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Fix math round when number > 2^52 on IE11 #832

Merged
merged 4 commits into from
Jun 2, 2017
Merged

Fix math round when number > 2^52 on IE11 #832

merged 4 commits into from
Jun 2, 2017

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itaykinnrot
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based on https://stackoverflow.com/questions/12830742/javascript-math-round-bug-in-ie
The issue is that the url that the dash utils provide sometimes wrong due to the Math.round on IE.
https://github.com/google/shaka-player/blob/master/lib/dash/mpd_utils.js#L101

TheModMaker
TheModMaker suggested changes May 31, 2017
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Interesting, I've never heard of this. But thanks for finding it and fixing it.

lib/polyfill/mathround.js Outdated
shaka.log.debug('mathRound.install');

var agent = navigator.userAgent;
if (agent && agent.indexOf('rv:11.0') >= 0) {
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It would be better to use feature detection instead of browser detection. How about:

if (Math.round(4503599627370497) != 4503599627370497) {
...
}

lib/polyfill/mathround.js Outdated
var original_mathRound = Math.round;
Math.round = function(number) {
var result = number;
// workaround for IE brain-dead Math.round() implementation
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Please be more politically correct:

// Workaround for a rounding bug in IE11.

lib/polyfill/mathround.js Outdated
// https://stackoverflow.com/questions/12830742/javascript-math-round-bug-in-ie
if (number < 4503599627370496) {
result = original_mathRound(number);
}
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Add a comment that includes why it doesn't need to be rounded. Something like "Otherwise, due to the precision of JavaScript numbers, the number must already be an integer."

shaka-player.uncompiled.js Outdated
@@ -49,5 +49,6 @@ goog.require('shaka.polyfill.MediaSource');
goog.require('shaka.polyfill.Promise');
goog.require('shaka.polyfill.VTTCue');
goog.require('shaka.polyfill.VideoPlaybackQuality');
goog.require('shaka.polyfill.MathRound');
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Alphabetize these calls.

joeyparrish
joeyparrish reviewed May 31, 2017
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lib/polyfill/mathround.js Outdated
var result = number;
// workaround for IE brain-dead Math.round() implementation
// https://stackoverflow.com/questions/12830742/javascript-math-round-bug-in-ie
if (number < 4503599627370496) {
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This constant would be more readable as 0x10000000000000, I think. Also, please move this to a static const. Something like:

/**

  • @const {number}
  • @Private
    */
    shaka.polyfill.MathRound.MAX_ACCURATE_INPUT_ = 0x10000000000000;

Finally, please be careful about < vs <=. From the stackoverflow thread, it appears that this constant does round correctly, so we should use the original for inputs <= the constant.

@TheModMaker TheModMaker mentioned this pull request May 31, 2017
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@joeyparrish joeyparrish added this to the v2.2.0 milestone May 31, 2017
@joeyparrish joeyparrish added type: bug Something isn't working correctly type: external An issue with an external dependency; not our issue; sometimes kept open for tracking labels May 31, 2017
@itaykinnrot
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@TheModMaker @joeyparrish Thanks for the review - fixed.

joeyparrish
joeyparrish approved these changes Jun 1, 2017
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Looks good to me. @TheModMaker, any feedback?

TheModMaker
TheModMaker approved these changes Jun 2, 2017
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LGTM. Let me run this through our build bot.

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All tests passed!

@TheModMaker TheModMaker merged commit f145dff into shaka-project:master Jun 2, 2017
joeyparrish pushed a commit that referenced this pull request Jun 5, 2017
@joeyparrish
Fix math round when number > 2^52 on IE11 (#832)
734ac9b 
Don't use math round on ie11 if number > 2^52.
@joeyparrish
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Cherry-picked to v2.1.3.

@avelad avelad mentioned this pull request Apr 11, 2022
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@github-actions github-actions bot added the status: archived Archived and locked; will not be updated label Jul 25, 2023
@github-actions github-actions bot locked as resolved and limited conversation to collaborators Jul 25, 2023
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status: archived Archived and locked; will not be updated type: bug Something isn't working correctly type: external An issue with an external dependency; not our issue; sometimes kept open for tracking
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@itaykinnrot @shaka-bot @joeyparrish @TheModMaker