2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2000 Wim Taymans <wim.taymans@chello.be>
5 * gstpad.h: Header for GstPad object
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
17 * You should have received a copy of the GNU Library General Public
18 * License along with this library; if not, write to the
19 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
20 * Boston, MA 02110-1301, USA.
27 #include <gst/gstconfig.h>
29 typedef struct _GstPad GstPad;
30 typedef struct _GstPadPrivate GstPadPrivate;
31 typedef struct _GstPadClass GstPadClass;
32 typedef struct _GstPadProbeInfo GstPadProbeInfo;
36 * @GST_PAD_UNKNOWN: direction is unknown.
37 * @GST_PAD_SRC: the pad is a source pad.
38 * @GST_PAD_SINK: the pad is a sink pad.
40 * The direction of a pad.
50 * @GST_PAD_MODE_NONE: Pad will not handle dataflow
51 * @GST_PAD_MODE_PUSH: Pad handles dataflow in downstream push mode
52 * @GST_PAD_MODE_PULL: Pad handles dataflow in upstream pull mode
54 * The status of a GstPad. After activating a pad, which usually happens when the
55 * parent element goes from READY to PAUSED, the GstPadMode defines if the
56 * pad operates in push or pull mode.
66 const gchar * gst_pad_mode_get_name (GstPadMode mode);
68 #include <gst/gstobject.h>
69 #include <gst/gstbuffer.h>
70 #include <gst/gstbufferlist.h>
71 #include <gst/gstcaps.h>
72 #include <gst/gstpadtemplate.h>
73 #include <gst/gstevent.h>
74 #include <gst/gstquery.h>
75 #include <gst/gsttask.h>
82 #define GST_TYPE_PAD (gst_pad_get_type ())
83 #define GST_IS_PAD(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_PAD))
84 #define GST_IS_PAD_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_PAD))
85 #define GST_PAD(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_PAD, GstPad))
86 #define GST_PAD_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_PAD, GstPadClass))
87 #define GST_PAD_CAST(obj) ((GstPad*)(obj))
93 * @GST_PAD_LINK_OK : link succeeded
94 * @GST_PAD_LINK_WRONG_HIERARCHY: pads have no common grandparent
95 * @GST_PAD_LINK_WAS_LINKED : pad was already linked
96 * @GST_PAD_LINK_WRONG_DIRECTION: pads have wrong direction
97 * @GST_PAD_LINK_NOFORMAT : pads do not have common format
98 * @GST_PAD_LINK_NOSCHED : pads cannot cooperate in scheduling
99 * @GST_PAD_LINK_REFUSED : refused for some reason
101 * Result values from gst_pad_link and friends.
105 GST_PAD_LINK_WRONG_HIERARCHY = -1,
106 GST_PAD_LINK_WAS_LINKED = -2,
107 GST_PAD_LINK_WRONG_DIRECTION = -3,
108 GST_PAD_LINK_NOFORMAT = -4,
109 GST_PAD_LINK_NOSCHED = -5,
110 GST_PAD_LINK_REFUSED = -6
114 * GST_PAD_LINK_FAILED:
115 * @ret: the #GstPadLinkReturn value
117 * Macro to test if the given #GstPadLinkReturn value indicates a failed
120 #define GST_PAD_LINK_FAILED(ret) ((ret) < GST_PAD_LINK_OK)
123 * GST_PAD_LINK_SUCCESSFUL:
124 * @ret: the #GstPadLinkReturn value
126 * Macro to test if the given #GstPadLinkReturn value indicates a successful
129 #define GST_PAD_LINK_SUCCESSFUL(ret) ((ret) >= GST_PAD_LINK_OK)
133 * @GST_FLOW_OK: Data passing was ok.
134 * @GST_FLOW_NOT_LINKED: Pad is not linked.
135 * @GST_FLOW_FLUSHING: Pad is flushing.
136 * @GST_FLOW_EOS: Pad is EOS.
137 * @GST_FLOW_NOT_NEGOTIATED: Pad is not negotiated.
138 * @GST_FLOW_ERROR: Some (fatal) error occurred. Element generating
139 * this error should post an error message with more
141 * @GST_FLOW_NOT_SUPPORTED: This operation is not supported.
142 * @GST_FLOW_CUSTOM_SUCCESS: Elements can use values starting from
143 * this (and higher) to define custom success
145 * @GST_FLOW_CUSTOM_SUCCESS_1: Pre-defined custom success code (define your
146 * custom success code to this to avoid compiler
148 * @GST_FLOW_CUSTOM_SUCCESS_2: Pre-defined custom success code.
149 * @GST_FLOW_CUSTOM_ERROR: Elements can use values starting from
150 * this (and lower) to define custom error codes.
151 * @GST_FLOW_CUSTOM_ERROR_1: Pre-defined custom error code (define your
152 * custom error code to this to avoid compiler
154 * @GST_FLOW_CUSTOM_ERROR_2: Pre-defined custom error code.
156 * The result of passing data to a pad.
158 * Note that the custom return values should not be exposed outside of the
162 /* custom success starts here */
163 GST_FLOW_CUSTOM_SUCCESS_2 = 102,
164 GST_FLOW_CUSTOM_SUCCESS_1 = 101,
165 GST_FLOW_CUSTOM_SUCCESS = 100,
167 /* core predefined */
169 /* expected failures */
170 GST_FLOW_NOT_LINKED = -1,
171 GST_FLOW_FLUSHING = -2,
174 GST_FLOW_NOT_NEGOTIATED = -4,
176 GST_FLOW_NOT_SUPPORTED = -6,
178 /* custom error starts here */
179 GST_FLOW_CUSTOM_ERROR = -100,
180 GST_FLOW_CUSTOM_ERROR_1 = -101,
181 GST_FLOW_CUSTOM_ERROR_2 = -102
184 const gchar* gst_flow_get_name (GstFlowReturn ret);
185 GQuark gst_flow_to_quark (GstFlowReturn ret);
186 const gchar* gst_pad_link_get_name (GstPadLinkReturn ret);
190 * @GST_PAD_LINK_CHECK_NOTHING: Don't check hierarchy or caps compatibility.
191 * @GST_PAD_LINK_CHECK_HIERARCHY: Check the pads have same parents/grandparents.
192 * Could be omitted if it is already known that the two elements that own the
193 * pads are in the same bin.
194 * @GST_PAD_LINK_CHECK_TEMPLATE_CAPS: Check if the pads are compatible by using
195 * their template caps. This is much faster than @GST_PAD_LINK_CHECK_CAPS, but
196 * would be unsafe e.g. if one pad has %GST_CAPS_ANY.
197 * @GST_PAD_LINK_CHECK_CAPS: Check if the pads are compatible by comparing the
198 * caps returned by gst_pad_query_caps().
199 * @GST_PAD_LINK_CHECK_NO_RECONFIGURE: Disables pushing a reconfigure event when pads are
201 * @GST_PAD_LINK_CHECK_DEFAULT: The default checks done when linking
202 * pads (i.e. the ones used by gst_pad_link()).
204 * The amount of checking to be done when linking pads. @GST_PAD_LINK_CHECK_CAPS
205 * and @GST_PAD_LINK_CHECK_TEMPLATE_CAPS are mutually exclusive. If both are
206 * specified, expensive but safe @GST_PAD_LINK_CHECK_CAPS are performed.
209 * Only disable some of the checks if you are 100% certain you know the link
210 * will not fail because of hierarchy/caps compatibility failures. If uncertain,
211 * use the default checks (%GST_PAD_LINK_CHECK_DEFAULT) or the regular methods
212 * for linking the pads.
217 GST_PAD_LINK_CHECK_NOTHING = 0,
218 GST_PAD_LINK_CHECK_HIERARCHY = 1 << 0,
219 GST_PAD_LINK_CHECK_TEMPLATE_CAPS = 1 << 1,
220 GST_PAD_LINK_CHECK_CAPS = 1 << 2,
223 /* Not really checks, more like flags
224 * Added here to avoid creating a new gst_pad_link_variant */
225 GST_PAD_LINK_CHECK_NO_RECONFIGURE = 1 << 3,
227 GST_PAD_LINK_CHECK_DEFAULT = GST_PAD_LINK_CHECK_HIERARCHY | GST_PAD_LINK_CHECK_CAPS
232 * GstPadActivateFunction:
234 * @parent: the parent of @pad
236 * This function is called when the pad is activated during the element
237 * READY to PAUSED state change. By default this function will call the
238 * activate function that puts the pad in push mode but elements can
239 * override this function to activate the pad in pull mode if they wish.
241 * Returns: %TRUE if the pad could be activated.
243 typedef gboolean (*GstPadActivateFunction) (GstPad *pad, GstObject *parent);
245 * GstPadActivateModeFunction:
247 * @parent: the parent of @pad
248 * @mode: the requested activation mode of @pad
249 * @active: activate or deactivate the pad.
251 * The prototype of the push and pull activate functions.
253 * Returns: %TRUE if the pad could be activated or deactivated.
255 typedef gboolean (*GstPadActivateModeFunction) (GstPad *pad, GstObject *parent,
256 GstPadMode mode, gboolean active);
261 * GstPadChainFunction:
262 * @pad: the sink #GstPad that performed the chain.
263 * @parent: (allow-none): the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT
264 * flag is set, @parent is guaranteed to be not-%NULL and remain valid
265 * during the execution of this function.
266 * @buffer: (transfer full): the #GstBuffer that is chained, not %NULL.
268 * A function that will be called on sinkpads when chaining buffers.
269 * The function typically processes the data contained in the buffer and
270 * either consumes the data or passes it on to the internally linked pad(s).
272 * The implementer of this function receives a refcount to @buffer and should
273 * gst_buffer_unref() when the buffer is no longer needed.
275 * When a chain function detects an error in the data stream, it must post an
276 * error on the bus and return an appropriate #GstFlowReturn value.
278 * Returns: #GST_FLOW_OK for success
280 typedef GstFlowReturn (*GstPadChainFunction) (GstPad *pad, GstObject *parent,
284 * GstPadChainListFunction:
285 * @pad: the sink #GstPad that performed the chain.
286 * @parent: (allow-none): the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT
287 * flag is set, @parent is guaranteed to be not-%NULL and remain valid
288 * during the execution of this function.
289 * @list: (transfer full): the #GstBufferList that is chained, not %NULL.
291 * A function that will be called on sinkpads when chaining buffer lists.
292 * The function typically processes the data contained in the buffer list and
293 * either consumes the data or passes it on to the internally linked pad(s).
295 * The implementer of this function receives a refcount to @list and
296 * should gst_buffer_list_unref() when the list is no longer needed.
298 * When a chainlist function detects an error in the data stream, it must
299 * post an error on the bus and return an appropriate #GstFlowReturn value.
301 * Returns: #GST_FLOW_OK for success
303 typedef GstFlowReturn (*GstPadChainListFunction) (GstPad *pad, GstObject *parent,
304 GstBufferList *list);
307 * GstPadGetRangeFunction:
308 * @pad: the src #GstPad to perform the getrange on.
309 * @parent: (allow-none): the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT
310 * flag is set, @parent is guaranteed to be not-%NULL and remain valid
311 * during the execution of this function.
312 * @offset: the offset of the range
313 * @length: the length of the range
314 * @buffer: a memory location to hold the result buffer, cannot be %NULL.
316 * This function will be called on source pads when a peer element
317 * request a buffer at the specified @offset and @length. If this function
318 * returns #GST_FLOW_OK, the result buffer will be stored in @buffer. The
319 * contents of @buffer is invalid for any other return value.
321 * This function is installed on a source pad with
322 * gst_pad_set_getrange_function() and can only be called on source pads after
323 * they are successfully activated with gst_pad_activate_mode() with the
324 * #GST_PAD_MODE_PULL.
326 * @offset and @length are always given in byte units. @offset must normally be a value
327 * between 0 and the length in bytes of the data available on @pad. The
328 * length (duration in bytes) can be retrieved with a #GST_QUERY_DURATION or with a
329 * #GST_QUERY_SEEKING.
331 * Any @offset larger or equal than the length will make the function return
332 * #GST_FLOW_EOS, which corresponds to EOS. In this case @buffer does not
333 * contain a valid buffer.
335 * The buffer size of @buffer will only be smaller than @length when @offset is
336 * near the end of the stream. In all other cases, the size of @buffer must be
337 * exactly the requested size.
339 * It is allowed to call this function with a 0 @length and valid @offset, in
340 * which case @buffer will contain a 0-sized buffer and the function returns
343 * When this function is called with a -1 @offset, the sequentially next buffer
344 * of length @length in the stream is returned.
346 * When this function is called with a -1 @length, a buffer with a default
347 * optimal length is returned in @buffer. The length might depend on the value
350 * Returns: #GST_FLOW_OK for success and a valid buffer in @buffer. Any other
351 * return value leaves @buffer undefined.
353 typedef GstFlowReturn (*GstPadGetRangeFunction) (GstPad *pad, GstObject *parent,
354 guint64 offset, guint length,
358 * GstPadEventFunction:
359 * @pad: the #GstPad to handle the event.
360 * @parent: (allow-none): the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT
361 * flag is set, @parent is guaranteed to be not-%NULL and remain valid
362 * during the execution of this function.
363 * @event: (transfer full): the #GstEvent to handle.
365 * Function signature to handle an event for the pad.
367 * Returns: %TRUE if the pad could handle the event.
369 typedef gboolean (*GstPadEventFunction) (GstPad *pad, GstObject *parent,
373 * GstPadEventFullFunction:
374 * @pad: the #GstPad to handle the event.
375 * @parent: (allow-none): the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT
376 * flag is set, @parent is guaranteed to be not-%NULL and remain valid
377 * during the execution of this function.
378 * @event: (transfer full): the #GstEvent to handle.
380 * Function signature to handle an event for the pad.
382 * This variant is for specific elements that will take into account the
383 * last downstream flow return (from a pad push), in which case they can
386 * Returns: %GST_FLOW_OK if the event was handled properly, or any other
387 * #GstFlowReturn dependent on downstream state.
391 typedef GstFlowReturn (*GstPadEventFullFunction) (GstPad *pad, GstObject *parent,
397 * GstPadIterIntLinkFunction:
398 * @pad: The #GstPad to query.
399 * @parent: (allow-none): the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT
400 * flag is set, @parent is guaranteed to be not-%NULL and remain valid
401 * during the execution of this function.
403 * The signature of the internal pad link iterator function.
405 * Returns: a new #GstIterator that will iterate over all pads that are
406 * linked to the given pad on the inside of the parent element.
408 * the caller must call gst_iterator_free() after usage.
410 typedef GstIterator* (*GstPadIterIntLinkFunction) (GstPad *pad, GstObject *parent);
412 /* generic query function */
414 * GstPadQueryFunction:
415 * @pad: the #GstPad to query.
416 * @parent: (allow-none): the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT
417 * flag is set, @parent is guaranteed to be not-%NULL and remain valid
418 * during the execution of this function.
419 * @query: the #GstQuery object to execute
421 * The signature of the query function.
423 * Returns: %TRUE if the query could be performed.
425 typedef gboolean (*GstPadQueryFunction) (GstPad *pad, GstObject *parent,
431 * GstPadLinkFunction:
432 * @pad: the #GstPad that is linked.
433 * @parent: (allow-none): the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT
434 * flag is set, @parent is guaranteed to be not-%NULL and remain valid
435 * during the execution of this function.
436 * @peer: the peer #GstPad of the link
438 * Function signature to handle a new link on the pad.
440 * Returns: the result of the link with the specified peer.
442 typedef GstPadLinkReturn (*GstPadLinkFunction) (GstPad *pad, GstObject *parent, GstPad *peer);
444 * GstPadUnlinkFunction:
445 * @pad: the #GstPad that is linked.
446 * @parent: (allow-none): the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT
447 * flag is set, @parent is guaranteed to be not-%NULL and remain valid
448 * during the execution of this function.
450 * Function signature to handle a unlinking the pad prom its peer.
452 typedef void (*GstPadUnlinkFunction) (GstPad *pad, GstObject *parent);
457 * GstPadForwardFunction:
458 * @pad: the #GstPad that is forwarded.
459 * @user_data: the gpointer to optional user data.
461 * A forward function is called for all internally linked pads, see
464 * Returns: %TRUE if the dispatching procedure has to be stopped.
466 typedef gboolean (*GstPadForwardFunction) (GstPad *pad, gpointer user_data);
470 * @GST_PAD_PROBE_TYPE_INVALID: invalid probe type
471 * @GST_PAD_PROBE_TYPE_IDLE: probe idle pads and block while the callback is called
472 * @GST_PAD_PROBE_TYPE_BLOCK: probe and block pads
473 * @GST_PAD_PROBE_TYPE_BUFFER: probe buffers
474 * @GST_PAD_PROBE_TYPE_BUFFER_LIST: probe buffer lists
475 * @GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM: probe downstream events
476 * @GST_PAD_PROBE_TYPE_EVENT_UPSTREAM: probe upstream events
477 * @GST_PAD_PROBE_TYPE_EVENT_FLUSH: probe flush events. This probe has to be
478 * explicitly enabled and is not included in the
479 * @@GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM or
480 * @@GST_PAD_PROBE_TYPE_EVENT_UPSTREAM probe types.
481 * @GST_PAD_PROBE_TYPE_QUERY_DOWNSTREAM: probe downstream queries
482 * @GST_PAD_PROBE_TYPE_QUERY_UPSTREAM: probe upstream queries
483 * @GST_PAD_PROBE_TYPE_PUSH: probe push
484 * @GST_PAD_PROBE_TYPE_PULL: probe pull
485 * @GST_PAD_PROBE_TYPE_BLOCKING: probe and block at the next opportunity, at data flow or when idle
486 * @GST_PAD_PROBE_TYPE_DATA_DOWNSTREAM: probe downstream data (buffers, buffer lists, and events)
487 * @GST_PAD_PROBE_TYPE_DATA_UPSTREAM: probe upstream data (events)
488 * @GST_PAD_PROBE_TYPE_DATA_BOTH: probe upstream and downstream data (buffers, buffer lists, and events)
489 * @GST_PAD_PROBE_TYPE_BLOCK_DOWNSTREAM: probe and block downstream data (buffers, buffer lists, and events)
490 * @GST_PAD_PROBE_TYPE_BLOCK_UPSTREAM: probe and block upstream data (events)
491 * @GST_PAD_PROBE_TYPE_EVENT_BOTH: probe upstream and downstream events
492 * @GST_PAD_PROBE_TYPE_QUERY_BOTH: probe upstream and downstream queries
493 * @GST_PAD_PROBE_TYPE_ALL_BOTH: probe upstream events and queries and downstream buffers, buffer lists, events and queries
494 * @GST_PAD_PROBE_TYPE_SCHEDULING: probe push and pull
496 * The different probing types that can occur. When either one of
497 * @GST_PAD_PROBE_TYPE_IDLE or @GST_PAD_PROBE_TYPE_BLOCK is used, the probe will be a
502 GST_PAD_PROBE_TYPE_INVALID = 0,
503 /* flags to control blocking */
504 GST_PAD_PROBE_TYPE_IDLE = (1 << 0),
505 GST_PAD_PROBE_TYPE_BLOCK = (1 << 1),
506 /* flags to select datatypes */
507 GST_PAD_PROBE_TYPE_BUFFER = (1 << 4),
508 GST_PAD_PROBE_TYPE_BUFFER_LIST = (1 << 5),
509 GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM = (1 << 6),
510 GST_PAD_PROBE_TYPE_EVENT_UPSTREAM = (1 << 7),
511 GST_PAD_PROBE_TYPE_EVENT_FLUSH = (1 << 8),
512 GST_PAD_PROBE_TYPE_QUERY_DOWNSTREAM = (1 << 9),
513 GST_PAD_PROBE_TYPE_QUERY_UPSTREAM = (1 << 10),
514 /* flags to select scheduling mode */
515 GST_PAD_PROBE_TYPE_PUSH = (1 << 12),
516 GST_PAD_PROBE_TYPE_PULL = (1 << 13),
518 /* flag combinations */
519 GST_PAD_PROBE_TYPE_BLOCKING = GST_PAD_PROBE_TYPE_IDLE | GST_PAD_PROBE_TYPE_BLOCK,
520 GST_PAD_PROBE_TYPE_DATA_DOWNSTREAM = GST_PAD_PROBE_TYPE_BUFFER | GST_PAD_PROBE_TYPE_BUFFER_LIST | GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM,
521 GST_PAD_PROBE_TYPE_DATA_UPSTREAM = GST_PAD_PROBE_TYPE_EVENT_UPSTREAM,
522 GST_PAD_PROBE_TYPE_DATA_BOTH = GST_PAD_PROBE_TYPE_DATA_DOWNSTREAM | GST_PAD_PROBE_TYPE_DATA_UPSTREAM,
523 GST_PAD_PROBE_TYPE_BLOCK_DOWNSTREAM = GST_PAD_PROBE_TYPE_BLOCK | GST_PAD_PROBE_TYPE_DATA_DOWNSTREAM,
524 GST_PAD_PROBE_TYPE_BLOCK_UPSTREAM = GST_PAD_PROBE_TYPE_BLOCK | GST_PAD_PROBE_TYPE_DATA_UPSTREAM,
525 GST_PAD_PROBE_TYPE_EVENT_BOTH = GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM | GST_PAD_PROBE_TYPE_EVENT_UPSTREAM,
526 GST_PAD_PROBE_TYPE_QUERY_BOTH = GST_PAD_PROBE_TYPE_QUERY_DOWNSTREAM | GST_PAD_PROBE_TYPE_QUERY_UPSTREAM,
527 GST_PAD_PROBE_TYPE_ALL_BOTH = GST_PAD_PROBE_TYPE_DATA_BOTH | GST_PAD_PROBE_TYPE_QUERY_BOTH,
528 GST_PAD_PROBE_TYPE_SCHEDULING = GST_PAD_PROBE_TYPE_PUSH | GST_PAD_PROBE_TYPE_PULL
534 * @GST_PAD_PROBE_OK: normal probe return value. This leaves the probe in
535 * place, and defers decisions about dropping or passing data to other
536 * probes, if any. If there are no other probes, the default behaviour
537 * for the probe type applies (block for blocking probes, and pass for
538 * non-blocking probes).
539 * @GST_PAD_PROBE_DROP: drop data in data probes. For push mode this means that
540 * the data item is not sent downstream. For pull mode, it means that
541 * the data item is not passed upstream. In both cases, no other probes
542 * are called for this item and #GST_FLOW_OK or %TRUE is returned to the
544 * @GST_PAD_PROBE_REMOVE: remove this probe.
545 * @GST_PAD_PROBE_PASS: pass the data item in the block probe and block on the
547 * @GST_PAD_PROBE_HANDLED: Data has been handled in the probe and will not be
548 * forwarded further. For events and buffers this is the same behaviour as
549 * @GST_PAD_PROBE_DROP (except that in this case you need to unref the buffer
550 * or event yourself). For queries it will also return %TRUE to the caller.
551 * The probe can also modify the #GstFlowReturn value by using the
552 * #GST_PAD_PROBE_INFO_FLOW_RETURN() accessor.
553 * Note that the resulting query must contain valid entries.
556 * Different return values for the #GstPadProbeCallback.
562 GST_PAD_PROBE_REMOVE,
564 GST_PAD_PROBE_HANDLED
570 * @type: the current probe type
571 * @id: the id of the probe
572 * @data: (allow-none): type specific data, check the @type field to know the
573 * datatype. This field can be %NULL.
574 * @offset: offset of pull probe, this field is valid when @type contains
575 * #GST_PAD_PROBE_TYPE_PULL
576 * @size: size of pull probe, this field is valid when @type contains
577 * #GST_PAD_PROBE_TYPE_PULL
579 * Info passed in the #GstPadProbeCallback.
581 struct _GstPadProbeInfo
583 GstPadProbeType type;
591 gpointer _gst_reserved[GST_PADDING];
593 GstFlowReturn flow_ret;
598 #define GST_PAD_PROBE_INFO_TYPE(d) ((d)->type)
599 #define GST_PAD_PROBE_INFO_ID(d) ((d)->id)
600 #define GST_PAD_PROBE_INFO_DATA(d) ((d)->data)
601 #define GST_PAD_PROBE_INFO_FLOW_RETURN(d) ((d)->ABI.abi.flow_ret)
603 #define GST_PAD_PROBE_INFO_BUFFER(d) GST_BUFFER_CAST(GST_PAD_PROBE_INFO_DATA(d))
604 #define GST_PAD_PROBE_INFO_BUFFER_LIST(d) GST_BUFFER_LIST_CAST(GST_PAD_PROBE_INFO_DATA(d))
605 #define GST_PAD_PROBE_INFO_EVENT(d) GST_EVENT_CAST(GST_PAD_PROBE_INFO_DATA(d))
606 #define GST_PAD_PROBE_INFO_QUERY(d) GST_QUERY_CAST(GST_PAD_PROBE_INFO_DATA(d))
608 #define GST_PAD_PROBE_INFO_OFFSET(d) ((d)->offset)
609 #define GST_PAD_PROBE_INFO_SIZE(d) ((d)->size)
611 GstEvent* gst_pad_probe_info_get_event (GstPadProbeInfo * info);
612 GstQuery* gst_pad_probe_info_get_query (GstPadProbeInfo * info);
613 GstBuffer* gst_pad_probe_info_get_buffer (GstPadProbeInfo * info);
614 GstBufferList* gst_pad_probe_info_get_buffer_list (GstPadProbeInfo * info);
617 * GstPadProbeCallback:
618 * @pad: the #GstPad that is blocked
619 * @info: #GstPadProbeInfo
620 * @user_data: the gpointer to optional user data.
622 * Callback used by gst_pad_add_probe(). Gets called to notify about the current
625 * The callback is allowed to modify the data pointer in @info.
627 * Returns: a #GstPadProbeReturn
629 typedef GstPadProbeReturn (*GstPadProbeCallback) (GstPad *pad, GstPadProbeInfo *info,
633 * GstPadStickyEventsForeachFunction:
635 * @event: (allow-none): a sticky #GstEvent.
636 * @user_data: the #gpointer to optional user data.
638 * Callback used by gst_pad_sticky_events_foreach().
640 * When this function returns %TRUE, the next event will be
641 * returned. When %FALSE is returned, gst_pad_sticky_events_foreach() will return.
643 * When @event is set to %NULL, the item will be removed from the list of sticky events.
644 * @event can be replaced by assigning a new reference to it.
645 * This function is responsible for unreffing the old event when
646 * removing or modifying.
648 * Returns: %TRUE if the iteration should continue
650 typedef gboolean (*GstPadStickyEventsForeachFunction) (GstPad *pad, GstEvent **event,
655 * @GST_PAD_FLAG_BLOCKED: is dataflow on a pad blocked
656 * @GST_PAD_FLAG_FLUSHING: is pad flushing
657 * @GST_PAD_FLAG_EOS: is pad in EOS state
658 * @GST_PAD_FLAG_BLOCKING: is pad currently blocking on a buffer or event
659 * @GST_PAD_FLAG_NEED_PARENT: ensure that there is a parent object before calling
660 * into the pad callbacks.
661 * @GST_PAD_FLAG_NEED_RECONFIGURE: the pad should be reconfigured/renegotiated.
662 * The flag has to be unset manually after
663 * reconfiguration happened.
664 * @GST_PAD_FLAG_PENDING_EVENTS: the pad has pending events
665 * @GST_PAD_FLAG_FIXED_CAPS: the pad is using fixed caps. This means that
666 * once the caps are set on the pad, the default caps query function
667 * will only return those caps.
668 * @GST_PAD_FLAG_PROXY_CAPS: the default event and query handler will forward
669 * all events and queries to the internally linked pads
670 * instead of discarding them.
671 * @GST_PAD_FLAG_PROXY_ALLOCATION: the default query handler will forward
672 * allocation queries to the internally linked pads
673 * instead of discarding them.
674 * @GST_PAD_FLAG_PROXY_SCHEDULING: the default query handler will forward
675 * scheduling queries to the internally linked pads
676 * instead of discarding them.
677 * @GST_PAD_FLAG_ACCEPT_INTERSECT: the default accept-caps handler will check
678 * it the caps intersect the query-caps result instead
679 * of checking for a subset. This is interesting for
680 * parsers that can accept incompletely specified caps.
681 * @GST_PAD_FLAG_ACCEPT_TEMPLATE: the default accept-caps handler will use
682 * the template pad caps instead of query caps to
683 * compare with the accept caps. Use this in combination
684 * with %GST_PAD_FLAG_ACCEPT_INTERSECT. (Since 1.6)
685 * @GST_PAD_FLAG_LAST: offset to define more flags
690 GST_PAD_FLAG_BLOCKED = (GST_OBJECT_FLAG_LAST << 0),
691 GST_PAD_FLAG_FLUSHING = (GST_OBJECT_FLAG_LAST << 1),
692 GST_PAD_FLAG_EOS = (GST_OBJECT_FLAG_LAST << 2),
693 GST_PAD_FLAG_BLOCKING = (GST_OBJECT_FLAG_LAST << 3),
694 GST_PAD_FLAG_NEED_PARENT = (GST_OBJECT_FLAG_LAST << 4),
695 GST_PAD_FLAG_NEED_RECONFIGURE = (GST_OBJECT_FLAG_LAST << 5),
696 GST_PAD_FLAG_PENDING_EVENTS = (GST_OBJECT_FLAG_LAST << 6),
697 GST_PAD_FLAG_FIXED_CAPS = (GST_OBJECT_FLAG_LAST << 7),
698 GST_PAD_FLAG_PROXY_CAPS = (GST_OBJECT_FLAG_LAST << 8),
699 GST_PAD_FLAG_PROXY_ALLOCATION = (GST_OBJECT_FLAG_LAST << 9),
700 GST_PAD_FLAG_PROXY_SCHEDULING = (GST_OBJECT_FLAG_LAST << 10),
701 GST_PAD_FLAG_ACCEPT_INTERSECT = (GST_OBJECT_FLAG_LAST << 11),
702 GST_PAD_FLAG_ACCEPT_TEMPLATE = (GST_OBJECT_FLAG_LAST << 12),
704 GST_PAD_FLAG_LAST = (GST_OBJECT_FLAG_LAST << 16)
709 * @element_private: private data owned by the parent element
710 * @padtemplate: padtemplate for this pad
711 * @direction: the direction of the pad, cannot change after creating
714 * The #GstPad structure. Use the functions to update the variables.
720 gpointer element_private;
722 GstPadTemplate *padtemplate;
724 GstPadDirection direction;
727 /* streaming rec_lock */
728 GRecMutex stream_rec_lock;
731 /* block cond, mutex is from the object */
736 GstPadActivateFunction activatefunc;
737 gpointer activatedata;
738 GDestroyNotify activatenotify;
739 GstPadActivateModeFunction activatemodefunc;
740 gpointer activatemodedata;
741 GDestroyNotify activatemodenotify;
745 GstPadLinkFunction linkfunc;
747 GDestroyNotify linknotify;
748 GstPadUnlinkFunction unlinkfunc;
750 GDestroyNotify unlinknotify;
752 /* data transport functions */
753 GstPadChainFunction chainfunc;
755 GDestroyNotify chainnotify;
756 GstPadChainListFunction chainlistfunc;
757 gpointer chainlistdata;
758 GDestroyNotify chainlistnotify;
759 GstPadGetRangeFunction getrangefunc;
760 gpointer getrangedata;
761 GDestroyNotify getrangenotify;
762 GstPadEventFunction eventfunc;
764 GDestroyNotify eventnotify;
769 /* generic query method */
770 GstPadQueryFunction queryfunc;
772 GDestroyNotify querynotify;
775 GstPadIterIntLinkFunction iterintlinkfunc;
776 gpointer iterintlinkdata;
777 GDestroyNotify iterintlinknotify;
779 /* counts number of probes attached. */
786 gpointer _gst_reserved[GST_PADDING];
788 GstFlowReturn last_flowret;
789 GstPadEventFullFunction eventfullfunc;
794 struct _GstPadClass {
795 GstObjectClass parent_class;
797 /* signal callbacks */
798 void (*linked) (GstPad *pad, GstPad *peer);
799 void (*unlinked) (GstPad *pad, GstPad *peer);
802 gpointer _gst_reserved[GST_PADDING];
806 /***** helper macros *****/
813 * Get name of the given pad.
814 * No locking is performed in this function, use gst_pad_get_name() instead.
816 #define GST_PAD_NAME(pad) (GST_OBJECT_NAME(pad))
821 * Get the @pad parent.
822 * No locking is performed in this function, use gst_pad_get_parent() instead.
824 #define GST_PAD_PARENT(pad) (GST_ELEMENT_CAST(GST_OBJECT_PARENT(pad)))
826 * GST_PAD_ELEMENT_PRIVATE:
829 * Get the private data of @pad, which is usually some pad- or stream-specific
830 * structure created by the element and set on the pad when creating it.
831 * No locking is performed in this function.
833 #define GST_PAD_ELEMENT_PRIVATE(pad) (GST_PAD_CAST(pad)->element_private)
835 * GST_PAD_PAD_TEMPLATE:
838 * Get the @pad #GstPadTemplate. It describes the possible media types
839 * a @pad or an element factory can handle.
841 #define GST_PAD_PAD_TEMPLATE(pad) (GST_PAD_CAST(pad)->padtemplate)
846 * Get the #GstPadDirection of the given @pad. Accessor macro, use
847 * gst_pad_get_direction() instead.
849 #define GST_PAD_DIRECTION(pad) (GST_PAD_CAST(pad)->direction)
854 * Get the #GstTask of @pad. Accessor macro used by GStreamer. Use the
855 * gst_pad_start_task(), gst_pad_stop_task() and gst_pad_pause_task()
858 #define GST_PAD_TASK(pad) (GST_PAD_CAST(pad)->task)
863 * Get the #GstPadMode of pad, which will be GST_PAD_MODE_NONE if the pad
864 * has not been activated yet, and otherwise either GST_PAD_MODE_PUSH or
865 * GST_PAD_MODE_PULL depending on which mode the pad was activated in.
867 #define GST_PAD_MODE(pad) (GST_PAD_CAST(pad)->mode)
869 * GST_PAD_ACTIVATEFUNC:
872 * Get the #GstPadActivateFunction from @pad.
874 #define GST_PAD_ACTIVATEFUNC(pad) (GST_PAD_CAST(pad)->activatefunc)
876 * GST_PAD_ACTIVATEMODEFUNC:
879 * Get the #GstPadActivateModeFunction from the given @pad.
881 #define GST_PAD_ACTIVATEMODEFUNC(pad) (GST_PAD_CAST(pad)->activatemodefunc)
886 * Get the #GstPadChainFunction from the given @pad.
888 #define GST_PAD_CHAINFUNC(pad) (GST_PAD_CAST(pad)->chainfunc)
890 * GST_PAD_CHAINLISTFUNC:
893 * Get the #GstPadChainListFunction from the given @pad.
895 #define GST_PAD_CHAINLISTFUNC(pad) (GST_PAD_CAST(pad)->chainlistfunc)
897 * GST_PAD_GETRANGEFUNC:
900 * Get the #GstPadGetRangeFunction from the given @pad.
902 #define GST_PAD_GETRANGEFUNC(pad) (GST_PAD_CAST(pad)->getrangefunc)
907 * Get the #GstPadEventFunction from the given @pad, which
908 * is the function that handles events on the pad. You can
909 * use this to set your own event handling function on a pad
910 * after you create it. If your element derives from a base
911 * class, use the base class's virtual functions instead.
913 #define GST_PAD_EVENTFUNC(pad) (GST_PAD_CAST(pad)->eventfunc)
915 * GST_PAD_EVENTFULLFUNC:
918 * Get the #GstPadEventFullFunction from the given @pad, which
919 * is the function that handles events on the pad. You can
920 * use this to set your own event handling function on a pad
921 * after you create it. If your element derives from a base
922 * class, use the base class's virtual functions instead.
926 #define GST_PAD_EVENTFULLFUNC(pad) (GST_PAD_CAST(pad)->ABI.abi.eventfullfunc)
931 * Get the #GstPadQueryFunction from @pad, which is the function
932 * that handles queries on the pad. You can use this to set your
933 * own query handling function on a pad after you create it. If your
934 * element derives from a base class, use the base class's virtual
937 #define GST_PAD_QUERYFUNC(pad) (GST_PAD_CAST(pad)->queryfunc)
939 * GST_PAD_ITERINTLINKFUNC:
942 * Get the #GstPadIterIntLinkFunction from the given @pad.
944 #define GST_PAD_ITERINTLINKFUNC(pad) (GST_PAD_CAST(pad)->iterintlinkfunc)
949 * Return the pad's peer member. This member is a pointer to the linked @pad.
950 * No locking is performed in this function, use gst_pad_get_peer() instead.
952 #define GST_PAD_PEER(pad) (GST_PAD_CAST(pad)->peer)
957 * Get the #GstPadLinkFunction for the given @pad.
959 #define GST_PAD_LINKFUNC(pad) (GST_PAD_CAST(pad)->linkfunc)
961 * GST_PAD_UNLINKFUNC:
964 * Get the #GstPadUnlinkFunction from the given @pad.
966 #define GST_PAD_UNLINKFUNC(pad) (GST_PAD_CAST(pad)->unlinkfunc)
971 * Returns: %TRUE if the pad is a source pad (i.e. produces data).
973 #define GST_PAD_IS_SRC(pad) (GST_PAD_DIRECTION(pad) == GST_PAD_SRC)
978 * Returns: %TRUE if the pad is a sink pad (i.e. consumes data).
980 #define GST_PAD_IS_SINK(pad) (GST_PAD_DIRECTION(pad) == GST_PAD_SINK)
985 * Returns: %TRUE if the pad is linked to another pad. Use gst_pad_is_linked()
988 #define GST_PAD_IS_LINKED(pad) (GST_PAD_PEER(pad) != NULL)
993 * Returns: %TRUE if the pad has been activated.
995 #define GST_PAD_IS_ACTIVE(pad) (GST_PAD_MODE(pad) != GST_PAD_MODE_NONE)
997 * GST_PAD_IS_BLOCKED:
1000 * Check if the dataflow on a @pad is blocked. Use gst_pad_is_blocked() instead.
1002 #define GST_PAD_IS_BLOCKED(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_BLOCKED))
1004 * GST_PAD_IS_BLOCKING:
1007 * Check if the @pad is currently blocking on a buffer or event. Use
1008 * gst_pad_is_blocking() instead.
1010 #define GST_PAD_IS_BLOCKING(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_BLOCKING))
1012 * GST_PAD_IS_FLUSHING:
1015 * Check if the given @pad is flushing.
1017 #define GST_PAD_IS_FLUSHING(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_FLUSHING))
1019 * GST_PAD_SET_FLUSHING:
1022 * Set the given @pad to flushing state, which means it will not accept any
1023 * more events, queries or buffers, and return GST_FLOW_FLUSHING if any buffers
1024 * are pushed on it. This usually happens when the pad is shut down or when
1025 * a flushing seek happens. This is used inside GStreamer when flush start/stop
1026 * events pass through pads, or when an element state is changed and pads are
1027 * activated or deactivated.
1029 #define GST_PAD_SET_FLUSHING(pad) (GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_FLUSHING))
1031 * GST_PAD_UNSET_FLUSHING:
1034 * Unset the flushing flag.
1036 #define GST_PAD_UNSET_FLUSHING(pad) (GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_FLUSHING))
1041 * Check if the @pad is in EOS state.
1043 #define GST_PAD_IS_EOS(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_EOS))
1045 * GST_PAD_NEEDS_RECONFIGURE:
1048 * Check if the @pad should be reconfigured/renegotiated.
1049 * The flag has to be unset manually after reconfiguration happened.
1050 * Use gst_pad_needs_reconfigure() or gst_pad_check_reconfigure() instead.
1052 #define GST_PAD_NEEDS_RECONFIGURE(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_NEED_RECONFIGURE))
1054 * GST_PAD_HAS_PENDING_EVENTS:
1057 * Check if the given @pad has pending events. This is used internally by
1060 #define GST_PAD_HAS_PENDING_EVENTS(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_PENDING_EVENTS))
1062 * GST_PAD_IS_FIXED_CAPS:
1065 * Check if the given @pad is using fixed caps, which means that
1066 * once the caps are set on the @pad, the caps query function will
1067 * only return those caps. See gst_pad_use_fixed_caps().
1069 #define GST_PAD_IS_FIXED_CAPS(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_FIXED_CAPS))
1071 * GST_PAD_NEEDS_PARENT:
1074 * Check if there is a parent object before calling into the @pad callbacks.
1075 * This is used internally by GStreamer.
1077 #define GST_PAD_NEEDS_PARENT(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_NEED_PARENT))
1079 * GST_PAD_IS_PROXY_CAPS:
1082 * Check if the given @pad is set to proxy caps. This means that the default
1083 * event and query handler will forward all events and queries to the
1084 * internally linked @pads instead of discarding them.
1086 #define GST_PAD_IS_PROXY_CAPS(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_PROXY_CAPS))
1088 * GST_PAD_SET_PROXY_CAPS:
1091 * Set @pad to proxy caps, so that all caps-related events and queries are
1092 * proxied down- or upstream to the other side of the element automatically.
1093 * Set this if the element always outputs data in the exact same format as it
1094 * receives as input. This is just for convenience to avoid implementing some
1095 * standard event and query handling code in an element.
1097 #define GST_PAD_SET_PROXY_CAPS(pad) (GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_PROXY_CAPS))
1099 * GST_PAD_UNSET_PROXY_CAPS:
1102 * Unset proxy caps flag.
1104 #define GST_PAD_UNSET_PROXY_CAPS(pad) (GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_PROXY_CAPS))
1106 * GST_PAD_IS_PROXY_ALLOCATION:
1109 * Check if the given @pad is set as proxy allocation which means
1110 * that the default query handler will forward allocation queries to the
1111 * internally linked @pads instead of discarding them.
1113 #define GST_PAD_IS_PROXY_ALLOCATION(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_PROXY_ALLOCATION))
1115 * GST_PAD_SET_PROXY_ALLOCATION:
1118 * Set @pad to proxy allocation queries, which means that the default query
1119 * handler will forward allocation queries to the internally linked @pads
1120 * instead of discarding them.
1121 * Set this if the element always outputs data in the exact same format as it
1122 * receives as input. This is just for convenience to avoid implementing some
1123 * standard query handling code in an element.
1125 #define GST_PAD_SET_PROXY_ALLOCATION(pad) (GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_PROXY_ALLOCATION))
1127 * GST_PAD_UNSET_PROXY_ALLOCATION:
1130 * Unset proxy allocation flag.
1132 #define GST_PAD_UNSET_PROXY_ALLOCATION(pad) (GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_PROXY_ALLOCATION))
1134 * GST_PAD_IS_PROXY_SCHEDULING:
1137 * Check if the given @pad is set to proxy scheduling queries, which means that
1138 * the default query handler will forward scheduling queries to the internally
1139 * linked @pads instead of discarding them.
1141 #define GST_PAD_IS_PROXY_SCHEDULING(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_PROXY_SCHEDULING))
1143 * GST_PAD_SET_PROXY_SCHEDULING:
1146 * Set @pad to proxy scheduling queries, which means that the default query
1147 * handler will forward scheduling queries to the internally linked @pads
1148 * instead of discarding them. You will usually want to handle scheduling
1149 * queries explicitly if your element supports multiple scheduling modes.
1151 #define GST_PAD_SET_PROXY_SCHEDULING(pad) (GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_PROXY_SCHEDULING))
1153 * GST_PAD_UNSET_PROXY_SCHEDULING:
1156 * Unset proxy scheduling flag.
1158 #define GST_PAD_UNSET_PROXY_SCHEDULING(pad) (GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_PROXY_SCHEDULING))
1160 * GST_PAD_IS_ACCEPT_INTERSECT:
1163 * Check if the pad's accept intersect flag is set. The default accept-caps
1164 * handler will check if the caps intersect the query-caps result instead of
1165 * checking for a subset. This is interesting for parser elements that can
1166 * accept incompletely specified caps.
1168 #define GST_PAD_IS_ACCEPT_INTERSECT(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_ACCEPT_INTERSECT))
1170 * GST_PAD_SET_ACCEPT_INTERSECT:
1173 * Set @pad to by default accept caps by intersecting the result instead of
1174 * checking for a subset. This is interesting for parser elements that can
1175 * accept incompletely specified caps.
1177 #define GST_PAD_SET_ACCEPT_INTERSECT(pad) (GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_ACCEPT_INTERSECT))
1179 * GST_PAD_UNSET_ACCEPT_INTERSECT:
1182 * Unset accept intersect flag.
1184 #define GST_PAD_UNSET_ACCEPT_INTERSECT(pad) (GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_ACCEPT_INTERSECT))
1186 * GST_PAD_IS_ACCEPT_TEMPLATE:
1189 * Check if the pad's accept caps operation will use the pad template caps.
1190 * The default accept-caps will do a query caps to get the caps, which might
1191 * be querying downstream causing unnecessary overhead. It is recommended to
1192 * implement a proper accept-caps query handler or to use this flag to prevent
1193 * recursive accept-caps handling.
1197 #define GST_PAD_IS_ACCEPT_TEMPLATE(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_ACCEPT_TEMPLATE))
1199 * GST_PAD_SET_ACCEPT_TEMPLATE:
1202 * Set @pad to by default use the pad template caps to compare with
1203 * the accept caps instead of using a caps query result.
1207 #define GST_PAD_SET_ACCEPT_TEMPLATE(pad) (GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_ACCEPT_TEMPLATE))
1209 * GST_PAD_UNSET_ACCEPT_TEMPLATE:
1212 * Unset accept template flag.
1216 #define GST_PAD_UNSET_ACCEPT_TEMPLATE(pad) (GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_ACCEPT_TEMPLATE))
1218 * GST_PAD_GET_STREAM_LOCK:
1221 * Get the stream lock of @pad. The stream lock is protecting the
1222 * resources used in the data processing functions of @pad. Accessor
1223 * macro, use GST_PAD_STREAM_LOCK() and GST_PAD_STREAM_UNLOCK() instead
1224 * to take/release the pad's stream lock.
1226 #define GST_PAD_GET_STREAM_LOCK(pad) (&(GST_PAD_CAST(pad)->stream_rec_lock))
1228 * GST_PAD_STREAM_LOCK:
1231 * Take the pad's stream lock. The stream lock is recursive and will be taken
1232 * when buffers or serialized downstream events are pushed on a pad.
1234 #define GST_PAD_STREAM_LOCK(pad) g_rec_mutex_lock(GST_PAD_GET_STREAM_LOCK(pad))
1236 * GST_PAD_STREAM_TRYLOCK:
1239 * Try to take the pad's stream lock, and return %TRUE if the lock could be
1240 * taken, and otherwise %FALSE.
1242 #define GST_PAD_STREAM_TRYLOCK(pad) g_rec_mutex_trylock(GST_PAD_GET_STREAM_LOCK(pad))
1244 * GST_PAD_STREAM_UNLOCK:
1247 * Release the pad's stream lock.
1249 #define GST_PAD_STREAM_UNLOCK(pad) g_rec_mutex_unlock(GST_PAD_GET_STREAM_LOCK(pad))
1251 * GST_PAD_LAST_FLOW_RETURN:
1254 * Gets the last flow return on this pad
1258 #define GST_PAD_LAST_FLOW_RETURN(pad) (GST_PAD_CAST(pad)->ABI.abi.last_flowret)
1260 #define GST_PAD_BLOCK_GET_COND(pad) (&GST_PAD_CAST(pad)->block_cond)
1261 #define GST_PAD_BLOCK_WAIT(pad) (g_cond_wait(GST_PAD_BLOCK_GET_COND (pad), GST_OBJECT_GET_LOCK (pad)))
1262 #define GST_PAD_BLOCK_SIGNAL(pad) (g_cond_signal(GST_PAD_BLOCK_GET_COND (pad)))
1263 #define GST_PAD_BLOCK_BROADCAST(pad) (g_cond_broadcast(GST_PAD_BLOCK_GET_COND (pad)))
1265 GType gst_pad_get_type (void);
1268 GstPad* gst_pad_new (const gchar *name, GstPadDirection direction);
1269 GstPad* gst_pad_new_from_template (GstPadTemplate *templ, const gchar *name);
1270 GstPad* gst_pad_new_from_static_template (GstStaticPadTemplate *templ, const gchar *name);
1275 * @pad: the pad to get the name from
1277 * Get a copy of the name of the pad. g_free() after usage.
1281 #define gst_pad_get_name(pad) gst_object_get_name (GST_OBJECT_CAST (pad))
1283 * gst_pad_get_parent:
1284 * @pad: the pad to get the parent of
1286 * Get the parent of @pad. This function increases the refcount
1287 * of the parent object so you should gst_object_unref() it after usage.
1288 * Can return %NULL if the pad did not have a parent.
1292 * Returns: (nullable): the parent
1294 #define gst_pad_get_parent(pad) gst_object_get_parent (GST_OBJECT_CAST (pad))
1296 GstPadDirection gst_pad_get_direction (GstPad *pad);
1298 gboolean gst_pad_set_active (GstPad *pad, gboolean active);
1299 gboolean gst_pad_is_active (GstPad *pad);
1300 gboolean gst_pad_activate_mode (GstPad *pad, GstPadMode mode,
1303 gulong gst_pad_add_probe (GstPad *pad,
1304 GstPadProbeType mask,
1305 GstPadProbeCallback callback,
1307 GDestroyNotify destroy_data);
1308 void gst_pad_remove_probe (GstPad *pad, gulong id);
1310 gboolean gst_pad_is_blocked (GstPad *pad);
1311 gboolean gst_pad_is_blocking (GstPad *pad);
1313 void gst_pad_mark_reconfigure (GstPad *pad);
1314 gboolean gst_pad_needs_reconfigure (GstPad *pad);
1315 gboolean gst_pad_check_reconfigure (GstPad *pad);
1317 void gst_pad_set_element_private (GstPad *pad, gpointer priv);
1318 gpointer gst_pad_get_element_private (GstPad *pad);
1320 GstPadTemplate* gst_pad_get_pad_template (GstPad *pad);
1322 GstFlowReturn gst_pad_store_sticky_event (GstPad *pad, GstEvent *event);
1323 GstEvent* gst_pad_get_sticky_event (GstPad *pad, GstEventType event_type,
1325 void gst_pad_sticky_events_foreach (GstPad *pad, GstPadStickyEventsForeachFunction foreach_func, gpointer user_data);
1327 /* data passing setup functions */
1328 void gst_pad_set_activate_function_full (GstPad *pad,
1329 GstPadActivateFunction activate,
1331 GDestroyNotify notify);
1332 void gst_pad_set_activatemode_function_full (GstPad *pad,
1333 GstPadActivateModeFunction activatemode,
1335 GDestroyNotify notify);
1336 /* data passing functions */
1337 void gst_pad_set_chain_function_full (GstPad *pad,
1338 GstPadChainFunction chain,
1340 GDestroyNotify notify);
1341 void gst_pad_set_chain_list_function_full (GstPad *pad,
1342 GstPadChainListFunction chainlist,
1344 GDestroyNotify notify);
1345 void gst_pad_set_getrange_function_full (GstPad *pad,
1346 GstPadGetRangeFunction get,
1348 GDestroyNotify notify);
1349 void gst_pad_set_event_function_full (GstPad *pad,
1350 GstPadEventFunction event,
1352 GDestroyNotify notify);
1353 void gst_pad_set_event_full_function_full (GstPad *pad,
1354 GstPadEventFullFunction event,
1356 GDestroyNotify notify);
1358 #define gst_pad_set_activate_function(p,f) gst_pad_set_activate_function_full((p),(f),NULL,NULL)
1359 #define gst_pad_set_activatemode_function(p,f) gst_pad_set_activatemode_function_full((p),(f),NULL,NULL)
1360 #define gst_pad_set_chain_function(p,f) gst_pad_set_chain_function_full((p),(f),NULL,NULL)
1361 #define gst_pad_set_chain_list_function(p,f) gst_pad_set_chain_list_function_full((p),(f),NULL,NULL)
1362 #define gst_pad_set_getrange_function(p,f) gst_pad_set_getrange_function_full((p),(f),NULL,NULL)
1363 #define gst_pad_set_event_function(p,f) gst_pad_set_event_function_full((p),(f),NULL,NULL)
1364 #define gst_pad_set_event_full_function(p,f) gst_pad_set_event_full_function_full((p),(f),NULL,NULL)
1367 void gst_pad_set_link_function_full (GstPad *pad,
1368 GstPadLinkFunction link,
1370 GDestroyNotify notify);
1371 void gst_pad_set_unlink_function_full (GstPad *pad,
1372 GstPadUnlinkFunction unlink,
1374 GDestroyNotify notify);
1376 #define gst_pad_set_link_function(p,f) gst_pad_set_link_function_full((p),(f),NULL,NULL)
1377 #define gst_pad_set_unlink_function(p,f) gst_pad_set_unlink_function_full((p),(f),NULL,NULL)
1379 gboolean gst_pad_can_link (GstPad *srcpad, GstPad *sinkpad);
1380 GstPadLinkReturn gst_pad_link (GstPad *srcpad, GstPad *sinkpad);
1381 GstPadLinkReturn gst_pad_link_full (GstPad *srcpad, GstPad *sinkpad, GstPadLinkCheck flags);
1382 gboolean gst_pad_unlink (GstPad *srcpad, GstPad *sinkpad);
1383 gboolean gst_pad_is_linked (GstPad *pad);
1385 GstPad* gst_pad_get_peer (GstPad *pad);
1387 GstCaps* gst_pad_get_pad_template_caps (GstPad *pad);
1389 /* capsnego function for linked/unlinked pads */
1390 GstCaps * gst_pad_get_current_caps (GstPad * pad);
1391 gboolean gst_pad_has_current_caps (GstPad * pad);
1393 /* capsnego for linked pads */
1394 GstCaps * gst_pad_get_allowed_caps (GstPad * pad);
1397 gint64 gst_pad_get_offset (GstPad *pad);
1398 void gst_pad_set_offset (GstPad *pad, gint64 offset);
1400 /* data passing functions to peer */
1401 GstFlowReturn gst_pad_push (GstPad *pad, GstBuffer *buffer);
1402 GstFlowReturn gst_pad_push_list (GstPad *pad, GstBufferList *list);
1403 GstFlowReturn gst_pad_pull_range (GstPad *pad, guint64 offset, guint size,
1404 GstBuffer **buffer);
1405 gboolean gst_pad_push_event (GstPad *pad, GstEvent *event);
1406 gboolean gst_pad_event_default (GstPad *pad, GstObject *parent,
1408 GstFlowReturn gst_pad_get_last_flow_return (GstPad *pad);
1410 /* data passing functions on pad */
1411 GstFlowReturn gst_pad_chain (GstPad *pad, GstBuffer *buffer);
1412 GstFlowReturn gst_pad_chain_list (GstPad *pad, GstBufferList *list);
1413 GstFlowReturn gst_pad_get_range (GstPad *pad, guint64 offset, guint size,
1414 GstBuffer **buffer);
1415 gboolean gst_pad_send_event (GstPad *pad, GstEvent *event);
1418 gboolean gst_pad_start_task (GstPad *pad, GstTaskFunction func,
1419 gpointer user_data, GDestroyNotify notify);
1420 gboolean gst_pad_pause_task (GstPad *pad);
1421 gboolean gst_pad_stop_task (GstPad *pad);
1423 /* internal links */
1424 void gst_pad_set_iterate_internal_links_function_full (GstPad * pad,
1425 GstPadIterIntLinkFunction iterintlink,
1427 GDestroyNotify notify);
1428 GstIterator * gst_pad_iterate_internal_links (GstPad * pad);
1429 GstIterator * gst_pad_iterate_internal_links_default (GstPad * pad, GstObject *parent);
1431 #define gst_pad_set_iterate_internal_links_function(p,f) gst_pad_set_iterate_internal_links_function_full((p),(f),NULL,NULL)
1433 /* generic query function */
1434 gboolean gst_pad_query (GstPad *pad, GstQuery *query);
1435 gboolean gst_pad_peer_query (GstPad *pad, GstQuery *query);
1436 void gst_pad_set_query_function_full (GstPad *pad, GstPadQueryFunction query,
1438 GDestroyNotify notify);
1439 gboolean gst_pad_query_default (GstPad *pad, GstObject *parent,
1442 #define gst_pad_set_query_function(p,f) gst_pad_set_query_function_full((p),(f),NULL,NULL)
1444 /* misc helper functions */
1445 gboolean gst_pad_forward (GstPad *pad, GstPadForwardFunction forward,
1446 gpointer user_data);
1448 #ifdef G_DEFINE_AUTOPTR_CLEANUP_FUNC
1449 G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstPad, gst_object_unref)
1454 #endif /* __GST_PAD_H__ */