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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/media/webrtc/chrome_screen_enumerator.h"
#include <tuple>
#include "base/feature_list.h"
#include "base/lazy_instance.h"
#include "base/task/bind_post_task.h"
#include "build/build_config.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/desktop_media_id.h"
#include "content/public/common/content_features.h"
#include "third_party/blink/public/common/features_generated.h"
#include "third_party/blink/public/mojom/mediastream/media_stream.mojom.h"
#include "ui/display/screen.h"
#if BUILDFLAG(IS_CHROMEOS)
#include "ash/shell.h"
#include "ui/aura/window.h"
#elif BUILDFLAG(IS_LINUX)
#include "base/functional/callback.h"
#include "content/public/browser/desktop_capture.h"
#endif
#if BUILDFLAG(IS_CHROMEOS)
namespace {
base::LazyInstance<std::vector<raw_ptr<aura::Window, VectorExperimental>>>::
DestructorAtExit root_windows_for_testing_ = LAZY_INSTANCE_INITIALIZER;
} // namespace
#elif BUILDFLAG(IS_LINUX)
namespace {
base::LazyInstance<std::unique_ptr<webrtc::DesktopCapturer>>::DestructorAtExit
g_desktop_capturer_for_testing = LAZY_INSTANCE_INITIALIZER;
} // namespace
#endif
namespace {
#if BUILDFLAG(IS_CHROMEOS)
blink::mojom::StreamDevicesSetPtr EnumerateScreens(
blink::mojom::MediaStreamType stream_type) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
aura::Window::Windows root_windows =
(root_windows_for_testing_.IsCreated())
? std::move(root_windows_for_testing_.Get())
: ash::Shell::GetAllRootWindows();
display::Screen* screen = display::Screen::GetScreen();
blink::mojom::StreamDevicesSetPtr stream_devices_set =
blink::mojom::StreamDevicesSet::New();
for (aura::Window* window : root_windows) {
content::DesktopMediaID media_id =
content::DesktopMediaID::RegisterNativeWindow(
content::DesktopMediaID::TYPE_SCREEN, window);
DCHECK_EQ(content::DesktopMediaID::Type::TYPE_SCREEN, media_id.type);
// Add selected desktop source to the list.
blink::MediaStreamDevice device(
stream_type, /*id=*/media_id.ToString(),
/*name=*/"Screen",
/*display_id=*/
screen->GetDisplayNearestWindow(window).id());
device.display_media_info = media::mojom::DisplayMediaInformation::New(
/*display_surface=*/media::mojom::DisplayCaptureSurfaceType::MONITOR,
/*logical_surface=*/true,
/*cursor=*/media::mojom::CursorCaptureType::NEVER,
/*capture_handle=*/nullptr,
/*initial_zoom_level=*/100);
stream_devices_set->stream_devices.push_back(
blink::mojom::StreamDevices::New(/*audio_device=*/std::nullopt,
/*video_device=*/device));
}
return stream_devices_set;
}
#elif BUILDFLAG(IS_LINUX)
blink::mojom::StreamDevicesSetPtr EnumerateScreens(
blink::mojom::MediaStreamType stream_type) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
blink::mojom::StreamDevicesSetPtr stream_devices_set =
blink::mojom::StreamDevicesSet::New();
std::unique_ptr<webrtc::DesktopCapturer> capturer =
(g_desktop_capturer_for_testing.IsCreated())
? std::move(g_desktop_capturer_for_testing.Get())
: content::desktop_capture::CreateScreenCapturer(
content::desktop_capture::CreateDesktopCaptureOptions(),
/*for_snapshot=*/true);
if (!capturer) {
return stream_devices_set;
}
capturer->Start(/*callback=*/nullptr);
webrtc::DesktopCapturer::SourceList source_list;
if (!capturer->GetSourceList(&source_list)) {
return stream_devices_set;
}
for (const auto& source : source_list) {
const std::string media_id =
content::DesktopMediaID(content::DesktopMediaID::Type::TYPE_SCREEN,
source.id)
.ToString();
blink::MediaStreamDevice device(stream_type, media_id,
/*name=*/"Screen",
/*display_id=*/source.display_id);
stream_devices_set->stream_devices.push_back(
blink::mojom::StreamDevices::New(/*audio_device=*/std::nullopt,
/*video_device=*/device));
}
return stream_devices_set;
}
#endif
} // namespace
ChromeScreenEnumerator::ChromeScreenEnumerator() = default;
ChromeScreenEnumerator::~ChromeScreenEnumerator() = default;
#if BUILDFLAG(IS_CHROMEOS)
void ChromeScreenEnumerator::SetRootWindowsForTesting(
std::vector<raw_ptr<aura::Window, VectorExperimental>> root_windows) {
root_windows_for_testing_.Get() = std::move(root_windows);
}
#elif BUILDFLAG(IS_LINUX)
void ChromeScreenEnumerator::SetDesktopCapturerForTesting(
std::unique_ptr<webrtc::DesktopCapturer> capturer) {
g_desktop_capturer_for_testing.Get() = std::move(capturer);
}
#endif // BUILDFLAG(IS_LINUX)
void ChromeScreenEnumerator::EnumerateScreens(
blink::mojom::MediaStreamType stream_type,
ScreensCallback screens_callback) const {
DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
#if BUILDFLAG(IS_CHROMEOS) || BUILDFLAG(IS_LINUX)
content::GetUIThreadTaskRunner({})->PostTaskAndReplyWithResult(
FROM_HERE, base::BindOnce(::EnumerateScreens, stream_type),
base::BindOnce(
[](ScreensCallback screens_callback,
blink::mojom::StreamDevicesSetPtr stream_devices_set) {
std::move(screens_callback)
.Run(*stream_devices_set,
stream_devices_set->stream_devices.size() > 0
? blink::mojom::MediaStreamRequestResult::OK
: blink::mojom::MediaStreamRequestResult::NO_HARDWARE);
},
std::move(screens_callback)));
#else
// TODO(crbug.com/40216442): Implement for other platforms than Chrome OS.
NOTREACHED();
#endif
}
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