wgc dll test pass

demo/main.cpp

@@ -97,9 +97,9 @@ int CALLBACK WinMain(HINSTANCE instance, HINSTANCE previousInstance,
   WINRT_VERIFY(comboBoxHwnd);
 
   // Populate combo box
-  for (auto &window : g_windows) {
-    SendMessage(comboBoxHwnd, CB_ADDSTRING, 0, (LPARAM)window.Title().c_str());
-  }
+  // for (auto &window : g_windows) {
+  //   SendMessage(comboBoxHwnd, CB_ADDSTRING, 0, (LPARAM)window.Title().c_str());
+  // }
 
   for (auto &monitor : g_monitors) {
     SendMessage(comboBoxHwnd, CB_ADDSTRING, 0,
@@ -141,13 +141,14 @@ LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) {
     case WM_COMMAND:
       if (HIWORD(wParam) == CBN_SELCHANGE) {
         auto index = SendMessage((HWND)lParam, CB_GETCURSEL, 0, 0);
-      if (index < g_windows.size() - 1) {
-        auto window = g_windows[index];
-        g_app->StartCapture(window.Hwnd());
-      } else {
-        auto monitor = g_monitors[index - g_windows.size()];
+        // if (index < g_windows.size() - 1) {
+        //   auto window = g_windows[index];
+        //   g_app->StartCapture(window.Hwnd());
+        // } else {
+          // auto monitor = g_monitors[index - g_windows.size()];
+          auto monitor = g_monitors[0];
           g_app->StartCapture(monitor.Hmonitor());
-      }
+        // }
       }
       break;
     default:

dll/main.cpp

@@ -0,0 +1,34 @@
+
+#define AMRECORDER_IMPORT
+#include <iostream>
+
+#include "export.h"
+#include "head.h"
+#include "record_desktop_wgc.h"
+
+int main() {
+  // bool is_supported = wgc_is_supported();
+  // if (!wgc_is_supported) {
+  //   std::cout << "Not support wgc" << std::endl;
+  //   return -1;
+  // }
+
+  static am::record_desktop *recorder = new am::record_desktop_wgc();
+
+	RECORD_DESKTOP_RECT rect;
+	rect.left = 0;
+	rect.top = 0;
+	rect.right = GetSystemMetrics(SM_CXSCREEN);
+	rect.bottom = GetSystemMetrics(SM_CYSCREEN);
+
+  recorder->init(rect, 10);
+
+  recorder->start();
+  // int pause() override;
+  // int resume() override;
+  // int stop() override;
+
+  while(1){}
+
+  return 0;
+}

dll/record_desktop_wgc.cpp

@@ -1,18 +1,21 @@
 #include "record_desktop_wgc.h"
 
+#include "utils_string.h"
+
+#include "system_error.h"
 #include "error_define.h"
 #include "log_helper.h"
-#include "system_error.h"
-#include "utils_string.h"
 
 BOOL WINAPI EnumMonitorProc(HMONITOR hmonitor, HDC hdc, LPRECT lprc,
                             LPARAM data) {
+
   MONITORINFOEX info_ex;
   info_ex.cbSize = sizeof(MONITORINFOEX);
 
   GetMonitorInfo(hmonitor, &info_ex);
 
-  if (info_ex.dwFlags == DISPLAY_DEVICE_MIRRORING_DRIVER) return true;
+  if (info_ex.dwFlags == DISPLAY_DEVICE_MIRRORING_DRIVER)
+    return true;
 
   if (info_ex.dwFlags & MONITORINFOF_PRIMARY) {
     *(HMONITOR *)data = hmonitor;
@@ -31,6 +34,7 @@ HMONITOR GetPrimaryMonitor() {
 
 namespace am {
 
+
 record_desktop_wgc::record_desktop_wgc() {}
 
 record_desktop_wgc::~record_desktop_wgc() {
@@ -40,7 +44,8 @@ record_desktop_wgc::~record_desktop_wgc() {
 
 int record_desktop_wgc::init(const RECORD_DESKTOP_RECT &rect, const int fps) {
   int error = AE_NO;
-  if (_inited == true) return error;
+  if (_inited == true)
+    return error;
 
   _fps = fps;
   _rect = rect;
@@ -49,12 +54,12 @@ int record_desktop_wgc::init(const RECORD_DESKTOP_RECT &rect, const int fps) {
   _pixel_fmt = AV_PIX_FMT_BGRA;
 
   do {
-    if (!module_.is_supported()) {
+    if (!wgc_is_supported()) {
       error = AE_UNSUPPORT;
       break;
     }
 
-    session_ = module_.create_session();
+    session_ = wgc_create_session();
     if (!session_) {
       error = AE_WGC_CREATE_CAPTURER_FAILED;
       break;
@@ -93,20 +98,23 @@ int record_desktop_wgc::start() {
 
 int record_desktop_wgc::pause() {
   _paused = true;
-  if (session_) session_->pause();
+  if (session_)
+    session_->pause();
   return AE_NO;
 }
 
 int record_desktop_wgc::resume() {
   _paused = false;
-  if (session_) session_->resume();
+  if (session_)
+    session_->resume();
   return AE_NO;
 }
 
 int record_desktop_wgc::stop() {
   _running = false;
 
-  if (session_) session_->stop();
+  if (session_)
+    session_->stop();
 
   return AE_NO;
 }
@@ -128,7 +136,8 @@ void record_desktop_wgc::on_frame(const wgc_session::wgc_session_frame &frame) {
   av_image_fill_arrays(av_frame->data, av_frame->linesize, frame.data,
                        AV_PIX_FMT_BGRA, frame.width, frame.height, 1);
 
-  if (_on_data) _on_data(av_frame);
+  if (_on_data)
+    _on_data(av_frame);
 
   av_frame_free(&av_frame);
 }
@@ -136,7 +145,8 @@ void record_desktop_wgc::on_frame(const wgc_session::wgc_session_frame &frame) {
 void record_desktop_wgc::clean_up() {
   _inited = false;
 
-  if (session_) session_->release();
+  if (session_)
+    session_->release();
 
   session_ = nullptr;
 }

main.cpp

@@ -1,17 +0,0 @@
-
-#define AMRECORDER_IMPORT
-#include <iostream>
-
-#include "export.h"
-#include "head.h"
-
-int main() {
-  bool is_supported = wgc_is_supported();
-  if (!wgc_is_supported) {
-    std::cout << "Not support wgc" << std::endl;
-    return -1;
-  }
-
-  rd rd;
-  return 0;
-}

webrtc/wgc_capture_session.cc

@@ -0,0 +1,372 @@
+/*
+ *  Copyright (c) 2020 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "modules/desktop_capture/win/wgc_capture_session.h"
+
+#include <windows.graphics.capture.interop.h>
+#include <windows.graphics.directX.direct3d11.interop.h>
+#include <wrl.h>
+
+#include <memory>
+#include <utility>
+#include <vector>
+
+#include "modules/desktop_capture/win/wgc_desktop_frame.h"
+#include "rtc_base/checks.h"
+#include "rtc_base/logging.h"
+#include "rtc_base/time_utils.h"
+#include "rtc_base/win/create_direct3d_device.h"
+#include "rtc_base/win/get_activation_factory.h"
+#include "system_wrappers/include/metrics.h"
+
+using Microsoft::WRL::ComPtr;
+namespace WGC = ABI::Windows::Graphics::Capture;
+
+namespace webrtc {
+namespace {
+
+// We must use a BGRA pixel format that has 4 bytes per pixel, as required by
+// the DesktopFrame interface.
+const auto kPixelFormat = ABI::Windows::Graphics::DirectX::DirectXPixelFormat::
+    DirectXPixelFormat_B8G8R8A8UIntNormalized;
+
+// We only want 1 buffer in our frame pool to reduce latency. If we had more,
+// they would sit in the pool for longer and be stale by the time we are asked
+// for a new frame.
+const int kNumBuffers = 1;
+
+// These values are persisted to logs. Entries should not be renumbered and
+// numeric values should never be reused.
+enum class StartCaptureResult {
+  kSuccess = 0,
+  kSourceClosed = 1,
+  kAddClosedFailed = 2,
+  kDxgiDeviceCastFailed = 3,
+  kD3dDelayLoadFailed = 4,
+  kD3dDeviceCreationFailed = 5,
+  kFramePoolActivationFailed = 6,
+  kFramePoolCastFailed = 7,
+  kGetItemSizeFailed = 8,
+  kCreateFreeThreadedFailed = 9,
+  kCreateCaptureSessionFailed = 10,
+  kStartCaptureFailed = 11,
+  kMaxValue = kStartCaptureFailed
+};
+
+// These values are persisted to logs. Entries should not be renumbered and
+// numeric values should never be reused.
+enum class GetFrameResult {
+  kSuccess = 0,
+  kItemClosed = 1,
+  kTryGetNextFrameFailed = 2,
+  kFrameDropped = 3,
+  kGetSurfaceFailed = 4,
+  kDxgiInterfaceAccessFailed = 5,
+  kTexture2dCastFailed = 6,
+  kCreateMappedTextureFailed = 7,
+  kMapFrameFailed = 8,
+  kGetContentSizeFailed = 9,
+  kResizeMappedTextureFailed = 10,
+  kRecreateFramePoolFailed = 11,
+  kMaxValue = kRecreateFramePoolFailed
+};
+
+void RecordStartCaptureResult(StartCaptureResult error) {
+  RTC_HISTOGRAM_ENUMERATION(
+      "WebRTC.DesktopCapture.Win.WgcCaptureSessionStartResult",
+      static_cast<int>(error), static_cast<int>(StartCaptureResult::kMaxValue));
+}
+
+void RecordGetFrameResult(GetFrameResult error) {
+  RTC_HISTOGRAM_ENUMERATION(
+      "WebRTC.DesktopCapture.Win.WgcCaptureSessionGetFrameResult",
+      static_cast<int>(error), static_cast<int>(GetFrameResult::kMaxValue));
+}
+
+}  // namespace
+
+WgcCaptureSession::WgcCaptureSession(ComPtr<ID3D11Device> d3d11_device,
+                                     ComPtr<WGC::IGraphicsCaptureItem> item)
+    : d3d11_device_(std::move(d3d11_device)), item_(std::move(item)) {}
+WgcCaptureSession::~WgcCaptureSession() = default;
+
+HRESULT WgcCaptureSession::StartCapture() {
+  RTC_DCHECK_RUN_ON(&sequence_checker_);
+  RTC_DCHECK(!is_capture_started_);
+
+  if (item_closed_) {
+    RTC_LOG(LS_ERROR) << "The target source has been closed.";
+    RecordStartCaptureResult(StartCaptureResult::kSourceClosed);
+    return E_ABORT;
+  }
+
+  RTC_DCHECK(d3d11_device_);
+  RTC_DCHECK(item_);
+
+  // Listen for the Closed event, to detect if the source we are capturing is
+  // closed (e.g. application window is closed or monitor is disconnected). If
+  // it is, we should abort the capture.
+  auto closed_handler =
+      Microsoft::WRL::Callback<ABI::Windows::Foundation::ITypedEventHandler<
+          WGC::GraphicsCaptureItem*, IInspectable*>>(
+          this, &WgcCaptureSession::OnItemClosed);
+  EventRegistrationToken item_closed_token;
+  HRESULT hr = item_->add_Closed(closed_handler.Get(), &item_closed_token);
+  if (FAILED(hr)) {
+    RecordStartCaptureResult(StartCaptureResult::kAddClosedFailed);
+    return hr;
+  }
+
+  ComPtr<IDXGIDevice> dxgi_device;
+  hr = d3d11_device_->QueryInterface(IID_PPV_ARGS(&dxgi_device));
+  if (FAILED(hr)) {
+    RecordStartCaptureResult(StartCaptureResult::kDxgiDeviceCastFailed);
+    return hr;
+  }
+
+  if (!ResolveCoreWinRTDirect3DDelayload()) {
+    RecordStartCaptureResult(StartCaptureResult::kD3dDelayLoadFailed);
+    return E_FAIL;
+  }
+
+  hr = CreateDirect3DDeviceFromDXGIDevice(dxgi_device.Get(), &direct3d_device_);
+  if (FAILED(hr)) {
+    RecordStartCaptureResult(StartCaptureResult::kD3dDeviceCreationFailed);
+    return hr;
+  }
+
+  ComPtr<WGC::IDirect3D11CaptureFramePoolStatics> frame_pool_statics;
+  hr = GetActivationFactory<
+      ABI::Windows::Graphics::Capture::IDirect3D11CaptureFramePoolStatics,
+      RuntimeClass_Windows_Graphics_Capture_Direct3D11CaptureFramePool>(
+      &frame_pool_statics);
+  if (FAILED(hr)) {
+    RecordStartCaptureResult(StartCaptureResult::kFramePoolActivationFailed);
+    return hr;
+  }
+
+  // Cast to FramePoolStatics2 so we can use CreateFreeThreaded and avoid the
+  // need to have a DispatcherQueue. We don't listen for the FrameArrived event,
+  // so there's no difference.
+  ComPtr<WGC::IDirect3D11CaptureFramePoolStatics2> frame_pool_statics2;
+  hr = frame_pool_statics->QueryInterface(IID_PPV_ARGS(&frame_pool_statics2));
+  if (FAILED(hr)) {
+    RecordStartCaptureResult(StartCaptureResult::kFramePoolCastFailed);
+    return hr;
+  }
+
+  ABI::Windows::Graphics::SizeInt32 item_size;
+  hr = item_.Get()->get_Size(&item_size);
+  if (FAILED(hr)) {
+    RecordStartCaptureResult(StartCaptureResult::kGetItemSizeFailed);
+    return hr;
+  }
+
+  previous_size_ = item_size;
+
+  hr = frame_pool_statics2->CreateFreeThreaded(direct3d_device_.Get(),
+                                               kPixelFormat, kNumBuffers,
+                                               item_size, &frame_pool_);
+  if (FAILED(hr)) {
+    RecordStartCaptureResult(StartCaptureResult::kCreateFreeThreadedFailed);
+    return hr;
+  }
+
+  hr = frame_pool_->CreateCaptureSession(item_.Get(), &session_);
+  if (FAILED(hr)) {
+    RecordStartCaptureResult(StartCaptureResult::kCreateCaptureSessionFailed);
+    return hr;
+  }
+
+  hr = session_->StartCapture();
+  if (FAILED(hr)) {
+    RTC_LOG(LS_ERROR) << "Failed to start CaptureSession: " << hr;
+    RecordStartCaptureResult(StartCaptureResult::kStartCaptureFailed);
+    return hr;
+  }
+
+  RecordStartCaptureResult(StartCaptureResult::kSuccess);
+
+  is_capture_started_ = true;
+  return hr;
+}
+
+HRESULT WgcCaptureSession::GetFrame(
+    std::unique_ptr<DesktopFrame>* output_frame) {
+  RTC_DCHECK_RUN_ON(&sequence_checker_);
+
+  if (item_closed_) {
+    RTC_LOG(LS_ERROR) << "The target source has been closed.";
+    RecordGetFrameResult(GetFrameResult::kItemClosed);
+    return E_ABORT;
+  }
+
+  RTC_DCHECK(is_capture_started_);
+
+  ComPtr<WGC::IDirect3D11CaptureFrame> capture_frame;
+  HRESULT hr = frame_pool_->TryGetNextFrame(&capture_frame);
+  if (FAILED(hr)) {
+    RTC_LOG(LS_ERROR) << "TryGetNextFrame failed: " << hr;
+    RecordGetFrameResult(GetFrameResult::kTryGetNextFrameFailed);
+    return hr;
+  }
+
+  if (!capture_frame) {
+    RecordGetFrameResult(GetFrameResult::kFrameDropped);
+    return hr;
+  }
+
+  // We need to get this CaptureFrame as an ID3D11Texture2D so that we can get
+  // the raw image data in the format required by the DesktopFrame interface.
+  ComPtr<ABI::Windows::Graphics::DirectX::Direct3D11::IDirect3DSurface>
+      d3d_surface;
+  hr = capture_frame->get_Surface(&d3d_surface);
+  if (FAILED(hr)) {
+    RecordGetFrameResult(GetFrameResult::kGetSurfaceFailed);
+    return hr;
+  }
+
+  ComPtr<Windows::Graphics::DirectX::Direct3D11::IDirect3DDxgiInterfaceAccess>
+      direct3DDxgiInterfaceAccess;
+  hr = d3d_surface->QueryInterface(IID_PPV_ARGS(&direct3DDxgiInterfaceAccess));
+  if (FAILED(hr)) {
+    RecordGetFrameResult(GetFrameResult::kDxgiInterfaceAccessFailed);
+    return hr;
+  }
+
+  ComPtr<ID3D11Texture2D> texture_2D;
+  hr = direct3DDxgiInterfaceAccess->GetInterface(IID_PPV_ARGS(&texture_2D));
+  if (FAILED(hr)) {
+    RecordGetFrameResult(GetFrameResult::kTexture2dCastFailed);
+    return hr;
+  }
+
+  if (!mapped_texture_) {
+    hr = CreateMappedTexture(texture_2D);
+    if (FAILED(hr)) {
+      RecordGetFrameResult(GetFrameResult::kCreateMappedTextureFailed);
+      return hr;
+    }
+  }
+
+  // We need to copy |texture_2D| into |mapped_texture_| as the latter has the
+  // D3D11_CPU_ACCESS_READ flag set, which lets us access the image data.
+  // Otherwise it would only be readable by the GPU.
+  ComPtr<ID3D11DeviceContext> d3d_context;
+  d3d11_device_->GetImmediateContext(&d3d_context);
+  d3d_context->CopyResource(mapped_texture_.Get(), texture_2D.Get());
+
+  D3D11_MAPPED_SUBRESOURCE map_info;
+  hr = d3d_context->Map(mapped_texture_.Get(), /*subresource_index=*/0,
+                        D3D11_MAP_READ, /*D3D11_MAP_FLAG_DO_NOT_WAIT=*/0,
+                        &map_info);
+  if (FAILED(hr)) {
+    RecordGetFrameResult(GetFrameResult::kMapFrameFailed);
+    return hr;
+  }
+
+  ABI::Windows::Graphics::SizeInt32 new_size;
+  hr = capture_frame->get_ContentSize(&new_size);
+  if (FAILED(hr)) {
+    RecordGetFrameResult(GetFrameResult::kGetContentSizeFailed);
+    return hr;
+  }
+
+  // If the size has changed since the last capture, we must be sure to use
+  // the smaller dimensions. Otherwise we might overrun our buffer, or
+  // read stale data from the last frame.
+  int image_height = std::min(previous_size_.Height, new_size.Height);
+  int image_width = std::min(previous_size_.Width, new_size.Width);
+  int row_data_length = image_width * DesktopFrame::kBytesPerPixel;
+
+  // Make a copy of the data pointed to by |map_info.pData| so we are free to
+  // unmap our texture.
+  uint8_t* src_data = static_cast<uint8_t*>(map_info.pData);
+  std::vector<uint8_t> image_data;
+  image_data.reserve(image_height * row_data_length);
+  uint8_t* image_data_ptr = image_data.data();
+  for (int i = 0; i < image_height; i++) {
+    memcpy(image_data_ptr, src_data, row_data_length);
+    image_data_ptr += row_data_length;
+    src_data += map_info.RowPitch;
+  }
+
+  // Transfer ownership of |image_data| to the output_frame.
+  DesktopSize size(image_width, image_height);
+  *output_frame = std::make_unique<WgcDesktopFrame>(size, row_data_length,
+                                                    std::move(image_data));
+
+  d3d_context->Unmap(mapped_texture_.Get(), 0);
+
+  // If the size changed, we must resize the texture and frame pool to fit the
+  // new size.
+  if (previous_size_.Height != new_size.Height ||
+      previous_size_.Width != new_size.Width) {
+    hr = CreateMappedTexture(texture_2D, new_size.Width, new_size.Height);
+    if (FAILED(hr)) {
+      RecordGetFrameResult(GetFrameResult::kResizeMappedTextureFailed);
+      return hr;
+    }
+
+    hr = frame_pool_->Recreate(direct3d_device_.Get(), kPixelFormat,
+                               kNumBuffers, new_size);
+    if (FAILED(hr)) {
+      RecordGetFrameResult(GetFrameResult::kRecreateFramePoolFailed);
+      return hr;
+    }
+  }
+
+  RecordGetFrameResult(GetFrameResult::kSuccess);
+
+  previous_size_ = new_size;
+  return hr;
+}
+
+HRESULT WgcCaptureSession::CreateMappedTexture(
+    ComPtr<ID3D11Texture2D> src_texture,
+    UINT width,
+    UINT height) {
+  RTC_DCHECK_RUN_ON(&sequence_checker_);
+
+  D3D11_TEXTURE2D_DESC src_desc;
+  src_texture->GetDesc(&src_desc);
+  D3D11_TEXTURE2D_DESC map_desc;
+  map_desc.Width = width == 0 ? src_desc.Width : width;
+  map_desc.Height = height == 0 ? src_desc.Height : height;
+  map_desc.MipLevels = src_desc.MipLevels;
+  map_desc.ArraySize = src_desc.ArraySize;
+  map_desc.Format = src_desc.Format;
+  map_desc.SampleDesc = src_desc.SampleDesc;
+  map_desc.Usage = D3D11_USAGE_STAGING;
+  map_desc.BindFlags = 0;
+  map_desc.CPUAccessFlags = D3D11_CPU_ACCESS_READ;
+  map_desc.MiscFlags = 0;
+  return d3d11_device_->CreateTexture2D(&map_desc, nullptr, &mapped_texture_);
+}
+
+HRESULT WgcCaptureSession::OnItemClosed(WGC::IGraphicsCaptureItem* sender,
+                                        IInspectable* event_args) {
+  RTC_DCHECK_RUN_ON(&sequence_checker_);
+
+  RTC_LOG(LS_INFO) << "Capture target has been closed.";
+  item_closed_ = true;
+  is_capture_started_ = false;
+
+  mapped_texture_ = nullptr;
+  session_ = nullptr;
+  frame_pool_ = nullptr;
+  direct3d_device_ = nullptr;
+  item_ = nullptr;
+  d3d11_device_ = nullptr;
+
+  return S_OK;
+}
+
+}  // namespace webrtc

webrtc/wgc_capture_session.h

@@ -0,0 +1,110 @@
+/*
+ *  Copyright (c) 2020 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef MODULES_DESKTOP_CAPTURE_WIN_WGC_CAPTURE_SESSION_H_
+#define MODULES_DESKTOP_CAPTURE_WIN_WGC_CAPTURE_SESSION_H_
+
+#include <d3d11.h>
+#include <windows.graphics.capture.h>
+#include <wrl/client.h>
+
+#include <memory>
+
+#include "api/sequence_checker.h"
+#include "modules/desktop_capture/desktop_capture_options.h"
+#include "modules/desktop_capture/win/wgc_capture_source.h"
+
+namespace webrtc {
+
+class WgcCaptureSession final {
+ public:
+  WgcCaptureSession(
+      Microsoft::WRL::ComPtr<ID3D11Device> d3d11_device,
+      Microsoft::WRL::ComPtr<
+          ABI::Windows::Graphics::Capture::IGraphicsCaptureItem> item);
+
+  // Disallow copy and assign.
+  WgcCaptureSession(const WgcCaptureSession&) = delete;
+  WgcCaptureSession& operator=(const WgcCaptureSession&) = delete;
+
+  ~WgcCaptureSession();
+
+  HRESULT StartCapture();
+
+  // Returns a frame from the frame pool, if any are present.
+  HRESULT GetFrame(std::unique_ptr<DesktopFrame>* output_frame);
+
+  bool IsCaptureStarted() const {
+    RTC_DCHECK_RUN_ON(&sequence_checker_);
+    return is_capture_started_;
+  }
+
+ private:
+  // Initializes |mapped_texture_| with the properties of the |src_texture|,
+  // overrides the values of some necessary properties like the
+  // D3D11_CPU_ACCESS_READ flag. Also has optional parameters for what size
+  // |mapped_texture_| should be, if they aren't provided we will use the size
+  // of |src_texture|.
+  HRESULT CreateMappedTexture(
+      Microsoft::WRL::ComPtr<ID3D11Texture2D> src_texture,
+      UINT width = 0,
+      UINT height = 0);
+
+  // Event handler for |item_|'s Closed event.
+  HRESULT OnItemClosed(
+      ABI::Windows::Graphics::Capture::IGraphicsCaptureItem* sender,
+      IInspectable* event_args);
+
+  // A Direct3D11 Device provided by the caller. We use this to create an
+  // IDirect3DDevice, and also to create textures that will hold the image data.
+  Microsoft::WRL::ComPtr<ID3D11Device> d3d11_device_;
+
+  // This item represents what we are capturing, we use it to create the
+  // capture session, and also to listen for the Closed event.
+  Microsoft::WRL::ComPtr<ABI::Windows::Graphics::Capture::IGraphicsCaptureItem>
+      item_;
+
+  // The IDirect3DDevice is necessary to instantiate the frame pool.
+  Microsoft::WRL::ComPtr<
+      ABI::Windows::Graphics::DirectX::Direct3D11::IDirect3DDevice>
+      direct3d_device_;
+
+  // The frame pool is where frames are deposited during capture, we retrieve
+  // them from here with TryGetNextFrame().
+  Microsoft::WRL::ComPtr<
+      ABI::Windows::Graphics::Capture::IDirect3D11CaptureFramePool>
+      frame_pool_;
+
+  // This texture holds the final image data. We made it a member so we can
+  // reuse it, instead of having to create a new texture every time we grab a
+  // frame.
+  Microsoft::WRL::ComPtr<ID3D11Texture2D> mapped_texture_;
+
+  // This lets us know when the source has been resized, which is important
+  // because we must resize the framepool and our texture to be able to hold
+  // enough data for the frame.
+  ABI::Windows::Graphics::SizeInt32 previous_size_;
+
+  // The capture session lets us set properties about the capture before it
+  // starts such as whether to capture the mouse cursor, and it lets us tell WGC
+  // to start capturing frames.
+  Microsoft::WRL::ComPtr<
+      ABI::Windows::Graphics::Capture::IGraphicsCaptureSession>
+      session_;
+
+  bool item_closed_ = false;
+  bool is_capture_started_ = false;
+
+  SequenceChecker sequence_checker_;
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_DESKTOP_CAPTURE_WIN_WGC_CAPTURE_SESSION_H_

webrtc/wgc_capture_source.cc

@@ -0,0 +1,136 @@
+/*
+ *  Copyright (c) 2020 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+#include "modules/desktop_capture/win/wgc_capture_source.h"
+#include <windows.graphics.capture.interop.h>
+#include <windows.h>
+#include <utility>
+#include "modules/desktop_capture/win/screen_capture_utils.h"
+#include "modules/desktop_capture/win/window_capture_utils.h"
+#include "rtc_base/win/get_activation_factory.h"
+using Microsoft::WRL::ComPtr;
+namespace WGC = ABI::Windows::Graphics::Capture;
+namespace webrtc {
+WgcCaptureSource::WgcCaptureSource(DesktopCapturer::SourceId source_id)
+    : source_id_(source_id) {}
+WgcCaptureSource::~WgcCaptureSource() = default;
+bool WgcCaptureSource::IsCapturable() {
+  // If we can create a capture item, then we can capture it. Unfortunately,
+  // we can't cache this item because it may be created in a different COM
+  // apartment than where capture will eventually start from.
+  ComPtr<WGC::IGraphicsCaptureItem> item;
+  return SUCCEEDED(CreateCaptureItem(&item));
+}
+bool WgcCaptureSource::FocusOnSource() {
+  return false;
+}
+HRESULT WgcCaptureSource::GetCaptureItem(
+    ComPtr<WGC::IGraphicsCaptureItem>* result) {
+  HRESULT hr = S_OK;
+  if (!item_)
+    hr = CreateCaptureItem(&item_);
+  *result = item_;
+  return hr;
+}
+WgcCaptureSourceFactory::~WgcCaptureSourceFactory() = default;
+WgcWindowSourceFactory::WgcWindowSourceFactory() = default;
+WgcWindowSourceFactory::~WgcWindowSourceFactory() = default;
+std::unique_ptr<WgcCaptureSource> WgcWindowSourceFactory::CreateCaptureSource(
+    DesktopCapturer::SourceId source_id) {
+  return std::make_unique<WgcWindowSource>(source_id);
+}
+WgcScreenSourceFactory::WgcScreenSourceFactory() = default;
+WgcScreenSourceFactory::~WgcScreenSourceFactory() = default;
+std::unique_ptr<WgcCaptureSource> WgcScreenSourceFactory::CreateCaptureSource(
+    DesktopCapturer::SourceId source_id) {
+  return std::make_unique<WgcScreenSource>(source_id);
+}
+WgcWindowSource::WgcWindowSource(DesktopCapturer::SourceId source_id)
+    : WgcCaptureSource(source_id) {}
+WgcWindowSource::~WgcWindowSource() = default;
+DesktopVector WgcWindowSource::GetTopLeft() {
+  DesktopRect window_rect;
+  if (!GetWindowRect(reinterpret_cast<HWND>(GetSourceId()), &window_rect))
+    return DesktopVector();
+  return window_rect.top_left();
+}
+bool WgcWindowSource::IsCapturable() {
+  if (!IsWindowValidAndVisible(reinterpret_cast<HWND>(GetSourceId())))
+    return false;
+  return WgcCaptureSource::IsCapturable();
+}
+bool WgcWindowSource::FocusOnSource() {
+  if (!IsWindowValidAndVisible(reinterpret_cast<HWND>(GetSourceId())))
+    return false;
+  return ::BringWindowToTop(reinterpret_cast<HWND>(GetSourceId())) &&
+         ::SetForegroundWindow(reinterpret_cast<HWND>(GetSourceId()));
+}
+HRESULT WgcWindowSource::CreateCaptureItem(
+    ComPtr<WGC::IGraphicsCaptureItem>* result) {
+  if (!ResolveCoreWinRTDelayload())
+    return E_FAIL;
+  ComPtr<IGraphicsCaptureItemInterop> interop;
+  HRESULT hr = GetActivationFactory<
+      IGraphicsCaptureItemInterop,
+      RuntimeClass_Windows_Graphics_Capture_GraphicsCaptureItem>(&interop);
+  if (FAILED(hr))
+    return hr;
+  ComPtr<WGC::IGraphicsCaptureItem> item;
+  hr = interop->CreateForWindow(reinterpret_cast<HWND>(GetSourceId()),
+                                IID_PPV_ARGS(&item));
+  if (FAILED(hr))
+    return hr;
+  if (!item)
+    return E_HANDLE;
+  *result = std::move(item);
+  return hr;
+}
+WgcScreenSource::WgcScreenSource(DesktopCapturer::SourceId source_id)
+    : WgcCaptureSource(source_id) {
+  // Getting the HMONITOR could fail if the source_id is invalid. In that case,
+  // we leave hmonitor_ uninitialized and |IsCapturable()| will fail.
+  HMONITOR hmon;
+  if (GetHmonitorFromDeviceIndex(GetSourceId(), &hmon))
+    hmonitor_ = hmon;
+}
+WgcScreenSource::~WgcScreenSource() = default;
+DesktopVector WgcScreenSource::GetTopLeft() {
+  if (!hmonitor_)
+    return DesktopVector();
+  return GetMonitorRect(*hmonitor_).top_left();
+}
+bool WgcScreenSource::IsCapturable() {
+  if (!hmonitor_)
+    return false;
+  if (!IsMonitorValid(*hmonitor_))
+    return false;
+  return WgcCaptureSource::IsCapturable();
+}
+HRESULT WgcScreenSource::CreateCaptureItem(
+    ComPtr<WGC::IGraphicsCaptureItem>* result) {
+  if (!hmonitor_)
+    return E_ABORT;
+  if (!ResolveCoreWinRTDelayload())
+    return E_FAIL;
+  ComPtr<IGraphicsCaptureItemInterop> interop;
+  HRESULT hr = GetActivationFactory<
+      IGraphicsCaptureItemInterop,
+      RuntimeClass_Windows_Graphics_Capture_GraphicsCaptureItem>(&interop);
+  if (FAILED(hr))
+    return hr;
+  ComPtr<WGC::IGraphicsCaptureItem> item;
+  hr = interop->CreateForMonitor(*hmonitor_, IID_PPV_ARGS(&item));
+  if (FAILED(hr))
+    return hr;
+  if (!item)
+    return E_HANDLE;
+  *result = std::move(item);
+  return hr;
+}
+}  // namespace webrtc

webrtc/wgc_capture_source.h

@@ -0,0 +1,105 @@
+/*
+ *  Copyright (c) 2020 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+#ifndef MODULES_DESKTOP_CAPTURE_WIN_WGC_CAPTURE_SOURCE_H_
+#define MODULES_DESKTOP_CAPTURE_WIN_WGC_CAPTURE_SOURCE_H_
+#include <windows.graphics.capture.h>
+#include <wrl/client.h>
+#include <memory>
+#include "absl/types/optional.h"
+#include "modules/desktop_capture/desktop_capturer.h"
+#include "modules/desktop_capture/desktop_geometry.h"
+namespace webrtc {
+// Abstract class to represent the source that WGC-based capturers capture
+// from. Could represent an application window or a screen. Consumers should use
+// the appropriate Wgc*SourceFactory class to create WgcCaptureSource objects
+// of the appropriate type.
+class WgcCaptureSource {
+ public:
+  explicit WgcCaptureSource(DesktopCapturer::SourceId source_id);
+  virtual ~WgcCaptureSource();
+  virtual DesktopVector GetTopLeft() = 0;
+  virtual bool IsCapturable();
+  virtual bool FocusOnSource();
+  HRESULT GetCaptureItem(
+      Microsoft::WRL::ComPtr<
+          ABI::Windows::Graphics::Capture::IGraphicsCaptureItem>* result);
+  DesktopCapturer::SourceId GetSourceId() { return source_id_; }
+ protected:
+  virtual HRESULT CreateCaptureItem(
+      Microsoft::WRL::ComPtr<
+          ABI::Windows::Graphics::Capture::IGraphicsCaptureItem>* result) = 0;
+ private:
+  Microsoft::WRL::ComPtr<ABI::Windows::Graphics::Capture::IGraphicsCaptureItem>
+      item_;
+  const DesktopCapturer::SourceId source_id_;
+};
+class WgcCaptureSourceFactory {
+ public:
+  virtual ~WgcCaptureSourceFactory();
+  virtual std::unique_ptr<WgcCaptureSource> CreateCaptureSource(
+      DesktopCapturer::SourceId) = 0;
+};
+class WgcWindowSourceFactory final : public WgcCaptureSourceFactory {
+ public:
+  WgcWindowSourceFactory();
+  // Disallow copy and assign.
+  WgcWindowSourceFactory(const WgcWindowSourceFactory&) = delete;
+  WgcWindowSourceFactory& operator=(const WgcWindowSourceFactory&) = delete;
+  ~WgcWindowSourceFactory() override;
+  std::unique_ptr<WgcCaptureSource> CreateCaptureSource(
+      DesktopCapturer::SourceId) override;
+};
+class WgcScreenSourceFactory final : public WgcCaptureSourceFactory {
+ public:
+  WgcScreenSourceFactory();
+  WgcScreenSourceFactory(const WgcScreenSourceFactory&) = delete;
+  WgcScreenSourceFactory& operator=(const WgcScreenSourceFactory&) = delete;
+  ~WgcScreenSourceFactory() override;
+  std::unique_ptr<WgcCaptureSource> CreateCaptureSource(
+      DesktopCapturer::SourceId) override;
+};
+// Class for capturing application windows.
+class WgcWindowSource final : public WgcCaptureSource {
+ public:
+  explicit WgcWindowSource(DesktopCapturer::SourceId source_id);
+  WgcWindowSource(const WgcWindowSource&) = delete;
+  WgcWindowSource& operator=(const WgcWindowSource&) = delete;
+  ~WgcWindowSource() override;
+  DesktopVector GetTopLeft() override;
+  bool IsCapturable() override;
+  bool FocusOnSource() override;
+ private:
+  HRESULT CreateCaptureItem(
+      Microsoft::WRL::ComPtr<
+          ABI::Windows::Graphics::Capture::IGraphicsCaptureItem>* result)
+      override;
+};
+// Class for capturing screens/monitors/displays.
+class WgcScreenSource final : public WgcCaptureSource {
+ public:
+  explicit WgcScreenSource(DesktopCapturer::SourceId source_id);
+  WgcScreenSource(const WgcScreenSource&) = delete;
+  WgcScreenSource& operator=(const WgcScreenSource&) = delete;
+  ~WgcScreenSource() override;
+  DesktopVector GetTopLeft() override;
+  bool IsCapturable() override;
+ private:
+  HRESULT CreateCaptureItem(
+      Microsoft::WRL::ComPtr<
+          ABI::Windows::Graphics::Capture::IGraphicsCaptureItem>* result)
+      override;
+  // To maintain compatibility with other capturers, this class accepts a
+  // device index as it's SourceId. However, WGC requires we use an HMONITOR to
+  // describe which screen to capture. So, we internally convert the supplied
+  // device index into an HMONITOR when |IsCapturable()| is called.
+  absl::optional<HMONITOR> hmonitor_;
+};
+}  // namespace webrtc
+#endif  // MODULES_DESKTOP_CAPTURE_WIN_WGC_CAPTURE_SOURCE_H_

webrtc/wgc_capture_source_unittest.cc

@@ -0,0 +1,113 @@
+/*
+ *  Copyright (c) 2021 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+#include "modules/desktop_capture/win/wgc_capture_source.h"
+#include <windows.graphics.capture.h>
+#include <wrl/client.h>
+#include <utility>
+#include "modules/desktop_capture/desktop_capture_types.h"
+#include "modules/desktop_capture/desktop_geometry.h"
+#include "modules/desktop_capture/win/screen_capture_utils.h"
+#include "modules/desktop_capture/win/test_support/test_window.h"
+#include "rtc_base/checks.h"
+#include "rtc_base/logging.h"
+#include "rtc_base/win/scoped_com_initializer.h"
+#include "rtc_base/win/windows_version.h"
+#include "test/gtest.h"
+namespace webrtc {
+namespace {
+const WCHAR kWindowTitle[] = L"WGC Capture Source Test Window";
+const int kFirstXCoord = 25;
+const int kFirstYCoord = 50;
+const int kSecondXCoord = 50;
+const int kSecondYCoord = 75;
+enum SourceType { kWindowSource = 0, kScreenSource = 1 };
+}  // namespace
+class WgcCaptureSourceTest : public ::testing::TestWithParam<SourceType> {
+ public:
+  void SetUp() override {
+    if (rtc::rtc_win::GetVersion() < rtc::rtc_win::Version::VERSION_WIN10_RS5) {
+      RTC_LOG(LS_INFO)
+          << "Skipping WgcCaptureSourceTests on Windows versions < RS5.";
+      GTEST_SKIP();
+    }
+    com_initializer_ =
+        std::make_unique<ScopedCOMInitializer>(ScopedCOMInitializer::kMTA);
+    ASSERT_TRUE(com_initializer_->Succeeded());
+  }
+  void TearDown() override {
+    if (window_open_) {
+      DestroyTestWindow(window_info_);
+    }
+  }
+  void SetUpForWindowSource() {
+    window_info_ = CreateTestWindow(kWindowTitle);
+    window_open_ = true;
+    source_id_ = reinterpret_cast<DesktopCapturer::SourceId>(window_info_.hwnd);
+    source_factory_ = std::make_unique<WgcWindowSourceFactory>();
+  }
+  void SetUpForScreenSource() {
+    source_id_ = kFullDesktopScreenId;
+    source_factory_ = std::make_unique<WgcScreenSourceFactory>();
+  }
+ protected:
+  std::unique_ptr<ScopedCOMInitializer> com_initializer_;
+  std::unique_ptr<WgcCaptureSourceFactory> source_factory_;
+  std::unique_ptr<WgcCaptureSource> source_;
+  DesktopCapturer::SourceId source_id_;
+  WindowInfo window_info_;
+  bool window_open_ = false;
+};
+// Window specific test
+TEST_F(WgcCaptureSourceTest, WindowPosition) {
+  SetUpForWindowSource();
+  source_ = source_factory_->CreateCaptureSource(source_id_);
+  ASSERT_TRUE(source_);
+  EXPECT_EQ(source_->GetSourceId(), source_id_);
+  MoveTestWindow(window_info_.hwnd, kFirstXCoord, kFirstYCoord);
+  DesktopVector source_vector = source_->GetTopLeft();
+  EXPECT_EQ(source_vector.x(), kFirstXCoord);
+  EXPECT_EQ(source_vector.y(), kFirstYCoord);
+  MoveTestWindow(window_info_.hwnd, kSecondXCoord, kSecondYCoord);
+  source_vector = source_->GetTopLeft();
+  EXPECT_EQ(source_vector.x(), kSecondXCoord);
+  EXPECT_EQ(source_vector.y(), kSecondYCoord);
+}
+// Screen specific test
+TEST_F(WgcCaptureSourceTest, ScreenPosition) {
+  SetUpForScreenSource();
+  source_ = source_factory_->CreateCaptureSource(source_id_);
+  ASSERT_TRUE(source_);
+  EXPECT_EQ(source_id_, source_->GetSourceId());
+  DesktopRect screen_rect = GetFullscreenRect();
+  DesktopVector source_vector = source_->GetTopLeft();
+  EXPECT_EQ(source_vector.x(), screen_rect.left());
+  EXPECT_EQ(source_vector.y(), screen_rect.top());
+}
+// Source agnostic test
+TEST_P(WgcCaptureSourceTest, CreateSource) {
+  if (GetParam() == SourceType::kWindowSource) {
+    SetUpForWindowSource();
+  } else {
+    SetUpForScreenSource();
+  }
+  source_ = source_factory_->CreateCaptureSource(source_id_);
+  ASSERT_TRUE(source_);
+  EXPECT_EQ(source_id_, source_->GetSourceId());
+  EXPECT_TRUE(source_->IsCapturable());
+  Microsoft::WRL::ComPtr<ABI::Windows::Graphics::Capture::IGraphicsCaptureItem>
+      item;
+  EXPECT_TRUE(SUCCEEDED(source_->GetCaptureItem(&item)));
+  EXPECT_TRUE(item);
+}
+INSTANTIATE_TEST_SUITE_P(SourceAgnostic,
+                         WgcCaptureSourceTest,
+                         ::testing::Values(SourceType::kWindowSource,
+                                           SourceType::kScreenSource));
+}  // namespace webrtc

webrtc/wgc_capturer_win.cc

@@ -0,0 +1,218 @@
+/*
+ *  Copyright (c) 2020 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "modules/desktop_capture/win/wgc_capturer_win.h"
+
+#include <utility>
+
+#include "modules/desktop_capture/desktop_capture_metrics_helper.h"
+#include "modules/desktop_capture/desktop_capture_types.h"
+#include "modules/desktop_capture/win/wgc_desktop_frame.h"
+#include "rtc_base/logging.h"
+#include "rtc_base/time_utils.h"
+#include "system_wrappers/include/metrics.h"
+
+namespace WGC = ABI::Windows::Graphics::Capture;
+using Microsoft::WRL::ComPtr;
+
+namespace webrtc {
+
+namespace {
+
+enum class WgcCapturerResult {
+  kSuccess = 0,
+  kNoDirect3dDevice = 1,
+  kNoSourceSelected = 2,
+  kItemCreationFailure = 3,
+  kSessionStartFailure = 4,
+  kGetFrameFailure = 5,
+  kFrameDropped = 6,
+  kMaxValue = kFrameDropped
+};
+
+void RecordWgcCapturerResult(WgcCapturerResult error) {
+  RTC_HISTOGRAM_ENUMERATION("WebRTC.DesktopCapture.Win.WgcCapturerResult",
+                            static_cast<int>(error),
+                            static_cast<int>(WgcCapturerResult::kMaxValue));
+}
+
+}  // namespace
+
+WgcCapturerWin::WgcCapturerWin(
+    std::unique_ptr<WgcCaptureSourceFactory> source_factory,
+    std::unique_ptr<SourceEnumerator> source_enumerator)
+    : source_factory_(std::move(source_factory)),
+      source_enumerator_(std::move(source_enumerator)) {}
+WgcCapturerWin::~WgcCapturerWin() = default;
+
+// static
+std::unique_ptr<DesktopCapturer> WgcCapturerWin::CreateRawWindowCapturer(
+    const DesktopCaptureOptions& options) {
+  return std::make_unique<WgcCapturerWin>(
+      std::make_unique<WgcWindowSourceFactory>(),
+      std::make_unique<WindowEnumerator>(
+          options.enumerate_current_process_windows()));
+}
+
+// static
+std::unique_ptr<DesktopCapturer> WgcCapturerWin::CreateRawScreenCapturer(
+    const DesktopCaptureOptions& options) {
+  return std::make_unique<WgcCapturerWin>(
+      std::make_unique<WgcScreenSourceFactory>(),
+      std::make_unique<ScreenEnumerator>());
+}
+
+bool WgcCapturerWin::GetSourceList(SourceList* sources) {
+  return source_enumerator_->FindAllSources(sources);
+}
+
+bool WgcCapturerWin::SelectSource(DesktopCapturer::SourceId id) {
+  capture_source_ = source_factory_->CreateCaptureSource(id);
+  return capture_source_->IsCapturable();
+}
+
+bool WgcCapturerWin::FocusOnSelectedSource() {
+  if (!capture_source_)
+    return false;
+
+  return capture_source_->FocusOnSource();
+}
+
+void WgcCapturerWin::Start(Callback* callback) {
+  RTC_DCHECK(!callback_);
+  RTC_DCHECK(callback);
+  RecordCapturerImpl(DesktopCapturerId::kWgcCapturerWin);
+
+  callback_ = callback;
+
+  // Create a Direct3D11 device to share amongst the WgcCaptureSessions. Many
+  // parameters are nullptr as the implemention uses defaults that work well for
+  // us.
+  HRESULT hr = D3D11CreateDevice(
+      /*adapter=*/nullptr, D3D_DRIVER_TYPE_HARDWARE,
+      /*software_rasterizer=*/nullptr, D3D11_CREATE_DEVICE_BGRA_SUPPORT,
+      /*feature_levels=*/nullptr, /*feature_levels_size=*/0, D3D11_SDK_VERSION,
+      &d3d11_device_, /*feature_level=*/nullptr, /*device_context=*/nullptr);
+  if (hr == DXGI_ERROR_UNSUPPORTED) {
+    // If a hardware device could not be created, use WARP which is a high speed
+    // software device.
+    hr = D3D11CreateDevice(
+        /*adapter=*/nullptr, D3D_DRIVER_TYPE_WARP,
+        /*software_rasterizer=*/nullptr, D3D11_CREATE_DEVICE_BGRA_SUPPORT,
+        /*feature_levels=*/nullptr, /*feature_levels_size=*/0,
+        D3D11_SDK_VERSION, &d3d11_device_, /*feature_level=*/nullptr,
+        /*device_context=*/nullptr);
+  }
+
+  if (FAILED(hr)) {
+    RTC_LOG(LS_ERROR) << "Failed to create D3D11Device: " << hr;
+  }
+}
+
+void WgcCapturerWin::CaptureFrame() {
+  RTC_DCHECK(callback_);
+
+  if (!capture_source_) {
+    RTC_LOG(LS_ERROR) << "Source hasn't been selected";
+    callback_->OnCaptureResult(DesktopCapturer::Result::ERROR_PERMANENT,
+                               /*frame=*/nullptr);
+    RecordWgcCapturerResult(WgcCapturerResult::kNoSourceSelected);
+    return;
+  }
+
+  if (!d3d11_device_) {
+    RTC_LOG(LS_ERROR) << "No D3D11D3evice, cannot capture.";
+    callback_->OnCaptureResult(DesktopCapturer::Result::ERROR_PERMANENT,
+                               /*frame=*/nullptr);
+    RecordWgcCapturerResult(WgcCapturerResult::kNoDirect3dDevice);
+    return;
+  }
+
+  int64_t capture_start_time_nanos = rtc::TimeNanos();
+
+  HRESULT hr;
+  WgcCaptureSession* capture_session = nullptr;
+  std::map<SourceId, WgcCaptureSession>::iterator session_iter =
+      ongoing_captures_.find(capture_source_->GetSourceId());
+  if (session_iter == ongoing_captures_.end()) {
+    ComPtr<WGC::IGraphicsCaptureItem> item;
+    hr = capture_source_->GetCaptureItem(&item);
+    if (FAILED(hr)) {
+      RTC_LOG(LS_ERROR) << "Failed to create a GraphicsCaptureItem: " << hr;
+      callback_->OnCaptureResult(DesktopCapturer::Result::ERROR_PERMANENT,
+                                 /*frame=*/nullptr);
+      RecordWgcCapturerResult(WgcCapturerResult::kItemCreationFailure);
+      return;
+    }
+
+    std::pair<std::map<SourceId, WgcCaptureSession>::iterator, bool>
+        iter_success_pair = ongoing_captures_.emplace(
+            std::piecewise_construct,
+            std::forward_as_tuple(capture_source_->GetSourceId()),
+            std::forward_as_tuple(d3d11_device_, item));
+    RTC_DCHECK(iter_success_pair.second);
+    capture_session = &iter_success_pair.first->second;
+  } else {
+    capture_session = &session_iter->second;
+  }
+
+  if (!capture_session->IsCaptureStarted()) {
+    hr = capture_session->StartCapture();
+    if (FAILED(hr)) {
+      RTC_LOG(LS_ERROR) << "Failed to start capture: " << hr;
+      ongoing_captures_.erase(capture_source_->GetSourceId());
+      callback_->OnCaptureResult(DesktopCapturer::Result::ERROR_PERMANENT,
+                                 /*frame=*/nullptr);
+      RecordWgcCapturerResult(WgcCapturerResult::kSessionStartFailure);
+      return;
+    }
+  }
+
+  std::unique_ptr<DesktopFrame> frame;
+  hr = capture_session->GetFrame(&frame);
+  if (FAILED(hr)) {
+    RTC_LOG(LS_ERROR) << "GetFrame failed: " << hr;
+    ongoing_captures_.erase(capture_source_->GetSourceId());
+    callback_->OnCaptureResult(DesktopCapturer::Result::ERROR_PERMANENT,
+                               /*frame=*/nullptr);
+    RecordWgcCapturerResult(WgcCapturerResult::kGetFrameFailure);
+    return;
+  }
+
+  if (!frame) {
+    callback_->OnCaptureResult(DesktopCapturer::Result::ERROR_TEMPORARY,
+                               /*frame=*/nullptr);
+    RecordWgcCapturerResult(WgcCapturerResult::kFrameDropped);
+    return;
+  }
+
+  int capture_time_ms = (rtc::TimeNanos() - capture_start_time_nanos) /
+                        rtc::kNumNanosecsPerMillisec;
+  RTC_HISTOGRAM_COUNTS_1000("WebRTC.DesktopCapture.Win.WgcCapturerFrameTime",
+                            capture_time_ms);
+  frame->set_capture_time_ms(capture_time_ms);
+  frame->set_capturer_id(DesktopCapturerId::kWgcCapturerWin);
+  frame->set_may_contain_cursor(true);
+  frame->set_top_left(capture_source_->GetTopLeft());
+  RecordWgcCapturerResult(WgcCapturerResult::kSuccess);
+  callback_->OnCaptureResult(DesktopCapturer::Result::SUCCESS,
+                             std::move(frame));
+}
+
+bool WgcCapturerWin::IsSourceBeingCaptured(DesktopCapturer::SourceId id) {
+  std::map<DesktopCapturer::SourceId, WgcCaptureSession>::iterator
+      session_iter = ongoing_captures_.find(id);
+  if (session_iter == ongoing_captures_.end())
+    return false;
+
+  return session_iter->second.IsCaptureStarted();
+}
+
+}  // namespace webrtc

webrtc/wgc_capturer_win.h

@@ -0,0 +1,138 @@
+/*
+ *  Copyright (c) 2020 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef MODULES_DESKTOP_CAPTURE_WIN_WGC_CAPTURER_WIN_H_
+#define MODULES_DESKTOP_CAPTURE_WIN_WGC_CAPTURER_WIN_H_
+
+#include <d3d11.h>
+#include <wrl/client.h>
+
+#include <map>
+#include <memory>
+
+#include "modules/desktop_capture/desktop_capture_options.h"
+#include "modules/desktop_capture/desktop_capturer.h"
+#include "modules/desktop_capture/win/screen_capture_utils.h"
+#include "modules/desktop_capture/win/wgc_capture_session.h"
+#include "modules/desktop_capture/win/wgc_capture_source.h"
+#include "modules/desktop_capture/win/window_capture_utils.h"
+
+namespace webrtc {
+
+// WgcCapturerWin is initialized with an implementation of this base class,
+// which it uses to find capturable sources of a particular type. This way,
+// WgcCapturerWin can remain source-agnostic.
+class SourceEnumerator {
+ public:
+  virtual ~SourceEnumerator() = default;
+
+  virtual bool FindAllSources(DesktopCapturer::SourceList* sources) = 0;
+};
+
+class WindowEnumerator final : public SourceEnumerator {
+ public:
+  explicit WindowEnumerator(bool enumerate_current_process_windows)
+      : enumerate_current_process_windows_(enumerate_current_process_windows) {}
+
+  WindowEnumerator(const WindowEnumerator&) = delete;
+  WindowEnumerator& operator=(const WindowEnumerator&) = delete;
+
+  ~WindowEnumerator() override = default;
+
+  bool FindAllSources(DesktopCapturer::SourceList* sources) override {
+    // WGC fails to capture windows with the WS_EX_TOOLWINDOW style, so we
+    // provide it as a filter to ensure windows with the style are not returned.
+    return window_capture_helper_.EnumerateCapturableWindows(
+        sources, enumerate_current_process_windows_, WS_EX_TOOLWINDOW);
+  }
+
+ private:
+  WindowCaptureHelperWin window_capture_helper_;
+  bool enumerate_current_process_windows_;
+};
+
+class ScreenEnumerator final : public SourceEnumerator {
+ public:
+  ScreenEnumerator() = default;
+
+  ScreenEnumerator(const ScreenEnumerator&) = delete;
+  ScreenEnumerator& operator=(const ScreenEnumerator&) = delete;
+
+  ~ScreenEnumerator() override = default;
+
+  bool FindAllSources(DesktopCapturer::SourceList* sources) override {
+    return webrtc::GetScreenList(sources);
+  }
+};
+
+// A capturer that uses the Window.Graphics.Capture APIs. It is suitable for
+// both window and screen capture (but only one type per instance). Consumers
+// should not instantiate this class directly, instead they should use
+// |CreateRawWindowCapturer()| or |CreateRawScreenCapturer()| to receive a
+// capturer appropriate for the type of source they want to capture.
+class WgcCapturerWin : public DesktopCapturer {
+ public:
+  WgcCapturerWin(std::unique_ptr<WgcCaptureSourceFactory> source_factory,
+                 std::unique_ptr<SourceEnumerator> source_enumerator);
+
+  WgcCapturerWin(const WgcCapturerWin&) = delete;
+  WgcCapturerWin& operator=(const WgcCapturerWin&) = delete;
+
+  ~WgcCapturerWin() override;
+
+  static std::unique_ptr<DesktopCapturer> CreateRawWindowCapturer(
+      const DesktopCaptureOptions& options);
+
+  static std::unique_ptr<DesktopCapturer> CreateRawScreenCapturer(
+      const DesktopCaptureOptions& options);
+
+  // DesktopCapturer interface.
+  bool GetSourceList(SourceList* sources) override;
+  bool SelectSource(SourceId id) override;
+  bool FocusOnSelectedSource() override;
+  void Start(Callback* callback) override;
+  void CaptureFrame() override;
+
+  // Used in WgcCapturerTests.
+  bool IsSourceBeingCaptured(SourceId id);
+
+ private:
+  // Factory to create a WgcCaptureSource for us whenever SelectSource is
+  // called. Initialized at construction with a source-specific implementation.
+  std::unique_ptr<WgcCaptureSourceFactory> source_factory_;
+
+  // The source enumerator helps us find capturable sources of the appropriate
+  // type. Initialized at construction with a source-specific implementation.
+  std::unique_ptr<SourceEnumerator> source_enumerator_;
+
+  // The WgcCaptureSource represents the source we are capturing. It tells us
+  // if the source is capturable and it creates the GraphicsCaptureItem for us.
+  std::unique_ptr<WgcCaptureSource> capture_source_;
+
+  // A map of all the sources we are capturing and the associated
+  // WgcCaptureSession. Frames for the current source (indicated via
+  // SelectSource) will be retrieved from the appropriate session when
+  // requested via CaptureFrame.
+  // This helps us efficiently capture multiple sources (e.g. when consumers
+  // are trying to display a list of available capture targets with thumbnails).
+  std::map<SourceId, WgcCaptureSession> ongoing_captures_;
+
+  // The callback that we deliver frames to, synchronously, before CaptureFrame
+  // returns.
+  Callback* callback_ = nullptr;
+
+  // A Direct3D11 device that is shared amongst the WgcCaptureSessions, who
+  // require one to perform the capture.
+  Microsoft::WRL::ComPtr<::ID3D11Device> d3d11_device_;
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_DESKTOP_CAPTURE_WIN_WGC_CAPTURER_WIN_H_

webrtc/wgc_capturer_win_unittest.cc

@@ -0,0 +1,421 @@
+/*
+ *  Copyright (c) 2020 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+#include "modules/desktop_capture/win/wgc_capturer_win.h"
+#include <string>
+#include <utility>
+#include <vector>
+#include "modules/desktop_capture/desktop_capture_options.h"
+#include "modules/desktop_capture/desktop_capture_types.h"
+#include "modules/desktop_capture/desktop_capturer.h"
+#include "modules/desktop_capture/win/test_support/test_window.h"
+#include "modules/desktop_capture/win/window_capture_utils.h"
+#include "rtc_base/checks.h"
+#include "rtc_base/logging.h"
+#include "rtc_base/thread.h"
+#include "rtc_base/time_utils.h"
+#include "rtc_base/win/scoped_com_initializer.h"
+#include "rtc_base/win/windows_version.h"
+#include "system_wrappers/include/metrics.h"
+#include "test/gtest.h"
+namespace webrtc {
+namespace {
+const char kWindowThreadName[] = "wgc_capturer_test_window_thread";
+const WCHAR kWindowTitle[] = L"WGC Capturer Test Window";
+const char kCapturerImplHistogram[] =
+    "WebRTC.DesktopCapture.Win.DesktopCapturerImpl";
+const char kCapturerResultHistogram[] =
+    "WebRTC.DesktopCapture.Win.WgcCapturerResult";
+const int kSuccess = 0;
+const int kSessionStartFailure = 4;
+const char kCaptureSessionResultHistogram[] =
+    "WebRTC.DesktopCapture.Win.WgcCaptureSessionStartResult";
+const int kSourceClosed = 1;
+const char kCaptureTimeHistogram[] =
+    "WebRTC.DesktopCapture.Win.WgcCapturerFrameTime";
+const int kSmallWindowWidth = 200;
+const int kSmallWindowHeight = 100;
+const int kMediumWindowWidth = 300;
+const int kMediumWindowHeight = 200;
+const int kLargeWindowWidth = 400;
+const int kLargeWindowHeight = 500;
+// The size of the image we capture is slightly smaller than the actual size of
+// the window.
+const int kWindowWidthSubtrahend = 14;
+const int kWindowHeightSubtrahend = 7;
+// Custom message constants so we can direct our thread to close windows
+// and quit running.
+const UINT kNoOp = WM_APP;
+const UINT kDestroyWindow = WM_APP + 1;
+const UINT kQuitRunning = WM_APP + 2;
+enum CaptureType { kWindowCapture = 0, kScreenCapture = 1 };
+}  // namespace
+class WgcCapturerWinTest : public ::testing::TestWithParam<CaptureType>,
+                           public DesktopCapturer::Callback {
+ public:
+  void SetUp() override {
+    if (rtc::rtc_win::GetVersion() < rtc::rtc_win::Version::VERSION_WIN10_RS5) {
+      RTC_LOG(LS_INFO)
+          << "Skipping WgcCapturerWinTests on Windows versions < RS5.";
+      GTEST_SKIP();
+    }
+    com_initializer_ =
+        std::make_unique<ScopedCOMInitializer>(ScopedCOMInitializer::kMTA);
+    EXPECT_TRUE(com_initializer_->Succeeded());
+  }
+  void SetUpForWindowCapture(int window_width = kMediumWindowWidth,
+                             int window_height = kMediumWindowHeight) {
+    capturer_ = WgcCapturerWin::CreateRawWindowCapturer(
+        DesktopCaptureOptions::CreateDefault());
+    CreateWindowOnSeparateThread(window_width, window_height);
+    StartWindowThreadMessageLoop();
+    source_id_ = GetTestWindowIdFromSourceList();
+  }
+  void SetUpForScreenCapture() {
+    capturer_ = WgcCapturerWin::CreateRawScreenCapturer(
+        DesktopCaptureOptions::CreateDefault());
+    source_id_ = GetScreenIdFromSourceList();
+  }
+  void TearDown() override {
+    if (window_open_) {
+      CloseTestWindow();
+    }
+  }
+  // The window must live on a separate thread so that we can run a message pump
+  // without blocking the test thread. This is necessary if we are interested in
+  // having GraphicsCaptureItem events (i.e. the Closed event) fire, and it more
+  // closely resembles how capture works in the wild.
+  void CreateWindowOnSeparateThread(int window_width, int window_height) {
+    window_thread_ = rtc::Thread::Create();
+    window_thread_->SetName(kWindowThreadName, nullptr);
+    window_thread_->Start();
+    window_thread_->Invoke<void>(RTC_FROM_HERE, [this, window_width,
+                                                 window_height]() {
+      window_thread_id_ = GetCurrentThreadId();
+      window_info_ =
+          CreateTestWindow(kWindowTitle, window_height, window_width);
+      window_open_ = true;
+      while (!IsWindowResponding(window_info_.hwnd)) {
+        RTC_LOG(LS_INFO) << "Waiting for test window to become responsive in "
+                            "WgcWindowCaptureTest.";
+      }
+      while (!IsWindowValidAndVisible(window_info_.hwnd)) {
+        RTC_LOG(LS_INFO) << "Waiting for test window to be visible in "
+                            "WgcWindowCaptureTest.";
+      }
+    });
+    ASSERT_TRUE(window_thread_->RunningForTest());
+    ASSERT_FALSE(window_thread_->IsCurrent());
+  }
+  void StartWindowThreadMessageLoop() {
+    window_thread_->PostTask(RTC_FROM_HERE, [this]() {
+      MSG msg;
+      BOOL gm;
+      while ((gm = ::GetMessage(&msg, NULL, 0, 0)) != 0 && gm != -1) {
+        ::DispatchMessage(&msg);
+        if (msg.message == kDestroyWindow) {
+          DestroyTestWindow(window_info_);
+        }
+        if (msg.message == kQuitRunning) {
+          PostQuitMessage(0);
+        }
+      }
+    });
+  }
+  void CloseTestWindow() {
+    ::PostThreadMessage(window_thread_id_, kDestroyWindow, 0, 0);
+    ::PostThreadMessage(window_thread_id_, kQuitRunning, 0, 0);
+    window_thread_->Stop();
+    window_open_ = false;
+  }
+  DesktopCapturer::SourceId GetTestWindowIdFromSourceList() {
+    // Frequently, the test window will not show up in GetSourceList because it
+    // was created too recently. Since we are confident the window will be found
+    // eventually we loop here until we find it.
+    intptr_t src_id;
+    do {
+      DesktopCapturer::SourceList sources;
+      EXPECT_TRUE(capturer_->GetSourceList(&sources));
+      auto it = std::find_if(
+          sources.begin(), sources.end(),
+          [&](const DesktopCapturer::Source& src) {
+            return src.id == reinterpret_cast<intptr_t>(window_info_.hwnd);
+          });
+      src_id = it->id;
+    } while (src_id != reinterpret_cast<intptr_t>(window_info_.hwnd));
+    return src_id;
+  }
+  DesktopCapturer::SourceId GetScreenIdFromSourceList() {
+    DesktopCapturer::SourceList sources;
+    EXPECT_TRUE(capturer_->GetSourceList(&sources));
+    EXPECT_GT(sources.size(), 0ULL);
+    return sources[0].id;
+  }
+  void DoCapture() {
+    // Sometimes the first few frames are empty becaues the capture engine is
+    // still starting up. We also may drop a few frames when the window is
+    // resized or un-minimized.
+    do {
+      capturer_->CaptureFrame();
+    } while (result_ == DesktopCapturer::Result::ERROR_TEMPORARY);
+    EXPECT_EQ(result_, DesktopCapturer::Result::SUCCESS);
+    EXPECT_TRUE(frame_);
+    EXPECT_GT(metrics::NumEvents(kCapturerResultHistogram, kSuccess),
+              successful_captures_);
+    ++successful_captures_;
+  }
+  void ValidateFrame(int expected_width, int expected_height) {
+    EXPECT_EQ(frame_->size().width(), expected_width - kWindowWidthSubtrahend);
+    EXPECT_EQ(frame_->size().height(),
+              expected_height - kWindowHeightSubtrahend);
+    // Verify the buffer contains as much data as it should, and that the right
+    // colors are found.
+    int data_length = frame_->stride() * frame_->size().height();
+    // The first and last pixel should have the same color because they will be
+    // from the border of the window.
+    // Pixels have 4 bytes of data so the whole pixel needs a uint32_t to fit.
+    uint32_t first_pixel = static_cast<uint32_t>(*frame_->data());
+    uint32_t last_pixel = static_cast<uint32_t>(
+        *(frame_->data() + data_length - DesktopFrame::kBytesPerPixel));
+    EXPECT_EQ(first_pixel, last_pixel);
+    // Let's also check a pixel from the middle of the content area, which the
+    // TestWindow will paint a consistent color for us to verify.
+    uint8_t* middle_pixel = frame_->data() + (data_length / 2);
+    int sub_pixel_offset = DesktopFrame::kBytesPerPixel / 4;
+    EXPECT_EQ(*middle_pixel, kTestWindowBValue);
+    middle_pixel += sub_pixel_offset;
+    EXPECT_EQ(*middle_pixel, kTestWindowGValue);
+    middle_pixel += sub_pixel_offset;
+    EXPECT_EQ(*middle_pixel, kTestWindowRValue);
+    middle_pixel += sub_pixel_offset;
+    // The window is opaque so we expect 0xFF for the Alpha channel.
+    EXPECT_EQ(*middle_pixel, 0xFF);
+  }
+  // DesktopCapturer::Callback interface
+  // The capturer synchronously invokes this method before |CaptureFrame()|
+  // returns.
+  void OnCaptureResult(DesktopCapturer::Result result,
+                       std::unique_ptr<DesktopFrame> frame) override {
+    result_ = result;
+    frame_ = std::move(frame);
+  }
+ protected:
+  std::unique_ptr<ScopedCOMInitializer> com_initializer_;
+  DWORD window_thread_id_;
+  std::unique_ptr<rtc::Thread> window_thread_;
+  WindowInfo window_info_;
+  intptr_t source_id_;
+  bool window_open_ = false;
+  DesktopCapturer::Result result_;
+  int successful_captures_ = 0;
+  std::unique_ptr<DesktopFrame> frame_;
+  std::unique_ptr<DesktopCapturer> capturer_;
+};
+TEST_P(WgcCapturerWinTest, SelectValidSource) {
+  if (GetParam() == CaptureType::kWindowCapture) {
+    SetUpForWindowCapture();
+  } else {
+    SetUpForScreenCapture();
+  }
+  EXPECT_TRUE(capturer_->SelectSource(source_id_));
+}
+TEST_P(WgcCapturerWinTest, SelectInvalidSource) {
+  if (GetParam() == CaptureType::kWindowCapture) {
+    capturer_ = WgcCapturerWin::CreateRawWindowCapturer(
+        DesktopCaptureOptions::CreateDefault());
+    source_id_ = kNullWindowId;
+  } else {
+    capturer_ = WgcCapturerWin::CreateRawScreenCapturer(
+        DesktopCaptureOptions::CreateDefault());
+    source_id_ = kInvalidScreenId;
+  }
+  EXPECT_FALSE(capturer_->SelectSource(source_id_));
+}
+TEST_P(WgcCapturerWinTest, Capture) {
+  if (GetParam() == CaptureType::kWindowCapture) {
+    SetUpForWindowCapture();
+  } else {
+    SetUpForScreenCapture();
+  }
+  EXPECT_TRUE(capturer_->SelectSource(source_id_));
+  capturer_->Start(this);
+  EXPECT_GE(metrics::NumEvents(kCapturerImplHistogram,
+                               DesktopCapturerId::kWgcCapturerWin),
+            1);
+  DoCapture();
+  EXPECT_GT(frame_->size().width(), 0);
+  EXPECT_GT(frame_->size().height(), 0);
+}
+TEST_P(WgcCapturerWinTest, CaptureTime) {
+  if (GetParam() == CaptureType::kWindowCapture) {
+    SetUpForWindowCapture();
+  } else {
+    SetUpForScreenCapture();
+  }
+  EXPECT_TRUE(capturer_->SelectSource(source_id_));
+  capturer_->Start(this);
+  int64_t start_time;
+  do {
+    start_time = rtc::TimeNanos();
+    capturer_->CaptureFrame();
+  } while (result_ == DesktopCapturer::Result::ERROR_TEMPORARY);
+  int capture_time_ms =
+      (rtc::TimeNanos() - start_time) / rtc::kNumNanosecsPerMillisec;
+  EXPECT_TRUE(frame_);
+  // The test may measure the time slightly differently than the capturer. So we
+  // just check if it's within 5 ms.
+  EXPECT_NEAR(frame_->capture_time_ms(), capture_time_ms, 5);
+  EXPECT_GE(
+      metrics::NumEvents(kCaptureTimeHistogram, frame_->capture_time_ms()), 1);
+}
+INSTANTIATE_TEST_SUITE_P(SourceAgnostic,
+                         WgcCapturerWinTest,
+                         ::testing::Values(CaptureType::kWindowCapture,
+                                           CaptureType::kScreenCapture));
+// Monitor specific tests.
+TEST_F(WgcCapturerWinTest, FocusOnMonitor) {
+  SetUpForScreenCapture();
+  EXPECT_TRUE(capturer_->SelectSource(0));
+  // You can't set focus on a monitor.
+  EXPECT_FALSE(capturer_->FocusOnSelectedSource());
+}
+TEST_F(WgcCapturerWinTest, CaptureAllMonitors) {
+  SetUpForScreenCapture();
+  EXPECT_TRUE(capturer_->SelectSource(kFullDesktopScreenId));
+  capturer_->Start(this);
+  DoCapture();
+  EXPECT_GT(frame_->size().width(), 0);
+  EXPECT_GT(frame_->size().height(), 0);
+}
+// Window specific tests.
+TEST_F(WgcCapturerWinTest, FocusOnWindow) {
+  capturer_ = WgcCapturerWin::CreateRawWindowCapturer(
+      DesktopCaptureOptions::CreateDefault());
+  window_info_ = CreateTestWindow(kWindowTitle);
+  source_id_ = GetScreenIdFromSourceList();
+  EXPECT_TRUE(capturer_->SelectSource(source_id_));
+  EXPECT_TRUE(capturer_->FocusOnSelectedSource());
+  HWND hwnd = reinterpret_cast<HWND>(source_id_);
+  EXPECT_EQ(hwnd, ::GetActiveWindow());
+  EXPECT_EQ(hwnd, ::GetForegroundWindow());
+  EXPECT_EQ(hwnd, ::GetFocus());
+  DestroyTestWindow(window_info_);
+}
+TEST_F(WgcCapturerWinTest, SelectMinimizedWindow) {
+  SetUpForWindowCapture();
+  MinimizeTestWindow(reinterpret_cast<HWND>(source_id_));
+  EXPECT_FALSE(capturer_->SelectSource(source_id_));
+  UnminimizeTestWindow(reinterpret_cast<HWND>(source_id_));
+  EXPECT_TRUE(capturer_->SelectSource(source_id_));
+}
+TEST_F(WgcCapturerWinTest, SelectClosedWindow) {
+  SetUpForWindowCapture();
+  EXPECT_TRUE(capturer_->SelectSource(source_id_));
+  CloseTestWindow();
+  EXPECT_FALSE(capturer_->SelectSource(source_id_));
+}
+TEST_F(WgcCapturerWinTest, UnsupportedWindowStyle) {
+  // Create a window with the WS_EX_TOOLWINDOW style, which WGC does not
+  // support.
+  window_info_ = CreateTestWindow(kWindowTitle, kMediumWindowWidth,
+                                  kMediumWindowHeight, WS_EX_TOOLWINDOW);
+  capturer_ = WgcCapturerWin::CreateRawWindowCapturer(
+      DesktopCaptureOptions::CreateDefault());
+  DesktopCapturer::SourceList sources;
+  EXPECT_TRUE(capturer_->GetSourceList(&sources));
+  auto it = std::find_if(
+      sources.begin(), sources.end(), [&](const DesktopCapturer::Source& src) {
+        return src.id == reinterpret_cast<intptr_t>(window_info_.hwnd);
+      });
+  // We should not find the window, since we filter for unsupported styles.
+  EXPECT_EQ(it, sources.end());
+  DestroyTestWindow(window_info_);
+}
+TEST_F(WgcCapturerWinTest, IncreaseWindowSizeMidCapture) {
+  SetUpForWindowCapture(kSmallWindowWidth, kSmallWindowHeight);
+  EXPECT_TRUE(capturer_->SelectSource(source_id_));
+  capturer_->Start(this);
+  DoCapture();
+  ValidateFrame(kSmallWindowWidth, kSmallWindowHeight);
+  ResizeTestWindow(window_info_.hwnd, kSmallWindowWidth, kMediumWindowHeight);
+  DoCapture();
+  // We don't expect to see the new size until the next capture, as the frame
+  // pool hadn't had a chance to resize yet to fit the new, larger image.
+  DoCapture();
+  ValidateFrame(kSmallWindowWidth, kMediumWindowHeight);
+  ResizeTestWindow(window_info_.hwnd, kLargeWindowWidth, kMediumWindowHeight);
+  DoCapture();
+  DoCapture();
+  ValidateFrame(kLargeWindowWidth, kMediumWindowHeight);
+}
+TEST_F(WgcCapturerWinTest, ReduceWindowSizeMidCapture) {
+  SetUpForWindowCapture(kLargeWindowWidth, kLargeWindowHeight);
+  EXPECT_TRUE(capturer_->SelectSource(source_id_));
+  capturer_->Start(this);
+  DoCapture();
+  ValidateFrame(kLargeWindowWidth, kLargeWindowHeight);
+  ResizeTestWindow(window_info_.hwnd, kLargeWindowWidth, kMediumWindowHeight);
+  // We expect to see the new size immediately because the image data has shrunk
+  // and will fit in the existing buffer.
+  DoCapture();
+  ValidateFrame(kLargeWindowWidth, kMediumWindowHeight);
+  ResizeTestWindow(window_info_.hwnd, kSmallWindowWidth, kMediumWindowHeight);
+  DoCapture();
+  ValidateFrame(kSmallWindowWidth, kMediumWindowHeight);
+}
+TEST_F(WgcCapturerWinTest, MinimizeWindowMidCapture) {
+  SetUpForWindowCapture();
+  EXPECT_TRUE(capturer_->SelectSource(source_id_));
+  capturer_->Start(this);
+  // Minmize the window and capture should continue but return temporary errors.
+  MinimizeTestWindow(window_info_.hwnd);
+  for (int i = 0; i < 10; ++i) {
+    capturer_->CaptureFrame();
+    EXPECT_EQ(result_, DesktopCapturer::Result::ERROR_TEMPORARY);
+  }
+  // Reopen the window and the capture should continue normally.
+  UnminimizeTestWindow(window_info_.hwnd);
+  DoCapture();
+  // We can't verify the window size here because the test window does not
+  // repaint itself after it is unminimized, but capturing successfully is still
+  // a good test.
+}
+TEST_F(WgcCapturerWinTest, CloseWindowMidCapture) {
+  SetUpForWindowCapture();
+  EXPECT_TRUE(capturer_->SelectSource(source_id_));
+  capturer_->Start(this);
+  DoCapture();
+  ValidateFrame(kMediumWindowWidth, kMediumWindowHeight);
+  CloseTestWindow();
+  // We need to call GetMessage to trigger the Closed event and the capturer's
+  // event handler for it. If we are too early and the Closed event hasn't
+  // arrived yet we should keep trying until the capturer receives it and stops.
+  auto* wgc_capturer = static_cast<WgcCapturerWin*>(capturer_.get());
+  while (wgc_capturer->IsSourceBeingCaptured(source_id_)) {
+    // Since the capturer handles the Closed message, there will be no message
+    // for us and GetMessage will hang, unless we send ourselves a message
+    // first.
+    ::PostThreadMessage(GetCurrentThreadId(), kNoOp, 0, 0);
+    MSG msg;
+    ::GetMessage(&msg, NULL, 0, 0);
+    ::DispatchMessage(&msg);
+  }
+  // Occasionally, one last frame will have made it into the frame pool before
+  // the window closed. The first call will consume it, and in that case we need
+  // to make one more call to CaptureFrame.
+  capturer_->CaptureFrame();
+  if (result_ == DesktopCapturer::Result::SUCCESS)
+    capturer_->CaptureFrame();
+  EXPECT_GE(metrics::NumEvents(kCapturerResultHistogram, kSessionStartFailure),
+            1);
+  EXPECT_GE(metrics::NumEvents(kCaptureSessionResultHistogram, kSourceClosed),
+            1);
+  EXPECT_EQ(result_, DesktopCapturer::Result::ERROR_PERMANENT);
+}
+}  // namespace webrtc

webrtc/wgc_desktop_frame.cc

@@ -0,0 +1,19 @@
+/*
+ *  Copyright (c) 2020 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+#include "modules/desktop_capture/win/wgc_desktop_frame.h"
+#include <utility>
+namespace webrtc {
+WgcDesktopFrame::WgcDesktopFrame(DesktopSize size,
+                                 int stride,
+                                 std::vector<uint8_t>&& image_data)
+    : DesktopFrame(size, stride, image_data.data(), nullptr),
+      image_data_(std::move(image_data)) {}
+WgcDesktopFrame::~WgcDesktopFrame() = default;
+}  // namespace webrtc

webrtc/wgc_desktop_frame.h

@@ -0,0 +1,35 @@
+/*
+ *  Copyright (c) 2020 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+#ifndef MODULES_DESKTOP_CAPTURE_WIN_WGC_DESKTOP_FRAME_H_
+#define MODULES_DESKTOP_CAPTURE_WIN_WGC_DESKTOP_FRAME_H_
+#include <d3d11.h>
+#include <wrl/client.h>
+#include <memory>
+#include <vector>
+#include "desktop_frame.h"
+#include "desktop_geometry.h"
+namespace webrtc {
+// DesktopFrame implementation used by capturers that use the
+// Windows.Graphics.Capture API.
+class WgcDesktopFrame final : public DesktopFrame {
+ public:
+  // WgcDesktopFrame receives an rvalue reference to the |image_data| vector
+  // so that it can take ownership of it (and avoid a copy).
+  WgcDesktopFrame(DesktopSize size,
+                  int stride,
+                  std::vector<uint8_t>&& image_data);
+  WgcDesktopFrame(const WgcDesktopFrame&) = delete;
+  WgcDesktopFrame& operator=(const WgcDesktopFrame&) = delete;
+  ~WgcDesktopFrame() override;
+ private:
+  std::vector<uint8_t> image_data_;
+};
+}  // namespace webrtc
+#endif  // MODULES_DESKTOP_CAPTURE_WIN_WGC_DESKTOP_FRAME_H_

xmake.lua

@@ -35,6 +35,6 @@ target("remote_desk")
     add_packages("log")
     add_packages("ffmpeg")
     add_links("avfilter", "avdevice", "avformat", "avcodec", "swscale", "swresample", "avutil")
-    add_files("*.cpp")
+    add_files("dll/*.cpp")
     add_includedirs("../../src/interface")
     -- add_links("SDL2main", "SDL2-static")