refactor: offload mp4/ts probe to web worker #1117
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brandonocasey
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## main #1117 +/- ##
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+ Coverage 86.30% 86.40% +0.09%
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Files 38 39 +1
Lines 9072 9628 +556
Branches 2054 2176 +122
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+ Hits 7830 8319 +489
- Misses 1242 1309 +67
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| // start time. Meaning cached frame data may corrupt our notion of where this segment | ||
| // really starts. To get around this, full segment appends should probe for the info | ||
| // needed. | ||
| workerCallback({ |
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One thing I'm curious about is now that this is asynchronous, the trackInfo, audioStart, and videoStart functions may come from different places (either from the probe or from the transmuxer). Due to cached data in the transmuxer, I wonder if this could lead to some different behavior due to race conditions.
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We don't send anything to the transmuxer until the probe comes back, so I wouldn't think so.
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Missed that, you're right 👍
test/segment-loader.test.js
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| @@ -911,8 +936,7 @@ QUnit.module('SegmentLoader', function(hooks) { | |||
| this.clock.tick(1); | |||
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| // decryption tick for syncWorker | |||
| this.clock.tick(1); | |||
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| this.clock.tick(2); | |||
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Might be worth adding a comment for the extra tick
| } | ||
| transmuxer.removeEventListener('message', listenForEndEvent); | ||
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| // transfer ownership of bytes back to us. |
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Since the ownership is transferred here, do we need to transfer the ownership again in the media-segment-request users of workerCallback?
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We do for anywhere else the data is referenced.
Description
offloads ts / mp4 probing to the web worker saving us ~600 gzipped bytes.