MediaStreamTrack-transfer-to-worker-source-lifetime.https.html

Enable keyboard shortcuts

This test has a WPT meta file that expects 2 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /mediacapture-extensions/MediaStreamTrack-transfer-to-worker-source-lifetime.https.html - WPT Dashboard Interop Dashboard

<!doctype html>

<meta charset=utf-8>

<title>MediaStreamTrack transferred to a dedicated worker stays tied to the source of the original context</title>

<link rel="help" href="https://w3c.github.io/mediacapture-extensions/#transferable-mediastreamtrack">

<script src=/resources/testharness.js></script>

<script src=/resources/testharnessreport.js></script>

<script src=/resources/testdriver.js></script>

<script src=/resources/testdriver-vendor.js></script>

<script src=/mediacapture-streams/permission-helper.js></script>

<script src=support/transfer-helper.js></script>

<script>

"use strict";

promise_setup(() => setMediaPermission());

promise_test(async t => {

  const worker = await createWorker(t, TRACK_WORKER_SCRIPT);

  const track = await getTrack(t, "video");

  const clone = track.clone();

  await callWorker(worker, {type: "receive", track: clone}, [clone]);

  let size = await callWorker(worker, {type: "readFrame"});

  assert_greater_than(size.width, 0, "frames flow before stopping");

  assert_greater_than(size.height, 0, "frames flow before stopping");

  track.stop();

  size = await callWorker(worker, {type: "readFrame"});

  assert_greater_than(size.width, 0, "frames flow after stopping");

  assert_greater_than(size.height, 0, "frames flow after stopping");

  const state = await callWorker(worker, {type: "state"});

  assert_equals(state.readyState, "live");

  assert_array_equals(await callWorker(worker, {type: "events"}), []);

}, "Stopping the original track does not end a transferred clone");

promise_test(async t => {

  const worker = await createWorker(t, TRACK_WORKER_SCRIPT);

  const iframe = document.createElement("iframe");

  t.add_cleanup(() => iframe.remove());

  const received = new Promise(resolve => {

    window.addEventListener("message", e => resolve(e.data), {once: true});

});

  iframe.src = "support/iframe-getUserMedia-transfer.html";

  document.body.appendChild(iframe);

  const track = await received;

  assert_true(track instanceof MediaStreamTrack,

              `got a track from the iframe: ${JSON.stringify(track)}`);

  await callWorker(worker, {type: "receive", track}, [track]);

  const size = await callWorker(worker, {type: "readFrame"});

  assert_greater_than(size.width, 0, "frames flow before removing the iframe");

  assert_greater_than(size.height, 0, "frames flow before removing the iframe");

  iframe.remove();

  await callWorker(worker, {type: "waitForEvent", name: "ended"});

  const state = await callWorker(worker, {type: "state"});

  assert_equals(state.readyState, "ended");

}, "Destroying the capturing context ends a transferred track");

</script>