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/* GStreamer Navigation
* Copyright (C) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
* Copyright (C) 2003 David A. Schleef <ds@schleef.org>
*
* navigation.h: navigation interface design
*
* 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_NAVIGATION_H__
#define __GST_NAVIGATION_H__
#include <gst/gst.h>
#include <gst/video/video-prelude.h>
G_BEGIN_DECLS
#define GST_TYPE_NAVIGATION \
(gst_navigation_get_type ())
#define GST_NAVIGATION(obj) \
(G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_NAVIGATION, GstNavigation))
#define GST_IS_NAVIGATION(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_NAVIGATION))
#define GST_NAVIGATION_GET_INTERFACE(obj) \
(G_TYPE_INSTANCE_GET_INTERFACE ((obj), GST_TYPE_NAVIGATION, GstNavigationInterface))
typedef struct _GstNavigation GstNavigation;
typedef struct _GstNavigationInterface GstNavigationInterface;
/**
* GstNavigationModifierType:
* @GST_NAVIGATION_MODIFIER_SHIFT_MASK: the Shift key.
* @GST_NAVIGATION_MODIFIER_CONTROL_MASK: the Control key.
* @GST_NAVIGATION_MODIFIER_ALT_MASK: the fourth modifier key
* @GST_NAVIGATION_MODIFIER_BUTTON1_MASK: the first mouse button (usually the left button).
* @GST_NAVIGATION_MODIFIER_BUTTON2_MASK: the second mouse button (usually the right button).
* @GST_NAVIGATION_MODIFIER_BUTTON3_MASK: the third mouse button (usually the mouse wheel button or middle button).
* @GST_NAVIGATION_MODIFIER_BUTTON4_MASK: the fourth mouse button (typically the "Back" button).
* @GST_NAVIGATION_MODIFIER_BUTTON5_MASK: the fifth mouse button (typically the "forward" button).
* @GST_NAVIGATION_MODIFIER_SUPER_MASK: the Super modifier
* @GST_NAVIGATION_MODIFIER_HYPER_MASK: the Hyper modifier
* @GST_NAVIGATION_MODIFIER_META_MASK: the Meta modifier
* @GST_NAVIGATION_MODIFIER_MASK: A mask covering all entries in #GdkModifierType.
*
* Flags to indicate the state of modifier keys and mouse buttons
* in events.
*
* Typical modifier keys are Shift, Control, Meta, Super, Hyper, Alt, Compose,
* Apple, CapsLock or ShiftLock.
*
* Since: 1.22
*/
typedef enum
{
GST_NAVIGATION_MODIFIER_NONE = 0,
GST_NAVIGATION_MODIFIER_SHIFT_MASK = 1 << 0,
GST_NAVIGATION_MODIFIER_LOCK_MASK = 1 << 1,
GST_NAVIGATION_MODIFIER_CONTROL_MASK = 1 << 2,
GST_NAVIGATION_MODIFIER_ALT_MASK = 1 << 3,
GST_NAVIGATION_MODIFIER_BUTTON1_MASK = 1 << 8,
GST_NAVIGATION_MODIFIER_BUTTON2_MASK = 1 << 9,
GST_NAVIGATION_MODIFIER_BUTTON3_MASK = 1 << 10,
GST_NAVIGATION_MODIFIER_BUTTON4_MASK = 1 << 11,
GST_NAVIGATION_MODIFIER_BUTTON5_MASK = 1 << 12,
GST_NAVIGATION_MODIFIER_SUPER_MASK = 1 << 26,
GST_NAVIGATION_MODIFIER_HYPER_MASK = 1 << 27,
GST_NAVIGATION_MODIFIER_META_MASK = 1 << 28,
GST_NAVIGATION_MODIFIER_MASK = (
GST_NAVIGATION_MODIFIER_NONE |
GST_NAVIGATION_MODIFIER_SHIFT_MASK |
GST_NAVIGATION_MODIFIER_LOCK_MASK |
GST_NAVIGATION_MODIFIER_CONTROL_MASK |
GST_NAVIGATION_MODIFIER_ALT_MASK |
GST_NAVIGATION_MODIFIER_BUTTON1_MASK |
GST_NAVIGATION_MODIFIER_BUTTON2_MASK |
GST_NAVIGATION_MODIFIER_BUTTON3_MASK |
GST_NAVIGATION_MODIFIER_BUTTON4_MASK |
GST_NAVIGATION_MODIFIER_BUTTON5_MASK |
GST_NAVIGATION_MODIFIER_SUPER_MASK |
GST_NAVIGATION_MODIFIER_HYPER_MASK |
GST_NAVIGATION_MODIFIER_META_MASK
)
} GstNavigationModifierType;
/**
* GstNavigationInterface:
* @iface: the parent interface
* @send_event: sending a navigation event
* @send_event_simple: sending a navigation event (Since: 1.22)
*
* Navigation interface.
*/
struct _GstNavigationInterface {
GTypeInterface iface;
/* virtual functions */
/**
* GstNavigationInterface::send_event:
*
* sending a navigation event.
*
* Deprecated: 1.22: Use #GstNavigationInterface.send_event_simple() instead.
*/
void (*send_event) (GstNavigation *navigation, GstStructure *structure);
/**
* GstNavigationInterface::send_event_simple:
* @navigation: The navigation interface instance
* @event: (transfer full): The event to send
*
* sending a navigation event.
*
* Since: 1.22
*/
void (*send_event_simple) (GstNavigation *navigation, GstEvent *event);
};
GST_VIDEO_API
GType gst_navigation_get_type (void);
/* Navigation commands */
/**
* GstNavigationCommand:
* @GST_NAVIGATION_COMMAND_INVALID: An invalid command entry
* @GST_NAVIGATION_COMMAND_MENU1: Execute navigation menu command 1. For DVD,
* this enters the DVD root menu, or exits back to the title from the menu.
* @GST_NAVIGATION_COMMAND_MENU2: Execute navigation menu command 2. For DVD,
* this jumps to the DVD title menu.
* @GST_NAVIGATION_COMMAND_MENU3: Execute navigation menu command 3. For DVD,
* this jumps into the DVD root menu.
* @GST_NAVIGATION_COMMAND_MENU4: Execute navigation menu command 4. For DVD,
* this jumps to the Subpicture menu.
* @GST_NAVIGATION_COMMAND_MENU5: Execute navigation menu command 5. For DVD,
* the jumps to the audio menu.
* @GST_NAVIGATION_COMMAND_MENU6: Execute navigation menu command 6. For DVD,
* this jumps to the angles menu.
* @GST_NAVIGATION_COMMAND_MENU7: Execute navigation menu command 7. For DVD,
* this jumps to the chapter menu.
* @GST_NAVIGATION_COMMAND_LEFT: Select the next button to the left in a menu,
* if such a button exists.
* @GST_NAVIGATION_COMMAND_RIGHT: Select the next button to the right in a menu,
* if such a button exists.
* @GST_NAVIGATION_COMMAND_UP: Select the button above the current one in a
* menu, if such a button exists.
* @GST_NAVIGATION_COMMAND_DOWN: Select the button below the current one in a
* menu, if such a button exists.
* @GST_NAVIGATION_COMMAND_ACTIVATE: Activate (click) the currently selected
* button in a menu, if such a button exists.
* @GST_NAVIGATION_COMMAND_PREV_ANGLE: Switch to the previous angle in a
* multiangle feature.
* @GST_NAVIGATION_COMMAND_NEXT_ANGLE: Switch to the next angle in a multiangle
* feature.
*
* A set of commands that may be issued to an element providing the
* #GstNavigation interface. The available commands can be queried via
* the gst_navigation_query_new_commands() query.
*
* For convenience in handling DVD navigation, the MENU commands are aliased as:
* GST_NAVIGATION_COMMAND_DVD_MENU = @GST_NAVIGATION_COMMAND_MENU1
* GST_NAVIGATION_COMMAND_DVD_TITLE_MENU = @GST_NAVIGATION_COMMAND_MENU2
* GST_NAVIGATION_COMMAND_DVD_ROOT_MENU = @GST_NAVIGATION_COMMAND_MENU3
* GST_NAVIGATION_COMMAND_DVD_SUBPICTURE_MENU = @GST_NAVIGATION_COMMAND_MENU4
* GST_NAVIGATION_COMMAND_DVD_AUDIO_MENU = @GST_NAVIGATION_COMMAND_MENU5
* GST_NAVIGATION_COMMAND_DVD_ANGLE_MENU = @GST_NAVIGATION_COMMAND_MENU6
* GST_NAVIGATION_COMMAND_DVD_CHAPTER_MENU = @GST_NAVIGATION_COMMAND_MENU7
*/
typedef enum {
GST_NAVIGATION_COMMAND_INVALID = 0,
GST_NAVIGATION_COMMAND_MENU1 = 1,
GST_NAVIGATION_COMMAND_MENU2 = 2,
GST_NAVIGATION_COMMAND_MENU3 = 3,
GST_NAVIGATION_COMMAND_MENU4 = 4,
GST_NAVIGATION_COMMAND_MENU5 = 5,
GST_NAVIGATION_COMMAND_MENU6 = 6,
GST_NAVIGATION_COMMAND_MENU7 = 7,
GST_NAVIGATION_COMMAND_LEFT = 20,
GST_NAVIGATION_COMMAND_RIGHT = 21,
GST_NAVIGATION_COMMAND_UP = 22,
GST_NAVIGATION_COMMAND_DOWN = 23,
GST_NAVIGATION_COMMAND_ACTIVATE = 24,
GST_NAVIGATION_COMMAND_PREV_ANGLE = 30,
GST_NAVIGATION_COMMAND_NEXT_ANGLE = 31
} GstNavigationCommand;
/* Some aliases for the menu command types */
#define GST_NAVIGATION_COMMAND_DVD_MENU GST_NAVIGATION_COMMAND_MENU1
#define GST_NAVIGATION_COMMAND_DVD_TITLE_MENU GST_NAVIGATION_COMMAND_MENU2
#define GST_NAVIGATION_COMMAND_DVD_ROOT_MENU GST_NAVIGATION_COMMAND_MENU3
#define GST_NAVIGATION_COMMAND_DVD_SUBPICTURE_MENU GST_NAVIGATION_COMMAND_MENU4
#define GST_NAVIGATION_COMMAND_DVD_AUDIO_MENU GST_NAVIGATION_COMMAND_MENU5
#define GST_NAVIGATION_COMMAND_DVD_ANGLE_MENU GST_NAVIGATION_COMMAND_MENU6
#define GST_NAVIGATION_COMMAND_DVD_CHAPTER_MENU GST_NAVIGATION_COMMAND_MENU7
/* Queries */
/**
* GstNavigationQueryType:
* @GST_NAVIGATION_QUERY_INVALID: invalid query
* @GST_NAVIGATION_QUERY_COMMANDS: command query
* @GST_NAVIGATION_QUERY_ANGLES: viewing angle query
*
* Types of navigation interface queries.
*/
typedef enum
{
GST_NAVIGATION_QUERY_INVALID = 0,
GST_NAVIGATION_QUERY_COMMANDS = 1,
GST_NAVIGATION_QUERY_ANGLES = 2
} GstNavigationQueryType;
GST_VIDEO_API
GstNavigationQueryType gst_navigation_query_get_type (GstQuery *query);
GST_VIDEO_API
GstQuery * gst_navigation_query_new_commands (void);
GST_VIDEO_API
void gst_navigation_query_set_commands (GstQuery *query, gint n_cmds, ...);
GST_VIDEO_API
void gst_navigation_query_set_commandsv (GstQuery *query, gint n_cmds,
GstNavigationCommand *cmds);
GST_VIDEO_API
gboolean gst_navigation_query_parse_commands_length (GstQuery *query,
guint *n_cmds);
GST_VIDEO_API
gboolean gst_navigation_query_parse_commands_nth (GstQuery *query, guint nth,
GstNavigationCommand *cmd);
GST_VIDEO_API
GstQuery * gst_navigation_query_new_angles (void);
GST_VIDEO_API
void gst_navigation_query_set_angles (GstQuery *query, guint cur_angle,
guint n_angles);
GST_VIDEO_API
gboolean gst_navigation_query_parse_angles (GstQuery *query, guint *cur_angle,
guint *n_angles);
/* Element messages */
/**
* GstNavigationMessageType:
* @GST_NAVIGATION_MESSAGE_INVALID: Returned from
* gst_navigation_message_get_type() when the passed message is not a
* navigation message.
* @GST_NAVIGATION_MESSAGE_MOUSE_OVER: Sent when the mouse moves over or leaves a
* clickable region of the output, such as a DVD menu button.
* @GST_NAVIGATION_MESSAGE_COMMANDS_CHANGED: Sent when the set of available commands
* changes and should re-queried by interested applications.
* @GST_NAVIGATION_MESSAGE_ANGLES_CHANGED: Sent when display angles in a multi-angle
* feature (such as a multiangle DVD) change - either angles have appeared or
* disappeared.
* @GST_NAVIGATION_MESSAGE_EVENT: Sent when a navigation event was not handled
* by any element in the pipeline (Since: 1.6)
*
* A set of notifications that may be received on the bus when navigation
* related status changes.
*/
typedef enum {
GST_NAVIGATION_MESSAGE_INVALID,
GST_NAVIGATION_MESSAGE_MOUSE_OVER,
GST_NAVIGATION_MESSAGE_COMMANDS_CHANGED,
GST_NAVIGATION_MESSAGE_ANGLES_CHANGED,
GST_NAVIGATION_MESSAGE_EVENT
} GstNavigationMessageType;
GST_VIDEO_API
GstNavigationMessageType gst_navigation_message_get_type (GstMessage *message);
GST_VIDEO_API
GstMessage * gst_navigation_message_new_mouse_over (GstObject *src,
gboolean active);
GST_VIDEO_API
gboolean gst_navigation_message_parse_mouse_over (GstMessage *message,
gboolean *active);
GST_VIDEO_API
GstMessage * gst_navigation_message_new_commands_changed (GstObject *src);
GST_VIDEO_API
GstMessage * gst_navigation_message_new_angles_changed (GstObject *src,
guint cur_angle,
guint n_angles);
GST_VIDEO_API
gboolean gst_navigation_message_parse_angles_changed (GstMessage *message,
guint *cur_angle,
guint *n_angles);
GST_VIDEO_API
GstMessage * gst_navigation_message_new_event (GstObject *src,
GstEvent *event);
GST_VIDEO_API
gboolean gst_navigation_message_parse_event (GstMessage *message,
GstEvent ** event);
/* event parsing functions */
/**
* GstNavigationEventType:
* @GST_NAVIGATION_EVENT_INVALID: Returned from
* gst_navigation_event_get_type() when the passed event is not a navigation event.
* @GST_NAVIGATION_EVENT_KEY_PRESS: A key press event. Use
* gst_navigation_event_parse_key_event() to extract the details from the event.
* @GST_NAVIGATION_EVENT_KEY_RELEASE: A key release event. Use
* gst_navigation_event_parse_key_event() to extract the details from the event.
* @GST_NAVIGATION_EVENT_MOUSE_BUTTON_PRESS: A mouse button press event. Use
* gst_navigation_event_parse_mouse_button_event() to extract the details from the
* event.
* @GST_NAVIGATION_EVENT_MOUSE_BUTTON_RELEASE: A mouse button release event. Use
* gst_navigation_event_parse_mouse_button_event() to extract the details from the
* event.
* @GST_NAVIGATION_EVENT_MOUSE_MOVE: A mouse movement event. Use
* gst_navigation_event_parse_mouse_move_event() to extract the details from the
* event.
* @GST_NAVIGATION_EVENT_COMMAND: A navigation command event. Use
* gst_navigation_event_parse_command() to extract the details from the event.
* @GST_NAVIGATION_EVENT_MOUSE_SCROLL: A mouse scroll event. Use
* gst_navigation_event_parse_mouse_scroll_event() to extract the details from
* the event. (Since: 1.18)
* @GST_NAVIGATION_EVENT_TOUCH_DOWN: An event describing a new touch point,
* which will be assigned an identifier that is unique to it for the duration
* of its movement on the screen. Use gst_navigation_event_parse_touch_event()
* to extract the details from the event. (Since: 1.22)
* @GST_NAVIGATION_EVENT_TOUCH_MOTION: An event describing the movement of an
* active touch point across the screen. Use
* gst_navigation_event_parse_touch_event() to extract the details from the
* event. (Since: 1.22)
* @GST_NAVIGATION_EVENT_TOUCH_UP: An event describing a removed touch point.
* After this event, its identifier may be reused for any new touch points. Use
* gst_navigation_event_parse_touch_up_event() to extract the details from the
* event. (Since: 1.22)
* @GST_NAVIGATION_EVENT_TOUCH_FRAME: An event signaling the end of a sequence
* of simultaneous touch events. (Since: 1.22)
* @GST_NAVIGATION_EVENT_TOUCH_CANCEL: An event cancelling all currently active
* touch points. (Since: 1.22)
*
* Enum values for the various events that an element implementing the
* GstNavigation interface might send up the pipeline. Touch events have been
* inspired by the libinput API, and have the same meaning here.
*/
typedef enum {
GST_NAVIGATION_EVENT_INVALID = 0,
GST_NAVIGATION_EVENT_KEY_PRESS = 1,
GST_NAVIGATION_EVENT_KEY_RELEASE = 2,
GST_NAVIGATION_EVENT_MOUSE_BUTTON_PRESS = 3,
GST_NAVIGATION_EVENT_MOUSE_BUTTON_RELEASE = 4,
GST_NAVIGATION_EVENT_MOUSE_MOVE = 5,
GST_NAVIGATION_EVENT_COMMAND = 6,
/**
* GST_NAVIGATION_EVENT_MOUSE_SCROLL:
*
* A mouse scroll event. Use gst_navigation_event_parse_mouse_scroll_event()
* to extract the details from the event.
*
* Since: 1.18
*/
GST_NAVIGATION_EVENT_MOUSE_SCROLL = 7,
/**
* GST_NAVIGATION_EVENT_TOUCH_DOWN:
*
* An event describing a new touch point, which will be assigned an identifier
* that is unique to it for the duration of its movement on the screen.
* Use gst_navigation_event_parse_touch_event() to extract the details
* from the event.
*
* Since: 1.22
*/
GST_NAVIGATION_EVENT_TOUCH_DOWN = 8,
/**
* GST_NAVIGATION_EVENT_TOUCH_MOTION:
*
* An event describing the movement of an active touch point across
* the screen. Use gst_navigation_event_parse_touch_event() to extract
* the details from the event.
*
* Since: 1.22
*/
GST_NAVIGATION_EVENT_TOUCH_MOTION = 9,
/**
* GST_NAVIGATION_EVENT_TOUCH_UP:
*
* An event describing a removed touch point. After this event,
* its identifier may be reused for any new touch points.
* Use gst_navigation_event_parse_touch_up_event() to extract the details
* from the event.
*
* Since: 1.22
*/
GST_NAVIGATION_EVENT_TOUCH_UP = 10,
/**
* GST_NAVIGATION_EVENT_TOUCH_FRAME:
*
* An event signaling the end of a sequence of simultaneous touch events.
*
* Since: 1.22
*/
GST_NAVIGATION_EVENT_TOUCH_FRAME = 11,
/**
* GST_NAVIGATION_EVENT_TOUCH_CANCEL:
*
* An event cancelling all currently active touch points.
*
* Since: 1.22
*/
GST_NAVIGATION_EVENT_TOUCH_CANCEL = 12,
} GstNavigationEventType;
GST_VIDEO_API
GstNavigationEventType gst_navigation_event_get_type (GstEvent *event);
GST_VIDEO_API
GstEvent* gst_navigation_event_new_key_press (const gchar * key,
GstNavigationModifierType state) G_GNUC_MALLOC;
GST_VIDEO_API
GstEvent* gst_navigation_event_new_key_release (const gchar * key,
GstNavigationModifierType state) G_GNUC_MALLOC;
GST_VIDEO_API
GstEvent* gst_navigation_event_new_mouse_button_press (gint button, gdouble x,
gdouble y,
GstNavigationModifierType state) G_GNUC_MALLOC;
GST_VIDEO_API
GstEvent* gst_navigation_event_new_mouse_button_release (gint button, gdouble x,
gdouble y,
GstNavigationModifierType state) G_GNUC_MALLOC;
GST_VIDEO_API
GstEvent* gst_navigation_event_new_mouse_move (gdouble x,
gdouble y,
GstNavigationModifierType state) G_GNUC_MALLOC;
GST_VIDEO_API
GstEvent* gst_navigation_event_new_mouse_scroll (gdouble x, gdouble y,
gdouble delta_x, gdouble delta_y,
GstNavigationModifierType state) G_GNUC_MALLOC;
GST_VIDEO_API
GstEvent* gst_navigation_event_new_command (GstNavigationCommand command) G_GNUC_MALLOC;
GST_VIDEO_API
GstEvent* gst_navigation_event_new_touch_down (guint identifier,
gdouble x, gdouble y,
gdouble pressure,
GstNavigationModifierType state) G_GNUC_MALLOC;
GST_VIDEO_API
GstEvent* gst_navigation_event_new_touch_motion (guint identifier,
gdouble x, gdouble y,
gdouble pressure,
GstNavigationModifierType state) G_GNUC_MALLOC;
GST_VIDEO_API
GstEvent* gst_navigation_event_new_touch_up (guint identifier,
gdouble x, gdouble y,
GstNavigationModifierType state) G_GNUC_MALLOC;
GST_VIDEO_API
GstEvent* gst_navigation_event_new_touch_frame (GstNavigationModifierType state) G_GNUC_MALLOC;
GST_VIDEO_API
GstEvent* gst_navigation_event_new_touch_cancel (GstNavigationModifierType state) G_GNUC_MALLOC;
GST_VIDEO_API
gboolean gst_navigation_event_parse_key_event (GstEvent *event,
const gchar **key);
GST_VIDEO_API
gboolean gst_navigation_event_parse_mouse_button_event (GstEvent *event,
gint *button, gdouble *x, gdouble *y);
GST_VIDEO_API
gboolean gst_navigation_event_parse_mouse_move_event (GstEvent *event,
gdouble *x, gdouble *y);
GST_VIDEO_API
gboolean gst_navigation_event_parse_mouse_scroll_event (GstEvent *event,
gdouble *x, gdouble *y,
gdouble *delta_x, gdouble *delta_y);
GST_VIDEO_API
gboolean gst_navigation_event_parse_command (GstEvent *event,
GstNavigationCommand *command);
GST_VIDEO_API
gboolean gst_navigation_event_parse_touch_event (GstEvent * event,
guint * identifier,
gdouble * x, gdouble * y,
gdouble * pressure);
GST_VIDEO_API
gboolean gst_navigation_event_parse_touch_up_event (GstEvent * event,
guint * identifier,
gdouble * x, gdouble * y);
GST_VIDEO_API
gboolean gst_navigation_event_get_coordinates (GstEvent * event,
gdouble * x, gdouble * y);
GST_VIDEO_API
gboolean gst_navigation_event_set_coordinates (GstEvent * event,
gdouble x, gdouble y);
/* interface virtual function wrappers */
GST_VIDEO_DEPRECATED_FOR(gst_navigation_send_event_simple)
void gst_navigation_send_event (GstNavigation *navigation,
GstStructure *structure);
GST_VIDEO_DEPRECATED_FOR(gst_navigation_send_event_simple)
void gst_navigation_send_key_event (GstNavigation *navigation,
const char *event, const char *key);
GST_VIDEO_DEPRECATED_FOR(gst_navigation_send_event_simple)
void gst_navigation_send_mouse_event (GstNavigation *navigation,
const char *event, int button, double x, double y);
GST_VIDEO_DEPRECATED_FOR(gst_navigation_send_event_simple)
void gst_navigation_send_mouse_scroll_event (GstNavigation *navigation,
double x, double y, double delta_x, double delta_y);
GST_VIDEO_DEPRECATED_FOR(gst_navigation_send_event_simple)
void gst_navigation_send_command (GstNavigation *navigation,
GstNavigationCommand command);
GST_VIDEO_API
void gst_navigation_send_event_simple (GstNavigation *navigation,
GstEvent *event);
GST_VIDEO_API
gboolean gst_navigation_event_parse_state (GstEvent *event,
GstNavigationModifierType *state);
G_END_DECLS
#endif /* __GST_NAVIGATION_H__ */
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