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gstreamer/gst/gstpad.h
Andy Wingo c1d34b8acf tests/network-clock.scm: Commentary update. 
Original commit message from CVS:
2005-07-01  Andy Wingo  <wingo@pobox.com>

* tests/network-clock.scm: Commentary update.

* gst/elements/gstidentity.c (PROP_DUPLICATE): Gone daddy gone.
Didn't really make sense, not implementable with basetransform,
etc.
(gst_identity_transform): Unref inbuf via make_writable. Feeble
attempt at implementing the sync property, needs an unlock method.

* gst/base/gstbasetransform.c (gst_base_transform_transform_caps):
New func, by default returns the same caps (the identity
transformation).
(gst_base_transform_getcaps): Uses transform_caps to return
something sensible.
(gst_base_transform_setcaps): Complicated logic to get caps on
both pads, even if they are different, and to call set_caps once
for every time both pads get their caps set.
(gst_base_transform_handle_buffer): Give the ref to the transform
function. Allows in-place modification of the buffer.

* gst/base/gstbasetransform.h (transform_caps): New class method.
Given caps on one side, what can I do on the other.
(set_caps): Take two caps, one for each side of the element.

* gst/gstpad.h:
* gst/gstpad.c (gst_pad_fixate_caps): Change prototype to modify
caps in place. This is safe because we can check the mutability of
the caps, and a good idea because fixate functions are just called
as a matter of last resort. (Not actually implemented.)
(gst_pad_set_caps): If the caps we're setting is actually the same
as the existing pad caps, just update the pointer without calling
setcaps. Assert that caps is either NULL or fixed, as per the
docs.

* gst/gstghostpad.c: Update for fixate changes.
2005-07-01 16:46:59 +00:00

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/* 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/gstquery.h>
#include <gst/gstqueryutils.h>
#include <gst/gsttask.h>
G_BEGIN_DECLS
GST_EXPORT GType _gst_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_PAD) /* necessary? */
#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))
#define GST_PAD_CAST(obj) ((GstPad*)(obj))
/* why are these in gsttypes, again? */
/*typedef struct _GstPad GstPad;*/
/*typedef struct _GstPadClass GstPadClass;*/
/*typedef struct _GstPadTemplate GstPadTemplate;*/
/*typedef struct _GstPadTemplateClass GstPadTemplateClass;*/
typedef struct _GstStaticPadTemplate GstStaticPadTemplate;
typedef enum {
GST_PAD_LINK_NOSCHED = -5, /* pads cannot cooperate in scheduling */
GST_PAD_LINK_NOFORMAT = -4, /* pads do not have common format */
GST_PAD_LINK_REFUSED = -3, /* refused for some reason */
GST_PAD_LINK_WRONG_DIRECTION = -2, /* pads have wrong direction */
GST_PAD_LINK_WAS_LINKED = -1, /* pad was already linked */
GST_PAD_LINK_OK = 0, /* link ok */
} GstPadLinkReturn;
#define GST_PAD_LINK_FAILED(ret) ((ret) < GST_PAD_LINK_OK)
#define GST_PAD_LINK_SUCCESSFUL(ret) ((ret) >= GST_PAD_LINK_OK)
typedef enum {
GST_FLOW_OK = 0, /* data passing was ok */
GST_FLOW_RESEND = 1, /* resend buffer, possibly with new caps */
GST_FLOW_ERROR = -1, /* some (fatal) error occured */
GST_FLOW_NOT_LINKED = -2, /* pad is not linked */
GST_FLOW_NOT_NEGOTIATED = -3, /* pad is not negotiated */
GST_FLOW_WRONG_STATE = -4, /* pad is in wrong state */
GST_FLOW_UNEXPECTED = -5, /* did not expect anything, this is not fatal */
GST_FLOW_NOT_SUPPORTED = -6 /* function not supported */
} GstFlowReturn;
typedef enum {
GST_ACTIVATE_NONE,
GST_ACTIVATE_PUSH,
GST_ACTIVATE_PULL,
} GstActivateMode;
#define GST_PAD_MODE_ACTIVATE(mode) ((mode) != GST_ACTIVATE_NONE)
/* pad states */
typedef gboolean (*GstPadActivateFunction) (GstPad *pad);
typedef gboolean (*GstPadActivateModeFunction) (GstPad *pad, gboolean active);
/* data passing */
typedef GstFlowReturn (*GstPadChainFunction) (GstPad *pad, GstBuffer *buffer);
typedef GstFlowReturn (*GstPadGetRangeFunction) (GstPad *pad, guint64 offset,
guint length, GstBuffer **buffer);
typedef gboolean (*GstPadEventFunction) (GstPad *pad, GstEvent *event);
/* deprecate me, check range should use seeking query */
typedef gboolean (*GstPadCheckGetRangeFunction) (GstPad *pad);
/* internal links */
typedef GList* (*GstPadIntLinkFunction) (GstPad *pad);
/* generic query function */
typedef const GstQueryType* (*GstPadQueryTypeFunction) (GstPad *pad);
typedef gboolean (*GstPadQueryFunction) (GstPad *pad, GstQuery *query);
/* linking */
typedef GstPadLinkReturn (*GstPadLinkFunction) (GstPad *pad, GstPad *peer);
typedef void (*GstPadUnlinkFunction) (GstPad *pad);
/* caps nego */
typedef GstCaps* (*GstPadGetCapsFunction) (GstPad *pad);
typedef gboolean (*GstPadSetCapsFunction) (GstPad *pad, GstCaps *caps);
typedef gboolean (*GstPadAcceptCapsFunction) (GstPad *pad, GstCaps *caps);
typedef void (*GstPadFixateCapsFunction) (GstPad *pad, GstCaps *caps);
typedef GstFlowReturn (*GstPadBufferAllocFunction) (GstPad *pad, guint64 offset, guint size,
GstCaps *caps, GstBuffer **buf);
/* misc */
typedef gboolean (*GstPadDispatcherFunction) (GstPad *pad, gpointer data);
typedef void (*GstPadBlockCallback) (GstPad *pad, gboolean blocked, gpointer user_data);
typedef enum {
GST_PAD_UNKNOWN,
GST_PAD_SRC,
GST_PAD_SINK
} GstPadDirection;
typedef enum {
GST_PAD_BLOCKED = GST_OBJECT_FLAG_LAST,
GST_PAD_FLUSHING,
GST_PAD_IN_GETCAPS,
GST_PAD_IN_SETCAPS,
GST_PAD_FLAG_LAST = GST_OBJECT_FLAG_LAST + 8
} GstPadFlags;
struct _GstPad {
GstObject object;
gpointer element_private;
GstPadTemplate *padtemplate;
/* direction cannot change after creating the pad */
GstPadDirection direction;
/*< public >*/ /* with STREAM_LOCK */
/* streaming rec_lock */
GStaticRecMutex *stream_rec_lock;
GstTask *task;
/*< public >*/ /* with PREROLL_LOCK */
GMutex *preroll_lock;
GCond *preroll_cond;
/*< public >*/ /* with LOCK */
/* block cond, mutex is from the object */
GCond *block_cond;
GstPadBlockCallback block_callback;
gpointer block_data;
/* the pad capabilities */
GstCaps *caps;
GstPadGetCapsFunction getcapsfunc;
GstPadSetCapsFunction setcapsfunc;
GstPadAcceptCapsFunction acceptcapsfunc;
GstPadFixateCapsFunction fixatecapsfunc;
GstPadActivateFunction activatefunc;
GstPadActivateModeFunction activatepushfunc;
GstPadActivateModeFunction activatepullfunc;
/* pad link */
GstPadLinkFunction linkfunc;
GstPadUnlinkFunction unlinkfunc;
GstPad *peer;
gpointer sched_private;
/* data transport functions */
GstPadChainFunction chainfunc;
GstPadCheckGetRangeFunction checkgetrangefunc;
GstPadGetRangeFunction getrangefunc;
GstPadEventFunction eventfunc;
GstActivateMode mode;
/* generic query method */
GstPadQueryTypeFunction querytypefunc;
GstPadQueryFunction queryfunc;
/* internal links */
GstPadIntLinkFunction intlinkfunc;
GstPadBufferAllocFunction bufferallocfunc;
/* whether to emit signals for have-data. counts number
* of handlers attached. */
gint do_buffer_signals;
gint do_event_signals;
/*< private >*/
gpointer _gst_reserved[GST_PADDING];
};
struct _GstPadClass {
GstObjectClass parent_class;
/* signal callbacks */
void (*linked) (GstPad *pad, GstPad *peer);
void (*unlinked) (GstPad *pad, GstPad *peer);
void (*request_link) (GstPad *pad);
gboolean (*have_data) (GstPad *pad, GstMiniObject *data);
/*< private >*/
gpointer _gst_reserved[GST_PADDING];
};
/***** helper macros *****/
/* GstPad */
#define GST_PAD_NAME(pad) (GST_OBJECT_NAME(pad))
#define GST_PAD_PARENT(pad) (GST_ELEMENT_CAST(GST_OBJECT_PARENT(pad)))
#define GST_PAD_ELEMENT_PRIVATE(pad) (GST_PAD_CAST(pad)->element_private)
#define GST_PAD_PAD_TEMPLATE(pad) (GST_PAD_CAST(pad)->padtemplate)
#define GST_PAD_DIRECTION(pad) (GST_PAD_CAST(pad)->direction)
#define GST_PAD_TASK(pad) (GST_PAD_CAST(pad)->task)
#define GST_PAD_ACTIVATE_MODE(pad) (GST_PAD_CAST(pad)->mode)
#define GST_PAD_ACTIVATEFUNC(pad) (GST_PAD_CAST(pad)->activatefunc)
#define GST_PAD_ACTIVATEPUSHFUNC(pad) (GST_PAD_CAST(pad)->activatepushfunc)
#define GST_PAD_ACTIVATEPULLFUNC(pad) (GST_PAD_CAST(pad)->activatepullfunc)
#define GST_PAD_CHAINFUNC(pad) (GST_PAD_CAST(pad)->chainfunc)
#define GST_PAD_CHECKGETRANGEFUNC(pad) (GST_PAD_CAST(pad)->checkgetrangefunc)
#define GST_PAD_GETRANGEFUNC(pad) (GST_PAD_CAST(pad)->getrangefunc)
#define GST_PAD_EVENTFUNC(pad) (GST_PAD_CAST(pad)->eventfunc)
#define GST_PAD_QUERYTYPEFUNC(pad) (GST_PAD_CAST(pad)->querytypefunc)
#define GST_PAD_QUERYFUNC(pad) (GST_PAD_CAST(pad)->queryfunc)
#define GST_PAD_INTLINKFUNC(pad) (GST_PAD_CAST(pad)->intlinkfunc)
#define GST_PAD_PEER(pad) (GST_PAD_CAST(pad)->peer)
#define GST_PAD_LINKFUNC(pad) (GST_PAD_CAST(pad)->linkfunc)
#define GST_PAD_UNLINKFUNC(pad) (GST_PAD_CAST(pad)->unlinkfunc)
#define GST_PAD_CAPS(pad) (GST_PAD_CAST(pad)->caps)
#define GST_PAD_GETCAPSFUNC(pad) (GST_PAD_CAST(pad)->getcapsfunc)
#define GST_PAD_SETCAPSFUNC(pad) (GST_PAD_CAST(pad)->setcapsfunc)
#define GST_PAD_ACCEPTCAPSFUNC(pad) (GST_PAD_CAST(pad)->acceptcapsfunc)
#define GST_PAD_FIXATECAPSFUNC(pad) (GST_PAD_CAST(pad)->fixatecapsfunc)
#define GST_PAD_BUFFERALLOCFUNC(pad) (GST_PAD_CAST(pad)->bufferallocfunc)
#define GST_PAD_DO_BUFFER_SIGNALS(pad) (GST_PAD_CAST(pad)->do_buffer_signals)
#define GST_PAD_DO_EVENT_SIGNALS(pad) (GST_PAD_CAST(pad)->do_event_signals)
#define GST_PAD_IS_LINKED(pad) (GST_PAD_PEER(pad) != NULL)
#define GST_PAD_IS_BLOCKED(pad) (GST_FLAG_IS_SET (pad, GST_PAD_BLOCKED))
#define GST_PAD_IS_FLUSHING(pad) (GST_FLAG_IS_SET (pad, GST_PAD_FLUSHING))
#define GST_PAD_IS_IN_GETCAPS(pad) (GST_FLAG_IS_SET (pad, GST_PAD_IN_GETCAPS))
#define GST_PAD_IS_IN_SETCAPS(pad) (GST_FLAG_IS_SET (pad, GST_PAD_IN_SETCAPS))
#define GST_PAD_IS_USABLE(pad) (GST_PAD_IS_LINKED (pad) && \
!GST_PAD_IS_FLUSHING(pad) && !GST_PAD_IS_FLUSHING(GST_PAD_PEER (pad)))
#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)
#define GST_PAD_SET_FLUSHING(pad) (GST_FLAG_SET (pad, GST_PAD_FLUSHING))
#define GST_PAD_UNSET_FLUSHING(pad) (GST_FLAG_UNSET (pad, GST_PAD_FLUSHING))
#define GST_STREAM_GET_LOCK(pad) (GST_PAD_CAST(pad)->stream_rec_lock)
#define GST_STREAM_LOCK(pad) (g_static_rec_mutex_lock(GST_STREAM_GET_LOCK(pad)))
#define GST_STREAM_TRYLOCK(pad) (g_static_rec_mutex_trylock(GST_STREAM_GET_LOCK(pad)))
#define GST_STREAM_UNLOCK(pad) (g_static_rec_mutex_unlock(GST_STREAM_GET_LOCK(pad)))
#define GST_STREAM_UNLOCK_FULL(pad) (g_static_rec_mutex_unlock_full(GST_STREAM_GET_LOCK(pad)))
#define GST_STREAM_LOCK_FULL(pad,t) (g_static_rec_mutex_lock_full(GST_STREAM_GET_LOCK(pad), t))
#define GST_PREROLL_GET_LOCK(pad) (GST_PAD_CAST(pad)->preroll_lock)
#define GST_PREROLL_LOCK(pad) (g_mutex_lock(GST_PREROLL_GET_LOCK(pad)))
#define GST_PREROLL_TRYLOCK(pad) (g_mutex_trylock(GST_PREROLL_GET_LOCK(pad)))
#define GST_PREROLL_UNLOCK(pad) (g_mutex_unlock(GST_PREROLL_GET_LOCK(pad)))
#define GST_PREROLL_GET_COND(pad) (GST_PAD_CAST(pad)->preroll_cond)
#define GST_PREROLL_WAIT(pad) g_cond_wait (GST_PREROLL_GET_COND (pad), GST_PREROLL_GET_LOCK (pad))
#define GST_PREROLL_TIMED_WAIT(pad, timeval) g_cond_timed_wait (GST_PREROLL_GET_COND (pad), GST_PREROLL_GET_LOCK (pad),\
timeval)
#define GST_PREROLL_SIGNAL(pad) g_cond_signal (GST_PREROLL_GET_COND (pad));
#define GST_PREROLL_BROADCAST(pad) g_cond_broadcast (GST_PREROLL_GET_COND (pad));
#define GST_PAD_BLOCK_GET_COND(pad) (GST_PAD_CAST(pad)->block_cond)
#define GST_PAD_BLOCK_WAIT(pad) (g_cond_wait(GST_PAD_BLOCK_GET_COND (pad), GST_GET_LOCK (pad)))
#define GST_PAD_BLOCK_SIGNAL(pad) (g_cond_signal(GST_PAD_BLOCK_GET_COND (pad)))
/***** 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);
/* creating pads */
GstPad* gst_pad_new (const gchar *name, GstPadDirection direction);
GstPad* gst_pad_new_from_template (GstPadTemplate *templ, const gchar *name);
#define gst_pad_get_name(pad) gst_object_get_name (GST_OBJECT_CAST (pad))
GstElement* gst_pad_get_parent (GstPad *pad);
GstPadDirection gst_pad_get_direction (GstPad *pad);
gboolean gst_pad_set_active (GstPad *pad, gboolean active);
gboolean gst_pad_is_active (GstPad *pad);
gboolean gst_pad_activate_pull (GstPad *pad, gboolean active);
gboolean gst_pad_activate_push (GstPad *pad, gboolean active);
gboolean gst_pad_set_blocked (GstPad *pad, gboolean blocked);
gboolean gst_pad_set_blocked_async (GstPad *pad, gboolean blocked,
GstPadBlockCallback callback, gpointer user_data);
gboolean gst_pad_is_blocked (GstPad *pad);
void gst_pad_set_element_private (GstPad *pad, gpointer priv);
gpointer gst_pad_get_element_private (GstPad *pad);
GstPadTemplate* gst_pad_get_pad_template (GstPad *pad);
void gst_pad_set_bufferalloc_function (GstPad *pad, GstPadBufferAllocFunction bufalloc);
GstFlowReturn gst_pad_alloc_buffer (GstPad *pad, guint64 offset, gint size,
GstCaps *caps, GstBuffer **buf);
/* data passing setup functions */
void gst_pad_set_activate_function (GstPad *pad, GstPadActivateFunction activate);
void gst_pad_set_activatepull_function (GstPad *pad, GstPadActivateModeFunction activatepull);
void gst_pad_set_activatepush_function (GstPad *pad, GstPadActivateModeFunction activatepush);
void gst_pad_set_chain_function (GstPad *pad, GstPadChainFunction chain);
void gst_pad_set_getrange_function (GstPad *pad, GstPadGetRangeFunction get);
void gst_pad_set_checkgetrange_function (GstPad *pad, GstPadCheckGetRangeFunction check);
void gst_pad_set_event_function (GstPad *pad, GstPadEventFunction event);
/* pad links */
void gst_pad_set_link_function (GstPad *pad, GstPadLinkFunction link);
void gst_pad_set_unlink_function (GstPad *pad, GstPadUnlinkFunction unlink);
GstPadLinkReturn gst_pad_link (GstPad *srcpad, GstPad *sinkpad);
gboolean gst_pad_unlink (GstPad *srcpad, GstPad *sinkpad);
gboolean gst_pad_is_linked (GstPad *pad);
GstPad* gst_pad_get_peer (GstPad *pad);
/* capsnego functions */
void gst_pad_set_getcaps_function (GstPad *pad, GstPadGetCapsFunction getcaps);
void gst_pad_set_acceptcaps_function (GstPad *pad, GstPadAcceptCapsFunction acceptcaps);
void gst_pad_set_fixatecaps_function (GstPad *pad, GstPadFixateCapsFunction fixatecaps);
void gst_pad_set_setcaps_function (GstPad *pad, GstPadSetCapsFunction setcaps);
G_CONST_RETURN GstCaps* gst_pad_get_pad_template_caps (GstPad *pad);
/* capsnego function for connected/unconnected pads */
GstCaps * gst_pad_get_caps (GstPad * pad);
void gst_pad_fixate_caps (GstPad * pad, GstCaps *caps);
gboolean gst_pad_accept_caps (GstPad * pad, GstCaps *caps);
gboolean gst_pad_set_caps (GstPad * pad, GstCaps *caps);
GstCaps * gst_pad_peer_get_caps (GstPad * pad);
gboolean gst_pad_peer_accept_caps (GstPad * pad, GstCaps *caps);
/* capsnego for connected pads */
GstCaps * gst_pad_get_allowed_caps (GstPad * srcpad);
GstCaps * gst_pad_get_negotiated_caps (GstPad * pad);
/* data passing functions to peer */
GstFlowReturn gst_pad_push (GstPad *pad, GstBuffer *buffer);
gboolean gst_pad_check_pull_range (GstPad *pad);
GstFlowReturn gst_pad_pull_range (GstPad *pad, guint64 offset, guint size,
GstBuffer **buffer);
gboolean gst_pad_push_event (GstPad *pad, GstEvent *event);
gboolean gst_pad_event_default (GstPad *pad, GstEvent *event);
/* data passing functions on pad */
GstFlowReturn gst_pad_chain (GstPad *pad, GstBuffer *buffer);
GstFlowReturn gst_pad_get_range (GstPad *pad, guint64 offset, guint size,
GstBuffer **buffer);
gboolean gst_pad_send_event (GstPad *pad, GstEvent *event);
/* pad tasks */
gboolean gst_pad_start_task (GstPad *pad, GstTaskFunction func,
gpointer data);
gboolean gst_pad_pause_task (GstPad *pad);
gboolean gst_pad_stop_task (GstPad *pad);
/* internal links */
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);
/* generic query function */
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, GstQuery *query);
void gst_pad_set_query_function (GstPad *pad, GstPadQueryFunction query);
gboolean gst_pad_query_default (GstPad *pad, GstQuery *query);
/* 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
/* 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);
GstCaps* gst_static_pad_template_get_caps (GstStaticPadTemplate *templ);
GstCaps* gst_pad_template_get_caps (GstPadTemplate *templ);
G_END_DECLS
#endif /* __GST_PAD_H__ */
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