Bug 283034 – The audio is choppy and the playbackRate is not working when playing 2.0x audio with AudioContext.

• Component: Media
• Status: NEW

[Ronan Chi]

Created attachment 473213 [details]
Reproductions Files

I am using AudioContext API to mix audio track in iOS.

But I found that when setting playbackRate to 2.0, and use Audio Destination Node to create a new audio stream, the audio is choppy and the playbackRate is not working.

Is there any solution for this?

Reproductions Link: https://web.sdk.qcloud.com/trtc/webrtc/v5/test/qer/audio-mixer/ios.html

Reproductions Source Code: 

```js
function playMusicWithAudioContext(playbackRate = 1.0) {
    audioElement.pause();

    const newAudioElement = new Audio('./count.mp3');
    newAudioElement.playbackRate = playbackRate;
    const audioContext = new AudioContext();
    const node = audioContext.createMediaElementSource(newAudioElement);
    const destination = audioContext.createMediaStreamDestination();
    node.connect(destination);

    const stream = destination.stream;
    const player = document.createElement('audio');
    player.srcObject = stream;
    newAudioElement.play();
    player.play();
  }
```

I have same issue

[Radar WebKit Bug Importer]

<rdar://problem/140250592>