1 files changed, 96 insertions, 0 deletions
diff --git a/third_party/libwebrtc/moz-patch-stack/0020.patch b/third_party/libwebrtc/moz-patch-stack/0020.patch
new file mode 100644
index 0000000000..72b949b3c1
--- /dev/null
+++ b/third_party/libwebrtc/moz-patch-stack/0020.patch
@@ -0,0 +1,96 @@
+From: Dan Minor <dminor@mozilla.com>
+Date: Tue, 17 Sep 2019 06:47:00 +0000
+Subject: Bug 1581193 - Fix devicechange event on Windows; r=achronop
+
+This restores the code for generating devicechange events that was
+accidentally removed as part of updating the Windows video capture code
+in Bug 1552755.
+
+Differential Revision: https://phabricator.services.mozilla.com/D46033
+Mercurial Revision: https://hg.mozilla.org/mozilla-central/rev/840c4edafa021eeac6a7e6ae0e828d0adcfea92e
+---
+ .../video_capture/windows/device_info_ds.cc   | 39 +++++++++++++++++++
+ .../video_capture/windows/device_info_ds.h    |  3 ++
+ 2 files changed, 42 insertions(+)
+
+diff --git a/modules/video_capture/windows/device_info_ds.cc b/modules/video_capture/windows/device_info_ds.cc
+index fb8d55137f..8543dce746 100644
+--- a/modules/video_capture/windows/device_info_ds.cc
++++ b/modules/video_capture/windows/device_info_ds.cc
+@@ -20,6 +20,29 @@
+ namespace webrtc {
+ namespace videocapturemodule {
+ 
++LRESULT CALLBACK WndProc(HWND hWnd, UINT uiMsg, WPARAM wParam, LPARAM lParam)
++{
++    DeviceInfoDS* pParent;
++    if (uiMsg == WM_CREATE)
++    {
++        pParent = (DeviceInfoDS*)((LPCREATESTRUCT)lParam)->lpCreateParams;
++        SetWindowLongPtr(hWnd, GWLP_USERDATA, (LONG_PTR)pParent);
++    }
++    else if (uiMsg == WM_DESTROY)
++    {
++        SetWindowLongPtr(hWnd, GWLP_USERDATA, NULL);
++    }
++    else if (uiMsg == WM_DEVICECHANGE)
++    {
++        pParent = (DeviceInfoDS*)GetWindowLongPtr(hWnd, GWLP_USERDATA);
++        if (pParent)
++        {
++            pParent->DeviceChange();
++        }
++    }
++    return DefWindowProc(hWnd, uiMsg, wParam, lParam);
++}
++
+ // static
+ DeviceInfoDS* DeviceInfoDS::Create() {
+   DeviceInfoDS* dsInfo = new DeviceInfoDS();
+@@ -77,6 +100,18 @@ DeviceInfoDS::DeviceInfoDS()
+                         << rtc::ToHex(hr);
+     }
+   }
++
++  _hInstance = reinterpret_cast<HINSTANCE>(GetModuleHandle(NULL));
++  _wndClass = {0};
++  _wndClass.lpfnWndProc = &WndProc;
++  _wndClass.lpszClassName = TEXT("DeviceInfoDS");
++  _wndClass.hInstance = _hInstance;
++
++  if (RegisterClass(&_wndClass)) {
++    _hwnd = CreateWindow(_wndClass.lpszClassName, NULL, 0, CW_USEDEFAULT,
++                         CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL,
++                         NULL, _hInstance, this);
++  }
+ }
+ 
+ DeviceInfoDS::~DeviceInfoDS() {
+@@ -85,6 +120,10 @@ DeviceInfoDS::~DeviceInfoDS() {
+   if (_CoUninitializeIsRequired) {
+     CoUninitialize();
+   }
++  if (_hwnd != NULL) {
++    DestroyWindow(_hwnd);
++  }
++  UnregisterClass(_wndClass.lpszClassName, _hInstance);
+ }
+ 
+ int32_t DeviceInfoDS::Init() {
+diff --git a/modules/video_capture/windows/device_info_ds.h b/modules/video_capture/windows/device_info_ds.h
+index 1b52645cde..dc7b9b1a24 100644
+--- a/modules/video_capture/windows/device_info_ds.h
++++ b/modules/video_capture/windows/device_info_ds.h
+@@ -93,6 +93,9 @@ class DeviceInfoDS : public DeviceInfoImpl {
+   IEnumMoniker* _dsMonikerDevEnum;
+   bool _CoUninitializeIsRequired;
+   std::vector<VideoCaptureCapabilityWindows> _captureCapabilitiesWindows;
++  HWND _hwnd;
++  WNDCLASS _wndClass;
++  HINSTANCE _hInstance;
+ };
+ }  // namespace videocapturemodule
+ }  // namespace webrtc
+-- 
+2.34.1
+