2 * Copyright (C) 2004 Wim Taymans <wim@fluendo.com>
4 * gstmessage.c: GstMessage subsystem
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Library General Public License for more details.
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the
18 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 * Boston, MA 02111-1307, USA.
24 * @short_description: Lightweight objects to signal the application of
26 * @see_also: #GstBus, #GstMiniObject, #GstElement
28 * Messages are implemented as a subclass of #GstMiniObject with a generic
29 * #GstStructure as the content. This allows for writing custom messages without
30 * requiring an API change while allowing a wide range of different types
33 * Messages are posted by objects in the pipeline and are passed to the
34 * application using the #GstBus.
36 * The basic use pattern of posting a message on a #GstBus is as follows:
39 * <title>Posting a #GstMessage</title>
41 * gst_bus_post (bus, gst_message_new_eos());
45 * A #GstElement usually posts messages on the bus provided by the parent
46 * container using gst_element_post_message().
48 * Last reviewed on 2005-11-09 (0.9.4)
52 #include "gst_private.h"
53 #include <string.h> /* memcpy */
55 #include "gstenumtypes.h"
57 #include "gstmessage.h"
58 #include "gsttaglist.h"
67 GstStructure *structure;
70 #define GST_MESSAGE_STRUCTURE(m) (((GstMessageImpl *)(m))->structure)
79 static GstMessageQuarks message_quarks[] = {
80 {GST_MESSAGE_UNKNOWN, "unknown", 0},
81 {GST_MESSAGE_EOS, "eos", 0},
82 {GST_MESSAGE_ERROR, "error", 0},
83 {GST_MESSAGE_WARNING, "warning", 0},
84 {GST_MESSAGE_INFO, "info", 0},
85 {GST_MESSAGE_TAG, "tag", 0},
86 {GST_MESSAGE_BUFFERING, "buffering", 0},
87 {GST_MESSAGE_STATE_CHANGED, "state-changed", 0},
88 {GST_MESSAGE_STATE_DIRTY, "state-dirty", 0},
89 {GST_MESSAGE_STEP_DONE, "step-done", 0},
90 {GST_MESSAGE_CLOCK_PROVIDE, "clock-provide", 0},
91 {GST_MESSAGE_CLOCK_LOST, "clock-lost", 0},
92 {GST_MESSAGE_NEW_CLOCK, "new-clock", 0},
93 {GST_MESSAGE_STRUCTURE_CHANGE, "structure-change", 0},
94 {GST_MESSAGE_STREAM_STATUS, "stream-status", 0},
95 {GST_MESSAGE_APPLICATION, "application", 0},
96 {GST_MESSAGE_ELEMENT, "element", 0},
97 {GST_MESSAGE_SEGMENT_START, "segment-start", 0},
98 {GST_MESSAGE_SEGMENT_DONE, "segment-done", 0},
99 {GST_MESSAGE_DURATION, "duration", 0},
100 {GST_MESSAGE_LATENCY, "latency", 0},
101 {GST_MESSAGE_ASYNC_START, "async-start", 0},
102 {GST_MESSAGE_ASYNC_DONE, "async-done", 0},
103 {GST_MESSAGE_REQUEST_STATE, "request-state", 0},
104 {GST_MESSAGE_STEP_START, "step-start", 0},
105 {GST_MESSAGE_QOS, "qos", 0},
106 {GST_MESSAGE_PROGRESS, "progress", 0},
107 {GST_MESSAGE_TOC, "toc", 0},
108 {GST_MESSAGE_STREAM_START, "stream-start", 0},
112 static GType _gst_message_type = 0;
113 GST_DEFINE_MINI_OBJECT_TYPE (GstMessage, gst_message);
116 _priv_gst_message_initialize (void)
120 GST_CAT_INFO (GST_CAT_GST_INIT, "init messages");
122 /* the GstMiniObject types need to be class_ref'd once before it can be
123 * done from multiple threads;
124 * see http://bugzilla.gnome.org/show_bug.cgi?id=304551 */
125 gst_message_get_type ();
127 for (i = 0; message_quarks[i].name; i++) {
128 message_quarks[i].quark =
129 g_quark_from_static_string (message_quarks[i].name);
132 _gst_message_type = gst_message_get_type ();
136 * gst_message_type_get_name:
137 * @type: the message type
139 * Get a printable name for the given message type. Do not modify or free.
141 * Returns: a reference to the static name of the message.
144 gst_message_type_get_name (GstMessageType type)
148 for (i = 0; message_quarks[i].name; i++) {
149 if (type == message_quarks[i].type)
150 return message_quarks[i].name;
156 * gst_message_type_to_quark:
157 * @type: the message type
159 * Get the unique quark for the given message type.
161 * Returns: the quark associated with the message type
164 gst_message_type_to_quark (GstMessageType type)
168 for (i = 0; message_quarks[i].name; i++) {
169 if (type == message_quarks[i].type)
170 return message_quarks[i].quark;
176 _gst_message_free (GstMessage * message)
178 GstStructure *structure;
180 g_return_if_fail (message != NULL);
182 GST_CAT_LOG (GST_CAT_MESSAGE, "finalize message %p, %s from %s", message,
183 GST_MESSAGE_TYPE_NAME (message), GST_MESSAGE_SRC_NAME (message));
185 if (GST_MESSAGE_SRC (message)) {
186 gst_object_unref (GST_MESSAGE_SRC (message));
187 GST_MESSAGE_SRC (message) = NULL;
190 if (message->lock.p) {
191 GST_MESSAGE_LOCK (message);
192 GST_MESSAGE_SIGNAL (message);
193 GST_MESSAGE_UNLOCK (message);
196 structure = GST_MESSAGE_STRUCTURE (message);
198 gst_structure_set_parent_refcount (structure, NULL);
199 gst_structure_free (structure);
202 g_slice_free1 (sizeof (GstMessageImpl), message);
206 gst_message_init (GstMessageImpl * message, GstMessageType type,
210 _gst_message_copy (GstMessage * message)
212 GstMessageImpl *copy;
213 GstStructure *structure;
215 GST_CAT_LOG (GST_CAT_MESSAGE, "copy message %p, %s from %s", message,
216 GST_MESSAGE_TYPE_NAME (message),
217 GST_OBJECT_NAME (GST_MESSAGE_SRC (message)));
219 copy = g_slice_new0 (GstMessageImpl);
221 gst_message_init (copy, GST_MESSAGE_TYPE (message),
222 GST_MESSAGE_SRC (message));
224 GST_MESSAGE_TIMESTAMP (copy) = GST_MESSAGE_TIMESTAMP (message);
225 GST_MESSAGE_SEQNUM (copy) = GST_MESSAGE_SEQNUM (message);
227 structure = GST_MESSAGE_STRUCTURE (message);
229 GST_MESSAGE_STRUCTURE (copy) = gst_structure_copy (structure);
230 gst_structure_set_parent_refcount (GST_MESSAGE_STRUCTURE (copy),
231 ©->message.mini_object.refcount);
233 GST_MESSAGE_STRUCTURE (copy) = NULL;
236 return GST_MESSAGE_CAST (copy);
240 gst_message_init (GstMessageImpl * message, GstMessageType type,
243 gst_mini_object_init (GST_MINI_OBJECT_CAST (message), 0, _gst_message_type,
244 (GstMiniObjectCopyFunction) _gst_message_copy, NULL,
245 (GstMiniObjectFreeFunction) _gst_message_free);
247 GST_MESSAGE_TYPE (message) = type;
249 gst_object_ref (src);
250 GST_MESSAGE_SRC (message) = src;
251 GST_MESSAGE_TIMESTAMP (message) = GST_CLOCK_TIME_NONE;
252 GST_MESSAGE_SEQNUM (message) = gst_util_seqnum_next ();
257 * gst_message_new_custom:
258 * @type: The #GstMessageType to distinguish messages
259 * @src: The object originating the message.
260 * @structure: (transfer full): the structure for the message. The message
261 * will take ownership of the structure.
263 * Create a new custom-typed message. This can be used for anything not
264 * handled by other message-specific functions to pass a message to the
265 * app. The structure field can be NULL.
267 * Returns: (transfer full): The new message.
272 gst_message_new_custom (GstMessageType type, GstObject * src,
273 GstStructure * structure)
275 GstMessageImpl *message;
277 message = g_slice_new0 (GstMessageImpl);
279 GST_CAT_LOG (GST_CAT_MESSAGE, "source %s: creating new message %p %s",
280 (src ? GST_OBJECT_NAME (src) : "NULL"), message,
281 gst_message_type_get_name (type));
284 /* structure must not have a parent */
285 if (!gst_structure_set_parent_refcount (structure,
286 &message->message.mini_object.refcount))
289 gst_message_init (message, type, src);
291 GST_MESSAGE_STRUCTURE (message) = structure;
293 return GST_MESSAGE_CAST (message);
298 g_slice_free1 (sizeof (GstMessageImpl), message);
299 g_warning ("structure is already owned by another object");
305 * gst_message_get_seqnum:
306 * @message: A #GstMessage.
308 * Retrieve the sequence number of a message.
310 * Messages have ever-incrementing sequence numbers, which may also be set
311 * explicitly via gst_message_set_seqnum(). Sequence numbers are typically used
312 * to indicate that a message corresponds to some other set of messages or
313 * events, for example a SEGMENT_DONE message corresponding to a SEEK event. It
314 * is considered good practice to make this correspondence when possible, though
315 * it is not required.
317 * Note that events and messages share the same sequence number incrementor;
318 * two events or messages will never have the same sequence number unless
319 * that correspondence was made explicitly.
321 * Returns: The message's sequence number.
326 gst_message_get_seqnum (GstMessage * message)
328 g_return_val_if_fail (GST_IS_MESSAGE (message), -1);
330 return GST_MESSAGE_SEQNUM (message);
334 * gst_message_set_seqnum:
335 * @message: A #GstMessage.
336 * @seqnum: A sequence number.
338 * Set the sequence number of a message.
340 * This function might be called by the creator of a message to indicate that
341 * the message relates to other messages or events. See gst_message_get_seqnum()
342 * for more information.
347 gst_message_set_seqnum (GstMessage * message, guint32 seqnum)
349 g_return_if_fail (GST_IS_MESSAGE (message));
351 GST_MESSAGE_SEQNUM (message) = seqnum;
355 * gst_message_new_eos:
356 * @src: (transfer none): The object originating the message.
358 * Create a new eos message. This message is generated and posted in
359 * the sink elements of a GstBin. The bin will only forward the EOS
360 * message to the application if all sinks have posted an EOS message.
362 * Returns: (transfer full): The new eos message.
367 gst_message_new_eos (GstObject * src)
371 message = gst_message_new_custom (GST_MESSAGE_EOS, src, NULL);
377 * gst_message_new_error:
378 * @src: (transfer none): The object originating the message.
379 * @error: (transfer none): The GError for this message.
380 * @debug: A debugging string.
382 * Create a new error message. The message will copy @error and
383 * @debug. This message is posted by element when a fatal event
384 * occured. The pipeline will probably (partially) stop. The application
385 * receiving this message should stop the pipeline.
387 * Returns: (transfer full): the new error message.
392 gst_message_new_error (GstObject * src, GError * error, const gchar * debug)
395 GstStructure *structure;
397 structure = gst_structure_new_id (GST_QUARK (MESSAGE_ERROR),
398 GST_QUARK (GERROR), G_TYPE_ERROR, error,
399 GST_QUARK (DEBUG), G_TYPE_STRING, debug, NULL);
400 message = gst_message_new_custom (GST_MESSAGE_ERROR, src, structure);
406 * gst_message_new_warning:
407 * @src: (transfer none): The object originating the message.
408 * @error: (transfer none): The GError for this message.
409 * @debug: A debugging string.
411 * Create a new warning message. The message will make copies of @error and
414 * Returns: (transfer full): The new warning message.
419 gst_message_new_warning (GstObject * src, GError * error, const gchar * debug)
422 GstStructure *structure;
424 structure = gst_structure_new_id (GST_QUARK (MESSAGE_WARNING),
425 GST_QUARK (GERROR), G_TYPE_ERROR, error,
426 GST_QUARK (DEBUG), G_TYPE_STRING, debug, NULL);
427 message = gst_message_new_custom (GST_MESSAGE_WARNING, src, structure);
433 * gst_message_new_info:
434 * @src: (transfer none): The object originating the message.
435 * @error: (transfer none): The GError for this message.
436 * @debug: A debugging string.
438 * Create a new info message. The message will make copies of @error and
443 * Returns: (transfer full): the new info message.
446 gst_message_new_info (GstObject * src, GError * error, const gchar * debug)
449 GstStructure *structure;
451 structure = gst_structure_new_id (GST_QUARK (MESSAGE_INFO),
452 GST_QUARK (GERROR), G_TYPE_ERROR, error,
453 GST_QUARK (DEBUG), G_TYPE_STRING, debug, NULL);
454 message = gst_message_new_custom (GST_MESSAGE_INFO, src, structure);
460 * gst_message_new_tag:
461 * @src: (transfer none): The object originating the message.
462 * @tag_list: (transfer full): the tag list for the message.
464 * Create a new tag message. The message will take ownership of the tag list.
465 * The message is posted by elements that discovered a new taglist.
467 * Returns: (transfer full): the new tag message.
472 gst_message_new_tag (GstObject * src, GstTagList * tag_list)
476 GValue val = G_VALUE_INIT;
478 g_return_val_if_fail (GST_IS_TAG_LIST (tag_list), NULL);
480 s = gst_structure_new_id_empty (GST_QUARK (MESSAGE_TAG));
481 g_value_init (&val, GST_TYPE_TAG_LIST);
482 g_value_take_boxed (&val, tag_list);
483 gst_structure_id_take_value (s, GST_QUARK (TAGLIST), &val);
484 message = gst_message_new_custom (GST_MESSAGE_TAG, src, s);
489 * gst_message_new_buffering:
490 * @src: (transfer none): The object originating the message.
491 * @percent: The buffering percent
493 * Create a new buffering message. This message can be posted by an element that
494 * needs to buffer data before it can continue processing. @percent should be a
495 * value between 0 and 100. A value of 100 means that the buffering completed.
497 * When @percent is < 100 the application should PAUSE a PLAYING pipeline. When
498 * @percent is 100, the application can set the pipeline (back) to PLAYING.
499 * The application must be prepared to receive BUFFERING messages in the
500 * PREROLLING state and may only set the pipeline to PLAYING after receiving a
501 * message with @percent set to 100, which can happen after the pipeline
502 * completed prerolling.
506 * Returns: (transfer full): The new buffering message.
509 gst_message_new_buffering (GstObject * src, gint percent)
512 GstStructure *structure;
513 gint64 buffering_left;
515 g_return_val_if_fail (percent >= 0 && percent <= 100, NULL);
517 buffering_left = (percent == 100 ? 0 : -1);
519 structure = gst_structure_new_id (GST_QUARK (MESSAGE_BUFFERING),
520 GST_QUARK (BUFFER_PERCENT), G_TYPE_INT, percent,
521 GST_QUARK (BUFFERING_MODE), GST_TYPE_BUFFERING_MODE, GST_BUFFERING_STREAM,
522 GST_QUARK (AVG_IN_RATE), G_TYPE_INT, -1,
523 GST_QUARK (AVG_OUT_RATE), G_TYPE_INT, -1,
524 GST_QUARK (BUFFERING_LEFT), G_TYPE_INT64, buffering_left, NULL);
525 message = gst_message_new_custom (GST_MESSAGE_BUFFERING, src, structure);
531 * gst_message_new_state_changed:
532 * @src: (transfer none): the object originating the message
533 * @oldstate: the previous state
534 * @newstate: the new (current) state
535 * @pending: the pending (target) state
537 * Create a state change message. This message is posted whenever an element
540 * Returns: (transfer full): the new state change message.
545 gst_message_new_state_changed (GstObject * src,
546 GstState oldstate, GstState newstate, GstState pending)
549 GstStructure *structure;
551 structure = gst_structure_new_id (GST_QUARK (MESSAGE_STATE_CHANGED),
552 GST_QUARK (OLD_STATE), GST_TYPE_STATE, (gint) oldstate,
553 GST_QUARK (NEW_STATE), GST_TYPE_STATE, (gint) newstate,
554 GST_QUARK (PENDING_STATE), GST_TYPE_STATE, (gint) pending, NULL);
555 message = gst_message_new_custom (GST_MESSAGE_STATE_CHANGED, src, structure);
561 * gst_message_new_state_dirty:
562 * @src: (transfer none): the object originating the message
564 * Create a state dirty message. This message is posted whenever an element
565 * changed its state asynchronously and is used internally to update the
566 * states of container objects.
568 * Returns: (transfer full): the new state dirty message.
573 gst_message_new_state_dirty (GstObject * src)
577 message = gst_message_new_custom (GST_MESSAGE_STATE_DIRTY, src, NULL);
583 * gst_message_new_clock_provide:
584 * @src: (transfer none): the object originating the message.
585 * @clock: (transfer none): the clock it provides
586 * @ready: TRUE if the sender can provide a clock
588 * Create a clock provide message. This message is posted whenever an
589 * element is ready to provide a clock or lost its ability to provide
590 * a clock (maybe because it paused or became EOS).
592 * This message is mainly used internally to manage the clock
595 * Returns: (transfer full): the new provide clock message.
600 gst_message_new_clock_provide (GstObject * src, GstClock * clock,
604 GstStructure *structure;
606 structure = gst_structure_new_id (GST_QUARK (MESSAGE_CLOCK_PROVIDE),
607 GST_QUARK (CLOCK), GST_TYPE_CLOCK, clock,
608 GST_QUARK (READY), G_TYPE_BOOLEAN, ready, NULL);
609 message = gst_message_new_custom (GST_MESSAGE_CLOCK_PROVIDE, src, structure);
615 * gst_message_new_clock_lost:
616 * @src: (transfer none): the object originating the message.
617 * @clock: (transfer none): the clock that was lost
619 * Create a clock lost message. This message is posted whenever the
620 * clock is not valid anymore.
622 * If this message is posted by the pipeline, the pipeline will
623 * select a new clock again when it goes to PLAYING. It might therefore
624 * be needed to set the pipeline to PAUSED and PLAYING again.
626 * Returns: (transfer full): The new clock lost message.
631 gst_message_new_clock_lost (GstObject * src, GstClock * clock)
634 GstStructure *structure;
636 structure = gst_structure_new_id (GST_QUARK (MESSAGE_CLOCK_LOST),
637 GST_QUARK (CLOCK), GST_TYPE_CLOCK, clock, NULL);
638 message = gst_message_new_custom (GST_MESSAGE_CLOCK_LOST, src, structure);
644 * gst_message_new_new_clock:
645 * @src: (transfer none): The object originating the message.
646 * @clock: (transfer none): the new selected clock
648 * Create a new clock message. This message is posted whenever the
649 * pipeline selectes a new clock for the pipeline.
651 * Returns: (transfer full): The new new clock message.
656 gst_message_new_new_clock (GstObject * src, GstClock * clock)
659 GstStructure *structure;
661 structure = gst_structure_new_id (GST_QUARK (MESSAGE_NEW_CLOCK),
662 GST_QUARK (CLOCK), GST_TYPE_CLOCK, clock, NULL);
663 message = gst_message_new_custom (GST_MESSAGE_NEW_CLOCK, src, structure);
669 * gst_message_new_structure_change:
670 * @src: (transfer none): The object originating the message.
671 * @type: The change type.
672 * @owner: (transfer none): The owner element of @src.
673 * @busy: Whether the structure change is busy.
675 * Create a new structure change message. This message is posted when the
676 * structure of a pipeline is in the process of being changed, for example
677 * when pads are linked or unlinked.
679 * @src should be the sinkpad that unlinked or linked.
681 * Returns: (transfer full): the new structure change message.
686 gst_message_new_structure_change (GstObject * src, GstStructureChangeType type,
687 GstElement * owner, gboolean busy)
690 GstStructure *structure;
692 g_return_val_if_fail (GST_IS_PAD (src), NULL);
693 /* g_return_val_if_fail (GST_PAD_DIRECTION (src) == GST_PAD_SINK, NULL); */
694 g_return_val_if_fail (GST_IS_ELEMENT (owner), NULL);
696 structure = gst_structure_new_id (GST_QUARK (MESSAGE_STRUCTURE_CHANGE),
697 GST_QUARK (TYPE), GST_TYPE_STRUCTURE_CHANGE_TYPE, type,
698 GST_QUARK (OWNER), GST_TYPE_ELEMENT, owner,
699 GST_QUARK (BUSY), G_TYPE_BOOLEAN, busy, NULL);
701 message = gst_message_new_custom (GST_MESSAGE_STRUCTURE_CHANGE, src,
708 * gst_message_new_segment_start:
709 * @src: (transfer none): The object originating the message.
710 * @format: The format of the position being played
711 * @position: The position of the segment being played
713 * Create a new segment message. This message is posted by elements that
714 * start playback of a segment as a result of a segment seek. This message
715 * is not received by the application but is used for maintenance reasons in
716 * container elements.
718 * Returns: (transfer full): the new segment start message.
723 gst_message_new_segment_start (GstObject * src, GstFormat format,
727 GstStructure *structure;
729 structure = gst_structure_new_id (GST_QUARK (MESSAGE_SEGMENT_START),
730 GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
731 GST_QUARK (POSITION), G_TYPE_INT64, position, NULL);
732 message = gst_message_new_custom (GST_MESSAGE_SEGMENT_START, src, structure);
738 * gst_message_new_segment_done:
739 * @src: (transfer none): the object originating the message.
740 * @format: The format of the position being done
741 * @position: The position of the segment being done
743 * Create a new segment done message. This message is posted by elements that
744 * finish playback of a segment as a result of a segment seek. This message
745 * is received by the application after all elements that posted a segment_start
746 * have posted the segment_done.
748 * Returns: (transfer full): the new segment done message.
753 gst_message_new_segment_done (GstObject * src, GstFormat format,
757 GstStructure *structure;
759 structure = gst_structure_new_id (GST_QUARK (MESSAGE_SEGMENT_DONE),
760 GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
761 GST_QUARK (POSITION), G_TYPE_INT64, position, NULL);
762 message = gst_message_new_custom (GST_MESSAGE_SEGMENT_DONE, src, structure);
768 * gst_message_new_application:
769 * @src: (transfer none): the object originating the message.
770 * @structure: (transfer full): the structure for the message. The message
771 * will take ownership of the structure.
773 * Create a new application-typed message. GStreamer will never create these
774 * messages; they are a gift from us to you. Enjoy.
776 * Returns: (transfer full): The new application message.
781 gst_message_new_application (GstObject * src, GstStructure * structure)
783 return gst_message_new_custom (GST_MESSAGE_APPLICATION, src, structure);
787 * gst_message_new_element:
788 * @src: (transfer none): The object originating the message.
789 * @structure: (transfer full): The structure for the message. The message
790 * will take ownership of the structure.
792 * Create a new element-specific message. This is meant as a generic way of
793 * allowing one-way communication from an element to an application, for example
794 * "the firewire cable was unplugged". The format of the message should be
795 * documented in the element's documentation. The structure field can be NULL.
797 * Returns: (transfer full): The new element message.
802 gst_message_new_element (GstObject * src, GstStructure * structure)
804 return gst_message_new_custom (GST_MESSAGE_ELEMENT, src, structure);
808 * gst_message_new_duration:
809 * @src: (transfer none): The object originating the message.
810 * @format: The format of the duration
811 * @duration: The new duration
813 * Create a new duration message. This message is posted by elements that
814 * know the duration of a stream in a specific format. This message
815 * is received by bins and is used to calculate the total duration of a
816 * pipeline. Elements may post a duration message with a duration of
817 * GST_CLOCK_TIME_NONE to indicate that the duration has changed and the
818 * cached duration should be discarded. The new duration can then be
819 * retrieved via a query.
821 * Returns: (transfer full): The new duration message.
826 gst_message_new_duration (GstObject * src, GstFormat format, gint64 duration)
829 GstStructure *structure;
831 structure = gst_structure_new_id (GST_QUARK (MESSAGE_DURATION),
832 GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
833 GST_QUARK (DURATION), G_TYPE_INT64, duration, NULL);
834 message = gst_message_new_custom (GST_MESSAGE_DURATION, src, structure);
840 * gst_message_new_async_start:
841 * @src: (transfer none): The object originating the message.
843 * This message is posted by elements when they start an ASYNC state change.
845 * Returns: (transfer full): The new async_start message.
850 gst_message_new_async_start (GstObject * src)
854 message = gst_message_new_custom (GST_MESSAGE_ASYNC_START, src, NULL);
860 * gst_message_new_async_done:
861 * @src: (transfer none): The object originating the message.
862 * @running_time: the desired running_time
864 * The message is posted when elements completed an ASYNC state change.
865 * @running_time contains the time of the desired running_time when this
866 * elements goes to PLAYING. A value of #GST_CLOCK_TIME_NONE for @running_time
867 * means that the element has no clock interaction and thus doesn't care about
868 * the running_time of the pipeline.
870 * Returns: (transfer full): The new async_done message.
875 gst_message_new_async_done (GstObject * src, GstClockTime running_time)
878 GstStructure *structure;
880 structure = gst_structure_new_id (GST_QUARK (MESSAGE_ASYNC_DONE),
881 GST_QUARK (RUNNING_TIME), G_TYPE_UINT64, running_time, NULL);
882 message = gst_message_new_custom (GST_MESSAGE_ASYNC_DONE, src, structure);
888 * gst_message_new_latency:
889 * @src: (transfer none): The object originating the message.
891 * This message can be posted by elements when their latency requirements have
894 * Returns: (transfer full): The new latency message.
899 gst_message_new_latency (GstObject * src)
903 message = gst_message_new_custom (GST_MESSAGE_LATENCY, src, NULL);
909 * gst_message_new_request_state:
910 * @src: (transfer none): the object originating the message.
911 * @state: The new requested state
913 * This message can be posted by elements when they want to have their state
914 * changed. A typical use case would be an audio server that wants to pause the
915 * pipeline because a higher priority stream is being played.
917 * Returns: (transfer full): the new requst state message.
922 gst_message_new_request_state (GstObject * src, GstState state)
925 GstStructure *structure;
927 structure = gst_structure_new_id (GST_QUARK (MESSAGE_REQUEST_STATE),
928 GST_QUARK (NEW_STATE), GST_TYPE_STATE, (gint) state, NULL);
929 message = gst_message_new_custom (GST_MESSAGE_REQUEST_STATE, src, structure);
935 * gst_message_get_structure:
936 * @message: The #GstMessage.
938 * Access the structure of the message.
940 * Returns: (transfer none): The structure of the message. The structure is
941 * still owned by the message, which means that you should not free it and
942 * that the pointer becomes invalid when you free the message.
947 gst_message_get_structure (GstMessage * message)
949 g_return_val_if_fail (GST_IS_MESSAGE (message), NULL);
951 return GST_MESSAGE_STRUCTURE (message);
955 * gst_message_has_name:
956 * @message: The #GstMessage.
957 * @name: name to check
959 * Checks if @message has the given @name. This function is usually used to
960 * check the name of a custom message.
962 * Returns: %TRUE if @name matches the name of the message structure.
965 gst_message_has_name (GstMessage * message, const gchar * name)
967 GstStructure *structure;
969 g_return_val_if_fail (GST_IS_MESSAGE (message), FALSE);
971 structure = GST_MESSAGE_STRUCTURE (message);
972 if (structure == NULL)
975 return gst_structure_has_name (structure, name);
979 * gst_message_parse_tag:
980 * @message: A valid #GstMessage of type GST_MESSAGE_TAG.
981 * @tag_list: (out callee-allocates): return location for the tag-list.
983 * Extracts the tag list from the GstMessage. The tag list returned in the
984 * output argument is a copy; the caller must free it when done.
986 * Typical usage of this function might be:
989 * switch (GST_MESSAGE_TYPE (msg)) {
990 * case GST_MESSAGE_TAG: {
991 * GstTagList *tags = NULL;
993 * gst_message_parse_tag (msg, &tags);
994 * g_print ("Got tags from element %s\n", GST_OBJECT_NAME (msg->src));
995 * handle_tags (tags);
996 * gst_tag_list_unref (tags);
1007 gst_message_parse_tag (GstMessage * message, GstTagList ** tag_list)
1009 g_return_if_fail (GST_IS_MESSAGE (message));
1010 g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_TAG);
1011 g_return_if_fail (tag_list != NULL);
1013 gst_structure_id_get (GST_MESSAGE_STRUCTURE (message),
1014 GST_QUARK (TAGLIST), GST_TYPE_TAG_LIST, tag_list, NULL);
1018 * gst_message_parse_buffering:
1019 * @message: A valid #GstMessage of type GST_MESSAGE_BUFFERING.
1020 * @percent: (out) (allow-none): Return location for the percent.
1022 * Extracts the buffering percent from the GstMessage. see also
1023 * gst_message_new_buffering().
1028 gst_message_parse_buffering (GstMessage * message, gint * percent)
1030 g_return_if_fail (GST_IS_MESSAGE (message));
1031 g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_BUFFERING);
1035 g_value_get_int (gst_structure_id_get_value (GST_MESSAGE_STRUCTURE
1036 (message), GST_QUARK (BUFFER_PERCENT)));
1040 * gst_message_set_buffering_stats:
1041 * @message: A valid #GstMessage of type GST_MESSAGE_BUFFERING.
1042 * @mode: a buffering mode
1043 * @avg_in: the average input rate
1044 * @avg_out: the average output rate
1045 * @buffering_left: amount of buffering time left in milliseconds
1047 * Configures the buffering stats values in @message.
1050 gst_message_set_buffering_stats (GstMessage * message, GstBufferingMode mode,
1051 gint avg_in, gint avg_out, gint64 buffering_left)
1053 g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_BUFFERING);
1055 gst_structure_id_set (GST_MESSAGE_STRUCTURE (message),
1056 GST_QUARK (BUFFERING_MODE), GST_TYPE_BUFFERING_MODE, mode,
1057 GST_QUARK (AVG_IN_RATE), G_TYPE_INT, avg_in,
1058 GST_QUARK (AVG_OUT_RATE), G_TYPE_INT, avg_out,
1059 GST_QUARK (BUFFERING_LEFT), G_TYPE_INT64, buffering_left, NULL);
1063 * gst_message_parse_buffering_stats:
1064 * @message: A valid #GstMessage of type GST_MESSAGE_BUFFERING.
1065 * @mode: (out) (allow-none): a buffering mode, or NULL
1066 * @avg_in: (out) (allow-none): the average input rate, or NULL
1067 * @avg_out: (out) (allow-none): the average output rate, or NULL
1068 * @buffering_left: (out) (allow-none): amount of buffering time left in
1069 * milliseconds, or NULL
1071 * Extracts the buffering stats values from @message.
1074 gst_message_parse_buffering_stats (GstMessage * message,
1075 GstBufferingMode * mode, gint * avg_in, gint * avg_out,
1076 gint64 * buffering_left)
1078 GstStructure *structure;
1080 g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_BUFFERING);
1082 structure = GST_MESSAGE_STRUCTURE (message);
1084 *mode = (GstBufferingMode)
1085 g_value_get_enum (gst_structure_id_get_value (structure,
1086 GST_QUARK (BUFFERING_MODE)));
1088 *avg_in = g_value_get_int (gst_structure_id_get_value (structure,
1089 GST_QUARK (AVG_IN_RATE)));
1091 *avg_out = g_value_get_int (gst_structure_id_get_value (structure,
1092 GST_QUARK (AVG_OUT_RATE)));
1095 g_value_get_int64 (gst_structure_id_get_value (structure,
1096 GST_QUARK (BUFFERING_LEFT)));
1100 * gst_message_parse_state_changed:
1101 * @message: a valid #GstMessage of type GST_MESSAGE_STATE_CHANGED
1102 * @oldstate: (out) (allow-none): the previous state, or NULL
1103 * @newstate: (out) (allow-none): the new (current) state, or NULL
1104 * @pending: (out) (allow-none): the pending (target) state, or NULL
1106 * Extracts the old and new states from the GstMessage.
1108 * Typical usage of this function might be:
1111 * switch (GST_MESSAGE_TYPE (msg)) {
1112 * case GST_MESSAGE_STATE_CHANGED: {
1113 * GstState old_state, new_state;
1115 * gst_message_parse_state_changed (msg, &old_state, &new_state, NULL);
1116 * g_print ("Element %s changed state from %s to %s.\n",
1117 * GST_OBJECT_NAME (msg->src),
1118 * gst_element_state_get_name (old_state),
1119 * gst_element_state_get_name (new_state));
1130 gst_message_parse_state_changed (GstMessage * message,
1131 GstState * oldstate, GstState * newstate, GstState * pending)
1133 GstStructure *structure;
1135 g_return_if_fail (GST_IS_MESSAGE (message));
1136 g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_STATE_CHANGED);
1138 structure = GST_MESSAGE_STRUCTURE (message);
1140 *oldstate = (GstState)
1141 g_value_get_enum (gst_structure_id_get_value (structure,
1142 GST_QUARK (OLD_STATE)));
1144 *newstate = (GstState)
1145 g_value_get_enum (gst_structure_id_get_value (structure,
1146 GST_QUARK (NEW_STATE)));
1148 *pending = (GstState)
1149 g_value_get_enum (gst_structure_id_get_value (structure,
1150 GST_QUARK (PENDING_STATE)));
1154 * gst_message_parse_clock_provide:
1155 * @message: A valid #GstMessage of type GST_MESSAGE_CLOCK_PROVIDE.
1156 * @clock: (out) (allow-none) (transfer none): a pointer to hold a clock
1158 * @ready: (out) (allow-none): a pointer to hold the ready flag, or NULL
1160 * Extracts the clock and ready flag from the GstMessage.
1161 * The clock object returned remains valid until the message is freed.
1166 gst_message_parse_clock_provide (GstMessage * message, GstClock ** clock,
1169 const GValue *clock_gvalue;
1170 GstStructure *structure;
1172 g_return_if_fail (GST_IS_MESSAGE (message));
1173 g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_CLOCK_PROVIDE);
1175 structure = GST_MESSAGE_STRUCTURE (message);
1176 clock_gvalue = gst_structure_id_get_value (structure, GST_QUARK (CLOCK));
1177 g_return_if_fail (clock_gvalue != NULL);
1178 g_return_if_fail (G_VALUE_TYPE (clock_gvalue) == GST_TYPE_CLOCK);
1182 g_value_get_boolean (gst_structure_id_get_value (structure,
1183 GST_QUARK (READY)));
1185 *clock = (GstClock *) g_value_get_object (clock_gvalue);
1189 * gst_message_parse_clock_lost:
1190 * @message: A valid #GstMessage of type GST_MESSAGE_CLOCK_LOST.
1191 * @clock: (out) (allow-none) (transfer none): a pointer to hold the lost clock
1193 * Extracts the lost clock from the GstMessage.
1194 * The clock object returned remains valid until the message is freed.
1199 gst_message_parse_clock_lost (GstMessage * message, GstClock ** clock)
1201 const GValue *clock_gvalue;
1202 GstStructure *structure;
1204 g_return_if_fail (GST_IS_MESSAGE (message));
1205 g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_CLOCK_LOST);
1207 structure = GST_MESSAGE_STRUCTURE (message);
1208 clock_gvalue = gst_structure_id_get_value (structure, GST_QUARK (CLOCK));
1209 g_return_if_fail (clock_gvalue != NULL);
1210 g_return_if_fail (G_VALUE_TYPE (clock_gvalue) == GST_TYPE_CLOCK);
1213 *clock = (GstClock *) g_value_get_object (clock_gvalue);
1217 * gst_message_parse_new_clock:
1218 * @message: A valid #GstMessage of type GST_MESSAGE_NEW_CLOCK.
1219 * @clock: (out) (allow-none) (transfer none): a pointer to hold the selected
1222 * Extracts the new clock from the GstMessage.
1223 * The clock object returned remains valid until the message is freed.
1228 gst_message_parse_new_clock (GstMessage * message, GstClock ** clock)
1230 const GValue *clock_gvalue;
1231 GstStructure *structure;
1233 g_return_if_fail (GST_IS_MESSAGE (message));
1234 g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_NEW_CLOCK);
1236 structure = GST_MESSAGE_STRUCTURE (message);
1237 clock_gvalue = gst_structure_id_get_value (structure, GST_QUARK (CLOCK));
1238 g_return_if_fail (clock_gvalue != NULL);
1239 g_return_if_fail (G_VALUE_TYPE (clock_gvalue) == GST_TYPE_CLOCK);
1242 *clock = (GstClock *) g_value_get_object (clock_gvalue);
1246 * gst_message_parse_structure_change:
1247 * @message: A valid #GstMessage of type GST_MESSAGE_STRUCTURE_CHANGE.
1248 * @type: (out): A pointer to hold the change type
1249 * @owner: (out) (allow-none) (transfer none): The owner element of the
1251 * @busy: (out) (allow-none): a pointer to hold whether the change is in
1252 * progress or has been completed
1254 * Extracts the change type and completion status from the GstMessage.
1259 gst_message_parse_structure_change (GstMessage * message,
1260 GstStructureChangeType * type, GstElement ** owner, gboolean * busy)
1262 const GValue *owner_gvalue;
1263 GstStructure *structure;
1265 g_return_if_fail (GST_IS_MESSAGE (message));
1266 g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_STRUCTURE_CHANGE);
1268 structure = GST_MESSAGE_STRUCTURE (message);
1269 owner_gvalue = gst_structure_id_get_value (structure, GST_QUARK (OWNER));
1270 g_return_if_fail (owner_gvalue != NULL);
1271 g_return_if_fail (G_VALUE_TYPE (owner_gvalue) == GST_TYPE_ELEMENT);
1274 *type = (GstStructureChangeType)
1275 g_value_get_enum (gst_structure_id_get_value (structure,
1278 *owner = (GstElement *) g_value_get_object (owner_gvalue);
1281 g_value_get_boolean (gst_structure_id_get_value (structure,
1286 * gst_message_parse_error:
1287 * @message: A valid #GstMessage of type GST_MESSAGE_ERROR.
1288 * @gerror: (out) (allow-none) (transfer full): location for the GError
1289 * @debug: (out) (allow-none) (transfer full): location for the debug message,
1292 * Extracts the GError and debug string from the GstMessage. The values returned
1293 * in the output arguments are copies; the caller must free them when done.
1295 * Typical usage of this function might be:
1298 * switch (GST_MESSAGE_TYPE (msg)) {
1299 * case GST_MESSAGE_ERROR: {
1300 * GError *err = NULL;
1301 * gchar *dbg_info = NULL;
1303 * gst_message_parse_error (msg, &err, &dbg_info);
1304 * g_printerr ("ERROR from element %s: %s\n",
1305 * GST_OBJECT_NAME (msg->src), err->message);
1306 * g_printerr ("Debugging info: %s\n", (dbg_info) ? dbg_info : "none");
1307 * g_error_free (err);
1308 * g_free (dbg_info);
1319 gst_message_parse_error (GstMessage * message, GError ** gerror, gchar ** debug)
1321 const GValue *error_gvalue;
1323 GstStructure *structure;
1325 g_return_if_fail (GST_IS_MESSAGE (message));
1326 g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_ERROR);
1328 structure = GST_MESSAGE_STRUCTURE (message);
1329 error_gvalue = gst_structure_id_get_value (structure, GST_QUARK (GERROR));
1330 g_return_if_fail (error_gvalue != NULL);
1331 g_return_if_fail (G_VALUE_TYPE (error_gvalue) == G_TYPE_ERROR);
1333 error_val = (GError *) g_value_get_boxed (error_gvalue);
1335 *gerror = g_error_copy (error_val);
1341 g_value_dup_string (gst_structure_id_get_value (structure,
1342 GST_QUARK (DEBUG)));
1346 * gst_message_parse_warning:
1347 * @message: A valid #GstMessage of type GST_MESSAGE_WARNING.
1348 * @gerror: (out) (allow-none) (transfer full): location for the GError
1349 * @debug: (out) (allow-none) (transfer full): location for the debug message,
1352 * Extracts the GError and debug string from the GstMessage. The values returned
1353 * in the output arguments are copies; the caller must free them when done.
1358 gst_message_parse_warning (GstMessage * message, GError ** gerror,
1361 const GValue *error_gvalue;
1363 GstStructure *structure;
1365 g_return_if_fail (GST_IS_MESSAGE (message));
1366 g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_WARNING);
1368 structure = GST_MESSAGE_STRUCTURE (message);
1369 error_gvalue = gst_structure_id_get_value (structure, GST_QUARK (GERROR));
1370 g_return_if_fail (error_gvalue != NULL);
1371 g_return_if_fail (G_VALUE_TYPE (error_gvalue) == G_TYPE_ERROR);
1373 error_val = (GError *) g_value_get_boxed (error_gvalue);
1375 *gerror = g_error_copy (error_val);
1381 g_value_dup_string (gst_structure_id_get_value (structure,
1382 GST_QUARK (DEBUG)));
1386 * gst_message_parse_info:
1387 * @message: A valid #GstMessage of type GST_MESSAGE_INFO.
1388 * @gerror: (out) (allow-none) (transfer full): location for the GError
1389 * @debug: (out) (allow-none) (transfer full): location for the debug message,
1392 * Extracts the GError and debug string from the GstMessage. The values returned
1393 * in the output arguments are copies; the caller must free them when done.
1398 gst_message_parse_info (GstMessage * message, GError ** gerror, gchar ** debug)
1400 const GValue *error_gvalue;
1402 GstStructure *structure;
1404 g_return_if_fail (GST_IS_MESSAGE (message));
1405 g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_INFO);
1407 structure = GST_MESSAGE_STRUCTURE (message);
1408 error_gvalue = gst_structure_id_get_value (structure, GST_QUARK (GERROR));
1409 g_return_if_fail (error_gvalue != NULL);
1410 g_return_if_fail (G_VALUE_TYPE (error_gvalue) == G_TYPE_ERROR);
1412 error_val = (GError *) g_value_get_boxed (error_gvalue);
1414 *gerror = g_error_copy (error_val);
1420 g_value_dup_string (gst_structure_id_get_value (structure,
1421 GST_QUARK (DEBUG)));
1425 * gst_message_parse_segment_start:
1426 * @message: A valid #GstMessage of type GST_MESSAGE_SEGMENT_START.
1427 * @format: (out): Result location for the format, or NULL
1428 * @position: (out): Result location for the position, or NULL
1430 * Extracts the position and format from the segment start message.
1435 gst_message_parse_segment_start (GstMessage * message, GstFormat * format,
1438 GstStructure *structure;
1440 g_return_if_fail (GST_IS_MESSAGE (message));
1441 g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_SEGMENT_START);
1443 structure = GST_MESSAGE_STRUCTURE (message);
1445 *format = (GstFormat)
1446 g_value_get_enum (gst_structure_id_get_value (structure,
1447 GST_QUARK (FORMAT)));
1450 g_value_get_int64 (gst_structure_id_get_value (structure,
1451 GST_QUARK (POSITION)));
1455 * gst_message_parse_segment_done:
1456 * @message: A valid #GstMessage of type GST_MESSAGE_SEGMENT_DONE.
1457 * @format: (out): Result location for the format, or NULL
1458 * @position: (out): Result location for the position, or NULL
1460 * Extracts the position and format from the segment start message.
1465 gst_message_parse_segment_done (GstMessage * message, GstFormat * format,
1468 GstStructure *structure;
1470 g_return_if_fail (GST_IS_MESSAGE (message));
1471 g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_SEGMENT_DONE);
1473 structure = GST_MESSAGE_STRUCTURE (message);
1475 *format = (GstFormat)
1476 g_value_get_enum (gst_structure_id_get_value (structure,
1477 GST_QUARK (FORMAT)));
1480 g_value_get_int64 (gst_structure_id_get_value (structure,
1481 GST_QUARK (POSITION)));
1485 * gst_message_parse_duration:
1486 * @message: A valid #GstMessage of type GST_MESSAGE_DURATION.
1487 * @format: (out): Result location for the format, or NULL
1488 * @duration: (out): Result location for the duration, or NULL
1490 * Extracts the duration and format from the duration message. The duration
1491 * might be GST_CLOCK_TIME_NONE, which indicates that the duration has
1492 * changed. Applications should always use a query to retrieve the duration
1498 gst_message_parse_duration (GstMessage * message, GstFormat * format,
1501 GstStructure *structure;
1503 g_return_if_fail (GST_IS_MESSAGE (message));
1504 g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_DURATION);
1506 structure = GST_MESSAGE_STRUCTURE (message);
1508 *format = (GstFormat)
1509 g_value_get_enum (gst_structure_id_get_value (structure,
1510 GST_QUARK (FORMAT)));
1513 g_value_get_int64 (gst_structure_id_get_value (structure,
1514 GST_QUARK (DURATION)));
1518 * gst_message_parse_async_done:
1519 * @message: A valid #GstMessage of type GST_MESSAGE_ASYNC_DONE.
1520 * @running_time: (out): Result location for the running_time or NULL
1522 * Extract the running_time from the async_done message.
1527 gst_message_parse_async_done (GstMessage * message, GstClockTime * running_time)
1529 GstStructure *structure;
1531 g_return_if_fail (GST_IS_MESSAGE (message));
1532 g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_ASYNC_DONE);
1534 structure = GST_MESSAGE_STRUCTURE (message);
1537 g_value_get_uint64 (gst_structure_id_get_value (structure,
1538 GST_QUARK (RUNNING_TIME)));
1542 * gst_message_parse_request_state:
1543 * @message: A valid #GstMessage of type GST_MESSAGE_REQUEST_STATE.
1544 * @state: (out): Result location for the requested state or NULL
1546 * Extract the requested state from the request_state message.
1551 gst_message_parse_request_state (GstMessage * message, GstState * state)
1553 GstStructure *structure;
1555 g_return_if_fail (GST_IS_MESSAGE (message));
1556 g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_REQUEST_STATE);
1558 structure = GST_MESSAGE_STRUCTURE (message);
1561 g_value_get_enum (gst_structure_id_get_value (structure,
1562 GST_QUARK (NEW_STATE)));
1566 * gst_message_new_stream_status:
1567 * @src: The object originating the message.
1568 * @type: The stream status type.
1569 * @owner: (transfer none): the owner element of @src.
1571 * Create a new stream status message. This message is posted when a streaming
1572 * thread is created/destroyed or when the state changed.
1574 * Returns: (transfer full): the new stream status message.
1579 gst_message_new_stream_status (GstObject * src, GstStreamStatusType type,
1582 GstMessage *message;
1583 GstStructure *structure;
1585 structure = gst_structure_new_id (GST_QUARK (MESSAGE_STREAM_STATUS),
1586 GST_QUARK (TYPE), GST_TYPE_STREAM_STATUS_TYPE, (gint) type,
1587 GST_QUARK (OWNER), GST_TYPE_ELEMENT, owner, NULL);
1588 message = gst_message_new_custom (GST_MESSAGE_STREAM_STATUS, src, structure);
1594 * gst_message_parse_stream_status:
1595 * @message: A valid #GstMessage of type GST_MESSAGE_STREAM_STATUS.
1596 * @type: (out): A pointer to hold the status type
1597 * @owner: (out) (transfer none): The owner element of the message source
1599 * Extracts the stream status type and owner the GstMessage. The returned
1600 * owner remains valid for as long as the reference to @message is valid and
1601 * should thus not be unreffed.
1606 gst_message_parse_stream_status (GstMessage * message,
1607 GstStreamStatusType * type, GstElement ** owner)
1609 const GValue *owner_gvalue;
1610 GstStructure *structure;
1612 g_return_if_fail (GST_IS_MESSAGE (message));
1613 g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_STREAM_STATUS);
1615 structure = GST_MESSAGE_STRUCTURE (message);
1616 owner_gvalue = gst_structure_id_get_value (structure, GST_QUARK (OWNER));
1617 g_return_if_fail (owner_gvalue != NULL);
1620 *type = (GstStreamStatusType)
1621 g_value_get_enum (gst_structure_id_get_value (structure,
1624 *owner = (GstElement *) g_value_get_object (owner_gvalue);
1628 * gst_message_set_stream_status_object:
1629 * @message: A valid #GstMessage of type GST_MESSAGE_STREAM_STATUS.
1630 * @object: the object controlling the streaming
1632 * Configures the object handling the streaming thread. This is usually a
1633 * GstTask object but other objects might be added in the future.
1636 gst_message_set_stream_status_object (GstMessage * message,
1637 const GValue * object)
1639 GstStructure *structure;
1641 g_return_if_fail (GST_IS_MESSAGE (message));
1642 g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_STREAM_STATUS);
1644 structure = GST_MESSAGE_STRUCTURE (message);
1645 gst_structure_id_set_value (structure, GST_QUARK (OBJECT), object);
1649 * gst_message_get_stream_status_object:
1650 * @message: A valid #GstMessage of type GST_MESSAGE_STREAM_STATUS.
1652 * Extracts the object managing the streaming thread from @message.
1654 * Returns: a GValue containing the object that manages the streaming thread.
1655 * This object is usually of type GstTask but other types can be added in the
1656 * future. The object remains valid as long as @message is valid.
1659 gst_message_get_stream_status_object (GstMessage * message)
1661 const GValue *result;
1662 GstStructure *structure;
1664 g_return_val_if_fail (GST_IS_MESSAGE (message), NULL);
1665 g_return_val_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_STREAM_STATUS,
1668 structure = GST_MESSAGE_STRUCTURE (message);
1669 result = gst_structure_id_get_value (structure, GST_QUARK (OBJECT));
1675 * gst_message_new_step_done:
1676 * @src: The object originating the message.
1677 * @format: the format of @amount
1678 * @amount: the amount of stepped data
1679 * @rate: the rate of the stepped amount
1680 * @flush: is this an flushing step
1681 * @intermediate: is this an intermediate step
1682 * @duration: the duration of the data
1683 * @eos: the step caused EOS
1685 * This message is posted by elements when they complete a part, when @intermediate set
1686 * to TRUE, or a complete step operation.
1688 * @duration will contain the amount of time (in GST_FORMAT_TIME) of the stepped
1689 * @amount of media in format @format.
1691 * Returns: (transfer full): the new step_done message.
1696 gst_message_new_step_done (GstObject * src, GstFormat format, guint64 amount,
1697 gdouble rate, gboolean flush, gboolean intermediate, guint64 duration,
1700 GstMessage *message;
1701 GstStructure *structure;
1703 structure = gst_structure_new_id (GST_QUARK (MESSAGE_STEP_DONE),
1704 GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
1705 GST_QUARK (AMOUNT), G_TYPE_UINT64, amount,
1706 GST_QUARK (RATE), G_TYPE_DOUBLE, rate,
1707 GST_QUARK (FLUSH), G_TYPE_BOOLEAN, flush,
1708 GST_QUARK (INTERMEDIATE), G_TYPE_BOOLEAN, intermediate,
1709 GST_QUARK (DURATION), G_TYPE_UINT64, duration,
1710 GST_QUARK (EOS), G_TYPE_BOOLEAN, eos, NULL);
1711 message = gst_message_new_custom (GST_MESSAGE_STEP_DONE, src, structure);
1717 * gst_message_parse_step_done:
1718 * @message: A valid #GstMessage of type GST_MESSAGE_STEP_DONE.
1719 * @format: (out) (allow-none): result location for the format
1720 * @amount: (out) (allow-none): result location for the amount
1721 * @rate: (out) (allow-none): result location for the rate
1722 * @flush: (out) (allow-none): result location for the flush flag
1723 * @intermediate: (out) (allow-none): result location for the intermediate flag
1724 * @duration: (out) (allow-none): result location for the duration
1725 * @eos: (out) (allow-none): result location for the EOS flag
1727 * Extract the values the step_done message.
1732 gst_message_parse_step_done (GstMessage * message, GstFormat * format,
1733 guint64 * amount, gdouble * rate, gboolean * flush, gboolean * intermediate,
1734 guint64 * duration, gboolean * eos)
1736 GstStructure *structure;
1738 g_return_if_fail (GST_IS_MESSAGE (message));
1739 g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_STEP_DONE);
1741 structure = GST_MESSAGE_STRUCTURE (message);
1742 gst_structure_id_get (structure,
1743 GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
1744 GST_QUARK (AMOUNT), G_TYPE_UINT64, amount,
1745 GST_QUARK (RATE), G_TYPE_DOUBLE, rate,
1746 GST_QUARK (FLUSH), G_TYPE_BOOLEAN, flush,
1747 GST_QUARK (INTERMEDIATE), G_TYPE_BOOLEAN, intermediate,
1748 GST_QUARK (DURATION), G_TYPE_UINT64, duration,
1749 GST_QUARK (EOS), G_TYPE_BOOLEAN, eos, NULL);
1753 * gst_message_new_step_start:
1754 * @src: The object originating the message.
1755 * @active: if the step is active or queued
1756 * @format: the format of @amount
1757 * @amount: the amount of stepped data
1758 * @rate: the rate of the stepped amount
1759 * @flush: is this an flushing step
1760 * @intermediate: is this an intermediate step
1762 * This message is posted by elements when they accept or activate a new step
1763 * event for @amount in @format.
1765 * @active is set to FALSE when the element accepted the new step event and has
1766 * queued it for execution in the streaming threads.
1768 * @active is set to TRUE when the element has activated the step operation and
1769 * is now ready to start executing the step in the streaming thread. After this
1770 * message is emited, the application can queue a new step operation in the
1773 * Returns: (transfer full): The new step_start message.
1778 gst_message_new_step_start (GstObject * src, gboolean active, GstFormat format,
1779 guint64 amount, gdouble rate, gboolean flush, gboolean intermediate)
1781 GstMessage *message;
1782 GstStructure *structure;
1784 structure = gst_structure_new_id (GST_QUARK (MESSAGE_STEP_START),
1785 GST_QUARK (ACTIVE), G_TYPE_BOOLEAN, active,
1786 GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
1787 GST_QUARK (AMOUNT), G_TYPE_UINT64, amount,
1788 GST_QUARK (RATE), G_TYPE_DOUBLE, rate,
1789 GST_QUARK (FLUSH), G_TYPE_BOOLEAN, flush,
1790 GST_QUARK (INTERMEDIATE), G_TYPE_BOOLEAN, intermediate, NULL);
1791 message = gst_message_new_custom (GST_MESSAGE_STEP_START, src, structure);
1797 * gst_message_parse_step_start:
1798 * @message: A valid #GstMessage of type GST_MESSAGE_STEP_DONE.
1799 * @active: (out) (allow-none): result location for the active flag
1800 * @format: (out) (allow-none): result location for the format
1801 * @amount: (out) (allow-none): result location for the amount
1802 * @rate: (out) (allow-none): result location for the rate
1803 * @flush: (out) (allow-none): result location for the flush flag
1804 * @intermediate: (out) (allow-none): result location for the intermediate flag
1806 * Extract the values from step_start message.
1811 gst_message_parse_step_start (GstMessage * message, gboolean * active,
1812 GstFormat * format, guint64 * amount, gdouble * rate, gboolean * flush,
1813 gboolean * intermediate)
1815 GstStructure *structure;
1817 g_return_if_fail (GST_IS_MESSAGE (message));
1818 g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_STEP_START);
1820 structure = GST_MESSAGE_STRUCTURE (message);
1821 gst_structure_id_get (structure,
1822 GST_QUARK (ACTIVE), G_TYPE_BOOLEAN, active,
1823 GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
1824 GST_QUARK (AMOUNT), G_TYPE_UINT64, amount,
1825 GST_QUARK (RATE), G_TYPE_DOUBLE, rate,
1826 GST_QUARK (FLUSH), G_TYPE_BOOLEAN, flush,
1827 GST_QUARK (INTERMEDIATE), G_TYPE_BOOLEAN, intermediate, NULL);
1831 * gst_message_new_qos:
1832 * @src: The object originating the message.
1833 * @live: if the message was generated by a live element
1834 * @running_time: the running time of the buffer that generated the message
1835 * @stream_time: the stream time of the buffer that generated the message
1836 * @timestamp: the timestamps of the buffer that generated the message
1837 * @duration: the duration of the buffer that generated the message
1839 * A QOS message is posted on the bus whenever an element decides to drop a
1840 * buffer because of QoS reasons or whenever it changes its processing strategy
1841 * because of QoS reasons (quality adjustments such as processing at lower
1844 * This message can be posted by an element that performs synchronisation against the
1845 * clock (live) or it could be dropped by an element that performs QoS because of QOS
1846 * events received from a downstream element (!live).
1848 * @running_time, @stream_time, @timestamp, @duration should be set to the
1849 * respective running-time, stream-time, timestamp and duration of the (dropped)
1850 * buffer that generated the QoS event. Values can be left to
1851 * GST_CLOCK_TIME_NONE when unknown.
1853 * Returns: (transfer full): The new qos message.
1858 gst_message_new_qos (GstObject * src, gboolean live, guint64 running_time,
1859 guint64 stream_time, guint64 timestamp, guint64 duration)
1861 GstMessage *message;
1862 GstStructure *structure;
1864 structure = gst_structure_new_id (GST_QUARK (MESSAGE_QOS),
1865 GST_QUARK (LIVE), G_TYPE_BOOLEAN, live,
1866 GST_QUARK (RUNNING_TIME), G_TYPE_UINT64, running_time,
1867 GST_QUARK (STREAM_TIME), G_TYPE_UINT64, stream_time,
1868 GST_QUARK (TIMESTAMP), G_TYPE_UINT64, timestamp,
1869 GST_QUARK (DURATION), G_TYPE_UINT64, duration,
1870 GST_QUARK (JITTER), G_TYPE_INT64, (gint64) 0,
1871 GST_QUARK (PROPORTION), G_TYPE_DOUBLE, (gdouble) 1.0,
1872 GST_QUARK (QUALITY), G_TYPE_INT, (gint) 1000000,
1873 GST_QUARK (FORMAT), GST_TYPE_FORMAT, GST_FORMAT_UNDEFINED,
1874 GST_QUARK (PROCESSED), G_TYPE_UINT64, (guint64) - 1,
1875 GST_QUARK (DROPPED), G_TYPE_UINT64, (guint64) - 1, NULL);
1876 message = gst_message_new_custom (GST_MESSAGE_QOS, src, structure);
1882 * gst_message_set_qos_values:
1883 * @message: A valid #GstMessage of type GST_MESSAGE_QOS.
1884 * @jitter: The difference of the running-time against the deadline.
1885 * @proportion: Long term prediction of the ideal rate relative to normal rate
1886 * to get optimal quality.
1887 * @quality: An element dependent integer value that specifies the current
1888 * quality level of the element. The default maximum quality is 1000000.
1890 * Set the QoS values that have been calculated/analysed from the QoS data
1895 gst_message_set_qos_values (GstMessage * message, gint64 jitter,
1896 gdouble proportion, gint quality)
1898 GstStructure *structure;
1900 g_return_if_fail (GST_IS_MESSAGE (message));
1901 g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_QOS);
1903 structure = GST_MESSAGE_STRUCTURE (message);
1904 gst_structure_id_set (structure,
1905 GST_QUARK (JITTER), G_TYPE_INT64, jitter,
1906 GST_QUARK (PROPORTION), G_TYPE_DOUBLE, proportion,
1907 GST_QUARK (QUALITY), G_TYPE_INT, quality, NULL);
1911 * gst_message_set_qos_stats:
1912 * @message: A valid #GstMessage of type GST_MESSAGE_QOS.
1913 * @format: Units of the 'processed' and 'dropped' fields. Video sinks and video
1914 * filters will use GST_FORMAT_BUFFERS (frames). Audio sinks and audio filters
1915 * will likely use GST_FORMAT_DEFAULT (samples).
1916 * @processed: Total number of units correctly processed since the last state
1917 * change to READY or a flushing operation.
1918 * @dropped: Total number of units dropped since the last state change to READY
1919 * or a flushing operation.
1921 * Set the QoS stats representing the history of the current continuous pipeline
1924 * When @format is @GST_FORMAT_UNDEFINED both @dropped and @processed are
1925 * invalid. Values of -1 for either @processed or @dropped mean unknown values.
1930 gst_message_set_qos_stats (GstMessage * message, GstFormat format,
1931 guint64 processed, guint64 dropped)
1933 GstStructure *structure;
1935 g_return_if_fail (GST_IS_MESSAGE (message));
1936 g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_QOS);
1938 structure = GST_MESSAGE_STRUCTURE (message);
1939 gst_structure_id_set (structure,
1940 GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
1941 GST_QUARK (PROCESSED), G_TYPE_UINT64, processed,
1942 GST_QUARK (DROPPED), G_TYPE_UINT64, dropped, NULL);
1946 * gst_message_parse_qos:
1947 * @message: A valid #GstMessage of type GST_MESSAGE_QOS.
1948 * @live: (out) (allow-none): if the message was generated by a live element
1949 * @running_time: (out) (allow-none): the running time of the buffer that
1950 * generated the message
1951 * @stream_time: (out) (allow-none): the stream time of the buffer that
1952 * generated the message
1953 * @timestamp: (out) (allow-none): the timestamps of the buffer that
1954 * generated the message
1955 * @duration: (out) (allow-none): the duration of the buffer that
1956 * generated the message
1958 * Extract the timestamps and live status from the QoS message.
1960 * The returned values give the running_time, stream_time, timestamp and
1961 * duration of the dropped buffer. Values of GST_CLOCK_TIME_NONE mean unknown
1967 gst_message_parse_qos (GstMessage * message, gboolean * live,
1968 guint64 * running_time, guint64 * stream_time, guint64 * timestamp,
1971 GstStructure *structure;
1973 g_return_if_fail (GST_IS_MESSAGE (message));
1974 g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_QOS);
1976 structure = GST_MESSAGE_STRUCTURE (message);
1977 gst_structure_id_get (structure,
1978 GST_QUARK (LIVE), G_TYPE_BOOLEAN, live,
1979 GST_QUARK (RUNNING_TIME), G_TYPE_UINT64, running_time,
1980 GST_QUARK (STREAM_TIME), G_TYPE_UINT64, stream_time,
1981 GST_QUARK (TIMESTAMP), G_TYPE_UINT64, timestamp,
1982 GST_QUARK (DURATION), G_TYPE_UINT64, duration, NULL);
1986 * gst_message_parse_qos_values:
1987 * @message: A valid #GstMessage of type GST_MESSAGE_QOS.
1988 * @jitter: (out) (allow-none): The difference of the running-time against
1990 * @proportion: (out) (allow-none): Long term prediction of the ideal rate
1991 * relative to normal rate to get optimal quality.
1992 * @quality: (out) (allow-none): An element dependent integer value that
1993 * specifies the current quality level of the element. The default
1994 * maximum quality is 1000000.
1996 * Extract the QoS values that have been calculated/analysed from the QoS data
2001 gst_message_parse_qos_values (GstMessage * message, gint64 * jitter,
2002 gdouble * proportion, gint * quality)
2004 GstStructure *structure;
2006 g_return_if_fail (GST_IS_MESSAGE (message));
2007 g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_QOS);
2009 structure = GST_MESSAGE_STRUCTURE (message);
2010 gst_structure_id_get (structure,
2011 GST_QUARK (JITTER), G_TYPE_INT64, jitter,
2012 GST_QUARK (PROPORTION), G_TYPE_DOUBLE, proportion,
2013 GST_QUARK (QUALITY), G_TYPE_INT, quality, NULL);
2017 * gst_message_parse_qos_stats:
2018 * @message: A valid #GstMessage of type GST_MESSAGE_QOS.
2019 * @format: (out) (allow-none): Units of the 'processed' and 'dropped' fields.
2020 * Video sinks and video filters will use GST_FORMAT_BUFFERS (frames).
2021 * Audio sinks and audio filters will likely use GST_FORMAT_DEFAULT
2023 * @processed: (out) (allow-none): Total number of units correctly processed
2024 * since the last state change to READY or a flushing operation.
2025 * @dropped: (out) (allow-none): Total number of units dropped since the last
2026 * state change to READY or a flushing operation.
2028 * Extract the QoS stats representing the history of the current continuous
2029 * pipeline playback period.
2031 * When @format is @GST_FORMAT_UNDEFINED both @dropped and @processed are
2032 * invalid. Values of -1 for either @processed or @dropped mean unknown values.
2037 gst_message_parse_qos_stats (GstMessage * message, GstFormat * format,
2038 guint64 * processed, guint64 * dropped)
2040 GstStructure *structure;
2042 g_return_if_fail (GST_IS_MESSAGE (message));
2043 g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_QOS);
2045 structure = GST_MESSAGE_STRUCTURE (message);
2046 gst_structure_id_get (structure,
2047 GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
2048 GST_QUARK (PROCESSED), G_TYPE_UINT64, processed,
2049 GST_QUARK (DROPPED), G_TYPE_UINT64, dropped, NULL);
2053 * gst_message_new_progress:
2054 * @src: The object originating the message.
2055 * @type: a #GstProgressType
2056 * @code: a progress code
2057 * @text: free, user visible text describing the progress
2059 * Progress messages are posted by elements when they use an asynchronous task
2060 * to perform actions triggered by a state change.
2062 * @code contains a well defined string describing the action.
2063 * @test should contain a user visible string detailing the current action.
2065 * Returns: (transfer full): The new qos message.
2068 gst_message_new_progress (GstObject * src, GstProgressType type,
2069 const gchar * code, const gchar * text)
2071 GstMessage *message;
2072 GstStructure *structure;
2073 gint percent = 100, timeout = -1;
2075 g_return_val_if_fail (code != NULL, NULL);
2076 g_return_val_if_fail (text != NULL, NULL);
2078 if (type == GST_PROGRESS_TYPE_START || type == GST_PROGRESS_TYPE_CONTINUE)
2081 structure = gst_structure_new_id (GST_QUARK (MESSAGE_PROGRESS),
2082 GST_QUARK (TYPE), GST_TYPE_PROGRESS_TYPE, type,
2083 GST_QUARK (CODE), G_TYPE_STRING, code,
2084 GST_QUARK (TEXT), G_TYPE_STRING, text,
2085 GST_QUARK (PERCENT), G_TYPE_INT, percent,
2086 GST_QUARK (TIMEOUT), G_TYPE_INT, timeout, NULL);
2087 message = gst_message_new_custom (GST_MESSAGE_PROGRESS, src, structure);
2093 * gst_message_parse_progress:
2094 * @message: A valid #GstMessage of type GST_MESSAGE_PROGRESS.
2095 * @type: (out) (allow-none): location for the type
2096 * @code: (out) (allow-none) (transfer full): location for the code
2097 * @text: (out) (allow-none) (transfer full): location for the text
2099 * Parses the progress @type, @code and @text.
2102 gst_message_parse_progress (GstMessage * message, GstProgressType * type,
2103 gchar ** code, gchar ** text)
2105 GstStructure *structure;
2107 g_return_if_fail (GST_IS_MESSAGE (message));
2108 g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_PROGRESS);
2110 structure = GST_MESSAGE_STRUCTURE (message);
2111 gst_structure_id_get (structure,
2112 GST_QUARK (TYPE), GST_TYPE_PROGRESS_TYPE, type,
2113 GST_QUARK (CODE), G_TYPE_STRING, code,
2114 GST_QUARK (TEXT), G_TYPE_STRING, text, NULL);
2118 * gst_message_new_toc:
2119 * @src: the object originating the message.
2120 * @toc: (transfer none): #GstToc structure for the message.
2121 * @updated: whether TOC was updated or not.
2123 * Create a new TOC message. The message is posted by elements
2124 * that discovered or updated a TOC.
2126 * Returns: (transfer full): a new TOC message.
2131 gst_message_new_toc (GstObject * src, GstToc * toc, gboolean updated)
2133 GstStructure *toc_struct;
2135 g_return_val_if_fail (toc != NULL, NULL);
2137 toc_struct = gst_structure_new_id (GST_QUARK (MESSAGE_TOC),
2138 GST_QUARK (TOC), GST_TYPE_TOC, toc,
2139 GST_QUARK (UPDATED), G_TYPE_BOOLEAN, updated, NULL);
2141 return gst_message_new_custom (GST_MESSAGE_TOC, src, toc_struct);
2145 * gst_message_parse_toc:
2146 * @message: a valid #GstMessage of type GST_MESSAGE_TOC.
2147 * @toc: (out) (transfer full): return location for the TOC.
2148 * @updated: (out): return location for the updated flag.
2150 * Extract thef TOC from the #GstMessage. The TOC returned in the
2151 * output argument is a copy; the caller must free it with
2152 * gst_toc_unref() when done.
2157 gst_message_parse_toc (GstMessage * message, GstToc ** toc, gboolean * updated)
2159 g_return_if_fail (GST_IS_MESSAGE (message));
2160 g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_TOC);
2161 g_return_if_fail (toc != NULL);
2163 gst_structure_id_get (GST_MESSAGE_STRUCTURE (message),
2164 GST_QUARK (TOC), GST_TYPE_TOC, toc,
2165 GST_QUARK (UPDATED), G_TYPE_BOOLEAN, updated, NULL);
2169 * gst_message_new_reset_time:
2170 * @src: (transfer none): The object originating the message.
2171 * @running_time: the requested running-time
2173 * This message is posted when the pipeline running-time should be reset to
2174 * @running_time, like after a flushing seek.
2176 * Returns: (transfer full): The new reset_time message.
2181 gst_message_new_reset_time (GstObject * src, GstClockTime running_time)
2183 GstMessage *message;
2184 GstStructure *structure;
2186 structure = gst_structure_new_id (GST_QUARK (MESSAGE_RESET_TIME),
2187 GST_QUARK (RUNNING_TIME), G_TYPE_UINT64, running_time, NULL);
2188 message = gst_message_new_custom (GST_MESSAGE_RESET_TIME, src, structure);
2194 * gst_message_parse_reset_time:
2195 * @message: A valid #GstMessage of type GST_MESSAGE_RESET_TIME.
2196 * @running_time: (out): Result location for the running_time or NULL
2198 * Extract the running-time from the RESET_TIME message.
2203 gst_message_parse_reset_time (GstMessage * message, GstClockTime * running_time)
2205 GstStructure *structure;
2207 g_return_if_fail (GST_IS_MESSAGE (message));
2208 g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_RESET_TIME);
2210 structure = GST_MESSAGE_STRUCTURE (message);
2213 g_value_get_uint64 (gst_structure_id_get_value (structure,
2214 GST_QUARK (RUNNING_TIME)));
2218 * gst_message_new_stream_start:
2219 * @src: (transfer none): The object originating the message.
2221 * Create a new stream_start message. This message is generated and posted in
2222 * the sink elements of a GstBin. The bin will only forward the STREAM_START
2223 * message to the application if all sinks have posted an STREAM_START message.
2225 * Returns: (transfer full): The new stream_start message.
2230 gst_message_new_stream_start (GstObject * src)
2232 GstMessage *message;
2234 message = gst_message_new_custom (GST_MESSAGE_STREAM_START, src, NULL);