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/gstbufferlist.h>
32 #include <gst/gstcaps.h>
33 #include <gst/gstevent.h>
34 #include <gst/gstquery.h>
35 #include <gst/gsttask.h>
42 #define GST_TYPE_PAD (gst_pad_get_type ())
43 #define GST_IS_PAD(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_PAD))
44 #define GST_IS_PAD_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_PAD))
45 #define GST_PAD(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_PAD, GstPad))
46 #define GST_PAD_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_PAD, GstPadClass))
47 #define GST_PAD_CAST(obj) ((GstPad*)(obj))
50 typedef struct _GstPad GstPad;
51 typedef struct _GstPadPrivate GstPadPrivate;
52 typedef struct _GstPadClass GstPadClass;
56 * @GST_PAD_LINK_OK : link succeeded
57 * @GST_PAD_LINK_WRONG_HIERARCHY: pads have no common grandparent
58 * @GST_PAD_LINK_WAS_LINKED : pad was already linked
59 * @GST_PAD_LINK_WRONG_DIRECTION: pads have wrong direction
60 * @GST_PAD_LINK_NOFORMAT : pads do not have common format
61 * @GST_PAD_LINK_NOSCHED : pads cannot cooperate in scheduling
62 * @GST_PAD_LINK_REFUSED : refused for some reason
64 * Result values from gst_pad_link and friends.
68 GST_PAD_LINK_WRONG_HIERARCHY = -1,
69 GST_PAD_LINK_WAS_LINKED = -2,
70 GST_PAD_LINK_WRONG_DIRECTION = -3,
71 GST_PAD_LINK_NOFORMAT = -4,
72 GST_PAD_LINK_NOSCHED = -5,
73 GST_PAD_LINK_REFUSED = -6
77 * GST_PAD_LINK_FAILED:
78 * @ret: the #GstPadLinkReturn value
80 * Macro to test if the given #GstPadLinkReturn value indicates a failed
83 #define GST_PAD_LINK_FAILED(ret) ((ret) < GST_PAD_LINK_OK)
86 * GST_PAD_LINK_SUCCESSFUL:
87 * @ret: the #GstPadLinkReturn value
89 * Macro to test if the given #GstPadLinkReturn value indicates a successful
92 #define GST_PAD_LINK_SUCCESSFUL(ret) ((ret) >= GST_PAD_LINK_OK)
96 * @GST_FLOW_RESEND: Resend buffer, possibly with new caps (not
97 * sent yet) (unused/unimplemented).
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_SUCCESS: Elements can use values starting from
108 * this (and higher) to define custom success
109 * codes. Since 0.10.7.
110 * @GST_FLOW_CUSTOM_SUCCESS_1: Pre-defined custom success code (define your
111 * custom success code to this to avoid compiler
112 * warnings). Since 0.10.29.
113 * @GST_FLOW_CUSTOM_SUCCESS_2: Pre-defined custom success code. Since 0.10.29.
114 * @GST_FLOW_CUSTOM_ERROR: Elements can use values starting from
115 * this (and lower) to define custom error codes.
117 * @GST_FLOW_CUSTOM_ERROR_1: Pre-defined custom error code (define your
118 * custom error code to this to avoid compiler
119 * warnings). Since 0.10.29.
120 * @GST_FLOW_CUSTOM_ERROR_2: Pre-defined custom error code. Since 0.10.29.
122 * The result of passing data to a pad.
124 * Note that the custom return values should not be exposed outside of the
125 * element scope and are available since 0.10.7.
127 /* FIXME 0.11: remove custom flow returns */
129 /* custom success starts here */
130 GST_FLOW_CUSTOM_SUCCESS_2 = 102,
131 GST_FLOW_CUSTOM_SUCCESS_1 = 101,
132 GST_FLOW_CUSTOM_SUCCESS = 100,
134 /* core predefined */
137 /* expected failures */
138 GST_FLOW_NOT_LINKED = -1,
139 GST_FLOW_WRONG_STATE = -2,
141 GST_FLOW_UNEXPECTED = -3,
142 GST_FLOW_NOT_NEGOTIATED = -4,
144 GST_FLOW_NOT_SUPPORTED = -6,
146 /* custom error starts here */
147 GST_FLOW_CUSTOM_ERROR = -100,
148 GST_FLOW_CUSTOM_ERROR_1 = -101,
149 GST_FLOW_CUSTOM_ERROR_2 = -102
154 * @ret: a #GstFlowReturn value
156 * Macro to test if the given #GstFlowReturn value indicates a fatal
157 * error. This macro is mainly used in elements driving the pipeline to decide
158 * whether an error message should be posted on the bus. Note that such
159 * elements may also need to post an error message in the #GST_FLOW_NOT_LINKED
160 * case which is not caught by this macro.
162 #define GST_FLOW_IS_FATAL(ret) ((ret) <= GST_FLOW_UNEXPECTED)
165 * GST_FLOW_IS_SUCCESS:
166 * @ret: a #GstFlowReturn value
168 * Macro to test if the given #GstFlowReturn value indicates a
170 * This macro is mainly used in elements to decide if the processing
171 * of a buffer was successfull.
175 #define GST_FLOW_IS_SUCCESS(ret) ((ret) >= GST_FLOW_OK)
177 G_CONST_RETURN gchar* gst_flow_get_name (GstFlowReturn ret);
178 GQuark gst_flow_to_quark (GstFlowReturn ret);
182 * @GST_PAD_LINK_CHECK_NOTHING: Don't check hierarchy or caps compatibility.
183 * @GST_PAD_LINK_CHECK_HIERARCHY: Check the pads have same parents/grandparents.
184 * @GST_PAD_LINK_CHECK_TEMPLATE_CAPS: Check if the pads are compatible by using their
186 * @GST_PAD_LINK_CHECK_CAPS: Check if the pads are compatible by comparing the caps
187 * returned by #gst_pad_get_caps.
189 * The amount of check to be done when linking pads.
191 * Warning: Only use these flags if you are 100% certain you know the link will
192 * not fail because of hierarchy/caps failures. If uncertain, use the default
193 * checks (#GST_PAD_LINK_CHECK_DEFAULT) or the regular methods.
199 GST_PAD_LINK_CHECK_NOTHING = 0,
200 GST_PAD_LINK_CHECK_HIERARCHY = 1 << 0,
201 GST_PAD_LINK_CHECK_TEMPLATE_CAPS = 1 << 1,
202 GST_PAD_LINK_CHECK_CAPS = 1 << 2,
206 * GST_PAD_LINK_CHECK_DEFAULT:
208 * The default checks done when linking pads (i.e. the ones used by #gst_pad_link.
212 #define GST_PAD_LINK_CHECK_DEFAULT (GST_PAD_LINK_CHECK_HIERARCHY | GST_PAD_LINK_CHECK_CAPS)
216 * @GST_ACTIVATE_NONE: Pad will not handle dataflow
217 * @GST_ACTIVATE_PUSH: Pad handles dataflow in downstream push mode
218 * @GST_ACTIVATE_PULL: Pad handles dataflow in upstream pull mode
220 * The status of a GstPad. After activating a pad, which usually happens when the
221 * parent element goes from READY to PAUSED, the GstActivateMode defines if the
222 * pad operates in push or pull mode.
231 * GST_PAD_MODE_ACTIVATE:
232 * @mode: a #GstActivateMode
234 * Macro to test if the given #GstActivateMode value indicates that datapassing
235 * is possible or not.
237 #define GST_PAD_MODE_ACTIVATE(mode) ((mode) != GST_ACTIVATE_NONE)
241 * GstPadActivateFunction:
244 * This function is called when the pad is activated during the element
245 * READY to PAUSED state change. By default this function will call the
246 * activate function that puts the pad in push mode but elements can
247 * override this function to activate the pad in pull mode if they wish.
249 * Returns: TRUE if the pad could be activated.
251 typedef gboolean (*GstPadActivateFunction) (GstPad *pad);
253 * GstPadActivateModeFunction:
255 * @active: activate or deactivate the pad.
257 * The prototype of the push and pull activate functions.
259 * Returns: TRUE if the pad could be activated or deactivated.
261 typedef gboolean (*GstPadActivateModeFunction) (GstPad *pad, gboolean active);
266 * GstPadChainFunction:
267 * @pad: the sink #GstPad that performed the chain.
268 * @buffer: the #GstBuffer that is chained, not %NULL.
270 * A function that will be called on sinkpads when chaining buffers.
271 * The function typically processes the data contained in the buffer and
272 * either consumes the data or passes it on to the internally linked pad(s).
274 * The implementer of this function receives a refcount to @buffer and should
275 * gst_buffer_unref() when the buffer is no longer needed.
277 * When a chain function detects an error in the data stream, it must post an
278 * error on the bus and return an appropriate #GstFlowReturn value.
280 * Returns: #GST_FLOW_OK for success
282 typedef GstFlowReturn (*GstPadChainFunction) (GstPad *pad, GstBuffer *buffer);
285 * GstPadChainListFunction:
286 * @pad: the sink #GstPad that performed the chain.
287 * @list: the #GstBufferList that is chained, not %NULL.
289 * A function that will be called on sinkpads when chaining buffer lists.
290 * The function typically processes the data contained in the buffer list and
291 * either consumes the data or passes it on to the internally linked pad(s).
293 * The implementer of this function receives a refcount to @list and
294 * should gst_buffer_list_unref() when the list is no longer needed.
296 * When a chainlist function detects an error in the data stream, it must
297 * post an error on the bus and return an appropriate #GstFlowReturn value.
299 * Returns: #GST_FLOW_OK for success
301 typedef GstFlowReturn (*GstPadChainListFunction) (GstPad *pad, GstBufferList *list);
304 * GstPadGetRangeFunction:
305 * @pad: the src #GstPad to perform the getrange on.
306 * @offset: the offset of the range
307 * @length: the length of the range
308 * @buffer: a memory location to hold the result buffer, cannot be NULL.
310 * This function will be called on source pads when a peer element
311 * request a buffer at the specified @offset and @length. If this function
312 * returns #GST_FLOW_OK, the result buffer will be stored in @buffer. The
313 * contents of @buffer is invalid for any other return value.
315 * This function is installed on a source pad with
316 * gst_pad_set_getrange_function() and can only be called on source pads after
317 * they are successfully activated with gst_pad_activate_pull().
319 * @offset and @length are always given in byte units. @offset must normally be a value
320 * between 0 and the length in bytes of the data available on @pad. The
321 * length (duration in bytes) can be retrieved with a #GST_QUERY_DURATION or with a
322 * #GST_QUERY_SEEKING.
324 * Any @offset larger or equal than the length will make the function return
325 * #GST_FLOW_UNEXPECTED, which corresponds to EOS. In this case @buffer does not
326 * contain a valid buffer.
328 * The buffer size of @buffer will only be smaller than @length when @offset is
329 * near the end of the stream. In all other cases, the size of @buffer must be
330 * exactly the requested size.
332 * It is allowed to call this function with a 0 @length and valid @offset, in
333 * which case @buffer will contain a 0-sized buffer and the function returns
336 * When this function is called with a -1 @offset, the sequentially next buffer
337 * of length @length in the stream is returned.
339 * When this function is called with a -1 @length, a buffer with a default
340 * optimal length is returned in @buffer. The length might depend on the value
343 * Returns: #GST_FLOW_OK for success and a valid buffer in @buffer. Any other
344 * return value leaves @buffer undefined.
346 typedef GstFlowReturn (*GstPadGetRangeFunction) (GstPad *pad, guint64 offset,
347 guint length, GstBuffer **buffer);
350 * GstPadEventFunction:
351 * @pad: the #GstPad to handle the event.
352 * @event: the #GstEvent to handle.
354 * Function signature to handle an event for the pad.
356 * Returns: TRUE if the pad could handle the event.
358 typedef gboolean (*GstPadEventFunction) (GstPad *pad, GstEvent *event);
361 /* FIXME: 0.11: deprecate me, check range should use seeking query */
363 * GstPadCheckGetRangeFunction:
366 * Check if @pad can be activated in pull mode.
368 * This function will be deprecated after 0.10; use the seeking query to check
369 * if a pad can support random access.
371 * Returns: TRUE if the pad can operate in pull mode.
373 typedef gboolean (*GstPadCheckGetRangeFunction) (GstPad *pad);
377 * GstPadIntLinkFunction:
378 * @pad: The #GstPad to query.
380 * The signature of the internal pad link function.
382 * Returns: (element-type Gst.Pad) (transfer container): a newly allocated #GList of pads that are linked to the given pad on
383 * the inside of the parent element.
385 * The caller must call g_list_free() on it after use.
387 * Deprecated: use the threadsafe #GstPadIterIntLinkFunction instead.
389 typedef GList* (*GstPadIntLinkFunction) (GstPad *pad);
392 * GstPadIterIntLinkFunction:
393 * @pad: The #GstPad to query.
395 * The signature of the internal pad link iterator function.
397 * Returns: a new #GstIterator that will iterate over all pads that are
398 * linked to the given pad on the inside of the parent element.
400 * the caller must call gst_iterator_free() after usage.
404 typedef GstIterator* (*GstPadIterIntLinkFunction) (GstPad *pad);
406 /* generic query function */
408 * GstPadQueryTypeFunction:
409 * @pad: a #GstPad to query
411 * The signature of the query types function.
413 * Returns: a constant array of query types
415 typedef const GstQueryType* (*GstPadQueryTypeFunction) (GstPad *pad);
418 * GstPadQueryFunction:
419 * @pad: the #GstPad to query.
420 * @query: the #GstQuery object to execute
422 * The signature of the query function.
424 * Returns: TRUE if the query could be performed.
426 typedef gboolean (*GstPadQueryFunction) (GstPad *pad, GstQuery *query);
432 * @pad: the #GstPad that is linked.
433 * @peer: the peer #GstPad of the link
435 * Function signature to handle a new link on the pad.
437 * Returns: the result of the link with the specified peer.
439 typedef GstPadLinkReturn (*GstPadLinkFunction) (GstPad *pad, GstPad *peer);
441 * GstPadUnlinkFunction
442 * @pad: the #GstPad that is linked.
444 * Function signature to handle a unlinking the pad prom its peer.
446 typedef void (*GstPadUnlinkFunction) (GstPad *pad);
451 * GstPadGetCapsFunction:
452 * @pad: the #GstPad to get the capabilities of.
454 * Returns a copy of the capabilities of the specified pad. By default this
455 * function will return the pad template capabilities, but can optionally
456 * be overridden by elements.
458 * Returns: a newly allocated copy #GstCaps of the pad.
460 typedef GstCaps* (*GstPadGetCapsFunction) (GstPad *pad);
463 * GstPadSetCapsFunction:
464 * @pad: the #GstPad to set the capabilities of.
465 * @caps: the #GstCaps to set
467 * Set @caps on @pad. By default this function updates the caps of the
468 * pad but the function can be overriden by elements to perform extra
469 * actions or verifications.
471 * Returns: TRUE if the caps could be set on the pad.
473 typedef gboolean (*GstPadSetCapsFunction) (GstPad *pad, GstCaps *caps);
475 * GstPadAcceptCapsFunction:
476 * @pad: the #GstPad to check
477 * @caps: the #GstCaps to check
479 * Check if @pad can accept @caps. By default this function will see if @caps
480 * intersect with the result from gst_pad_get_caps() by can be overridden to
481 * perform extra checks.
483 * Returns: TRUE if the caps can be accepted by the pad.
485 typedef gboolean (*GstPadAcceptCapsFunction) (GstPad *pad, GstCaps *caps);
487 * GstPadFixateCapsFunction:
489 * @caps: the #GstCaps to fixate
491 * Given possibly unfixed caps @caps, let @pad use its default prefered
492 * format to make a fixed caps. @caps should be writable. By default this
493 * function will pick the first value of any ranges or lists in the caps but
494 * elements can override this function to perform other behaviour.
496 typedef void (*GstPadFixateCapsFunction) (GstPad *pad, GstCaps *caps);
498 * GstPadBufferAllocFunction:
499 * @pad: a sink #GstPad
500 * @offset: the desired offset of the buffer
501 * @size: the desired size of the buffer
502 * @caps: the desired caps of the buffer
503 * @buf: pointer to hold the allocated buffer.
505 * Ask the sinkpad @pad to allocate a buffer with @offset, @size and @caps.
506 * The result will be stored in @buf.
508 * The purpose of this function is to allocate a buffer that is optimal to
509 * be processed by @pad. The function is mostly overridden by elements that can
510 * provide a hardware buffer in order to avoid additional memcpy operations.
512 * The function can return a buffer that has caps different from the requested
513 * @caps, in which case the upstream element requests a format change to this
515 * If a format change was requested, the returned buffer will be one to hold
516 * the data of said new caps, so its size might be different from the requested
519 * When this function returns anything else than #GST_FLOW_OK, the buffer allocation
520 * failed and @buf does not contain valid data. If the function returns #GST_FLOW_OK and
521 * the @buf is NULL, a #GstBuffer will be created with @caps, @offset and @size.
523 * By default this function returns a new buffer of @size and with @caps containing
524 * purely malloced data. The buffer should be freed with gst_buffer_unref()
527 * Returns: #GST_FLOW_OK if @buf contains a valid buffer, any other return
528 * value means @buf does not hold a valid buffer.
530 typedef GstFlowReturn (*GstPadBufferAllocFunction) (GstPad *pad, guint64 offset, guint size,
531 GstCaps *caps, GstBuffer **buf);
535 * GstPadDispatcherFunction:
536 * @pad: the #GstPad that is dispatched.
537 * @data: the gpointer to optional user data.
539 * A dispatcher function is called for all internally linked pads, see
540 * gst_pad_dispatcher().
542 * Returns: TRUE if the dispatching procedure has to be stopped.
544 typedef gboolean (*GstPadDispatcherFunction) (GstPad *pad, gpointer data);
547 * GstPadBlockCallback:
548 * @pad: the #GstPad that is blockend or unblocked.
549 * @blocked: blocking state for the pad
550 * @user_data: the gpointer to optional user data.
552 * Callback used by gst_pad_set_blocked_async(). Gets called when the blocking
553 * operation succeeds.
555 typedef void (*GstPadBlockCallback) (GstPad *pad, gboolean blocked, gpointer user_data);
559 * @GST_PAD_UNKNOWN: direction is unknown.
560 * @GST_PAD_SRC: the pad is a source pad.
561 * @GST_PAD_SINK: the pad is a sink pad.
563 * The direction of a pad.
573 * @GST_PAD_BLOCKED: is dataflow on a pad blocked
574 * @GST_PAD_FLUSHING: is pad refusing buffers
575 * @GST_PAD_IN_GETCAPS: GstPadGetCapsFunction() is running now
576 * @GST_PAD_IN_SETCAPS: GstPadSetCapsFunction() is running now
577 * @GST_PAD_BLOCKING: is pad currently blocking on a buffer or event
578 * @GST_PAD_FLAG_LAST: offset to define more flags
583 GST_PAD_BLOCKED = (GST_OBJECT_FLAG_LAST << 0),
584 GST_PAD_FLUSHING = (GST_OBJECT_FLAG_LAST << 1),
585 GST_PAD_IN_GETCAPS = (GST_OBJECT_FLAG_LAST << 2),
586 GST_PAD_IN_SETCAPS = (GST_OBJECT_FLAG_LAST << 3),
587 GST_PAD_BLOCKING = (GST_OBJECT_FLAG_LAST << 4),
589 GST_PAD_FLAG_LAST = (GST_OBJECT_FLAG_LAST << 8)
592 /* FIXME: this awful circular dependency need to be resolved properly (see padtemplate.h) */
593 typedef struct _GstPadTemplate GstPadTemplate;
597 * @element_private: private data owned by the parent element
598 * @padtemplate: padtemplate for this pad
599 * @direction: the direction of the pad, cannot change after creating
601 * @stream_rec_lock: recursive stream lock of the pad, used to protect
602 * the data used in streaming.
603 * @task: task for this pad if the pad is actively driving dataflow.
604 * @preroll_lock: lock used when prerolling
605 * @preroll_cond: conf to signal preroll
606 * @block_cond: conditional to signal pad block
607 * @block_callback: callback for the pad block if any
608 * @block_data: user data for @block_callback
609 * @caps: the current caps of the pad
610 * @getcapsfunc: function to get caps of the pad
611 * @setcapsfunc: function to set caps on the pad
612 * @acceptcapsfunc: function to check if pad can accept caps
613 * @fixatecapsfunc: function to fixate caps
614 * @activatefunc: pad activation function
615 * @activatepushfunc: function to activate/deactivate pad in push mode
616 * @activatepullfunc: function to activate/deactivate pad in pull mode
617 * @linkfunc: function called when pad is linked
618 * @unlinkfunc: function called when pad is unlinked
619 * @peer: the pad this pad is linked to
620 * @sched_private: private storage for the scheduler
621 * @chainfunc: function to chain buffer to pad
622 * @checkgetrangefunc: function to check if pad can operate in pull mode
623 * @getrangefunc: function to get a range of data from a pad
624 * @eventfunc: function to send an event to a pad
625 * @mode: current activation mode of the pad
626 * @querytypefunc: get list of supported queries
627 * @queryfunc: perform a query on the pad
628 * @intlinkfunc: get the internal links of this pad
629 * @bufferallocfunc: function to allocate a buffer for this pad
630 * @do_buffer_signals: counter counting installed buffer signals
631 * @do_event_signals: counter counting installed event signals
632 * @iterintlinkfunc: get the internal links iterator of this pad
633 * @block_destroy_data: notify function for gst_pad_set_blocked_async_full()
635 * The #GstPad structure. Use the functions to update the variables.
641 gpointer element_private;
643 GstPadTemplate *padtemplate;
645 GstPadDirection direction;
647 /*< public >*/ /* with STREAM_LOCK */
648 /* streaming rec_lock */
649 GStaticRecMutex *stream_rec_lock;
651 /*< public >*/ /* with PREROLL_LOCK */
652 GMutex *preroll_lock;
655 /*< public >*/ /* with LOCK */
656 /* block cond, mutex is from the object */
658 GstPadBlockCallback block_callback;
661 /* the pad capabilities */
663 GstPadGetCapsFunction getcapsfunc;
664 GstPadSetCapsFunction setcapsfunc;
665 GstPadAcceptCapsFunction acceptcapsfunc;
666 GstPadFixateCapsFunction fixatecapsfunc;
668 GstPadActivateFunction activatefunc;
669 GstPadActivateModeFunction activatepushfunc;
670 GstPadActivateModeFunction activatepullfunc;
673 GstPadLinkFunction linkfunc;
674 GstPadUnlinkFunction unlinkfunc;
677 gpointer sched_private;
679 /* data transport functions */
680 GstPadChainFunction chainfunc;
681 GstPadCheckGetRangeFunction checkgetrangefunc;
682 GstPadGetRangeFunction getrangefunc;
683 GstPadEventFunction eventfunc;
685 GstActivateMode mode;
687 /* generic query method */
688 GstPadQueryTypeFunction querytypefunc;
689 GstPadQueryFunction queryfunc;
692 GstPadIntLinkFunction intlinkfunc;
694 GstPadBufferAllocFunction bufferallocfunc;
696 /* whether to emit signals for have-data. counts number
697 * of handlers attached. */
698 gint do_buffer_signals;
699 gint do_event_signals;
702 /* iterate internal links */
703 GstPadIterIntLinkFunction iterintlinkfunc;
705 /* free block_data */
706 GDestroyNotify block_destroy_data;
711 gboolean block_callback_called;
714 gpointer _gst_reserved[GST_PADDING - 2];
718 struct _GstPadClass {
719 GstObjectClass parent_class;
721 /* signal callbacks */
722 void (*linked) (GstPad *pad, GstPad *peer);
723 void (*unlinked) (GstPad *pad, GstPad *peer);
724 void (*request_link) (GstPad *pad);
725 gboolean (*have_data) (GstPad *pad, GstMiniObject *data);
728 gpointer _gst_reserved[GST_PADDING];
732 /***** helper macros *****/
734 #define GST_PAD_NAME(pad) (GST_OBJECT_NAME(pad))
735 #define GST_PAD_PARENT(pad) (GST_ELEMENT_CAST(GST_OBJECT_PARENT(pad)))
736 #define GST_PAD_ELEMENT_PRIVATE(pad) (GST_PAD_CAST(pad)->element_private)
737 #define GST_PAD_PAD_TEMPLATE(pad) (GST_PAD_CAST(pad)->padtemplate)
738 #define GST_PAD_DIRECTION(pad) (GST_PAD_CAST(pad)->direction)
739 #define GST_PAD_TASK(pad) (GST_PAD_CAST(pad)->task)
740 #define GST_PAD_ACTIVATE_MODE(pad) (GST_PAD_CAST(pad)->mode)
742 #define GST_PAD_ACTIVATEFUNC(pad) (GST_PAD_CAST(pad)->activatefunc)
743 #define GST_PAD_ACTIVATEPUSHFUNC(pad) (GST_PAD_CAST(pad)->activatepushfunc)
744 #define GST_PAD_ACTIVATEPULLFUNC(pad) (GST_PAD_CAST(pad)->activatepullfunc)
745 #define GST_PAD_CHAINFUNC(pad) (GST_PAD_CAST(pad)->chainfunc)
746 #define GST_PAD_CHECKGETRANGEFUNC(pad) (GST_PAD_CAST(pad)->checkgetrangefunc)
747 #define GST_PAD_GETRANGEFUNC(pad) (GST_PAD_CAST(pad)->getrangefunc)
748 #define GST_PAD_EVENTFUNC(pad) (GST_PAD_CAST(pad)->eventfunc)
749 #define GST_PAD_QUERYTYPEFUNC(pad) (GST_PAD_CAST(pad)->querytypefunc)
750 #define GST_PAD_QUERYFUNC(pad) (GST_PAD_CAST(pad)->queryfunc)
751 #ifndef GST_DISABLE_DEPRECATED
752 #define GST_PAD_INTLINKFUNC(pad) (GST_PAD_CAST(pad)->intlinkfunc)
754 #define GST_PAD_ITERINTLINKFUNC(pad) (GST_PAD_CAST(pad)->iterintlinkfunc)
756 #define GST_PAD_PEER(pad) (GST_PAD_CAST(pad)->peer)
757 #define GST_PAD_LINKFUNC(pad) (GST_PAD_CAST(pad)->linkfunc)
758 #define GST_PAD_UNLINKFUNC(pad) (GST_PAD_CAST(pad)->unlinkfunc)
764 * The caps for this pad.
766 #define GST_PAD_CAPS(pad) (GST_PAD_CAST(pad)->caps)
767 #define GST_PAD_GETCAPSFUNC(pad) (GST_PAD_CAST(pad)->getcapsfunc)
768 #define GST_PAD_SETCAPSFUNC(pad) (GST_PAD_CAST(pad)->setcapsfunc)
769 #define GST_PAD_ACCEPTCAPSFUNC(pad) (GST_PAD_CAST(pad)->acceptcapsfunc)
770 #define GST_PAD_FIXATECAPSFUNC(pad) (GST_PAD_CAST(pad)->fixatecapsfunc)
772 #define GST_PAD_BUFFERALLOCFUNC(pad) (GST_PAD_CAST(pad)->bufferallocfunc)
774 #define GST_PAD_DO_BUFFER_SIGNALS(pad) (GST_PAD_CAST(pad)->do_buffer_signals)
775 #define GST_PAD_DO_EVENT_SIGNALS(pad) (GST_PAD_CAST(pad)->do_event_signals)
777 #define GST_PAD_IS_LINKED(pad) (GST_PAD_PEER(pad) != NULL)
778 #define GST_PAD_IS_BLOCKED(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_BLOCKED))
779 #define GST_PAD_IS_BLOCKING(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_BLOCKING))
780 #define GST_PAD_IS_FLUSHING(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLUSHING))
781 #define GST_PAD_IS_IN_GETCAPS(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_IN_GETCAPS))
782 #define GST_PAD_IS_IN_SETCAPS(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_IN_SETCAPS))
783 #define GST_PAD_IS_SRC(pad) (GST_PAD_DIRECTION(pad) == GST_PAD_SRC)
784 #define GST_PAD_IS_SINK(pad) (GST_PAD_DIRECTION(pad) == GST_PAD_SINK)
786 #define GST_PAD_SET_FLUSHING(pad) (GST_OBJECT_FLAG_SET (pad, GST_PAD_FLUSHING))
787 #define GST_PAD_UNSET_FLUSHING(pad) (GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLUSHING))
790 * GST_PAD_GET_STREAM_LOCK:
793 * Get the stream lock of @pad. The stream lock is protecting the
794 * resources used in the data processing functions of @pad.
796 #define GST_PAD_GET_STREAM_LOCK(pad) (GST_PAD_CAST(pad)->stream_rec_lock)
798 * GST_PAD_STREAM_LOCK:
801 * Lock the stream lock of @pad.
803 #define GST_PAD_STREAM_LOCK(pad) (g_static_rec_mutex_lock(GST_PAD_GET_STREAM_LOCK(pad)))
805 * GST_PAD_STREAM_LOCK_FULL:
807 * @t: the number of times to recursively lock
809 * Lock the stream lock of @pad @t times.
811 #define GST_PAD_STREAM_LOCK_FULL(pad,t) (g_static_rec_mutex_lock_full(GST_PAD_GET_STREAM_LOCK(pad), t))
813 * GST_PAD_STREAM_TRYLOCK:
816 * Try to Lock the stream lock of the pad, return TRUE if the lock could be
819 #define GST_PAD_STREAM_TRYLOCK(pad) (g_static_rec_mutex_trylock(GST_PAD_GET_STREAM_LOCK(pad)))
821 * GST_PAD_STREAM_UNLOCK:
824 * Unlock the stream lock of @pad.
826 #define GST_PAD_STREAM_UNLOCK(pad) (g_static_rec_mutex_unlock(GST_PAD_GET_STREAM_LOCK(pad)))
828 * GST_PAD_STREAM_UNLOCK_FULL:
831 * Fully unlock the recursive stream lock of @pad, return the number of times
834 #define GST_PAD_STREAM_UNLOCK_FULL(pad) (g_static_rec_mutex_unlock_full(GST_PAD_GET_STREAM_LOCK(pad)))
836 #define GST_PAD_GET_PREROLL_LOCK(pad) (GST_PAD_CAST(pad)->preroll_lock)
837 #define GST_PAD_PREROLL_LOCK(pad) (g_mutex_lock(GST_PAD_GET_PREROLL_LOCK(pad)))
838 #define GST_PAD_PREROLL_TRYLOCK(pad) (g_mutex_trylock(GST_PAD_GET_PREROLL_LOCK(pad)))
839 #define GST_PAD_PREROLL_UNLOCK(pad) (g_mutex_unlock(GST_PAD_GET_PREROLL_LOCK(pad)))
841 #define GST_PAD_GET_PREROLL_COND(pad) (GST_PAD_CAST(pad)->preroll_cond)
842 #define GST_PAD_PREROLL_WAIT(pad) \
843 g_cond_wait (GST_PAD_GET_PREROLL_COND (pad), GST_PAD_GET_PREROLL_LOCK (pad))
844 #define GST_PAD_PREROLL_TIMED_WAIT(pad, timeval) \
845 g_cond_timed_wait (GST_PAD_GET_PREROLL_COND (pad), GST_PAD_GET_PREROLL_LOCK (pad), timeval)
846 #define GST_PAD_PREROLL_SIGNAL(pad) g_cond_signal (GST_PAD_GET_PREROLL_COND (pad));
847 #define GST_PAD_PREROLL_BROADCAST(pad) g_cond_broadcast (GST_PAD_GET_PREROLL_COND (pad));
849 #define GST_PAD_BLOCK_GET_COND(pad) (GST_PAD_CAST(pad)->block_cond)
850 #define GST_PAD_BLOCK_WAIT(pad) (g_cond_wait(GST_PAD_BLOCK_GET_COND (pad), GST_OBJECT_GET_LOCK (pad)))
851 #define GST_PAD_BLOCK_SIGNAL(pad) (g_cond_signal(GST_PAD_BLOCK_GET_COND (pad)))
852 #define GST_PAD_BLOCK_BROADCAST(pad) (g_cond_broadcast(GST_PAD_BLOCK_GET_COND (pad)))
854 /* FIXME: this awful circular dependency need to be resolved properly (see padtemplate.h) */
855 #include <gst/gstpadtemplate.h>
857 GType gst_pad_get_type (void);
860 GstPad* gst_pad_new (const gchar *name, GstPadDirection direction);
861 GstPad* gst_pad_new_from_template (GstPadTemplate *templ, const gchar *name);
862 GstPad* gst_pad_new_from_static_template (GstStaticPadTemplate *templ, const gchar *name);
867 * @pad: the pad to get the name from
869 * Get a copy of the name of the pad. g_free() after usage.
873 #define gst_pad_get_name(pad) gst_object_get_name (GST_OBJECT_CAST (pad))
875 * gst_pad_get_parent:
876 * @pad: the pad to get the parent of
878 * Get the parent of @pad. This function increases the refcount
879 * of the parent object so you should gst_object_unref() it after usage.
880 * Can return NULL if the pad did not have a parent.
884 #define gst_pad_get_parent(pad) gst_object_get_parent (GST_OBJECT_CAST (pad))
886 GstPadDirection gst_pad_get_direction (GstPad *pad);
888 gboolean gst_pad_set_active (GstPad *pad, gboolean active);
889 gboolean gst_pad_is_active (GstPad *pad);
890 gboolean gst_pad_activate_pull (GstPad *pad, gboolean active);
891 gboolean gst_pad_activate_push (GstPad *pad, gboolean active);
893 gboolean gst_pad_set_blocked (GstPad *pad, gboolean blocked);
894 gboolean gst_pad_set_blocked_async (GstPad *pad, gboolean blocked,
895 GstPadBlockCallback callback, gpointer user_data);
896 gboolean gst_pad_set_blocked_async_full (GstPad *pad, gboolean blocked,
897 GstPadBlockCallback callback, gpointer user_data,
898 GDestroyNotify destroy_data);
899 gboolean gst_pad_is_blocked (GstPad *pad);
900 gboolean gst_pad_is_blocking (GstPad *pad);
902 void gst_pad_set_element_private (GstPad *pad, gpointer priv);
903 gpointer gst_pad_get_element_private (GstPad *pad);
905 GstPadTemplate* gst_pad_get_pad_template (GstPad *pad);
907 void gst_pad_set_bufferalloc_function (GstPad *pad, GstPadBufferAllocFunction bufalloc);
908 GstFlowReturn gst_pad_alloc_buffer (GstPad *pad, guint64 offset, gint size,
909 GstCaps *caps, GstBuffer **buf);
910 GstFlowReturn gst_pad_alloc_buffer_and_set_caps (GstPad *pad, guint64 offset, gint size,
911 GstCaps *caps, GstBuffer **buf);
913 /* data passing setup functions */
914 void gst_pad_set_activate_function (GstPad *pad, GstPadActivateFunction activate);
915 void gst_pad_set_activatepull_function (GstPad *pad, GstPadActivateModeFunction activatepull);
916 void gst_pad_set_activatepush_function (GstPad *pad, GstPadActivateModeFunction activatepush);
917 void gst_pad_set_chain_function (GstPad *pad, GstPadChainFunction chain);
918 void gst_pad_set_chain_list_function (GstPad *pad, GstPadChainListFunction chainlist);
919 void gst_pad_set_getrange_function (GstPad *pad, GstPadGetRangeFunction get);
920 void gst_pad_set_checkgetrange_function (GstPad *pad, GstPadCheckGetRangeFunction check);
921 void gst_pad_set_event_function (GstPad *pad, GstPadEventFunction event);
924 void gst_pad_set_link_function (GstPad *pad, GstPadLinkFunction link);
925 void gst_pad_set_unlink_function (GstPad *pad, GstPadUnlinkFunction unlink);
927 gboolean gst_pad_can_link (GstPad *srcpad, GstPad *sinkpad);
928 GstPadLinkReturn gst_pad_link (GstPad *srcpad, GstPad *sinkpad);
929 GstPadLinkReturn gst_pad_link_full (GstPad *srcpad, GstPad *sinkpad, GstPadLinkCheck flags);
930 gboolean gst_pad_unlink (GstPad *srcpad, GstPad *sinkpad);
931 gboolean gst_pad_is_linked (GstPad *pad);
933 GstPad* gst_pad_get_peer (GstPad *pad);
935 /* capsnego functions */
936 void gst_pad_set_getcaps_function (GstPad *pad, GstPadGetCapsFunction getcaps);
937 void gst_pad_set_acceptcaps_function (GstPad *pad, GstPadAcceptCapsFunction acceptcaps);
938 void gst_pad_set_fixatecaps_function (GstPad *pad, GstPadFixateCapsFunction fixatecaps);
939 void gst_pad_set_setcaps_function (GstPad *pad, GstPadSetCapsFunction setcaps);
941 G_CONST_RETURN GstCaps* gst_pad_get_pad_template_caps (GstPad *pad);
943 /* capsnego function for linked/unlinked pads */
944 GstCaps * gst_pad_get_caps_reffed (GstPad * pad);
945 GstCaps * gst_pad_get_caps (GstPad * pad);
946 void gst_pad_fixate_caps (GstPad * pad, GstCaps *caps);
947 gboolean gst_pad_accept_caps (GstPad * pad, GstCaps *caps);
948 gboolean gst_pad_set_caps (GstPad * pad, GstCaps *caps);
950 GstCaps * gst_pad_peer_get_caps_reffed (GstPad * pad);
951 GstCaps * gst_pad_peer_get_caps (GstPad * pad);
952 gboolean gst_pad_peer_accept_caps (GstPad * pad, GstCaps *caps);
954 /* capsnego for linked pads */
955 GstCaps * gst_pad_get_allowed_caps (GstPad * pad);
956 GstCaps * gst_pad_get_negotiated_caps (GstPad * pad);
958 /* data passing functions to peer */
959 GstFlowReturn gst_pad_push (GstPad *pad, GstBuffer *buffer);
960 GstFlowReturn gst_pad_push_list (GstPad *pad, GstBufferList *list);
961 gboolean gst_pad_check_pull_range (GstPad *pad);
962 GstFlowReturn gst_pad_pull_range (GstPad *pad, guint64 offset, guint size,
964 gboolean gst_pad_push_event (GstPad *pad, GstEvent *event);
965 gboolean gst_pad_event_default (GstPad *pad, GstEvent *event);
967 /* data passing functions on pad */
968 GstFlowReturn gst_pad_chain (GstPad *pad, GstBuffer *buffer);
969 GstFlowReturn gst_pad_chain_list (GstPad *pad, GstBufferList *list);
970 GstFlowReturn gst_pad_get_range (GstPad *pad, guint64 offset, guint size,
972 gboolean gst_pad_send_event (GstPad *pad, GstEvent *event);
975 gboolean gst_pad_start_task (GstPad *pad, GstTaskFunction func,
977 gboolean gst_pad_pause_task (GstPad *pad);
978 gboolean gst_pad_stop_task (GstPad *pad);
981 #ifndef GST_DISABLE_DEPRECATED
982 void gst_pad_set_internal_link_function (GstPad *pad, GstPadIntLinkFunction intlink);
983 GList* gst_pad_get_internal_links (GstPad *pad);
984 GList* gst_pad_get_internal_links_default (GstPad *pad);
987 void gst_pad_set_iterate_internal_links_function (GstPad * pad,
988 GstPadIterIntLinkFunction iterintlink);
989 GstIterator * gst_pad_iterate_internal_links (GstPad * pad);
990 GstIterator * gst_pad_iterate_internal_links_default (GstPad * pad);
993 /* generic query function */
994 void gst_pad_set_query_type_function (GstPad *pad, GstPadQueryTypeFunction type_func);
995 G_CONST_RETURN GstQueryType*
996 gst_pad_get_query_types (GstPad *pad);
997 G_CONST_RETURN GstQueryType*
998 gst_pad_get_query_types_default (GstPad *pad);
1000 gboolean gst_pad_query (GstPad *pad, GstQuery *query);
1001 gboolean gst_pad_peer_query (GstPad *pad, GstQuery *query);
1002 void gst_pad_set_query_function (GstPad *pad, GstPadQueryFunction query);
1003 gboolean gst_pad_query_default (GstPad *pad, GstQuery *query);
1005 /* misc helper functions */
1006 gboolean gst_pad_dispatcher (GstPad *pad, GstPadDispatcherFunction dispatch,
1009 #if !defined(GST_DISABLE_LOADSAVE) && !defined(GST_DISABLE_DEPRECATED)
1010 void gst_pad_load_and_link (xmlNodePtr self, GstObject *parent);
1015 #endif /* __GST_PAD_H__ */