42 lines
1.6 KiB
HTML
42 lines
1.6 KiB
HTML
<!doctype html>
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<meta charset=utf-8>
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<title>getDisplayMedia</title>
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<meta name="timeout" content="long">
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<button id="button">User gesture</button>
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script src="/resources/testdriver.js"></script>
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<script src="/resources/testdriver-vendor.js"></script>
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<video id="display"></video>
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<script>
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'use strict';
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const stopTracks = stream => stream.getTracks().forEach(track => track.stop());
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async function getDisplayMedia(constraints) {
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const p = new Promise(r => button.onclick = r);
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await test_driver.click(button);
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await p;
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return navigator.mediaDevices.getDisplayMedia(constraints);
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}
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promise_test( async t => {
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const v = document.getElementById('display');
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v.autoplay = true;
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// work around firefox bug 1586505, orthogonal to what's being tested
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const frames = () => v.mozPaintedFrames ?? v.getVideoPlaybackQuality()?.totalVideoFrames;
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const target_rate = 5;
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const stream = await getDisplayMedia({video: {width:160, frameRate: target_rate}});
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t.add_cleanup(() => stopTracks(stream));
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v.srcObject = stream;
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const intitial_time = v.currentTime;
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const initial_frame_count = frames();
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await new Promise(r => t.step_timeout(r, 10000));
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const total_elapsed_frames = frames() - initial_frame_count;
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const total_elapsed_time = v.currentTime - intitial_time;
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const average_fps = total_elapsed_frames / total_elapsed_time;
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assert_greater_than_equal(average_fps, target_rate * 0.50);
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assert_less_than_equal(average_fps, target_rate * 1.75);
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}, "getDisplayMedia() must adhere to frameRate if set");
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</script>
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