheadElm.style.left = (pos-playheadHalfSize).toString() + "px";
   
               currentPos = percent;
               return percent;
   
               },
   
                updateBufferLevel = function (level, range) {
                if (!isSeeking) {
                    var position = convertTimeToRelativePosition(level, range);
                    setBufferLevel(position);
                   }
               },
   
                 setBufferLevel = function (percent) {
                    currentBuffer = percent;
                    var bounds = getSeekBarBounds();
                    var pos = percent * (bounds.right - bounds.left);
   
                           bufferElm.style.width = pos.toString() + "px";
                       },
   
                       resetSeekBar = function () {
                          setPosition(currentPos);
                          setBufferLevel(currentBuffer);
                       },
   
                       convertTimeToRelativePosition = function (time, range) {
                          // convert time to a percentage of the duration
                          var position = (time - range.begin) / range.duration;
                          if (position > 1) position = 1;
                          else if (position < 0) position = 0;
                          return position;
                       },
   
                       unattachEvents = function (e) {
                         this.removeEventListener('mousemove', onPositionChange);
                         this.removeEventListener('mouseout', unattachEvents);
                         this.removeEventListener('mouseup', unattachEvents);
   
                           this.addEventListener('mouseover', attachEvents);
                           isSeeking = false;
                       },
   
                       attachEvents = function (e) {
                          this.addEventListener('mousemove', onPositionChange);
                          this.addEventListener('mouseout', unattachEvents);
                          this.addEventListener('mouseup', unattachEvents);
                          isSeeking = true;
                          return false;
                       };
   
               return  {
                   init : function () {
                     containerElm = document.getElementById("seekbar");
                     backerElm = document.getElementById("backer");
                     playheadElm = document.getElementById("playhead");
                     bufferElm = document.getElementById("buffer");
                     progressElm = document.getElementById("progress");
   
                     // client seek via scrubbing
                     containerElm.addEventListener('mousedown', attachEvents);
   
                     // client seek via single click or 'mouseup' after scrubbing
                     containerElm.addEventListener('click', function (e) {
                        if (listener !== null && !player.areControlsDisabledInAd()) {
                           onPositionChange(e);
                           // callback to notify of desired seek position
                           listener.call(this, currentPos);
                           }
                       });
   
                       // end client seek via scrubbing
                       document.addEventListener('mouseup', function (e) {
                           containerElm.removeEventListener('mouseover', attachEvents);
                       });
                   },
   
                  /**
                  * Is the playhead currently being scrubbed.
                  */
                  isSeeking : isSeeking,
   
                  /**
                  * Change the position of the playhead.
                  * @param time - time in seconds to position playhead
                  * @param range - current playback range
                  */
                  updatePlayhead : updatePlayhead,
   
                  /**
                  * Change the position of the buffer range.
                  * @param time - time in seconds to position head of buffer
                  * @param range - current playback range
                  */
                  updateBufferLevel : updateBufferLevel,
   
                  /**
                  * Set listener which is called when the playhead position changes
                  * by the user event. Listener is not called when playhead position
                  * changes via updatePlayhead function.
                  * @param listener - callback function, passed single position argument
                  * representing the playhead position in the range [0,1].
                  */
                  setPositionChangeListener : setPositionChangeListener,
   
                  /**
                  * Readjust position levels if seekbar is resized.
                  * Should be called every time the video window changes size.
                  */
                  readjustSeekBar : resetSeekBar
               };
   
           })();
   

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