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gstreamer/gst-libs/gst/gl/gstglwindow.h
Vasilis Liaskovitis f803a9e746 GstGLWindow: Introduce navigation thread 
This thread dispatches navigation events. It is needed to avoid deadlocks
between window backend threads that emit navigation events (e.g. X11/GMainLoop
thread) and consumers of navigation events such as glimagesink, see
https://bugzilla.gnome.org/show_bug.cgi?id=733661

GstGlWindow_x11 thread is changed to invoke the navigation thread for navigation
dispatching, instead of emiting the event itself. Othe backends beside X11 do
not dispatch navigation events yet, but should use this thread when dispatching
these events in the future.

The navigation thread is currently part of GstGLWindow and not implemented in
separate subclasses / backends. This will be needed in the future.

gst_gl_window_x11_get_surface_dimensions is also changed to use a cached value
of the window's width, height. These values are now retrieved in the X11
thread, function gst_gl_window_x11_handle_event. This change is needed because
otherwise the XGetWindowAttributes gets called from the navigation thread,
leading to xlib aborting due to multithreaded access (if XInitThreads is not
called before, as is the case for gst-launch)
2017-12-09 19:31:46 +00:00

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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.
*/
#ifndef __GST_GL_WINDOW_H__
#define __GST_GL_WINDOW_H__
#include <gst/gst.h>
#include <gst/gl/gstgl_fwd.h>
#include <gst/gl/gstglcontext.h>
#include <gst/gl/gstgldisplay.h>
G_BEGIN_DECLS
#define GST_GL_TYPE_WINDOW (gst_gl_window_get_type())
#define GST_GL_WINDOW(o) (G_TYPE_CHECK_INSTANCE_CAST((o), GST_GL_TYPE_WINDOW, GstGLWindow))
#define GST_GL_WINDOW_CLASS(k) (G_TYPE_CHECK_CLASS((k), GST_GL_TYPE_WINDOW, GstGLWindowClass))
#define GST_GL_IS_WINDOW(o) (G_TYPE_CHECK_INSTANCE_TYPE((o), GST_GL_TYPE_WINDOW))
#define GST_GL_IS_WINDOW_CLASS(k) (G_TYPE_CHECK_CLASS_TYPE((k), GST_GL_TYPE_WINDOW))
#define GST_GL_WINDOW_GET_CLASS(o) (G_TYPE_INSTANCE_GET_CLASS((o), GST_GL_TYPE_WINDOW, GstGLWindowClass))
#define GST_GL_WINDOW_LOCK(w) g_mutex_lock(&GST_GL_WINDOW(w)->lock)
#define GST_GL_WINDOW_UNLOCK(w) g_mutex_unlock(&GST_GL_WINDOW(w)->lock)
#define GST_GL_WINDOW_GET_LOCK(w) (&GST_GL_WINDOW(w)->lock)
#define GST_GL_WINDOW_ERROR (gst_gl_window_error_quark ())
typedef enum
{
GST_GL_WINDOW_ERROR_FAILED,
GST_GL_WINDOW_ERROR_OLD_LIBS,
GST_GL_WINDOW_ERROR_RESOURCE_UNAVAILABLE,
} GstGLWindowError;
typedef void (*GstGLWindowCB) (gpointer data);
typedef void (*GstGLWindowResizeCB) (gpointer data, guint width, guint height);
#define GST_GL_WINDOW_CB(f) ((GstGLWindowCB) (f))
#define GST_GL_WINDOW_RESIZE_CB(f) ((GstGLWindowResizeCB) (f))
/**
* GstGLWindow:
*
* #GstGLWindow is an opaque struct and should only be accessed through the
* provided api.
*/
struct _GstGLWindow {
/*< private >*/
GstObject parent;
GMutex lock;
GMutex nav_lock;
GCond nav_create_cond;
GCond nav_destroy_cond;
gboolean nav_created;
gboolean nav_alive;
GstGLDisplay *display;
GWeakRef context_ref;
guintptr external_gl_context;
gboolean is_drawing;
GstGLWindowCB draw;
gpointer draw_data;
GDestroyNotify draw_notify;
GstGLWindowCB close;
gpointer close_data;
GDestroyNotify close_notify;
GstGLWindowResizeCB resize;
gpointer resize_data;
GDestroyNotify resize_notify;
/*< private >*/
gpointer _reserved[GST_PADDING];
GMainContext *navigation_context;
GMainLoop *navigation_loop;
GstGLWindowPrivate *priv;
};
/**
* GstGLWindowClass:
* @parent_class: Parent class
* @get_display: Gets the current windowing system display connection
* @set_window_handle: Set a window to render into
* @get_window_handle: Gets the current window that this #GstGLWindow is
* rendering into
* @draw_unlocked: redraw the window with the specified dimensions
* @draw: redraw the window with the specified dimensions
* @run: run the mainloop
* @quit: send a quit to the mainloop
* @send_message: invoke a function on the window thread. Required to be reentrant.
* @send_message_async: invoke a function on the window thread. @run may or may
* not have been called. Required to be reentrant.
* @open: open the connection to the display
* @close: close the connection to the display
*/
struct _GstGLWindowClass {
GstObjectClass parent_class;
guintptr (*get_display) (GstGLWindow *window);
void (*set_window_handle) (GstGLWindow *window, guintptr id);
guintptr (*get_window_handle) (GstGLWindow *window);
void (*draw_unlocked) (GstGLWindow *window, guint width, guint height);
void (*draw) (GstGLWindow *window, guint width, guint height);
void (*run) (GstGLWindow *window);
void (*quit) (GstGLWindow *window);
void (*send_message) (GstGLWindow *window, GstGLWindowCB callback, gpointer data);
void (*send_message_async) (GstGLWindow *window, GstGLWindowCB callback, gpointer data, GDestroyNotify destroy);
gboolean (*open) (GstGLWindow *window, GError **error);
void (*close) (GstGLWindow *window);
void (*get_surface_dimensions) (GstGLWindow *window, guint *width, guint *height);
/*< private >*/
gpointer _reserved[GST_PADDING];
};
struct key_event
{
GstGLWindow *window;
const char *event_type;
const char *key_str;
};
struct mouse_event
{
GstGLWindow *window;
const char *event_type;
int button;
double posx;
double posy;
};
/* methods */
GQuark gst_gl_window_error_quark (void);
GType gst_gl_window_get_type (void);
GstGLWindow * gst_gl_window_new (GstGLDisplay *display);
void gst_gl_window_set_draw_callback (GstGLWindow *window, GstGLWindowCB callback, gpointer data, GDestroyNotify destroy_notify);
void gst_gl_window_set_resize_callback (GstGLWindow *window, GstGLWindowResizeCB callback, gpointer data, GDestroyNotify destroy_notify);
void gst_gl_window_set_close_callback (GstGLWindow *window, GstGLWindowCB callback, gpointer data, GDestroyNotify destroy_notify);
void gst_gl_window_set_window_handle (GstGLWindow *window, guintptr handle);
guintptr gst_gl_window_get_window_handle (GstGLWindow *window);
void gst_gl_window_draw_unlocked (GstGLWindow *window, guint width, guint height);
void gst_gl_window_draw (GstGLWindow *window, guint width, guint height);
void gst_gl_window_run (GstGLWindow *window);
void gst_gl_window_quit (GstGLWindow *window);
void gst_gl_window_send_message (GstGLWindow *window, GstGLWindowCB callback, gpointer data);
void gst_gl_window_send_message_async (GstGLWindow *window, GstGLWindowCB callback, gpointer data, GDestroyNotify destroy);
guintptr gst_gl_window_get_display (GstGLWindow *window);
void gst_gl_window_get_surface_dimensions (GstGLWindow * window, guint * width,
guint * height);
GstGLContext * gst_gl_window_get_context (GstGLWindow *window);
gboolean gst_gl_window_is_running (GstGLWindow *window);
gboolean
gst_gl_window_key_event_cb (gpointer data);
gboolean
gst_gl_window_mouse_event_cb (gpointer data);
void gst_gl_window_send_key_event(GstGLWindow * window, const char * event_type,
const char * key_str);
void gst_gl_window_send_mouse_event(GstGLWindow * window, const char *
event_type, int button, double posx, double posy);
GST_DEBUG_CATEGORY_EXTERN (gst_gl_window_debug);
G_END_DECLS
#endif /* __GST_GL_WINDOW_H__ */
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