946027 - MSE needs to expose the layer manager backend type to MP4Reader

Status: RESOLVED FIXED

(Core :: Audio/Video, defect)

Description

[Chris Pearce [:cpearce (Not reading bugmail)]]

The BufferDecoder that owns the MP4Reader doesn't return a MediaDecoderOwner in its GetOwner() implementation, so MP4Reader::InitLayersBackendType() fails to determine the backend type, so it can't initialize DXVA.

The same thing happens when WMFReader is used in MSE.

This means we don't get DXVA decoding, which makes the perf fairy is sad.

We need a way to expose to the decoder whether it's safe to use hardware accelerated decoding or not.

Testcase: http://people.mozilla.org/~ydelendik/mse/demo-mse4.html

Comment 1

[Matthew Gregan [:kinetik]]

Attachment: Expose subdecoder's owner to avoid breaking DXVA decoding in MSE.

Comment 2

[Matthew Gregan [:kinetik]]

I haven't actually tested this, but it's a simple change.  There's probably other stuff on the SubBufferDecoders that need to be forwarded too; they'll be fixed as necessary.

Comment 3

[Matthew Gregan [:kinetik]]

https://hg.mozilla.org/integration/mozilla-inbound/rev/dcbcab7596ae

Comment 4

[Carsten Book [:Tomcat]]

https://hg.mozilla.org/mozilla-central/rev/dcbcab7596ae