2044501 - Make MediaCapabilities playback decodingInfo use PDMFactory::Supports to make responses cached for remote decoders, and gate on pref

Status: ASSIGNED

(Core :: Audio/Video, task)

Description

[Andreas Pehrson [:pehrsons] (PTO; back in Aug)]

This would make decodingInfo requests resolve much much quicker. But some testing may be warranted to ensure results are on par with creating a MediaDecoder and querying explicitly.

Use a pref to gate this so we can test the new mode without shipping it.

Comment 1

[Andreas Pehrson [:pehrsons] (PTO; back in Aug)]

Attachment: Bug 2044501 - Add RemoteMediaManagerChild::EnsureCodecSupportFor for async HW codec support queries.

Comment 2

[Andreas Pehrson [:pehrsons] (PTO; back in Aug)]

Attachment: Bug 2044501 - Add cached async codec-support path for MediaCapabilities decode behind a pref.

Add RemoteMediaManagerChild::EnsureCodecSupportFor-backed async support queries
(PDMFactory::SupportsAsync / PDMFactorySupport::IsSupportedAsync) and use them
for the non-WebRTC MediaCapabilities decode paths, gated by the new
media.mediacapabilities.codec-support-cache.enabled pref (default false). When
the pref is disabled the original behaviour is used: creating a decoder and
querying it for video, and a synchronous PDMFactorySupport query for audio.

Comment 3

[Andreas Pehrson [:pehrsons] (PTO; back in Aug)]

Attachment: Bug 2044501 - Add moz-WPT for new media-capabilities supports-cache pref. r?#media-playback-reviewers