Bug 198783 – [WinCairo][MediaFoundation] Stop using soft linking for Media Foundation

• Component: Platform
• Status: RESOLVED FIXED

[Fujii Hironori]

[WinCairo][MediaFoundation] Stop using soft linking for Media Foundation

WinCairo is supporting Windows 7 or newer. It doen't need soft linking anymore.

Bug 141905 – [WinCairo] WinLauncher is not starting on Vista.
Bug 144890 – [Win] Move Windows build target to Windows 7 (or newer)

[Per Arne Vollan]

Isn't soft linking also a performance improvement, since you only load the dll's when you need to?

[Fujii Hironori]

I checked Firefox and Chrome by using listdlls.
It seems that firefox.exe and chrome.exe loaded Direct3D, dxva2.dll, mf.dll and mfplat.dll just by start up the browsers.

I'd like to change the call site of MFStartup and MFShutdown to fix Bug 198281.
Then, mfplat.dll will be loaded always.

[Fujii Hironori]

Firefox is using soft linking.
https://dxr.mozilla.org/mozilla-central/source/dom/media/platforms/wmf/WMFUtils.cpp

Chromium is calling API directly, for example MFStartup and MFCreateMediaType.
You can search them by https://cs.chromium.org/

[Fujii Hironori]

Chromium is using /DELAYLOAD.

>     ldflags += [
> 	      "/DELAYLOAD:d3d9.dll",
> 	      "/DELAYLOAD:d3d11.dll",
> 	      "/DELAYLOAD:dxva2.dll",
> 	      "/DELAYLOAD:mf.dll",
> 	      "/DELAYLOAD:mfplat.dll",
> 	      ]

https://chromium.googlesource.com/chromium/src/+/HEAD/media/gpu/BUILD.gn#213

[Fujii Hironori]

Created attachment 372096 [details]
WinCairo WK1 MiniBrowser start up log

WinCairo MiniBrowser.exe also loads mf.dll just by stating up.

[Fujii Hironori]

Created attachment 372906 [details]
Patch

[EWS Watchlist]

Comment on attachment 372906 [details]
Patch

Attachment 372906 [details] did not pass win-ews (win):
Output: https://webkit-queues.webkit.org/results/12579200

New failing tests:
storage/indexeddb/index-cursor.html

[EWS Watchlist]

Created attachment 372917 [details]
Archive of layout-test-results from ews211 for win-future

The attached test failures were seen while running run-webkit-tests on the win-ews.
Bot: ews211  Port: win-future  Platform: CYGWIN_NT-10.0-17763-3.0.5-338.x86_64-x86_64-64bit

[Fujii Hironori]

Comment on attachment 372906 [details]
Patch

Clearing flags on attachment: 372906

Committed r246918: <https://trac.webkit.org/changeset/246918>

[Fujii Hironori]

All reviewed patches have been landed.  Closing bug.

[Radar WebKit Bug Importer]

<rdar://problem/52301843>

[Fujii Hironori]

Committed r246919: <https://trac.webkit.org/changeset/246919>

[Fujii Hironori]

(In reply to Fujii Hironori from comment #4)
> Chromium is using /DELAYLOAD.

Filed: Bug 213330 – [WinCairo][MediaFoundation] Use /DELAYLOAD for mf.dll