fix: calling detatchMedia() followed by attachMedia() causes audio to not play

src/controller/audio-stream-controller.js

@@ -381,6 +381,7 @@ class AudioStreamController extends BaseStreamController {
     }
     this.media = this.mediaBuffer = this.videoBuffer = null;
     this.loadedmetadata = false;
+    this.fragmentTracker.removeAllFragments();
     this.stopLoad();
   }
 

src/controller/buffer-controller.ts

@@ -47,6 +47,9 @@ class BufferController extends EventHandler {
   // signals that mediaSource should have endOfStream called
   private _needsEos: boolean = false;
 
+  // Track whether the parsed manifest signaled alternate audio
+  private _altAudio: boolean = false;
+
   private config: BufferControllerConfig;
 
   // this is optional because this property is removed from the class sometimes
@@ -143,6 +146,7 @@ class BufferController extends EventHandler {
     // sourcebuffers will be created all at once when the expected nb of tracks will be reached
     // in case alt audio is not used, only one BUFFER_CODEC event will be fired from main stream controller
     // it will contain the expected nb of source buffers, no need to compute it
+    this._altAudio = data.altAudio;
     this.bufferCodecEventsExpected = data.altAudio ? 2 : 1;
     logger.log(`${this.bufferCodecEventsExpected} bufferCodec event(s) expected`);
   }
@@ -202,6 +206,7 @@ class BufferController extends EventHandler {
       this.mediaSource = null;
       this.media = null;
       this._objectUrl = null;
+      this.bufferCodecEventsExpected = this._altAudio ? 2 : 1;
       this.pendingTracks = {};
       this.tracks = {};
       this.sourceBuffer = {};

src/controller/stream-controller.js

@@ -691,6 +691,7 @@ class StreamController extends BaseStreamController {
       media.removeEventListener('ended', this.onvended);
       this.onvseeking = this.onvseeked = this.onvended = null;
     }
+    this.fragmentTracker.removeAllFragments();
     this.media = this.mediaBuffer = null;
     this.loadedmetadata = false;
     this.stopLoad();
@@ -735,6 +736,7 @@ class StreamController extends BaseStreamController {
       logger.log('both AAC/HE-AAC audio found in levels; declaring level codec as HE-AAC');
     }
 
+    this.altAudio = data.altAudio;
     this.levels = data.levels;
     this.startFragRequested = false;
     let config = this.config;