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a/LayoutTests/fast/mediastream/MediaStream-video-element-video-tracks-disabled-then-enabled.html_sec1
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<!DOCTYPE html> |
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<html> |
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<head> |
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<script src="../../resources/js-test-pre.js"></script> |
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<script src="./resources/getUserMedia-helper.js"></script> |
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</head> |
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<body onload="start()"> |
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<p id="description"></p> |
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<div id="console"></div> |
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<video controls width="680" height="360"></video> |
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<canvas width="680" height="360"></canvas> |
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<script> |
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let canvas; |
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let context; |
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let mediaStream; |
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let video; |
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|
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let buffer; |
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|
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function isPixelBlack(pixel) |
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{ |
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return pixel[0] === 0 && pixel[1] === 0 && pixel[2] === 0 && pixel[3] === 255; |
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} |
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|
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function isPixelTransparent(pixel) |
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{ |
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return pixel[0] === 0 && pixel[1] === 0 && pixel[2] === 0 && pixel[3] === 0; |
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} |
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|
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function isPixelWhite(pixel) |
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{ |
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return pixel[0] === 255 && pixel[1] === 255 && pixel[2] === 255 && pixel[3] === 255; |
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} |
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|
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function attempt(numberOfTries, call, callback, successMessage) |
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{ |
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if (numberOfTries <= 0) { |
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testFailed('Pixel check did not succeed after multiple tries.'); |
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return; |
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} |
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|
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let attemptSucceeded = call(); |
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if (attemptSucceeded) { |
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testPassed(successMessage); |
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callback(); |
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return; |
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} |
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setTimeout(function() { |
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attempt(--numberOfTries, call, callback, successMessage); |
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}, 50); |
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} |
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|
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function repeatWithVideoPlayingAndFinishTest() |
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{ |
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if (video.paused) { |
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debug('<br> ===== play video ====='); |
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evalAndLog('video.play()'); |
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beginTestRound(); |
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} else |
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finishJSTest(); |
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} |
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|
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function reenableTrack() |
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{ |
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mediaStream.getVideoTracks()[0].enabled = true; |
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debug('<br> === video track reenabled ==='); |
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|
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// The video is not guaranteed to render non-black frames before the canvas is drawn to and the pixels are checked. |
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// A timeout is used to ensure that the pixel check is done after the video renders non-black frames. |
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attempt(10, checkPixels, repeatWithVideoPlayingAndFinishTest, 'pixel was white.'); |
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} |
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|
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function checkPixels() |
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{ |
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context.clearRect(0, 0, canvas.width, canvas.height); |
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buffer = context.getImageData(30, 242, 1, 1).data; |
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if(!isPixelTransparent(buffer)) { |
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testFailed('pixel was not transparent after clearing canvas.'); |
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} |
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context.drawImage(video, 0, 0, canvas.width, canvas.height); |
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buffer = context.getImageData(30, 242, 1, 1).data; |
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|
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if (mediaStream.getVideoTracks()[0].enabled) |
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return isPixelWhite(buffer); |
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else |
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return isPixelBlack(buffer); |
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} |
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|
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function disableAllTracks() |
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{ |
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mediaStream.getVideoTracks()[0].enabled = false; |
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debug('<br> === all video tracks disabled ==='); |
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// The video is not guaranteed to render black frames before the canvas is drawn to and the pixels are checked. |
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// A timeout is used to ensure that the pixel check is done after the video renders black frames. |
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attempt(10, checkPixels, reenableTrack, 'pixel was black.'); |
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} |
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function beginTestRound() |
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{ |
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debug('<br> === beginning round of pixel tests ==='); |
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attempt(1, checkPixels, disableAllTracks, 'pixel was white'); |
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} |
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|
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function canplay() |
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{ |
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canvas = document.querySelector('canvas'); |
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context = canvas.getContext('2d'); |
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|
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beginTestRound(); |
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} |
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|
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function start() |
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{ |
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description("Tests that re-enabling a video MediaStreamTrack when all tracks were previously disabled causes captured media to display."); |
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|
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video = document.querySelector('video'); |
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video.addEventListener('canplay', canplay); |
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getUserMedia("allow", {video:true}, setupVideoElementWithStream); |
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} |
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window.jsTestIsAsync = true; |
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</script> |
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<script src="../../resources/js-test-post.js"></script> |
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</body> |
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</html> |