firefox/firefox-pipewire.patch

diff -up firefox-64.0/config/system-headers.mozbuild.firefox-pipewire firefox-64.0/config/system-headers.mozbuild
--- firefox-64.0/config/system-headers.mozbuild.firefox-pipewire	2018-12-04 00:34:00.000000000 +0100
+++ firefox-64.0/config/system-headers.mozbuild	2018-12-05 13:04:08.828063572 +0100
@@ -314,6 +314,7 @@ system_headers = [
     'Gestalt.h',
     'getopt.h',
     'gio/gio.h',
+    'gio/gunixfdlist.h',
     'glibconfig.h',
     'glib.h',
     'glib-object.h',
@@ -607,6 +608,7 @@ system_headers = [
     'Pgenerr.h',
     'PGenErr.h',
     'Ph.h',
+    'pipewire/pipewire.h',
     'pixman.h',
     'pk11func.h',
     'pk11pqg.h',
diff -up firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/app_capturer_linux.cc.firefox-pipewire firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/app_capturer_linux.cc
--- firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/app_capturer_linux.cc.firefox-pipewire	2018-12-05 13:04:08.828063572 +0100
+++ firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/app_capturer_linux.cc	2018-12-05 13:04:08.828063572 +0100
@@ -0,0 +1,55 @@
+/*
+ *  Copyright (c) 2018 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 "webrtc/modules/desktop_capture/desktop_capture_options.h"
+#include "webrtc/modules/desktop_capture/desktop_capturer.h"
+
+#if defined(USE_PIPEWIRE)
+#include "webrtc/modules/desktop_capture/app_capturer_null.cc"
+#endif // defined(USE_PIPEWIRE)
+
+#if defined(USE_X11)
+#include "webrtc/modules/desktop_capture/app_capturer_x11.cc"
+#endif // defined(USE_X11)
+
+namespace webrtc {
+
+// static
+AppCapturer* AppCapturer::Create(const DesktopCaptureOptions& options) {
+#if defined(USE_PIPEWIRE)
+  if (DesktopCapturer::IsRunningUnderWayland()) {
+    return new AppCapturerNull();
+  }
+#endif // defined(USE_PIPEWIRE)
+
+#if defined(USE_X11)
+    return AppCapturerX11::Create(options);
+#endif // defined(USE_X11)
+
+  return nullptr;
+}
+
+// static
+std::unique_ptr<DesktopCapturer> DesktopCapturer::CreateRawAppCapturer(
+    const DesktopCaptureOptions& options) {
+#if defined(USE_PIPEWIRE)
+  if (DesktopCapturer::IsRunningUnderWayland()) {
+    return std::unique_ptr<DesktopCapturer>(new AppCapturerNull());
+  }
+#endif // defined(USE_PIPEWIRE)
+
+#if defined(USE_X11)
+  return AppCapturerX11::CreateRawAppCapturer(options);
+#endif // defined(USE_X11)
+
+  return nullptr;
+}
+
+}  // namespace webrtc
diff -up firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/app_capturer_null.cc.firefox-pipewire firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/app_capturer_null.cc
--- firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/app_capturer_null.cc.firefox-pipewire	2018-12-04 00:34:15.000000000 +0100
+++ firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/app_capturer_null.cc	2018-12-05 13:04:08.829063566 +0100
@@ -7,8 +7,8 @@
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */
-#include "webrtc/modules/desktop_capture/window_capturer.h"
 #include "webrtc/modules/desktop_capture/app_capturer.h"
+#include "webrtc/modules/desktop_capture/desktop_capturer.h"
 
 #include <assert.h>
 
@@ -29,9 +29,11 @@ public:
   virtual bool BringAppToFront()	override;
 
   // DesktopCapturer interface.
-  virtual void Start(Callback* callback) override;
-  virtual void Stop() override;
-  virtual void Capture(const DesktopRegion& region) override;
+  void Start(Callback* callback) override;
+  void Stop() override;
+  void CaptureFrame() override;
+  bool GetSourceList(SourceList* sources) override;
+  bool SelectSource(SourceId id) override;
 
 private:
   Callback* callback_;
@@ -61,7 +63,16 @@ bool AppCapturerNull::BringAppToFront()
   return false;
 }
 
-// DesktopCapturer interface.
+bool AppCapturerNull::GetSourceList(SourceList* sources) {
+  // Not implemented yet.
+  return false;
+}
+
+bool AppCapturerNull::SelectSource(SourceId id) {
+  // Not implemented yet.
+  return false;
+}
+
 void AppCapturerNull::Start(Callback* callback) {
   assert(!callback_);
   assert(callback);
@@ -73,16 +84,19 @@ void AppCapturerNull::Stop() {
   callback_ = NULL;
 }
 
-void AppCapturerNull::Capture(const DesktopRegion& region) {
-  // Not implemented yet: See Bug 1036653
-  callback_->OnCaptureCompleted(NULL);
+void AppCapturerNull::CaptureFrame() {
+  // Not implemented yet.
+  callback_->OnCaptureResult(Result::ERROR_TEMPORARY, nullptr);
 }
 
 }  // namespace
 
+#if not defined(USE_PIPEWIRE)
 // static
-AppCapturer* AppCapturer::Create(const DesktopCaptureOptions& options) {
-  return new AppCapturerNull();
+std::unique_ptr<DesktopCapturer> DesktopCapturer::CreateRawAppCapturer(
+    const DesktopCaptureOptions& options) {
+  return std::unique_ptr<DesktopCapturer>(new AppCapturerNull());
 }
+#endif // not defined(USE_PIPEWIRE)
 
 }  // namespace webrtc
diff -up firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/app_capturer_x11.cc.firefox-pipewire firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/app_capturer_x11.cc
--- firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/app_capturer_x11.cc.firefox-pipewire	2018-12-04 00:34:14.000000000 +0100
+++ firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/app_capturer_x11.cc	2018-12-05 13:04:08.829063566 +0100
@@ -53,10 +53,13 @@ protected:
   std::unique_ptr<DesktopFrame> frame_;
 };
 
-class AppCapturerLinux : public AppCapturer {
+class AppCapturerX11 : public AppCapturer {
 public:
-  AppCapturerLinux(const DesktopCaptureOptions& options);
-  virtual ~AppCapturerLinux();
+  AppCapturerX11(const DesktopCaptureOptions& options);
+  virtual ~AppCapturerX11();
+
+  static AppCapturer* Create(const DesktopCaptureOptions& options);
+  static std::unique_ptr<DesktopCapturer> CreateRawAppCapturer(const DesktopCaptureOptions& options);
 
   // AppCapturer interface.
   virtual bool GetAppList(AppList* apps) override;
@@ -91,10 +94,9 @@ private:
   Region rgn_background_;
 
   rtc::scoped_refptr<SharedXDisplay> x_display_;
-  RTC_DISALLOW_COPY_AND_ASSIGN(AppCapturerLinux);
+  RTC_DISALLOW_COPY_AND_ASSIGN(AppCapturerX11);
 };
-
-AppCapturerLinux::AppCapturerLinux(const DesktopCaptureOptions& options)
+AppCapturerX11::AppCapturerX11(const DesktopCaptureOptions& options)
     : callback_(NULL),
       selected_process_(0),
       x_display_(options.x_display()) {
@@ -103,7 +105,7 @@ AppCapturerLinux::AppCapturerLinux(const
   rgn_background_ = XCreateRegion();
 }
 
-AppCapturerLinux::~AppCapturerLinux() {
+AppCapturerX11::~AppCapturerX11() {
   if (rgn_mask_) {
     XDestroyRegion(rgn_mask_);
   }
@@ -116,32 +118,32 @@ AppCapturerLinux::~AppCapturerLinux() {
 }
 
 // AppCapturer interface.
-bool AppCapturerLinux::GetAppList(AppList* apps) {
+bool AppCapturerX11::GetAppList(AppList* apps) {
   // Implemented in DesktopDeviceInfo
   return true;
 }
-bool AppCapturerLinux::SelectApp(ProcessId processId) {
+bool AppCapturerX11::SelectApp(ProcessId processId) {
   selected_process_ = processId;
   return true;
 }
-bool AppCapturerLinux::BringAppToFront() {
+bool AppCapturerX11::BringAppToFront() {
   // Not implemented yet: See Bug 1036653
   return true;
 }
 
 // DesktopCapturer interface.
-void AppCapturerLinux::Start(Callback* callback) {
+void AppCapturerX11::Start(Callback* callback) {
   assert(!callback_);
   assert(callback);
 
   callback_ = callback;
 }
 
-void AppCapturerLinux::Stop() {
+void AppCapturerX11::Stop() {
   callback_ = NULL;
 }
 
-void AppCapturerLinux::CaptureFrame() {
+void AppCapturerX11::CaptureFrame() {
   XErrorTrap error_trap(GetDisplay());
 
   //Capture screen >> set root window as capture window
@@ -169,7 +171,7 @@ void AppCapturerLinux::CaptureFrame() {
   }
 }
 
-void AppCapturerLinux::FillDesktopFrameRegionWithColor(DesktopFrame* pDesktopFrame, Region rgn, uint32_t color) {
+void AppCapturerX11::FillDesktopFrameRegionWithColor(DesktopFrame* pDesktopFrame, Region rgn, uint32_t color) {
   XErrorTrap error_trap(GetDisplay());
 
   if (!pDesktopFrame) {
@@ -192,7 +194,7 @@ void AppCapturerLinux::FillDesktopFrameR
   }
 }
 
-bool AppCapturerLinux::UpdateRegions() {
+bool AppCapturerX11::UpdateRegions() {
   XErrorTrap error_trap(GetDisplay());
 
   XSubtractRegion(rgn_visual_, rgn_visual_, rgn_visual_);
@@ -272,18 +274,18 @@ bool AppCapturerLinux::UpdateRegions() {
 }  // namespace
 
 // static
-AppCapturer* AppCapturer::Create(const DesktopCaptureOptions& options) {
-  return new AppCapturerLinux(options);
+AppCapturer* AppCapturerX11::Create(const DesktopCaptureOptions& options) {
+  return new AppCapturerX11(options);
 }
 
 // static
-std::unique_ptr<DesktopCapturer> DesktopCapturer::CreateRawAppCapturer(
+std::unique_ptr<DesktopCapturer> AppCapturerX11::CreateRawAppCapturer(
     const DesktopCaptureOptions& options) {
 
   if (!options.x_display())
     return nullptr;
 
-  std::unique_ptr<AppCapturerLinux> capturer(new AppCapturerLinux(options));
+  std::unique_ptr<AppCapturerX11> capturer(new AppCapturerX11(options));
 
   return std::unique_ptr<DesktopCapturer>(std::move(capturer));
 }
diff -up firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/base_capturer_pipewire.cc.firefox-pipewire firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/base_capturer_pipewire.cc
--- firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/base_capturer_pipewire.cc.firefox-pipewire	2018-12-05 13:04:08.832063551 +0100
+++ firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/base_capturer_pipewire.cc	2018-12-05 13:04:08.832063551 +0100
@@ -0,0 +1,849 @@
+/*
+ *  Copyright 2018 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 <cstring>
+#include <gio/gunixfdlist.h>
+#include <glib-object.h>
+
+#include <spa/param/format-utils.h>
+#include <spa/param/props.h>
+#include <spa/param/video/raw-utils.h>
+#include <spa/support/type-map.h>
+
+#include "webrtc/modules/desktop_capture/base_capturer_pipewire.h"
+
+#include "webrtc/modules/desktop_capture/desktop_capture_options.h"
+#include "webrtc/modules/desktop_capture/desktop_capturer.h"
+#include "webrtc/base/checks.h"
+#include "webrtc/base/logging.h"
+
+namespace webrtc {
+
+const char kDesktopBusName[] = "org.freedesktop.portal.Desktop";
+const char kDesktopObjectPath[] = "/org/freedesktop/portal/desktop";
+const char kDesktopRequestObjectPath[] =
+    "/org/freedesktop/portal/desktop/request";
+const char kSessionInterfaceName[] = "org.freedesktop.portal.Session";
+const char kRequestInterfaceName[] = "org.freedesktop.portal.Request";
+const char kScreenCastInterfaceName[] = "org.freedesktop.portal.ScreenCast";
+
+const int kBytesPerPixelPw = 4;
+
+// static
+void BaseCapturerPipeWire::OnStateChanged(void* data,
+                                            pw_remote_state old_state,
+                                            pw_remote_state state,
+                                            const char* error_message) {
+  BaseCapturerPipeWire* that = static_cast<BaseCapturerPipeWire*>(data);
+  RTC_DCHECK(that);
+
+  switch (state) {
+    case PW_REMOTE_STATE_ERROR:
+      LOG(LS_ERROR) << "PipeWire remote state error: " << error_message;
+      break;
+    case PW_REMOTE_STATE_CONNECTED:
+      LOG(LS_INFO) << "PipeWire remote state: connected.";
+      that->CreateReceivingStream();
+      break;
+    case PW_REMOTE_STATE_CONNECTING:
+      LOG(LS_INFO) << "PipeWire remote state: connecting.";
+      break;
+    case PW_REMOTE_STATE_UNCONNECTED:
+      LOG(LS_INFO) << "PipeWire remote state: unconnected.";
+      break;
+  }
+}
+
+// static
+void BaseCapturerPipeWire::OnStreamStateChanged(void* data,
+                                                  pw_stream_state old_state,
+                                                  pw_stream_state state,
+                                                  const char* error_message) {
+  BaseCapturerPipeWire* that = static_cast<BaseCapturerPipeWire*>(data);
+  RTC_DCHECK(that);
+
+  switch (state) {
+    case PW_STREAM_STATE_ERROR:
+      LOG(LS_ERROR) << "PipeWire stream state error: " << error_message;
+      break;
+    case PW_STREAM_STATE_CONFIGURE:
+      pw_stream_set_active(that->pw_stream_, true);
+      break;
+    case PW_STREAM_STATE_UNCONNECTED:
+    case PW_STREAM_STATE_CONNECTING:
+    case PW_STREAM_STATE_READY:
+    case PW_STREAM_STATE_PAUSED:
+    case PW_STREAM_STATE_STREAMING:
+      break;
+  }
+}
+
+// static
+void BaseCapturerPipeWire::OnStreamFormatChanged(
+    void* data,
+    const struct spa_pod* format) {
+  BaseCapturerPipeWire* that = static_cast<BaseCapturerPipeWire*>(data);
+  RTC_DCHECK(that);
+
+  LOG(LS_INFO) << "PipeWire stream format changed.";
+
+  if (!format) {
+    pw_stream_finish_format(that->pw_stream_, /*res=*/0, /*params=*/nullptr,
+                            /*n_params=*/0);
+    return;
+  }
+
+  that->spa_video_format_ = new spa_video_info_raw();
+  spa_format_video_raw_parse(format, that->spa_video_format_,
+                             &that->pw_type_->format_video);
+
+  auto width = that->spa_video_format_->size.width;
+  auto height = that->spa_video_format_->size.height;
+  auto stride = SPA_ROUND_UP_N(width * kBytesPerPixelPw, 4);
+  auto size = height * stride;
+
+  uint8_t buffer[1024] = {};
+  auto builder = spa_pod_builder{buffer, sizeof(buffer)};
+
+  // Setup buffers and meta header for new format.
+  const struct spa_pod* params[2];
+  params[0] = reinterpret_cast<spa_pod*>(spa_pod_builder_object(
+      &builder,
+      // id to enumerate buffer requirements
+      that->pw_core_type_->param.idBuffers,
+      that->pw_core_type_->param_buffers.Buffers,
+      // Size: specified as integer (i) and set to specified size
+      ":", that->pw_core_type_->param_buffers.size, "i", size,
+      // Stride: specified as integer (i) and set to specified stride
+      ":", that->pw_core_type_->param_buffers.stride, "i", stride,
+      // Buffers: specifies how many buffers we want to deal with, set as
+      // integer (i) where preferred number is 8, then allowed number is defined
+      // as range (r) from min and max values and it is undecided (u) to allow
+      // negotiation
+      ":", that->pw_core_type_->param_buffers.buffers, "iru", 8,
+      SPA_POD_PROP_MIN_MAX(1, 32),
+      // Align: memory alignment of the buffer, set as integer (i) to specified
+      // value
+      ":", that->pw_core_type_->param_buffers.align, "i", 16));
+  params[1] = reinterpret_cast<spa_pod*>(spa_pod_builder_object(
+      &builder,
+      // id to enumerate supported metadata
+      that->pw_core_type_->param.idMeta, that->pw_core_type_->param_meta.Meta,
+      // Type: specified as id or enum (I)
+      ":", that->pw_core_type_->param_meta.type, "I",
+      that->pw_core_type_->meta.Header,
+      // Size: size of the metadata, specified as integer (i)
+      ":", that->pw_core_type_->param_meta.size, "i",
+      sizeof(struct spa_meta_header)));
+
+  pw_stream_finish_format(that->pw_stream_, /*res=*/0, params, /*n_params=*/2);
+}
+
+// static
+void BaseCapturerPipeWire::OnStreamProcess(void* data) {
+  BaseCapturerPipeWire* that = static_cast<BaseCapturerPipeWire*>(data);
+  RTC_DCHECK(that);
+
+  pw_buffer* buf = nullptr;
+
+  if (!(buf = pw_stream_dequeue_buffer(that->pw_stream_))) {
+    return;
+  }
+
+  that->HandleBuffer(buf);
+
+  pw_stream_queue_buffer(that->pw_stream_, buf);
+}
+
+BaseCapturerPipeWire::BaseCapturerPipeWire(CaptureSourceType source_type)
+    : capture_source_type_(source_type) {}
+
+BaseCapturerPipeWire::~BaseCapturerPipeWire() {
+  if (pw_main_loop_) {
+    pw_thread_loop_stop(pw_main_loop_);
+  }
+
+  if (pw_type_) {
+    delete pw_type_;
+  }
+
+  if (spa_video_format_) {
+    delete spa_video_format_;
+  }
+
+  if (pw_stream_) {
+    pw_stream_destroy(pw_stream_);
+  }
+
+  if (pw_remote_) {
+    pw_remote_destroy(pw_remote_);
+  }
+
+  if (pw_core_) {
+    pw_core_destroy(pw_core_);
+  }
+
+  if (pw_main_loop_) {
+    pw_thread_loop_destroy(pw_main_loop_);
+  }
+
+  if (pw_loop_) {
+    pw_loop_destroy(pw_loop_);
+  }
+
+  if (current_frame_) {
+    free(current_frame_);
+  }
+
+  if (start_request_signal_id_) {
+    g_dbus_connection_signal_unsubscribe(connection_, start_request_signal_id_);
+  }
+  if (sources_request_signal_id_) {
+    g_dbus_connection_signal_unsubscribe(connection_,
+                                         sources_request_signal_id_);
+  }
+  if (session_request_signal_id_) {
+    g_dbus_connection_signal_unsubscribe(connection_,
+                                         session_request_signal_id_);
+  }
+
+  if (session_handle_) {
+    GDBusMessage* message = g_dbus_message_new_method_call(
+        kDesktopBusName, session_handle_, kSessionInterfaceName, "Close");
+    if (message) {
+      GError* error = nullptr;
+      g_dbus_connection_send_message(connection_, message,
+                                     G_DBUS_SEND_MESSAGE_FLAGS_NONE,
+                                     /*out_serial=*/nullptr, &error);
+      if (error) {
+        LOG(LS_ERROR) << "Failed to close the session: " << error->message;
+        g_error_free(error);
+      }
+      g_object_unref(message);
+    }
+  }
+
+  g_free(start_handle_);
+  g_free(sources_handle_);
+  g_free(session_handle_);
+  g_free(portal_handle_);
+
+  if (proxy_) {
+    g_clear_object(&proxy_);
+  }
+}
+
+void BaseCapturerPipeWire::InitPortals() {
+  g_dbus_proxy_new_for_bus(
+      G_BUS_TYPE_SESSION, G_DBUS_PROXY_FLAGS_NONE, /*info=*/nullptr,
+      kDesktopBusName, kDesktopObjectPath, kScreenCastInterfaceName,
+      /*cancellable=*/nullptr,
+      reinterpret_cast<GAsyncReadyCallback>(OnProxyRequested), this);
+}
+
+void BaseCapturerPipeWire::InitPipeWire() {
+  pw_init(/*argc=*/nullptr, /*argc=*/nullptr);
+
+  pw_loop_ = pw_loop_new(/*properties=*/nullptr);
+  pw_main_loop_ = pw_thread_loop_new(pw_loop_, "pipewire-main-loop");
+
+  pw_core_ = pw_core_new(pw_loop_, /*properties=*/nullptr);
+  pw_core_type_ = pw_core_get_type(pw_core_);
+  pw_remote_ = pw_remote_new(pw_core_, nullptr, /*user_data_size=*/0);
+
+  InitPipeWireTypes();
+
+  // Initialize event handlers, remote end and stream-related.
+  pw_remote_events_.version = PW_VERSION_REMOTE_EVENTS;
+  pw_remote_events_.state_changed = &OnStateChanged;
+
+  pw_stream_events_.version = PW_VERSION_STREAM_EVENTS;
+  pw_stream_events_.state_changed = &OnStreamStateChanged;
+  pw_stream_events_.format_changed = &OnStreamFormatChanged;
+  pw_stream_events_.process = &OnStreamProcess;
+
+  pw_remote_add_listener(pw_remote_, &spa_remote_listener_, &pw_remote_events_,
+                         this);
+  pw_remote_connect_fd(pw_remote_, pw_fd_);
+
+  if (pw_thread_loop_start(pw_main_loop_) < 0) {
+    LOG(LS_ERROR) << "Failed to start main PipeWire loop";
+    portal_init_failed_ = true;
+  }
+}
+
+void BaseCapturerPipeWire::InitPipeWireTypes() {
+  spa_type_map* map = pw_core_type_->map;
+  pw_type_ = new PipeWireType();
+
+  spa_type_media_type_map(map, &pw_type_->media_type);
+  spa_type_media_subtype_map(map, &pw_type_->media_subtype);
+  spa_type_format_video_map(map, &pw_type_->format_video);
+  spa_type_video_format_map(map, &pw_type_->video_format);
+}
+
+void BaseCapturerPipeWire::CreateReceivingStream() {
+  spa_rectangle pwMinScreenBounds = spa_rectangle{1, 1};
+  spa_rectangle pwScreenBounds =
+      spa_rectangle{static_cast<uint32_t>(desktop_size_.width()),
+                    static_cast<uint32_t>(desktop_size_.height())};
+
+  spa_fraction pwFrameRateMin = spa_fraction{0, 1};
+  spa_fraction pwFrameRateMax = spa_fraction{60, 1};
+
+  pw_properties* reuseProps = pw_properties_new("pipewire.client.reuse", "1",
+                                                /*end of varargs*/ nullptr);
+  pw_stream_ = pw_stream_new(pw_remote_, "webrtc-consume-stream", reuseProps);
+
+  uint8_t buffer[1024] = {};
+  const spa_pod* params[1];
+  spa_pod_builder builder = spa_pod_builder{buffer, sizeof(buffer)};
+  params[0] = reinterpret_cast<spa_pod*>(spa_pod_builder_object(
+      &builder,
+      // id to enumerate formats
+      pw_core_type_->param.idEnumFormat, pw_core_type_->spa_format, "I",
+      pw_type_->media_type.video, "I", pw_type_->media_subtype.raw,
+      // Video format: specified as id or enum (I), preferred format is BGRx,
+      // then allowed formats are enumerated (e) and the format is undecided (u)
+      // to allow negotiation
+      ":", pw_type_->format_video.format, "Ieu", pw_type_->video_format.BGRx,
+      SPA_POD_PROP_ENUM(2, pw_type_->video_format.RGBx,
+                        pw_type_->video_format.BGRx),
+      // Video size: specified as rectangle (R), preferred size is specified as
+      // first parameter, then allowed size is defined as range (r) from min and
+      // max values and the format is undecided (u) to allow negotiation
+      ":", pw_type_->format_video.size, "Rru", &pwScreenBounds, 2,
+      &pwMinScreenBounds, &pwScreenBounds,
+      // Frame rate: specified as fraction (F) and set to minimum frame rate
+      // value
+      ":", pw_type_->format_video.framerate, "F", &pwFrameRateMin,
+      // Max frame rate: specified as fraction (F), preferred frame rate is set
+      // to maximum value, then allowed frame rate is defined as range (r) from
+      // min and max values and it is undecided (u) to allow negotiation
+      ":", pw_type_->format_video.max_framerate, "Fru", &pwFrameRateMax, 2,
+      &pwFrameRateMin, &pwFrameRateMax));
+
+  pw_stream_add_listener(pw_stream_, &spa_stream_listener_, &pw_stream_events_,
+                         this);
+  pw_stream_flags flags = static_cast<pw_stream_flags>(
+      PW_STREAM_FLAG_AUTOCONNECT | PW_STREAM_FLAG_INACTIVE |
+      PW_STREAM_FLAG_MAP_BUFFERS);
+  if (pw_stream_connect(pw_stream_, PW_DIRECTION_INPUT, /*port_path=*/nullptr,
+                        flags, params,
+                        /*n_params=*/1) != 0) {
+    LOG(LS_ERROR) << "Could not connect receiving stream.";
+    portal_init_failed_ = true;
+    return;
+  }
+}
+
+void BaseCapturerPipeWire::HandleBuffer(pw_buffer* buffer) {
+  spa_buffer* spaBuffer = buffer->buffer;
+  void* src = nullptr;
+
+  if (!(src = spaBuffer->datas[0].data)) {
+    return;
+  }
+
+  uint32_t maxSize = spaBuffer->datas[0].maxsize;
+  int32_t srcStride = spaBuffer->datas[0].chunk->stride;
+  if (srcStride != (desktop_size_.width() * kBytesPerPixelPw)) {
+    LOG(LS_ERROR) << "Got buffer with stride different from screen stride: "
+                      << srcStride
+                      << " != " << (desktop_size_.width() * kBytesPerPixelPw);
+    portal_init_failed_ = true;
+    return;
+  }
+
+  if (!current_frame_) {
+    current_frame_ = static_cast<uint8_t*>(malloc(maxSize));
+  }
+  RTC_DCHECK(current_frame_ != nullptr);
+
+  // If both sides decided to go with the RGBx format we need to convert it to
+  // BGRx to match color format expected by WebRTC.
+  if (spa_video_format_->format == pw_type_->video_format.RGBx) {
+    uint8_t* tempFrame = static_cast<uint8_t*>(malloc(maxSize));
+    std::memcpy(tempFrame, src, maxSize);
+    ConvertRGBxToBGRx(tempFrame, maxSize);
+    std::memcpy(current_frame_, tempFrame, maxSize);
+    free(tempFrame);
+  } else {
+    std::memcpy(current_frame_, src, maxSize);
+  }
+}
+
+void BaseCapturerPipeWire::ConvertRGBxToBGRx(uint8_t* frame, uint32_t size) {
+  // Change color format for KDE KWin which uses RGBx and not BGRx
+  for (uint32_t i = 0; i < size; i += 4) {
+    uint8_t tempR = frame[i];
+    uint8_t tempB = frame[i + 2];
+    frame[i] = tempB;
+    frame[i + 2] = tempR;
+  }
+}
+
+guint BaseCapturerPipeWire::SetupRequestResponseSignal(
+    const gchar* object_path,
+    GDBusSignalCallback callback) {
+  return g_dbus_connection_signal_subscribe(
+      connection_, kDesktopBusName, kRequestInterfaceName, "Response",
+      object_path, /*arg0=*/nullptr, G_DBUS_SIGNAL_FLAGS_NO_MATCH_RULE,
+      callback, this, /*user_data_free_func=*/nullptr);
+}
+
+// static
+void BaseCapturerPipeWire::OnProxyRequested(GObject* /*object*/,
+                                              GAsyncResult* result,
+                                              gpointer user_data) {
+  BaseCapturerPipeWire* that =
+      static_cast<BaseCapturerPipeWire*>(user_data);
+  RTC_DCHECK(that);
+
+  GError* error = nullptr;
+  that->proxy_ = g_dbus_proxy_new_finish(result, &error);
+  if (!that->proxy_) {
+    LOG(LS_ERROR) << "Failed to create a proxy for the screen cast portal: "
+                      << error->message;
+    g_error_free(error);
+    that->portal_init_failed_ = true;
+    return;
+  }
+  that->connection_ = g_dbus_proxy_get_connection(that->proxy_);
+
+  LOG(LS_INFO) << "Created proxy for the screen cast portal.";
+  that->SessionRequest();
+}
+
+// static
+gchar* BaseCapturerPipeWire::PrepareSignalHandle(GDBusConnection* connection,
+                                                   const gchar* token) {
+  gchar* sender = g_strdup(g_dbus_connection_get_unique_name(connection) + 1);
+  for (int i = 0; sender[i]; i++) {
+    if (sender[i] == '.') {
+      sender[i] = '_';
+    }
+  }
+
+  gchar* handle = g_strconcat(kDesktopRequestObjectPath, "/", sender, "/",
+                              token, /*end of varargs*/ nullptr);
+  g_free(sender);
+
+  return handle;
+}
+
+void BaseCapturerPipeWire::SessionRequest() {
+  GVariantBuilder builder;
+  gchar* variant_string;
+
+  g_variant_builder_init(&builder, G_VARIANT_TYPE_VARDICT);
+  variant_string =
+      g_strdup_printf("webrtc_session%d", g_random_int_range(0, G_MAXINT));
+  g_variant_builder_add(&builder, "{sv}", "session_handle_token",
+                        g_variant_new_string(variant_string));
+  g_free(variant_string);
+  variant_string = g_strdup_printf("webrtc%d", g_random_int_range(0, G_MAXINT));
+  g_variant_builder_add(&builder, "{sv}", "handle_token",
+                        g_variant_new_string(variant_string));
+
+  portal_handle_ = PrepareSignalHandle(connection_, variant_string);
+  session_request_signal_id_ = SetupRequestResponseSignal(
+      portal_handle_, OnSessionRequestResponseSignal);
+  g_free(variant_string);
+
+  LOG(LS_INFO) << "Screen cast session requested.";
+  g_dbus_proxy_call(
+      proxy_, "CreateSession", g_variant_new("(a{sv})", &builder),
+      G_DBUS_CALL_FLAGS_NONE, /*timeout=*/-1, /*cancellable=*/nullptr,
+      reinterpret_cast<GAsyncReadyCallback>(OnSessionRequested), this);
+}
+
+// static
+void BaseCapturerPipeWire::OnSessionRequested(GDBusConnection* connection,
+                                                GAsyncResult* result,
+                                                gpointer user_data) {
+  BaseCapturerPipeWire* that =
+      static_cast<BaseCapturerPipeWire*>(user_data);
+  RTC_DCHECK(that);
+
+  GError* error = nullptr;
+  GVariant* variant = g_dbus_proxy_call_finish(that->proxy_, result, &error);
+  if (!variant) {
+    LOG(LS_ERROR) << "Failed to create a screen cast session: "
+                      << error->message;
+    g_error_free(error);
+    that->portal_init_failed_ = true;
+    return;
+  }
+  LOG(LS_INFO) << "Initializing the screen cast session.";
+
+  gchar* handle = nullptr;
+  g_variant_get_child(variant, 0, "o", &handle);
+  g_variant_unref(variant);
+  if (!handle) {
+    LOG(LS_ERROR) << "Failed to initialize the screen cast session.";
+    if (that->session_request_signal_id_) {
+      g_dbus_connection_signal_unsubscribe(connection,
+                                           that->session_request_signal_id_);
+      that->session_request_signal_id_ = 0;
+    }
+    that->portal_init_failed_ = true;
+    return;
+  }
+
+  g_free(handle);
+
+  LOG(LS_INFO) << "Subscribing to the screen cast session.";
+}
+
+// static
+void BaseCapturerPipeWire::OnSessionRequestResponseSignal(
+    GDBusConnection* connection,
+    const gchar* sender_name,
+    const gchar* object_path,
+    const gchar* interface_name,
+    const gchar* signal_name,
+    GVariant* parameters,
+    gpointer user_data) {
+  BaseCapturerPipeWire* that =
+      static_cast<BaseCapturerPipeWire*>(user_data);
+  RTC_DCHECK(that);
+
+
+  LOG(LS_INFO)
+      << "Received response for the screen cast session subscription.";
+
+  guint32 portal_response;
+  GVariant* response_data;
+  g_variant_get(parameters, "(u@a{sv})", &portal_response, &response_data);
+  g_variant_lookup(response_data, "session_handle", "s",
+                   &that->session_handle_);
+  g_variant_unref(response_data);
+
+  if (!that->session_handle_ || portal_response) {
+    LOG(LS_ERROR)
+        << "Failed to request the screen cast session subscription.";
+    that->portal_init_failed_ = true;
+    return;
+  }
+
+  that->SourcesRequest();
+}
+
+void BaseCapturerPipeWire::SourcesRequest() {
+  GVariantBuilder builder;
+  gchar* variant_string;
+
+  g_variant_builder_init(&builder, G_VARIANT_TYPE_VARDICT);
+  // We want to record monitor content.
+  g_variant_builder_add(&builder, "{sv}", "types",
+                        g_variant_new_uint32(capture_source_type_));
+  // We don't want to allow selection of multiple sources.
+  g_variant_builder_add(&builder, "{sv}", "multiple",
+                        g_variant_new_boolean(false));
+  variant_string = g_strdup_printf("webrtc%d", g_random_int_range(0, G_MAXINT));
+  g_variant_builder_add(&builder, "{sv}", "handle_token",
+                        g_variant_new_string(variant_string));
+
+  sources_handle_ = PrepareSignalHandle(connection_, variant_string);
+  sources_request_signal_id_ = SetupRequestResponseSignal(
+      sources_handle_, OnSourcesRequestResponseSignal);
+  g_free(variant_string);
+
+  LOG(LS_INFO) << "Requesting sources from the screen cast session.";
+  g_dbus_proxy_call(
+      proxy_, "SelectSources",
+      g_variant_new("(oa{sv})", session_handle_, &builder),
+      G_DBUS_CALL_FLAGS_NONE, /*timeout=*/-1, /*cancellable=*/nullptr,
+      reinterpret_cast<GAsyncReadyCallback>(OnSourcesRequested), this);
+}
+
+// static
+void BaseCapturerPipeWire::OnSourcesRequested(GDBusConnection* connection,
+                                                GAsyncResult* result,
+                                                gpointer user_data) {
+  BaseCapturerPipeWire* that =
+      static_cast<BaseCapturerPipeWire*>(user_data);
+  RTC_DCHECK(that);
+
+  GError* error = nullptr;
+  GVariant* variant = g_dbus_proxy_call_finish(that->proxy_, result, &error);
+  if (!variant) {
+    LOG(LS_ERROR) << "Failed to request the sources: " << error->message;
+    g_error_free(error);
+    that->portal_init_failed_ = true;
+    return;
+  }
+
+  LOG(LS_INFO) << "Sources requested from the screen cast session.";
+
+  gchar* handle = nullptr;
+  g_variant_get_child(variant, 0, "o", &handle);
+  g_variant_unref(variant);
+  if (!handle) {
+    LOG(LS_ERROR) << "Failed to initialize the screen cast session.";
+    if (that->sources_request_signal_id_) {
+      g_dbus_connection_signal_unsubscribe(connection,
+                                           that->sources_request_signal_id_);
+      that->sources_request_signal_id_ = 0;
+    }
+    that->portal_init_failed_ = true;
+    return;
+  }
+
+  g_free(handle);
+
+  LOG(LS_INFO) << "Subscribed to sources signal.";
+}
+
+// static
+void BaseCapturerPipeWire::OnSourcesRequestResponseSignal(
+    GDBusConnection* connection,
+    const gchar* sender_name,
+    const gchar* object_path,
+    const gchar* interface_name,
+    const gchar* signal_name,
+    GVariant* parameters,
+    gpointer user_data) {
+  BaseCapturerPipeWire* that =
+      static_cast<BaseCapturerPipeWire*>(user_data);
+  RTC_DCHECK(that);
+
+  guint32 portal_response;
+  g_variant_get(parameters, "(u@a{sv})", &portal_response, nullptr);
+  if (portal_response) {
+    LOG(LS_ERROR)
+        << "Failed to select sources for the screen cast session.";
+    that->portal_init_failed_ = true;
+    return;
+  }
+
+  LOG(LS_INFO) << "Received sources signal from session.";
+  that->StartRequest();
+}
+
+void BaseCapturerPipeWire::StartRequest() {
+  GVariantBuilder builder;
+  gchar* variant_string;
+
+  g_variant_builder_init(&builder, G_VARIANT_TYPE_VARDICT);
+  variant_string = g_strdup_printf("webrtc%d", g_random_int_range(0, G_MAXINT));
+  g_variant_builder_add(&builder, "{sv}", "handle_token",
+                        g_variant_new_string(variant_string));
+
+  start_handle_ = PrepareSignalHandle(connection_, variant_string);
+  start_request_signal_id_ =
+      SetupRequestResponseSignal(start_handle_, OnStartRequestResponseSignal);
+  g_free(variant_string);
+
+  // "Identifier for the application window", this is Wayland, so not "x11:...".
+  const gchar parent_window[] = "";
+
+  LOG(LS_INFO) << "Starting the screen cast session.";
+  g_dbus_proxy_call(
+      proxy_, "Start",
+      g_variant_new("(osa{sv})", session_handle_, parent_window, &builder),
+      G_DBUS_CALL_FLAGS_NONE, /*timeout=*/-1, /*cancellable=*/nullptr,
+      reinterpret_cast<GAsyncReadyCallback>(OnStartRequested), this);
+}
+
+// static
+void BaseCapturerPipeWire::OnStartRequested(GDBusConnection* connection,
+                                              GAsyncResult* result,
+                                              gpointer user_data) {
+  BaseCapturerPipeWire* that =
+      static_cast<BaseCapturerPipeWire*>(user_data);
+  RTC_DCHECK(that);
+
+  GError* error = nullptr;
+  GVariant* variant = g_dbus_proxy_call_finish(that->proxy_, result, &error);
+  if (!variant) {
+    LOG(LS_ERROR) << "Failed to start the screen cast session: "
+                      << error->message;
+    g_error_free(error);
+    that->portal_init_failed_ = true;
+    return;
+  }
+
+  LOG(LS_INFO) << "Initializing the start of the screen cast session.";
+
+  gchar* handle = nullptr;
+  g_variant_get_child(variant, 0, "o", &handle);
+  g_variant_unref(variant);
+  if (!handle) {
+    LOG(LS_ERROR)
+        << "Failed to initialize the start of the screen cast session.";
+    if (that->start_request_signal_id_) {
+      g_dbus_connection_signal_unsubscribe(connection,
+                                           that->start_request_signal_id_);
+      that->start_request_signal_id_ = 0;
+    }
+    that->portal_init_failed_ = true;
+    return;
+  }
+
+  g_free(handle);
+
+  LOG(LS_INFO) << "Subscribed to the start signal.";
+}
+
+// static
+void BaseCapturerPipeWire::OnStartRequestResponseSignal(
+    GDBusConnection* connection,
+    const gchar* sender_name,
+    const gchar* object_path,
+    const gchar* interface_name,
+    const gchar* signal_name,
+    GVariant* parameters,
+    gpointer user_data) {
+  BaseCapturerPipeWire* that =
+      static_cast<BaseCapturerPipeWire*>(user_data);
+  RTC_DCHECK(that);
+
+  LOG(LS_INFO) << "Start signal received.";
+  guint32 portal_response;
+  GVariant* response_data;
+  GVariantIter* iter = nullptr;
+  g_variant_get(parameters, "(u@a{sv})", &portal_response, &response_data);
+  if (portal_response || !response_data) {
+    LOG(LS_ERROR) << "Failed to start the screen cast session.";
+    that->portal_init_failed_ = true;
+    return;
+  }
+
+  // Array of PipeWire streams. See
+  // https://github.com/flatpak/xdg-desktop-portal/blob/master/data/org.freedesktop.portal.ScreenCast.xml
+  // documentation for <method name="Start">.
+  if (g_variant_lookup(response_data, "streams", "a(ua{sv})", &iter)) {
+    GVariant* variant;
+
+    while (g_variant_iter_next(iter, "@(ua{sv})", &variant)) {
+      guint32 stream_id;
+      gint32 width;
+      gint32 height;
+      GVariant* options;
+
+      g_variant_get(variant, "(u@a{sv})", &stream_id, &options);
+      RTC_DCHECK(options != nullptr);
+
+      g_variant_lookup(options, "size", "(ii)", &width, &height);
+
+      that->desktop_size_.set(width, height);
+
+      g_variant_unref(options);
+      g_variant_unref(variant);
+    }
+  }
+  g_variant_iter_free(iter);
+  g_variant_unref(response_data);
+
+  that->OpenPipeWireRemote();
+}
+
+void BaseCapturerPipeWire::OpenPipeWireRemote() {
+  GVariantBuilder builder;
+  g_variant_builder_init(&builder, G_VARIANT_TYPE_VARDICT);
+
+  LOG(LS_INFO) << "Opening the PipeWire remote.";
+
+  g_dbus_proxy_call_with_unix_fd_list(
+      proxy_, "OpenPipeWireRemote",
+      g_variant_new("(oa{sv})", session_handle_, &builder),
+      G_DBUS_CALL_FLAGS_NONE, /*timeout=*/-1, /*fd_list=*/nullptr,
+      /*cancellable=*/nullptr,
+      reinterpret_cast<GAsyncReadyCallback>(OnOpenPipeWireRemoteRequested),
+      this);
+}
+
+// static
+void BaseCapturerPipeWire::OnOpenPipeWireRemoteRequested(
+    GDBusConnection* connection,
+    GAsyncResult* result,
+    gpointer user_data) {
+  BaseCapturerPipeWire* that =
+      static_cast<BaseCapturerPipeWire*>(user_data);
+  RTC_DCHECK(that);
+
+  GError* error = nullptr;
+  GUnixFDList* outlist = nullptr;
+  GVariant* variant = g_dbus_proxy_call_with_unix_fd_list_finish(
+      that->proxy_, &outlist, result, &error);
+  if (!variant) {
+    LOG(LS_ERROR) << "Failed to open the PipeWire remote: "
+                      << error->message;
+    g_error_free(error);
+    that->portal_init_failed_ = true;
+    return;
+  }
+
+  gint32 index;
+  g_variant_get(variant, "(h)", &index);
+
+  if ((that->pw_fd_ = g_unix_fd_list_get(outlist, index, &error)) == -1) {
+    LOG(LS_ERROR) << "Failed to get file descriptor from the list: "
+                      << error->message;
+    g_error_free(error);
+    g_variant_unref(variant);
+    that->portal_init_failed_ = true;
+    return;
+  }
+
+  g_variant_unref(variant);
+  g_object_unref(outlist);
+
+  that->InitPipeWire();
+  LOG(LS_INFO) << "PipeWire remote opened.";
+}
+
+void BaseCapturerPipeWire::Start(Callback* callback) {
+  RTC_DCHECK(!callback_);
+  RTC_DCHECK(callback);
+
+  InitPortals();
+
+  callback_ = callback;
+}
+
+void BaseCapturerPipeWire::CaptureFrame() {
+  if (portal_init_failed_) {
+    callback_->OnCaptureResult(Result::ERROR_PERMANENT, nullptr);
+    return;
+  }
+
+  if (!current_frame_) {
+    callback_->OnCaptureResult(Result::ERROR_TEMPORARY, nullptr);
+    return;
+  }
+
+  std::unique_ptr<DesktopFrame> result(new BasicDesktopFrame(desktop_size_));
+  result->CopyPixelsFrom(
+      current_frame_, (desktop_size_.width() * kBytesPerPixelPw),
+      DesktopRect::MakeWH(desktop_size_.width(), desktop_size_.height()));
+  if (!result) {
+    callback_->OnCaptureResult(Result::ERROR_TEMPORARY, nullptr);
+    return;
+  }
+  callback_->OnCaptureResult(Result::SUCCESS, std::move(result));
+}
+
+bool BaseCapturerPipeWire::GetSourceList(SourceList* sources) {
+  RTC_DCHECK(sources->size() == 0);
+  // List of available screens is already presented by the xdg-desktop-portal.
+  // But we have to add an empty source as the code expects it.
+  sources->push_back({0});
+  return true;
+}
+
+bool BaseCapturerPipeWire::SelectSource(SourceId id) {
+  // Screen selection is handled by the xdg-desktop-portal.
+  return true;
+}
+
+}  // namespace webrtc
diff -up firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/base_capturer_pipewire.h.firefox-pipewire firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/base_capturer_pipewire.h
--- firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/base_capturer_pipewire.h.firefox-pipewire	2018-12-05 13:04:08.832063551 +0100
+++ firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/base_capturer_pipewire.h	2018-12-05 13:04:08.832063551 +0100
@@ -0,0 +1,167 @@
+/*
+ *  Copyright 2018 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.
+ */
+
+#ifndef MODULES_DESKTOP_CAPTURE_LINUX_BASE_CAPTURER_PIPEWIRE_H_
+#define MODULES_DESKTOP_CAPTURE_LINUX_BASE_CAPTURER_PIPEWIRE_H_
+
+#include <gio/gio.h>
+#define typeof __typeof__
+#include <pipewire/pipewire.h>
+#include <spa/param/video/format-utils.h>
+
+#include "webrtc/modules/desktop_capture/desktop_capture_options.h"
+#include "webrtc/modules/desktop_capture/desktop_capturer.h"
+
+namespace webrtc {
+
+class PipeWireType {
+ public:
+  spa_type_media_type media_type;
+  spa_type_media_subtype media_subtype;
+  spa_type_format_video format_video;
+  spa_type_video_format video_format;
+};
+
+class BaseCapturerPipeWire : public DesktopCapturer {
+ public:
+  enum CaptureSourceType { Screen = 1, Window };
+
+  explicit BaseCapturerPipeWire(CaptureSourceType source_type);
+  ~BaseCapturerPipeWire() override;
+
+  // DesktopCapturer interface.
+  void Start(Callback* delegate) override;
+  void Stop() override { callback_ = nullptr; }
+  void CaptureFrame() override;
+  bool GetSourceList(SourceList* sources) override;
+  bool SelectSource(SourceId id) override;
+
+ private:
+  // PipeWire types -->
+  pw_core* pw_core_ = nullptr;
+  pw_type* pw_core_type_ = nullptr;
+  pw_stream* pw_stream_ = nullptr;
+  pw_remote* pw_remote_ = nullptr;
+  pw_loop* pw_loop_ = nullptr;
+  pw_thread_loop* pw_main_loop_ = nullptr;
+  PipeWireType* pw_type_ = nullptr;
+
+  spa_hook spa_stream_listener_ = {};
+  spa_hook spa_remote_listener_ = {};
+
+  pw_stream_events pw_stream_events_ = {};
+  pw_remote_events pw_remote_events_ = {};
+
+  spa_video_info_raw* spa_video_format_ = nullptr;
+
+  gint32 pw_fd_ = -1;
+
+  CaptureSourceType capture_source_type_ =
+      BaseCapturerPipeWire::CaptureSourceType::Screen;
+
+  // <-- end of PipeWire types
+
+  GDBusConnection* connection_ = nullptr;
+  GDBusProxy* proxy_ = nullptr;
+  gchar* portal_handle_ = nullptr;
+  gchar* session_handle_ = nullptr;
+  gchar* sources_handle_ = nullptr;
+  gchar* start_handle_ = nullptr;
+  guint session_request_signal_id_ = 0;
+  guint sources_request_signal_id_ = 0;
+  guint start_request_signal_id_ = 0;
+
+  DesktopSize desktop_size_ = {};
+  DesktopCaptureOptions options_ = {};
+
+  uint8_t* current_frame_ = nullptr;
+  Callback* callback_ = nullptr;
+
+  bool portal_init_failed_ = false;
+
+  void InitPortals();
+  void InitPipeWire();
+  void InitPipeWireTypes();
+
+  void CreateReceivingStream();
+  void HandleBuffer(pw_buffer* buffer);
+
+  void ConvertRGBxToBGRx(uint8_t* frame, uint32_t size);
+
+  static void OnStateChanged(void* data,
+                             pw_remote_state old_state,
+                             pw_remote_state state,
+                             const char* error);
+  static void OnStreamStateChanged(void* data,
+                                   pw_stream_state old_state,
+                                   pw_stream_state state,
+                                   const char* error_message);
+
+  static void OnStreamFormatChanged(void* data, const struct spa_pod* format);
+  static void OnStreamProcess(void* data);
+  static void OnNewBuffer(void* data, uint32_t id);
+
+  guint SetupRequestResponseSignal(const gchar* object_path,
+                                   GDBusSignalCallback callback);
+
+  static void OnProxyRequested(GObject* object,
+                               GAsyncResult* result,
+                               gpointer user_data);
+
+  static gchar* PrepareSignalHandle(GDBusConnection* connection,
+                                    const gchar* token);
+
+  void SessionRequest();
+  static void OnSessionRequested(GDBusConnection* connection,
+                                 GAsyncResult* result,
+                                 gpointer user_data);
+  static void OnSessionRequestResponseSignal(GDBusConnection* connection,
+                                             const gchar* sender_name,
+                                             const gchar* object_path,
+                                             const gchar* interface_name,
+                                             const gchar* signal_name,
+                                             GVariant* parameters,
+                                             gpointer user_data);
+
+  void SourcesRequest();
+  static void OnSourcesRequested(GDBusConnection* connection,
+                                 GAsyncResult* result,
+                                 gpointer user_data);
+  static void OnSourcesRequestResponseSignal(GDBusConnection* connection,
+                                             const gchar* sender_name,
+                                             const gchar* object_path,
+                                             const gchar* interface_name,
+                                             const gchar* signal_name,
+                                             GVariant* parameters,
+                                             gpointer user_data);
+
+  void StartRequest();
+  static void OnStartRequested(GDBusConnection* connection,
+                               GAsyncResult* result,
+                               gpointer user_data);
+  static void OnStartRequestResponseSignal(GDBusConnection* connection,
+                                           const gchar* sender_name,
+                                           const gchar* object_path,
+                                           const gchar* interface_name,
+                                           const gchar* signal_name,
+                                           GVariant* parameters,
+                                           gpointer user_data);
+
+  void OpenPipeWireRemote();
+  static void OnOpenPipeWireRemoteRequested(GDBusConnection* connection,
+                                            GAsyncResult* result,
+                                            gpointer user_data);
+
+  RTC_DISALLOW_COPY_AND_ASSIGN(BaseCapturerPipeWire);
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_DESKTOP_CAPTURE_LINUX_BASE_CAPTURER_PIPEWIRE_H_
diff -up firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/BUILD.gn.firefox-pipewire firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/BUILD.gn
--- firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/BUILD.gn.firefox-pipewire	2018-12-04 00:34:14.000000000 +0100
+++ firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/BUILD.gn	2018-12-05 13:04:08.828063572 +0100
@@ -213,7 +213,6 @@ rtc_static_library("desktop_capture") {
     if (build_with_mozilla) {
       sources += [
         "app_capturer_x11.cc",
-        "app_capturer_x11.h",
         "x11/desktop_device_info_x11.cc",
         "x11/desktop_device_info_x11.h",
         "x11/shared_x_util.cc",
diff -up firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/desktop_capture_gn/moz.build.firefox-pipewire firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/desktop_capture_gn/moz.build
--- firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/desktop_capture_gn/moz.build.firefox-pipewire	2018-12-05 13:04:08.832063551 +0100
+++ firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/desktop_capture_gn/moz.build	2018-12-05 13:12:40.063396138 +0100
@@ -100,10 +100,6 @@ if CONFIG["OS_TARGET"] == "DragonFly":
     ]
 
     UNIFIED_SOURCES += [
-        "/media/webrtc/trunk/webrtc/modules/desktop_capture/app_capturer_x11.cc",
-        "/media/webrtc/trunk/webrtc/modules/desktop_capture/mouse_cursor_monitor_x11.cc",
-        "/media/webrtc/trunk/webrtc/modules/desktop_capture/screen_capturer_x11.cc",
-        "/media/webrtc/trunk/webrtc/modules/desktop_capture/window_capturer_x11.cc",
         "/media/webrtc/trunk/webrtc/modules/desktop_capture/x11/desktop_device_info_x11.cc",
         "/media/webrtc/trunk/webrtc/modules/desktop_capture/x11/shared_x_display.cc",
         "/media/webrtc/trunk/webrtc/modules/desktop_capture/x11/shared_x_util.cc",
@@ -111,6 +107,38 @@ if CONFIG["OS_TARGET"] == "DragonFly":
         "/media/webrtc/trunk/webrtc/modules/desktop_capture/x11/x_server_pixel_buffer.cc"
     ]
 
+# Common stuff between Pipewire and X11
+if CONFIG["OS_TARGET"] == "Linux":
+   
+    UNIFIED_SOURCES += [
+        "/media/webrtc/trunk/webrtc/modules/desktop_capture/app_capturer_linux.cc",
+        "/media/webrtc/trunk/webrtc/modules/desktop_capture/base_capturer_pipewire.cc",
+        "/media/webrtc/trunk/webrtc/modules/desktop_capture/mouse_cursor_monitor_linux.cc",
+        "/media/webrtc/trunk/webrtc/modules/desktop_capture/screen_capturer_linux.cc",
+        "/media/webrtc/trunk/webrtc/modules/desktop_capture/screen_capturer_pipewire.cc",
+        "/media/webrtc/trunk/webrtc/modules/desktop_capture/window_capturer_linux.cc",
+        "/media/webrtc/trunk/webrtc/modules/desktop_capture/window_capturer_pipewire.cc",
+    ]
+
+# Pipewire
+if CONFIG["OS_TARGET"] == "Linux":
+   
+    DEFINES["USE_PIPEWIRE"] = "1"
+   
+    OS_LIBS += [
+        "rt", 
+        "pipewire-0.2",
+        "glib-2.0",
+        "gio-2.0",
+        "gobject-2.0"
+    ]  
+       
+    CXXFLAGS += CONFIG['TK_CFLAGS']
+       
+    UNIFIED_SOURCES += [
+        "/media/webrtc/trunk/webrtc/modules/desktop_capture/mouse_cursor_monitor_null.cc"
+    ]
+
 if CONFIG["OS_TARGET"] == "FreeBSD":
 
     DEFINES["USE_X11"] = "1"
diff -up firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/desktop_capturer.cc.firefox-pipewire firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/desktop_capturer.cc
--- firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/desktop_capturer.cc.firefox-pipewire	2018-12-04 00:34:14.000000000 +0100
+++ firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/desktop_capturer.cc	2018-12-05 13:04:08.832063551 +0100
@@ -66,4 +66,17 @@ std::unique_ptr<DesktopCapturer> Desktop
   return capturer;
 }
 
+#if defined(USE_PIPEWIRE) || defined(USE_X11)
+bool DesktopCapturer::IsRunningUnderWayland() {
+  const char* xdg_session_type = getenv("XDG_SESSION_TYPE");
+  if (!xdg_session_type || strncmp(xdg_session_type, "wayland", 7) != 0)
+    return false;
+
+  if (!(getenv("WAYLAND_DISPLAY")))
+    return false;
+
+  return true;
+}
+#endif
+
 }  // namespace webrtc
diff -up firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/desktop_capturer.h.firefox-pipewire firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/desktop_capturer.h
--- firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/desktop_capturer.h.firefox-pipewire	2018-12-04 00:34:14.000000000 +0100
+++ firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/desktop_capturer.h	2018-12-05 13:04:08.832063551 +0100
@@ -129,6 +129,10 @@ class DesktopCapturer {
   static std::unique_ptr<DesktopCapturer> CreateAppCapturer(
       const DesktopCaptureOptions& options);
 
+#if defined(USE_PIPEWIRE) || defined(USE_X11)
+  static bool IsRunningUnderWayland();
+#endif
+
  protected:
   // CroppingWindowCapturer needs to create raw capturers without wrappers, so
   // the following two functions are protected.
diff -up firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/mouse_cursor_monitor_linux.cc.firefox-pipewire firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/mouse_cursor_monitor_linux.cc
--- firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/mouse_cursor_monitor_linux.cc.firefox-pipewire	2018-12-05 13:04:08.832063551 +0100
+++ firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/mouse_cursor_monitor_linux.cc	2018-12-05 13:04:08.832063551 +0100
@@ -0,0 +1,44 @@
+/*
+ *  Copyright (c) 2018 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 "webrtc/modules/desktop_capture/mouse_cursor_monitor.h"
+
+#if defined(USE_PIPEWIRE)
+#include "webrtc/modules/desktop_capture/mouse_cursor_monitor_null.cc"
+#endif // defined(USE_PIPEWIRE)
+
+#if defined(USE_X11)
+#include "webrtc/modules/desktop_capture/mouse_cursor_monitor_x11.cc"
+#endif // defined(USE_X11)
+
+namespace webrtc {
+
+// static
+MouseCursorMonitor* MouseCursorMonitor::CreateForWindow(
+    const DesktopCaptureOptions& options, WindowId window) {
+#if defined(USE_X11)
+  return MouseCursorMonitorX11::CreateForWindow(options, window);
+#else
+  return nullptr;
+#endif // defined(USE_X11)
+}
+
+// static
+MouseCursorMonitor* MouseCursorMonitor::CreateForScreen(
+    const DesktopCaptureOptions& options,
+    ScreenId screen) {
+#if defined(USE_X11)
+  return MouseCursorMonitorX11::CreateForScreen(options, screen);
+#else
+  return nullptr;
+#endif // defined(USE_X11)
+}
+
+}  // namespace webrtc
diff -up firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/mouse_cursor_monitor_null.cc.firefox-pipewire firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/mouse_cursor_monitor_null.cc
--- firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/mouse_cursor_monitor_null.cc.firefox-pipewire	2018-12-04 00:34:15.000000000 +0100
+++ firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/mouse_cursor_monitor_null.cc	2018-12-05 13:04:08.832063551 +0100
@@ -14,6 +14,7 @@
 
 namespace webrtc {
 
+#if not defined(USE_PIPEWIRE)
 MouseCursorMonitor* MouseCursorMonitor::CreateForWindow(
     const DesktopCaptureOptions& options,
     WindowId window) {
@@ -25,5 +26,6 @@ MouseCursorMonitor* MouseCursorMonitor::
     ScreenId screen) {
   return NULL;
 }
+#endif // not defined(USE_PIPEWIRE)
 
 }  // namespace webrtc
diff -up firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/mouse_cursor_monitor_x11.cc.firefox-pipewire firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/mouse_cursor_monitor_x11.cc
--- firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/mouse_cursor_monitor_x11.cc.firefox-pipewire	2018-12-04 00:34:14.000000000 +0100
+++ firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/mouse_cursor_monitor_x11.cc	2018-12-05 13:04:08.832063551 +0100
@@ -69,6 +69,9 @@ class MouseCursorMonitorX11 : public Mou
   void Stop() override;
   void Capture() override;
 
+  static MouseCursorMonitor* CreateForWindow(const DesktopCaptureOptions& options, WindowId window);
+  static MouseCursorMonitor* CreateForScreen(const DesktopCaptureOptions& options, ScreenId screen);
+
  private:
   // SharedXDisplay::XEventHandler interface.
   bool HandleXEvent(const XEvent& event) override;
@@ -244,7 +247,7 @@ void MouseCursorMonitorX11::CaptureCurso
 }
 
 // static
-MouseCursorMonitor* MouseCursorMonitor::CreateForWindow(
+MouseCursorMonitor* MouseCursorMonitorX11::CreateForWindow(
     const DesktopCaptureOptions& options, WindowId window) {
   if (!options.x_display())
     return NULL;
@@ -254,7 +257,7 @@ MouseCursorMonitor* MouseCursorMonitor::
   return new MouseCursorMonitorX11(options, outer_window, window);
 }
 
-MouseCursorMonitor* MouseCursorMonitor::CreateForScreen(
+MouseCursorMonitor* MouseCursorMonitorX11::CreateForScreen(
     const DesktopCaptureOptions& options,
     ScreenId screen) {
   if (!options.x_display())
diff -up firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/screen_capturer_linux.cc.firefox-pipewire firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/screen_capturer_linux.cc
--- firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/screen_capturer_linux.cc.firefox-pipewire	2018-12-05 13:04:08.833063546 +0100
+++ firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/screen_capturer_linux.cc	2018-12-05 13:04:08.833063546 +0100
@@ -0,0 +1,40 @@
+/*
+ *  Copyright 2018 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 "webrtc/modules/desktop_capture/desktop_capture_options.h"
+#include "webrtc/modules/desktop_capture/desktop_capturer.h"
+
+#if defined(USE_PIPEWIRE)
+#include "webrtc/modules/desktop_capture/screen_capturer_pipewire.h"
+#endif  // defined(USE_PIPEWIRE)
+
+#if defined(USE_X11)
+#include "webrtc/modules/desktop_capture/screen_capturer_x11.cc"
+#endif  // defined(USE_X11)
+
+namespace webrtc {
+
+// static
+std::unique_ptr<DesktopCapturer> DesktopCapturer::CreateRawScreenCapturer(
+    const DesktopCaptureOptions& options) {
+#if defined(USE_PIPEWIRE)
+  if (DesktopCapturer::IsRunningUnderWayland()) {
+    return ScreenCapturerPipeWire::CreateRawScreenCapturer(options);
+  }
+#endif  // defined(USE_PIPEWIRE)
+
+#if defined(USE_X11)
+  return ScreenCapturerX11::CreateRawScreenCapturer(options);
+#endif  // defined(USE_X11)
+
+  return nullptr;
+}
+
+}  // namespace webrtc
diff -up firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/screen_capturer_pipewire.cc.firefox-pipewire firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/screen_capturer_pipewire.cc
--- firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/screen_capturer_pipewire.cc.firefox-pipewire	2018-12-05 13:04:08.833063546 +0100
+++ firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/screen_capturer_pipewire.cc	2018-12-05 13:04:08.833063546 +0100
@@ -0,0 +1,31 @@
+/*
+ *  Copyright 2018 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 "webrtc/modules/desktop_capture/screen_capturer_pipewire.h"
+
+#include <memory>
+
+namespace webrtc {
+
+ScreenCapturerPipeWire::ScreenCapturerPipeWire()
+    : BaseCapturerPipeWire(BaseCapturerPipeWire::CaptureSourceType::Screen) {}
+ScreenCapturerPipeWire::~ScreenCapturerPipeWire() {}
+
+// static
+std::unique_ptr<DesktopCapturer>
+ScreenCapturerPipeWire::CreateRawScreenCapturer(
+    const DesktopCaptureOptions& options) {
+  std::unique_ptr<ScreenCapturerPipeWire> capturer(
+      new ScreenCapturerPipeWire());
+
+  return std::move(capturer);
+}
+
+}  // namespace webrtc
diff -up firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/screen_capturer_pipewire.h.firefox-pipewire firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/screen_capturer_pipewire.h
--- firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/screen_capturer_pipewire.h.firefox-pipewire	2018-12-05 13:04:08.833063546 +0100
+++ firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/screen_capturer_pipewire.h	2018-12-05 13:04:08.833063546 +0100
@@ -0,0 +1,33 @@
+/*
+ *  Copyright 2018 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.
+ */
+
+#ifndef MODULES_DESKTOP_CAPTURE_LINUX_SCREEN_CAPTURER_PIPEWIRE_H_
+#define MODULES_DESKTOP_CAPTURE_LINUX_SCREEN_CAPTURER_PIPEWIRE_H_
+
+#include <memory>
+
+#include "webrtc/modules/desktop_capture/base_capturer_pipewire.h"
+
+namespace webrtc {
+
+class ScreenCapturerPipeWire : public BaseCapturerPipeWire {
+ public:
+  ScreenCapturerPipeWire();
+  ~ScreenCapturerPipeWire() override;
+
+  static std::unique_ptr<DesktopCapturer> CreateRawScreenCapturer(
+      const DesktopCaptureOptions& options);
+
+  RTC_DISALLOW_COPY_AND_ASSIGN(ScreenCapturerPipeWire);
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_DESKTOP_CAPTURE_LINUX_SCREEN_CAPTURER_PIPEWIRE_H_
diff -up firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/screen_capturer_x11.cc.firefox-pipewire firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/screen_capturer_x11.cc
--- firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/screen_capturer_x11.cc.firefox-pipewire	2018-12-04 00:34:14.000000000 +0100
+++ firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/screen_capturer_x11.cc	2018-12-05 13:04:08.833063546 +0100
@@ -34,18 +34,20 @@
 namespace webrtc {
 namespace {
 
-// A class to perform video frame capturing for Linux.
+// A class to perform video frame capturing for Linux on X11.
 //
 // If XDamage is used, this class sets DesktopFrame::updated_region() according
 // to the areas reported by XDamage. Otherwise this class does not detect
 // DesktopFrame::updated_region(), the field is always set to the entire frame
 // rectangle. ScreenCapturerDifferWrapper should be used if that functionality
 // is necessary.
-class ScreenCapturerLinux : public DesktopCapturer,
+class ScreenCapturerX11 : public DesktopCapturer,
                             public SharedXDisplay::XEventHandler {
  public:
-  ScreenCapturerLinux();
-  ~ScreenCapturerLinux() override;
+  ScreenCapturerX11();
+  ~ScreenCapturerX11() override;
+
+  static std::unique_ptr<DesktopCapturer> CreateRawScreenCapturer(const DesktopCaptureOptions& options);
 
   // TODO(ajwong): Do we really want this to be synchronous?
   bool Init(const DesktopCaptureOptions& options);
@@ -118,14 +120,13 @@ class ScreenCapturerLinux : public Deskt
   // current with the last buffer used.
   DesktopRegion last_invalid_region_;
 
-  RTC_DISALLOW_COPY_AND_ASSIGN(ScreenCapturerLinux);
+  RTC_DISALLOW_COPY_AND_ASSIGN(ScreenCapturerX11);
 };
-
-ScreenCapturerLinux::ScreenCapturerLinux() {
+ScreenCapturerX11::ScreenCapturerX11() {
   helper_.SetLogGridSize(4);
 }
 
-ScreenCapturerLinux::~ScreenCapturerLinux() {
+ScreenCapturerX11::~ScreenCapturerX11() {
   options_.x_display()->RemoveEventHandler(ConfigureNotify, this);
   if (use_damage_) {
     options_.x_display()->RemoveEventHandler(
@@ -134,7 +135,7 @@ ScreenCapturerLinux::~ScreenCapturerLinu
   DeinitXlib();
 }
 
-bool ScreenCapturerLinux::Init(const DesktopCaptureOptions& options) {
+bool ScreenCapturerX11::Init(const DesktopCaptureOptions& options) {
   options_ = options;
 
   root_window_ = RootWindow(display(), DefaultScreen(display()));
@@ -177,7 +178,7 @@ bool ScreenCapturerLinux::Init(const Des
   return true;
 }
 
-void ScreenCapturerLinux::InitXDamage() {
+void ScreenCapturerX11::InitXDamage() {
   // Our use of XDamage requires XFixes.
   if (!has_xfixes_) {
     return;
@@ -218,18 +219,18 @@ void ScreenCapturerLinux::InitXDamage()
   LOG(LS_INFO) << "Using XDamage extension.";
 }
 
-void ScreenCapturerLinux::Start(Callback* callback) {
+void ScreenCapturerX11::Start(Callback* callback) {
   RTC_DCHECK(!callback_);
   RTC_DCHECK(callback);
 
   callback_ = callback;
 }
 
-void ScreenCapturerLinux::Stop() {
+void ScreenCapturerX11::Stop() {
   callback_ = NULL;
 }
 
-void ScreenCapturerLinux::CaptureFrame() {
+void ScreenCapturerX11::CaptureFrame() {
   int64_t capture_start_time_nanos = rtc::TimeNanos();
 
   queue_.MoveToNextFrame();
@@ -243,6 +244,7 @@ void ScreenCapturerLinux::CaptureFrame()
   // in a good shape.
   if (!x_server_pixel_buffer_.is_initialized()) {
      // We failed to initialize pixel buffer.
+     LOG(LS_ERROR) << "Pixel buffer is not initialized.";
      callback_->OnCaptureResult(Result::ERROR_PERMANENT, nullptr);
      return;
   }
@@ -258,6 +260,7 @@ void ScreenCapturerLinux::CaptureFrame()
 
   std::unique_ptr<DesktopFrame> result = CaptureScreen();
   if (!result) {
+    LOG(LS_WARNING) << "Temporarily failed to capture screen.";
     callback_->OnCaptureResult(Result::ERROR_TEMPORARY, nullptr);
     return;
   }
@@ -268,19 +271,19 @@ void ScreenCapturerLinux::CaptureFrame()
   callback_->OnCaptureResult(Result::SUCCESS, std::move(result));
 }
 
-bool ScreenCapturerLinux::GetSourceList(SourceList* sources) {
+bool ScreenCapturerX11::GetSourceList(SourceList* sources) {
   RTC_DCHECK(sources->size() == 0);
   // TODO(jiayl): implement screen enumeration.
   sources->push_back({0});
   return true;
 }
 
-bool ScreenCapturerLinux::SelectSource(SourceId id) {
+bool ScreenCapturerX11::SelectSource(SourceId id) {
   // TODO(jiayl): implement screen selection.
   return true;
 }
 
-bool ScreenCapturerLinux::HandleXEvent(const XEvent& event) {
+bool ScreenCapturerX11::HandleXEvent(const XEvent& event) {
   if (use_damage_ && (event.type == damage_event_base_ + XDamageNotify)) {
     const XDamageNotifyEvent* damage_event =
         reinterpret_cast<const XDamageNotifyEvent*>(&event);
@@ -295,7 +298,7 @@ bool ScreenCapturerLinux::HandleXEvent(c
   return false;
 }
 
-std::unique_ptr<DesktopFrame> ScreenCapturerLinux::CaptureScreen() {
+std::unique_ptr<DesktopFrame> ScreenCapturerX11::CaptureScreen() {
   std::unique_ptr<SharedDesktopFrame> frame = queue_.current_frame()->Share();
   RTC_DCHECK(x_server_pixel_buffer_.window_size().equals(frame->size()));
 
@@ -345,25 +348,26 @@ std::unique_ptr<DesktopFrame> ScreenCapt
     // Doing full-screen polling, or this is the first capture after a
     // screen-resolution change.  In either case, need a full-screen capture.
     DesktopRect screen_rect = DesktopRect::MakeSize(frame->size());
-    x_server_pixel_buffer_.CaptureRect(screen_rect, frame.get());
+    if (!x_server_pixel_buffer_.CaptureRect(screen_rect, frame.get()))
+      return nullptr;
     updated_region->SetRect(screen_rect);
   }
 
   return std::move(frame);
 }
 
-void ScreenCapturerLinux::ScreenConfigurationChanged() {
+void ScreenCapturerX11::ScreenConfigurationChanged() {
   // Make sure the frame buffers will be reallocated.
   queue_.Reset();
 
   helper_.ClearInvalidRegion();
   if (!x_server_pixel_buffer_.Init(display(), DefaultRootWindow(display()))) {
     LOG(LS_ERROR) << "Failed to initialize pixel buffer after screen "
-        "configuration change.";
+                         "configuration change.";
   }
 }
 
-void ScreenCapturerLinux::SynchronizeFrame() {
+void ScreenCapturerX11::SynchronizeFrame() {
   // Synchronize the current buffer with the previous one since we do not
   // capture the entire desktop. Note that encoder may be reading from the
   // previous buffer at this time so thread access complaints are false
@@ -383,7 +387,7 @@ void ScreenCapturerLinux::SynchronizeFra
   }
 }
 
-void ScreenCapturerLinux::DeinitXlib() {
+void ScreenCapturerX11::DeinitXlib() {
   if (gc_) {
     XFreeGC(display(), gc_);
     gc_ = nullptr;
@@ -407,17 +411,17 @@ void ScreenCapturerLinux::DeinitXlib() {
 }  // namespace
 
 // static
-std::unique_ptr<DesktopCapturer> DesktopCapturer::CreateRawScreenCapturer(
+std::unique_ptr<DesktopCapturer> ScreenCapturerX11::CreateRawScreenCapturer(
     const DesktopCaptureOptions& options) {
   if (!options.x_display())
     return nullptr;
 
-  std::unique_ptr<ScreenCapturerLinux> capturer(new ScreenCapturerLinux());
+  std::unique_ptr<ScreenCapturerX11> capturer(new ScreenCapturerX11());
   if (!capturer.get()->Init(options)) {
     return nullptr;
   }
 
-  return std::unique_ptr<DesktopCapturer>(capturer.release());
+  return std::move(capturer);
 }
 
 }  // namespace webrtc
diff -up firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/window_capturer_linux.cc.firefox-pipewire firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/window_capturer_linux.cc
--- firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/window_capturer_linux.cc.firefox-pipewire	2018-12-05 13:04:08.833063546 +0100
+++ firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/window_capturer_linux.cc	2018-12-05 13:04:08.833063546 +0100
@@ -0,0 +1,40 @@
+/*
+ *  Copyright 2018 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 "webrtc/modules/desktop_capture/desktop_capture_options.h"
+#include "webrtc/modules/desktop_capture/desktop_capturer.h"
+
+#if defined(USE_PIPEWIRE)
+#include "webrtc/modules/desktop_capture/window_capturer_pipewire.h"
+#endif  // defined(USE_PIPEWIRE)
+
+#if defined(USE_X11)
+#include "webrtc/modules/desktop_capture/window_capturer_x11.cc"
+#endif  // defined(USE_X11)
+
+namespace webrtc {
+
+// static
+std::unique_ptr<DesktopCapturer> DesktopCapturer::CreateRawWindowCapturer(
+    const DesktopCaptureOptions& options) {
+#if defined(USE_PIPEWIRE)
+  if (DesktopCapturer::IsRunningUnderWayland()) {
+    return WindowCapturerPipeWire::CreateRawWindowCapturer(options);
+  }
+#endif  // defined(USE_PIPEWIRE)
+
+#if defined(USE_X11)
+  return WindowCapturerX11::CreateRawWindowCapturer(options);
+#endif  // defined(USE_X11)
+
+  return nullptr;
+}
+
+}  // namespace webrtc
diff -up firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/window_capturer_null.cc.firefox-pipewire firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/window_capturer_null.cc
--- firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/window_capturer_null.cc.firefox-pipewire	2018-12-04 00:34:14.000000000 +0100
+++ firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/window_capturer_null.cc	2018-12-05 13:04:08.833063546 +0100
@@ -67,10 +67,12 @@ void WindowCapturerNull::CaptureFrame()
 
 }  // namespace
 
+#if not defined(USE_PIPEWIRE)
 // static
 std::unique_ptr<DesktopCapturer> DesktopCapturer::CreateRawWindowCapturer(
     const DesktopCaptureOptions& options) {
   return std::unique_ptr<DesktopCapturer>(new WindowCapturerNull());
 }
+#endif // not defined(USE_PIPEWIRE)
 
 }  // namespace webrtc
diff -up firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/window_capturer_pipewire.cc.firefox-pipewire firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/window_capturer_pipewire.cc
--- firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/window_capturer_pipewire.cc.firefox-pipewire	2018-12-05 13:04:08.833063546 +0100
+++ firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/window_capturer_pipewire.cc	2018-12-05 13:04:08.833063546 +0100
@@ -0,0 +1,28 @@
+/*
+ *  Copyright 2018 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 "webrtc/modules/desktop_capture/window_capturer_pipewire.h"
+
+namespace webrtc {
+
+WindowCapturerPipeWire::WindowCapturerPipeWire()
+    : BaseCapturerPipeWire(BaseCapturerPipeWire::CaptureSourceType::Window) {}
+WindowCapturerPipeWire::~WindowCapturerPipeWire() {}
+
+// static
+std::unique_ptr<DesktopCapturer>
+WindowCapturerPipeWire::CreateRawWindowCapturer(
+    const DesktopCaptureOptions& options) {
+  std::unique_ptr<WindowCapturerPipeWire> capturer(
+      new WindowCapturerPipeWire());
+
+  return std::move(capturer);
+}
+}  // namespace webrtc
diff -up firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/window_capturer_pipewire.h.firefox-pipewire firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/window_capturer_pipewire.h
--- firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/window_capturer_pipewire.h.firefox-pipewire	2018-12-05 13:04:08.833063546 +0100
+++ firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/window_capturer_pipewire.h	2018-12-05 13:04:08.833063546 +0100
@@ -0,0 +1,33 @@
+/*
+ *  Copyright 2018 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.
+ */
+
+#ifndef MODULES_DESKTOP_CAPTURE_LINUX_WINDOW_CAPTURER_PIPEWIRE_H_
+#define MODULES_DESKTOP_CAPTURE_LINUX_WINDOW_CAPTURER_PIPEWIRE_H_
+
+#include <memory>
+
+#include "webrtc/modules/desktop_capture/base_capturer_pipewire.h"
+
+namespace webrtc {
+
+class WindowCapturerPipeWire : public BaseCapturerPipeWire {
+ public:
+  WindowCapturerPipeWire();
+  ~WindowCapturerPipeWire() override;
+
+  static std::unique_ptr<DesktopCapturer> CreateRawWindowCapturer(
+      const DesktopCaptureOptions& options);
+
+  RTC_DISALLOW_COPY_AND_ASSIGN(WindowCapturerPipeWire);
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_DESKTOP_CAPTURE_LINUX_WINDOW_CAPTURER_PIPEWIRE_H_
diff -up firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/window_capturer_x11.cc.firefox-pipewire firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/window_capturer_x11.cc
--- firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/window_capturer_x11.cc.firefox-pipewire	2018-12-04 00:34:14.000000000 +0100
+++ firefox-64.0/media/webrtc/trunk/webrtc/modules/desktop_capture/window_capturer_x11.cc	2018-12-05 13:04:08.833063546 +0100
@@ -32,11 +32,13 @@ namespace webrtc {
 
 namespace {
 
-class WindowCapturerLinux : public DesktopCapturer,
+class WindowCapturerX11 : public DesktopCapturer,
                             public SharedXDisplay::XEventHandler {
  public:
-  WindowCapturerLinux(const DesktopCaptureOptions& options);
-  ~WindowCapturerLinux() override;
+  WindowCapturerX11(const DesktopCaptureOptions& options);
+  ~WindowCapturerX11() override;
+
+  static std::unique_ptr<DesktopCapturer> CreateRawWindowCapturer(const DesktopCaptureOptions& options);
 
   // DesktopCapturer interface.
   void Start(Callback* callback) override;
@@ -78,10 +80,10 @@ class WindowCapturerLinux : public Deskt
   ::Window selected_window_ = 0;
   XServerPixelBuffer x_server_pixel_buffer_;
 
-  RTC_DISALLOW_COPY_AND_ASSIGN(WindowCapturerLinux);
+  RTC_DISALLOW_COPY_AND_ASSIGN(WindowCapturerX11);
 };
 
-WindowCapturerLinux::WindowCapturerLinux(const DesktopCaptureOptions& options)
+WindowCapturerX11::WindowCapturerX11(const DesktopCaptureOptions& options)
     : x_display_(options.x_display()) {
   // Create Atoms so we don't need to do it every time they are used.
   wm_state_atom_ = XInternAtom(display(), "WM_STATE", True);
@@ -102,11 +104,11 @@ WindowCapturerLinux::WindowCapturerLinux
   x_display_->AddEventHandler(ConfigureNotify, this);
 }
 
-WindowCapturerLinux::~WindowCapturerLinux() {
+WindowCapturerX11::~WindowCapturerX11() {
   x_display_->RemoveEventHandler(ConfigureNotify, this);
 }
 
-bool WindowCapturerLinux::GetSourceList(SourceList* sources) {
+bool WindowCapturerX11::GetSourceList(SourceList* sources) {
   SourceList result;
 
   XErrorTrap error_trap(display());
@@ -159,7 +161,7 @@ bool WindowCapturerLinux::GetSourceList(
   return true;
 }
 
-bool WindowCapturerLinux::SelectSource(SourceId id) {
+bool WindowCapturerX11::SelectSource(SourceId id) {
   if (!x_server_pixel_buffer_.Init(display(), id))
     return false;
 
@@ -180,7 +182,7 @@ bool WindowCapturerLinux::SelectSource(S
   return true;
 }
 
-bool WindowCapturerLinux::FocusOnSelectedSource() {
+bool WindowCapturerX11::FocusOnSelectedSource() {
   if (!selected_window_)
     return false;
 
@@ -229,18 +231,18 @@ bool WindowCapturerLinux::FocusOnSelecte
   return true;
 }
 
-void WindowCapturerLinux::Start(Callback* callback) {
+void WindowCapturerX11::Start(Callback* callback) {
   assert(!callback_);
   assert(callback);
 
   callback_ = callback;
 }
 
-void WindowCapturerLinux::Stop() {
+void WindowCapturerX11::Stop() {
   callback_ = NULL;
 }
 
-void WindowCapturerLinux::CaptureFrame() {
+void WindowCapturerX11::CaptureFrame() {
   x_display_->ProcessPendingXEvents();
 
   if (!x_server_pixel_buffer_.IsWindowValid()) {
@@ -274,7 +276,7 @@ void WindowCapturerLinux::CaptureFrame()
   callback_->OnCaptureResult(Result::SUCCESS, std::move(frame));
 }
 
-bool WindowCapturerLinux::HandleXEvent(const XEvent& event) {
+bool WindowCapturerX11::HandleXEvent(const XEvent& event) {
   if (event.type == ConfigureNotify) {
     XConfigureEvent xce = event.xconfigure;
     if (!DesktopSize(xce.width, xce.height).equals(
@@ -288,7 +290,7 @@ bool WindowCapturerLinux::HandleXEvent(c
   return false;
 }
 
-::Window WindowCapturerLinux::GetApplicationWindow(::Window window) {
+::Window WindowCapturerX11::GetApplicationWindow(::Window window) {
   // Get WM_STATE property of the window.
   XWindowProperty<uint32_t> window_state(display(), window, wm_state_atom_);
 
@@ -326,7 +328,7 @@ bool WindowCapturerLinux::HandleXEvent(c
   return app_window;
 }
 
-bool WindowCapturerLinux::IsDesktopElement(::Window window) {
+bool WindowCapturerX11::IsDesktopElement(::Window window) {
   if (window == 0)
     return false;
 
@@ -361,7 +363,7 @@ bool WindowCapturerLinux::IsDesktopEleme
   return result;
 }
 
-bool WindowCapturerLinux::GetWindowTitle(::Window window, std::string* title) {
+bool WindowCapturerX11::GetWindowTitle(::Window window, std::string* title) {
   int status;
   bool result = false;
   XTextProperty window_name;
@@ -392,7 +394,7 @@ bool WindowCapturerLinux::GetWindowTitle
 
 }  // namespace
 
-int WindowCapturerLinux::GetWindowProcessID(::Window window) {
+int WindowCapturerX11::GetWindowProcessID(::Window window) {
   // Get _NET_WM_PID property of the window.
   Atom process_atom = XInternAtom(display(), "_NET_WM_PID", True);
   XWindowProperty<uint32_t> process_id(display(), window, process_atom);
@@ -401,11 +403,11 @@ int WindowCapturerLinux::GetWindowProces
 }
 
 // static
-std::unique_ptr<DesktopCapturer> DesktopCapturer::CreateRawWindowCapturer(
+std::unique_ptr<DesktopCapturer> WindowCapturerX11::CreateRawWindowCapturer(
     const DesktopCaptureOptions& options) {
   if (!options.x_display())
     return nullptr;
-  return std::unique_ptr<DesktopCapturer>(new WindowCapturerLinux(options));
+  return std::unique_ptr<DesktopCapturer>(new WindowCapturerX11(options));
 }
 
 }  // namespace webrtc