1062669 - During initial SourceBuffer creation, clearly demarcate which SBs require init data before running the parent ReadMetadata

Status: RESOLVED FIXED

(Core :: Audio/Video, defect)

Description

[Matthew Gregan [:kinetik]]

When the first SourceBuffer is created for a MediaSource, dispatch an event to the main thread to calculate which SourceBuffers have been added before the main thread reached a stable state.  Treat these decoders as the ones for which we must have the first init segment present before allowing MediaSourceReader::ReadMetadata to run; any SourceBuffers appended later would be initialized lazily and must then conform to the track configuration created by the initial SourceBuffers.

See also: https://dvcs.w3.org/hg/html-media/raw-file/default/media-source/media-source.html#sourcebuffer-init-segment-received

This depends on the changes in bug 1059058 (and potentially bug 1041396), and would be useful to implement before making MSE widely available to provide reliable/consistent behaviour.

Comment 1

[Matthew Gregan [:kinetik]]

Attachment: p1: v1

Comment 2

[Matthew Gregan [:kinetik]]

https://hg.mozilla.org/integration/mozilla-inbound/rev/2e6011266bea

Comment 3

[Ryan VanderMeulen [:RyanVM]]

https://hg.mozilla.org/mozilla-central/rev/2e6011266bea