javascript - 如何使用 RTCMultiConnection 再次从共享屏幕切换到相机

Question

我需要再次从共享屏幕切换到视频。我首先使用此代码共享屏幕。connection.addStream ({ screen: true, oneway: true, streamCallback: function (screen) { addStreamStopListener (screen, function () { selectFrontCameraDuringActiveSession (); }); }, })

然后我使用此代码再次显示我做错的视频。

    connection.attachStreams.forEach (function (stream) {
      // stop only video tracks
      // so that we can recapture video track
      stream.getVideoTracks (). forEach (function (track) {
        track.stop ();
      });
    });

    var mediaConstraints = {
      audio: false, // NO need to capture audio again
      video: {
        facingMode: "application",
      },
    };

    navigator.mediaDevices
      .getUserMedia (mediaConstraints)
      .then (function (frontCamera) {
        var frontCameraTrack = frontCamera.getVideoTracks () [0];
        //video.srcObject = frontCamera;
        connection.getAllParticipants (). forEach (function (pid) {
          connection.peers [pid] .peer
            .getSenders ()
            .forEach (function (sender) {
              if (sender.track.kind == "video") {
                sender.replaceTrack (frontCameraTrack);
              }
            });
        });
        app.toggleShareScreen = false;
      });

每个倾听的人都会得到改变。但是传递变化的那个人并没有反映出来。并关闭视频和激活视频，例如停止工作。

        if (value === false) {
          connection.attachStreams.forEach (function (stream) {
            stream.getVideoTracks (). forEach ((t) => (t.enabled = value));
          });
        }
        if (value === true) {
          connection.attachStreams.forEach (function (stream) {
            stream.getVideoTracks (). forEach ((t) => (t.enabled = value));
          });
        }