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使用音量增益时如何正确释放audioContext

[英]How to properly release audioContext when using volume gain

使用WebRTC时,在我停止播放流后,网络摄像头指示灯将熄灭,并且chrome标签上的“红点”将消失。 (如下图所示)

标签上的红点

vid = document.createElement('VIDEO');
vid.style.width = 100;
vid.style.height = 100;
vid.style.top = 100;
vid.style.left = 0;
vid.style.position = 'absolute';
vid.style.border = '1px solid red';
vid.id = 'xxx';
document.body.insertBefore(vid,document.body.childNodes[0]);
xxx = document.getElementById('xxx');
var xstream = null;

navigator.webkitGetUserMedia({video:true, audio:true},
  function(stream) {
    xstream = stream;    
    xxx.src = window.URL.createObjectURL(stream);
  },
  function(error) {
    console.log('err', error);
  }
);
xxx.play();

因此,当我执行以下操作时:

xstream.stop();

我很好,网络摄像头指示灯熄灭,并且选项卡上的红点立即消失。

但是当我使用如下所示的“ audioContext”时:

vid = document.createElement('VIDEO');
vid.style.width = 100;
vid.style.height = 100;
vid.style.top = 100;
vid.style.left = 0;
vid.style.position = 'absolute';
vid.style.border = '1px solid red';
vid.id = 'xxx';
document.body.insertBefore(vid,document.body.childNodes[0]);
xxx = document.getElementById('xxx');
var xstream = null
    wp = {};

navigator.webkitGetUserMedia({video:true, audio:true},
  function(stream) {
    xstream = stream;

    wp.audio = {
        source: null,
        volume: null,
        enabled: true
    }
    wp.audioContext = new window.AudioContext();
    wp.audio.source = wp.audioContext.createMediaStreamSource(stream);
    wp.audio.volume = wp.audioContext.createGain();
    wp.audio.destination = wp.audioContext.createMediaStreamDestination();
    wp.audio.outputStream = wp.audio.destination.stream;
    wp.audio.source.connect(wp.audio.volume);
    wp.audio.volume.connect(wp.audio.destination);
    stream.addTrack(wp.audio.outputStream.getAudioTracks()[0]);
    stream.removeTrack(stream.getAudioTracks()[0]);

    xxx.src = window.URL.createObjectURL(stream);
  },
  function(error) {
    console.log('err', error);
  }
);
xxx.play();

如果我只是执行xstream.stop(),尽管网络摄像头指示灯熄灭,但是红点仍然显示。

但是,如果我执行以下操作:

wp.audio.source.mediaStream.stop();
wp.audio.destination.stream.stop();
wp.audio.outputStream.stop();
wp.audio.source.disconnect();
wp.audio.volume.disconnect();
wp.audio.destination = null;
wp.audio.source = null;
wp.audio.volume = null;
wp.audio.outputStream = null;
wp.audioContext.close();
xstream.stop();
xxx.src = '';

有时红点会消失,大多数时候不会消失。 当它消失时,通常需要20-40秒,有时甚至更多。

不知道我在这里做错了什么。

注意:您可以将代码复制并粘贴到控制台中进行尝试

也许您可以尝试在stream.removeTrack之前停止流

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