path: root/gst/gstpad.h

/* GStreamer
 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
 *                    2000 Wim Taymans <wim.taymans@chello.be>
 *
 * gstpad.h: Header for GstPad object
 *
 * 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., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */


#ifndef __GST_PAD_H__
#define __GST_PAD_H__

#include <gst/gstconfig.h>

#include <gst/gstobject.h>
#include <gst/gstaction.h>
#include <gst/gstbuffer.h>
#include <gst/gstcaps.h>
#include <gst/gstevent.h>
#include <gst/gstquery.h>


G_BEGIN_DECLS

GST_EXPORT GType _gst_pad_type;
GST_EXPORT GType _gst_real_pad_type;
GST_EXPORT GType _gst_ghost_pad_type;

/*
 * Pad base class
 */
#define GST_TYPE_PAD			(_gst_pad_type)
#define GST_IS_PAD(obj)			(G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_PAD))
#define GST_IS_PAD_FAST(obj)		(G_OBJECT_TYPE(obj) == GST_TYPE_REAL_PAD || \
					 G_OBJECT_TYPE(obj) == GST_TYPE_GHOST_PAD)
#define GST_IS_PAD_CLASS(klass)		(G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_PAD))
#define GST_PAD(obj)			(G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_PAD, GstPad))
#define GST_PAD_CLASS(klass)		(G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_PAD, GstPadClass))

/*
 * Real Pads
 */
#define GST_TYPE_REAL_PAD		(_gst_real_pad_type)
#define GST_IS_REAL_PAD(obj)		(G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_REAL_PAD))
#define GST_IS_REAL_PAD_FAST(obj)	(G_OBJECT_TYPE(obj) == GST_TYPE_REAL_PAD)
#define GST_IS_REAL_PAD_CLASS(klass)	(G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_REAL_PAD))
#define GST_REAL_PAD(obj)		(G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_REAL_PAD, GstRealPad))
#define GST_REAL_PAD_CLASS(klass)	(G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_REAL_PAD, GstRealPadClass))

/*
 * Ghost Pads
 */
#define GST_TYPE_GHOST_PAD		(_gst_ghost_pad_type)
#define GST_IS_GHOST_PAD(obj)		(G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_GHOST_PAD))
#define GST_IS_GHOST_PAD_FAST(obj)	(G_OBJECT_TYPE(obj) == GST_TYPE_GHOST_PAD)
#define GST_IS_GHOST_PAD_CLASS(klass)	(G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_GHOST_PAD))
#define GST_GHOST_PAD(obj)		(G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_GHOST_PAD, GstGhostPad))
#define GST_GHOST_PAD_CLASS(klass)	(G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_GHOST_PAD, GstGhostPadClass))


typedef struct _GstGhostPad GstGhostPad;
typedef struct _GstGhostPadClass GstGhostPadClass;
typedef struct _GstStaticPadTemplate GstStaticPadTemplate;
typedef struct _GstPadLink GstPadLink;

typedef enum {
  GST_PAD_LINK_REFUSED = -1,
  GST_PAD_LINK_DELAYED =  0,
  GST_PAD_LINK_OK      =  1,
  GST_PAD_LINK_DONE    =  2
} GstPadLinkReturn;

#define GST_PAD_LINK_FAILED(ret) (ret < GST_PAD_LINK_OK)
#define GST_PAD_LINK_SUCCESSFUL(ret) (ret >= GST_PAD_LINK_OK)

/* convenience functions */
#ifndef GST_DISABLE_DEPRECATED
#ifdef G_HAVE_ISO_VARARGS
#define GST_PAD_QUERY_TYPE_FUNCTION(functionname, ...)  GST_QUERY_TYPE_FUNCTION (GstPad *, functionname, __VA_ARGS__);
#define GST_PAD_FORMATS_FUNCTION(functionname, ...)	GST_FORMATS_FUNCTION (GstPad *, functionname, __VA_ARGS__);
#define GST_PAD_EVENT_MASK_FUNCTION(functionname, ...)	GST_EVENT_MASK_FUNCTION (GstPad *, functionname, __VA_ARGS__);
#elif defined(G_HAVE_GNUC_VARARGS)
#define GST_PAD_QUERY_TYPE_FUNCTION(functionname, a...) GST_QUERY_TYPE_FUNCTION (GstPad *, functionname, a);
#define GST_PAD_FORMATS_FUNCTION(functionname, a...)	GST_FORMATS_FUNCTION (GstPad *, functionname, a);
#define GST_PAD_EVENT_MASK_FUNCTION(functionname, a...) GST_EVENT_MASK_FUNCTION (GstPad *, functionname, a);
#endif
#endif


/* this defines the functions used to chain buffers
 * pad is the sink pad (so the same chain function can be used for N pads)
 * buf is the buffer being passed */
typedef void			(*GstPadChainFunction)		(GstPad *pad,GstData *data);
typedef GstData*		(*GstPadGetFunction)		(GstPad *pad);
typedef gboolean		(*GstPadEventFunction)		(GstPad *pad, GstEvent *event);
typedef gboolean		(*GstPadConvertFunction)	(GstPad *pad,
								 GstFormat src_format,  gint64  src_value,
								 GstFormat *dest_format, gint64 *dest_value);
typedef gboolean		(*GstPadQueryFunction)		(GstPad *pad, GstQueryType type,
								 GstFormat *format, gint64  *value);
typedef GList*			(*GstPadIntLinkFunction)	(GstPad *pad);
typedef const GstFormat*	(*GstPadFormatsFunction)	(GstPad *pad);
typedef const GstQueryType*	(*GstPadQueryTypeFunction)	(GstPad *pad);

typedef GstPadLinkReturn	(*GstPadLinkFunction)		(GstPad *pad, const GstCaps *caps);
typedef void			(*GstPadUnlinkFunction)		(GstPad *pad);
typedef GstCaps*		(*GstPadGetCapsFunction)	(GstPad *pad);
typedef GstCaps*		(*GstPadFixateFunction)		(GstPad *pad, const GstCaps *caps);
typedef GstBuffer*		(*GstPadBufferAllocFunction)	(GstPad *pad, guint64 offset, guint size);

typedef gboolean		(*GstPadDispatcherFunction)	(GstPad *pad, gpointer data);

typedef enum {
  GST_PAD_UNKNOWN,
  GST_PAD_SRC,
  GST_PAD_SINK
} GstPadDirection;

typedef enum {
  GST_PAD_NEGOTIATING		= GST_OBJECT_FLAG_LAST,
  GST_PAD_DISPATCHING,

  GST_PAD_FLAG_LAST		= GST_OBJECT_FLAG_LAST + 4
} GstPadFlags;

struct _GstPad {
  GstObject		object;

  gpointer		element_private;

  GstPadTemplate	*padtemplate;	/* the template for this pad */

  gpointer _gst_reserved[GST_PADDING];
};

struct _GstPadClass {
  GstObjectClass parent_class;

  gpointer _gst_reserved[GST_PADDING];
};

typedef enum {
  GST_RPAD_IN_GETFUNC = GST_PAD_FLAG_LAST,
  GST_RPAD_IN_CHAINFUNC,
  GST_RPAD_FLAG_LAST = GST_PAD_FLAG_LAST + 4
} GstRealPadFlags;

struct _GstRealPad {
  GstPad			 pad;

  /* the pad capabilities */
  GstCaps			*caps;
  GstPadFixateFunction		 appfixatefunc;
  GstCaps			*appfilter;
  GstPadGetCapsFunction		getcapsfunc;
  GstPadFixateFunction		 fixatefunc;

  GstPadDirection		 direction;

  GstPadLinkFunction		 linkfunc;
  GstPadUnlinkFunction		 unlinkfunc;
  GstRealPad			*peer;

  gpointer			 sched_private;

  /* data transport functions */
  GstAction *			action;
  GstPadEventFunction		eventhandler;

  GList				*ghostpads;

  /* query/convert/formats functions */
  GstPadConvertFunction		 convertfunc;
  GstPadQueryFunction		 queryfunc;
  GstPadFormatsFunction		 formatsfunc;
  GstPadQueryTypeFunction	 querytypefunc;
  GstPadIntLinkFunction		 intlinkfunc;

  GstPadBufferAllocFunction        bufferallocfunc;

  GstPadLink                    *link;
  GstCaps			*explicit_caps;

  gpointer _gst_reserved[GST_PADDING];
};

struct _GstRealPadClass {
  GstPadClass	parent_class;

  /* signal callbacks */
  void		(*caps_nego_failed)	(GstPad *pad, GstCaps *caps);

  void		(*linked)		(GstPad *pad, GstPad *peer);
  void		(*unlinked)		(GstPad *pad, GstPad *peer);
  GstPadFixateFunction		 appfixatefunc;

  gpointer _gst_reserved[GST_PADDING];
};

struct _GstGhostPad {
  GstPad pad;

  GstRealPad *realpad;

  gpointer _gst_reserved[GST_PADDING];
};

struct _GstGhostPadClass {
  GstPadClass parent_class;

  gpointer _gst_reserved[GST_PADDING];
};


/***** helper macros *****/
/* GstPad */
#define GST_PAD_NAME(pad)		(GST_OBJECT_NAME(pad))
#define GST_PAD_PARENT(pad)		((GstElement *)(GST_OBJECT_PARENT(pad)))
#define GST_PAD_ELEMENT_PRIVATE(pad)	(((GstPad *)(pad))->element_private)
#define GST_PAD_PAD_TEMPLATE(pad)	(((GstPad *)(pad))->padtemplate)

/* GstRealPad */
#define GST_RPAD_DIRECTION(pad)		(((GstRealPad *)(pad))->direction)
#define GST_RPAD_CAPS(pad)		(((GstRealPad *)(pad))->caps)
#define GST_RPAD_APPFILTER(pad)		(((GstRealPad *)(pad))->appfilter)
#define GST_RPAD_PEER(pad)		(((GstRealPad *)(pad))->peer)
#define GST_RPAD_EVENTHANDLER(pad)	(((GstRealPad *)(pad))->eventhandler)
#define GST_RPAD_CONVERTFUNC(pad)	(((GstRealPad *)(pad))->convertfunc)
#define GST_RPAD_QUERYFUNC(pad)		(((GstRealPad *)(pad))->queryfunc)
#define GST_RPAD_INTLINKFUNC(pad)	(((GstRealPad *)(pad))->intlinkfunc)

#define GST_RPAD_LINKFUNC(pad)		(((GstRealPad *)(pad))->linkfunc)
#define GST_RPAD_UNLINKFUNC(pad)	(((GstRealPad *)(pad))->unlinkfunc)
#define GST_RPAD_GETCAPSFUNC(pad)	(((GstRealPad *)(pad))->getcapsfunc)
#define GST_RPAD_FIXATEFUNC(pad)	(((GstRealPad *)(pad))->fixatefunc)
#define GST_RPAD_BUFFERALLOCFUNC(pad)	(((GstRealPad *)(pad))->bufferallocfunc)
#define GST_RPAD_LINK(pad)	        (((GstRealPad *)(pad))->link)
#define GST_RPAD_EXPLICIT_CAPS(pad)	(((GstRealPad *)(pad))->explicit_caps)

/* GstGhostPad */
#define GST_GPAD_REALPAD(pad)		(((GstGhostPad *)(pad))->realpad)

/* Generic */
#define GST_PAD_REALIZE(pad)		(GST_IS_REAL_PAD(pad) ? ((GstRealPad *)(pad)) : GST_GPAD_REALPAD(pad))
#define GST_PAD_DIRECTION(pad)		GST_RPAD_DIRECTION(GST_PAD_REALIZE(pad))
#define GST_PAD_CAPS(pad)		(gst_pad_get_negotiated_caps(GST_PAD (pad)))
#define GST_PAD_PEER(pad)		GST_PAD(GST_RPAD_PEER(GST_PAD_REALIZE(pad)))

/* Some check functions (unused?) */
#define GST_PAD_IS_LINKED(pad)		(GST_PAD_PEER(pad) != NULL)
#define GST_PAD_IS_NEGOTIATING(pad)	(GST_FLAG_IS_SET (pad, GST_PAD_NEGOTIATING))
#define GST_PAD_IS_DISPATCHING(pad)	(GST_FLAG_IS_SET (pad, GST_PAD_DISPATCHING))
#define GST_PAD_IS_SRC(pad)		(GST_PAD_DIRECTION(pad) == GST_PAD_SRC)
#define GST_PAD_IS_SINK(pad)		(GST_PAD_DIRECTION(pad) == GST_PAD_SINK)

/***** PadTemplate *****/
#define GST_TYPE_PAD_TEMPLATE		(gst_pad_template_get_type ())
#define GST_PAD_TEMPLATE(obj)		(G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_PAD_TEMPLATE,GstPadTemplate))
#define GST_PAD_TEMPLATE_CLASS(klass)	(G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_PAD_TEMPLATE,GstPadTemplateClass))
#define GST_IS_PAD_TEMPLATE(obj)	(G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_PAD_TEMPLATE))
#define GST_IS_PAD_TEMPLATE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_PAD_TEMPLATE))

typedef enum {
  GST_PAD_ALWAYS,
  GST_PAD_SOMETIMES,
  GST_PAD_REQUEST
} GstPadPresence;

#define GST_PAD_TEMPLATE_NAME_TEMPLATE(templ)	(((GstPadTemplate *)(templ))->name_template)
#define GST_PAD_TEMPLATE_DIRECTION(templ)	(((GstPadTemplate *)(templ))->direction)
#define GST_PAD_TEMPLATE_PRESENCE(templ)	(((GstPadTemplate *)(templ))->presence)
#define GST_PAD_TEMPLATE_CAPS(templ)		(((GstPadTemplate *)(templ))->caps)

typedef enum {
  GST_PAD_TEMPLATE_FIXED	= GST_OBJECT_FLAG_LAST,

  GST_PAD_TEMPLATE_FLAG_LAST	= GST_OBJECT_FLAG_LAST + 4
} GstPadTemplateFlags;

#define GST_PAD_TEMPLATE_IS_FIXED(templ)	(GST_FLAG_IS_SET(templ, GST_PAD_TEMPLATE_FIXED))

struct _GstPadTemplate {
  GstObject	   object;

  gchar           *name_template;
  GstPadDirection  direction;
  GstPadPresence   presence;
  GstCaps	  *caps;

  gpointer _gst_reserved[GST_PADDING];
};

struct _GstPadTemplateClass {
  GstObjectClass   parent_class;

  /* signal callbacks */
  void (*pad_created)	(GstPadTemplate *templ, GstPad *pad);

  gpointer _gst_reserved[GST_PADDING];
};

struct _GstStaticPadTemplate {
  gchar           *name_template;
  GstPadDirection  direction;
  GstPadPresence   presence;
  GstStaticCaps   static_caps;
};

#define GST_STATIC_PAD_TEMPLATE(padname, dir, pres, caps) \
  { \
  /* name_template */    padname, \
  /* direction */        dir, \
  /* presence */         pres, \
  /* caps */             caps \
  }


GType			gst_pad_get_type			(void);
GType			gst_real_pad_get_type			(void);
GType			gst_ghost_pad_get_type			(void);

/* creating pads */
GstPad*			gst_pad_new				(const gchar *name, GstPadDirection direction);
GstPad*			gst_pad_new_from_template		(GstPadTemplate *templ, const gchar *name);
GstPad*			gst_pad_custom_new			(GType type, const gchar *name, GstPadDirection direction);
GstPad*			gst_pad_custom_new_from_template	(GType type, GstPadTemplate *templ, const gchar *name);

void			gst_pad_set_name			(GstPad *pad, const gchar *name);
G_CONST_RETURN gchar*	gst_pad_get_name			(GstPad *pad);

GstPadDirection		gst_pad_get_direction			(GstPad *pad);

void			gst_real_pad_set_active			(GstRealPad *pad, gboolean active);
gboolean		gst_real_pad_is_active			(GstRealPad *pad);
void			gst_real_pad_set_initially_active     	(GstRealPad *pad, gboolean active);

void			gst_pad_set_element_private		(GstPad *pad, gpointer priv);
gpointer		gst_pad_get_element_private		(GstPad *pad);

void			gst_pad_set_parent			(GstPad *pad, GstElement *parent);
GstElement*		gst_pad_get_parent			(GstPad *pad);
GstElement*		gst_pad_get_real_parent			(GstPad *pad);

GstScheduler*		gst_pad_get_scheduler			(GstPad *pad);

void			gst_pad_add_ghost_pad			(GstPad *pad, GstPad *ghostpad);
void			gst_pad_remove_ghost_pad		(GstPad *pad, GstPad *ghostpad);
GList*			gst_pad_get_ghost_pad_list		(GstPad *pad);

GstPadTemplate*		gst_pad_get_pad_template		(GstPad *pad);

void			gst_pad_set_bufferalloc_function		(GstPad *pad, GstPadBufferAllocFunction bufalloc);
GstBuffer*		gst_pad_alloc_buffer			(GstPad *pad, guint64 offset, gint size);

/* data passing setup functions */
void			gst_src_pad_set_action_handler		(GstPad *pad, GstActionSrcPadFunc func);
void			gst_sink_pad_set_action_handler		(GstPad *pad, GstActionSinkPadFunc func);
void			gst_pad_set_event_function		(GstPad *pad, GstPadEventFunction event);

/* pad links */
void			gst_pad_set_link_function		(GstPad *pad, GstPadLinkFunction link);
gboolean                gst_pad_can_link			(GstPad *srcpad, GstPad *sinkpad);
gboolean                gst_pad_can_link_filtered		(GstPad *srcpad, GstPad *sinkpad, const GstCaps *filtercaps);
void			gst_pad_set_unlink_function		(GstPad *pad, GstPadUnlinkFunction unlink);

gboolean                gst_pad_link				(GstPad *srcpad, GstPad *sinkpad);
gboolean                gst_pad_link_filtered			(GstPad *srcpad, GstPad *sinkpad, const GstCaps *filtercaps);
void			gst_pad_unlink				(GstPad *srcpad, GstPad *sinkpad);
gboolean		gst_pad_is_linked			(GstPad *pad);

GstPad*			gst_pad_get_peer			(GstPad *pad);

/* capsnego functions */
G_CONST_RETURN GstCaps*	gst_pad_get_negotiated_caps		(GstPad *pad);
gboolean	        gst_pad_is_negotiated		        (GstPad *pad);
GstCaps*		gst_pad_get_caps			(GstPad *pad);
G_CONST_RETURN GstCaps*	gst_pad_get_pad_template_caps		(GstPad *pad);
GstPadLinkReturn	gst_pad_try_set_caps			(GstPad *pad, const GstCaps *caps);
GstPadLinkReturn	gst_pad_try_set_caps_nonfixed		(GstPad *pad, const GstCaps *caps);
gboolean		gst_pad_check_compatibility		(GstPad *srcpad, GstPad *sinkpad);

void			gst_pad_set_getcaps_function		(GstPad *pad, GstPadGetCapsFunction getcaps);
void			gst_pad_set_fixate_function		(GstPad *pad, GstPadFixateFunction fixate);
GstCaps *	        gst_pad_proxy_getcaps			(GstPad *pad);
GstPadLinkReturn        gst_pad_proxy_pad_link                  (GstPad *pad, const GstCaps *caps);
GstCaps *               gst_pad_proxy_fixate                    (GstPad *pad, const GstCaps *caps);
#ifndef GST_DISABLE_DEPRECATED
GstPadLinkReturn	gst_pad_proxy_link			(GstPad *pad, const GstCaps *caps);
#endif
gboolean		gst_pad_set_explicit_caps		(GstPad *pad, const GstCaps *caps);
void			gst_pad_use_explicit_caps		(GstPad *pad);
gboolean		gst_pad_relink_filtered			(GstPad *srcpad, GstPad *sinkpad, const GstCaps *filtercaps);
#ifndef GST_DISABLE_DEPRECATED
gboolean		gst_pad_perform_negotiate		(GstPad *srcpad, GstPad *sinkpad);
#endif
GstPadLinkReturn	gst_pad_renegotiate			(GstPad *pad);
void			gst_pad_unnegotiate			(GstPad *pad);
gboolean		gst_pad_try_relink_filtered		(GstPad *srcpad, GstPad *sinkpad, const GstCaps *filtercaps);
GstCaps*		gst_pad_get_allowed_caps		(GstPad *pad);
void                    gst_pad_caps_change_notify              (GstPad *pad);

gboolean		gst_pad_recover_caps_error		(GstPad *pad, const GstCaps *allowed);

/* data passing functions */
void			gst_pad_push				(GstPad *pad, GstData *data);
gboolean		gst_pad_send_event			(GstPad *pad, GstEvent *event);
gboolean		gst_pad_event_default			(GstPad *pad, GstEvent *event);

/* convert/query functions */
void			gst_pad_set_convert_function		(GstPad *pad, GstPadConvertFunction convert);
gboolean		gst_pad_convert				(GstPad *pad,
								 GstFormat src_format,  gint64  src_value,
								 GstFormat *dest_format, gint64 *dest_value);
gboolean		gst_pad_convert_default			(GstPad *pad,
								 GstFormat src_format,  gint64  src_value,
					                         GstFormat *dest_format, gint64 *dest_value);

void			gst_pad_set_query_function		(GstPad *pad, GstPadQueryFunction query);
gboolean		gst_pad_query				(GstPad *pad, GstQueryType type,
								 GstFormat *format, gint64 *value);
gboolean		gst_pad_query_default			(GstPad *pad, GstQueryType type,
								 GstFormat *format, gint64 *value);

void			gst_pad_set_internal_link_function	(GstPad *pad, GstPadIntLinkFunction intlink);
GList*			gst_pad_get_internal_links		(GstPad *pad);
GList*			gst_pad_get_internal_links_default	(GstPad *pad);

/* misc helper functions */
gboolean		gst_pad_dispatcher			(GstPad *pad, GstPadDispatcherFunction dispatch,
								 gpointer data);

#ifndef GST_DISABLE_LOADSAVE
void			gst_pad_load_and_link			(xmlNodePtr self, GstObject *parent);
#endif


/* ghostpads */
GstPad*			gst_ghost_pad_new			(const gchar *name, GstPad *pad);


/* templates and factories */
GType			gst_pad_template_get_type		(void);

GstPadTemplate*		gst_pad_template_new			(const gchar *name_template,
								 GstPadDirection direction, GstPadPresence presence,
								 GstCaps *caps);

GstPadTemplate *	gst_static_pad_template_get             (GstStaticPadTemplate *pad_template);
const GstCaps*		gst_pad_template_get_caps		(GstPadTemplate *templ);
#ifndef GST_DISABLE_DEPRECATED
const GstCaps*		gst_pad_template_get_caps_by_name	(GstPadTemplate *templ, const gchar *name);
#endif

#ifndef GST_DISABLE_LOADSAVE
xmlNodePtr              gst_ghost_pad_save_thyself		(GstPad *pad,
								 xmlNodePtr parent);
#endif

/* for schedulers only */
void			gst_pad_call_chain_function		(GstPad *pad, GstData *data);
GstData *		gst_pad_call_get_function		(GstPad *pad);

G_END_DECLS

#endif /* __GST_PAD_H__ */