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 sink #GstPad that performed the chain.
215 * @buffer: the #GstBuffer that is chained, not %NULL.
217 * A function that will be called on sinkpads when chaining buffers.
218 * The function typically processes the data contained in the buffer and
219 * either consumes the data or passes it on to the internally linked pad(s).
221 * The implementer of this function receives a refcount to @buffer and should
222 * gst_buffer_unref() when the buffer is no longer needed.
224 * When a chain function detects an error in the data stream, it must post an
225 * error on the buffer and return an appropriate #GstFlowReturn value.
227 * Returns: #GST_FLOW_OK for success
229 typedef GstFlowReturn (*GstPadChainFunction) (GstPad *pad, GstBuffer *buffer);
231 * GstPadGetRangeFunction:
232 * @pad: the src #GstPad to perform the getrange on.
233 * @offset: the offset of the range
234 * @length: the length of the range
235 * @buffer: a memory location to hold the result buffer, cannot be NULL.
237 * This function will be called on source pads when a peer element
238 * request a buffer at the specified @offset and @length. If this function
239 * returns #GST_FLOW_OK, the result buffer will be stored in @buffer. The
240 * contents of @buffer is invalid for any other return value.
242 * This function is installed on a source pad with
243 * gst_pad_set_getrange_function() and can only be called on source pads after
244 * they are successfully activated with gst_pad_activate_pull().
246 * @offset and @length are always given in byte units. @offset must normally be a value
247 * between 0 and the length in bytes of the data available on @pad. The
248 * length (duration in bytes) can be retrieved with a #GST_QUERY_DURATION or with a
249 * #GST_QUERY_SEEKING.
251 * Any @offset larger or equal than the length will make the function return
252 * #GST_FLOW_UNEXPECTED, which corresponds to EOS. In this case @buffer does not
253 * contain a valid buffer.
255 * The buffer size of @buffer might be smaller than @length when @offset is near
256 * the end of the stream.
258 * It is allowed to call this function with a 0 @length and valid @offset, in
259 * which case @buffer will contain a 0-sized buffer and the function returns
262 * When this function is called with a -1 @offset, the sequentially next buffer
263 * of length @length in the stream is returned.
265 * When this function is called with a -1 @length, a buffer with a default
266 * optimal length is returned in @buffer. The length might depend on the value
269 * Returns: #GST_FLOW_OK for success
271 typedef GstFlowReturn (*GstPadGetRangeFunction) (GstPad *pad, guint64 offset,
272 guint length, GstBuffer **buffer);
275 * GstPadEventFunction:
276 * @pad: the #GstPad to handle the event.
277 * @event: the #GstEvent to handle.
279 * Function signature to handle an event for the pad.
281 * Returns: TRUE if the pad could handle the event.
283 typedef gboolean (*GstPadEventFunction) (GstPad *pad, GstEvent *event);
286 /* FIXME: 0.11: deprecate me, check range should use seeking query */
288 * GstPadCheckGetRangeFunction:
291 * Check if @pad can be activated in pull mode.
293 * This function will be deprecated after 0.10; use the seeking query to check
294 * if a pad can support random access.
296 * Returns: TRUE if the pad can operate in pull mode.
298 typedef gboolean (*GstPadCheckGetRangeFunction) (GstPad *pad);
302 * GstPadIntLinkFunction:
303 * @pad: The #GstPad to query.
305 * The signature of the internal pad link function.
307 * Returns: a newly allocated #GList of pads that are linked to the given pad on
308 * the inside of the parent element.
309 * The caller must call g_list_free() on it after use.
311 typedef GList* (*GstPadIntLinkFunction) (GstPad *pad);
314 /* generic query function */
316 * GstPadQueryTypeFunction:
317 * @pad: a #GstPad to query
319 * The signature of the query types function.
321 * Returns: a constant array of query types
323 typedef const GstQueryType* (*GstPadQueryTypeFunction) (GstPad *pad);
326 * GstPadQueryFunction:
327 * @pad: the #GstPad to query.
328 * @query: the #GstQuery object to execute
330 * The signature of the query function.
332 * Returns: TRUE if the query could be performed.
334 typedef gboolean (*GstPadQueryFunction) (GstPad *pad, GstQuery *query);
340 * @pad: the #GstPad that is linked.
341 * @peer: the peer #GstPad of the link
343 * Function signature to handle a new link on the pad.
345 * Returns: the result of the link with the specified peer.
347 typedef GstPadLinkReturn (*GstPadLinkFunction) (GstPad *pad, GstPad *peer);
349 * GstPadUnlinkFunction
350 * @pad: the #GstPad that is linked.
352 * Function signature to handle a unlinking the pad prom its peer.
354 typedef void (*GstPadUnlinkFunction) (GstPad *pad);
359 * GstPadGetCapsFunction:
360 * @pad: the #GstPad to get the capabilities of.
362 * Returns a copy of the capabilities of the specified pad. By default this
363 * function will return the pad template capabilities, but can optionally
364 * be overridden by elements.
366 * Returns: a newly allocated copy #GstCaps of the pad.
368 typedef GstCaps* (*GstPadGetCapsFunction) (GstPad *pad);
371 * GstPadSetCapsFunction:
372 * @pad: the #GstPad to set the capabilities of.
373 * @caps: the #GstCaps to set
375 * Set @caps on @pad. By default this function updates the caps of the
376 * pad but the function can be overriden by elements to perform extra
377 * actions or verifications.
379 * Returns: TRUE if the caps could be set on the pad.
381 typedef gboolean (*GstPadSetCapsFunction) (GstPad *pad, GstCaps *caps);
383 * GstPadAcceptCapsFunction:
384 * @pad: the #GstPad to check
385 * @caps: the #GstCaps to check
387 * Check if @pad can accept @caps. By default this function will see if @caps
388 * intersect with the result from gst_pad_get_caps() by can be overridden to
389 * perform extra checks.
391 * Returns: TRUE if the caps can be accepted by the pad.
393 typedef gboolean (*GstPadAcceptCapsFunction) (GstPad *pad, GstCaps *caps);
395 * GstPadFixateCapsFunction:
397 * @caps: the #GstCaps to fixate
399 * Given possibly unfixed caps @caps, let @pad use its default prefered
400 * format to make a fixed caps. @caps should be writable. By default this
401 * function will pick the first value of any ranges or lists in the caps but
402 * elements can override this function to perform other behaviour.
404 typedef void (*GstPadFixateCapsFunction) (GstPad *pad, GstCaps *caps);
406 * GstPadBufferAllocFunction:
407 * @pad: a sink #GstPad
408 * @offset: the desired offset of the buffer
409 * @size: the desired size of the buffer
410 * @caps: the desired caps of the buffer
411 * @buf: pointer to hold the allocated buffer.
413 * Ask the sinkpad @pad to allocate a buffer with @offset, @size and @caps.
414 * The result will be stored in @buf.
416 * The purpose of this function is to allocate a buffer that is optimal to
417 * be processed by @pad. The function is mostly overridden by elements that can
418 * provide a hardware buffer in order to avoid additional memcpy operations.
420 * The function can return a buffer that does not have @caps, in which case the
421 * upstream element requests a format change. If a format change was requested,
422 * the returned buffer will be one to hold the data of said new caps, so its
423 * size might be different from @size.
425 * When this function returns anything else than #GST_FLOW_OK, the buffer allocation
426 * failed and @buf does not contain valid data.
428 * By default this function returns a new buffer of @size and with @caps containing
429 * purely malloced data. The buffer should be freed with gst_buffer_unref()
432 * Returns: #GST_FLOW_OK if @buf contains a valid buffer, any other return
433 * value means @buf does not hold a valid buffer.
435 typedef GstFlowReturn (*GstPadBufferAllocFunction) (GstPad *pad, guint64 offset, guint size,
436 GstCaps *caps, GstBuffer **buf);
440 * GstPadDispatcherFunction:
441 * @pad: the #GstPad that is dispatched.
442 * @data: the gpointer to optional user data.
444 * A dispatcher function is called for all internally linked pads, see
445 * gst_pad_dispatcher().
447 * Returns: TRUE if the dispatching procedure has to be stopped.
449 typedef gboolean (*GstPadDispatcherFunction) (GstPad *pad, gpointer data);
452 * GstPadBlockCallback:
453 * @pad: the #GstPad that is blockend or unblocked.
454 * @blocked: blocking state for the pad
455 * @user_data: the gpointer to optional user data.
457 * Callback used by gst_pad_set_blocked_async(). Gets called when the blocking
458 * operation succeeds.
460 typedef void (*GstPadBlockCallback) (GstPad *pad, gboolean blocked, gpointer user_data);
464 * @GST_PAD_UNKNOWN: direction is unknown.
465 * @GST_PAD_SRC: the pad is a source pad.
466 * @GST_PAD_SINK: the pad is a sink pad.
468 * The direction of a pad.
478 * @GST_PAD_BLOCKED: is dataflow on a pad blocked
479 * @GST_PAD_FLUSHING: is pad refusing buffers
480 * @GST_PAD_IN_GETCAPS: GstPadGetCapsFunction() is running now
481 * @GST_PAD_IN_SETCAPS: GstPadSetCapsFunction() is running now
482 * @GST_PAD_BLOCKING: is pad currently blocking on a buffer or event
483 * @GST_PAD_FLAG_LAST: offset to define more flags
488 GST_PAD_BLOCKED = (GST_OBJECT_FLAG_LAST << 0),
489 GST_PAD_FLUSHING = (GST_OBJECT_FLAG_LAST << 1),
490 GST_PAD_IN_GETCAPS = (GST_OBJECT_FLAG_LAST << 2),
491 GST_PAD_IN_SETCAPS = (GST_OBJECT_FLAG_LAST << 3),
492 GST_PAD_BLOCKING = (GST_OBJECT_FLAG_LAST << 4),
494 GST_PAD_FLAG_LAST = (GST_OBJECT_FLAG_LAST << 8)
497 /* FIXME: this awful circular dependency need to be resolved properly (see padtemplate.h) */
498 typedef struct _GstPadTemplate GstPadTemplate;
502 * @element_private: private data owned by the parent element
503 * @padtemplate: padtemplate for this pad
504 * @direction: the direction of the pad, cannot change after creating
506 * @stream_rec_lock: recursive stream lock of the pad, used to protect
507 * the data used in streaming.
508 * @task: task for this pad if the pad is actively driving dataflow.
509 * @preroll_lock: lock used when prerolling
510 * @preroll_cond: conf to signal preroll
511 * @block_cond: conditional to signal pad block
512 * @block_callback: callback for the pad block if any
513 * @block_data: user data for @block_callback
514 * @caps: the current caps of the pad
515 * @getcapsfunc: function to get caps of the pad
516 * @setcapsfunc: function to set caps on the pad
517 * @acceptcapsfunc: function to check if pad can accept caps
518 * @fixatecapsfunc: function to fixate caps
519 * @activatefunc: pad activation function
520 * @activatepushfunc: function to activate/deactivate pad in push mode
521 * @activatepullfunc: function to activate/deactivate pad in pull mode
522 * @linkfunc: function called when pad is linked
523 * @unlinkfunc: function called when pad is unlinked
524 * @peer: the pad this pad is linked to
525 * @sched_private: private storage for the scheduler
526 * @chainfunc: function to chain data to pad
527 * @checkgetrangefunc: function to check if pad can operate in pull mode
528 * @getrangefunc: function to get a range of data from a pad
529 * @eventfunc: function to send an event to a pad
530 * @mode: current activation mode of the pad
531 * @querytypefunc: get list of supported queries
532 * @queryfunc: perform a query on the pad
533 * @intlinkfunc: get the internal links of this pad
534 * @bufferallocfunc: function to allocate a buffer for this pad
535 * @do_buffer_signals: counter counting installed buffer signals
536 * @do_event_signals: counter counting installed event signals
538 * The #GstPad structure. Use the functions to update the variables.
544 gpointer element_private;
546 GstPadTemplate *padtemplate;
548 GstPadDirection direction;
550 /*< public >*/ /* with STREAM_LOCK */
551 /* streaming rec_lock */
552 GStaticRecMutex *stream_rec_lock;
554 /*< public >*/ /* with PREROLL_LOCK */
555 GMutex *preroll_lock;
558 /*< public >*/ /* with LOCK */
559 /* block cond, mutex is from the object */
561 GstPadBlockCallback block_callback;
564 /* the pad capabilities */
566 GstPadGetCapsFunction getcapsfunc;
567 GstPadSetCapsFunction setcapsfunc;
568 GstPadAcceptCapsFunction acceptcapsfunc;
569 GstPadFixateCapsFunction fixatecapsfunc;
571 GstPadActivateFunction activatefunc;
572 GstPadActivateModeFunction activatepushfunc;
573 GstPadActivateModeFunction activatepullfunc;
576 GstPadLinkFunction linkfunc;
577 GstPadUnlinkFunction unlinkfunc;
580 gpointer sched_private;
582 /* data transport functions */
583 GstPadChainFunction chainfunc;
584 GstPadCheckGetRangeFunction checkgetrangefunc;
585 GstPadGetRangeFunction getrangefunc;
586 GstPadEventFunction eventfunc;
588 GstActivateMode mode;
590 /* generic query method */
591 GstPadQueryTypeFunction querytypefunc;
592 GstPadQueryFunction queryfunc;
595 GstPadIntLinkFunction intlinkfunc;
597 GstPadBufferAllocFunction bufferallocfunc;
599 /* whether to emit signals for have-data. counts number
600 * of handlers attached. */
601 gint do_buffer_signals;
602 gint do_event_signals;
605 gpointer _gst_reserved[GST_PADDING];
608 struct _GstPadClass {
609 GstObjectClass parent_class;
611 /* signal callbacks */
612 void (*linked) (GstPad *pad, GstPad *peer);
613 void (*unlinked) (GstPad *pad, GstPad *peer);
614 void (*request_link) (GstPad *pad);
615 gboolean (*have_data) (GstPad *pad, GstMiniObject *data);
618 gpointer _gst_reserved[GST_PADDING];
622 /***** helper macros *****/
624 #define GST_PAD_NAME(pad) (GST_OBJECT_NAME(pad))
625 #define GST_PAD_PARENT(pad) (GST_ELEMENT_CAST(GST_OBJECT_PARENT(pad)))
626 #define GST_PAD_ELEMENT_PRIVATE(pad) (GST_PAD_CAST(pad)->element_private)
627 #define GST_PAD_PAD_TEMPLATE(pad) (GST_PAD_CAST(pad)->padtemplate)
628 #define GST_PAD_DIRECTION(pad) (GST_PAD_CAST(pad)->direction)
629 #define GST_PAD_TASK(pad) (GST_PAD_CAST(pad)->task)
630 #define GST_PAD_ACTIVATE_MODE(pad) (GST_PAD_CAST(pad)->mode)
632 #define GST_PAD_ACTIVATEFUNC(pad) (GST_PAD_CAST(pad)->activatefunc)
633 #define GST_PAD_ACTIVATEPUSHFUNC(pad) (GST_PAD_CAST(pad)->activatepushfunc)
634 #define GST_PAD_ACTIVATEPULLFUNC(pad) (GST_PAD_CAST(pad)->activatepullfunc)
635 #define GST_PAD_CHAINFUNC(pad) (GST_PAD_CAST(pad)->chainfunc)
636 #define GST_PAD_CHECKGETRANGEFUNC(pad) (GST_PAD_CAST(pad)->checkgetrangefunc)
637 #define GST_PAD_GETRANGEFUNC(pad) (GST_PAD_CAST(pad)->getrangefunc)
638 #define GST_PAD_EVENTFUNC(pad) (GST_PAD_CAST(pad)->eventfunc)
639 #define GST_PAD_QUERYTYPEFUNC(pad) (GST_PAD_CAST(pad)->querytypefunc)
640 #define GST_PAD_QUERYFUNC(pad) (GST_PAD_CAST(pad)->queryfunc)
641 #define GST_PAD_INTLINKFUNC(pad) (GST_PAD_CAST(pad)->intlinkfunc)
643 #define GST_PAD_PEER(pad) (GST_PAD_CAST(pad)->peer)
644 #define GST_PAD_LINKFUNC(pad) (GST_PAD_CAST(pad)->linkfunc)
645 #define GST_PAD_UNLINKFUNC(pad) (GST_PAD_CAST(pad)->unlinkfunc)
647 #define GST_PAD_CAPS(pad) (GST_PAD_CAST(pad)->caps)
648 #define GST_PAD_GETCAPSFUNC(pad) (GST_PAD_CAST(pad)->getcapsfunc)
649 #define GST_PAD_SETCAPSFUNC(pad) (GST_PAD_CAST(pad)->setcapsfunc)
650 #define GST_PAD_ACCEPTCAPSFUNC(pad) (GST_PAD_CAST(pad)->acceptcapsfunc)
651 #define GST_PAD_FIXATECAPSFUNC(pad) (GST_PAD_CAST(pad)->fixatecapsfunc)
653 #define GST_PAD_BUFFERALLOCFUNC(pad) (GST_PAD_CAST(pad)->bufferallocfunc)
655 #define GST_PAD_DO_BUFFER_SIGNALS(pad) (GST_PAD_CAST(pad)->do_buffer_signals)
656 #define GST_PAD_DO_EVENT_SIGNALS(pad) (GST_PAD_CAST(pad)->do_event_signals)
658 #define GST_PAD_IS_LINKED(pad) (GST_PAD_PEER(pad) != NULL)
659 #define GST_PAD_IS_BLOCKED(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_BLOCKED))
660 #define GST_PAD_IS_BLOCKING(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_BLOCKING))
661 #define GST_PAD_IS_FLUSHING(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLUSHING))
662 #define GST_PAD_IS_IN_GETCAPS(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_IN_GETCAPS))
663 #define GST_PAD_IS_IN_SETCAPS(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_IN_SETCAPS))
664 #define GST_PAD_IS_SRC(pad) (GST_PAD_DIRECTION(pad) == GST_PAD_SRC)
665 #define GST_PAD_IS_SINK(pad) (GST_PAD_DIRECTION(pad) == GST_PAD_SINK)
667 #define GST_PAD_SET_FLUSHING(pad) (GST_OBJECT_FLAG_SET (pad, GST_PAD_FLUSHING))
668 #define GST_PAD_UNSET_FLUSHING(pad) (GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLUSHING))
671 * GST_PAD_GET_STREAM_LOCK:
674 * Get the stream lock of @pad. The stream lock is protecting the
675 * resources used in the data processing functions of @pad.
677 #define GST_PAD_GET_STREAM_LOCK(pad) (GST_PAD_CAST(pad)->stream_rec_lock)
679 * GST_PAD_STREAM_LOCK:
682 * Lock the stream lock of @pad.
684 #define GST_PAD_STREAM_LOCK(pad) (g_static_rec_mutex_lock(GST_PAD_GET_STREAM_LOCK(pad)))
686 * GST_PAD_STREAM_LOCK_FULL:
688 * @t: the number of times to recursively lock
690 * Lock the stream lock of @pad @t times.
692 #define GST_PAD_STREAM_LOCK_FULL(pad,t) (g_static_rec_mutex_lock_full(GST_PAD_GET_STREAM_LOCK(pad), t))
694 * GST_PAD_STREAM_TRYLOCK:
697 * Try to Lock the stream lock of the pad, return TRUE if the lock could be
700 #define GST_PAD_STREAM_TRYLOCK(pad) (g_static_rec_mutex_trylock(GST_PAD_GET_STREAM_LOCK(pad)))
702 * GST_PAD_STREAM_UNLOCK:
705 * Unlock the stream lock of @pad.
707 #define GST_PAD_STREAM_UNLOCK(pad) (g_static_rec_mutex_unlock(GST_PAD_GET_STREAM_LOCK(pad)))
709 * GST_PAD_STREAM_UNLOCK_FULL:
712 * Fully unlock the recursive stream lock of @pad, return the number of times
715 #define GST_PAD_STREAM_UNLOCK_FULL(pad) (g_static_rec_mutex_unlock_full(GST_PAD_GET_STREAM_LOCK(pad)))
717 #define GST_PAD_GET_PREROLL_LOCK(pad) (GST_PAD_CAST(pad)->preroll_lock)
718 #define GST_PAD_PREROLL_LOCK(pad) (g_mutex_lock(GST_PAD_GET_PREROLL_LOCK(pad)))
719 #define GST_PAD_PREROLL_TRYLOCK(pad) (g_mutex_trylock(GST_PAD_GET_PREROLL_LOCK(pad)))
720 #define GST_PAD_PREROLL_UNLOCK(pad) (g_mutex_unlock(GST_PAD_GET_PREROLL_LOCK(pad)))
722 #define GST_PAD_GET_PREROLL_COND(pad) (GST_PAD_CAST(pad)->preroll_cond)
723 #define GST_PAD_PREROLL_WAIT(pad) \
724 g_cond_wait (GST_PAD_GET_PREROLL_COND (pad), GST_PAD_GET_PREROLL_LOCK (pad))
725 #define GST_PAD_PREROLL_TIMED_WAIT(pad, timeval) \
726 g_cond_timed_wait (GST_PAD_GET_PREROLL_COND (pad), GST_PAD_GET_PREROLL_LOCK (pad), timeval)
727 #define GST_PAD_PREROLL_SIGNAL(pad) g_cond_signal (GST_PAD_GET_PREROLL_COND (pad));
728 #define GST_PAD_PREROLL_BROADCAST(pad) g_cond_broadcast (GST_PAD_GET_PREROLL_COND (pad));
730 #define GST_PAD_BLOCK_GET_COND(pad) (GST_PAD_CAST(pad)->block_cond)
731 #define GST_PAD_BLOCK_WAIT(pad) (g_cond_wait(GST_PAD_BLOCK_GET_COND (pad), GST_OBJECT_GET_LOCK (pad)))
732 #define GST_PAD_BLOCK_SIGNAL(pad) (g_cond_signal(GST_PAD_BLOCK_GET_COND (pad)))
733 #define GST_PAD_BLOCK_BROADCAST(pad) (g_cond_broadcast(GST_PAD_BLOCK_GET_COND (pad)))
735 /* FIXME: this awful circular dependency need to be resolved properly (see padtemplate.h) */
736 #include <gst/gstpadtemplate.h>
738 GType gst_pad_get_type (void);
741 GstPad* gst_pad_new (const gchar *name, GstPadDirection direction);
742 GstPad* gst_pad_new_from_template (GstPadTemplate *templ, const gchar *name);
743 GstPad* gst_pad_new_from_static_template (GstStaticPadTemplate *templ, const gchar *name);
748 * @pad: the pad to get the name from
750 * Get a copy of the name of the pad. g_free() after usage.
754 #define gst_pad_get_name(pad) gst_object_get_name (GST_OBJECT_CAST (pad))
756 * gst_pad_get_parent:
757 * @pad: the pad to get the parent of
759 * Get the parent of @pad. This function increases the refcount
760 * of the parent object so you should gst_object_unref() it after usage.
761 * Can return NULL if the pad did not have a parent.
765 #define gst_pad_get_parent(pad) gst_object_get_parent (GST_OBJECT_CAST (pad))
767 GstPadDirection gst_pad_get_direction (GstPad *pad);
769 gboolean gst_pad_set_active (GstPad *pad, gboolean active);
770 gboolean gst_pad_is_active (GstPad *pad);
771 gboolean gst_pad_activate_pull (GstPad *pad, gboolean active);
772 gboolean gst_pad_activate_push (GstPad *pad, gboolean active);
774 gboolean gst_pad_set_blocked (GstPad *pad, gboolean blocked);
775 gboolean gst_pad_set_blocked_async (GstPad *pad, gboolean blocked,
776 GstPadBlockCallback callback, gpointer user_data);
777 gboolean gst_pad_is_blocked (GstPad *pad);
778 gboolean gst_pad_is_blocking (GstPad *pad);
780 void gst_pad_set_element_private (GstPad *pad, gpointer priv);
781 gpointer gst_pad_get_element_private (GstPad *pad);
783 GstPadTemplate* gst_pad_get_pad_template (GstPad *pad);
785 void gst_pad_set_bufferalloc_function (GstPad *pad, GstPadBufferAllocFunction bufalloc);
786 GstFlowReturn gst_pad_alloc_buffer (GstPad *pad, guint64 offset, gint size,
787 GstCaps *caps, GstBuffer **buf);
788 GstFlowReturn gst_pad_alloc_buffer_and_set_caps (GstPad *pad, guint64 offset, gint size,
789 GstCaps *caps, GstBuffer **buf);
791 /* data passing setup functions */
792 void gst_pad_set_activate_function (GstPad *pad, GstPadActivateFunction activate);
793 void gst_pad_set_activatepull_function (GstPad *pad, GstPadActivateModeFunction activatepull);
794 void gst_pad_set_activatepush_function (GstPad *pad, GstPadActivateModeFunction activatepush);
795 void gst_pad_set_chain_function (GstPad *pad, GstPadChainFunction chain);
796 void gst_pad_set_getrange_function (GstPad *pad, GstPadGetRangeFunction get);
797 void gst_pad_set_checkgetrange_function (GstPad *pad, GstPadCheckGetRangeFunction check);
798 void gst_pad_set_event_function (GstPad *pad, GstPadEventFunction event);
801 void gst_pad_set_link_function (GstPad *pad, GstPadLinkFunction link);
802 void gst_pad_set_unlink_function (GstPad *pad, GstPadUnlinkFunction unlink);
804 GstPadLinkReturn gst_pad_link (GstPad *srcpad, GstPad *sinkpad);
805 gboolean gst_pad_unlink (GstPad *srcpad, GstPad *sinkpad);
806 gboolean gst_pad_is_linked (GstPad *pad);
808 GstPad* gst_pad_get_peer (GstPad *pad);
810 /* capsnego functions */
811 void gst_pad_set_getcaps_function (GstPad *pad, GstPadGetCapsFunction getcaps);
812 void gst_pad_set_acceptcaps_function (GstPad *pad, GstPadAcceptCapsFunction acceptcaps);
813 void gst_pad_set_fixatecaps_function (GstPad *pad, GstPadFixateCapsFunction fixatecaps);
814 void gst_pad_set_setcaps_function (GstPad *pad, GstPadSetCapsFunction setcaps);
816 G_CONST_RETURN GstCaps* gst_pad_get_pad_template_caps (GstPad *pad);
818 /* capsnego function for connected/unconnected pads */
819 GstCaps * gst_pad_get_caps (GstPad * pad);
820 void gst_pad_fixate_caps (GstPad * pad, GstCaps *caps);
821 gboolean gst_pad_accept_caps (GstPad * pad, GstCaps *caps);
822 gboolean gst_pad_set_caps (GstPad * pad, GstCaps *caps);
824 GstCaps * gst_pad_peer_get_caps (GstPad * pad);
825 gboolean gst_pad_peer_accept_caps (GstPad * pad, GstCaps *caps);
827 /* capsnego for connected pads */
828 GstCaps * gst_pad_get_allowed_caps (GstPad * srcpad);
829 GstCaps * gst_pad_get_negotiated_caps (GstPad * pad);
831 /* data passing functions to peer */
832 GstFlowReturn gst_pad_push (GstPad *pad, GstBuffer *buffer);
833 gboolean gst_pad_check_pull_range (GstPad *pad);
834 GstFlowReturn gst_pad_pull_range (GstPad *pad, guint64 offset, guint size,
836 gboolean gst_pad_push_event (GstPad *pad, GstEvent *event);
837 gboolean gst_pad_event_default (GstPad *pad, GstEvent *event);
839 /* data passing functions on pad */
840 GstFlowReturn gst_pad_chain (GstPad *pad, GstBuffer *buffer);
841 GstFlowReturn gst_pad_get_range (GstPad *pad, guint64 offset, guint size,
843 gboolean gst_pad_send_event (GstPad *pad, GstEvent *event);
846 gboolean gst_pad_start_task (GstPad *pad, GstTaskFunction func,
848 gboolean gst_pad_pause_task (GstPad *pad);
849 gboolean gst_pad_stop_task (GstPad *pad);
852 void gst_pad_set_internal_link_function (GstPad *pad, GstPadIntLinkFunction intlink);
853 GList* gst_pad_get_internal_links (GstPad *pad);
854 GList* gst_pad_get_internal_links_default (GstPad *pad);
856 /* generic query function */
857 void gst_pad_set_query_type_function (GstPad *pad, GstPadQueryTypeFunction type_func);
858 G_CONST_RETURN GstQueryType*
859 gst_pad_get_query_types (GstPad *pad);
860 G_CONST_RETURN GstQueryType*
861 gst_pad_get_query_types_default (GstPad *pad);
863 gboolean gst_pad_query (GstPad *pad, GstQuery *query);
864 void gst_pad_set_query_function (GstPad *pad, GstPadQueryFunction query);
865 gboolean gst_pad_query_default (GstPad *pad, GstQuery *query);
867 /* misc helper functions */
868 gboolean gst_pad_dispatcher (GstPad *pad, GstPadDispatcherFunction dispatch,
871 #ifndef GST_DISABLE_LOADSAVE
872 void gst_pad_load_and_link (xmlNodePtr self, GstObject *parent);
877 #endif /* __GST_PAD_H__ */