audio-stream-controller: ensure we buffer at least config.maxBufferLe…

…ngth (default 30s)

once we reach that threshold, don't buffer more than video (mainBufferInfo.len)

related to video-dev#1342

src/controller/audio-stream-controller.js

@@ -189,11 +189,15 @@ class AudioStreamController extends EventHandler {
           }
         }
         let media = this.mediaBuffer ? this.mediaBuffer : this.media,
+            videoBuffer = this.videoBuffer ? this.videoBuffer : this.media,
             bufferInfo = BufferHelper.bufferInfo(media,pos,config.maxBufferHole),
+            mainBufferInfo = BufferHelper.bufferInfo(videoBuffer,pos,config.maxBufferHole),
             bufferLen = bufferInfo.len,
             bufferEnd = bufferInfo.end,
             fragPrevious = this.fragPrevious,
-            maxBufLen = config.maxMaxBufferLength,
+            // ensure we buffer at least config.maxBufferLength (default 30s)
+            // once we reach that threshold, don't buffer more than video (mainBufferInfo.len)
+            maxBufLen = Math.max(config.maxBufferLength,mainBufferInfo.len),
             audioSwitch = this.audioSwitch,
             trackId = this.trackId;
 
@@ -450,7 +454,7 @@ class AudioStreamController extends EventHandler {
       media.removeEventListener('ended', this.onvended);
       this.onvseeking = this.onvseeked  = this.onvended = null;
     }
-    this.media = this.mediaBuffer = null;
+    this.media = this.mediaBuffer = this.videoBuffer = null;
     this.loadedmetadata = false;
     this.stopLoad();
   }
@@ -758,6 +762,9 @@ class AudioStreamController extends EventHandler {
       this.mediaBuffer = audioTrack.buffer;
       this.loadedmetadata = true;
     }
+    if (data.tracks.video) {
+      this.videoBuffer = data.tracks.video.buffer;
+    }
   }
 
   onBufferAppended(data) {