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Bug 1741244 - p6: wait for frame encoded in capture throttle test. r=jib

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Initializing platform encoders often takes some time and the frame
rate measured is lower than actual number when the counting starts as
soon as connection established. Delaying the measurement until there
is at least some frame encoded makes it more accurate.

Differential Revision: https://phabricator.services.mozilla.com/D141513
This commit is contained in:
John Lin 2022-04-02 01:20:26 +00:00
parent 4087c24a22
commit 0b6b47af6f
1 changed files with 9 additions and 7 deletions
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16
dom/canvas/test/test_capture_throttled.html
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@ -96,18 +96,20 @@ async function measureCanvasCaptureFrameRate(captureRate) {
[...stats.values()].find(({type}) => type == "outbound-rtp");
return outbound?.framesEncoded ?? 0;
};
is(await getFrameCount(), 0, "frame count starts at 0");
// Wait for frame count change to ensure sender is working.
while (await getFrameCount() == 0) {
h.drawColor(c, h.green);
await new Promise(resolve => setTimeout(resolve, intervalMillis));
}
const startFrameCount = await getFrameCount();
const start = performance.now();
let end;
while(true) {
let end = start;
while(end - start <= 1000) {
h.drawColor(c, h.green);
await new Promise(resolve => setTimeout(resolve, intervalMillis));
end = performance.now();
if (end - start > 1000) {
break;
}
}
const framerate = (await getFrameCount()) / ((end - start) / 1000);
const framerate = (await getFrameCount() - startFrameCount) / ((end - start) / 1000);
pc1.close();
pc2.close();
return framerate;