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platform-external-webrtc/modules/desktop_capture/linux/base_capturer_pipewire.cc
Jan Grulich e52cfab633 PipeWire capturer: request mouse cursor to be part of the stream 
We need to specify that the cursor should be included in the stream as
by default xdg-desktop-portal defaults to hidden cursor.

Bug: chromium:1202526
Change-Id: Ic4742da2e51f7ed28cb9d7b6b0c069c1fa7d0cee
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/214782
Reviewed-by: Tommi <tommi@webrtc.org>
Reviewed-by: Erik Språng <sprang@webrtc.org>
Commit-Queue: Tommi <tommi@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34137}
2021-05-26 19:08:17 +00:00

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/*
* 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 "modules/desktop_capture/linux/base_capturer_pipewire.h"
#include <gio/gunixfdlist.h>
#include <glib-object.h>
#include <spa/param/format-utils.h>
#include <spa/param/props.h>
#if !PW_CHECK_VERSION(0, 3, 0)
#include <spa/param/video/raw-utils.h>
#include <spa/support/type-map.h>
#endif
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/syscall.h>
#include <memory>
#include <utility>
#include "absl/memory/memory.h"
#include "modules/desktop_capture/desktop_capture_options.h"
#include "modules/desktop_capture/desktop_capturer.h"
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
#if defined(WEBRTC_DLOPEN_PIPEWIRE)
#include "modules/desktop_capture/linux/pipewire_stubs.h"
using modules_desktop_capture_linux::InitializeStubs;
#if PW_CHECK_VERSION(0, 3, 0)
using modules_desktop_capture_linux::kModulePipewire03;
#else
using modules_desktop_capture_linux::kModulePipewire02;
#endif
using modules_desktop_capture_linux::StubPathMap;
#endif // defined(WEBRTC_DLOPEN_PIPEWIRE)
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 kBytesPerPixel = 4;
#if defined(WEBRTC_DLOPEN_PIPEWIRE)
#if PW_CHECK_VERSION(0, 3, 0)
const char kPipeWireLib[] = "libpipewire-0.3.so.0";
#else
const char kPipeWireLib[] = "libpipewire-0.2.so.1";
#endif
#endif
// static
struct dma_buf_sync {
uint64_t flags;
};
#define DMA_BUF_SYNC_READ (1 << 0)
#define DMA_BUF_SYNC_START (0 << 2)
#define DMA_BUF_SYNC_END (1 << 2)
#define DMA_BUF_BASE 'b'
#define DMA_BUF_IOCTL_SYNC _IOW(DMA_BUF_BASE, 0, struct dma_buf_sync)
static void SyncDmaBuf(int fd, uint64_t start_or_end) {
struct dma_buf_sync sync = {0};
sync.flags = start_or_end | DMA_BUF_SYNC_READ;
while (true) {
int ret;
ret = ioctl(fd, DMA_BUF_IOCTL_SYNC, &sync);
if (ret == -1 && errno == EINTR) {
continue;
} else if (ret == -1) {
RTC_LOG(LS_ERROR) << "Failed to synchronize DMA buffer: "
<< g_strerror(errno);
break;
} else {
break;
}
}
}
class ScopedBuf {
public:
ScopedBuf() {}
ScopedBuf(unsigned char* map, int map_size, bool is_dma_buf, int fd)
: map_(map), map_size_(map_size), is_dma_buf_(is_dma_buf), fd_(fd) {}
~ScopedBuf() {
if (map_ != MAP_FAILED) {
if (is_dma_buf_) {
SyncDmaBuf(fd_, DMA_BUF_SYNC_END);
}
munmap(map_, map_size_);
}
}
operator bool() { return map_ != MAP_FAILED; }
void initialize(unsigned char* map, int map_size, bool is_dma_buf, int fd) {
map_ = map;
map_size_ = map_size;
is_dma_buf_ = is_dma_buf;
fd_ = fd;
}
unsigned char* get() { return map_; }
protected:
unsigned char* map_ = nullptr;
int map_size_;
bool is_dma_buf_;
int fd_;
};
template <class T>
class Scoped {
public:
Scoped() {}
explicit Scoped(T* val) { ptr_ = val; }
~Scoped() { RTC_NOTREACHED(); }
T* operator->() { return ptr_; }
bool operator!() { return ptr_ == nullptr; }
T* get() { return ptr_; }
T** receive() {
RTC_CHECK(!ptr_);
return &ptr_;
}
Scoped& operator=(T* val) {
ptr_ = val;
return *this;
}
protected:
T* ptr_ = nullptr;
};
template <>
Scoped<GError>::~Scoped() {
if (ptr_) {
g_error_free(ptr_);
}
}
template <>
Scoped<gchar>::~Scoped() {
if (ptr_) {
g_free(ptr_);
}
}
template <>
Scoped<GVariant>::~Scoped() {
if (ptr_) {
g_variant_unref(ptr_);
}
}
template <>
Scoped<GVariantIter>::~Scoped() {
if (ptr_) {
g_variant_iter_free(ptr_);
}
}
template <>
Scoped<GDBusMessage>::~Scoped() {
if (ptr_) {
g_object_unref(ptr_);
}
}
template <>
Scoped<GUnixFDList>::~Scoped() {
if (ptr_) {
g_object_unref(ptr_);
}
}
#if PW_CHECK_VERSION(0, 3, 0)
void BaseCapturerPipeWire::OnCoreError(void* data,
uint32_t id,
int seq,
int res,
const char* message) {
BaseCapturerPipeWire* that = static_cast<BaseCapturerPipeWire*>(data);
RTC_DCHECK(that);
RTC_LOG(LS_ERROR) << "PipeWire remote error: " << message;
}
#else
// 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:
RTC_LOG(LS_ERROR) << "PipeWire remote state error: " << error_message;
break;
case PW_REMOTE_STATE_CONNECTED:
RTC_LOG(LS_INFO) << "PipeWire remote state: connected.";
that->pw_stream_ = that->CreateReceivingStream();
break;
case PW_REMOTE_STATE_CONNECTING:
RTC_LOG(LS_INFO) << "PipeWire remote state: connecting.";
break;
case PW_REMOTE_STATE_UNCONNECTED:
RTC_LOG(LS_INFO) << "PipeWire remote state: unconnected.";
break;
}
}
#endif
// 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);
#if PW_CHECK_VERSION(0, 3, 0)
switch (state) {
case PW_STREAM_STATE_ERROR:
RTC_LOG(LS_ERROR) << "PipeWire stream state error: " << error_message;
break;
case PW_STREAM_STATE_PAUSED:
case PW_STREAM_STATE_STREAMING:
case PW_STREAM_STATE_UNCONNECTED:
case PW_STREAM_STATE_CONNECTING:
break;
}
#else
switch (state) {
case PW_STREAM_STATE_ERROR:
RTC_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;
}
#endif
}
// static
#if PW_CHECK_VERSION(0, 3, 0)
void BaseCapturerPipeWire::OnStreamParamChanged(void* data,
uint32_t id,
const struct spa_pod* format) {
#else
void BaseCapturerPipeWire::OnStreamFormatChanged(void* data,
const struct spa_pod* format) {
#endif
BaseCapturerPipeWire* that = static_cast<BaseCapturerPipeWire*>(data);
RTC_DCHECK(that);
RTC_LOG(LS_INFO) << "PipeWire stream format changed.";
#if PW_CHECK_VERSION(0, 3, 0)
if (!format || id != SPA_PARAM_Format) {
#else
if (!format) {
pw_stream_finish_format(that->pw_stream_, /*res=*/0, /*params=*/nullptr,
/*n_params=*/0);
#endif
return;
}
#if PW_CHECK_VERSION(0, 3, 0)
spa_format_video_raw_parse(format, &that->spa_video_format_);
#else
that->spa_video_format_ = new spa_video_info_raw();
spa_format_video_raw_parse(format, that->spa_video_format_,
&that->pw_type_->format_video);
#endif
#if PW_CHECK_VERSION(0, 3, 0)
auto width = that->spa_video_format_.size.width;
auto height = that->spa_video_format_.size.height;
#else
auto width = that->spa_video_format_->size.width;
auto height = that->spa_video_format_->size.height;
#endif
auto stride = SPA_ROUND_UP_N(width * kBytesPerPixel, 4);
auto size = height * stride;
that->desktop_size_ = DesktopSize(width, height);
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[3];
#if PW_CHECK_VERSION(0, 3, 0)
params[0] = reinterpret_cast<spa_pod*>(spa_pod_builder_add_object(
&builder, SPA_TYPE_OBJECT_ParamBuffers, SPA_PARAM_Buffers,
SPA_PARAM_BUFFERS_size, SPA_POD_Int(size), SPA_PARAM_BUFFERS_stride,
SPA_POD_Int(stride), SPA_PARAM_BUFFERS_buffers,
SPA_POD_CHOICE_RANGE_Int(8, 1, 32)));
params[1] = reinterpret_cast<spa_pod*>(spa_pod_builder_add_object(
&builder, SPA_TYPE_OBJECT_ParamMeta, SPA_PARAM_Meta, SPA_PARAM_META_type,
SPA_POD_Id(SPA_META_Header), SPA_PARAM_META_size,
SPA_POD_Int(sizeof(struct spa_meta_header))));
params[2] = reinterpret_cast<spa_pod*>(spa_pod_builder_add_object(
&builder, SPA_TYPE_OBJECT_ParamMeta, SPA_PARAM_Meta, SPA_PARAM_META_type,
SPA_POD_Id(SPA_META_VideoCrop), SPA_PARAM_META_size,
SPA_POD_Int(sizeof(struct spa_meta_region))));
pw_stream_update_params(that->pw_stream_, params, 3);
#else
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)));
params[2] = 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.VideoCrop,
// Size: size of the metadata, specified as integer (i)
":", that->pw_core_type_->param_meta.size, "i",
sizeof(struct spa_meta_video_crop)));
pw_stream_finish_format(that->pw_stream_, /*res=*/0, params, /*n_params=*/3);
#endif
}
// static
void BaseCapturerPipeWire::OnStreamProcess(void* data) {
BaseCapturerPipeWire* that = static_cast<BaseCapturerPipeWire*>(data);
RTC_DCHECK(that);
struct pw_buffer* next_buffer;
struct pw_buffer* buffer = nullptr;
next_buffer = pw_stream_dequeue_buffer(that->pw_stream_);
while (next_buffer) {
buffer = next_buffer;
next_buffer = pw_stream_dequeue_buffer(that->pw_stream_);
if (next_buffer) {
pw_stream_queue_buffer(that->pw_stream_, buffer);
}
}
if (!buffer) {
return;
}
that->HandleBuffer(buffer);
pw_stream_queue_buffer(that->pw_stream_, buffer);
}
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_CHECK_VERSION(0, 3, 0)
if (pw_type_) {
delete pw_type_;
}
if (spa_video_format_) {
delete spa_video_format_;
}
#endif
if (pw_stream_) {
pw_stream_destroy(pw_stream_);
}
#if !PW_CHECK_VERSION(0, 3, 0)
if (pw_remote_) {
pw_remote_destroy(pw_remote_);
}
#endif
#if PW_CHECK_VERSION(0, 3, 0)
if (pw_core_) {
pw_core_disconnect(pw_core_);
}
if (pw_context_) {
pw_context_destroy(pw_context_);
}
#else
if (pw_core_) {
pw_core_destroy(pw_core_);
}
#endif
if (pw_main_loop_) {
pw_thread_loop_destroy(pw_main_loop_);
}
#if !PW_CHECK_VERSION(0, 3, 0)
if (pw_loop_) {
pw_loop_destroy(pw_loop_);
}
#endif
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_) {
Scoped<GDBusMessage> message(g_dbus_message_new_method_call(
kDesktopBusName, session_handle_, kSessionInterfaceName, "Close"));
if (message.get()) {
Scoped<GError> error;
g_dbus_connection_send_message(connection_, message.get(),
G_DBUS_SEND_MESSAGE_FLAGS_NONE,
/*out_serial=*/nullptr, error.receive());
if (error.get()) {
RTC_LOG(LS_ERROR) << "Failed to close the session: " << error->message;
}
}
}
g_free(start_handle_);
g_free(sources_handle_);
g_free(session_handle_);
g_free(portal_handle_);
if (cancellable_) {
g_cancellable_cancel(cancellable_);
g_object_unref(cancellable_);
cancellable_ = nullptr;
}
if (proxy_) {
g_object_unref(proxy_);
proxy_ = nullptr;
}
}
void BaseCapturerPipeWire::InitPortal() {
cancellable_ = g_cancellable_new();
g_dbus_proxy_new_for_bus(
G_BUS_TYPE_SESSION, G_DBUS_PROXY_FLAGS_NONE, /*info=*/nullptr,
kDesktopBusName, kDesktopObjectPath, kScreenCastInterfaceName,
cancellable_,
reinterpret_cast<GAsyncReadyCallback>(OnProxyRequested), this);
}
void BaseCapturerPipeWire::InitPipeWire() {
#if defined(WEBRTC_DLOPEN_PIPEWIRE)
StubPathMap paths;
// Check if the PipeWire library is available.
#if PW_CHECK_VERSION(0, 3, 0)
paths[kModulePipewire03].push_back(kPipeWireLib);
#else
paths[kModulePipewire02].push_back(kPipeWireLib);
#endif
if (!InitializeStubs(paths)) {
RTC_LOG(LS_ERROR) << "Failed to load the PipeWire library and symbols.";
portal_init_failed_ = true;
return;
}
#endif // defined(WEBRTC_DLOPEN_PIPEWIRE)
pw_init(/*argc=*/nullptr, /*argc=*/nullptr);
#if PW_CHECK_VERSION(0, 3, 0)
pw_main_loop_ = pw_thread_loop_new("pipewire-main-loop", nullptr);
pw_thread_loop_lock(pw_main_loop_);
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;
}
pw_core_ = pw_context_connect(pw_context_, nullptr, 0);
if (!pw_core_) {
RTC_LOG(LS_ERROR) << "Failed to connect PipeWire context";
return;
}
#else
pw_loop_ = pw_loop_new(/*properties=*/nullptr);
pw_main_loop_ = pw_thread_loop_new(pw_loop_, "pipewire-main-loop");
pw_thread_loop_lock(pw_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();
#endif
// Initialize event handlers, remote end and stream-related.
#if PW_CHECK_VERSION(0, 3, 0)
pw_core_events_.version = PW_VERSION_CORE_EVENTS;
pw_core_events_.error = &OnCoreError;
pw_stream_events_.version = PW_VERSION_STREAM_EVENTS;
pw_stream_events_.state_changed = &OnStreamStateChanged;
pw_stream_events_.param_changed = &OnStreamParamChanged;
pw_stream_events_.process = &OnStreamProcess;
#else
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;
#endif
#if PW_CHECK_VERSION(0, 3, 0)
pw_core_add_listener(pw_core_, &spa_core_listener_, &pw_core_events_, this);
pw_stream_ = CreateReceivingStream();
if (!pw_stream_) {
RTC_LOG(LS_ERROR) << "Failed to create PipeWire stream";
return;
}
#else
pw_remote_add_listener(pw_remote_, &spa_remote_listener_, &pw_remote_events_,
this);
pw_remote_connect_fd(pw_remote_, pw_fd_);
#endif
if (pw_thread_loop_start(pw_main_loop_) < 0) {
RTC_LOG(LS_ERROR) << "Failed to start main PipeWire loop";
portal_init_failed_ = true;
}
pw_thread_loop_unlock(pw_main_loop_);
RTC_LOG(LS_INFO) << "PipeWire remote opened.";
}
#if !PW_CHECK_VERSION(0, 3, 0)
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);
}
#endif
pw_stream* BaseCapturerPipeWire::CreateReceivingStream() {
#if !PW_CHECK_VERSION(0, 3, 0)
if (pw_remote_get_state(pw_remote_, nullptr) != PW_REMOTE_STATE_CONNECTED) {
RTC_LOG(LS_ERROR) << "Cannot create pipewire stream";
return nullptr;
}
#endif
spa_rectangle pwMinScreenBounds = spa_rectangle{1, 1};
spa_rectangle pwMaxScreenBounds = spa_rectangle{UINT32_MAX, UINT32_MAX};
pw_properties* reuseProps =
pw_properties_new_string("pipewire.client.reuse=1");
#if PW_CHECK_VERSION(0, 3, 0)
auto stream = pw_stream_new(pw_core_, "webrtc-consume-stream", reuseProps);
#else
auto stream = pw_stream_new(pw_remote_, "webrtc-consume-stream", reuseProps);
#endif
uint8_t buffer[1024] = {};
const spa_pod* params[1];
spa_pod_builder builder = spa_pod_builder{buffer, sizeof(buffer)};
#if PW_CHECK_VERSION(0, 3, 0)
params[0] = reinterpret_cast<spa_pod*>(spa_pod_builder_add_object(
&builder, SPA_TYPE_OBJECT_Format, SPA_PARAM_EnumFormat,
SPA_FORMAT_mediaType, SPA_POD_Id(SPA_MEDIA_TYPE_video),
SPA_FORMAT_mediaSubtype, SPA_POD_Id(SPA_MEDIA_SUBTYPE_raw),
SPA_FORMAT_VIDEO_format,
SPA_POD_CHOICE_ENUM_Id(5, SPA_VIDEO_FORMAT_BGRx, SPA_VIDEO_FORMAT_RGBx,
SPA_VIDEO_FORMAT_RGBA, SPA_VIDEO_FORMAT_BGRx,
SPA_VIDEO_FORMAT_BGRA),
SPA_FORMAT_VIDEO_size,
SPA_POD_CHOICE_RANGE_Rectangle(&pwMinScreenBounds, &pwMinScreenBounds,
&pwMaxScreenBounds),
0));
#else
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(
4, pw_type_->video_format.RGBx, pw_type_->video_format.BGRx,
pw_type_->video_format.RGBA, pw_type_->video_format.BGRA),
// 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", &pwMinScreenBounds,
SPA_POD_PROP_MIN_MAX(&pwMinScreenBounds, &pwMaxScreenBounds)));
#endif
pw_stream_add_listener(stream, &spa_stream_listener_, &pw_stream_events_,
this);
#if PW_CHECK_VERSION(0, 3, 0)
if (pw_stream_connect(stream, PW_DIRECTION_INPUT, pw_stream_node_id_,
PW_STREAM_FLAG_AUTOCONNECT, params, 1) != 0) {
#else
pw_stream_flags flags = static_cast<pw_stream_flags>(
PW_STREAM_FLAG_AUTOCONNECT | PW_STREAM_FLAG_INACTIVE);
if (pw_stream_connect(stream, PW_DIRECTION_INPUT, /*port_path=*/nullptr,
flags, params,
/*n_params=*/1) != 0) {
#endif
RTC_LOG(LS_ERROR) << "Could not connect receiving stream.";
portal_init_failed_ = true;
return nullptr;
}
return stream;
}
void BaseCapturerPipeWire::HandleBuffer(pw_buffer* buffer) {
spa_buffer* spaBuffer = buffer->buffer;
ScopedBuf map;
uint8_t* src = nullptr;
if (spaBuffer->datas[0].chunk->size == 0) {
RTC_LOG(LS_ERROR) << "Failed to get video stream: Zero size.";
return;
}
#if PW_CHECK_VERSION(0, 3, 0)
if (spaBuffer->datas[0].type == SPA_DATA_MemFd ||
spaBuffer->datas[0].type == SPA_DATA_DmaBuf) {
#else
if (spaBuffer->datas[0].type == pw_core_type_->data.MemFd ||
spaBuffer->datas[0].type == pw_core_type_->data.DmaBuf) {
#endif
map.initialize(
static_cast<uint8_t*>(
mmap(nullptr,
spaBuffer->datas[0].maxsize + spaBuffer->datas[0].mapoffset,
PROT_READ, MAP_PRIVATE, spaBuffer->datas[0].fd, 0)),
spaBuffer->datas[0].maxsize + spaBuffer->datas[0].mapoffset,
#if PW_CHECK_VERSION(0, 3, 0)
spaBuffer->datas[0].type == SPA_DATA_DmaBuf,
#else
spaBuffer->datas[0].type == pw_core_type_->data.DmaBuf,
#endif
spaBuffer->datas[0].fd);
if (!map) {
RTC_LOG(LS_ERROR) << "Failed to mmap the memory: "
<< std::strerror(errno);
return;
}
#if PW_CHECK_VERSION(0, 3, 0)
if (spaBuffer->datas[0].type == SPA_DATA_DmaBuf) {
#else
if (spaBuffer->datas[0].type == pw_core_type_->data.DmaBuf) {
#endif
SyncDmaBuf(spaBuffer->datas[0].fd, DMA_BUF_SYNC_START);
}
src = SPA_MEMBER(map.get(), spaBuffer->datas[0].mapoffset, uint8_t);
#if PW_CHECK_VERSION(0, 3, 0)
} else if (spaBuffer->datas[0].type == SPA_DATA_MemPtr) {
#else
} else if (spaBuffer->datas[0].type == pw_core_type_->data.MemPtr) {
#endif
src = static_cast<uint8_t*>(spaBuffer->datas[0].data);
}
if (!src) {
return;
}
#if PW_CHECK_VERSION(0, 3, 0)
struct spa_meta_region* video_metadata =
static_cast<struct spa_meta_region*>(spa_buffer_find_meta_data(
spaBuffer, SPA_META_VideoCrop, sizeof(*video_metadata)));
#else
struct spa_meta_video_crop* video_metadata =
static_cast<struct spa_meta_video_crop*>(
spa_buffer_find_meta(spaBuffer, pw_core_type_->meta.VideoCrop));
#endif
// Video size from metadata is bigger than an actual video stream size.
// The metadata are wrong or we should up-scale the video...in both cases
// just quit now.
#if PW_CHECK_VERSION(0, 3, 0)
if (video_metadata && (video_metadata->region.size.width >
static_cast<uint32_t>(desktop_size_.width()) ||
video_metadata->region.size.height >
static_cast<uint32_t>(desktop_size_.height()))) {
#else
if (video_metadata && (video_metadata->width > desktop_size_.width() ||
video_metadata->height > desktop_size_.height())) {
#endif
RTC_LOG(LS_ERROR) << "Stream metadata sizes are wrong!";
return;
}
// Use video metadata when video size from metadata is set and smaller than
// video stream size, so we need to adjust it.
bool video_metadata_use = false;
#if PW_CHECK_VERSION(0, 3, 0)
const struct spa_rectangle* video_metadata_size =
video_metadata ? &video_metadata->region.size : nullptr;
#else
const struct spa_meta_video_crop* video_metadata_size = video_metadata;
#endif
if (video_metadata_size && video_metadata_size->width != 0 &&
video_metadata_size->height != 0 &&
(static_cast<int>(video_metadata_size->width) < desktop_size_.width() ||
static_cast<int>(video_metadata_size->height) <
desktop_size_.height())) {
video_metadata_use = true;
}
DesktopSize video_size_prev = video_size_;
if (video_metadata_use) {
video_size_ =
DesktopSize(video_metadata_size->width, video_metadata_size->height);
} else {
video_size_ = desktop_size_;
}
webrtc::MutexLock lock(&current_frame_lock_);
if (!current_frame_ || !video_size_.equals(video_size_prev)) {
current_frame_ = std::make_unique<uint8_t[]>(
video_size_.width() * video_size_.height() * kBytesPerPixel);
}
const int32_t dst_stride = video_size_.width() * kBytesPerPixel;
const int32_t src_stride = spaBuffer->datas[0].chunk->stride;
if (src_stride != (desktop_size_.width() * kBytesPerPixel)) {
RTC_LOG(LS_ERROR) << "Got buffer with stride different from screen stride: "
<< src_stride
<< " != " << (desktop_size_.width() * kBytesPerPixel);
portal_init_failed_ = true;
return;
}
// Adjust source content based on metadata video position
#if PW_CHECK_VERSION(0, 3, 0)
if (video_metadata_use &&
(video_metadata->region.position.y + video_size_.height() <=
desktop_size_.height())) {
src += src_stride * video_metadata->region.position.y;
}
const int x_offset =
video_metadata_use &&
(video_metadata->region.position.x + video_size_.width() <=
desktop_size_.width())
? video_metadata->region.position.x * kBytesPerPixel
: 0;
#else
if (video_metadata_use &&
(video_metadata->y + video_size_.height() <= desktop_size_.height())) {
src += src_stride * video_metadata->y;
}
const int x_offset =
video_metadata_use &&
(video_metadata->x + video_size_.width() <= desktop_size_.width())
? video_metadata->x * kBytesPerPixel
: 0;
#endif
uint8_t* dst = current_frame_.get();
for (int i = 0; i < video_size_.height(); ++i) {
// Adjust source content based on crop video position if needed
src += x_offset;
std::memcpy(dst, src, dst_stride);
// 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 PW_CHECK_VERSION(0, 3, 0)
if (spa_video_format_.format == SPA_VIDEO_FORMAT_RGBx ||
spa_video_format_.format == SPA_VIDEO_FORMAT_RGBA) {
#else
if (spa_video_format_->format == pw_type_->video_format.RGBx ||
spa_video_format_->format == pw_type_->video_format.RGBA) {
#endif
ConvertRGBxToBGRx(dst, dst_stride);
}
src += src_stride - x_offset;
dst += dst_stride;
}
}
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);
Scoped<GError> error;
GDBusProxy* proxy = g_dbus_proxy_new_finish(result, error.receive());
if (!proxy) {
if (g_error_matches(error.get(), G_IO_ERROR, G_IO_ERROR_CANCELLED))
return;
RTC_LOG(LS_ERROR) << "Failed to create a proxy for the screen cast portal: "
<< error->message;
that->portal_init_failed_ = true;
return;
}
that->proxy_ = proxy;
that->connection_ = g_dbus_proxy_get_connection(that->proxy_);
RTC_LOG(LS_INFO) << "Created proxy for the screen cast portal.";
that->SessionRequest();
}
// static
gchar* BaseCapturerPipeWire::PrepareSignalHandle(GDBusConnection* connection,
const gchar* token) {
Scoped<gchar> sender(
g_strdup(g_dbus_connection_get_unique_name(connection) + 1));
for (int i = 0; sender.get()[i]; i++) {
if (sender.get()[i] == '.') {
sender.get()[i] = '_';
}
}
gchar* handle = g_strconcat(kDesktopRequestObjectPath, "/", sender.get(), "/",
token, /*end of varargs*/ nullptr);
return handle;
}
void BaseCapturerPipeWire::SessionRequest() {
GVariantBuilder builder;
Scoped<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.get()));
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.get()));
portal_handle_ = PrepareSignalHandle(connection_, variant_string.get());
session_request_signal_id_ = SetupRequestResponseSignal(
portal_handle_, OnSessionRequestResponseSignal);
RTC_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_,
reinterpret_cast<GAsyncReadyCallback>(OnSessionRequested), this);
}
// static
void BaseCapturerPipeWire::OnSessionRequested(GDBusProxy *proxy,
GAsyncResult* result,
gpointer user_data) {
BaseCapturerPipeWire* that = static_cast<BaseCapturerPipeWire*>(user_data);
RTC_DCHECK(that);
Scoped<GError> error;
Scoped<GVariant> variant(
g_dbus_proxy_call_finish(proxy, result, error.receive()));
if (!variant) {
if (g_error_matches(error.get(), G_IO_ERROR, G_IO_ERROR_CANCELLED))
return;
RTC_LOG(LS_ERROR) << "Failed to create a screen cast session: "
<< error->message;
that->portal_init_failed_ = true;
return;
}
RTC_LOG(LS_INFO) << "Initializing the screen cast session.";
Scoped<gchar> handle;
g_variant_get_child(variant.get(), 0, "o", &handle);
if (!handle) {
RTC_LOG(LS_ERROR) << "Failed to initialize the screen cast session.";
if (that->session_request_signal_id_) {
g_dbus_connection_signal_unsubscribe(that->connection_,
that->session_request_signal_id_);
that->session_request_signal_id_ = 0;
}
that->portal_init_failed_ = true;
return;
}
RTC_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);
RTC_LOG(LS_INFO)
<< "Received response for the screen cast session subscription.";
guint32 portal_response;
Scoped<GVariant> response_data;
g_variant_get(parameters, "(u@a{sv})", &portal_response,
response_data.receive());
g_variant_lookup(response_data.get(), "session_handle", "s",
&that->session_handle_);
if (!that->session_handle_ || portal_response) {
RTC_LOG(LS_ERROR)
<< "Failed to request the screen cast session subscription.";
that->portal_init_failed_ = true;
return;
}
that->SourcesRequest();
}
void BaseCapturerPipeWire::SourcesRequest() {
GVariantBuilder builder;
Scoped<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(static_cast<uint32_t>(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));
Scoped<GVariant> variant(
g_dbus_proxy_get_cached_property(proxy_, "AvailableCursorModes"));
if (variant.get()) {
uint32_t modes = 0;
g_variant_get(variant.get(), "u", &modes);
// Request mouse cursor to be embedded as part of the stream, otherwise it
// is hidden by default. Make request only if this mode is advertised by
// the portal implementation.
if (modes &
static_cast<uint32_t>(BaseCapturerPipeWire::CursorMode::kEmbedded)) {
g_variant_builder_add(&builder, "{sv}", "cursor_mode",
g_variant_new_uint32(static_cast<uint32_t>(
BaseCapturerPipeWire::CursorMode::kEmbedded)));
}
}
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.get()));
sources_handle_ = PrepareSignalHandle(connection_, variant_string.get());
sources_request_signal_id_ = SetupRequestResponseSignal(
sources_handle_, OnSourcesRequestResponseSignal);
RTC_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_,
reinterpret_cast<GAsyncReadyCallback>(OnSourcesRequested), this);
}
// static
void BaseCapturerPipeWire::OnSourcesRequested(GDBusProxy *proxy,
GAsyncResult* result,
gpointer user_data) {
BaseCapturerPipeWire* that = static_cast<BaseCapturerPipeWire*>(user_data);
RTC_DCHECK(that);
Scoped<GError> error;
Scoped<GVariant> variant(
g_dbus_proxy_call_finish(proxy, result, error.receive()));
if (!variant) {
if (g_error_matches(error.get(), G_IO_ERROR, G_IO_ERROR_CANCELLED))
return;
RTC_LOG(LS_ERROR) << "Failed to request the sources: " << error->message;
that->portal_init_failed_ = true;
return;
}
RTC_LOG(LS_INFO) << "Sources requested from the screen cast session.";
Scoped<gchar> handle;
g_variant_get_child(variant.get(), 0, "o", handle.receive());
if (!handle) {
RTC_LOG(LS_ERROR) << "Failed to initialize the screen cast session.";
if (that->sources_request_signal_id_) {
g_dbus_connection_signal_unsubscribe(that->connection_,
that->sources_request_signal_id_);
that->sources_request_signal_id_ = 0;
}
that->portal_init_failed_ = true;
return;
}
RTC_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);
RTC_LOG(LS_INFO) << "Received sources signal from session.";
guint32 portal_response;
g_variant_get(parameters, "(u@a{sv})", &portal_response, nullptr);
if (portal_response) {
RTC_LOG(LS_ERROR)
<< "Failed to select sources for the screen cast session.";
that->portal_init_failed_ = true;
return;
}
that->StartRequest();
}
void BaseCapturerPipeWire::StartRequest() {
GVariantBuilder builder;
Scoped<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.get()));
start_handle_ = PrepareSignalHandle(connection_, variant_string.get());
start_request_signal_id_ =
SetupRequestResponseSignal(start_handle_, OnStartRequestResponseSignal);
// "Identifier for the application window", this is Wayland, so not "x11:...".
const gchar parent_window[] = "";
RTC_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_,
reinterpret_cast<GAsyncReadyCallback>(OnStartRequested), this);
}
// static
void BaseCapturerPipeWire::OnStartRequested(GDBusProxy *proxy,
GAsyncResult* result,
gpointer user_data) {
BaseCapturerPipeWire* that = static_cast<BaseCapturerPipeWire*>(user_data);
RTC_DCHECK(that);
Scoped<GError> error;
Scoped<GVariant> variant(
g_dbus_proxy_call_finish(proxy, result, error.receive()));
if (!variant) {
if (g_error_matches(error.get(), G_IO_ERROR, G_IO_ERROR_CANCELLED))
return;
RTC_LOG(LS_ERROR) << "Failed to start the screen cast session: "
<< error->message;
that->portal_init_failed_ = true;
return;
}
RTC_LOG(LS_INFO) << "Initializing the start of the screen cast session.";
Scoped<gchar> handle;
g_variant_get_child(variant.get(), 0, "o", handle.receive());
if (!handle) {
RTC_LOG(LS_ERROR)
<< "Failed to initialize the start of the screen cast session.";
if (that->start_request_signal_id_) {
g_dbus_connection_signal_unsubscribe(that->connection_,
that->start_request_signal_id_);
that->start_request_signal_id_ = 0;
}
that->portal_init_failed_ = true;
return;
}
RTC_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);
RTC_LOG(LS_INFO) << "Start signal received.";
guint32 portal_response;
Scoped<GVariant> response_data;
Scoped<GVariantIter> iter;
g_variant_get(parameters, "(u@a{sv})", &portal_response,
response_data.receive());
if (portal_response || !response_data) {
RTC_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.get(), "streams", "a(ua{sv})",
iter.receive())) {
Scoped<GVariant> variant;
while (g_variant_iter_next(iter.get(), "@(ua{sv})", variant.receive())) {
guint32 stream_id;
guint32 type;
Scoped<GVariant> options;
g_variant_get(variant.get(), "(u@a{sv})", &stream_id, options.receive());
RTC_DCHECK(options.get());
if (g_variant_lookup(options.get(), "source_type", "u", &type)) {
that->capture_source_type_ =
static_cast<BaseCapturerPipeWire::CaptureSourceType>(type);
}
that->pw_stream_node_id_ = stream_id;
break;
}
}
that->OpenPipeWireRemote();
}
void BaseCapturerPipeWire::OpenPipeWireRemote() {
GVariantBuilder builder;
g_variant_builder_init(&builder, G_VARIANT_TYPE_VARDICT);
RTC_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_,
reinterpret_cast<GAsyncReadyCallback>(OnOpenPipeWireRemoteRequested),
this);
}
// static
void BaseCapturerPipeWire::OnOpenPipeWireRemoteRequested(
GDBusProxy *proxy,
GAsyncResult* result,
gpointer user_data) {
BaseCapturerPipeWire* that = static_cast<BaseCapturerPipeWire*>(user_data);
RTC_DCHECK(that);
Scoped<GError> error;
Scoped<GUnixFDList> outlist;
Scoped<GVariant> variant(g_dbus_proxy_call_with_unix_fd_list_finish(
proxy, outlist.receive(), result, error.receive()));
if (!variant) {
if (g_error_matches(error.get(), G_IO_ERROR, G_IO_ERROR_CANCELLED))
return;
RTC_LOG(LS_ERROR) << "Failed to open the PipeWire remote: "
<< error->message;
that->portal_init_failed_ = true;
return;
}
gint32 index;
g_variant_get(variant.get(), "(h)", &index);
if ((that->pw_fd_ =
g_unix_fd_list_get(outlist.get(), index, error.receive())) == -1) {
RTC_LOG(LS_ERROR) << "Failed to get file descriptor from the list: "
<< error->message;
that->portal_init_failed_ = true;
return;
}
that->InitPipeWire();
}
void BaseCapturerPipeWire::Start(Callback* callback) {
RTC_DCHECK(!callback_);
RTC_DCHECK(callback);
InitPortal();
callback_ = callback;
}
void BaseCapturerPipeWire::CaptureFrame() {
if (portal_init_failed_) {
callback_->OnCaptureResult(Result::ERROR_PERMANENT, nullptr);
return;
}
webrtc::MutexLock lock(&current_frame_lock_);
if (!current_frame_) {
callback_->OnCaptureResult(Result::ERROR_TEMPORARY, nullptr);
return;
}
DesktopSize frame_size = video_size_;
std::unique_ptr<DesktopFrame> result(new BasicDesktopFrame(frame_size));
result->CopyPixelsFrom(
current_frame_.get(), (frame_size.width() * kBytesPerPixel),
DesktopRect::MakeWH(frame_size.width(), frame_size.height()));
if (!result) {
callback_->OnCaptureResult(Result::ERROR_TEMPORARY, nullptr);
return;
}
// TODO(julien.isorce): http://crbug.com/945468. Set the icc profile on the
// frame, see ScreenCapturerX11::CaptureFrame.
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;
}
// static
std::unique_ptr<DesktopCapturer> BaseCapturerPipeWire::CreateRawCapturer(
const DesktopCaptureOptions& options) {
return std::make_unique<BaseCapturerPipeWire>(
BaseCapturerPipeWire::CaptureSourceType::kAny);
}
} // namespace webrtc
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