tor-browser

sources.js (2013B)

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function createAudioStream(t) {
 const ac = new AudioContext();
 const { stream } = ac.createMediaStreamDestination();
 const [track] = stream.getTracks();
 t.add_cleanup(() => {
   ac.close();
   track.stop();
 });
 return { stream };
}

function createFlowingAudioStream(t) {
 const ac = new AudioContext();
 const dest = ac.createMediaStreamDestination();
 const osc = ac.createOscillator();
 osc.connect(dest);
 osc.start();
 const [track] = dest.stream.getTracks();
 t.add_cleanup(() => {
   ac.close();
   track.stop();
 });
 return { stream: dest.stream };
}

function createVideoStream(t) {
 const canvas = document.createElement("canvas");
 canvas.id = "canvas";
 document.body.appendChild(canvas);
 const ctx = canvas.getContext("2d");
 const stream = canvas.captureStream();
 const [track] = stream.getTracks();
 t.add_cleanup(() => {
   document.body.removeChild(canvas);
   track.stop();
 });
 const addVideoFrame = () => {
   ctx.fillStyle = "red";
   ctx.fillRect(0, 0, canvas.width, canvas.height);
 };
 return { stream, control: { addVideoFrame } };
}

function createFlowingVideoStream(t) {
 const { stream } = createVideoStream(t);
 const [track] = stream.getTracks();
 const canvas = document.getElementById("canvas");
 const ctx = canvas.getContext("2d");
 ctx.fillStyle = "green";
 requestAnimationFrame(function draw() {
   ctx.fillRect(0, 0, canvas.width, canvas.height);
   if (track.readyState == "live") {
     requestAnimationFrame(draw);
   }
 });
 return { stream };
}

function createAudioVideoStream(t) {
 const { stream: audio } = createAudioStream(t);
 const { stream: video, control } = createVideoStream(t);
 return {
   stream: new MediaStream([...audio.getTracks(), ...video.getTracks()]),
   control,
 };
}

function createFlowingAudioVideoStream(t) {
 return {
   stream: new MediaStream([
     ...createFlowingAudioStream(t).stream.getTracks(),
     ...createFlowingVideoStream(t).stream.getTracks(),
   ]),
 };
}