/* GStreamer * Copyright (C) 1999,2000 Erik Walthinsen * 2000 Wim Taymans * * 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 #include #include #include #include #include #include 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)) typedef struct _GstPad GstPad; typedef struct _GstPadClass GstPadClass; /** * GstPadLinkReturn: * @GST_PAD_LINK_OK : link succeeded * @GST_PAD_LINK_WRONG_HIERARCHY: pads have no common grandparent * @GST_PAD_LINK_WAS_LINKED : pad was already linked * @GST_PAD_LINK_WRONG_DIRECTION: pads have wrong direction * @GST_PAD_LINK_NOFORMAT : pads do not have common format * @GST_PAD_LINK_NOSCHED : pads cannot cooperate in scheduling * @GST_PAD_LINK_REFUSED : refused for some reason */ typedef enum { GST_PAD_LINK_OK = 0, GST_PAD_LINK_WRONG_HIERARCHY = -1, GST_PAD_LINK_WAS_LINKED = -2, GST_PAD_LINK_WRONG_DIRECTION = -3, GST_PAD_LINK_NOFORMAT = -4, GST_PAD_LINK_NOSCHED = -5, GST_PAD_LINK_REFUSED = -6, } GstPadLinkReturn; /** * GST_PAD_LINK_FAILED: * @ret: the #GstPadLinkReturn value * * Macro to test if the given #GstPadLinkReturn value indicates a failed * negotiation step (REFUSED/DELAYED). */ #define GST_PAD_LINK_FAILED(ret) ((ret) < GST_PAD_LINK_OK) /** * GST_PAD_LINK_SUCCESSFUL: * @ret: the #GstPadLinkReturn value * * Macro to test if the given #GstPadLinkReturn value indicates a successfull * negotiation step (OK/DONE). */ #define GST_PAD_LINK_SUCCESSFUL(ret) ((ret) >= GST_PAD_LINK_OK) typedef enum { GST_FLOW_RESEND = 1, /* resend buffer, possibly with new caps */ GST_FLOW_OK = 0, /* data passing was ok */ /* expected failures */ GST_FLOW_NOT_LINKED = -1, /* pad is not linked */ GST_FLOW_WRONG_STATE = -2, /* pad is in wrong state */ /* error cases */ GST_FLOW_UNEXPECTED = -3, /* did not expect anything, like after EOS */ GST_FLOW_NOT_NEGOTIATED = -4, /* pad is not negotiated */ GST_FLOW_ERROR = -5, /* some (fatal) error occured */ GST_FLOW_NOT_SUPPORTED = -6 /* function not supported */ } GstFlowReturn; #define GST_FLOW_IS_FATAL(ret) ((ret) <= GST_FLOW_UNEXPECTED) 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 */ /** * GstPadChainFunction: * @pad: the #GstPad that performed the chain. * @buffer: the #GstBuffer that is chained. * * A function that will be called when chaining buffers. * * Returns: GST_FLOW_OK for success */ typedef GstFlowReturn (*GstPadChainFunction) (GstPad *pad, GstBuffer *buffer); typedef GstFlowReturn (*GstPadGetRangeFunction) (GstPad *pad, guint64 offset, guint length, GstBuffer **buffer); /** * GstPadEventFunction: * @pad: the #GstPad to handle the event. * @event: the #GstEvent to handle. * * Function signature to handle an event for the pad. * * Returns: TRUE if the pad could handle the event. */ typedef gboolean (*GstPadEventFunction) (GstPad *pad, GstEvent *event); /* deprecate me, check range should use seeking query */ typedef gboolean (*GstPadCheckGetRangeFunction) (GstPad *pad); /* internal links */ /** * GstPadIntLinkFunction: * @pad: The #GstPad to query. * * The signature of the internal pad link function. * * Returns: a newly allocated #GList of pads that are linked to the given pad on * the inside of the parent element. * The caller must call g_list_free() on it after use. * */ typedef GList* (*GstPadIntLinkFunction) (GstPad *pad); /* generic query function */ /** * GstPadQueryTypeFunction: * @pad: a #GstPad to query * * The signature of the query types function. * * Returns: an array of query types */ typedef const GstQueryType* (*GstPadQueryTypeFunction) (GstPad *pad); /** * GstPadQueryFunction: * @pad: the #GstPad to query. * @query: the #GstQuery object to execute * * The signature of the query function. * * Returns: TRUE if the query could be performed. */ typedef gboolean (*GstPadQueryFunction) (GstPad *pad, GstQuery *query); /* linking */ /** * GstPadLinkFunction * @pad: the #GstPad that is linked. * @peer: the peer #GstPad of the link * * Function signature to handle a new link on the pad. * * Returns: the result of the link with the specified peer. */ typedef GstPadLinkReturn (*GstPadLinkFunction) (GstPad *pad, GstPad *peer); /** * GstPadUnlinkFunction * @pad: the #GstPad that is linked. * * Function signature to handle a unlinking the pad prom its peer. */ typedef void (*GstPadUnlinkFunction) (GstPad *pad); /* caps nego */ /** * GstPadGetCapsFunction: * @pad: the #GstPad to get the capabilities of. * * Returns a copy of the capabilities of the specified pad. By default this * function will return the pad template capabilities, but can optionally * be overridden. * * Returns: a newly allocated copy #GstCaps of the pad. */ 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 */ /** * GstPadDispatcherFunction: * @pad: the #GstPad that is dispatched. * @data: the gpointer to optional user data. * * A dispatcher function is called for all internally linked pads, see * gst_pad_dispatcher(). * * Returns: TRUE if the dispatching procedure has to be stopped. */ typedef gboolean (*GstPadDispatcherFunction) (GstPad *pad, gpointer data); /** * GstPadBlockCallback: * @pad: the #GstPad that is blockend or unblocked. * @blocked: blocking state for the pad * @user_data: the gpointer to optional user data. * * Callback used by gst_pad_set_blocked_async(). Gets called when the blocking * operation succeeds. */ typedef void (*GstPadBlockCallback) (GstPad *pad, gboolean blocked, gpointer user_data); /** * GstPadDirection: * @GST_PAD_UNKNOWN: direction is unknown. * @GST_PAD_SRC: the pad is a source pad. * @GST_PAD_SINK: the pad is a sink pad. * * The direction of a pad. */ typedef enum { GST_PAD_UNKNOWN, GST_PAD_SRC, GST_PAD_SINK } GstPadDirection; /** * GstPadFlags: * @GST_PAD_BLOCKED: is dataflow on a pad blocked * @GST_PAD_FLUSHING: is pad empying buffers * @GST_PAD_IN_GETCAPS: GstPadGetCapsFunction() is running now * @GST_PAD_IN_SETCAPS: GstPadSetCapsFunction() is running now * @GST_PAD_FLAG_LAST: offset to define more flags * * Pad state flags */ typedef enum { GST_PAD_BLOCKED = GST_OBJECT_FLAG_LAST, GST_PAD_FLUSHING, GST_PAD_IN_GETCAPS, GST_PAD_IN_SETCAPS, /* padding */ GST_PAD_FLAG_LAST = GST_OBJECT_FLAG_LAST + 8 } GstPadFlags; /* FIXME: this awful circular dependency need to be resolved properly (see padtemplate.h) */ typedef struct _GstPadTemplate GstPadTemplate; 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))) /* FIXME: this awful circular dependency need to be resolved properly (see padtemplate.h) */ #include 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); /** * gst_pad_get_name: * @pad: the pad to get the name from * * Returns a copy of the name of the pad. * * Returns: the name of the pad. g_free() after usage. * * MT safe. */ #define gst_pad_get_name(pad) gst_object_get_name (GST_OBJECT_CAST (pad)) /** * gst_pad_get_parent: * @pad: the pad to get the parent of * * Returns the parent of @pad. This function increases the refcount * of the parent object so you should gst_object_unref() it after usage. * * Returns: parent of the object, this can be NULL if the pad has no * parent. unref after usage. * * MT safe. */ #define gst_pad_get_parent(pad) gst_object_get_parent (GST_OBJECT_CAST (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 G_END_DECLS #endif /* __GST_PAD_H__ */