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content / browser / renderer_host / media / in_process_video_capture_device_launcher.cc [blame]
// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/renderer_host/media/in_process_video_capture_device_launcher.h"
#include <utility>
#include <vector>
#include "base/command_line.h"
#include "base/feature_list.h"
#include "base/functional/bind.h"
#include "base/metrics/histogram_functions.h"
#include "base/metrics/histogram_macros.h"
#include "base/task/bind_post_task.h"
#include "base/task/single_thread_task_runner.h"
#include "base/trace_event/trace_event.h"
#include "build/build_config.h"
#include "build/chromeos_buildflags.h"
#include "content/browser/media/capture/native_screen_capture_picker.h"
#include "content/browser/renderer_host/media/in_process_launched_video_capture_device.h"
#include "content/browser/renderer_host/media/video_capture_controller.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/buildflags.h"
#include "content/public/common/content_features.h"
#include "media/base/media_switches.h"
#include "media/capture/video/fake_video_capture_device.h"
#include "media/capture/video/fake_video_capture_device_factory.h"
#include "media/capture/video/video_capture_buffer_pool_impl.h"
#include "media/capture/video/video_capture_buffer_pool_util.h"
#include "media/capture/video/video_capture_buffer_tracker_factory_impl.h"
#include "media/capture/video/video_capture_device_client.h"
#include "media/capture/video/video_frame_receiver.h"
#include "media/capture/video/video_frame_receiver_on_task_runner.h"
#include "services/video_effects/public/mojom/video_effects_processor.mojom-forward.h"
#include "third_party/blink/public/common/mediastream/media_stream_request.h"
#if BUILDFLAG(ENABLE_SCREEN_CAPTURE)
#include "content/browser/media/capture/desktop_capture_device_uma_types.h"
#include "content/browser/media/capture/web_contents_video_capture_device.h"
#if !BUILDFLAG(IS_ANDROID) && !BUILDFLAG(IS_IOS)
#if defined(USE_AURA)
#include "content/browser/media/capture/aura_window_video_capture_device.h"
#endif // defined(USE_AURA)
#include "content/browser/media/capture/desktop_capture_device.h"
#endif // !BUILDFLAG(IS_ANDROID) && !BUILDFLAG(IS_IOS)
#if BUILDFLAG(IS_MAC)
#include "content/browser/media/capture/desktop_capture_device_mac.h"
#include "content/browser/media/capture/screen_capture_kit_device_utils_mac.h"
#include "content/browser/media/capture/views_widget_video_capture_device_mac.h"
#endif
#endif // BUILDFLAG(ENABLE_SCREEN_CAPTURE)
#if BUILDFLAG(IS_CHROMEOS_ASH)
#include "content/browser/gpu/chromeos/video_capture_dependencies.h"
#include "media/capture/video/chromeos/scoped_video_capture_jpeg_decoder.h"
#include "media/capture/video/chromeos/video_capture_jpeg_decoder_impl.h"
#elif BUILDFLAG(IS_WIN)
#include "media/capture/video/win/video_capture_device_factory_win.h"
#endif // BUILDFLAG(IS_CHROMEOS_ASH)
namespace content {
namespace {
#if BUILDFLAG(IS_CHROMEOS_ASH)
std::unique_ptr<media::VideoCaptureJpegDecoder> CreateGpuJpegDecoder(
media::VideoCaptureJpegDecoder::DecodeDoneCB decode_done_cb,
base::RepeatingCallback<void(const std::string&)> send_log_message_cb) {
auto io_task_runner = GetIOThreadTaskRunner({});
return std::make_unique<media::ScopedVideoCaptureJpegDecoder>(
std::make_unique<media::VideoCaptureJpegDecoderImpl>(
base::BindRepeating(
&VideoCaptureDependencies::CreateJpegDecodeAccelerator),
io_task_runner, std::move(decode_done_cb),
std::move(send_log_message_cb)),
io_task_runner);
}
#endif // BUILDFLAG(IS_CHROMEOS_ASH)
#if BUILDFLAG(ENABLE_SCREEN_CAPTURE)
// The maximum number of video frame buffers in-flight at any one time. This
// value should be based on the logical capacity of the capture pipeline, and
// not on hardware performance.
const int kMaxNumberOfBuffers = media::kVideoCaptureDefaultMaxBufferPoolSize;
#if BUILDFLAG(IS_MAC)
BASE_FEATURE(kScreenCaptureKitMac,
"ScreenCaptureKitMac",
base::FEATURE_DISABLED_BY_DEFAULT);
// If this feature is enabled, ScreenCaptureKit will be used for window
// capturing even if kScreenCaptureKitMac is disabled. Please note that this
// feature has no effect if kScreenCaptureKitMac is enabled.
BASE_FEATURE(kScreenCaptureKitMacWindow,
"ScreenCaptureKitMacWindow",
base::FEATURE_ENABLED_BY_DEFAULT);
// If this feature is enabled, ScreenCaptureKit will be used for screen
// capturing even if kScreenCaptureKitMac is disabled. Please note that this
// feature has no effect if kScreenCaptureKitMac is enabled.
BASE_FEATURE(kScreenCaptureKitMacScreen,
"ScreenCaptureKitMacScreen",
base::FEATURE_ENABLED_BY_DEFAULT);
#endif
void IncrementDesktopCaptureCounters(const DesktopMediaID& device_id) {
switch (device_id.type) {
case DesktopMediaID::TYPE_SCREEN:
IncrementDesktopCaptureCounter(SCREEN_CAPTURER_CREATED);
IncrementDesktopCaptureCounter(
device_id.audio_share ? SCREEN_CAPTURER_CREATED_WITH_AUDIO
: SCREEN_CAPTURER_CREATED_WITHOUT_AUDIO);
break;
case DesktopMediaID::TYPE_WINDOW:
IncrementDesktopCaptureCounter(WINDOW_CAPTURER_CREATED);
break;
case DesktopMediaID::TYPE_WEB_CONTENTS:
IncrementDesktopCaptureCounter(TAB_VIDEO_CAPTURER_CREATED);
IncrementDesktopCaptureCounter(
device_id.audio_share ? TAB_VIDEO_CAPTURER_CREATED_WITH_AUDIO
: TAB_VIDEO_CAPTURER_CREATED_WITHOUT_AUDIO);
break;
case DesktopMediaID::TYPE_NONE:
NOTREACHED_IN_MIGRATION();
break;
}
}
// These values are persisted to logs. Entries should not be renumbered and
// numeric values should never be reused.
enum DesktopCaptureImplementation {
kNoImplementation = 0,
kScreenCaptureDeviceAndroid = 1,
kScreenCaptureKitDeviceMac = 2,
kDesktopCaptureDeviceMac = 3,
kLegacyDesktopCaptureDevice = 4,
kImplementationCount = 5,
};
// These values are persisted to logs. Entries should not be renumbered and
// numeric values should never be reused.
enum DesktopCaptureImplementationAndType {
kNoImplementationTypeNone = 0,
kNoImplementationTypeScreen = 1,
kNoImplementationTypeWindow = 2,
kNoImplementationTypeWebContents = 3,
kScreenCaptureDeviceAndroidTypeNone = 4,
kScreenCaptureDeviceAndroidTypeScreen = 5,
kScreenCaptureDeviceAndroidTypeWindow = 6,
kScreenCaptureDeviceAndroidTypeWebContents = 7,
kScreenCaptureKitDeviceMacTypeNone = 8,
kScreenCaptureKitDeviceMacTypeScreen = 9,
kScreenCaptureKitDeviceMacTypeWindow = 10,
kScreenCaptureKitDeviceMacTypeWebContents = 11,
kDesktopCaptureDeviceMacTypeNone = 12,
kDesktopCaptureDeviceMacTypeScreen = 13,
kDesktopCaptureDeviceMacTypeWindow = 14,
kDesktopCaptureDeviceMacTypeWebContents = 15,
kLegacyDesktopCaptureDeviceTypeNone = 16,
kLegacyDesktopCaptureDeviceTypeScreen = 17,
kLegacyDesktopCaptureDeviceTypeWindow = 18,
kLegacyDesktopCaptureDeviceTypeWebContents = 19,
kMaxValue = kLegacyDesktopCaptureDeviceTypeWebContents,
};
void ReportDesktopCaptureImplementationAndType(
DesktopCaptureImplementation implementation,
DesktopMediaID::Type type) {
constexpr int kDesktopIdTypeCount = 4;
static_assert(kDesktopIdTypeCount * kImplementationCount ==
DesktopCaptureImplementationAndType::kMaxValue + 1);
DCHECK_LT(type, kDesktopIdTypeCount);
auto implementation_and_type =
static_cast<DesktopCaptureImplementationAndType>(
implementation * kDesktopIdTypeCount + type);
base::UmaHistogramEnumeration(
"Media.VideoCaptureManager.DesktopCaptureImplementationAndType",
implementation_and_type);
}
DesktopCaptureImplementation CreatePlatformDependentVideoCaptureDevice(
NativeScreenCapturePicker* picker,
const DesktopMediaID& desktop_id,
std::unique_ptr<media::VideoCaptureDevice>& device_out) {
DCHECK_EQ(device_out.get(), nullptr);
#if BUILDFLAG(IS_MAC)
// Use ScreenCaptureKit with picker if specified. `desktop_id` for the picker
// is not compatible with the other implementations.
if (picker) {
device_out = picker->CreateDevice(desktop_id);
if (device_out) {
return kScreenCaptureKitDeviceMac;
}
return kNoImplementation;
}
// Prefer using ScreenCaptureKit. After that try DesktopCaptureDeviceMac, and
// if both fail, use the generic DesktopCaptureDevice.
if (base::FeatureList::IsEnabled(kScreenCaptureKitMac) ||
(desktop_id.type == DesktopMediaID::TYPE_WINDOW &&
base::FeatureList::IsEnabled(kScreenCaptureKitMacWindow)) ||
(desktop_id.type == DesktopMediaID::TYPE_SCREEN &&
base::FeatureList::IsEnabled(kScreenCaptureKitMacScreen))) {
device_out = CreateScreenCaptureKitDeviceMac(desktop_id);
if (device_out) {
return kScreenCaptureKitDeviceMac;
}
}
if ((device_out = CreateDesktopCaptureDeviceMac(desktop_id))) {
return kDesktopCaptureDeviceMac;
}
#endif // BUILDFLAG(IS_MAC)
#if !BUILDFLAG(IS_ANDROID) && !BUILDFLAG(IS_IOS)
if ((device_out = DesktopCaptureDevice::Create(desktop_id))) {
return kLegacyDesktopCaptureDevice;
}
#endif // !BUILDFLAG(IS_ANDROID) && !BUILDFLAG(IS_IOS)
return kNoImplementation;
}
#endif // BUILDFLAG(ENABLE_SCREEN_CAPTURE)
} // anonymous namespace
InProcessVideoCaptureDeviceLauncher::InProcessVideoCaptureDeviceLauncher(
scoped_refptr<base::SingleThreadTaskRunner> device_task_runner,
NativeScreenCapturePicker* picker)
: device_task_runner_(std::move(device_task_runner)),
state_(State::READY_TO_LAUNCH),
native_screen_capture_picker_(picker) {}
InProcessVideoCaptureDeviceLauncher::~InProcessVideoCaptureDeviceLauncher() {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
DCHECK(state_ == State::READY_TO_LAUNCH);
}
void InProcessVideoCaptureDeviceLauncher::LaunchDeviceAsync(
const std::string& device_id,
blink::mojom::MediaStreamType stream_type,
const media::VideoCaptureParams& params,
base::WeakPtr<media::VideoFrameReceiver> receiver_on_io_thread,
base::OnceClosure /* connection_lost_cb */,
Callbacks* callbacks,
base::OnceClosure done_cb,
mojo::PendingRemote<video_effects::mojom::VideoEffectsProcessor>
video_effects_processor) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
DCHECK(state_ == State::READY_TO_LAUNCH);
if (receiver_on_io_thread) {
std::ostringstream string_stream;
string_stream
<< "InProcessVideoCaptureDeviceLauncher::LaunchDeviceAsync: Posting "
"start request to device thread for device_id = "
<< device_id;
receiver_on_io_thread->OnLog(string_stream.str());
}
// Wrap the receiver, to trampoline all its method calls from the device
// to the IO thread.
auto receiver = std::make_unique<media::VideoFrameReceiverOnTaskRunner>(
receiver_on_io_thread, GetIOThreadTaskRunner({}));
base::OnceClosure start_capture_closure;
// Use of Unretained |this| is safe, because |done_cb| guarantees that |this|
// stays alive.
ReceiveDeviceCallback after_start_capture_callback =
base::BindPostTaskToCurrentDefault(base::BindOnce(
&InProcessVideoCaptureDeviceLauncher::OnDeviceStarted,
base::Unretained(this), callbacks, std::move(done_cb)));
switch (stream_type) {
case blink::mojom::MediaStreamType::DEVICE_VIDEO_CAPTURE:
// Only the Service-based device launcher is supported for device capture
// from cameras etc.
NOTREACHED();
#if BUILDFLAG(ENABLE_SCREEN_CAPTURE)
case blink::mojom::MediaStreamType::GUM_TAB_VIDEO_CAPTURE:
start_capture_closure = base::BindOnce(
&InProcessVideoCaptureDeviceLauncher::DoStartTabCaptureOnDeviceThread,
base::Unretained(this), device_id, params, std::move(receiver),
std::move(after_start_capture_callback));
break;
case blink::mojom::MediaStreamType::GUM_DESKTOP_VIDEO_CAPTURE:
case blink::mojom::MediaStreamType::DISPLAY_VIDEO_CAPTURE:
case blink::mojom::MediaStreamType::DISPLAY_VIDEO_CAPTURE_THIS_TAB:
case blink::mojom::MediaStreamType::DISPLAY_VIDEO_CAPTURE_SET: {
const DesktopMediaID desktop_id = DesktopMediaID::Parse(device_id);
if (desktop_id.is_null()) {
DLOG(ERROR) << "Desktop media ID is null";
start_capture_closure =
base::BindOnce(std::move(after_start_capture_callback), nullptr);
break;
}
if (desktop_id.id == DesktopMediaID::kFakeId) {
start_capture_closure = base::BindOnce(
&InProcessVideoCaptureDeviceLauncher::
DoStartFakeDisplayCaptureOnDeviceThread,
base::Unretained(this), desktop_id, params,
CreateDeviceClient(media::VideoCaptureBufferType::kSharedMemory,
kMaxNumberOfBuffers, std::move(receiver),
std::move(receiver_on_io_thread)),
std::move(after_start_capture_callback));
break;
}
if (desktop_id.type == DesktopMediaID::TYPE_WEB_CONTENTS) {
after_start_capture_callback = base::BindOnce(
[](const DesktopMediaID& device_id, ReceiveDeviceCallback callback,
std::unique_ptr<media::VideoCaptureDevice> device) {
// Special case: Only call IncrementDesktopCaptureCounters()
// for WebContents capture if it was started from a desktop
// capture API.
if (device) {
IncrementDesktopCaptureCounters(device_id);
}
std::move(callback).Run(std::move(device));
},
desktop_id, std::move(after_start_capture_callback));
start_capture_closure = base::BindOnce(
&InProcessVideoCaptureDeviceLauncher::
DoStartTabCaptureOnDeviceThread,
base::Unretained(this), device_id, params, std::move(receiver),
std::move(after_start_capture_callback));
break;
}
#if defined(USE_AURA) || BUILDFLAG(IS_MAC)
if (desktop_id.window_id != DesktopMediaID::kNullId) {
// For the other capturers, when a bug reports the type of capture it's
// easy enough to determine which capturer was used, but it's a little
// fuzzier with window capture.
TRACE_EVENT_INSTANT0(
TRACE_DISABLED_BY_DEFAULT("video_and_image_capture"),
"UsingVizFrameSinkCapturer", TRACE_EVENT_SCOPE_THREAD);
start_capture_closure = base::BindOnce(
&InProcessVideoCaptureDeviceLauncher::
DoStartVizFrameSinkWindowCaptureOnDeviceThread,
base::Unretained(this), desktop_id, params, std::move(receiver),
std::move(after_start_capture_callback));
break;
}
#endif // defined(USE_AURA) || BUILDFLAG(IS_MAC)
// All cases other than tab capture or Aura desktop/window capture.
TRACE_EVENT_INSTANT0(TRACE_DISABLED_BY_DEFAULT("video_and_image_capture"),
"UsingDesktopCapturer", TRACE_EVENT_SCOPE_THREAD);
start_capture_closure = base::BindOnce(
&InProcessVideoCaptureDeviceLauncher::
DoStartDesktopCaptureOnDeviceThread,
base::Unretained(this), desktop_id, params,
CreateDeviceClient(media::VideoCaptureBufferType::kSharedMemory,
kMaxNumberOfBuffers, std::move(receiver),
std::move(receiver_on_io_thread)),
std::move(after_start_capture_callback));
break;
}
#endif // BUILDFLAG(ENABLE_SCREEN_CAPTURE)
default:
NOTREACHED_IN_MIGRATION() << "unsupported stream type=" << stream_type;
start_capture_closure =
base::BindOnce(std::move(after_start_capture_callback), nullptr);
}
state_ = State::DEVICE_START_IN_PROGRESS;
device_task_runner_->PostTask(FROM_HERE, std::move(start_capture_closure));
}
void InProcessVideoCaptureDeviceLauncher::AbortLaunch() {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
if (state_ == State::DEVICE_START_IN_PROGRESS)
state_ = State::DEVICE_START_ABORTING;
}
std::unique_ptr<media::VideoCaptureDeviceClient>
InProcessVideoCaptureDeviceLauncher::CreateDeviceClient(
media::VideoCaptureBufferType requested_buffer_type,
int buffer_pool_max_buffer_count,
std::unique_ptr<media::VideoFrameReceiver> receiver,
base::WeakPtr<media::VideoFrameReceiver> receiver_on_io_thread) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
#if BUILDFLAG(IS_WIN)
scoped_refptr<media::VideoCaptureBufferPool> buffer_pool =
base::MakeRefCounted<media::VideoCaptureBufferPoolImpl>(
requested_buffer_type, buffer_pool_max_buffer_count,
std::make_unique<media::VideoCaptureBufferTrackerFactoryImpl>(
/*dxgi_device_manager=*/nullptr));
#else
scoped_refptr<media::VideoCaptureBufferPool> buffer_pool =
base::MakeRefCounted<media::VideoCaptureBufferPoolImpl>(
requested_buffer_type, buffer_pool_max_buffer_count);
#endif
#if BUILDFLAG(IS_CHROMEOS_ASH)
return std::make_unique<media::VideoCaptureDeviceClient>(
std::move(receiver), std::move(buffer_pool),
base::BindRepeating(
&CreateGpuJpegDecoder,
base::BindRepeating(&media::VideoFrameReceiver::OnFrameReadyInBuffer,
receiver_on_io_thread),
base::BindRepeating(&media::VideoFrameReceiver::OnLog,
receiver_on_io_thread)));
#else
return std::make_unique<media::VideoCaptureDeviceClient>(
std::move(receiver), std::move(buffer_pool),
media::VideoEffectsContext({}));
#endif // BUILDFLAG(IS_CHROMEOS_ASH)
}
void InProcessVideoCaptureDeviceLauncher::OnDeviceStarted(
Callbacks* callbacks,
base::OnceClosure done_cb,
std::unique_ptr<media::VideoCaptureDevice> device) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
State state_copy = state_;
state_ = State::READY_TO_LAUNCH;
if (!device) {
switch (state_copy) {
case State::DEVICE_START_IN_PROGRESS:
callbacks->OnDeviceLaunchFailed(
media::VideoCaptureError::
kInProcessDeviceLauncherFailedToCreateDeviceInstance);
std::move(done_cb).Run();
return;
case State::DEVICE_START_ABORTING:
callbacks->OnDeviceLaunchAborted();
std::move(done_cb).Run();
return;
case State::READY_TO_LAUNCH:
NOTREACHED();
}
}
auto launched_device = std::make_unique<InProcessLaunchedVideoCaptureDevice>(
std::move(device), device_task_runner_);
switch (state_copy) {
case State::DEVICE_START_IN_PROGRESS:
callbacks->OnDeviceLaunched(std::move(launched_device));
std::move(done_cb).Run();
return;
case State::DEVICE_START_ABORTING:
launched_device.reset();
callbacks->OnDeviceLaunchAborted();
std::move(done_cb).Run();
return;
case State::READY_TO_LAUNCH:
NOTREACHED();
}
}
#if BUILDFLAG(ENABLE_SCREEN_CAPTURE)
void InProcessVideoCaptureDeviceLauncher::DoStartTabCaptureOnDeviceThread(
const std::string& device_id,
const media::VideoCaptureParams& params,
std::unique_ptr<media::VideoFrameReceiver> receiver,
ReceiveDeviceCallback result_callback) {
DCHECK(device_task_runner_->BelongsToCurrentThread());
std::unique_ptr<WebContentsVideoCaptureDevice> video_capture_device =
WebContentsVideoCaptureDevice::Create(device_id);
if (video_capture_device) {
video_capture_device->AllocateAndStartWithReceiver(params,
std::move(receiver));
}
std::move(result_callback).Run(std::move(video_capture_device));
}
#if defined(USE_AURA) || BUILDFLAG(IS_MAC)
void InProcessVideoCaptureDeviceLauncher::
DoStartVizFrameSinkWindowCaptureOnDeviceThread(
const DesktopMediaID& device_id,
const media::VideoCaptureParams& params,
std::unique_ptr<media::VideoFrameReceiver> receiver,
ReceiveDeviceCallback result_callback) {
DCHECK(device_task_runner_->BelongsToCurrentThread());
std::unique_ptr<FrameSinkVideoCaptureDevice> video_capture_device;
#if defined(USE_AURA)
video_capture_device =
std::make_unique<AuraWindowVideoCaptureDevice>(device_id);
#elif BUILDFLAG(IS_MAC)
video_capture_device =
std::make_unique<ViewsWidgetVideoCaptureDeviceMac>(device_id);
#endif
if (video_capture_device) {
video_capture_device->AllocateAndStartWithReceiver(params,
std::move(receiver));
IncrementDesktopCaptureCounters(device_id);
}
std::move(result_callback).Run(std::move(video_capture_device));
}
#endif // defined(USE_AURA) || BUILDFLAG(IS_MAC)
void InProcessVideoCaptureDeviceLauncher::DoStartDesktopCaptureOnDeviceThread(
const DesktopMediaID& desktop_id,
const media::VideoCaptureParams& params,
std::unique_ptr<media::VideoCaptureDeviceClient> device_client,
ReceiveDeviceCallback result_callback) {
DCHECK(device_task_runner_->BelongsToCurrentThread());
DCHECK(!desktop_id.is_null());
std::unique_ptr<media::VideoCaptureDevice> video_capture_device;
DesktopCaptureImplementation implementation =
CreatePlatformDependentVideoCaptureDevice(
native_screen_capture_picker_, desktop_id, video_capture_device);
DVLOG(1) << __func__ << " implementation " << implementation << " type "
<< desktop_id.type;
ReportDesktopCaptureImplementationAndType(implementation, desktop_id.type);
if (video_capture_device)
video_capture_device->AllocateAndStart(params, std::move(device_client));
std::move(result_callback).Run(std::move(video_capture_device));
}
#endif // BUILDFLAG(ENABLE_SCREEN_CAPTURE)
void InProcessVideoCaptureDeviceLauncher::
DoStartFakeDisplayCaptureOnDeviceThread(
const DesktopMediaID& desktop_id,
const media::VideoCaptureParams& params,
std::unique_ptr<media::VideoCaptureDeviceClient> device_client,
ReceiveDeviceCallback result_callback) {
DCHECK(device_task_runner_->BelongsToCurrentThread());
DCHECK_EQ(DesktopMediaID::kFakeId, desktop_id.id);
fake_device_factory_ =
std::make_unique<media::FakeVideoCaptureDeviceFactory>();
const base::CommandLine* command_line =
base::CommandLine::ForCurrentProcess();
if (command_line &&
command_line->HasSwitch(switches::kUseFakeDeviceForMediaStream)) {
std::vector<media::FakeVideoCaptureDeviceSettings> config;
media::FakeVideoCaptureDeviceFactory::
ParseFakeDevicesConfigFromOptionsString(
command_line->GetSwitchValueASCII(
switches::kUseFakeDeviceForMediaStream),
&config);
fake_device_factory_->SetToCustomDevicesConfig(config);
}
// base::Unretained() is safe because |this| owns |fake_device_factory_|.
fake_device_factory_->GetDevicesInfo(base::BindOnce(
&InProcessVideoCaptureDeviceLauncher::OnFakeDevicesEnumerated,
base::Unretained(this), params, std::move(device_client),
std::move(result_callback)));
}
void InProcessVideoCaptureDeviceLauncher::OnFakeDevicesEnumerated(
const media::VideoCaptureParams& params,
std::unique_ptr<media::VideoCaptureDeviceClient> device_client,
ReceiveDeviceCallback result_callback,
std::vector<media::VideoCaptureDeviceInfo> devices_info) {
DCHECK(device_task_runner_->BelongsToCurrentThread());
if (devices_info.empty()) {
LOG(ERROR) << "Cannot start with no fake device config";
std::move(result_callback).Run(nullptr);
return;
}
auto video_capture_device =
fake_device_factory_->CreateDevice(devices_info.front().descriptor)
.ReleaseDevice();
video_capture_device->AllocateAndStart(params, std::move(device_client));
std::move(result_callback).Run(std::move(video_capture_device));
}
} // namespace content