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android13/external/webrtc/modules/desktop_capture/linux/base_capturer_pipewire.cc

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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>
#include <spa/param/video/raw-utils.h>
#include <spa/support/type-map.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;
using modules_desktop_capture_linux::kModulePipewire;
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)
const char kPipeWireLib[] = "libpipewire-0.2.so.1";
#endif
// 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->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;
}
}
// 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:
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;
}
}
// static
void BaseCapturerPipeWire::OnStreamFormatChanged(void* data,
const struct spa_pod* format) {
BaseCapturerPipeWire* that = static_cast<BaseCapturerPipeWire*>(data);
RTC_DCHECK(that);
RTC_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 * kBytesPerPixel, 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) {
RTC_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 (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.
paths[kModulePipewire].push_back(kPipeWireLib);
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);
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) {
RTC_LOG(LS_ERROR) << "Failed to start main PipeWire loop";
portal_init_failed_ = true;
}
RTC_LOG(LS_INFO) << "PipeWire remote opened.";
}
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_string("pipewire.client.reuse=1");
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) {
RTC_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() * kBytesPerPixel)) {
RTC_LOG(LS_ERROR) << "Got buffer with stride different from screen stride: "
<< srcStride
<< " != " << (desktop_size_.width() * kBytesPerPixel);
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;
GDBusProxy *proxy = g_dbus_proxy_new_finish(result, &error);
if (!proxy) {
if (g_error_matches(error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
return;
RTC_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->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) {
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);
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);
GError* error = nullptr;
GVariant* variant = g_dbus_proxy_call_finish(proxy, result, &error);
if (!variant) {
if (g_error_matches(error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
return;
RTC_LOG(LS_ERROR) << "Failed to create a screen cast session: "
<< error->message;
g_error_free(error);
that->portal_init_failed_ = true;
return;
}
RTC_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) {
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;
}
g_free(handle);
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;
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) {
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;
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);
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);
GError* error = nullptr;
GVariant* variant = g_dbus_proxy_call_finish(proxy, result, &error);
if (!variant) {
if (g_error_matches(error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
return;
RTC_LOG(LS_ERROR) << "Failed to request the sources: " << error->message;
g_error_free(error);
that->portal_init_failed_ = true;
return;
}
RTC_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) {
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;
}
g_free(handle);
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;
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[] = "";
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);
GError* error = nullptr;
GVariant* variant = g_dbus_proxy_call_finish(proxy, result, &error);
if (!variant) {
if (g_error_matches(error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
return;
RTC_LOG(LS_ERROR) << "Failed to start the screen cast session: "
<< error->message;
g_error_free(error);
that->portal_init_failed_ = true;
return;
}
RTC_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) {
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;
}
g_free(handle);
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;
GVariant* response_data;
GVariantIter* iter = nullptr;
g_variant_get(parameters, "(u@a{sv})", &portal_response, &response_data);
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, "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);
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);
GError* error = nullptr;
GUnixFDList* outlist = nullptr;
GVariant* variant = g_dbus_proxy_call_with_unix_fd_list_finish(
proxy, &outlist, result, &error);
if (!variant) {
if (g_error_matches(error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
return;
RTC_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) {
RTC_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();
}
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;
}
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() * kBytesPerPixel),
DesktopRect::MakeWH(desktop_size_.width(), desktop_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;
}
} // namespace webrtc
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