Hijack the mic and pass in a screen/tab captures audio instead

micHijack.js

/*
Add this to what ever and when it tries to connect with the mic it will connect with screen/tab sharing instead
and can pipe its audio into whatever instead.  On linux you'll only be able to stream the audio of another tab,
but on windows you can pick screen plus audio and get the full system audio...sweet!!!!
*/

// Overwrite the browser's microphone API right on the webpage
navigator.mediaDevices.getUserMedia = async function(constraints) {
  if (constraints && constraints.audio) {
    console.log("Intercepted OpenProcessing mic request! Diverting to system audio...");
    try {
      // Prompt the user for system audio instead of the microphone
      let stream = await navigator.mediaDevices.getDisplayMedia({
        video: true, // Required by Chrome to trigger the prompt
        audio: { systemAudio: "include" }
      });
      return stream;
    } catch(e) {
      console.error("User denied system audio sharing.", e);
    }
  }
};