load audio playlist on MANIFEST_PARSED

src/controller/audio-track-controller.js

@@ -91,6 +91,8 @@ class AudioTrackController extends TaskLoop {
   onManifestParsed (data) {
     const tracks = this.tracks = data.audioTracks || [];
     this.hls.trigger(Event.AUDIO_TRACKS_UPDATED, { audioTracks: tracks });
+
+    this._selectAudioGroup(this.hls.nextLoadLevel);
   }
 
   /**
@@ -150,20 +152,7 @@ class AudioTrackController extends TaskLoop {
    * @param {*} data
    */
   onLevelLoaded (data) {
-    // FIXME: crashes because currentLevel is undefined
-    // const levelInfo = this.hls.levels[this.hls.currentLevel];
-
-    const levelInfo = this.hls.levels[data.level];
-
-    if (!levelInfo.audioGroupIds) {
-      return;
-    }
-
-    const audioGroupId = levelInfo.audioGroupIds[levelInfo.urlId];
-    if (this.audioGroupId !== audioGroupId) {
-      this.audioGroupId = audioGroupId;
-      this._selectInitialAudioTrack();
-    }
+    this._selectAudioGroup(data.level);
   }
 
   /**
@@ -252,6 +241,24 @@ class AudioTrackController extends TaskLoop {
     this._updateTrack(this._trackId);
   }
 
+  /**
+   * @param levelId
+   * @private
+   */
+  _selectAudioGroup (levelId) {
+    const levelInfo = this.hls.levels[levelId];
+
+    if (!levelInfo || !levelInfo.audioGroupIds) {
+      return;
+    }
+
+    const audioGroupId = levelInfo.audioGroupIds[levelInfo.urlId];
+    if (this.audioGroupId !== audioGroupId) {
+      this.audioGroupId = audioGroupId;
+      this._selectInitialAudioTrack();
+    }
+  }
+
   /**
    * Select initial track
    * @private

tests/unit/controller/audio-track-controller.js

@@ -80,6 +80,42 @@ describe('AudioTrackController', function () {
     });
   });
 
+  it('should select audioGroupId and trigger AUDIO_TRACK_SWITCHING', function (done) {
+    hls.on(Hls.Events.AUDIO_TRACK_SWITCHING, (event, data) => {
+      done();
+    });
+
+    const levels = [
+      {
+        urlId: 1,
+        audioGroupIds: ['1', '2']
+      }
+    ];
+
+    hls.levelController = {
+      levels
+    };
+
+    const newLevelInfo = levels[0];
+    const newGroupId = newLevelInfo.audioGroupIds[newLevelInfo.urlId];
+
+    audioTrackController.audioGroupId = '1';
+    audioTrackController.tracks = tracks;
+    audioTrackController.audioTrack = 2;
+
+    // current track name
+    const audioTrackName = tracks[audioTrackController.audioTrack].name;
+
+    audioTrackController.onManifestParsed({
+      audioTracks: tracks
+    });
+
+    // group has switched
+    expect(audioTrackController.audioGroupId).to.equal(newGroupId);
+    // name is still the same
+    expect(tracks[audioTrackController.audioTrack].name).to.equal(audioTrackName);
+  });
+
   describe('_needsTrackLoading', function () {
     it('should not need loading because the audioTrack is embedded in the main playlist', function () {
       expect(audioTrackController._needsTrackLoading({ details: { live: true } })).to.be.false;