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/*
* 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 "modules/video_capture/linux/device_info_pipewire.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 <algorithm>
#include "common_video/libyuv/include/webrtc_libyuv.h"
#include "modules/video_capture/device_info_impl.h"
#include "rtc_base/logging.h"
#include "rtc_base/sanitizer.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_RGB16:
return VideoType::kRGB565;
case SPA_VIDEO_FORMAT_RGB:
return VideoType::kBGR24;
case SPA_VIDEO_FORMAT_BGR:
return VideoType::kRGB24;
case SPA_VIDEO_FORMAT_BGRA:
return VideoType::kARGB;
case SPA_VIDEO_FORMAT_RGBA:
return VideoType::kABGR;
case SPA_VIDEO_FORMAT_ARGB:
return VideoType::kBGRA;
default:
return VideoType::kUnknown;
}
}
void PipeWireNode::PipeWireNodeDeleter::operator()(
PipeWireNode* node) const noexcept {
pw_proxy_destroy(node->proxy_);
spa_hook_remove(&node->node_listener_);
}
// static
PipeWireNode::PipeWireNodePtr PipeWireNode::Create(PipeWireSession* session,
uint32_t id,
const spa_dict* props) {
return PipeWireNodePtr(new PipeWireNode(session, id, props));
}
RTC_NO_SANITIZE("cfi-icall")
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_(spa_dict_lookup(props, PW_KEY_NODE_NAME)) {
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);
}
// static
RTC_NO_SANITIZE("cfi-icall")
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;
std::optional<int> vid;
std::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) : std::nullopt;
pid = pid_str ? rtc::StringToNumber<int>(pid_str) : std::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;
}
}
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
RTC_NO_SANITIZE("cfi-icall")
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_Enum) {
for (uint32_t i = 1; i < n_items; i++) {
cap.maxFPS = std::max(
static_cast<int32_t>(1.0 * fract[i].num / fract[i].denom),
cap.maxFPS);
}
} 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::RegisterDeviceInfo(DeviceInfoPipeWire* device_info) {
RTC_CHECK(device_info);
MutexLock lock(&device_info_lock_);
auto it = std::find(device_info_list_.begin(), device_info_list_.end(), device_info);
if (it == device_info_list_.end()) {
device_info_list_.push_back(device_info);
return true;
}
return false;
}
bool PipeWireSession::DeRegisterDeviceInfo(DeviceInfoPipeWire* device_info) {
RTC_CHECK(device_info);
MutexLock lock(&device_info_lock_);
auto it = std::find(device_info_list_.begin(), device_info_list_.end(), device_info);
if (it != device_info_list_.end()) {
device_info_list_.erase(it);
return true;
}
return false;
}
RTC_NO_SANITIZE("cfi-icall")
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_, ®istry_listener_, ®istry_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;
}
}
RTC_NO_SANITIZE("cfi-icall")
void PipeWireSession::PipeWireSync() {
sync_seq_ = pw_core_sync(pw_core_, PW_ID_CORE, sync_seq_);
}
void PipeWireSession::NotifyDeviceChange() {
RTC_LOG(LS_INFO) << "Notify about device list changes";
MutexLock lock(&device_info_lock_);
// It makes sense to notify about device changes only once we are
// properly initialized.
if (status_ != VideoCaptureOptions::Status::SUCCESS) {
return;
}
for (auto* deviceInfo : device_info_list_) {
deviceInfo->DeviceChange();
}
}
// 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.";
// Remove camera devices with no capabilities
auto it = std::remove_if(that->nodes_.begin(), that->nodes_.end(),
[](const PipeWireNode::PipeWireNodePtr& node) {
return node->capabilities().empty();
});
that->nodes_.erase(it, that->nodes_.end());
that->Finish(VideoCaptureOptions::Status::SUCCESS);
}
}
}
// static
RTC_NO_SANITIZE("cfi-icall")
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);
// Skip already added nodes to avoid duplicate camera entries
if (std::find_if(that->nodes_.begin(), that->nodes_.end(),
[id](const PipeWireNode::PipeWireNodePtr& node) {
return node->id() == id;
}) != that->nodes_.end())
return;
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_.push_back(PipeWireNode::Create(that, id, props));
that->PipeWireSync();
that->NotifyDeviceChange();
}
// static
void PipeWireSession::OnRegistryGlobalRemove(void* data, uint32_t id) {
PipeWireSession* that = static_cast<PipeWireSession*>(data);
auto it = std::remove_if(that->nodes_.begin(), that->nodes_.end(),
[id](const PipeWireNode::PipeWireNodePtr& node) {
return node->id() == id;
});
that->nodes_.erase(it, that->nodes_.end());
that->NotifyDeviceChange();
}
void PipeWireSession::Finish(VideoCaptureOptions::Status status) {
{
MutexLock lock(&device_info_lock_);
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