Source code
Revision control
Copy as Markdown
Other Tools
Test Info:
- This WPT test may be referenced by the following Test IDs:
- /mediacapture-streams/MediaDevices-enumerateDevices-returned-objects.https.html - WPT Dashboard Interop Dashboard
<!doctype html>
<html>
<head>
<title>enumerateDevices is returning new MediaDeviceInfo objects every time</title>
<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=permission-helper.js></script>
</head>
<body>
<script>
function doTest(callGetUserMedia, testName)
{
promise_test(async () => {
if (callGetUserMedia) {
await setMediaPermission();
await navigator.mediaDevices.getUserMedia({audio : true, video: true});
}
const deviceList1 = await navigator.mediaDevices.enumerateDevices();
const deviceList2 = await navigator.mediaDevices.enumerateDevices();
assert_equals(deviceList1.length, deviceList2.length);
for (let i = 0; i < deviceList1.length; i++) {
const device1 = deviceList1[i];
const device2 = deviceList2[i];
assert_not_equals(device1, device2);
assert_equals(device1.deviceId, device2.deviceId, "deviceId");
assert_equals(device1.kind, device2.kind, "kind");
if (!callGetUserMedia) {
/* For camera and microphone devices,
if the browsing context did not capture (i.e. getUserMedia() was not called or never resolved successfully),
the MediaDeviceInfo object will contain a valid value for kind
but empty strings for deviceId, label, and groupId. */
assert_equals(device1.deviceId, "", "deviceId is empty before capture");
assert_equals(device1.groupId, "", "groupId is empty before capture");
assert_equals(device1.label, "", "label is empty before capture");
assert_in_array(device1.kind, ["audioinput", "audiooutput", "videoinput"],
"kind is set to a valid value before capture");
}
}
/* Additionally, at most one device of each kind
will be listed in enumerateDevices() result. */
// FIXME: ensure browsers are tested as if they had multiple devices of at least one kind -
if (!callGetUserMedia) {
const deviceKinds = deviceList1.map(d => d.kind);
for (let kind of deviceKinds) {
assert_equals(deviceKinds.filter(x => x===kind).length, 1, "At most 1 " + kind + " prior to capture");
}
}
}, testName);
}
doTest(false, "enumerateDevices exposes mostly empty objects ahead of successful getUserMedia call");
doTest(true, "enumerateDevices exposes expected objects after successful getUserMedia call");
</script>
</body>
</html>