modules/desktop_capture/win/wgc_capturer_win.cc

/*
 *  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 <DispatcherQueue.h>
#include <windows.foundation.metadata.h>
#include <windows.graphics.capture.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 "rtc_base/win/get_activation_factory.h"
#include "rtc_base/win/hstring.h"
#include "rtc_base/win/windows_version.h"
#include "system_wrappers/include/metrics.h"

namespace WGC = ABI::Windows::Graphics::Capture;
using Microsoft::WRL::ComPtr;

namespace webrtc {

namespace {

constexpr wchar_t kCoreMessagingDll[] = L"CoreMessaging.dll";

constexpr wchar_t kWgcSessionType[] =
    L"Windows.Graphics.Capture.GraphicsCaptureSession";
constexpr wchar_t kApiContract[] = L"Windows.Foundation.UniversalApiContract";
constexpr UINT16 kRequiredApiContractVersion = 8;

enum class WgcCapturerResult {
  kSuccess = 0,
  kNoDirect3dDevice = 1,
  kNoSourceSelected = 2,
  kItemCreationFailure = 3,
  kSessionStartFailure = 4,
  kGetFrameFailure = 5,
  kFrameDropped = 6,
  kCreateDispatcherQueueFailure = 7,
  kMaxValue = kCreateDispatcherQueueFailure
};

void RecordWgcCapturerResult(WgcCapturerResult error) {
  RTC_HISTOGRAM_ENUMERATION("WebRTC.DesktopCapture.Win.WgcCapturerResult",
                            static_cast<int>(error),
                            static_cast<int>(WgcCapturerResult::kMaxValue));
}

}  // namespace

bool IsWgcSupported(CaptureType capture_type) {
  if (!HasActiveDisplay()) {
    // There is a bug in `CreateForMonitor` that causes a crash if there are no
    // active displays. The crash was fixed in Win11, but we are still unable
    // to capture screens without an active display.
    if (capture_type == CaptureType::kScreen)
      return false;

    // There is a bug in the DWM (Desktop Window Manager) that prevents it from
    // providing image data if there are no displays attached. This was fixed in
    // Windows 11.
    if (rtc::rtc_win::GetVersion() < rtc::rtc_win::Version::VERSION_WIN11)
      return false;
  }

  // A bug in the WGC API `CreateForMonitor` prevents capturing the entire
  // virtual screen (all monitors simultaneously), this was fixed in 20H1. Since
  // we can't assert that we won't be asked to capture the entire virtual
  // screen, we report unsupported so we can fallback to another capturer.
  if (capture_type == CaptureType::kScreen &&
      rtc::rtc_win::GetVersion() < rtc::rtc_win::Version::VERSION_WIN10_20H1) {
    return false;
  }

  if (!ResolveCoreWinRTDelayload())
    return false;

  // We need to check if the WGC APIs are presesnt on the system. Certain SKUs
  // of Windows ship without these APIs.
  ComPtr<ABI::Windows::Foundation::Metadata::IApiInformationStatics>
      api_info_statics;
  HRESULT hr = GetActivationFactory<
      ABI::Windows::Foundation::Metadata::IApiInformationStatics,
      RuntimeClass_Windows_Foundation_Metadata_ApiInformation>(
      &api_info_statics);
  if (FAILED(hr))
    return false;

  HSTRING api_contract;
  hr = webrtc::CreateHstring(kApiContract, wcslen(kApiContract), &api_contract);
  if (FAILED(hr))
    return false;

  boolean is_api_present;
  hr = api_info_statics->IsApiContractPresentByMajor(
      api_contract, kRequiredApiContractVersion, &is_api_present);
  webrtc::DeleteHstring(api_contract);
  if (FAILED(hr) || !is_api_present)
    return false;

  HSTRING wgc_session_type;
  hr = webrtc::CreateHstring(kWgcSessionType, wcslen(kWgcSessionType),
                             &wgc_session_type);
  if (FAILED(hr))
    return false;

  boolean is_type_present;
  hr = api_info_statics->IsTypePresent(wgc_session_type, &is_type_present);
  webrtc::DeleteHstring(wgc_session_type);
  if (FAILED(hr) || !is_type_present)
    return false;

  // If the APIs are present, we need to check that they are supported.
  ComPtr<WGC::IGraphicsCaptureSessionStatics> capture_session_statics;
  hr = GetActivationFactory<
      WGC::IGraphicsCaptureSessionStatics,
      RuntimeClass_Windows_Graphics_Capture_GraphicsCaptureSession>(
      &capture_session_statics);
  if (FAILED(hr))
    return false;

  boolean is_supported;
  hr = capture_session_statics->IsSupported(&is_supported);
  if (FAILED(hr) || !is_supported)
    return false;

  return true;
}

WgcCapturerWin::WgcCapturerWin(
    std::unique_ptr<WgcCaptureSourceFactory> source_factory,
    std::unique_ptr<SourceEnumerator> source_enumerator,
    bool allow_delayed_capturable_check)
    : source_factory_(std::move(source_factory)),
      source_enumerator_(std::move(source_enumerator)),
      allow_delayed_capturable_check_(allow_delayed_capturable_check) {
  if (!core_messaging_library_)
    core_messaging_library_ = LoadLibraryW(kCoreMessagingDll);

  if (core_messaging_library_) {
    create_dispatcher_queue_controller_func_ =
        reinterpret_cast<CreateDispatcherQueueControllerFunc>(GetProcAddress(
            core_messaging_library_, "CreateDispatcherQueueController"));
  }
}

WgcCapturerWin::~WgcCapturerWin() {
  if (core_messaging_library_)
    FreeLibrary(core_messaging_library_);
}

// static
std::unique_ptr<DesktopCapturer> WgcCapturerWin::CreateRawWindowCapturer(
    const DesktopCaptureOptions& options,
    bool allow_delayed_capturable_check) {
  return std::make_unique<WgcCapturerWin>(
      std::make_unique<WgcWindowSourceFactory>(),
      std::make_unique<WindowEnumerator>(
          options.enumerate_current_process_windows()),
      allow_delayed_capturable_check);
}

// static
std::unique_ptr<DesktopCapturer> WgcCapturerWin::CreateRawScreenCapturer(
    const DesktopCaptureOptions& options) {
  return std::make_unique<WgcCapturerWin>(
      std::make_unique<WgcScreenSourceFactory>(),
      std::make_unique<ScreenEnumerator>(), false);
}

bool WgcCapturerWin::GetSourceList(SourceList* sources) {
  return source_enumerator_->FindAllSources(sources);
}

bool WgcCapturerWin::SelectSource(DesktopCapturer::SourceId id) {
  capture_source_ = source_factory_->CreateCaptureSource(id);
  if (allow_delayed_capturable_check_)
    return true;

  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;
  }

  if (allow_delayed_capturable_check_ && !capture_source_->IsCapturable()) {
    RTC_LOG(LS_ERROR) << "Source is not capturable.";
    callback_->OnCaptureResult(DesktopCapturer::Result::ERROR_PERMANENT,
                               /*frame=*/nullptr);
    return;
  }

  HRESULT hr;
  if (!dispatcher_queue_created_) {
    // Set the apartment type to NONE because this thread should already be COM
    // initialized.
    DispatcherQueueOptions options{
        sizeof(DispatcherQueueOptions),
        DISPATCHERQUEUE_THREAD_TYPE::DQTYPE_THREAD_CURRENT,
        DISPATCHERQUEUE_THREAD_APARTMENTTYPE::DQTAT_COM_NONE};
    ComPtr<ABI::Windows::System::IDispatcherQueueController> queue_controller;
    hr = create_dispatcher_queue_controller_func_(options, &queue_controller);

    // If there is already a DispatcherQueue on this thread, that is fine. Its
    // lifetime is tied to the thread's, and as long as the thread has one, even
    // if we didn't create it, the capture session's events will be delivered on
    // this thread.
    if (FAILED(hr) && hr != RPC_E_WRONG_THREAD) {
      RecordWgcCapturerResult(WgcCapturerResult::kCreateDispatcherQueueFailure);
      callback_->OnCaptureResult(DesktopCapturer::Result::ERROR_PERMANENT,
                                 /*frame=*/nullptr);
    } else {
      dispatcher_queue_created_ = true;
    }
  }

  int64_t capture_start_time_nanos = rtc::TimeNanos();

  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,
                                  capture_source_->GetSize()));
    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