/* 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/gstbuffer.h>
#include <gst/gstcaps.h>
#include <gst/gstevent.h>
#include <gst/gstprobe.h>
#include <gst/gstquery.h>


G_BEGIN_DECLS extern GType _gst_pad_type;
extern GType _gst_real_pad_type;
extern 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 _GstPad GstPad; */
/*typedef struct _GstPadClass GstPadClass;*/
typedef struct _GstRealPad GstRealPad;
typedef struct _GstRealPadClass GstRealPadClass;
typedef struct _GstGhostPad GstGhostPad;
typedef struct _GstGhostPadClass GstGhostPadClass;

/*typedef struct _GstPadTemplate GstPadTemplate;*/
/*typedef struct _GstPadTemplateClass GstPadTemplateClass;*/
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 GstEventMask *(*GstPadEventMaskFunction) (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_DISABLED = GST_OBJECT_FLAG_LAST,
  GST_PAD_NEGOTIATING,

  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];
};

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 */
  GstPadChainFunction chainfunc;
  GstPadChainFunction chainhandler;
  GstPadGetFunction getfunc;
  GstPadGetFunction gethandler;
  GstPadEventFunction eventfunc;
  GstPadEventFunction eventhandler;
  GstPadEventMaskFunction eventmaskfunc;

  GList *ghostpads;

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

  GstPadBufferAllocFunction bufferallocfunc;

  GstProbeDispatcher probedisp;

  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_CHAINFUNC(pad)		(((GstRealPad *)(pad))->chainfunc)
#define GST_RPAD_CHAINHANDLER(pad)	(((GstRealPad *)(pad))->chainhandler)
#define GST_RPAD_GETFUNC(pad)		(((GstRealPad *)(pad))->getfunc)
#define GST_RPAD_GETHANDLER(pad)	(((GstRealPad *)(pad))->gethandler)
#define GST_RPAD_EVENTFUNC(pad)		(((GstRealPad *)(pad))->eventfunc)
#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_FORMATSFUNC(pad)	(((GstRealPad *)(pad))->formatsfunc)
#define GST_RPAD_QUERYTYPEFUNC(pad)	(((GstRealPad *)(pad))->querytypefunc)
#define GST_RPAD_EVENTMASKFUNC(pad)	(((GstRealPad *)(pad))->eventmaskfunc)

#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_ACTIVE(pad)		(!GST_FLAG_IS_SET(GST_PAD_REALIZE(pad), GST_PAD_DISABLED))
#define GST_PAD_IS_NEGOTIATING(pad)	(GST_FLAG_IS_SET (pad, GST_PAD_NEGOTIATING))
#define GST_PAD_IS_USABLE(pad)		(GST_PAD_IS_LINKED (pad) && \
		                         GST_PAD_IS_ACTIVE(pad) && GST_PAD_IS_ACTIVE(GST_PAD_PEER (pad)))
#define GST_PAD_CAN_PULL(pad)		(GST_IS_REAL_PAD(pad) && GST_REAL_PAD(pad)->gethandler != NULL)
#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_pad_set_active (GstPad * pad, gboolean active);
gboolean gst_pad_is_active (GstPad * pad);

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 bufferalloc);
GstBuffer *gst_pad_alloc_buffer (GstPad * pad, guint64 offset, gint size);

/* data passing setup functions */
void gst_pad_set_chain_function (GstPad * pad, GstPadChainFunction chain);
void gst_pad_set_get_function (GstPad * pad, GstPadGetFunction get);
void gst_pad_set_event_function (GstPad * pad, GstPadEventFunction event);
void gst_pad_set_event_mask_function (GstPad * pad,
    GstPadEventMaskFunction mask_func);
G_CONST_RETURN GstEventMask *gst_pad_get_event_masks (GstPad * pad);
G_CONST_RETURN GstEventMask *gst_pad_get_event_masks_default (GstPad * pad);

/* 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);
GstData *gst_pad_pull (GstPad * pad);
gboolean gst_pad_send_event (GstPad * pad, GstEvent * event);
gboolean gst_pad_event_default (GstPad * pad, GstEvent * event);
GstPad *gst_pad_selectv (GList * padlist);
GstPad *gst_pad_select (GstPad * pad, ...);
GstPad *gst_pad_select_valist (GstPad * pad, va_list varargs);


/* convert/query/format functions */
void gst_pad_set_formats_function (GstPad * pad, GstPadFormatsFunction formats);
G_CONST_RETURN GstFormat *gst_pad_get_formats (GstPad * pad);
G_CONST_RETURN GstFormat *gst_pad_get_formats_default (GstPad * pad);

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);
void gst_pad_set_query_type_function (GstPad * pad,
    GstPadQueryTypeFunction type_func);
G_CONST_RETURN GstQueryType *gst_pad_get_query_types (GstPad * pad);
G_CONST_RETURN GstQueryType *gst_pad_get_query_types_default (GstPad * pad);
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);

#define			gst_pad_add_probe(pad, probe) \
			(gst_probe_dispatcher_add_probe (&(GST_REAL_PAD (pad)->probedisp), probe))
#define			gst_pad_remove_probe(pad, probe) \
			(gst_probe_dispatcher_remove_probe (&(GST_REAL_PAD (pad)->probedisp), probe))

#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 * templ);
const GstCaps *gst_pad_template_get_caps (GstPadTemplate * templ);
const GstCaps *gst_pad_template_get_caps_by_name (GstPadTemplate * templ,
    const gchar * name);

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

G_END_DECLS
#endif /* __GST_PAD_H__ */