feat: prefetch audio languages.

demo/config.js

@@ -424,7 +424,19 @@ shakaDemo.Config = class {
         .addBoolInput_('Parse PRFT box',
             'streaming.parsePrftBox')
         .addNumberInput_('Segment Prefetch Limit',
-            'streaming.segmentPrefetchLimit')
+            'streaming.segmentPrefetchLimit',
+            /* canBeDecimal= */ false,
+            /* canBeZero= */ true,
+            /* canBeUnset= */ true)
+        .addCustomTextInput_('Prefetch audio languages', (input) => {
+          shakaDemoMain.configure(
+              'streaming.prefetchAudioLanguages',
+              input.value.split(',').filter(Boolean));
+        })
+        .addBoolInput_('Disable Audio Prefetch',
+            'streaming.disableAudioPrefetch')
+        .addBoolInput_('Disable Video Prefetch',
+            'streaming.disableVideoPrefetch')
         .addBoolInput_('Live Sync', 'streaming.liveSync')
         .addNumberInput_('Max latency for live sync',
             'streaming.liveSyncMaxLatency',
@@ -752,27 +764,25 @@ shakaDemo.Config = class {
   addNumberInput_(name, valueName, canBeDecimal = false, canBeZero = true,
       canBeUnset = false, tooltipMessage) {
     const onChange = (input) => {
-      shakaDemoMain.resetConfiguration(valueName);
-      shakaDemoMain.remakeHash();
       if (input.value == 'Infinity') {
         shakaDemoMain.configure(valueName, Infinity);
-        shakaDemoMain.remakeHash();
-        return;
-      }
-      if (input.value == '' && canBeUnset) {
-        return;
-      }
-      const valueAsNumber = Number(input.value);
-      if (valueAsNumber == 0 && !canBeZero) {
-        return;
-      }
-      if (!isNaN(valueAsNumber)) {
-        if (Math.floor(valueAsNumber) != valueAsNumber && !canBeDecimal) {
-          return;
+      } else if (input.value == '' && canBeUnset) {
+        shakaDemoMain.resetConfiguration(valueName);
+      } else {
+        const valueAsNumber = Number(input.value);
+        if (valueAsNumber == 0 && !canBeZero) {
+          shakaDemoMain.resetConfiguration(valueName);
+        } else if (isNaN(valueAsNumber)) {
+          shakaDemoMain.resetConfiguration(valueName);
+        } else {
+          if (Math.floor(valueAsNumber) != valueAsNumber && !canBeDecimal) {
+            shakaDemoMain.resetConfiguration(valueName);
+          } else {
+            shakaDemoMain.configure(valueName, valueAsNumber);
+          }
         }
-        shakaDemoMain.configure(valueName, valueAsNumber);
-        shakaDemoMain.remakeHash();
       }
+      shakaDemoMain.remakeHash();
     };
     this.createRow_(name, tooltipMessage);
     this.latestInput_ = new shakaDemo.NumberInput(

externs/shaka/player.js

@@ -1137,6 +1137,9 @@ shaka.extern.ManifestConfiguration;
  *   maxDisabledTime: number,
  *   parsePrftBox: boolean,
  *   segmentPrefetchLimit: number,
+ *   prefetchAudioLanguages: !Array<string>,
+ *   disableAudioPrefetch: boolean,
+ *   disableVideoPrefetch: boolean,
  *   liveSync: boolean,
  *   liveSyncMaxLatency: number,
  *   liveSyncPlaybackRate: number,
@@ -1255,11 +1258,22 @@ shaka.extern.ManifestConfiguration;
  *   start date will not change, and would save parsing the segment multiple
  *   times needlessly.
  *   Defaults to <code>false</code>.
- * @property {boolean} segmentPrefetchLimit
+ * @property {number} segmentPrefetchLimit
  *   The maximum number of segments for each active stream to be prefetched
  *   ahead of playhead in parallel.
  *   If <code>0</code>, the segments will be fetched sequentially.
  *   Defaults to <code>0</code>.
+ * @property {!Array<string>} prefetchAudioLanguages
+ *   The audio languages to prefetch.
+ *   Defaults to an empty array.
+ * @property {boolean} disableAudioPrefetch
+ *   If set and prefetch limit is defined, it will prevent from prefetching data
+ *   for audio.
+ *   Defaults to <code>false</code>.
+ * @property {boolean} disableVideoPrefetch
+ *   If set and prefetch limit is defined, it will prevent from prefetching data
+ *   for video.
+ *   Defaults to <code>false</code>.
  * @property {boolean} liveSync
  *   Enable the live stream sync against the live edge by changing the playback
  *   rate. Defaults to <code>false</code>.

lib/media/segment_index.js

@@ -434,10 +434,11 @@ shaka.media.SegmentIndex = class {
    * Playlist will contain at least one independent frame."
    *
    * @param {number} time
+   * @param {boolean=} allowNonIndepedent
    * @return {?shaka.media.SegmentIterator}
    * @export
    */
-  getIteratorForTime(time) {
+  getIteratorForTime(time, allowNonIndepedent = false) {
     let index = this.find(time);
     if (index == null) {
       return null;
@@ -455,14 +456,16 @@ shaka.media.SegmentIndex = class {
         let r = ref.partialReferences[i];
         // Note that a segment ends immediately before the end time.
         if ((time >= r.startTime) && (time < r.endTime)) {
-          // Find an independent partial segment by moving backwards.
-          while (i && !r.isIndependent()) {
-            i--;
-            r = ref.partialReferences[i];
-          }
-          if (!r.isIndependent()) {
-            shaka.log.alwaysError('No independent partial segment found!');
-            return null;
+          if (!allowNonIndepedent) {
+            // Find an independent partial segment by moving backwards.
+            while (i && (!r.isIndependent())) {
+              i--;
+              r = ref.partialReferences[i];
+            }
+            if (!r.isIndependent()) {
+              shaka.log.alwaysError('No independent partial segment found!');
+              return null;
+            }
           }
           // Call to next() should move the partial segment, not the full
           // segment.