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<!doctype html>
<html>
<head>
<meta charset=utf-8>
<meta name="timeout" content="long">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/gc.js"></script>
<script src="RTCPeerConnection-helper.js"></script>
</head>
<body>
<script>
'use strict';
// Check that RTCPeerConnection is not collected by GC while displaying video.
promise_test(async t => {
const canvas = document.createElement('canvas');
canvas.width = canvas.height = 160;
const ctx = canvas.getContext("2d");
ctx.fillStyle = "blue";
const drawCanvas = () => {
ctx.fillRect(0, 0, canvas.width, canvas.height);
};
let pc1 = new RTCPeerConnection();
let pc2 = new RTCPeerConnection();
// Attach video to pc1.
const [inputTrack] = canvas.captureStream().getTracks();
pc1.addTrack(inputTrack);
const destVideo = document.createElement('video');
destVideo.autoplay = true;
const onVideoChange = async () => {
const start = performance.now();
const width = destVideo.videoWidth;
const height = destVideo.videoHeight;
const resizeEvent = new Promise(r => destVideo.onresize = r);
while (destVideo.videoWidth == width && destVideo.videoHeight == height) {
if (performance.now() - start > 5000) {
throw new Error("Timeout waiting for video size change");
}
drawCanvas();
await Promise.race([
resizeEvent,
new Promise(r => requestAnimationFrame(r)),
]);
}
};
// Setup cleanup. We cannot keep references to pc1 or pc2 so do a best-effort with GC.
t.add_cleanup(async () => {
inputTrack.stop();
destVideo.srcObject = null;
await garbageCollect();
});
// Setup pc1->pc2.
let haveTrackEvent = new Promise(r => pc2.ontrack = r);
exchangeIceCandidates(pc1, pc2);
await pc1.setLocalDescription();
await pc2.setRemoteDescription(pc1.localDescription);
await pc2.setLocalDescription();
await pc1.setRemoteDescription(pc2.localDescription);
// Display pc2 received track in video element.
const loadedMetadata = new Promise(r => destVideo.onloadedmetadata = r);
destVideo.srcObject = new MediaStream([(await haveTrackEvent).track]);
// Wait for video on the other side.
await onVideoChange();
const color = getVideoSignal(destVideo);
assert_not_equals(color, 0);
// Remove RTCPeerConnection references and garbage collect.
pc1 = null;
pc2 = null;
haveTrackEvent = null;
await garbageCollect();
// Check that a change to video input is reflected in the output, i.e., the
// peer connections were not garbage collected.
canvas.width = canvas.height = 240;
ctx.fillStyle = "red";
await onVideoChange();
assert_not_equals(color, getVideoSignal(destVideo));
}, "GC does not collect a peer connection pipe rendering to a video element");
</script>
</body>
</html>
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