feat(FEC-8975): adding segment size in target buffer when exceeding m…

…axmax (#75)

adding segment size in target buffer when exceeding maxmax
adding url in frag_loaded

src/dash-adapter.js

@@ -461,7 +461,7 @@ export default class DashAdapter extends BaseMediaSourceAdapter {
     this._shaka.getNetworkingEngine().registerResponseFilter((type, response) => {
       switch (type) {
         case shaka.net.NetworkingEngine.RequestType.SEGMENT:
-          this._trigger(EventType.FRAG_LOADED, {miliSeconds: response.timeMs, bytes: response.data.byteLength});
+          this._trigger(EventType.FRAG_LOADED, {miliSeconds: response.timeMs, bytes: response.data.byteLength, url: response.uri});
           break;
         case shaka.net.NetworkingEngine.RequestType.MANIFEST:
           this._trigger(EventType.MANIFEST_LOADED, {miliSeconds: response.timeMs});
@@ -546,15 +546,19 @@ export default class DashAdapter extends BaseMediaSourceAdapter {
    */
   _getVideoTracks(): Array<Object> {
     let variantTracks = this._shaka.getVariantTracks();
-    let activeVariantTrack = variantTracks.filter(variantTrack => {
-      return variantTrack.active;
-    })[0];
+    let activeVariantTrack = this._getActiveTrack();
     let videoTracks = variantTracks.filter(variantTrack => {
       return variantTrack.audioId === activeVariantTrack.audioId;
     });
     return videoTracks;
   }
 
+  _getActiveTrack(): Object {
+    return this._shaka.getVariantTracks().filter(variantTrack => {
+      return variantTrack.active;
+    })[0];
+  }
+
   /**
    * Get the original audio tracks
    * @function _getAudioTracks
@@ -906,7 +910,27 @@ export default class DashAdapter extends BaseMediaSourceAdapter {
       targetBufferVal = this._videoElement.duration - this._videoElement.currentTime;
     }
 
-    targetBufferVal = Math.min(targetBufferVal, this._shaka.getConfiguration().streaming.bufferingGoal);
+    targetBufferVal = Math.min(targetBufferVal, this._shaka.getConfiguration().streaming.bufferingGoal + this._getCurrentSegmentLength());
     return targetBufferVal;
   }
+
+  _getCurrentSegmentLength(): number {
+    const activeTrack = this._getActiveTrack();
+    const activeTrackId = activeTrack ? activeTrack.id : NaN;
+    let segmentLength = 0;
+    const periods = this._shaka.getManifest().periods;
+    if (!isNaN(activeTrackId)) {
+      for (let i = 0; i < periods.length; i++) {
+        for (let j = 0; j < periods[i].variants.length; j++) {
+          const variant = periods[i].variants[j];
+          if (variant.id === activeTrackId) {
+            const segmentPosition = variant.video.findSegmentPosition(this._videoElement.currentTime);
+            let seg = variant.video.getSegmentReference(segmentPosition);
+            segmentLength = seg.endTime - seg.startTime;
+          }
+        }
+      }
+    }
+    return segmentLength;
+  }
 }