Overwrite manifest mediaPresentationDuration if duration mismatch (Da…

…sh-Industry-Forum#3971)

* Overwrite manifest mediaPresentationDuration attribute with the sum of all period durations if there is a mismatch between the two

* Created config option to disable automatically overwriting mediaPresentationDuration when there is a mismatch between it and the sum of all period durations in a multi-period manifest

* Changed type from number to boolean for settings flag

* Corrected settings type in typings file and added setting to example jsdoc

index.d.ts

@@ -155,6 +155,7 @@ declare namespace dashjs {
             applyServiceDescription?: boolean,
             cacheInitSegments?: boolean,
             eventControllerRefreshDelay?: number,
+            enableManifestDurationMismatchFix?: boolean,
             capabilities?: {
                 filterUnsupportedEssentialProperties?: boolean,
                 useMediaCapabilitiesApi?: boolean

src/core/Settings.js

@@ -66,6 +66,7 @@ import Events from './events/Events';
  *            applyServiceDescription: true,
  *            applyProducerReferenceTime: true,
  *            eventControllerRefreshDelay: 100,
+ *            enableManifestDurationMismatchFix: true,
  *            capabilities: {
  *               filterUnsupportedEssentialProperties: true,
  *               useMediaCapabilitiesApi: false
@@ -665,6 +666,8 @@ import Events from './events/Events';
  * @property {boolean} [applyProducerReferenceTime=true]
  * Set to true if dash.js should use the parameters defined in ProducerReferenceTime elements in combination with ServiceDescription elements.
  * @property {number} [eventControllerRefreshDelay=100]
+ * For multi-period streams, overwrite the manifest mediaPresentationDuration attribute with the sum of period durations if the manifest mediaPresentationDuration is greater than the sum of period durations
+ * @property {boolean} [enableManifestDurationMismatchFix=true]
  * Defines the delay in milliseconds between two consecutive checks for events to be fired.
  * @property {module:Settings~Metrics} metrics Metric settings
  * @property {module:Settings~LiveDelay} delay Live Delay settings
@@ -768,6 +771,7 @@ function Settings() {
             applyServiceDescription: true,
             applyProducerReferenceTime: true,
             eventControllerRefreshDelay: 100,
+            enableManifestDurationMismatchFix: true,
             capabilities: {
                 filterUnsupportedEssentialProperties: true,
                 useMediaCapabilitiesApi: false

src/streaming/ManifestLoader.js

@@ -47,6 +47,7 @@ function ManifestLoader(config) {
     config = config || {};
     const context = this.context;
     const debug = config.debug;
+    const settings = config.settings;
     const eventBus = EventBus(context).getInstance();
     const urlUtils = URLUtils(context).getInstance();
 
@@ -194,6 +195,20 @@ function ManifestLoader(config) {
                         logger.debug('BaseURI set by Location to: ' + baseUri);
                     }
 
+                    // If there is a mismatch between the manifest's specified duration and the total duration of all periods,
+                    // and the specified duration is greater than the total duration of all periods,
+                    // overwrite the manifest's duration attribute. This is a patch for if a manifest is generated incorrectly.
+                    if (settings &&
+                        settings.get().streaming.enableManifestDurationMismatchFix &&
+                        manifest.mediaPresentationDuration &&
+                        manifest.Period_asArray.length > 1) {
+                        const sumPeriodDurations = manifest.Period_asArray.reduce((totalDuration, period) => totalDuration + period.duration, 0);
+                        if (manifest.mediaPresentationDuration > sumPeriodDurations) {
+                            logger.warn('Media presentation duration greater than duration of all periods. Setting duration to total period duration');
+                            manifest.mediaPresentationDuration = sumPeriodDurations;
+                        }
+                    }
+
                     manifest.baseUri = baseUri;
                     manifest.loadedTime = new Date();
                     xlinkController.resolveManifestOnLoad(manifest);