modules/video_capture/linux/pipewire_session.cc - src/ - Git at Google

 /*
  *  Copyright (c) 2022 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */

 #include "modules/video_capture/linux/pipewire_session.h"

 #include <spa/monitor/device.h>
 #include <spa/param/format-utils.h>
 #include <spa/param/format.h>
 #include <spa/param/video/raw.h>
 #include <spa/pod/parser.h>

 #include "common_video/libyuv/include/webrtc_libyuv.h"
 #include "modules/video_capture/device_info_impl.h"
 #include "rtc_base/logging.h"
 #include "rtc_base/string_encode.h"
 #include "rtc_base/string_to_number.h"

 namespace webrtc {
 namespace videocapturemodule {

 VideoType PipeWireRawFormatToVideoType(uint32_t id) {
   switch (id) {
     case SPA_VIDEO_FORMAT_I420:
       return VideoType::kI420;
     case SPA_VIDEO_FORMAT_NV12:
       return VideoType::kNV12;
     case SPA_VIDEO_FORMAT_YUY2:
       return VideoType::kYUY2;
     case SPA_VIDEO_FORMAT_UYVY:
       return VideoType::kUYVY;
     case SPA_VIDEO_FORMAT_RGB:
       return VideoType::kRGB24;
     default:
       return VideoType::kUnknown;
   }
 }

 PipeWireNode::PipeWireNode(PipeWireSession* session,
                            uint32_t id,
                            const spa_dict* props)
     : session_(session),
       id_(id),
       display_name_(spa_dict_lookup(props, PW_KEY_NODE_DESCRIPTION)),
       unique_id_(rtc::ToString(id)) {
   RTC_LOG(LS_VERBOSE) << "Found Camera: " << display_name_;

   proxy_ = static_cast<pw_proxy*>(pw_registry_bind(
       session_->pw_registry_, id, PW_TYPE_INTERFACE_Node, PW_VERSION_NODE, 0));

   static const pw_node_events node_events{
       .version = PW_VERSION_NODE_EVENTS,
       .info = OnNodeInfo,
       .param = OnNodeParam,
   };

   pw_node_add_listener(proxy_, &node_listener_, &node_events, this);
 }

 PipeWireNode::~PipeWireNode() {
   pw_proxy_destroy(proxy_);
   spa_hook_remove(&node_listener_);
 }

 // static
 void PipeWireNode::OnNodeInfo(void* data, const pw_node_info* info) {
   PipeWireNode* that = static_cast<PipeWireNode*>(data);

   if (info->change_mask & PW_NODE_CHANGE_MASK_PROPS) {
     const char* vid_str;
     const char* pid_str;
     absl::optional<int> vid;
     absl::optional<int> pid;

     vid_str = spa_dict_lookup(info->props, SPA_KEY_DEVICE_VENDOR_ID);
     pid_str = spa_dict_lookup(info->props, SPA_KEY_DEVICE_PRODUCT_ID);
     vid = vid_str ? rtc::StringToNumber<int>(vid_str) : absl::nullopt;
     pid = pid_str ? rtc::StringToNumber<int>(pid_str) : absl::nullopt;

     if (vid && pid) {
       char model_str[10];
       snprintf(model_str, sizeof(model_str), "%04x:%04x", vid.value(),
                pid.value());
       that->model_id_ = model_str;
     }
   } else if (info->change_mask & PW_NODE_CHANGE_MASK_PARAMS) {
     for (uint32_t i = 0; i < info->n_params; i++) {
       uint32_t id = info->params[i].id;
       if (id == SPA_PARAM_EnumFormat &&
           info->params[i].flags & SPA_PARAM_INFO_READ) {
         pw_node_enum_params(that->proxy_, 0, id, 0, UINT32_MAX, nullptr);
         break;
       }
     }
     that->session_->PipeWireSync();
   }
 }

 // static
 void PipeWireNode::OnNodeParam(void* data,
                                int seq,
                                uint32_t id,
                                uint32_t index,
                                uint32_t next,
                                const spa_pod* param) {
   PipeWireNode* that = static_cast<PipeWireNode*>(data);
   auto* obj = reinterpret_cast<const spa_pod_object*>(param);
   const spa_pod_prop* prop = nullptr;
   VideoCaptureCapability cap;
   spa_pod* val;
   uint32_t n_items, choice;

   cap.videoType = VideoType::kUnknown;
   cap.maxFPS = 0;

   prop = spa_pod_object_find_prop(obj, prop, SPA_FORMAT_VIDEO_framerate);
   if (prop) {
     val = spa_pod_get_values(&prop->value, &n_items, &choice);
     if (val->type == SPA_TYPE_Fraction) {
       spa_fraction* fract;

       fract = static_cast<spa_fraction*>(SPA_POD_BODY(val));

       if (choice == SPA_CHOICE_None)
         cap.maxFPS = 1.0 * fract[0].num / fract[0].denom;
       else if (choice == SPA_CHOICE_Range && fract[1].num > 0)
         cap.maxFPS = 1.0 * fract[1].num / fract[1].denom;
     }
   }

   prop = spa_pod_object_find_prop(obj, prop, SPA_FORMAT_VIDEO_size);
   if (!prop)
     return;

   val = spa_pod_get_values(&prop->value, &n_items, &choice);
   if (val->type != SPA_TYPE_Rectangle)
     return;

   if (choice != SPA_CHOICE_None)
     return;

   if (!ParseFormat(param, &cap))
     return;

   spa_rectangle* rect;
   rect = static_cast<spa_rectangle*>(SPA_POD_BODY(val));
   cap.width = rect[0].width;
   cap.height = rect[0].height;

   RTC_LOG(LS_VERBOSE) << "Found Format(" << that->display_name_
                       << "): " << static_cast<int>(cap.videoType) << "("
                       << cap.width << "x" << cap.height << "@" << cap.maxFPS
                       << ")";

   that->capabilities_.push_back(cap);
 }

 // static
 bool PipeWireNode::ParseFormat(const spa_pod* param,
                                VideoCaptureCapability* cap) {
   auto* obj = reinterpret_cast<const spa_pod_object*>(param);
   uint32_t media_type, media_subtype;

   if (spa_format_parse(param, &media_type, &media_subtype) < 0) {
     RTC_LOG(LS_ERROR) << "Failed to parse video format.";
     return false;
   }

   if (media_type != SPA_MEDIA_TYPE_video)
     return false;

   if (media_subtype == SPA_MEDIA_SUBTYPE_raw) {
     const spa_pod_prop* prop = nullptr;
     uint32_t n_items, choice;
     spa_pod* val;
     uint32_t* id;

     prop = spa_pod_object_find_prop(obj, prop, SPA_FORMAT_VIDEO_format);
     if (!prop)
       return false;

     val = spa_pod_get_values(&prop->value, &n_items, &choice);
     if (val->type != SPA_TYPE_Id)
       return false;

     if (choice != SPA_CHOICE_None)
       return false;

     id = static_cast<uint32_t*>(SPA_POD_BODY(val));

     cap->videoType = PipeWireRawFormatToVideoType(id[0]);
     if (cap->videoType == VideoType::kUnknown) {
       RTC_LOG(LS_INFO) << "Unsupported PipeWire pixel format " << id[0];
       return false;
     }

   } else if (media_subtype == SPA_MEDIA_SUBTYPE_mjpg) {
     cap->videoType = VideoType::kMJPEG;
   } else {
     RTC_LOG(LS_INFO) << "Unsupported PipeWire media subtype " << media_subtype;
   }

   return cap->videoType != VideoType::kUnknown;
 }

 CameraPortalNotifier::CameraPortalNotifier(PipeWireSession* session)
     : session_(session) {}

 void CameraPortalNotifier::OnCameraRequestResult(
     xdg_portal::RequestResponse result,
     int fd) {
   if (result == xdg_portal::RequestResponse::kSuccess) {
     session_->InitPipeWire(fd);
   } else if (result == xdg_portal::RequestResponse::kUserCancelled) {
     session_->Finish(VideoCaptureOptions::Status::DENIED);
   } else {
     session_->Finish(VideoCaptureOptions::Status::ERROR);
   }
 }

 PipeWireSession::PipeWireSession()
     : status_(VideoCaptureOptions::Status::UNINITIALIZED) {}

 PipeWireSession::~PipeWireSession() {
   Cleanup();
 }

 void PipeWireSession::Init(VideoCaptureOptions::Callback* callback, int fd) {
   {
     webrtc::MutexLock lock(&callback_lock_);
     callback_ = callback;
   }

   if (fd != kInvalidPipeWireFd) {
     InitPipeWire(fd);
   } else {
     portal_notifier_ = std::make_unique<CameraPortalNotifier>(this);
     portal_ = std::make_unique<CameraPortal>(portal_notifier_.get());
     portal_->Start();
   }
 }

 void PipeWireSession::InitPipeWire(int fd) {
   if (!InitializePipeWire())
     Finish(VideoCaptureOptions::Status::UNAVAILABLE);

   if (!StartPipeWire(fd))
     Finish(VideoCaptureOptions::Status::ERROR);
 }

 bool PipeWireSession::StartPipeWire(int fd) {
   pw_init(/*argc=*/nullptr, /*argv=*/nullptr);

   pw_main_loop_ = pw_thread_loop_new("pipewire-main-loop", nullptr);

   pw_context_ =
       pw_context_new(pw_thread_loop_get_loop(pw_main_loop_), nullptr, 0);
   if (!pw_context_) {
     RTC_LOG(LS_ERROR) << "Failed to create PipeWire context";
     return false;
   }

   pw_core_ = pw_context_connect_fd(pw_context_, fd, nullptr, 0);
   if (!pw_core_) {
     RTC_LOG(LS_ERROR) << "Failed to connect PipeWire context";
     return false;
   }

   static const pw_core_events core_events{
       .version = PW_VERSION_CORE_EVENTS,
       .done = &OnCoreDone,
       .error = &OnCoreError,
   };

   pw_core_add_listener(pw_core_, &core_listener_, &core_events, this);

   static const pw_registry_events registry_events{
       .version = PW_VERSION_REGISTRY_EVENTS,
       .global = OnRegistryGlobal,
       .global_remove = OnRegistryGlobalRemove,
   };

   pw_registry_ = pw_core_get_registry(pw_core_, PW_VERSION_REGISTRY, 0);
   pw_registry_add_listener(pw_registry_, &registry_listener_, &registry_events,
                            this);

   PipeWireSync();

   if (pw_thread_loop_start(pw_main_loop_) < 0) {
     RTC_LOG(LS_ERROR) << "Failed to start main PipeWire loop";
     return false;
   }

   return true;
 }

 void PipeWireSession::StopPipeWire() {
   if (pw_main_loop_)
     pw_thread_loop_stop(pw_main_loop_);

   if (pw_core_) {
     pw_core_disconnect(pw_core_);
     pw_core_ = nullptr;
   }

   if (pw_context_) {
     pw_context_destroy(pw_context_);
     pw_context_ = nullptr;
   }

   if (pw_main_loop_) {
     pw_thread_loop_destroy(pw_main_loop_);
     pw_main_loop_ = nullptr;
   }
 }

 void PipeWireSession::PipeWireSync() {
   sync_seq_ = pw_core_sync(pw_core_, PW_ID_CORE, sync_seq_);
 }

 // static
 void PipeWireSession::OnCoreError(void* data,
                                   uint32_t id,
                                   int seq,
                                   int res,
                                   const char* message) {
   RTC_LOG(LS_ERROR) << "PipeWire remote error: " << message;
 }

 // static
 void PipeWireSession::OnCoreDone(void* data, uint32_t id, int seq) {
   PipeWireSession* that = static_cast<PipeWireSession*>(data);

   if (id == PW_ID_CORE) {
     if (seq == that->sync_seq_) {
       RTC_LOG(LS_VERBOSE) << "Enumerating PipeWire camera devices complete.";
       that->Finish(VideoCaptureOptions::Status::SUCCESS);
     }
   }
 }

 // static
 void PipeWireSession::OnRegistryGlobal(void* data,
                                        uint32_t id,
                                        uint32_t permissions,
                                        const char* type,
                                        uint32_t version,
                                        const spa_dict* props) {
   PipeWireSession* that = static_cast<PipeWireSession*>(data);

   if (type != absl::string_view(PW_TYPE_INTERFACE_Node))
     return;

   if (!spa_dict_lookup(props, PW_KEY_NODE_DESCRIPTION))
     return;

   auto node_role = spa_dict_lookup(props, PW_KEY_MEDIA_ROLE);
   if (!node_role || strcmp(node_role, "Camera"))
     return;

   that->nodes_.emplace_back(that, id, props);
   that->PipeWireSync();
 }

 // static
 void PipeWireSession::OnRegistryGlobalRemove(void* data, uint32_t id) {
   PipeWireSession* that = static_cast<PipeWireSession*>(data);

   for (auto it = that->nodes_.begin(); it != that->nodes().end(); ++it) {
     if ((*it).id() == id) {
       that->nodes_.erase(it);
       break;
     }
   }
 }

 void PipeWireSession::Finish(VideoCaptureOptions::Status status) {
   webrtc::MutexLock lock(&callback_lock_);

   if (callback_) {
     callback_->OnInitialized(status);
     callback_ = nullptr;
   }
 }

 void PipeWireSession::Cleanup() {
   webrtc::MutexLock lock(&callback_lock_);
   callback_ = nullptr;

   StopPipeWire();
 }

 }  // namespace videocapturemodule
 }  // namespace webrtc
	/*
	* Copyright (c) 2022 The WebRTC project authors. All Rights Reserved.
	*
	* Use of this source code is governed by a BSD-style license
	* that can be found in the LICENSE file in the root of the source
	* tree. An additional intellectual property rights grant can be found
	* in the file PATENTS. All contributing project authors may
	* be found in the AUTHORS file in the root of the source tree.
	*/

	#include "modules/video_capture/linux/pipewire_session.h"

	#include <spa/monitor/device.h>
	#include <spa/param/format-utils.h>
	#include <spa/param/format.h>
	#include <spa/param/video/raw.h>
	#include <spa/pod/parser.h>

	#include "common_video/libyuv/include/webrtc_libyuv.h"
	#include "modules/video_capture/device_info_impl.h"
	#include "rtc_base/logging.h"
	#include "rtc_base/string_encode.h"
	#include "rtc_base/string_to_number.h"

	namespace webrtc {
	namespace videocapturemodule {

	VideoType PipeWireRawFormatToVideoType(uint32_t id) {
	switch (id) {
	case SPA_VIDEO_FORMAT_I420:
	return VideoType::kI420;
	case SPA_VIDEO_FORMAT_NV12:
	return VideoType::kNV12;
	case SPA_VIDEO_FORMAT_YUY2:
	return VideoType::kYUY2;
	case SPA_VIDEO_FORMAT_UYVY:
	return VideoType::kUYVY;
	case SPA_VIDEO_FORMAT_RGB:
	return VideoType::kRGB24;
	default:
	return VideoType::kUnknown;
	}
	}

	PipeWireNode::PipeWireNode(PipeWireSession* session,
	uint32_t id,
	const spa_dict* props)
	: session_(session),
	id_(id),
	display_name_(spa_dict_lookup(props, PW_KEY_NODE_DESCRIPTION)),
	unique_id_(rtc::ToString(id)) {
	RTC_LOG(LS_VERBOSE) << "Found Camera: " << display_name_;

	proxy_ = static_cast<pw_proxy*>(pw_registry_bind(
	session_->pw_registry_, id, PW_TYPE_INTERFACE_Node, PW_VERSION_NODE, 0));

	static const pw_node_events node_events{
	.version = PW_VERSION_NODE_EVENTS,
	.info = OnNodeInfo,
	.param = OnNodeParam,
	};

	pw_node_add_listener(proxy_, &node_listener_, &node_events, this);
	}

	PipeWireNode::~PipeWireNode() {
	pw_proxy_destroy(proxy_);
	spa_hook_remove(&node_listener_);
	}

	// static
	void PipeWireNode::OnNodeInfo(void* data, const pw_node_info* info) {
	PipeWireNode* that = static_cast<PipeWireNode*>(data);

	if (info->change_mask & PW_NODE_CHANGE_MASK_PROPS) {
	const char* vid_str;
	const char* pid_str;
	absl::optional<int> vid;
	absl::optional<int> pid;

	vid_str = spa_dict_lookup(info->props, SPA_KEY_DEVICE_VENDOR_ID);
	pid_str = spa_dict_lookup(info->props, SPA_KEY_DEVICE_PRODUCT_ID);
	vid = vid_str ? rtc::StringToNumber<int>(vid_str) : absl::nullopt;
	pid = pid_str ? rtc::StringToNumber<int>(pid_str) : absl::nullopt;

	if (vid && pid) {
	char model_str[10];
	snprintf(model_str, sizeof(model_str), "%04x:%04x", vid.value(),
	pid.value());
	that->model_id_ = model_str;
	}
	} else if (info->change_mask & PW_NODE_CHANGE_MASK_PARAMS) {
	for (uint32_t i = 0; i < info->n_params; i++) {
	uint32_t id = info->params[i].id;
	if (id == SPA_PARAM_EnumFormat &&
	info->params[i].flags & SPA_PARAM_INFO_READ) {
	pw_node_enum_params(that->proxy_, 0, id, 0, UINT32_MAX, nullptr);
	break;
	}
	}
	that->session_->PipeWireSync();
	}
	}

	// static
	void PipeWireNode::OnNodeParam(void* data,
	int seq,
	uint32_t id,
	uint32_t index,
	uint32_t next,
	const spa_pod* param) {
	PipeWireNode* that = static_cast<PipeWireNode*>(data);
	auto* obj = reinterpret_cast<const spa_pod_object*>(param);
	const spa_pod_prop* prop = nullptr;
	VideoCaptureCapability cap;
	spa_pod* val;
	uint32_t n_items, choice;

	cap.videoType = VideoType::kUnknown;
	cap.maxFPS = 0;

	prop = spa_pod_object_find_prop(obj, prop, SPA_FORMAT_VIDEO_framerate);
	if (prop) {
	val = spa_pod_get_values(&prop->value, &n_items, &choice);
	if (val->type == SPA_TYPE_Fraction) {
	spa_fraction* fract;

	fract = static_cast<spa_fraction*>(SPA_POD_BODY(val));

	if (choice == SPA_CHOICE_None)
	cap.maxFPS = 1.0 * fract[0].num / fract[0].denom;
	else if (choice == SPA_CHOICE_Range && fract[1].num > 0)
	cap.maxFPS = 1.0 * fract[1].num / fract[1].denom;
	}
	}

	prop = spa_pod_object_find_prop(obj, prop, SPA_FORMAT_VIDEO_size);
	if (!prop)
	return;

	val = spa_pod_get_values(&prop->value, &n_items, &choice);
	if (val->type != SPA_TYPE_Rectangle)
	return;

	if (choice != SPA_CHOICE_None)
	return;

	if (!ParseFormat(param, &cap))
	return;

	spa_rectangle* rect;
	rect = static_cast<spa_rectangle*>(SPA_POD_BODY(val));
	cap.width = rect[0].width;
	cap.height = rect[0].height;

	RTC_LOG(LS_VERBOSE) << "Found Format(" << that->display_name_
	<< "): " << static_cast<int>(cap.videoType) << "("
	<< cap.width << "x" << cap.height << "@" << cap.maxFPS
	<< ")";

	that->capabilities_.push_back(cap);
	}

	// static
	bool PipeWireNode::ParseFormat(const spa_pod* param,
	VideoCaptureCapability* cap) {
	auto* obj = reinterpret_cast<const spa_pod_object*>(param);
	uint32_t media_type, media_subtype;

	if (spa_format_parse(param, &media_type, &media_subtype) < 0) {
	RTC_LOG(LS_ERROR) << "Failed to parse video format.";
	return false;
	}

	if (media_type != SPA_MEDIA_TYPE_video)
	return false;

	if (media_subtype == SPA_MEDIA_SUBTYPE_raw) {
	const spa_pod_prop* prop = nullptr;
	uint32_t n_items, choice;
	spa_pod* val;
	uint32_t* id;

	prop = spa_pod_object_find_prop(obj, prop, SPA_FORMAT_VIDEO_format);
	if (!prop)
	return false;

	val = spa_pod_get_values(&prop->value, &n_items, &choice);
	if (val->type != SPA_TYPE_Id)
	return false;

	if (choice != SPA_CHOICE_None)
	return false;

	id = static_cast<uint32_t*>(SPA_POD_BODY(val));

	cap->videoType = PipeWireRawFormatToVideoType(id[0]);
	if (cap->videoType == VideoType::kUnknown) {
	RTC_LOG(LS_INFO) << "Unsupported PipeWire pixel format " << id[0];
	return false;
	}

	} else if (media_subtype == SPA_MEDIA_SUBTYPE_mjpg) {
	cap->videoType = VideoType::kMJPEG;
	} else {
	RTC_LOG(LS_INFO) << "Unsupported PipeWire media subtype " << media_subtype;
	}

	return cap->videoType != VideoType::kUnknown;
	}

	CameraPortalNotifier::CameraPortalNotifier(PipeWireSession* session)
	: session_(session) {}

	void CameraPortalNotifier::OnCameraRequestResult(
	xdg_portal::RequestResponse result,
	int fd) {
	if (result == xdg_portal::RequestResponse::kSuccess) {
	session_->InitPipeWire(fd);
	} else if (result == xdg_portal::RequestResponse::kUserCancelled) {
	session_->Finish(VideoCaptureOptions::Status::DENIED);
	} else {
	session_->Finish(VideoCaptureOptions::Status::ERROR);
	}
	}

	PipeWireSession::PipeWireSession()
	: status_(VideoCaptureOptions::Status::UNINITIALIZED) {}

	PipeWireSession::~PipeWireSession() {
	Cleanup();
	}

	void PipeWireSession::Init(VideoCaptureOptions::Callback* callback, int fd) {
	{
	webrtc::MutexLock lock(&callback_lock_);
	callback_ = callback;
	}

	if (fd != kInvalidPipeWireFd) {
	InitPipeWire(fd);
	} else {
	portal_notifier_ = std::make_unique<CameraPortalNotifier>(this);
	portal_ = std::make_unique<CameraPortal>(portal_notifier_.get());
	portal_->Start();
	}
	}

	void PipeWireSession::InitPipeWire(int fd) {
	if (!InitializePipeWire())
	Finish(VideoCaptureOptions::Status::UNAVAILABLE);

	if (!StartPipeWire(fd))
	Finish(VideoCaptureOptions::Status::ERROR);
	}

	bool PipeWireSession::StartPipeWire(int fd) {
	pw_init(/argc=/nullptr, /argv=/nullptr);

	pw_main_loop_ = pw_thread_loop_new("pipewire-main-loop", nullptr);

	pw_context_ =
	pw_context_new(pw_thread_loop_get_loop(pw_main_loop_), nullptr, 0);
	if (!pw_context_) {
	RTC_LOG(LS_ERROR) << "Failed to create PipeWire context";
	return false;
	}

	pw_core_ = pw_context_connect_fd(pw_context_, fd, nullptr, 0);
	if (!pw_core_) {
	RTC_LOG(LS_ERROR) << "Failed to connect PipeWire context";
	return false;
	}

	static const pw_core_events core_events{
	.version = PW_VERSION_CORE_EVENTS,
	.done = &OnCoreDone,
	.error = &OnCoreError,
	};

	pw_core_add_listener(pw_core_, &core_listener_, &core_events, this);

	static const pw_registry_events registry_events{
	.version = PW_VERSION_REGISTRY_EVENTS,
	.global = OnRegistryGlobal,
	.global_remove = OnRegistryGlobalRemove,
	};

	pw_registry_ = pw_core_get_registry(pw_core_, PW_VERSION_REGISTRY, 0);
	pw_registry_add_listener(pw_registry_, &registry_listener_, &registry_events,
	this);

	PipeWireSync();

	if (pw_thread_loop_start(pw_main_loop_) < 0) {
	RTC_LOG(LS_ERROR) << "Failed to start main PipeWire loop";
	return false;
	}

	return true;
	}

	void PipeWireSession::StopPipeWire() {
	if (pw_main_loop_)
	pw_thread_loop_stop(pw_main_loop_);

	if (pw_core_) {
	pw_core_disconnect(pw_core_);
	pw_core_ = nullptr;
	}

	if (pw_context_) {
	pw_context_destroy(pw_context_);
	pw_context_ = nullptr;
	}

	if (pw_main_loop_) {
	pw_thread_loop_destroy(pw_main_loop_);
	pw_main_loop_ = nullptr;
	}
	}

	void PipeWireSession::PipeWireSync() {
	sync_seq_ = pw_core_sync(pw_core_, PW_ID_CORE, sync_seq_);
	}

	// static
	void PipeWireSession::OnCoreError(void* data,
	uint32_t id,
	int seq,
	int res,
	const char* message) {
	RTC_LOG(LS_ERROR) << "PipeWire remote error: " << message;
	}

	// static
	void PipeWireSession::OnCoreDone(void* data, uint32_t id, int seq) {
	PipeWireSession* that = static_cast<PipeWireSession*>(data);

	if (id == PW_ID_CORE) {
	if (seq == that->sync_seq_) {
	RTC_LOG(LS_VERBOSE) << "Enumerating PipeWire camera devices complete.";
	that->Finish(VideoCaptureOptions::Status::SUCCESS);
	}
	}
	}

	// static
	void PipeWireSession::OnRegistryGlobal(void* data,
	uint32_t id,
	uint32_t permissions,
	const char* type,
	uint32_t version,
	const spa_dict* props) {
	PipeWireSession* that = static_cast<PipeWireSession*>(data);

	if (type != absl::string_view(PW_TYPE_INTERFACE_Node))
	return;

	if (!spa_dict_lookup(props, PW_KEY_NODE_DESCRIPTION))
	return;

	auto node_role = spa_dict_lookup(props, PW_KEY_MEDIA_ROLE);
	if (!node_role \|\| strcmp(node_role, "Camera"))
	return;

	that->nodes_.emplace_back(that, id, props);
	that->PipeWireSync();
	}

	// static
	void PipeWireSession::OnRegistryGlobalRemove(void* data, uint32_t id) {
	PipeWireSession* that = static_cast<PipeWireSession*>(data);

	for (auto it = that->nodes_.begin(); it != that->nodes().end(); ++it) {
	if ((*it).id() == id) {
	that->nodes_.erase(it);
	break;
	}
	}
	}

	void PipeWireSession::Finish(VideoCaptureOptions::Status status) {
	webrtc::MutexLock lock(&callback_lock_);

	if (callback_) {
	callback_->OnInitialized(status);
	callback_ = nullptr;
	}
	}

	void PipeWireSession::Cleanup() {
	webrtc::MutexLock lock(&callback_lock_);
	callback_ = nullptr;

	StopPipeWire();
	}

	} // namespace videocapturemodule
	} // namespace webrtc