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playwright/browser_patches/firefox/juggler/screencast/nsScreencastService.cpp

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsScreencastService.h"
#include "ScreencastEncoder.h"
#include "HeadlessWidget.h"
#include "HeadlessWindowCapturer.h"
#include "mozilla/Base64.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/PresShell.h"
#include "mozilla/StaticPtr.h"
#include "nsIDocShell.h"
#include "nsIObserverService.h"
#include "nsIRandomGenerator.h"
#include "nsISupportsPrimitives.h"
#include "nsThreadManager.h"
#include "nsReadableUtils.h"
#include "nsView.h"
#include "nsViewManager.h"
#include "webrtc/modules/desktop_capture/desktop_capturer.h"
#include "webrtc/modules/desktop_capture/desktop_capture_options.h"
#include "webrtc/modules/desktop_capture/desktop_device_info.h"
#include "webrtc/modules/desktop_capture/desktop_frame.h"
#include "webrtc/modules/video_capture/video_capture.h"
#include "mozilla/widget/PlatformWidgetTypes.h"
#include "video_engine/desktop_capture_impl.h"
extern "C" {
#include "jpeglib.h"
}
using namespace mozilla::widget;
namespace mozilla {
NS_IMPL_ISUPPORTS(nsScreencastService, nsIScreencastService)
namespace {
const int kMaxFramesInFlight = 1;
StaticRefPtr<nsScreencastService> gScreencastService;
rtc::scoped_refptr<webrtc::VideoCaptureModuleEx> CreateWindowCapturer(nsIWidget* widget) {
if (gfxPlatform::IsHeadless()) {
HeadlessWidget* headlessWidget = static_cast<HeadlessWidget*>(widget);
return HeadlessWindowCapturer::Create(headlessWidget);
}
uintptr_t rawWindowId = reinterpret_cast<uintptr_t>(widget->GetNativeData(NS_NATIVE_WINDOW_WEBRTC_DEVICE_ID));
if (!rawWindowId) {
fprintf(stderr, "Failed to get native window id\n");
return nullptr;
}
nsCString windowId;
windowId.AppendPrintf("%" PRIuPTR, rawWindowId);
bool captureCursor = false;
static int moduleId = 0;
return webrtc::DesktopCaptureImpl::Create(++moduleId, windowId.get(), webrtc::CaptureDeviceType::Window, captureCursor);
}
void NotifyScreencastStopped(const nsString& sessionId) {
nsCOMPtr<nsIObserverService> observerService = mozilla::services::GetObserverService();
if (!observerService) {
fprintf(stderr, "NotifyScreencastStopped error: no observer service\n");
return;
}
observerService->NotifyObservers(nullptr, "juggler-screencast-stopped", sessionId.get());
}
void NotifyScreencastFrame(const nsCString& frameData) {
nsString wideString;
CopyASCIItoUTF16(frameData, wideString);
nsCOMPtr<nsIObserverService> observerService = mozilla::services::GetObserverService();
if (!observerService) {
fprintf(stderr, "NotifyScreencastFrame error: no observer service\n");
return;
}
observerService->NotifyObservers(nullptr, "juggler-screencast-frame", wideString.get());
}
nsresult generateUid(nsString& uid) {
nsresult rv = NS_OK;
nsCOMPtr<nsIRandomGenerator> rg = do_GetService("@mozilla.org/security/random-generator;1", &rv);
NS_ENSURE_SUCCESS(rv, rv);
uint8_t* buffer;
const int kLen = 16;
rv = rg->GenerateRandomBytes(kLen, &buffer);
NS_ENSURE_SUCCESS(rv, rv);
for (int i = 0; i < kLen; i++) {
uid.AppendPrintf("%02x", buffer[i]);
}
free(buffer);
return rv;
}
}
class nsScreencastService::Session : public rtc::VideoSinkInterface<webrtc::VideoFrame>,
public webrtc::RawFrameCallback {
public:
Session(rtc::scoped_refptr<webrtc::VideoCaptureModuleEx>&& capturer, RefPtr<ScreencastEncoder>&& encoder, gfx::IntMargin margin, uint32_t jpegQuality)
: mCaptureModule(std::move(capturer))
, mEncoder(std::move(encoder))
, mJpegQuality(jpegQuality)
, mMargin(margin) {
}
bool Start() {
webrtc::VideoCaptureCapability capability;
// The size is ignored in fact.
capability.width = 1280;
capability.height = 960;
capability.maxFPS = ScreencastEncoder::fps;
capability.videoType = webrtc::VideoType::kI420;
int error = mCaptureModule->StartCapture(capability);
if (error) {
fprintf(stderr, "StartCapture error %d\n", error);
return false;
}
if (mEncoder)
mCaptureModule->RegisterCaptureDataCallback(this);
else
mCaptureModule->RegisterRawFrameCallback(this);
return true;
}
void Stop(std::function<void()>&& callback) {
if (mEncoder)
mCaptureModule->DeRegisterCaptureDataCallback(this);
else
mCaptureModule->RegisterRawFrameCallback(this);
int error = mCaptureModule->StopCapture();
if (error) {
fprintf(stderr, "StopCapture error %d\n", error);
}
if (mEncoder)
mEncoder->finish(std::move(callback));
else
callback();
}
void ScreencastFrameAck() {
rtc::CritScope lock(&mFramesInFlightCs);
--mFramesInFlight;
}
// These callbacks end up running on the VideoCapture thread.
void OnFrame(const webrtc::VideoFrame& videoFrame) override {
if (!mEncoder)
return;
mEncoder->encodeFrame(videoFrame);
}
// These callbacks end up running on the VideoCapture thread.
void OnRawFrame(uint8_t* videoFrame, size_t videoFrameStride, const webrtc::VideoCaptureCapability& frameInfo) override {
if (!mJpegQuality)
return;
{
rtc::CritScope lock(&mFramesInFlightCs);
if (mFramesInFlight >= kMaxFramesInFlight)
return;
++mFramesInFlight;
}
jpeg_compress_struct info;
jpeg_error_mgr error;
info.err = jpeg_std_error(&error);
jpeg_create_compress(&info);
unsigned char* bufferPtr = nullptr;
unsigned long bufferSize;
jpeg_mem_dest(&info, &bufferPtr, &bufferSize);
info.image_width = frameInfo.width - mMargin.LeftRight();
info.image_height = frameInfo.height - mMargin.TopBottom();
#if MOZ_LITTLE_ENDIAN()
if (frameInfo.videoType == webrtc::VideoType::kARGB)
info.in_color_space = JCS_EXT_BGRA;
if (frameInfo.videoType == webrtc::VideoType::kBGRA)
info.in_color_space = JCS_EXT_ARGB;
#else
if (frameInfo.videoType == webrtc::VideoType::kARGB)
info.in_color_space = JCS_EXT_ARGB;
if (frameInfo.videoType == webrtc::VideoType::kBGRA)
info.in_color_space = JCS_EXT_BGRA;
#endif
// # of color components in input image
info.input_components = 4;
jpeg_set_defaults(&info);
jpeg_set_quality(&info, mJpegQuality, true);
jpeg_start_compress(&info, true);
while (info.next_scanline < info.image_height) {
JSAMPROW row = videoFrame + (mMargin.top + info.next_scanline) * videoFrameStride + 4 * mMargin.left;
if (jpeg_write_scanlines(&info, &row, 1) != 1) {
fprintf(stderr, "JPEG library failed to encode line\n");
break;
}
}
jpeg_finish_compress(&info);
jpeg_destroy_compress(&info);
nsCString base64;
nsresult rv = mozilla::Base64Encode(reinterpret_cast<char *>(bufferPtr), bufferSize, base64);
if (NS_WARN_IF(NS_FAILED(rv)))
return;
NS_DispatchToMainThread(NS_NewRunnableFunction(
"NotifyScreencastFrame", [base64]() -> void {
NotifyScreencastFrame(base64);
}));
free(bufferPtr);
}
private:
rtc::scoped_refptr<webrtc::VideoCaptureModuleEx> mCaptureModule;
RefPtr<ScreencastEncoder> mEncoder;
uint32_t mJpegQuality;
rtc::CriticalSection mFramesInFlightCs;
uint32_t mFramesInFlight = 0;
gfx::IntMargin mMargin;
};
// static
already_AddRefed<nsIScreencastService> nsScreencastService::GetSingleton() {
if (gScreencastService) {
return do_AddRef(gScreencastService);
}
gScreencastService = new nsScreencastService();
// ClearOnShutdown(&gScreencastService);
return do_AddRef(gScreencastService);
}
nsScreencastService::nsScreencastService() = default;
nsScreencastService::~nsScreencastService() {
}
nsresult nsScreencastService::StartVideoRecording(nsIDocShell* aDocShell, bool isVideo, const nsACString& aVideoFileName, uint32_t width, uint32_t height, uint32_t quality, int32_t offsetTop, nsAString& sessionId) {
MOZ_RELEASE_ASSERT(NS_IsMainThread(), "Screencast service must be started on the Main thread.");
PresShell* presShell = aDocShell->GetPresShell();
if (!presShell)
return NS_ERROR_UNEXPECTED;
nsViewManager* viewManager = presShell->GetViewManager();
if (!viewManager)
return NS_ERROR_UNEXPECTED;
nsView* view = viewManager->GetRootView();
if (!view)
return NS_ERROR_UNEXPECTED;
nsIWidget* widget = view->GetWidget();
rtc::scoped_refptr<webrtc::VideoCaptureModuleEx> capturer = CreateWindowCapturer(widget);
if (!capturer)
return NS_ERROR_FAILURE;
gfx::IntMargin margin;
auto bounds = widget->GetScreenBounds().ToUnknownRect();
auto clientBounds = widget->GetClientBounds().ToUnknownRect();
// Crop the image to exclude frame (if any).
margin = bounds - clientBounds;
// Crop the image to exclude controls.
margin.top += offsetTop;
nsCString error;
RefPtr<ScreencastEncoder> encoder;
if (isVideo) {
encoder = ScreencastEncoder::create(error, PromiseFlatCString(aVideoFileName), width, height, margin);
if (!encoder) {
fprintf(stderr, "Failed to create ScreencastEncoder: %s\n", error.get());
return NS_ERROR_FAILURE;
}
}
nsString uid;
nsresult rv = generateUid(uid);
NS_ENSURE_SUCCESS(rv, rv);
sessionId = uid;
auto session = std::make_unique<Session>(std::move(capturer), std::move(encoder), margin, isVideo ? 0 : quality);
if (!session->Start())
return NS_ERROR_FAILURE;
mIdToSession.emplace(sessionId, std::move(session));
return NS_OK;
}
nsresult nsScreencastService::StopVideoRecording(const nsAString& aSessionId) {
nsString sessionId(aSessionId);
auto it = mIdToSession.find(sessionId);
if (it == mIdToSession.end())
return NS_ERROR_INVALID_ARG;
it->second->Stop([sessionId] {
NS_DispatchToMainThread(NS_NewRunnableFunction(
"NotifyScreencastStopped", [sessionId]() -> void {
NotifyScreencastStopped(sessionId);
}));
});
mIdToSession.erase(it);
return NS_OK;
}
nsresult nsScreencastService::ScreencastFrameAck(const nsAString& aSessionId) {
nsString sessionId(aSessionId);
auto it = mIdToSession.find(sessionId);
if (it == mIdToSession.end())
return NS_ERROR_INVALID_ARG;
it->second->ScreencastFrameAck();
return NS_OK;
}
} // namespace mozilla
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