<!DOCTYPEhtml>
<html>
<head>
<title>Test Encrypted Media Extensions - Protection Query</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
<script type="text/javascript" src="manifest.js"></script>
<script type="text/javascript" src="eme.js"></script>
</head>
<body>
<pre id="test">
<script class="testbody" type="text/javascript">
// Tests in this file check that output protection queries are performed and
// handled correctly. This is done by using a special clear key key system that
// emits key status to track protection status.
// Special key system used for these tests.
const kClearKeyWithProtectionQuery = "org.mozilla.clearkey_with_protection_query";
const kTestFile = "bipbop-cenc-video-10s.mp4";
const kTestMimeType = 'video/mp4; codecs="avc1.4d4015"';
const kTestKeyId = "7e571d037e571d037e571d037e571d11"; // Hex representation
const kTestKey = "7e5733337e5733337e5733337e573311";
// This is the special key-id used by the mozilla clearkey CDM to signal
// protection query status. As hex it is "6f75747075742d70726f74656374696f6e",
// the hex translates to ascii "output-protection".
const kProtectionQueryKeyIdString = "output-protection";
// Helper to setup EME on `video`.
// @paramvideo the HTMLMediaElement to configure EME on.
// @returns a media key session for the video. Callers can use this to
// configure the `onkeystatuseschange` event handler for each test. Callers
// *should not* configure other aspects of the session as this helper already
// does so.
async function setupEme(video) {
// Start setting up EME.
let access = await navigator.requestMediaKeySystemAccess(
kClearKeyWithProtectionQuery,
kKeySystemOptions
);
let mediaKeys = await access.createMediaKeys();
await video.setMediaKeys(mediaKeys);
let session = video.mediaKeys.createSession();
video.onencrypted = async encryptedEvent => {
session.onmessage = () => {
// Handle license messages. Hard code the license because we always test
// with the same file and we know what the license should be.
const license = {
keys: [
{
kty: "oct",
kid: HexToBase64(kTestKeyId),
k: HexToBase64(kTestKey),
},
],
type: "temporary",
};
const encodedLicense = new TextEncoder().encode(JSON.stringify(license));
// Helper to setup MSE media on `video`.
// @paramvideo the HTMLMediaElement to configure MSE on.
async function setupMse(video) {
const mediaSource = new MediaSource(); video.src = URL.createObjectURL(mediaSource);
await once(mediaSource, "sourceopen");
const sourceBuffer = mediaSource.addSourceBuffer("video/mp4");
let fetchResponse = await fetch(kTestFile);
sourceBuffer.appendBuffer(await fetchResponse.arrayBuffer());
await once(sourceBuffer, "updateend");
mediaSource.endOfStream();
await once(mediaSource, "sourceended");
}
// Helper to create a video element and append it to the page.
function createAndAppendVideo() {
const video = document.createElement("video"); video.id = "video";
// Loop in case tests run slowly, we want video to keep playing until we
// get expected events. video.loop = true;
document.body.appendChild(video);
return video;
}
// Helper to remove a video from the page.
function removeVideo() {
let video = document.getElementById("video");
CleanUpMedia(video);
}
// Helper to get the status for the kProtectionQueryKeyIdString key id. A
// session can (and will) have other keys with their own status, but we want
// to check this special key to find the protection query status.
function getKeyStatusForProtectionKeyId(session) {
for (let [keyId, status] of session.keyStatuses) {
if (ArrayBufferToString(keyId) == kProtectionQueryKeyIdString) {
return status;
}
}
return null;
}
async function getDisplayMedia() {
SpecialPowers.wrap(document).notifyUserGestureActivation();
return navigator.mediaDevices.getDisplayMedia();
}
// Tests playing encrypted media, starting a screen capture during playback,
// then stopping the capture while playback continues.
async function testProtectionQueryWithCaptureDuringVideo() {
let video = createAndAppendVideo();
// Configure the video and start it playing. KeyId should be usable (not restricted).
let session = await setupEme(video);
let keyStatusChangedPromise1 = new Promise(
resolve =>
(session.onkeystatuseschange = () => {
// We may get status changes prior to kProtectionQueryKeyIdString changing,
// ensure we wait for the first kProtectionQueryKeyIdString change.
if (getKeyStatusForProtectionKeyId(session)) {
resolve();
}
})
);
await setupMse(video);
await Promise.all([video.play(), keyStatusChangedPromise1]);
is(
getKeyStatusForProtectionKeyId(session), "usable", "Should be usable as capture hasn't started"
);
let keyStatusChangedPromise2 = new Promise(
resolve => (session.onkeystatuseschange = resolve)
);
let [displayMediaStream] = await Promise.all([
// Start a screen capture, this should restrict output.
getDisplayMedia(),
keyStatusChangedPromise2,
]);
is(
getKeyStatusForProtectionKeyId(session), "output-restricted", "Should be output-restricted as capture is happening"
);
// Stop the screen capture, output should be usable again.
let keyStatusChangedPromise3 = new Promise(
resolve => (session.onkeystatuseschange = resolve)
);
displayMediaStream.getTracks().forEach(track => track.stop());
displayMediaStream = null;
await keyStatusChangedPromise3;
is(
getKeyStatusForProtectionKeyId(session), "usable", "Should be usable as capture has stopped"
);
removeVideo();
}
// Tests starting a screen capture, then starting encrypted playback, then
// stopping the screen capture while encrypted playback continues.
async function testProtectionQueryWithCaptureStartingBeforeVideo() {
// Start capture before setting up video.
let displayMediaStream = await getDisplayMedia();
let video = createAndAppendVideo();
// Configure the video and start it playing. KeyId should be restricted already.
let session = await setupEme(video);
let keyStatusChangedPromise1 = new Promise(
resolve =>
(session.onkeystatuseschange = () => {
// We may get status changes prior to kProtectionQueryKeyIdString changing,
// ensure we wait for the first kProtectionQueryKeyIdString change. In
// rare cases the first protection status can be "usable" due to racing
// between playback and the machinery that detects WebRTC capture. To
// avoid this, wait for the first 'output-restricted' notification,
// which will either be the first event, or will quickly follow 'usable'.
if (getKeyStatusForProtectionKeyId(session) == "output-restricted") {
resolve();
}
})
);
await setupMse(video);
await Promise.all([video.play(), keyStatusChangedPromise1]);
is(
getKeyStatusForProtectionKeyId(session), "output-restricted", "Should be restricted as capture is happening"
);
// Stop the screen capture, output should be usable again.
let keyStatusChangedPromise2 = new Promise(
resolve => (session.onkeystatuseschange = resolve)
);
displayMediaStream.getTracks().forEach(track => track.stop());
displayMediaStream = null;
await keyStatusChangedPromise2;
is(
getKeyStatusForProtectionKeyId(session), "usable", "Should be usable as capture has stopped"
);
removeVideo();
}
add_task(async function setupEnvironment() {
await SpecialPowers.pushPrefEnv({
set: [
// Need test key systems for test key system.
["media.clearkey.test-key-systems.enabled", true],
// Need relaxed navigator permissions for getDisplayMedia.
["media.navigator.permission.disabled", true],
],
});
});
add_task(testProtectionQueryWithCaptureDuringVideo);
add_task(testProtectionQueryWithCaptureStartingBeforeVideo);
</script>
</pre>
</body>
</html>
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