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mutter-performance-source/src/backends/meta-screen-cast.c
Jonas Ådahl 986066ed40 screen-cast: Disable DMA buffer based screen casting for QXL 
QXL doesn't support mmap():ing a DMA buffer allocated in mutter inside
the PipeWire stream consumer process. To make screen casting work again
on QXL, disable DMA buffer based screen casting for QXL.

Eventually, it should be the client that renegotiates the supported
buffer types, but until then we need this list.

https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1318
2020-08-29 10:32:20 +00:00

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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/*
* Copyright (C) 2015-2017 Red Hat Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*
*/
#include "config.h"
#include "backends/meta-screen-cast.h"
#include <pipewire/pipewire.h>
#include "backends/meta-backend-private.h"
#include "backends/meta-remote-desktop-session.h"
#include "backends/meta-screen-cast-session.h"
#define META_SCREEN_CAST_DBUS_SERVICE "org.gnome.Mutter.ScreenCast"
#define META_SCREEN_CAST_DBUS_PATH "/org/gnome/Mutter/ScreenCast"
#define META_SCREEN_CAST_API_VERSION 4
struct _MetaScreenCast
{
MetaDBusScreenCastSkeleton parent;
int dbus_name_id;
int inhibit_count;
GList *sessions;
MetaDbusSessionWatcher *session_watcher;
MetaBackend *backend;
gboolean disable_dma_bufs;
};
static void
meta_screen_cast_init_iface (MetaDBusScreenCastIface *iface);
G_DEFINE_TYPE_WITH_CODE (MetaScreenCast, meta_screen_cast,
META_DBUS_TYPE_SCREEN_CAST_SKELETON,
G_IMPLEMENT_INTERFACE (META_DBUS_TYPE_SCREEN_CAST,
meta_screen_cast_init_iface))
void
meta_screen_cast_inhibit (MetaScreenCast *screen_cast)
{
screen_cast->inhibit_count++;
if (screen_cast->inhibit_count == 1)
{
while (screen_cast->sessions)
{
MetaScreenCastSession *session = screen_cast->sessions->data;
meta_screen_cast_session_close (session);
}
}
}
void
meta_screen_cast_uninhibit (MetaScreenCast *screen_cast)
{
g_return_if_fail (screen_cast->inhibit_count > 0);
screen_cast->inhibit_count--;
}
GDBusConnection *
meta_screen_cast_get_connection (MetaScreenCast *screen_cast)
{
GDBusInterfaceSkeleton *interface_skeleton =
G_DBUS_INTERFACE_SKELETON (screen_cast);
return g_dbus_interface_skeleton_get_connection (interface_skeleton);
}
MetaBackend *
meta_screen_cast_get_backend (MetaScreenCast *screen_cast)
{
return screen_cast->backend;
}
void
meta_screen_cast_disable_dma_bufs (MetaScreenCast *screen_cast)
{
screen_cast->disable_dma_bufs = TRUE;
}
CoglDmaBufHandle *
meta_screen_cast_create_dma_buf_handle (MetaScreenCast *screen_cast,
int width,
int height)
{
ClutterBackend *clutter_backend =
meta_backend_get_clutter_backend (screen_cast->backend);
CoglContext *cogl_context =
clutter_backend_get_cogl_context (clutter_backend);
CoglRenderer *cogl_renderer = cogl_context_get_renderer (cogl_context);
g_autoptr (GError) error = NULL;
CoglDmaBufHandle *dmabuf_handle;
if (screen_cast->disable_dma_bufs)
return NULL;
dmabuf_handle = cogl_renderer_create_dma_buf (cogl_renderer,
width, height,
&error);
if (!dmabuf_handle)
{
g_warning ("Failed to allocate DMA buffer, "
"disabling DMA buffer based screen casting: %s",
error->message);
screen_cast->disable_dma_bufs = TRUE;
return NULL;
}
return dmabuf_handle;
}
static gboolean
register_remote_desktop_screen_cast_session (MetaScreenCastSession *session,
const char *remote_desktop_session_id,
GError **error)
{
MetaScreenCast *screen_cast =
meta_screen_cast_session_get_screen_cast (session);
MetaBackend *backend = meta_screen_cast_get_backend (screen_cast);
MetaRemoteDesktop *remote_desktop = meta_backend_get_remote_desktop (backend);
MetaRemoteDesktopSession *remote_desktop_session;
remote_desktop_session =
meta_remote_desktop_get_session (remote_desktop, remote_desktop_session_id);
if (!remote_desktop_session)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"No remote desktop session found");
return FALSE;
}
if (!meta_remote_desktop_session_register_screen_cast (remote_desktop_session,
session,
error))
return FALSE;
return TRUE;
}
static void
on_session_closed (MetaScreenCastSession *session,
MetaScreenCast *screen_cast)
{
screen_cast->sessions = g_list_remove (screen_cast->sessions, session);
}
static gboolean
handle_create_session (MetaDBusScreenCast *skeleton,
GDBusMethodInvocation *invocation,
GVariant *properties)
{
MetaScreenCast *screen_cast = META_SCREEN_CAST (skeleton);
const char *peer_name;
MetaScreenCastSession *session;
GError *error = NULL;
const char *session_path;
const char *client_dbus_name;
char *remote_desktop_session_id = NULL;
gboolean disable_animations;
MetaScreenCastSessionType session_type;
if (screen_cast->inhibit_count > 0)
{
g_dbus_method_invocation_return_error (invocation, G_DBUS_ERROR,
G_DBUS_ERROR_ACCESS_DENIED,
"Session creation inhibited");
return TRUE;
}
g_variant_lookup (properties, "remote-desktop-session-id", "s",
&remote_desktop_session_id);
if (remote_desktop_session_id)
session_type = META_SCREEN_CAST_SESSION_TYPE_REMOTE_DESKTOP;
else
session_type = META_SCREEN_CAST_SESSION_TYPE_NORMAL;
peer_name = g_dbus_method_invocation_get_sender (invocation);
session = meta_screen_cast_session_new (screen_cast,
session_type,
peer_name,
&error);
if (!session)
{
g_warning ("Failed to create screen cast session: %s",
error->message);
g_dbus_method_invocation_return_error (invocation, G_DBUS_ERROR,
G_DBUS_ERROR_FAILED,
"Failed to create session: %s",
error->message);
g_error_free (error);
return TRUE;
}
if (remote_desktop_session_id)
{
if (!register_remote_desktop_screen_cast_session (session,
remote_desktop_session_id,
&error))
{
g_dbus_method_invocation_return_error (invocation, G_DBUS_ERROR,
G_DBUS_ERROR_FAILED,
"%s", error->message);
g_error_free (error);
g_object_unref (session);
return TRUE;
}
}
if (g_variant_lookup (properties, "disable-animations", "b",
&disable_animations))
{
meta_screen_cast_session_set_disable_animations (session,
disable_animations);
}
client_dbus_name = g_dbus_method_invocation_get_sender (invocation);
meta_dbus_session_watcher_watch_session (screen_cast->session_watcher,
client_dbus_name,
META_DBUS_SESSION (session));
session_path = meta_screen_cast_session_get_object_path (session);
meta_dbus_screen_cast_complete_create_session (skeleton,
invocation,
session_path);
screen_cast->sessions = g_list_append (screen_cast->sessions, session);
g_signal_connect (session, "session-closed",
G_CALLBACK (on_session_closed),
screen_cast);
return TRUE;
}
static void
meta_screen_cast_init_iface (MetaDBusScreenCastIface *iface)
{
iface->handle_create_session = handle_create_session;
}
static void
on_bus_acquired (GDBusConnection *connection,
const char *name,
gpointer user_data)
{
MetaScreenCast *screen_cast = user_data;
GDBusInterfaceSkeleton *interface_skeleton =
G_DBUS_INTERFACE_SKELETON (screen_cast);
GError *error = NULL;
if (!g_dbus_interface_skeleton_export (interface_skeleton,
connection,
META_SCREEN_CAST_DBUS_PATH,
&error))
g_warning ("Failed to export remote desktop object: %s\n", error->message);
}
static void
on_name_acquired (GDBusConnection *connection,
const char *name,
gpointer user_data)
{
g_info ("Acquired name %s\n", name);
}
static void
on_name_lost (GDBusConnection *connection,
const char *name,
gpointer user_data)
{
g_warning ("Lost or failed to acquire name %s\n", name);
}
static void
meta_screen_cast_constructed (GObject *object)
{
MetaScreenCast *screen_cast = META_SCREEN_CAST (object);
screen_cast->dbus_name_id =
g_bus_own_name (G_BUS_TYPE_SESSION,
META_SCREEN_CAST_DBUS_SERVICE,
G_BUS_NAME_OWNER_FLAGS_NONE,
on_bus_acquired,
on_name_acquired,
on_name_lost,
screen_cast,
NULL);
}
static void
meta_screen_cast_finalize (GObject *object)
{
MetaScreenCast *screen_cast = META_SCREEN_CAST (object);
if (screen_cast->dbus_name_id)
g_bus_unown_name (screen_cast->dbus_name_id);
while (screen_cast->sessions)
{
MetaScreenCastSession *session = screen_cast->sessions->data;
meta_screen_cast_session_close (session);
}
G_OBJECT_CLASS (meta_screen_cast_parent_class)->finalize (object);
}
MetaScreenCast *
meta_screen_cast_new (MetaBackend *backend,
MetaDbusSessionWatcher *session_watcher)
{
MetaScreenCast *screen_cast;
screen_cast = g_object_new (META_TYPE_SCREEN_CAST, NULL);
screen_cast->backend = backend;
screen_cast->session_watcher = session_watcher;
return screen_cast;
}
static void
meta_screen_cast_init (MetaScreenCast *screen_cast)
{
static gboolean is_pipewire_initialized = FALSE;
if (!is_pipewire_initialized)
{
pw_init (NULL, NULL);
is_pipewire_initialized = TRUE;
}
meta_dbus_screen_cast_set_version (META_DBUS_SCREEN_CAST (screen_cast),
META_SCREEN_CAST_API_VERSION);
}
static void
meta_screen_cast_class_init (MetaScreenCastClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->constructed = meta_screen_cast_constructed;
object_class->finalize = meta_screen_cast_finalize;
}
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