1382978 - use HTTP OMT data delivery while loading media resource

Status: RESOLVED FIXED

(Core :: Audio/Video: Playback, enhancement, P3)

Description

[Shih-Chiang Chien [:schien] (UTC+8) (use ni? plz)]

From telemetry [1] I found that HTTP off-main-thread data delivery is not enabled while loading <video>/<audio>/<track> resource[2][3][4]. Might be able to reduce jank if we can deliver the data to decoder/parser thread directly without touching main thread.

HTML5 parser is a good example of enabling HTTP OMT [5].

[1] https://mzl.la/2ugBd0T
[2] https://searchfox.org/mozilla-central/rev/3a3af33f513071ea829debdfbc628caebcdf6996/dom/html/HTMLMediaElement.cpp#1175
[3] https://searchfox.org/mozilla-central/rev/3a3af33f513071ea829debdfbc628caebcdf6996/dom/media/MediaResource.cpp#861
[4] https://searchfox.org/mozilla-central/rev/3a3af33f513071ea829debdfbc628caebcdf6996/dom/html/HTMLTrackElement.cpp#330
[5] https://searchfox.org/mozilla-central/rev/3a3af33f513071ea829debdfbc628caebcdf6996/parser/html/nsHtml5StreamParser.cpp#973

Comment 1

[Shih-Chiang Chien [:schien] (UTC+8) (use ni? plz)]

From recent telemetry data it shows that both video and audio have switched to OMT successfully. Thanks @jwwang!
https://mzl.la/2kQBQvz
https://mzl.la/2kRVxD7

Comment 2

[JW Wang [:jwwang] [:jw_wang]]

All dependencies are resolved.