gstreamer/gst-libs/gst/gl/wayland/gstglwindow_wayland_egl.c

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/*
* GStreamer
* Copyright (C) 2008 Julien Isorce <julien.isorce@gmail.com>
* Copyright (C) 2012 Matthew Waters <ystreet00@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#define GLIB_DISABLE_DEPRECATION_WARNINGS
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "wayland_event_source.h"
#include "gstglwindow_wayland_egl.h"
const gchar *WlEGLErrorString ();
#define GST_CAT_DEFAULT gst_gl_window_debug
#define gst_gl_window_wayland_egl_parent_class parent_class
G_DEFINE_TYPE (GstGLWindowWaylandEGL, gst_gl_window_wayland_egl,
GST_GL_TYPE_WINDOW);
static guintptr gst_gl_window_wayland_egl_get_gl_context (GstGLWindow * window);
static gboolean gst_gl_window_wayland_egl_activate (GstGLWindow * window,
gboolean activate);
static void gst_gl_window_wayland_egl_set_window_handle (GstGLWindow * window,
guintptr handle);
static void gst_gl_window_wayland_egl_draw (GstGLWindow * window, guint width,
guint height);
static void gst_gl_window_wayland_egl_run (GstGLWindow * window);
static void gst_gl_window_wayland_egl_quit (GstGLWindow * window,
GstGLWindowCB callback, gpointer data);
static void gst_gl_window_wayland_egl_send_message (GstGLWindow * window,
GstGLWindowCB callback, gpointer data);
static void gst_gl_window_wayland_egl_destroy_context (GstGLWindowWaylandEGL *
window_egl);
static gboolean gst_gl_window_wayland_egl_create_context (GstGLWindow
* window, GstGLAPI gl_api, guintptr external_gl_context, GError ** error);
static GstGLAPI gst_gl_window_wayland_egl_get_gl_api (GstGLWindow * window);
static gpointer gst_gl_window_wayland_egl_get_proc_address (GstGLWindow *
window, const gchar * name);
static void gst_gl_window_wayland_egl_close (GstGLWindow * window);
static void
pointer_handle_enter (void *data, struct wl_pointer *pointer, uint32_t serial,
struct wl_surface *surface, wl_fixed_t sx_w, wl_fixed_t sy_w)
{
GstGLWindowWaylandEGL *window_egl = data;
window_egl->display.serial = serial;
}
static void
pointer_handle_leave (void *data, struct wl_pointer *pointer, uint32_t serial,
struct wl_surface *surface)
{
GstGLWindowWaylandEGL *window_egl = data;
window_egl->display.serial = serial;
}
static void
pointer_handle_motion (void *data, struct wl_pointer *pointer, uint32_t time,
wl_fixed_t sx_w, wl_fixed_t sy_w)
{
}
static void
pointer_handle_button (void *data, struct wl_pointer *pointer, uint32_t serial,
uint32_t time, uint32_t button, uint32_t state_w)
{
GstGLWindowWaylandEGL *window_egl = data;
window_egl->display.serial = serial;
}
static void
pointer_handle_axis (void *data, struct wl_pointer *pointer, uint32_t time,
uint32_t axis, wl_fixed_t value)
{
}
static const struct wl_pointer_listener pointer_listener = {
pointer_handle_enter,
pointer_handle_leave,
pointer_handle_motion,
pointer_handle_button,
pointer_handle_axis,
};
static void
seat_handle_capabilities (void *data, struct wl_seat *seat,
enum wl_seat_capability caps)
{
GstGLWindowWaylandEGL *window_egl = data;
struct display *display = &window_egl->display;
if ((caps & WL_SEAT_CAPABILITY_POINTER) && !display->pointer) {
display->pointer = wl_seat_get_pointer (seat);
wl_pointer_set_user_data (display->pointer, window_egl);
wl_pointer_add_listener (display->pointer, &pointer_listener, window_egl);
} else if (!(caps & WL_SEAT_CAPABILITY_POINTER) && display->pointer) {
wl_pointer_destroy (display->pointer);
display->pointer = NULL;
}
#if 0
if ((caps & WL_SEAT_CAPABILITY_KEYBOARD) && !input->keyboard) {
input->keyboard = wl_seat_get_keyboard (seat);
wl_keyboard_set_user_data (input->keyboard, input);
wl_keyboard_add_listener (input->keyboard, &keyboard_listener, input);
} else if (!(caps & WL_SEAT_CAPABILITY_KEYBOARD) && input->keyboard) {
wl_keyboard_destroy (input->keyboard);
input->keyboard = NULL;
}
#endif
}
static const struct wl_seat_listener seat_listener = {
seat_handle_capabilities,
};
static void
handle_ping (void *data, struct wl_shell_surface *shell_surface,
uint32_t serial)
{
wl_shell_surface_pong (shell_surface, serial);
}
static void window_resize (GstGLWindowWaylandEGL * window_egl, guint width,
guint height);
static void
handle_configure (void *data, struct wl_shell_surface *shell_surface,
uint32_t edges, int32_t width, int32_t height)
{
GstGLWindowWaylandEGL *window_egl = data;
GstGLWindow *window = GST_GL_WINDOW (window_egl);
GST_DEBUG ("configure event %ix%i", width, height);
window_resize (window_egl, width, height);
if (window->resize)
window->resize (window->resize_data, width, height);
}
static void
handle_popup_done (void *data, struct wl_shell_surface *shell_surface)
{
}
static const struct wl_shell_surface_listener shell_surface_listener = {
handle_ping,
handle_configure,
handle_popup_done
};
static gboolean
create_surface (GstGLWindowWaylandEGL * window_egl)
{
EGLBoolean ret;
window_egl->window.surface =
wl_compositor_create_surface (window_egl->display.compositor);
window_egl->window.shell_surface =
wl_shell_get_shell_surface (window_egl->display.shell,
window_egl->window.surface);
wl_shell_surface_add_listener (window_egl->window.shell_surface,
&shell_surface_listener, window_egl);
if (window_egl->window.window_width <= 0)
window_egl->window.window_width = 320;
if (window_egl->window.window_height <= 0)
window_egl->window.window_height = 240;
window_egl->window.native =
wl_egl_window_create (window_egl->window.surface,
window_egl->window.window_width, window_egl->window.window_height);
window_egl->egl_surface =
eglCreateWindowSurface (window_egl->egl_display, window_egl->egl_config,
window_egl->window.native, NULL);
wl_shell_surface_set_title (window_egl->window.shell_surface,
"OpenGL Renderer");
ret =
eglMakeCurrent (window_egl->egl_display, window_egl->egl_surface,
window_egl->egl_surface, window_egl->egl_context);
wl_shell_surface_set_toplevel (window_egl->window.shell_surface);
wl_shell_surface_set_fullscreen (window_egl->window.shell_surface,
WL_SHELL_SURFACE_FULLSCREEN_METHOD_SCALE, 0, NULL);
return ret == EGL_TRUE;
}
static void
destroy_surface (GstGLWindowWaylandEGL * window_egl)
{
if (window_egl->window.native)
wl_egl_window_destroy (window_egl->window.native);
if (window_egl->window.shell_surface)
wl_shell_surface_destroy (window_egl->window.shell_surface);
if (window_egl->window.surface)
wl_surface_destroy (window_egl->window.surface);
if (window_egl->window.callback)
wl_callback_destroy (window_egl->window.callback);
}
static void
registry_handle_global (void *data, struct wl_registry *registry,
uint32_t name, const char *interface, uint32_t version)
{
struct display *d = data;
if (g_strcmp0 (interface, "wl_compositor") == 0) {
d->compositor =
wl_registry_bind (registry, name, &wl_compositor_interface, 1);
} else if (g_strcmp0 (interface, "wl_shell") == 0) {
d->shell = wl_registry_bind (registry, name, &wl_shell_interface, 1);
} else if (g_strcmp0 (interface, "wl_seat") == 0) {
d->seat = wl_registry_bind (registry, name, &wl_seat_interface, 1);
wl_seat_add_listener (d->seat, &seat_listener, d);
} else if (g_strcmp0 (interface, "wl_shm") == 0) {
d->shm = wl_registry_bind (registry, name, &wl_shm_interface, 1);
d->cursor_theme = wl_cursor_theme_load (NULL, 32, d->shm);
d->default_cursor =
wl_cursor_theme_get_cursor (d->cursor_theme, "left_ptr");
}
}
static const struct wl_registry_listener registry_listener = {
registry_handle_global
};
static void
gst_gl_window_wayland_egl_class_init (GstGLWindowWaylandEGLClass * klass)
{
GstGLWindowClass *window_class = (GstGLWindowClass *) klass;
window_class->create_context =
GST_DEBUG_FUNCPTR (gst_gl_window_wayland_egl_create_context);
window_class->get_gl_context =
GST_DEBUG_FUNCPTR (gst_gl_window_wayland_egl_get_gl_context);
window_class->activate =
GST_DEBUG_FUNCPTR (gst_gl_window_wayland_egl_activate);
window_class->set_window_handle =
GST_DEBUG_FUNCPTR (gst_gl_window_wayland_egl_set_window_handle);
window_class->draw_unlocked =
GST_DEBUG_FUNCPTR (gst_gl_window_wayland_egl_draw);
window_class->draw = GST_DEBUG_FUNCPTR (gst_gl_window_wayland_egl_draw);
window_class->run = GST_DEBUG_FUNCPTR (gst_gl_window_wayland_egl_run);
window_class->quit = GST_DEBUG_FUNCPTR (gst_gl_window_wayland_egl_quit);
window_class->send_message =
GST_DEBUG_FUNCPTR (gst_gl_window_wayland_egl_send_message);
window_class->get_gl_api =
GST_DEBUG_FUNCPTR (gst_gl_window_wayland_egl_get_gl_api);
window_class->get_proc_address =
GST_DEBUG_FUNCPTR (gst_gl_window_wayland_egl_get_proc_address);
window_class->close = GST_DEBUG_FUNCPTR (gst_gl_window_wayland_egl_close);
}
static void
gst_gl_window_wayland_egl_init (GstGLWindowWaylandEGL * window)
{
window->gl_api = GST_GL_API_NONE;
}
/* Must be called in the gl thread */
GstGLWindowWaylandEGL *
gst_gl_window_wayland_egl_new (void)
{
GstGLWindowWaylandEGL *window;
GST_DEBUG ("creating Wayland EGL window");
window = g_object_new (GST_GL_TYPE_WINDOW_WAYLAND_EGL, NULL);
gst_gl_window_set_need_lock (GST_GL_WINDOW (window), FALSE);
return window;
}
static void
gst_gl_window_wayland_egl_close (GstGLWindow * window)
{
GstGLWindowWaylandEGL *window_egl;
window_egl = GST_GL_WINDOW_WAYLAND_EGL (window);
gst_gl_window_wayland_egl_destroy_context (window_egl);
if (window_egl->display.cursor_surface)
wl_surface_destroy (window_egl->display.cursor_surface);
if (window_egl->display.cursor_theme)
wl_cursor_theme_destroy (window_egl->display.cursor_theme);
if (window_egl->display.shell)
wl_shell_destroy (window_egl->display.shell);
if (window_egl->display.compositor)
wl_compositor_destroy (window_egl->display.compositor);
if (window_egl->display.display) {
wl_display_flush (window_egl->display.display);
wl_display_disconnect (window_egl->display.display);
}
}
static gboolean
_setup_wayland (GstGLWindowWaylandEGL * window_egl, GError ** error)
{
window_egl->display.display = wl_display_connect (NULL);
if (!window_egl->display.display) {
g_set_error (error, GST_GL_WINDOW_ERROR,
GST_GL_WINDOW_ERROR_RESOURCE_UNAVAILABLE,
"Failed to connect to Wayland display server");
goto error;
}
window_egl->display.registry =
wl_display_get_registry (window_egl->display.display);
wl_registry_add_listener (window_egl->display.registry, &registry_listener,
&window_egl->display);
wl_display_dispatch (window_egl->display.display);
create_surface (window_egl);
window_egl->display.cursor_surface =
wl_compositor_create_surface (window_egl->display.compositor);
window_egl->wl_source =
wayland_event_source_new (window_egl->display.display);
window_egl->main_context = g_main_context_new ();
window_egl->loop = g_main_loop_new (window_egl->main_context, FALSE);
g_source_attach (window_egl->wl_source, window_egl->main_context);
return TRUE;
error:
return FALSE;
}
gboolean
gst_gl_window_wayland_egl_create_context (GstGLWindow * window,
GstGLAPI gl_api, guintptr external_gl_context, GError ** error)
{
GstGLWindowWaylandEGL *window_egl = GST_GL_WINDOW_WAYLAND_EGL (window);
EGLint config_attrib[] = {
EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
EGL_RED_SIZE, 1,
EGL_GREEN_SIZE, 1,
EGL_BLUE_SIZE, 1,
EGL_ALPHA_SIZE, 1,
EGL_DEPTH_SIZE, 1,
EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
EGL_NONE
};
EGLint context_attrib[] = {
EGL_CONTEXT_CLIENT_VERSION, 2,
EGL_NONE
};
EGLint majorVersion;
EGLint minorVersion;
EGLint numConfigs;
if (!_setup_wayland (window_egl, error))
return FALSE;
window_egl->egl_display =
eglGetDisplay ((EGLNativeDisplayType) window_egl->display.display);
if (eglInitialize (window_egl->egl_display, &majorVersion, &minorVersion))
GST_DEBUG ("egl initialized: %d.%d", majorVersion, minorVersion);
else {
g_set_error (error, GST_GL_WINDOW_ERROR,
GST_GL_WINDOW_ERROR_RESOURCE_UNAVAILABLE,
"Failed to initialize egl: %s", WlEGLErrorString ());
goto failure;
}
if (gl_api & GST_GL_API_OPENGL) {
/* egl + opengl only available with EGL 1.4+ */
if (majorVersion == 1 && minorVersion <= 3) {
if ((gl_api & ~GST_GL_API_OPENGL) == GST_GL_API_NONE) {
g_set_error (error, GST_GL_WINDOW_ERROR, GST_GL_WINDOW_ERROR_OLD_LIBS,
"EGL version (%i.%i) too old for OpenGL support, (needed at least 1.4)",
majorVersion, minorVersion);
goto failure;
} else {
GST_WARNING
("EGL version (%i.%i) too old for OpenGL support, (needed at least 1.4)",
majorVersion, minorVersion);
if (gl_api & GST_GL_API_GLES2) {
goto try_gles2;
} else {
g_set_error (error, GST_GL_WINDOW_ERROR,
GST_GL_WINDOW_ERROR_WRONG_CONFIG,
"Failed to choose a suitable OpenGL API");
goto failure;
}
}
}
if (!eglBindAPI (EGL_OPENGL_API)) {
g_set_error (error, GST_GL_WINDOW_ERROR, GST_GL_WINDOW_ERROR_FAILED,
"Failed to bind OpenGL|ES API: %s", WlEGLErrorString ());
goto failure;
}
window_egl->gl_api = GST_GL_API_OPENGL;
} else if (gl_api & GST_GL_API_GLES2) {
try_gles2:
if (!eglBindAPI (EGL_OPENGL_ES_API)) {
g_set_error (error, GST_GL_WINDOW_ERROR, GST_GL_WINDOW_ERROR_FAILED,
"Failed to bind OpenGL|ES API: %s", WlEGLErrorString ());
goto failure;
}
window_egl->gl_api = GST_GL_API_GLES2;
}
if (eglChooseConfig (window_egl->egl_display, config_attrib,
&window_egl->egl_config, 1, &numConfigs))
GST_DEBUG ("config set: %ld, %ld", (gulong) window_egl->egl_config,
(gulong) numConfigs);
else {
g_set_error (error, GST_GL_WINDOW_ERROR, GST_GL_WINDOW_ERROR_WRONG_CONFIG,
"Failed to set window configuration: %s", WlEGLErrorString ());
goto failure;
}
GST_DEBUG ("about to create gl context");
window_egl->egl_context =
eglCreateContext (window_egl->egl_display, window_egl->egl_config,
(EGLContext) external_gl_context, context_attrib);
if (window_egl->egl_context != EGL_NO_CONTEXT)
GST_DEBUG ("gl context created: %ld", (gulong) window_egl->egl_context);
else {
g_set_error (error, GST_GL_WINDOW_ERROR, GST_GL_WINDOW_ERROR_CREATE_CONTEXT,
"Failed to create a OpenGL context: %s", WlEGLErrorString ());
goto failure;
}
create_surface (window_egl);
/* window_egl->egl_surface =
eglCreateWindowSurface (window_egl->egl_display, window_egl->config,
(EGLNativeWindowType) window_wayland_egl->internal_win_id, NULL);
if (window_egl->egl_surface != EGL_NO_SURFACE)
GST_DEBUG ("surface created: %ld", (gulong) window_egl->egl_surface);
else {
GST_DEBUG ("failed to create surface %ld, %ld, %ld, %s",
(gulong) window_egl->egl_display, (gulong) window_egl->egl_surface,
(gulong) window_egl->egl_display, WlEGLErrorString ());
goto failure;
}
*/
return TRUE;
failure:
return FALSE;
}
static void
gst_gl_window_wayland_egl_destroy_context (GstGLWindowWaylandEGL * window_egl)
{
gst_gl_window_wayland_egl_activate (GST_GL_WINDOW (window_egl), FALSE);
destroy_surface (window_egl);
if (window_egl->egl_context)
eglDestroyContext (window_egl->egl_display, window_egl->egl_context);
if (window_egl->egl_display) {
eglTerminate (window_egl->egl_display);
eglReleaseThread ();
}
}
static gboolean
gst_gl_window_wayland_egl_activate (GstGLWindow * window, gboolean activate)
{
gboolean result;
GstGLWindowWaylandEGL *window_egl;
window_egl = GST_GL_WINDOW_WAYLAND_EGL (window);
GST_DEBUG ("activate:%s", activate ? "TRUE" : "FALSE");
if (activate)
result = eglMakeCurrent (window_egl->egl_display, window_egl->egl_surface,
window_egl->egl_surface, window_egl->egl_context);
else
result = eglMakeCurrent (window_egl->egl_display, EGL_NO_SURFACE,
EGL_NO_SURFACE, EGL_NO_CONTEXT);
return result;
}
static guintptr
gst_gl_window_wayland_egl_get_gl_context (GstGLWindow * window)
{
return (guintptr) GST_GL_WINDOW_WAYLAND_EGL (window)->egl_context;
}
static GstGLAPI
gst_gl_window_wayland_egl_get_gl_api (GstGLWindow * window)
{
return GST_GL_WINDOW_WAYLAND_EGL (window)->gl_api;
}
static void
gst_gl_window_wayland_egl_swap_buffers (GstGLWindow * window)
{
GstGLWindowWaylandEGL *window_egl = GST_GL_WINDOW_WAYLAND_EGL (window);
eglSwapBuffers (window_egl->egl_display, window_egl->egl_surface);
}
static void
gst_gl_window_wayland_egl_run (GstGLWindow * window)
{
GstGLWindowWaylandEGL *window_egl;
window_egl = GST_GL_WINDOW_WAYLAND_EGL (window);
GST_LOG ("starting main loop");
g_main_loop_run (window_egl->loop);
GST_LOG ("exiting main loop");
}
static void
gst_gl_window_wayland_egl_quit (GstGLWindow * window, GstGLWindowCB callback,
gpointer data)
{
GstGLWindowWaylandEGL *window_egl;
window_egl = GST_GL_WINDOW_WAYLAND_EGL (window);
if (callback)
gst_gl_window_wayland_egl_send_message (window, callback, data);
GST_LOG ("sending quit");
g_main_loop_quit (window_egl->loop);
GST_LOG ("quit sent");
}
typedef struct _GstGLMessage
{
GMutex lock;
GCond cond;
gboolean fired;
GstGLWindowCB callback;
gpointer data;
} GstGLMessage;
static gboolean
_run_message (GstGLMessage * message)
{
g_mutex_lock (&message->lock);
if (message->callback)
message->callback (message->data);
message->fired = TRUE;
g_cond_signal (&message->cond);
g_mutex_unlock (&message->lock);
return FALSE;
}
static void
gst_gl_window_wayland_egl_send_message (GstGLWindow * window,
GstGLWindowCB callback, gpointer data)
{
GstGLWindowWaylandEGL *window_egl;
GstGLMessage message;
window_egl = GST_GL_WINDOW_WAYLAND_EGL (window);
message.callback = callback;
message.data = data;
message.fired = FALSE;
g_mutex_init (&message.lock);
g_cond_init (&message.cond);
g_mutex_lock (&message.lock);
g_main_context_invoke (window_egl->main_context, (GSourceFunc) _run_message,
&message);
while (!message.fired)
g_cond_wait (&message.cond, &message.lock);
g_mutex_unlock (&message.lock);
}
static void
gst_gl_window_wayland_egl_set_window_handle (GstGLWindow * window,
guintptr handle)
{
}
static void
window_resize (GstGLWindowWaylandEGL * window_egl, guint width, guint height)
{
GST_DEBUG ("resizing window from %ux%u to %ux%u",
window_egl->window.window_width, window_egl->window.window_height, width,
height);
if (window_egl->window.native) {
wl_egl_window_resize (window_egl->window.native, width, height, 0, 0);
}
window_egl->window.window_width = width;
window_egl->window.window_height = height;
#if 0
wl_shell_surface_resize (window_egl->window.shell_surface,
window_egl->display.seat, window_egl->display.serial, 0);
#endif
}
struct draw
{
GstGLWindowWaylandEGL *window;
guint width, height;
};
static void
draw_cb (gpointer data)
{
struct draw *draw_data = data;
GstGLWindowWaylandEGL *window_egl = draw_data->window;
GstGLWindow *window = GST_GL_WINDOW (window_egl);
if (window_egl->window.window_width != draw_data->width
|| window_egl->window.window_height != draw_data->height) {
GST_DEBUG ("dimensions don't match, attempting resize");
#if 0
window_resize (window_egl, draw_data->width, draw_data->height);
#endif
}
if (window->draw)
window->draw (window->draw_data);
gst_gl_window_wayland_egl_swap_buffers (window);
}
static void
gst_gl_window_wayland_egl_draw (GstGLWindow * window, guint width, guint height)
{
struct draw draw_data;
draw_data.window = GST_GL_WINDOW_WAYLAND_EGL (window);
draw_data.width = width;
draw_data.height = height;
gst_gl_window_send_message (window, (GstGLWindowCB) draw_cb, &draw_data);
}
static gpointer
gst_gl_window_wayland_egl_get_proc_address (GstGLWindow * window,
const gchar * name)
{
gpointer result;
if (!(result = eglGetProcAddress (name))) {
result = gst_gl_window_default_get_proc_address (window, name);
}
return result;
}
const gchar *
WlEGLErrorString ()
{
EGLint nErr = eglGetError ();
switch (nErr) {
case EGL_SUCCESS:
return "EGL_SUCCESS";
case EGL_BAD_DISPLAY:
return "EGL_BAD_DISPLAY";
case EGL_NOT_INITIALIZED:
return "EGL_NOT_INITIALIZED";
case EGL_BAD_ACCESS:
return "EGL_BAD_ACCESS";
case EGL_BAD_ALLOC:
return "EGL_BAD_ALLOC";
case EGL_BAD_ATTRIBUTE:
return "EGL_BAD_ATTRIBUTE";
case EGL_BAD_CONFIG:
return "EGL_BAD_CONFIG";
case EGL_BAD_CONTEXT:
return "EGL_BAD_CONTEXT";
case EGL_BAD_CURRENT_SURFACE:
return "EGL_BAD_CURRENT_SURFACE";
case EGL_BAD_MATCH:
return "EGL_BAD_MATCH";
case EGL_BAD_NATIVE_PIXMAP:
return "EGL_BAD_NATIVE_PIXMAP";
case EGL_BAD_NATIVE_WINDOW:
return "EGL_BAD_NATIVE_WINDOW";
case EGL_BAD_PARAMETER:
return "EGL_BAD_PARAMETER";
case EGL_BAD_SURFACE:
return "EGL_BAD_SURFACE";
default:
return "unknown";
}
}