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_RESEND: Resend buffer, possibly with new caps.
95 * @GST_FLOW_OK: Data passing was ok.
96 * @GST_FLOW_NOT_LINKED: Pad is not linked.
97 * @GST_FLOW_WRONG_STATE: Pad is in wrong state.
98 * @GST_FLOW_UNEXPECTED: Did not expect anything, like after EOS.
99 * @GST_FLOW_NOT_NEGOTIATED: Pad is not negotiated.
100 * @GST_FLOW_ERROR: Some (fatal) error occured.
101 * @GST_FLOW_NOT_SUPPORTED: This operation is not supported.
103 * The result of passing data to a linked pad.
108 /* expected failures */
109 GST_FLOW_NOT_LINKED = -1,
110 GST_FLOW_WRONG_STATE = -2,
112 GST_FLOW_UNEXPECTED = -3,
113 GST_FLOW_NOT_NEGOTIATED = -4,
115 GST_FLOW_NOT_SUPPORTED = -6
120 * @ret: a #GstFlowReturn value
122 * Macro to test if the given #GstFlowReturn value indicates a fatal
123 * error. This macro is mainly used in elements to decide when an error
124 * message should be posted on the bus.
126 #define GST_FLOW_IS_FATAL(ret) ((ret) <= GST_FLOW_UNEXPECTED)
128 G_CONST_RETURN gchar* gst_flow_get_name (GstFlowReturn ret);
129 GQuark gst_flow_to_quark (GstFlowReturn ret);
133 * @GST_ACTIVATE_NONE: Pad will not handle dataflow
134 * @GST_ACTIVATE_PUSH: Pad handles dataflow in downstream push mode
135 * @GST_ACTIVATE_PULL: Pad handles dataflow in upstream pull mode
137 * The status of a GstPad. After activating a pad, which usually happens when the
138 * parent element goes from READY to PAUSED, the GstActivateMode defines if the
139 * pad operates in push or pull mode.
148 * GST_PAD_MODE_ACTIVATE:
149 * @mode: a #GstActivateMode
151 * Macro to test if the given #GstActivateMode value indicates that datapassing
152 * is possible or not.
154 #define GST_PAD_MODE_ACTIVATE(mode) ((mode) != GST_ACTIVATE_NONE)
158 * GstPadActivateFunction:
161 * This function is called when the pad is activated during the element
162 * READY to PAUSED state change. By default this function will call the
163 * activate function that puts the pad in push mode but elements can
164 * override this function to activate the pad in pull mode if they wish.
166 * Returns: TRUE if the pad could be activated.
168 typedef gboolean (*GstPadActivateFunction) (GstPad *pad);
170 * GstPadActivateModeFunction:
172 * @active: activate or deactivate the pad.
174 * The prototype of the push and pull activate functions.
176 * Returns: TRUE if the pad could be activated or deactivated.
178 typedef gboolean (*GstPadActivateModeFunction) (GstPad *pad, gboolean active);
183 * GstPadChainFunction:
184 * @pad: the #GstPad that performed the chain.
185 * @buffer: the #GstBuffer that is chained.
187 * A function that will be called on sinkpads when chaining buffers.
189 * Returns: GST_FLOW_OK for success
191 typedef GstFlowReturn (*GstPadChainFunction) (GstPad *pad, GstBuffer *buffer);
193 * GstPadGetRangeFunction:
194 * @pad: the #GstPad to perform the getrange on.
195 * @offset: the offset of the range
196 * @length: the length of the range
197 * @buffer: a memory location to hold the result buffer
199 * This function will be called on sourcepads when a peer element
200 * request a buffer at the specified offset and length. If this function
201 * returns GST_FLOW_OK, the result buffer will be stored in @buffer. The
202 * contents of @buffer is invalid for any other return value.
204 * Returns: GST_FLOW_OK for success
206 typedef GstFlowReturn (*GstPadGetRangeFunction) (GstPad *pad, guint64 offset,
207 guint length, GstBuffer **buffer);
210 * GstPadEventFunction:
211 * @pad: the #GstPad to handle the event.
212 * @event: the #GstEvent to handle.
214 * Function signature to handle an event for the pad.
216 * Returns: TRUE if the pad could handle the event.
218 typedef gboolean (*GstPadEventFunction) (GstPad *pad, GstEvent *event);
221 /* deprecate me, check range should use seeking query */
223 * GstPadCheckGetRangeFunction:
226 * Check if @pad can be activated in pull mode.
228 * Returns: TRUE if the pad can operate in pull mode.
230 * Deprecated: use the seeking query to check if a pad can support
233 typedef gboolean (*GstPadCheckGetRangeFunction) (GstPad *pad);
237 * GstPadIntLinkFunction:
238 * @pad: The #GstPad to query.
240 * The signature of the internal pad link function.
242 * Returns: a newly allocated #GList of pads that are linked to the given pad on
243 * the inside of the parent element.
244 * The caller must call g_list_free() on it after use.
246 typedef GList* (*GstPadIntLinkFunction) (GstPad *pad);
249 /* generic query function */
251 * GstPadQueryTypeFunction:
252 * @pad: a #GstPad to query
254 * The signature of the query types function.
256 * Returns: a constant array of query types
258 typedef const GstQueryType* (*GstPadQueryTypeFunction) (GstPad *pad);
261 * GstPadQueryFunction:
262 * @pad: the #GstPad to query.
263 * @query: the #GstQuery object to execute
265 * The signature of the query function.
267 * Returns: TRUE if the query could be performed.
269 typedef gboolean (*GstPadQueryFunction) (GstPad *pad, GstQuery *query);
275 * @pad: the #GstPad that is linked.
276 * @peer: the peer #GstPad of the link
278 * Function signature to handle a new link on the pad.
280 * Returns: the result of the link with the specified peer.
282 typedef GstPadLinkReturn (*GstPadLinkFunction) (GstPad *pad, GstPad *peer);
284 * GstPadUnlinkFunction
285 * @pad: the #GstPad that is linked.
287 * Function signature to handle a unlinking the pad prom its peer.
289 typedef void (*GstPadUnlinkFunction) (GstPad *pad);
294 * GstPadGetCapsFunction:
295 * @pad: the #GstPad to get the capabilities of.
297 * Returns a copy of the capabilities of the specified pad. By default this
298 * function will return the pad template capabilities, but can optionally
299 * be overridden by elements.
301 * Returns: a newly allocated copy #GstCaps of the pad.
303 typedef GstCaps* (*GstPadGetCapsFunction) (GstPad *pad);
306 * GstPadSetCapsFunction:
307 * @pad: the #GstPad to set the capabilities of.
308 * @caps: the #GstCaps to set
310 * Set @caps on @pad. By default this function updates the caps of the
311 * pad but the function can be overriden by elements to perform extra
312 * actions or verifications.
314 * Returns: TRUE if the caps could be set on the pad.
316 typedef gboolean (*GstPadSetCapsFunction) (GstPad *pad, GstCaps *caps);
318 * GstPadAcceptCapsFunction:
319 * @pad: the #GstPad to check
320 * @caps: the #GstCaps to check
322 * Check if @pad can accept @caps. By default this function will see if @caps
323 * intersect with the result from gst_pad_get_caps() by can be overridden to
324 * perform extra checks.
326 * Returns: TRUE if the caps can be accepted by the pad.
328 typedef gboolean (*GstPadAcceptCapsFunction) (GstPad *pad, GstCaps *caps);
330 * GstPadFixateCapsFunction:
332 * @caps: the #GstCaps to fixate
334 * Given possibly unfixed caps @caps, let @pad use its default prefered
335 * format to make a fixed caps. @caps should be writable. By default this
336 * function will pick the first value of any ranges or lists in the caps but
337 * elements can override this function to perform other behaviour.
339 typedef void (*GstPadFixateCapsFunction) (GstPad *pad, GstCaps *caps);
341 * GstPadBufferAllocFunction:
342 * @pad: a sink #GstPad
343 * @offset: the desired offset of the buffer
344 * @size: the desired size of the buffer
345 * @caps: the desired caps of the buffer
346 * @buf: pointer to hold the allocated buffer.
348 * Ask the sinkpad @pad to allocate a buffer with @offset, @size and @caps.
349 * The result will be stored in @buf.
351 * The purpose of this function is to allocate a buffer that is optimal to
352 * be processed by @pad. The function is mostly overridden by elements that can
353 * provide a hardware buffer in order to avoid additional memcpy operations.
355 * The function can return a buffer that does not have @caps, in which case the
356 * upstream element requests a format change.
358 * When this function returns anything else than GST_FLOW_OK, the buffer allocation
359 * failed and @buf does not contain valid data.
361 * By default this function returns a new buffer of @size and with @caps containing
362 * purely malloced data.
364 * Returns: GST_FLOW_OK if @buf contains a valid buffer, any other return
365 * value means @buf does not hold a valid buffer.
367 typedef GstFlowReturn (*GstPadBufferAllocFunction) (GstPad *pad, guint64 offset, guint size,
368 GstCaps *caps, GstBuffer **buf);
372 * GstPadDispatcherFunction:
373 * @pad: the #GstPad that is dispatched.
374 * @data: the gpointer to optional user data.
376 * A dispatcher function is called for all internally linked pads, see
377 * gst_pad_dispatcher().
379 * Returns: TRUE if the dispatching procedure has to be stopped.
381 typedef gboolean (*GstPadDispatcherFunction) (GstPad *pad, gpointer data);
384 * GstPadBlockCallback:
385 * @pad: the #GstPad that is blockend or unblocked.
386 * @blocked: blocking state for the pad
387 * @user_data: the gpointer to optional user data.
389 * Callback used by gst_pad_set_blocked_async(). Gets called when the blocking
390 * operation succeeds.
392 typedef void (*GstPadBlockCallback) (GstPad *pad, gboolean blocked, gpointer user_data);
396 * @GST_PAD_UNKNOWN: direction is unknown.
397 * @GST_PAD_SRC: the pad is a source pad.
398 * @GST_PAD_SINK: the pad is a sink pad.
400 * The direction of a pad.
410 * @GST_PAD_BLOCKED: is dataflow on a pad blocked
411 * @GST_PAD_FLUSHING: is pad refusing buffers
412 * @GST_PAD_IN_GETCAPS: GstPadGetCapsFunction() is running now
413 * @GST_PAD_IN_SETCAPS: GstPadSetCapsFunction() is running now
414 * @GST_PAD_FLAG_LAST: offset to define more flags
419 GST_PAD_BLOCKED = (GST_OBJECT_FLAG_LAST << 0),
420 GST_PAD_FLUSHING = (GST_OBJECT_FLAG_LAST << 1),
421 GST_PAD_IN_GETCAPS = (GST_OBJECT_FLAG_LAST << 2),
422 GST_PAD_IN_SETCAPS = (GST_OBJECT_FLAG_LAST << 3),
424 GST_PAD_FLAG_LAST = (GST_OBJECT_FLAG_LAST << 8)
427 /* FIXME: this awful circular dependency need to be resolved properly (see padtemplate.h) */
428 typedef struct _GstPadTemplate GstPadTemplate;
432 * @element_private: private data owned by the parent element
433 * @padtemplate: padtemplate for this pad
434 * @direction: the direction of the pad, cannot change after creating
436 * @stream_rec_lock: recursive stream lock of the pad, used to protect
437 * the data used in streaming.
438 * @task: task for this pad if the pad is actively driving dataflow.
439 * @preroll_lock: lock used when prerolling
440 * @preroll_cond: conf to signal preroll
441 * @block_cond: conditional to signal pad block
442 * @block_callback: callback for the pad block if any
443 * @block_data: user data for @block_callback
444 * @caps: the current caps of the pad
445 * @getcapsfunc: function to get caps of the pad
446 * @setcapsfunc: function to set caps on the pad
447 * @acceptcapsfunc: function to check if pad can accept caps
448 * @fixatecapsfunc: function to fixate caps
449 * @activatefunc: pad activation function
450 * @activatepushfunc: function to activate/deactivate pad in push mode
451 * @activatepullfunc: function to activate/deactivate pad in pull mode
452 * @linkfunc: function called when pad is linked
453 * @unlinkfunc: function called when pad is unlinked
454 * @peer: the pad this pad is linked to
455 * @sched_private: private storage for the scheduler
456 * @chainfunc: function to chain data to pad
457 * @checkgetrangefunc: function to check if pad can operate in pull mode
458 * @getrangefunc: function to get a range of data from a pad
459 * @eventfunc: function to send an event to a pad
460 * @mode: current activation mode of the pad
461 * @querytypefunc: get list of supported queries
462 * @queryfunc: perform a query on the pad
463 * @intlinkfunc: get the internal links of this pad
464 * @bufferallocfunc: function to allocate a buffer for this pad
465 * @do_buffer_signals: counter counting installed buffer signals
466 * @do_event_signals: counter counting installed event signals
468 * The #GstPad structure. Use the functions to update the variables.
474 gpointer element_private;
476 GstPadTemplate *padtemplate;
478 GstPadDirection direction;
480 /*< public >*/ /* with STREAM_LOCK */
481 /* streaming rec_lock */
482 GStaticRecMutex *stream_rec_lock;
484 /*< public >*/ /* with PREROLL_LOCK */
485 GMutex *preroll_lock;
488 /*< public >*/ /* with LOCK */
489 /* block cond, mutex is from the object */
491 GstPadBlockCallback block_callback;
494 /* the pad capabilities */
496 GstPadGetCapsFunction getcapsfunc;
497 GstPadSetCapsFunction setcapsfunc;
498 GstPadAcceptCapsFunction acceptcapsfunc;
499 GstPadFixateCapsFunction fixatecapsfunc;
501 GstPadActivateFunction activatefunc;
502 GstPadActivateModeFunction activatepushfunc;
503 GstPadActivateModeFunction activatepullfunc;
506 GstPadLinkFunction linkfunc;
507 GstPadUnlinkFunction unlinkfunc;
510 gpointer sched_private;
512 /* data transport functions */
513 GstPadChainFunction chainfunc;
514 GstPadCheckGetRangeFunction checkgetrangefunc;
515 GstPadGetRangeFunction getrangefunc;
516 GstPadEventFunction eventfunc;
518 GstActivateMode mode;
520 /* generic query method */
521 GstPadQueryTypeFunction querytypefunc;
522 GstPadQueryFunction queryfunc;
525 GstPadIntLinkFunction intlinkfunc;
527 GstPadBufferAllocFunction bufferallocfunc;
529 /* whether to emit signals for have-data. counts number
530 * of handlers attached. */
531 gint do_buffer_signals;
532 gint do_event_signals;
535 gpointer _gst_reserved[GST_PADDING];
538 struct _GstPadClass {
539 GstObjectClass parent_class;
541 /* signal callbacks */
542 void (*linked) (GstPad *pad, GstPad *peer);
543 void (*unlinked) (GstPad *pad, GstPad *peer);
544 void (*request_link) (GstPad *pad);
545 gboolean (*have_data) (GstPad *pad, GstMiniObject *data);
548 gpointer _gst_reserved[GST_PADDING];
552 /***** helper macros *****/
554 #define GST_PAD_NAME(pad) (GST_OBJECT_NAME(pad))
555 #define GST_PAD_PARENT(pad) (GST_ELEMENT_CAST(GST_OBJECT_PARENT(pad)))
556 #define GST_PAD_ELEMENT_PRIVATE(pad) (GST_PAD_CAST(pad)->element_private)
557 #define GST_PAD_PAD_TEMPLATE(pad) (GST_PAD_CAST(pad)->padtemplate)
558 #define GST_PAD_DIRECTION(pad) (GST_PAD_CAST(pad)->direction)
559 #define GST_PAD_TASK(pad) (GST_PAD_CAST(pad)->task)
560 #define GST_PAD_ACTIVATE_MODE(pad) (GST_PAD_CAST(pad)->mode)
562 #define GST_PAD_ACTIVATEFUNC(pad) (GST_PAD_CAST(pad)->activatefunc)
563 #define GST_PAD_ACTIVATEPUSHFUNC(pad) (GST_PAD_CAST(pad)->activatepushfunc)
564 #define GST_PAD_ACTIVATEPULLFUNC(pad) (GST_PAD_CAST(pad)->activatepullfunc)
565 #define GST_PAD_CHAINFUNC(pad) (GST_PAD_CAST(pad)->chainfunc)
566 #define GST_PAD_CHECKGETRANGEFUNC(pad) (GST_PAD_CAST(pad)->checkgetrangefunc)
567 #define GST_PAD_GETRANGEFUNC(pad) (GST_PAD_CAST(pad)->getrangefunc)
568 #define GST_PAD_EVENTFUNC(pad) (GST_PAD_CAST(pad)->eventfunc)
569 #define GST_PAD_QUERYTYPEFUNC(pad) (GST_PAD_CAST(pad)->querytypefunc)
570 #define GST_PAD_QUERYFUNC(pad) (GST_PAD_CAST(pad)->queryfunc)
571 #define GST_PAD_INTLINKFUNC(pad) (GST_PAD_CAST(pad)->intlinkfunc)
573 #define GST_PAD_PEER(pad) (GST_PAD_CAST(pad)->peer)
574 #define GST_PAD_LINKFUNC(pad) (GST_PAD_CAST(pad)->linkfunc)
575 #define GST_PAD_UNLINKFUNC(pad) (GST_PAD_CAST(pad)->unlinkfunc)
577 #define GST_PAD_CAPS(pad) (GST_PAD_CAST(pad)->caps)
578 #define GST_PAD_GETCAPSFUNC(pad) (GST_PAD_CAST(pad)->getcapsfunc)
579 #define GST_PAD_SETCAPSFUNC(pad) (GST_PAD_CAST(pad)->setcapsfunc)
580 #define GST_PAD_ACCEPTCAPSFUNC(pad) (GST_PAD_CAST(pad)->acceptcapsfunc)
581 #define GST_PAD_FIXATECAPSFUNC(pad) (GST_PAD_CAST(pad)->fixatecapsfunc)
583 #define GST_PAD_BUFFERALLOCFUNC(pad) (GST_PAD_CAST(pad)->bufferallocfunc)
585 #define GST_PAD_DO_BUFFER_SIGNALS(pad) (GST_PAD_CAST(pad)->do_buffer_signals)
586 #define GST_PAD_DO_EVENT_SIGNALS(pad) (GST_PAD_CAST(pad)->do_event_signals)
588 #define GST_PAD_IS_LINKED(pad) (GST_PAD_PEER(pad) != NULL)
589 #define GST_PAD_IS_BLOCKED(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_BLOCKED))
590 #define GST_PAD_IS_FLUSHING(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLUSHING))
591 #define GST_PAD_IS_IN_GETCAPS(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_IN_GETCAPS))
592 #define GST_PAD_IS_IN_SETCAPS(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_IN_SETCAPS))
593 #define GST_PAD_IS_SRC(pad) (GST_PAD_DIRECTION(pad) == GST_PAD_SRC)
594 #define GST_PAD_IS_SINK(pad) (GST_PAD_DIRECTION(pad) == GST_PAD_SINK)
596 #define GST_PAD_SET_FLUSHING(pad) (GST_OBJECT_FLAG_SET (pad, GST_PAD_FLUSHING))
597 #define GST_PAD_UNSET_FLUSHING(pad) (GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLUSHING))
600 * GST_PAD_GET_STREAM_LOCK:
603 * Get the stream lock of @pad. The stream lock is protecting the
604 * resources used in the data processing functions of @pad.
606 #define GST_PAD_GET_STREAM_LOCK(pad) (GST_PAD_CAST(pad)->stream_rec_lock)
608 * GST_PAD_STREAM_LOCK:
611 * Lock the stream lock of @pad.
613 #define GST_PAD_STREAM_LOCK(pad) (g_static_rec_mutex_lock(GST_PAD_GET_STREAM_LOCK(pad)))
615 * GST_PAD_STREAM_LOCK_FULL:
617 * @t: the number of times to recursively lock
619 * Lock the stream lock of @pad @t times.
621 #define GST_PAD_STREAM_LOCK_FULL(pad,t) (g_static_rec_mutex_lock_full(GST_PAD_GET_STREAM_LOCK(pad), t))
623 * GST_PAD_STREAM_TRYLOCK:
626 * Try to Lock the stream lock of the pad, return TRUE if the lock could be
629 #define GST_PAD_STREAM_TRYLOCK(pad) (g_static_rec_mutex_trylock(GST_PAD_GET_STREAM_LOCK(pad)))
631 * GST_PAD_STREAM_UNLOCK:
634 * Unlock the stream lock of @pad.
636 #define GST_PAD_STREAM_UNLOCK(pad) (g_static_rec_mutex_unlock(GST_PAD_GET_STREAM_LOCK(pad)))
638 * GST_PAD_STREAM_UNLOCK_FULL:
641 * Fully unlock the recursive stream lock of @pad, return the number of times
644 #define GST_PAD_STREAM_UNLOCK_FULL(pad) (g_static_rec_mutex_unlock_full(GST_PAD_GET_STREAM_LOCK(pad)))
646 #define GST_PAD_GET_PREROLL_LOCK(pad) (GST_PAD_CAST(pad)->preroll_lock)
647 #define GST_PAD_PREROLL_LOCK(pad) (g_mutex_lock(GST_PAD_GET_PREROLL_LOCK(pad)))
648 #define GST_PAD_PREROLL_TRYLOCK(pad) (g_mutex_trylock(GST_PAD_GET_PREROLL_LOCK(pad)))
649 #define GST_PAD_PREROLL_UNLOCK(pad) (g_mutex_unlock(GST_PAD_GET_PREROLL_LOCK(pad)))
651 #define GST_PAD_GET_PREROLL_COND(pad) (GST_PAD_CAST(pad)->preroll_cond)
652 #define GST_PAD_PREROLL_WAIT(pad) \
653 g_cond_wait (GST_PAD_GET_PREROLL_COND (pad), GST_PAD_GET_PREROLL_LOCK (pad))
654 #define GST_PAD_PREROLL_TIMED_WAIT(pad, timeval) \
655 g_cond_timed_wait (GST_PAD_GET_PREROLL_COND (pad), GST_PAD_GET_PREROLL_LOCK (pad), timeval)
656 #define GST_PAD_PREROLL_SIGNAL(pad) g_cond_signal (GST_PAD_GET_PREROLL_COND (pad));
657 #define GST_PAD_PREROLL_BROADCAST(pad) g_cond_broadcast (GST_PAD_GET_PREROLL_COND (pad));
659 #define GST_PAD_BLOCK_GET_COND(pad) (GST_PAD_CAST(pad)->block_cond)
660 #define GST_PAD_BLOCK_WAIT(pad) (g_cond_wait(GST_PAD_BLOCK_GET_COND (pad), GST_OBJECT_GET_LOCK (pad)))
661 #define GST_PAD_BLOCK_SIGNAL(pad) (g_cond_signal(GST_PAD_BLOCK_GET_COND (pad)))
663 /* FIXME: this awful circular dependency need to be resolved properly (see padtemplate.h) */
664 #include <gst/gstpadtemplate.h>
666 GType gst_pad_get_type (void);
669 GstPad* gst_pad_new (const gchar *name, GstPadDirection direction);
670 GstPad* gst_pad_new_from_template (GstPadTemplate *templ, const gchar *name);
671 GstPad* gst_pad_new_from_static_template (GstStaticPadTemplate *templ, const gchar *name);
676 * @pad: the pad to get the name from
678 * Get a copy of the name of the pad. g_free() after usage.
682 #define gst_pad_get_name(pad) gst_object_get_name (GST_OBJECT_CAST (pad))
684 * gst_pad_get_parent:
685 * @pad: the pad to get the parent of
687 * Get the parent of @pad. This function increases the refcount
688 * of the parent object so you should gst_object_unref() it after usage.
689 * Can return NULL if the pad did not have a parent.
693 #define gst_pad_get_parent(pad) gst_object_get_parent (GST_OBJECT_CAST (pad))
695 GstPadDirection gst_pad_get_direction (GstPad *pad);
697 gboolean gst_pad_set_active (GstPad *pad, gboolean active);
698 gboolean gst_pad_is_active (GstPad *pad);
699 gboolean gst_pad_activate_pull (GstPad *pad, gboolean active);
700 gboolean gst_pad_activate_push (GstPad *pad, gboolean active);
702 gboolean gst_pad_set_blocked (GstPad *pad, gboolean blocked);
703 gboolean gst_pad_set_blocked_async (GstPad *pad, gboolean blocked,
704 GstPadBlockCallback callback, gpointer user_data);
705 gboolean gst_pad_is_blocked (GstPad *pad);
707 void gst_pad_set_element_private (GstPad *pad, gpointer priv);
708 gpointer gst_pad_get_element_private (GstPad *pad);
710 GstPadTemplate* gst_pad_get_pad_template (GstPad *pad);
712 void gst_pad_set_bufferalloc_function (GstPad *pad, GstPadBufferAllocFunction bufalloc);
713 GstFlowReturn gst_pad_alloc_buffer (GstPad *pad, guint64 offset, gint size,
714 GstCaps *caps, GstBuffer **buf);
716 /* data passing setup functions */
717 void gst_pad_set_activate_function (GstPad *pad, GstPadActivateFunction activate);
718 void gst_pad_set_activatepull_function (GstPad *pad, GstPadActivateModeFunction activatepull);
719 void gst_pad_set_activatepush_function (GstPad *pad, GstPadActivateModeFunction activatepush);
720 void gst_pad_set_chain_function (GstPad *pad, GstPadChainFunction chain);
721 void gst_pad_set_getrange_function (GstPad *pad, GstPadGetRangeFunction get);
722 void gst_pad_set_checkgetrange_function (GstPad *pad, GstPadCheckGetRangeFunction check);
723 void gst_pad_set_event_function (GstPad *pad, GstPadEventFunction event);
726 void gst_pad_set_link_function (GstPad *pad, GstPadLinkFunction link);
727 void gst_pad_set_unlink_function (GstPad *pad, GstPadUnlinkFunction unlink);
729 GstPadLinkReturn gst_pad_link (GstPad *srcpad, GstPad *sinkpad);
730 gboolean gst_pad_unlink (GstPad *srcpad, GstPad *sinkpad);
731 gboolean gst_pad_is_linked (GstPad *pad);
733 GstPad* gst_pad_get_peer (GstPad *pad);
735 /* capsnego functions */
736 void gst_pad_set_getcaps_function (GstPad *pad, GstPadGetCapsFunction getcaps);
737 void gst_pad_set_acceptcaps_function (GstPad *pad, GstPadAcceptCapsFunction acceptcaps);
738 void gst_pad_set_fixatecaps_function (GstPad *pad, GstPadFixateCapsFunction fixatecaps);
739 void gst_pad_set_setcaps_function (GstPad *pad, GstPadSetCapsFunction setcaps);
741 G_CONST_RETURN GstCaps* gst_pad_get_pad_template_caps (GstPad *pad);
743 /* capsnego function for connected/unconnected pads */
744 GstCaps * gst_pad_get_caps (GstPad * pad);
745 void gst_pad_fixate_caps (GstPad * pad, GstCaps *caps);
746 gboolean gst_pad_accept_caps (GstPad * pad, GstCaps *caps);
747 gboolean gst_pad_set_caps (GstPad * pad, GstCaps *caps);
749 GstCaps * gst_pad_peer_get_caps (GstPad * pad);
750 gboolean gst_pad_peer_accept_caps (GstPad * pad, GstCaps *caps);
752 /* capsnego for connected pads */
753 GstCaps * gst_pad_get_allowed_caps (GstPad * srcpad);
754 GstCaps * gst_pad_get_negotiated_caps (GstPad * pad);
756 /* data passing functions to peer */
757 GstFlowReturn gst_pad_push (GstPad *pad, GstBuffer *buffer);
758 gboolean gst_pad_check_pull_range (GstPad *pad);
759 GstFlowReturn gst_pad_pull_range (GstPad *pad, guint64 offset, guint size,
761 gboolean gst_pad_push_event (GstPad *pad, GstEvent *event);
762 gboolean gst_pad_event_default (GstPad *pad, GstEvent *event);
764 /* data passing functions on pad */
765 GstFlowReturn gst_pad_chain (GstPad *pad, GstBuffer *buffer);
766 GstFlowReturn gst_pad_get_range (GstPad *pad, guint64 offset, guint size,
768 gboolean gst_pad_send_event (GstPad *pad, GstEvent *event);
771 gboolean gst_pad_start_task (GstPad *pad, GstTaskFunction func,
773 gboolean gst_pad_pause_task (GstPad *pad);
774 gboolean gst_pad_stop_task (GstPad *pad);
777 void gst_pad_set_internal_link_function (GstPad *pad, GstPadIntLinkFunction intlink);
778 GList* gst_pad_get_internal_links (GstPad *pad);
779 GList* gst_pad_get_internal_links_default (GstPad *pad);
781 /* generic query function */
782 void gst_pad_set_query_type_function (GstPad *pad, GstPadQueryTypeFunction type_func);
783 G_CONST_RETURN GstQueryType*
784 gst_pad_get_query_types (GstPad *pad);
785 G_CONST_RETURN GstQueryType*
786 gst_pad_get_query_types_default (GstPad *pad);
788 gboolean gst_pad_query (GstPad *pad, GstQuery *query);
789 void gst_pad_set_query_function (GstPad *pad, GstPadQueryFunction query);
790 gboolean gst_pad_query_default (GstPad *pad, GstQuery *query);
792 /* misc helper functions */
793 gboolean gst_pad_dispatcher (GstPad *pad, GstPadDispatcherFunction dispatch,
796 #ifndef GST_DISABLE_LOADSAVE
797 void gst_pad_load_and_link (xmlNodePtr self, GstObject *parent);
802 #endif /* __GST_PAD_H__ */