Quelle test_audioContextGC.html Sprache: HTML

products/Sources/formale Sprachen/C/Firefox/dom/media/webaudio/test/test_audioContextGC.html

<!DOCTYPE HTML>
<html>
<head>
  <title>Test inactive AudioContext is garbage collected</title>
  <script src="/tests/SimpleTest/SimpleTest.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
</head>
<body>
<script class="testbody" type="text/javascript">

SimpleTest.waitForExplicitFinish();

let ids;

const observer = (subject, topic, data) => {
  const id = parseInt(data);
  if (ids) {
    ok(ids.delete(id), "Collected AudioNode id " + id);
  }
}
SpecialPowers.addObserver(observer, "webaudio-node-demise");

SimpleTest.registerCleanupFunction(function() {
  if (observer) {
    SpecialPowers.removeObserver(observer, "webaudio-node-demise");
  }
});

function id(node) {
  return SpecialPowers.getPrivilegedProps(node, "id");
}

let tests = [{
  name: "Bare running AudioContext", setup: () => {
    const ac = new AudioContext();
    ids.add(id(ac.destination));
    // Await state change notification before collection.
    return new Promise((resolve) => {
      ac.onstatechange = () => {
        is(ac.state, "running", "ac.state");
        resolve();
      };
    });
  }
}, {
  name: "Stopped source", setup: () => {
    const ac = new AudioContext();
    ids.add(id(ac.destination));
    const source = new ConstantSourceNode(ac);
    ids.add(id(source));
    source.start();
    source.stop();
    // Await ended notification before collection.
    return new Promise((resolve) => {
      source.onended = () => {
        is(ac.state, "running", "ac.state");
        resolve();
      };
    });
  }
}, {
  name: "OfflineAudioContext not started", setup: () => {
    const ac = new OfflineAudioContext({
      numberOfChannels: 1, length: 1, sampleRate: 48000
    });
    ids.add(id(ac.destination));
    const source = new ConstantSourceNode(ac);
    ids.add(id(source));
    source.start();
  }
}, {
  name: "Completed OfflineAudioContext", setup: async () => {
    const ac = new OfflineAudioContext({
      numberOfChannels: 1, length: 1, sampleRate: 48000
    });
    ids.add(id(ac.destination));
    const sourceBeforeStart = new ConstantSourceNode(ac);
    ids.add(id(sourceBeforeStart));
    sourceBeforeStart.start();
    ac.startRendering();
    await new Promise((resolve) => {
      ac.oncomplete = () => {
        resolve();
      };
    });
    const sourceAfterComplete = new ConstantSourceNode(ac);
    ids.add(id(sourceAfterComplete));
    sourceAfterComplete.start();
  }
}, {
  name: "suspended AudioContext", setup: async () => {
    const ac = new AudioContext();
    ids.add(id(ac.destination));
    const sourceBeforeSuspend = new ConstantSourceNode(ac);
    ids.add(id(sourceBeforeSuspend));
    sourceBeforeSuspend.start();
    ac.suspend();
    const sourceAfterSuspend = new ConstantSourceNode(ac);
    ids.add(id(sourceAfterSuspend));
    sourceAfterSuspend.start();
    await new Promise((resolve) => {
      ac.onstatechange = () => {
        if (ac.state == "suspended") {
          resolve();
        }
      };
    });
    const sourceAfterSuspended = new ConstantSourceNode(ac);
    ids.add(id(sourceAfterSuspended));
    sourceAfterSuspended.start();
  }
}, {
  name: "closed AudioContext", setup: async () => {
    const ac = new AudioContext();
    ids.add(id(ac.destination));
    const sourceBeforeClose = new ConstantSourceNode(ac);
    ids.add(id(sourceBeforeClose));
    sourceBeforeClose.start();
    ac.close();
    const sourceAfterClose = new ConstantSourceNode(ac);
    ids.add(id(sourceAfterClose));
    sourceAfterClose.start();
    await new Promise((resolve) => {
      ac.onstatechange = () => {
        if (ac.state == "closed") {
          resolve();
        }
      };
    });
    const sourceAfterClosed = new ConstantSourceNode(ac);
    ids.add(id(sourceAfterClosed));
    sourceAfterClosed.start();
  }
}];

const start_next_test = async () => {
  const test = tests.shift();
  if (!test) {
    SimpleTest.finish();
    return;
  }
  // Collect all audio nodes from previous tests.
  if (!ids) {
    await new Promise(resolve => {
      SpecialPowers.exactGC(resolve);
    });
  }
  ids = new Set();
  await test.setup();
  SpecialPowers.exactGC(() => {
    is(ids.size, 0,
       `All expected nodes for "${test.name}" should be collected`);
    start_next_test();
  });
}

start_next_test();

</script>
</pre>
</body>
</html>

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