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<!DOCTYPE html>
<meta charset="utf-8">
<meta name="timeout" content="long">
<title>Tests RTCRtpReceiver-jitterBufferTarget verified with stats</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/webrtc/RTCPeerConnection-helper.js"></script>
<body>
<script>
'use strict'
function async_promise_test(func, name, properties) {
async_test(t => {
Promise.resolve(func(t))
.catch(t.step_func(e => { throw e; }))
.then(() => t.done());
}, name, properties);
}
async_promise_test(t => applyJitterBufferTarget(t, "video", 4000),
"measure raising and lowering video jitterBufferTarget");
async_promise_test(t => applyJitterBufferTarget(t, "audio", 4000),
"measure raising and lowering audio jitterBufferTarget");
async function applyJitterBufferTarget(t, kind, target) {
const caller = new RTCPeerConnection();
t.add_cleanup(() => caller.close());
const callee = new RTCPeerConnection();
t.add_cleanup(() => callee.close());
const stream = await getNoiseStream({[kind]:true});
t.add_cleanup(() => stream.getTracks().forEach(track => track.stop()));
caller.addTransceiver(stream.getTracks()[0], {streams: [stream]});
caller.addTransceiver(stream.getTracks()[0], {streams: [stream]});
exchangeIceCandidates(caller, callee);
await exchangeOffer(caller, callee);
const [unconstrainedReceiver, constrainedReceiver] = callee.getReceivers();
const haveRtp = Promise.all([
new Promise(r => constrainedReceiver.track.onunmute = r),
new Promise(r => unconstrainedReceiver.track.onunmute = r)
]);
await exchangeAnswer(caller, callee);
const chromeTimeout = new Promise(r => t.step_timeout(r, 1000)); // crbug.com/1295295
await Promise.race([haveRtp, chromeTimeout]);
// Allow some data to be processed to let the jitter buffer to stabilize a bit before measuring
await new Promise(r => t.step_timeout(r, 5000));
t.step(() => assert_equals(constrainedReceiver.jitterBufferTarget, null,
`jitterBufferTarget supported for ${kind}`));
constrainedReceiver.jitterBufferTarget = target;
t.step(() => assert_equals(constrainedReceiver.jitterBufferTarget, target,
`jitterBufferTarget increase target for ${kind}`));
const [increased, base] = await Promise.all([
measureDelayFromStats(t, constrainedReceiver, 20),
measureDelayFromStats(t, unconstrainedReceiver, 20)
]);
t.step(() => assert_greater_than(increased , base,
`${kind} increased delay ${increased} ` +
` greater than base delay ${base}`));
constrainedReceiver.jitterBufferTarget = 0;
// Allow the jitter buffer to stabilize a bit before measuring
await new Promise(r => t.step_timeout(r, 5000));
t.step(() => assert_equals(constrainedReceiver.jitterBufferTarget, 0,
`jitterBufferTarget decrease target for ${kind}`));
const decreased = await measureDelayFromStats(t, constrainedReceiver, 20);
t.step(() => assert_less_than(decreased, increased,
`${kind} decreasedDelay ${decreased} ` +
`less than increased delay ${increased}`));
}
async function measureDelayFromStats(t, receiver, cycles) {
let statsReport = await receiver.getStats();
const oldInboundStats = [...statsReport.values()].find(({type}) => type == "inbound-rtp");
await new Promise(r => t.step_timeout(r, 1000 * cycles));
statsReport = await receiver.getStats();
const inboundStats = [...statsReport.values()].find(({type}) => type == "inbound-rtp");
const delay = ((inboundStats.jitterBufferDelay - oldInboundStats.jitterBufferDelay) /
(inboundStats.jitterBufferEmittedCount - oldInboundStats.jitterBufferEmittedCount) * 1000);
return delay;
}
</script>
</body>
|
