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., 59 Temple Place - Suite 330,
20 * Boston, MA 02111-1307, USA.
27 #include <gst/gstconfig.h>
29 #include <gst/gstobject.h>
30 #include <gst/gstbuffer.h>
31 #include <gst/gstcaps.h>
32 #include <gst/gstevent.h>
33 #include <gst/gstquery.h>
34 #include <gst/gsttask.h>
41 #define GST_TYPE_PAD (gst_pad_get_type ())
42 #define GST_IS_PAD(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_PAD))
43 #define GST_IS_PAD_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_PAD))
44 #define GST_PAD(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_PAD, GstPad))
45 #define GST_PAD_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_PAD, GstPadClass))
46 #define GST_PAD_CAST(obj) ((GstPad*)(obj))
49 typedef struct _GstPad GstPad;
50 typedef struct _GstPadClass GstPadClass;
54 * @GST_PAD_LINK_OK : link succeeded
55 * @GST_PAD_LINK_WRONG_HIERARCHY: pads have no common grandparent
56 * @GST_PAD_LINK_WAS_LINKED : pad was already linked
57 * @GST_PAD_LINK_WRONG_DIRECTION: pads have wrong direction
58 * @GST_PAD_LINK_NOFORMAT : pads do not have common format
59 * @GST_PAD_LINK_NOSCHED : pads cannot cooperate in scheduling
60 * @GST_PAD_LINK_REFUSED : refused for some reason
62 * Result values from gst_pad_link and friends.
66 GST_PAD_LINK_WRONG_HIERARCHY = -1,
67 GST_PAD_LINK_WAS_LINKED = -2,
68 GST_PAD_LINK_WRONG_DIRECTION = -3,
69 GST_PAD_LINK_NOFORMAT = -4,
70 GST_PAD_LINK_NOSCHED = -5,
71 GST_PAD_LINK_REFUSED = -6
75 * GST_PAD_LINK_FAILED:
76 * @ret: the #GstPadLinkReturn value
78 * Macro to test if the given #GstPadLinkReturn value indicates a failed
81 #define GST_PAD_LINK_FAILED(ret) ((ret) < GST_PAD_LINK_OK)
84 * GST_PAD_LINK_SUCCESSFUL:
85 * @ret: the #GstPadLinkReturn value
87 * Macro to test if the given #GstPadLinkReturn value indicates a successful
90 #define GST_PAD_LINK_SUCCESSFUL(ret) ((ret) >= GST_PAD_LINK_OK)
94 * @GST_FLOW_CUSTOM_SUCCESS: Elements can use values starting from
95 * this to define custom success codes.
97 * @GST_FLOW_RESEND: Resend buffer, possibly with new caps.
98 * @GST_FLOW_OK: Data passing was ok.
99 * @GST_FLOW_NOT_LINKED: Pad is not linked.
100 * @GST_FLOW_WRONG_STATE: Pad is in wrong state.
101 * @GST_FLOW_UNEXPECTED: Did not expect anything, like after EOS.
102 * @GST_FLOW_NOT_NEGOTIATED: Pad is not negotiated.
103 * @GST_FLOW_ERROR: Some (fatal) error occured. Element generating
104 * this error should post an error message with more
106 * @GST_FLOW_NOT_SUPPORTED: This operation is not supported.
107 * @GST_FLOW_CUSTOM_ERROR: Elements can use values starting from
108 * this to define custom error codes. Since 0.10.7.
110 * The result of passing data to a pad.
112 * Note that the custom return values should not be exposed outside of the
113 * element scope and are available since 0.10.7.
116 /* custom success starts here */
117 GST_FLOW_CUSTOM_SUCCESS = 100,
119 /* core predefined */
122 /* expected failures */
123 GST_FLOW_NOT_LINKED = -1,
124 GST_FLOW_WRONG_STATE = -2,
126 GST_FLOW_UNEXPECTED = -3,
127 GST_FLOW_NOT_NEGOTIATED = -4,
129 GST_FLOW_NOT_SUPPORTED = -6,
131 /* custom error starts here */
132 GST_FLOW_CUSTOM_ERROR = -100
137 * @ret: a #GstFlowReturn value
139 * Macro to test if the given #GstFlowReturn value indicates a fatal
140 * error. This macro is mainly used in elements to decide when an error
141 * message should be posted on the bus.
143 #define GST_FLOW_IS_FATAL(ret) ((ret) <= GST_FLOW_UNEXPECTED)
146 * GST_FLOW_IS_SUCCESS:
147 * @ret: a #GstFlowReturn value
149 * Macro to test if the given #GstFlowReturn value indicates a
151 * This macro is mainly used in elements to decide if the processing
152 * of a buffer was successfull.
156 #define GST_FLOW_IS_SUCCESS(ret) ((ret) >= GST_FLOW_OK)
158 G_CONST_RETURN gchar* gst_flow_get_name (GstFlowReturn ret);
159 GQuark gst_flow_to_quark (GstFlowReturn ret);
163 * @GST_ACTIVATE_NONE: Pad will not handle dataflow
164 * @GST_ACTIVATE_PUSH: Pad handles dataflow in downstream push mode
165 * @GST_ACTIVATE_PULL: Pad handles dataflow in upstream pull mode
167 * The status of a GstPad. After activating a pad, which usually happens when the
168 * parent element goes from READY to PAUSED, the GstActivateMode defines if the
169 * pad operates in push or pull mode.
178 * GST_PAD_MODE_ACTIVATE:
179 * @mode: a #GstActivateMode
181 * Macro to test if the given #GstActivateMode value indicates that datapassing
182 * is possible or not.
184 #define GST_PAD_MODE_ACTIVATE(mode) ((mode) != GST_ACTIVATE_NONE)
188 * GstPadActivateFunction:
191 * This function is called when the pad is activated during the element
192 * READY to PAUSED state change. By default this function will call the
193 * activate function that puts the pad in push mode but elements can
194 * override this function to activate the pad in pull mode if they wish.
196 * Returns: TRUE if the pad could be activated.
198 typedef gboolean (*GstPadActivateFunction) (GstPad *pad);
200 * GstPadActivateModeFunction:
202 * @active: activate or deactivate the pad.
204 * The prototype of the push and pull activate functions.
206 * Returns: TRUE if the pad could be activated or deactivated.
208 typedef gboolean (*GstPadActivateModeFunction) (GstPad *pad, gboolean active);
213 * GstPadChainFunction:
214 * @pad: the #GstPad that performed the chain.
215 * @buffer: the #GstBuffer that is chained.
217 * A function that will be called on sinkpads when chaining buffers.
219 * Returns: GST_FLOW_OK for success
221 typedef GstFlowReturn (*GstPadChainFunction) (GstPad *pad, GstBuffer *buffer);
223 * GstPadGetRangeFunction:
224 * @pad: the #GstPad to perform the getrange on.
225 * @offset: the offset of the range
226 * @length: the length of the range
227 * @buffer: a memory location to hold the result buffer
229 * This function will be called on sourcepads when a peer element
230 * request a buffer at the specified offset and length. If this function
231 * returns GST_FLOW_OK, the result buffer will be stored in @buffer. The
232 * contents of @buffer is invalid for any other return value.
234 * Returns: GST_FLOW_OK for success
236 typedef GstFlowReturn (*GstPadGetRangeFunction) (GstPad *pad, guint64 offset,
237 guint length, GstBuffer **buffer);
240 * GstPadEventFunction:
241 * @pad: the #GstPad to handle the event.
242 * @event: the #GstEvent to handle.
244 * Function signature to handle an event for the pad.
246 * Returns: TRUE if the pad could handle the event.
248 typedef gboolean (*GstPadEventFunction) (GstPad *pad, GstEvent *event);
251 /* FIXME: 0.11: deprecate me, check range should use seeking query */
253 * GstPadCheckGetRangeFunction:
256 * Check if @pad can be activated in pull mode.
258 * This function will be deprecated after 0.10; use the seeking query to check
259 * if a pad can support random access.
261 * Returns: TRUE if the pad can operate in pull mode.
263 typedef gboolean (*GstPadCheckGetRangeFunction) (GstPad *pad);
267 * GstPadIntLinkFunction:
268 * @pad: The #GstPad to query.
270 * The signature of the internal pad link function.
272 * Returns: a newly allocated #GList of pads that are linked to the given pad on
273 * the inside of the parent element.
274 * The caller must call g_list_free() on it after use.
276 typedef GList* (*GstPadIntLinkFunction) (GstPad *pad);
279 /* generic query function */
281 * GstPadQueryTypeFunction:
282 * @pad: a #GstPad to query
284 * The signature of the query types function.
286 * Returns: a constant array of query types
288 typedef const GstQueryType* (*GstPadQueryTypeFunction) (GstPad *pad);
291 * GstPadQueryFunction:
292 * @pad: the #GstPad to query.
293 * @query: the #GstQuery object to execute
295 * The signature of the query function.
297 * Returns: TRUE if the query could be performed.
299 typedef gboolean (*GstPadQueryFunction) (GstPad *pad, GstQuery *query);
305 * @pad: the #GstPad that is linked.
306 * @peer: the peer #GstPad of the link
308 * Function signature to handle a new link on the pad.
310 * Returns: the result of the link with the specified peer.
312 typedef GstPadLinkReturn (*GstPadLinkFunction) (GstPad *pad, GstPad *peer);
314 * GstPadUnlinkFunction
315 * @pad: the #GstPad that is linked.
317 * Function signature to handle a unlinking the pad prom its peer.
319 typedef void (*GstPadUnlinkFunction) (GstPad *pad);
324 * GstPadGetCapsFunction:
325 * @pad: the #GstPad to get the capabilities of.
327 * Returns a copy of the capabilities of the specified pad. By default this
328 * function will return the pad template capabilities, but can optionally
329 * be overridden by elements.
331 * Returns: a newly allocated copy #GstCaps of the pad.
333 typedef GstCaps* (*GstPadGetCapsFunction) (GstPad *pad);
336 * GstPadSetCapsFunction:
337 * @pad: the #GstPad to set the capabilities of.
338 * @caps: the #GstCaps to set
340 * Set @caps on @pad. By default this function updates the caps of the
341 * pad but the function can be overriden by elements to perform extra
342 * actions or verifications.
344 * Returns: TRUE if the caps could be set on the pad.
346 typedef gboolean (*GstPadSetCapsFunction) (GstPad *pad, GstCaps *caps);
348 * GstPadAcceptCapsFunction:
349 * @pad: the #GstPad to check
350 * @caps: the #GstCaps to check
352 * Check if @pad can accept @caps. By default this function will see if @caps
353 * intersect with the result from gst_pad_get_caps() by can be overridden to
354 * perform extra checks.
356 * Returns: TRUE if the caps can be accepted by the pad.
358 typedef gboolean (*GstPadAcceptCapsFunction) (GstPad *pad, GstCaps *caps);
360 * GstPadFixateCapsFunction:
362 * @caps: the #GstCaps to fixate
364 * Given possibly unfixed caps @caps, let @pad use its default prefered
365 * format to make a fixed caps. @caps should be writable. By default this
366 * function will pick the first value of any ranges or lists in the caps but
367 * elements can override this function to perform other behaviour.
369 typedef void (*GstPadFixateCapsFunction) (GstPad *pad, GstCaps *caps);
371 * GstPadBufferAllocFunction:
372 * @pad: a sink #GstPad
373 * @offset: the desired offset of the buffer
374 * @size: the desired size of the buffer
375 * @caps: the desired caps of the buffer
376 * @buf: pointer to hold the allocated buffer.
378 * Ask the sinkpad @pad to allocate a buffer with @offset, @size and @caps.
379 * The result will be stored in @buf.
381 * The purpose of this function is to allocate a buffer that is optimal to
382 * be processed by @pad. The function is mostly overridden by elements that can
383 * provide a hardware buffer in order to avoid additional memcpy operations.
385 * The function can return a buffer that does not have @caps, in which case the
386 * upstream element requests a format change.
388 * When this function returns anything else than GST_FLOW_OK, the buffer allocation
389 * failed and @buf does not contain valid data.
391 * By default this function returns a new buffer of @size and with @caps containing
392 * purely malloced data.
394 * Returns: GST_FLOW_OK if @buf contains a valid buffer, any other return
395 * value means @buf does not hold a valid buffer.
397 typedef GstFlowReturn (*GstPadBufferAllocFunction) (GstPad *pad, guint64 offset, guint size,
398 GstCaps *caps, GstBuffer **buf);
402 * GstPadDispatcherFunction:
403 * @pad: the #GstPad that is dispatched.
404 * @data: the gpointer to optional user data.
406 * A dispatcher function is called for all internally linked pads, see
407 * gst_pad_dispatcher().
409 * Returns: TRUE if the dispatching procedure has to be stopped.
411 typedef gboolean (*GstPadDispatcherFunction) (GstPad *pad, gpointer data);
414 * GstPadBlockCallback:
415 * @pad: the #GstPad that is blockend or unblocked.
416 * @blocked: blocking state for the pad
417 * @user_data: the gpointer to optional user data.
419 * Callback used by gst_pad_set_blocked_async(). Gets called when the blocking
420 * operation succeeds.
422 typedef void (*GstPadBlockCallback) (GstPad *pad, gboolean blocked, gpointer user_data);
426 * @GST_PAD_UNKNOWN: direction is unknown.
427 * @GST_PAD_SRC: the pad is a source pad.
428 * @GST_PAD_SINK: the pad is a sink pad.
430 * The direction of a pad.
440 * @GST_PAD_BLOCKED: is dataflow on a pad blocked
441 * @GST_PAD_FLUSHING: is pad refusing buffers
442 * @GST_PAD_IN_GETCAPS: GstPadGetCapsFunction() is running now
443 * @GST_PAD_IN_SETCAPS: GstPadSetCapsFunction() is running now
444 * @GST_PAD_FLAG_LAST: offset to define more flags
449 GST_PAD_BLOCKED = (GST_OBJECT_FLAG_LAST << 0),
450 GST_PAD_FLUSHING = (GST_OBJECT_FLAG_LAST << 1),
451 GST_PAD_IN_GETCAPS = (GST_OBJECT_FLAG_LAST << 2),
452 GST_PAD_IN_SETCAPS = (GST_OBJECT_FLAG_LAST << 3),
454 GST_PAD_FLAG_LAST = (GST_OBJECT_FLAG_LAST << 8)
457 /* FIXME: this awful circular dependency need to be resolved properly (see padtemplate.h) */
458 typedef struct _GstPadTemplate GstPadTemplate;
462 * @element_private: private data owned by the parent element
463 * @padtemplate: padtemplate for this pad
464 * @direction: the direction of the pad, cannot change after creating
466 * @stream_rec_lock: recursive stream lock of the pad, used to protect
467 * the data used in streaming.
468 * @task: task for this pad if the pad is actively driving dataflow.
469 * @preroll_lock: lock used when prerolling
470 * @preroll_cond: conf to signal preroll
471 * @block_cond: conditional to signal pad block
472 * @block_callback: callback for the pad block if any
473 * @block_data: user data for @block_callback
474 * @caps: the current caps of the pad
475 * @getcapsfunc: function to get caps of the pad
476 * @setcapsfunc: function to set caps on the pad
477 * @acceptcapsfunc: function to check if pad can accept caps
478 * @fixatecapsfunc: function to fixate caps
479 * @activatefunc: pad activation function
480 * @activatepushfunc: function to activate/deactivate pad in push mode
481 * @activatepullfunc: function to activate/deactivate pad in pull mode
482 * @linkfunc: function called when pad is linked
483 * @unlinkfunc: function called when pad is unlinked
484 * @peer: the pad this pad is linked to
485 * @sched_private: private storage for the scheduler
486 * @chainfunc: function to chain data to pad
487 * @checkgetrangefunc: function to check if pad can operate in pull mode
488 * @getrangefunc: function to get a range of data from a pad
489 * @eventfunc: function to send an event to a pad
490 * @mode: current activation mode of the pad
491 * @querytypefunc: get list of supported queries
492 * @queryfunc: perform a query on the pad
493 * @intlinkfunc: get the internal links of this pad
494 * @bufferallocfunc: function to allocate a buffer for this pad
495 * @do_buffer_signals: counter counting installed buffer signals
496 * @do_event_signals: counter counting installed event signals
498 * The #GstPad structure. Use the functions to update the variables.
504 gpointer element_private;
506 GstPadTemplate *padtemplate;
508 GstPadDirection direction;
510 /*< public >*/ /* with STREAM_LOCK */
511 /* streaming rec_lock */
512 GStaticRecMutex *stream_rec_lock;
514 /*< public >*/ /* with PREROLL_LOCK */
515 GMutex *preroll_lock;
518 /*< public >*/ /* with LOCK */
519 /* block cond, mutex is from the object */
521 GstPadBlockCallback block_callback;
524 /* the pad capabilities */
526 GstPadGetCapsFunction getcapsfunc;
527 GstPadSetCapsFunction setcapsfunc;
528 GstPadAcceptCapsFunction acceptcapsfunc;
529 GstPadFixateCapsFunction fixatecapsfunc;
531 GstPadActivateFunction activatefunc;
532 GstPadActivateModeFunction activatepushfunc;
533 GstPadActivateModeFunction activatepullfunc;
536 GstPadLinkFunction linkfunc;
537 GstPadUnlinkFunction unlinkfunc;
540 gpointer sched_private;
542 /* data transport functions */
543 GstPadChainFunction chainfunc;
544 GstPadCheckGetRangeFunction checkgetrangefunc;
545 GstPadGetRangeFunction getrangefunc;
546 GstPadEventFunction eventfunc;
548 GstActivateMode mode;
550 /* generic query method */
551 GstPadQueryTypeFunction querytypefunc;
552 GstPadQueryFunction queryfunc;
555 GstPadIntLinkFunction intlinkfunc;
557 GstPadBufferAllocFunction bufferallocfunc;
559 /* whether to emit signals for have-data. counts number
560 * of handlers attached. */
561 gint do_buffer_signals;
562 gint do_event_signals;
565 gpointer _gst_reserved[GST_PADDING];
568 struct _GstPadClass {
569 GstObjectClass parent_class;
571 /* signal callbacks */
572 void (*linked) (GstPad *pad, GstPad *peer);
573 void (*unlinked) (GstPad *pad, GstPad *peer);
574 void (*request_link) (GstPad *pad);
575 gboolean (*have_data) (GstPad *pad, GstMiniObject *data);
578 gpointer _gst_reserved[GST_PADDING];
582 /***** helper macros *****/
584 #define GST_PAD_NAME(pad) (GST_OBJECT_NAME(pad))
585 #define GST_PAD_PARENT(pad) (GST_ELEMENT_CAST(GST_OBJECT_PARENT(pad)))
586 #define GST_PAD_ELEMENT_PRIVATE(pad) (GST_PAD_CAST(pad)->element_private)
587 #define GST_PAD_PAD_TEMPLATE(pad) (GST_PAD_CAST(pad)->padtemplate)
588 #define GST_PAD_DIRECTION(pad) (GST_PAD_CAST(pad)->direction)
589 #define GST_PAD_TASK(pad) (GST_PAD_CAST(pad)->task)
590 #define GST_PAD_ACTIVATE_MODE(pad) (GST_PAD_CAST(pad)->mode)
592 #define GST_PAD_ACTIVATEFUNC(pad) (GST_PAD_CAST(pad)->activatefunc)
593 #define GST_PAD_ACTIVATEPUSHFUNC(pad) (GST_PAD_CAST(pad)->activatepushfunc)
594 #define GST_PAD_ACTIVATEPULLFUNC(pad) (GST_PAD_CAST(pad)->activatepullfunc)
595 #define GST_PAD_CHAINFUNC(pad) (GST_PAD_CAST(pad)->chainfunc)
596 #define GST_PAD_CHECKGETRANGEFUNC(pad) (GST_PAD_CAST(pad)->checkgetrangefunc)
597 #define GST_PAD_GETRANGEFUNC(pad) (GST_PAD_CAST(pad)->getrangefunc)
598 #define GST_PAD_EVENTFUNC(pad) (GST_PAD_CAST(pad)->eventfunc)
599 #define GST_PAD_QUERYTYPEFUNC(pad) (GST_PAD_CAST(pad)->querytypefunc)
600 #define GST_PAD_QUERYFUNC(pad) (GST_PAD_CAST(pad)->queryfunc)
601 #define GST_PAD_INTLINKFUNC(pad) (GST_PAD_CAST(pad)->intlinkfunc)
603 #define GST_PAD_PEER(pad) (GST_PAD_CAST(pad)->peer)
604 #define GST_PAD_LINKFUNC(pad) (GST_PAD_CAST(pad)->linkfunc)
605 #define GST_PAD_UNLINKFUNC(pad) (GST_PAD_CAST(pad)->unlinkfunc)
607 #define GST_PAD_CAPS(pad) (GST_PAD_CAST(pad)->caps)
608 #define GST_PAD_GETCAPSFUNC(pad) (GST_PAD_CAST(pad)->getcapsfunc)
609 #define GST_PAD_SETCAPSFUNC(pad) (GST_PAD_CAST(pad)->setcapsfunc)
610 #define GST_PAD_ACCEPTCAPSFUNC(pad) (GST_PAD_CAST(pad)->acceptcapsfunc)
611 #define GST_PAD_FIXATECAPSFUNC(pad) (GST_PAD_CAST(pad)->fixatecapsfunc)
613 #define GST_PAD_BUFFERALLOCFUNC(pad) (GST_PAD_CAST(pad)->bufferallocfunc)
615 #define GST_PAD_DO_BUFFER_SIGNALS(pad) (GST_PAD_CAST(pad)->do_buffer_signals)
616 #define GST_PAD_DO_EVENT_SIGNALS(pad) (GST_PAD_CAST(pad)->do_event_signals)
618 #define GST_PAD_IS_LINKED(pad) (GST_PAD_PEER(pad) != NULL)
619 #define GST_PAD_IS_BLOCKED(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_BLOCKED))
620 #define GST_PAD_IS_FLUSHING(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLUSHING))
621 #define GST_PAD_IS_IN_GETCAPS(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_IN_GETCAPS))
622 #define GST_PAD_IS_IN_SETCAPS(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_IN_SETCAPS))
623 #define GST_PAD_IS_SRC(pad) (GST_PAD_DIRECTION(pad) == GST_PAD_SRC)
624 #define GST_PAD_IS_SINK(pad) (GST_PAD_DIRECTION(pad) == GST_PAD_SINK)
626 #define GST_PAD_SET_FLUSHING(pad) (GST_OBJECT_FLAG_SET (pad, GST_PAD_FLUSHING))
627 #define GST_PAD_UNSET_FLUSHING(pad) (GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLUSHING))
630 * GST_PAD_GET_STREAM_LOCK:
633 * Get the stream lock of @pad. The stream lock is protecting the
634 * resources used in the data processing functions of @pad.
636 #define GST_PAD_GET_STREAM_LOCK(pad) (GST_PAD_CAST(pad)->stream_rec_lock)
638 * GST_PAD_STREAM_LOCK:
641 * Lock the stream lock of @pad.
643 #define GST_PAD_STREAM_LOCK(pad) (g_static_rec_mutex_lock(GST_PAD_GET_STREAM_LOCK(pad)))
645 * GST_PAD_STREAM_LOCK_FULL:
647 * @t: the number of times to recursively lock
649 * Lock the stream lock of @pad @t times.
651 #define GST_PAD_STREAM_LOCK_FULL(pad,t) (g_static_rec_mutex_lock_full(GST_PAD_GET_STREAM_LOCK(pad), t))
653 * GST_PAD_STREAM_TRYLOCK:
656 * Try to Lock the stream lock of the pad, return TRUE if the lock could be
659 #define GST_PAD_STREAM_TRYLOCK(pad) (g_static_rec_mutex_trylock(GST_PAD_GET_STREAM_LOCK(pad)))
661 * GST_PAD_STREAM_UNLOCK:
664 * Unlock the stream lock of @pad.
666 #define GST_PAD_STREAM_UNLOCK(pad) (g_static_rec_mutex_unlock(GST_PAD_GET_STREAM_LOCK(pad)))
668 * GST_PAD_STREAM_UNLOCK_FULL:
671 * Fully unlock the recursive stream lock of @pad, return the number of times
674 #define GST_PAD_STREAM_UNLOCK_FULL(pad) (g_static_rec_mutex_unlock_full(GST_PAD_GET_STREAM_LOCK(pad)))
676 #define GST_PAD_GET_PREROLL_LOCK(pad) (GST_PAD_CAST(pad)->preroll_lock)
677 #define GST_PAD_PREROLL_LOCK(pad) (g_mutex_lock(GST_PAD_GET_PREROLL_LOCK(pad)))
678 #define GST_PAD_PREROLL_TRYLOCK(pad) (g_mutex_trylock(GST_PAD_GET_PREROLL_LOCK(pad)))
679 #define GST_PAD_PREROLL_UNLOCK(pad) (g_mutex_unlock(GST_PAD_GET_PREROLL_LOCK(pad)))
681 #define GST_PAD_GET_PREROLL_COND(pad) (GST_PAD_CAST(pad)->preroll_cond)
682 #define GST_PAD_PREROLL_WAIT(pad) \
683 g_cond_wait (GST_PAD_GET_PREROLL_COND (pad), GST_PAD_GET_PREROLL_LOCK (pad))
684 #define GST_PAD_PREROLL_TIMED_WAIT(pad, timeval) \
685 g_cond_timed_wait (GST_PAD_GET_PREROLL_COND (pad), GST_PAD_GET_PREROLL_LOCK (pad), timeval)
686 #define GST_PAD_PREROLL_SIGNAL(pad) g_cond_signal (GST_PAD_GET_PREROLL_COND (pad));
687 #define GST_PAD_PREROLL_BROADCAST(pad) g_cond_broadcast (GST_PAD_GET_PREROLL_COND (pad));
689 #define GST_PAD_BLOCK_GET_COND(pad) (GST_PAD_CAST(pad)->block_cond)
690 #define GST_PAD_BLOCK_WAIT(pad) (g_cond_wait(GST_PAD_BLOCK_GET_COND (pad), GST_OBJECT_GET_LOCK (pad)))
691 #define GST_PAD_BLOCK_SIGNAL(pad) (g_cond_signal(GST_PAD_BLOCK_GET_COND (pad)))
693 /* FIXME: this awful circular dependency need to be resolved properly (see padtemplate.h) */
694 #include <gst/gstpadtemplate.h>
696 GType gst_pad_get_type (void);
699 GstPad* gst_pad_new (const gchar *name, GstPadDirection direction);
700 GstPad* gst_pad_new_from_template (GstPadTemplate *templ, const gchar *name);
701 GstPad* gst_pad_new_from_static_template (GstStaticPadTemplate *templ, const gchar *name);
706 * @pad: the pad to get the name from
708 * Get a copy of the name of the pad. g_free() after usage.
712 #define gst_pad_get_name(pad) gst_object_get_name (GST_OBJECT_CAST (pad))
714 * gst_pad_get_parent:
715 * @pad: the pad to get the parent of
717 * Get the parent of @pad. This function increases the refcount
718 * of the parent object so you should gst_object_unref() it after usage.
719 * Can return NULL if the pad did not have a parent.
723 #define gst_pad_get_parent(pad) gst_object_get_parent (GST_OBJECT_CAST (pad))
725 GstPadDirection gst_pad_get_direction (GstPad *pad);
727 gboolean gst_pad_set_active (GstPad *pad, gboolean active);
728 gboolean gst_pad_is_active (GstPad *pad);
729 gboolean gst_pad_activate_pull (GstPad *pad, gboolean active);
730 gboolean gst_pad_activate_push (GstPad *pad, gboolean active);
732 gboolean gst_pad_set_blocked (GstPad *pad, gboolean blocked);
733 gboolean gst_pad_set_blocked_async (GstPad *pad, gboolean blocked,
734 GstPadBlockCallback callback, gpointer user_data);
735 gboolean gst_pad_is_blocked (GstPad *pad);
737 void gst_pad_set_element_private (GstPad *pad, gpointer priv);
738 gpointer gst_pad_get_element_private (GstPad *pad);
740 GstPadTemplate* gst_pad_get_pad_template (GstPad *pad);
742 void gst_pad_set_bufferalloc_function (GstPad *pad, GstPadBufferAllocFunction bufalloc);
743 GstFlowReturn gst_pad_alloc_buffer (GstPad *pad, guint64 offset, gint size,
744 GstCaps *caps, GstBuffer **buf);
745 GstFlowReturn gst_pad_alloc_buffer_and_set_caps (GstPad *pad, guint64 offset, gint size,
746 GstCaps *caps, GstBuffer **buf);
748 /* data passing setup functions */
749 void gst_pad_set_activate_function (GstPad *pad, GstPadActivateFunction activate);
750 void gst_pad_set_activatepull_function (GstPad *pad, GstPadActivateModeFunction activatepull);
751 void gst_pad_set_activatepush_function (GstPad *pad, GstPadActivateModeFunction activatepush);
752 void gst_pad_set_chain_function (GstPad *pad, GstPadChainFunction chain);
753 void gst_pad_set_getrange_function (GstPad *pad, GstPadGetRangeFunction get);
754 void gst_pad_set_checkgetrange_function (GstPad *pad, GstPadCheckGetRangeFunction check);
755 void gst_pad_set_event_function (GstPad *pad, GstPadEventFunction event);
758 void gst_pad_set_link_function (GstPad *pad, GstPadLinkFunction link);
759 void gst_pad_set_unlink_function (GstPad *pad, GstPadUnlinkFunction unlink);
761 GstPadLinkReturn gst_pad_link (GstPad *srcpad, GstPad *sinkpad);
762 gboolean gst_pad_unlink (GstPad *srcpad, GstPad *sinkpad);
763 gboolean gst_pad_is_linked (GstPad *pad);
765 GstPad* gst_pad_get_peer (GstPad *pad);
767 /* capsnego functions */
768 void gst_pad_set_getcaps_function (GstPad *pad, GstPadGetCapsFunction getcaps);
769 void gst_pad_set_acceptcaps_function (GstPad *pad, GstPadAcceptCapsFunction acceptcaps);
770 void gst_pad_set_fixatecaps_function (GstPad *pad, GstPadFixateCapsFunction fixatecaps);
771 void gst_pad_set_setcaps_function (GstPad *pad, GstPadSetCapsFunction setcaps);
773 G_CONST_RETURN GstCaps* gst_pad_get_pad_template_caps (GstPad *pad);
775 /* capsnego function for connected/unconnected pads */
776 GstCaps * gst_pad_get_caps (GstPad * pad);
777 void gst_pad_fixate_caps (GstPad * pad, GstCaps *caps);
778 gboolean gst_pad_accept_caps (GstPad * pad, GstCaps *caps);
779 gboolean gst_pad_set_caps (GstPad * pad, GstCaps *caps);
781 GstCaps * gst_pad_peer_get_caps (GstPad * pad);
782 gboolean gst_pad_peer_accept_caps (GstPad * pad, GstCaps *caps);
784 /* capsnego for connected pads */
785 GstCaps * gst_pad_get_allowed_caps (GstPad * srcpad);
786 GstCaps * gst_pad_get_negotiated_caps (GstPad * pad);
788 /* data passing functions to peer */
789 GstFlowReturn gst_pad_push (GstPad *pad, GstBuffer *buffer);
790 gboolean gst_pad_check_pull_range (GstPad *pad);
791 GstFlowReturn gst_pad_pull_range (GstPad *pad, guint64 offset, guint size,
793 gboolean gst_pad_push_event (GstPad *pad, GstEvent *event);
794 gboolean gst_pad_event_default (GstPad *pad, GstEvent *event);
796 /* data passing functions on pad */
797 GstFlowReturn gst_pad_chain (GstPad *pad, GstBuffer *buffer);
798 GstFlowReturn gst_pad_get_range (GstPad *pad, guint64 offset, guint size,
800 gboolean gst_pad_send_event (GstPad *pad, GstEvent *event);
803 gboolean gst_pad_start_task (GstPad *pad, GstTaskFunction func,
805 gboolean gst_pad_pause_task (GstPad *pad);
806 gboolean gst_pad_stop_task (GstPad *pad);
809 void gst_pad_set_internal_link_function (GstPad *pad, GstPadIntLinkFunction intlink);
810 GList* gst_pad_get_internal_links (GstPad *pad);
811 GList* gst_pad_get_internal_links_default (GstPad *pad);
813 /* generic query function */
814 void gst_pad_set_query_type_function (GstPad *pad, GstPadQueryTypeFunction type_func);
815 G_CONST_RETURN GstQueryType*
816 gst_pad_get_query_types (GstPad *pad);
817 G_CONST_RETURN GstQueryType*
818 gst_pad_get_query_types_default (GstPad *pad);
820 gboolean gst_pad_query (GstPad *pad, GstQuery *query);
821 void gst_pad_set_query_function (GstPad *pad, GstPadQueryFunction query);
822 gboolean gst_pad_query_default (GstPad *pad, GstQuery *query);
824 /* misc helper functions */
825 gboolean gst_pad_dispatcher (GstPad *pad, GstPadDispatcherFunction dispatch,
828 #ifndef GST_DISABLE_LOADSAVE
829 void gst_pad_load_and_link (xmlNodePtr self, GstObject *parent);
834 #endif /* __GST_PAD_H__ */