From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001 From: "Matt A. Tobin" <mattatobin@localhost.localdomain> Date: Fri, 2 Feb 2018 04:16:08 -0500 Subject: Add m-esr52 at 52.6.0 --- dom/media/tests/mochitest/blacksilence.js | 121 ++++++++++++++++++++++++++++++ 1 file changed, 121 insertions(+) create mode 100644 dom/media/tests/mochitest/blacksilence.js (limited to 'dom/media/tests/mochitest/blacksilence.js') diff --git a/dom/media/tests/mochitest/blacksilence.js b/dom/media/tests/mochitest/blacksilence.js new file mode 100644 index 000000000..cad3b5515 --- /dev/null +++ b/dom/media/tests/mochitest/blacksilence.js @@ -0,0 +1,121 @@ +(function(global) { + 'use strict'; + + // an invertible check on the condition. + // if the constraint is applied, then the check is direct + // if not applied, then the result should be reversed + function check(constraintApplied, condition, message) { + var good = constraintApplied ? condition : !condition; + message = (constraintApplied ? 'with' : 'without') + + ' constraint: should ' + (constraintApplied ? '' : 'not ') + + message + ' = ' + (good ? 'OK' : 'waiting...'); + info(message); + return good; + } + + function mkElement(type) { + // This makes an unattached element. + // It's not rendered to save the cycles that costs on b2g emulator + // and it gets dropped (and GC'd) when the test is done. + var e = document.createElement(type); + e.width = 32; + e.height = 24; + document.getElementById('display').appendChild(e); + return e; + } + + // Runs checkFunc until it reports success. + // This is kludgy, but you have to wait for media to start flowing, and it + // can't be any old media, it has to include real data, for which we have no + // reliable signals to use as a trigger. + function periodicCheck(checkFunc) { + var resolve; + var done = false; + // This returns a function so that we create 10 closures in the loop, not + // one; and so that the timers don't all start straight away + var waitAndCheck = counter => () => { + if (done) { + return Promise.resolve(); + } + return new Promise(r => setTimeout(r, 200 << counter)) + .then(() => { + if (checkFunc()) { + done = true; + resolve(); + } + }); + }; + + var chain = Promise.resolve(); + for (var i = 0; i < 10; ++i) { + chain = chain.then(waitAndCheck(i)); + } + return new Promise(r => resolve = r); + } + + function isSilence(audioData) { + var silence = true; + for (var i = 0; i < audioData.length; ++i) { + if (audioData[i] !== 128) { + silence = false; + } + } + return silence; + } + + function checkAudio(constraintApplied, stream) { + var audio = mkElement('audio'); + audio.srcObject = stream; + audio.play(); + + var context = new AudioContext(); + var source = context.createMediaStreamSource(stream); + var analyser = context.createAnalyser(); + source.connect(analyser); + analyser.connect(context.destination); + + return periodicCheck(() => { + var sampleCount = analyser.frequencyBinCount; + info('got some audio samples: ' + sampleCount); + var buffer = new Uint8Array(sampleCount); + analyser.getByteTimeDomainData(buffer); + + var silent = check(constraintApplied, isSilence(buffer), + 'be silence for audio'); + return sampleCount > 0 && silent; + }).then(() => { + source.disconnect(); + analyser.disconnect(); + audio.pause(); + ok(true, 'audio is ' + (constraintApplied ? '' : 'not ') + 'silent'); + }); + } + + function checkVideo(constraintApplied, stream) { + var video = mkElement('video'); + video.srcObject = stream; + video.play(); + + return periodicCheck(() => { + try { + var canvas = mkElement('canvas'); + var ctx = canvas.getContext('2d'); + // Have to guard drawImage with the try as well, due to bug 879717. If + // we get an error, this round fails, but that failure is usually just + // transitory. + ctx.drawImage(video, 0, 0); + ctx.getImageData(0, 0, 1, 1); + return check(constraintApplied, false, 'throw on getImageData for video'); + } catch (e) { + return check(constraintApplied, e.name === 'SecurityError', + 'get a security error: ' + e.name); + } + }).then(() => { + video.pause(); + ok(true, 'video is ' + (constraintApplied ? '' : 'not ') + 'protected'); + }); + } + + global.audioIsSilence = checkAudio; + global.videoIsBlack = checkVideo; +}(this)); -- cgit v1.2.3