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/*
* 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(
const DesktopCaptureOptions& options,
std::unique_ptr<WgcCaptureSourceFactory> source_factory,
std::unique_ptr<SourceEnumerator> source_enumerator,
bool allow_delayed_capturable_check)
: options_(options),
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>(
options, 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>(
options, 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(options_);
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;
if (!capture_session->GetFrame(&frame,
capture_source_->ShouldBeCapturable())) {
RTC_LOG(LS_ERROR) << "GetFrame failed.";
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(options_.prefer_cursor_embedded());
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