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d3d11desktopdup: Support desktop switches

Browse source 
Before creating output duplication interface, call SetThreadDesktop()
with HDESK of the current input desktop in case a desktop switch has
occurred.

This allows d3d11desktopdupsrc to capture Windows User Account Control
(UAC) prompts, which appear on a separate secure desktop. Otherwise
IDXGIOutput1::DuplicateOutput() will return E_ACCESSDENIED and the
element won't produce any frames as long as the UAC screen is active.

Note that in order to access secure desktop the application still has to
run at LOCAL_SYSTEM privileges. For GStreamer applications running with
regular user privileges this change has no effect.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/2209>
This commit is contained in:
Jakub Adam 2021-04-29 22:10:15 +02:00 committed by GStreamer Marge Bot
parent aac012ce72
commit fb8ed9e5d2
1 changed files with 11 additions and 0 deletions
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11
sys/d3d11/gstd3d11desktopdup.cpp
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@ -661,6 +661,17 @@ private:
return GST_FLOW_ERROR;
}
HDESK hdesk = OpenInputDesktop (0, FALSE, GENERIC_ALL);
if (hdesk) {
if (!SetThreadDesktop (hdesk)) {
GST_WARNING ("SetThreadDesktop() failed, error %lu", GetLastError());
}
CloseDesktop (hdesk);
} else {
GST_WARNING ("OpenInputDesktop() failed, error %lu", GetLastError());
}
/* FIXME: Use DuplicateOutput1 to avoid potentail color conversion */
hr = output1->DuplicateOutput(d3d11_device.Get(), &dupl_);
if (!gst_d3d11_result (hr, device)) {