2 * Copyright (C) 2004 Wim Taymans <wim@fluendo.com>
4 * gstmessage.h: Header for 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., 51 Franklin St, Fifth Floor,
19 * Boston, MA 02110-1301, USA.
22 #ifndef __GST_MESSAGE_H__
23 #define __GST_MESSAGE_H__
27 typedef struct _GstMessage GstMessage;
31 * @GST_MESSAGE_UNKNOWN: an undefined message
32 * @GST_MESSAGE_EOS: end-of-stream reached in a pipeline. The application will
33 * only receive this message in the PLAYING state and every time it sets a
34 * pipeline to PLAYING that is in the EOS state. The application can perform a
35 * flushing seek in the pipeline, which will undo the EOS state again.
36 * @GST_MESSAGE_ERROR: an error occured. When the application receives an error
37 * message it should stop playback of the pipeline and not assume that more
38 * data will be played.
39 * @GST_MESSAGE_WARNING: a warning occured.
40 * @GST_MESSAGE_INFO: an info message occured
41 * @GST_MESSAGE_TAG: a tag was found.
42 * @GST_MESSAGE_BUFFERING: the pipeline is buffering. When the application
43 * receives a buffering message in the PLAYING state for a non-live pipeline it
44 * must PAUSE the pipeline until the buffering completes, when the percentage
45 * field in the message is 100%. For live pipelines, no action must be
46 * performed and the buffering percentage can be used to inform the user about
48 * @GST_MESSAGE_STATE_CHANGED: a state change happened
49 * @GST_MESSAGE_STATE_DIRTY: an element changed state in a streaming thread.
50 * This message is deprecated.
51 * @GST_MESSAGE_STEP_DONE: a stepping operation finished.
52 * @GST_MESSAGE_CLOCK_PROVIDE: an element notifies its capability of providing
53 * a clock. This message is used internally and
54 * never forwarded to the application.
55 * @GST_MESSAGE_CLOCK_LOST: The current clock as selected by the pipeline became
56 * unusable. The pipeline will select a new clock on
57 * the next PLAYING state change. The application
58 * should set the pipeline to PAUSED and back to
59 * PLAYING when this message is received.
60 * @GST_MESSAGE_NEW_CLOCK: a new clock was selected in the pipeline.
61 * @GST_MESSAGE_STRUCTURE_CHANGE: the structure of the pipeline changed. This
62 * message is used internally and never forwarded to the application.
63 * @GST_MESSAGE_STREAM_STATUS: status about a stream, emitted when it starts,
64 * stops, errors, etc..
65 * @GST_MESSAGE_APPLICATION: message posted by the application, possibly
66 * via an application-specific element.
67 * @GST_MESSAGE_ELEMENT: element-specific message, see the specific element's
69 * @GST_MESSAGE_SEGMENT_START: pipeline started playback of a segment. This
70 * message is used internally and never forwarded to the application.
71 * @GST_MESSAGE_SEGMENT_DONE: pipeline completed playback of a segment. This
72 * message is forwarded to the application after all elements that posted
73 * @GST_MESSAGE_SEGMENT_START posted a GST_MESSAGE_SEGMENT_DONE message.
74 * @GST_MESSAGE_DURATION_CHANGED: The duration of a pipeline changed. The
75 * application can get the new duration with a duration query.
76 * @GST_MESSAGE_ASYNC_START: Posted by elements when they start an ASYNC
77 * #GstStateChange. This message is not forwarded to the application but is used
79 * @GST_MESSAGE_ASYNC_DONE: Posted by elements when they complete an ASYNC
80 * #GstStateChange. The application will only receive this message from the toplevel
82 * @GST_MESSAGE_LATENCY: Posted by elements when their latency changes. The
83 * application should recalculate and distribute a new latency.
84 * @GST_MESSAGE_REQUEST_STATE: Posted by elements when they want the pipeline to
85 * change state. This message is a suggestion to the application which can
86 * decide to perform the state change on (part of) the pipeline.
87 * @GST_MESSAGE_STEP_START: A stepping operation was started.
88 * @GST_MESSAGE_QOS: A buffer was dropped or an element changed its processing
89 * strategy for Quality of Service reasons.
90 * @GST_MESSAGE_PROGRESS: A progress message.
91 * @GST_MESSAGE_TOC: A new table of contents (TOC) was found or previously found TOC
93 * @GST_MESSAGE_RESET_TIME: Message to request resetting the pipeline's
94 * running time from the pipeline. This is an internal message which
95 * applications will likely never receive.
96 * @GST_MESSAGE_STREAM_START: Message indicating start of a new stream. Useful
97 * e.g. when using playbin in gapless playback mode, to get notified when
98 * the next title actually starts playing (which will be some time after
99 * the URI for the next title has been set).
100 * @GST_MESSAGE_ANY: mask for all of the above messages.
102 * The different message types that are available.
104 /* NOTE: keep in sync with quark registration in gstmessage.c
105 * NOTE: keep GST_MESSAGE_ANY a valid gint to avoid compiler warnings.
109 GST_MESSAGE_UNKNOWN = 0,
110 GST_MESSAGE_EOS = (1 << 0),
111 GST_MESSAGE_ERROR = (1 << 1),
112 GST_MESSAGE_WARNING = (1 << 2),
113 GST_MESSAGE_INFO = (1 << 3),
114 GST_MESSAGE_TAG = (1 << 4),
115 GST_MESSAGE_BUFFERING = (1 << 5),
116 GST_MESSAGE_STATE_CHANGED = (1 << 6),
117 GST_MESSAGE_STATE_DIRTY = (1 << 7),
118 GST_MESSAGE_STEP_DONE = (1 << 8),
119 GST_MESSAGE_CLOCK_PROVIDE = (1 << 9),
120 GST_MESSAGE_CLOCK_LOST = (1 << 10),
121 GST_MESSAGE_NEW_CLOCK = (1 << 11),
122 GST_MESSAGE_STRUCTURE_CHANGE = (1 << 12),
123 GST_MESSAGE_STREAM_STATUS = (1 << 13),
124 GST_MESSAGE_APPLICATION = (1 << 14),
125 GST_MESSAGE_ELEMENT = (1 << 15),
126 GST_MESSAGE_SEGMENT_START = (1 << 16),
127 GST_MESSAGE_SEGMENT_DONE = (1 << 17),
128 GST_MESSAGE_DURATION_CHANGED = (1 << 18),
129 GST_MESSAGE_LATENCY = (1 << 19),
130 GST_MESSAGE_ASYNC_START = (1 << 20),
131 GST_MESSAGE_ASYNC_DONE = (1 << 21),
132 GST_MESSAGE_REQUEST_STATE = (1 << 22),
133 GST_MESSAGE_STEP_START = (1 << 23),
134 GST_MESSAGE_QOS = (1 << 24),
135 GST_MESSAGE_PROGRESS = (1 << 25),
136 GST_MESSAGE_TOC = (1 << 26),
137 GST_MESSAGE_RESET_TIME = (1 << 27),
138 GST_MESSAGE_STREAM_START = (1 << 28),
142 #include <gst/gstminiobject.h>
143 #include <gst/gstobject.h>
144 #include <gst/gstelement.h>
145 #include <gst/gsttaglist.h>
146 #include <gst/gststructure.h>
147 #include <gst/gstquery.h>
148 #include <gst/gsttoc.h>
150 #define GST_TYPE_MESSAGE (gst_message_get_type())
151 #define GST_IS_MESSAGE(obj) (GST_IS_MINI_OBJECT_TYPE (obj, GST_TYPE_MESSAGE))
152 #define GST_MESSAGE_CAST(obj) ((GstMessage*)(obj))
153 #define GST_MESSAGE(obj) (GST_MESSAGE_CAST(obj))
155 /* the lock is used to handle the synchronous handling of messages,
156 * the emiting thread is block until the handling thread processed
157 * the message using this mutex/cond pair */
158 #define GST_MESSAGE_GET_LOCK(message) (&GST_MESSAGE_CAST(message)->lock)
159 #define GST_MESSAGE_LOCK(message) g_mutex_lock(GST_MESSAGE_GET_LOCK(message))
160 #define GST_MESSAGE_UNLOCK(message) g_mutex_unlock(GST_MESSAGE_GET_LOCK(message))
161 #define GST_MESSAGE_GET_COND(message) (&GST_MESSAGE_CAST(message)->cond)
162 #define GST_MESSAGE_WAIT(message) g_cond_wait(GST_MESSAGE_GET_COND(message),GST_MESSAGE_GET_LOCK(message))
163 #define GST_MESSAGE_SIGNAL(message) g_cond_signal(GST_MESSAGE_GET_COND(message))
167 * @message: a #GstMessage
169 * Get the #GstMessageType of @message.
171 #define GST_MESSAGE_TYPE(message) (GST_MESSAGE_CAST(message)->type)
173 * GST_MESSAGE_TYPE_NAME:
174 * @message: a #GstMessage
176 * Get a constant string representation of the #GstMessageType of @message.
178 #define GST_MESSAGE_TYPE_NAME(message) gst_message_type_get_name(GST_MESSAGE_TYPE(message))
180 * GST_MESSAGE_TIMESTAMP:
181 * @message: a #GstMessage
183 * Get the timestamp of @message. This is the timestamp when the message
186 #define GST_MESSAGE_TIMESTAMP(message) (GST_MESSAGE_CAST(message)->timestamp)
189 * @message: a #GstMessage
191 * Get the object that posted @message.
193 #define GST_MESSAGE_SRC(message) (GST_MESSAGE_CAST(message)->src)
196 * GST_MESSAGE_SEQNUM:
197 * @message: a #GstMessage
199 * Get the sequence number of @message.
201 #define GST_MESSAGE_SEQNUM(message) (GST_MESSAGE_CAST(message)->seqnum)
204 * GST_MESSAGE_SRC_NAME:
205 * @message: a #GstMessage
207 * Get the name of the object that posted @message. Returns "(NULL)" if
208 * the message has no source object set.
210 #define GST_MESSAGE_SRC_NAME(message) (GST_MESSAGE_SRC(message) ? \
211 GST_OBJECT_NAME (GST_MESSAGE_SRC(message)) : "(NULL)")
214 * GstStructureChangeType:
215 * @GST_STRUCTURE_CHANGE_TYPE_PAD_LINK: Pad linking is starting or done.
216 * @GST_STRUCTURE_CHANGE_TYPE_PAD_UNLINK: Pad unlinking is starting or done.
218 * The type of a %GST_MESSAGE_STRUCTURE_CHANGE.
221 GST_STRUCTURE_CHANGE_TYPE_PAD_LINK = 0,
222 GST_STRUCTURE_CHANGE_TYPE_PAD_UNLINK = 1
223 } GstStructureChangeType;
226 * GstStreamStatusType:
227 * @GST_STREAM_STATUS_TYPE_CREATE: A new thread need to be created.
228 * @GST_STREAM_STATUS_TYPE_ENTER: a thread entered its loop function
229 * @GST_STREAM_STATUS_TYPE_LEAVE: a thread left its loop function
230 * @GST_STREAM_STATUS_TYPE_DESTROY: a thread is destroyed
231 * @GST_STREAM_STATUS_TYPE_START: a thread is started
232 * @GST_STREAM_STATUS_TYPE_PAUSE: a thread is paused
233 * @GST_STREAM_STATUS_TYPE_STOP: a thread is stopped
235 * The type of a %GST_MESSAGE_STREAM_STATUS. The stream status messages inform the
236 * application of new streaming threads and their status.
239 GST_STREAM_STATUS_TYPE_CREATE = 0,
240 GST_STREAM_STATUS_TYPE_ENTER = 1,
241 GST_STREAM_STATUS_TYPE_LEAVE = 2,
242 GST_STREAM_STATUS_TYPE_DESTROY = 3,
244 GST_STREAM_STATUS_TYPE_START = 8,
245 GST_STREAM_STATUS_TYPE_PAUSE = 9,
246 GST_STREAM_STATUS_TYPE_STOP = 10
247 } GstStreamStatusType;
251 * @GST_PROGRESS_TYPE_START: A new task started.
252 * @GST_PROGRESS_TYPE_CONTINUE: A task completed and a new one continues.
253 * @GST_PROGRESS_TYPE_COMPLETE: A task completed.
254 * @GST_PROGRESS_TYPE_CANCELED: A task was canceled.
255 * @GST_PROGRESS_TYPE_ERROR: A task caused an error. An error message is also
258 * The type of a %GST_MESSAGE_PROGRESS. The progress messages inform the
259 * application of the status of assynchronous tasks.
262 GST_PROGRESS_TYPE_START = 0,
263 GST_PROGRESS_TYPE_CONTINUE = 1,
264 GST_PROGRESS_TYPE_COMPLETE = 2,
265 GST_PROGRESS_TYPE_CANCELED = 3,
266 GST_PROGRESS_TYPE_ERROR = 4
271 * @mini_object: the parent structure
272 * @type: the #GstMessageType of the message
273 * @timestamp: the timestamp of the message
274 * @src: the src of the message
275 * @seqnum: the sequence number of the message
281 GstMiniObject mini_object;
283 /*< public > *//* with COW */
289 /*< private >*//* with MESSAGE_LOCK */
290 GMutex lock; /* lock and cond for async delivery */
294 GType gst_message_get_type (void);
296 const gchar* gst_message_type_get_name (GstMessageType type);
297 GQuark gst_message_type_to_quark (GstMessageType type);
302 * @msg: the message to ref
304 * Convenience macro to increase the reference count of the message.
306 * Returns: @msg (for convenience when doing assignments)
308 #ifdef _FOOL_GTK_DOC_
309 G_INLINE_FUNC GstMessage * gst_message_ref (GstMessage * msg);
312 static inline GstMessage *
313 gst_message_ref (GstMessage * msg)
315 return (GstMessage *) gst_mini_object_ref (GST_MINI_OBJECT_CAST (msg));
320 * @msg: the message to unref
322 * Convenience macro to decrease the reference count of the message, possibly
325 #ifdef _FOOL_GTK_DOC_
326 G_INLINE_FUNC void gst_message_unref (GstMessage * msg);
330 gst_message_unref (GstMessage * msg)
332 gst_mini_object_unref (GST_MINI_OBJECT_CAST (msg));
338 * @msg: the message to copy
340 * Creates a copy of the message. Returns a copy of the message.
342 * Returns: (transfer full): a new copy of @msg.
346 #ifdef _FOOL_GTK_DOC_
347 G_INLINE_FUNC GstMessage * gst_message_copy (const GstMessage * msg);
350 static inline GstMessage *
351 gst_message_copy (const GstMessage * msg)
353 return GST_MESSAGE_CAST (gst_mini_object_copy (GST_MINI_OBJECT_CONST_CAST (msg)));
357 * gst_message_is_writable:
358 * @msg: a #GstMessage
360 * Tests if you can safely write into a message's structure or validly
361 * modify the seqnum and timestamp fields.
363 #define gst_message_is_writable(msg) gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (msg))
365 * gst_message_make_writable:
366 * @msg: (transfer full): the message to make writable
368 * Checks if a message is writable. If not, a writable copy is made and
371 * Returns: (transfer full): a message (possibly a duplicate) that is writable.
375 #define gst_message_make_writable(msg) GST_MESSAGE_CAST (gst_mini_object_make_writable (GST_MINI_OBJECT_CAST (msg)))
377 * gst_message_replace:
378 * @old_message: (inout) (transfer full): pointer to a pointer to a #GstMessage
380 * @new_message: (allow-none) (transfer none): pointer to a #GstMessage that will
381 * replace the message pointed to by @old_message.
383 * Modifies a pointer to a #GstMessage to point to a different #GstMessage. The
384 * modification is done atomically (so this is useful for ensuring thread safety
385 * in some cases), and the reference counts are updated appropriately (the old
386 * message is unreffed, the new one is reffed).
388 * Either @new_message or the #GstMessage pointed to by @old_message may be NULL.
390 * Returns: TRUE if @new_message was different from @old_message
392 #ifdef _FOOL_GTK_DOC_
393 G_INLINE_FUNC gboolean gst_message_replace (GstMessage **old_message, GstMessage *new_message);
396 static inline gboolean
397 gst_message_replace (GstMessage **old_message, GstMessage *new_message)
399 return gst_mini_object_replace ((GstMiniObject **) old_message, (GstMiniObject *) new_message);
403 /* custom messages */
404 GstMessage * gst_message_new_custom (GstMessageType type,
406 GstStructure * structure) G_GNUC_MALLOC;
408 gst_message_get_structure (GstMessage *message);
410 gboolean gst_message_has_name (GstMessage *message, const gchar *name);
412 /* identifiers for events and messages */
413 guint32 gst_message_get_seqnum (GstMessage *message);
414 void gst_message_set_seqnum (GstMessage *message, guint32 seqnum);
417 GstMessage * gst_message_new_eos (GstObject * src) G_GNUC_MALLOC;
421 GstMessage * gst_message_new_error (GstObject * src, GError * error, const gchar * debug) G_GNUC_MALLOC;
422 void gst_message_parse_error (GstMessage *message, GError **gerror, gchar **debug);
425 GstMessage * gst_message_new_warning (GstObject * src, GError * error, const gchar * debug) G_GNUC_MALLOC;
426 void gst_message_parse_warning (GstMessage *message, GError **gerror, gchar **debug);
429 GstMessage * gst_message_new_info (GstObject * src, GError * error, const gchar * debug) G_GNUC_MALLOC;
430 void gst_message_parse_info (GstMessage *message, GError **gerror, gchar **debug);
433 GstMessage * gst_message_new_tag (GstObject * src, GstTagList * tag_list) G_GNUC_MALLOC;
434 void gst_message_parse_tag (GstMessage *message, GstTagList **tag_list);
437 GstMessage * gst_message_new_buffering (GstObject * src, gint percent) G_GNUC_MALLOC;
438 void gst_message_parse_buffering (GstMessage *message, gint *percent);
439 void gst_message_set_buffering_stats (GstMessage *message, GstBufferingMode mode,
440 gint avg_in, gint avg_out,
441 gint64 buffering_left);
442 void gst_message_parse_buffering_stats (GstMessage *message, GstBufferingMode *mode,
443 gint *avg_in, gint *avg_out,
444 gint64 *buffering_left);
447 GstMessage * gst_message_new_state_changed (GstObject * src, GstState oldstate,
448 GstState newstate, GstState pending) G_GNUC_MALLOC;
449 void gst_message_parse_state_changed (GstMessage *message, GstState *oldstate,
450 GstState *newstate, GstState *pending);
453 GstMessage * gst_message_new_state_dirty (GstObject * src) G_GNUC_MALLOC;
456 GstMessage * gst_message_new_step_done (GstObject * src, GstFormat format, guint64 amount,
457 gdouble rate, gboolean flush, gboolean intermediate,
458 guint64 duration, gboolean eos) G_GNUC_MALLOC;
459 void gst_message_parse_step_done (GstMessage * message, GstFormat *format, guint64 *amount,
460 gdouble *rate, gboolean *flush, gboolean *intermediate,
461 guint64 *duration, gboolean *eos);
463 GstMessage * gst_message_new_clock_provide (GstObject * src, GstClock *clock, gboolean ready) G_GNUC_MALLOC;
464 void gst_message_parse_clock_provide (GstMessage *message, GstClock **clock,
468 GstMessage * gst_message_new_clock_lost (GstObject * src, GstClock *clock) G_GNUC_MALLOC;
469 void gst_message_parse_clock_lost (GstMessage *message, GstClock **clock);
472 GstMessage * gst_message_new_new_clock (GstObject * src, GstClock *clock) G_GNUC_MALLOC;
473 void gst_message_parse_new_clock (GstMessage *message, GstClock **clock);
476 GstMessage * gst_message_new_application (GstObject * src, GstStructure * structure) G_GNUC_MALLOC;
479 GstMessage * gst_message_new_element (GstObject * src, GstStructure * structure) G_GNUC_MALLOC;
482 GstMessage * gst_message_new_segment_start (GstObject * src, GstFormat format, gint64 position) G_GNUC_MALLOC;
483 void gst_message_parse_segment_start (GstMessage *message, GstFormat *format,
487 GstMessage * gst_message_new_segment_done (GstObject * src, GstFormat format, gint64 position) G_GNUC_MALLOC;
488 void gst_message_parse_segment_done (GstMessage *message, GstFormat *format,
491 /* DURATION_CHANGED */
492 GstMessage * gst_message_new_duration_changed (GstObject * src) G_GNUC_MALLOC;
495 GstMessage * gst_message_new_latency (GstObject * src) G_GNUC_MALLOC;
498 GstMessage * gst_message_new_async_start (GstObject * src) G_GNUC_MALLOC;
501 GstMessage * gst_message_new_async_done (GstObject * src, GstClockTime running_time) G_GNUC_MALLOC;
502 void gst_message_parse_async_done (GstMessage *message, GstClockTime *running_time);
504 /* STRUCTURE CHANGE */
505 GstMessage * gst_message_new_structure_change (GstObject * src, GstStructureChangeType type,
506 GstElement *owner, gboolean busy) G_GNUC_MALLOC;
507 void gst_message_parse_structure_change (GstMessage *message, GstStructureChangeType *type,
508 GstElement **owner, gboolean *busy);
511 GstMessage * gst_message_new_stream_status (GstObject * src, GstStreamStatusType type,
512 GstElement *owner) G_GNUC_MALLOC;
513 void gst_message_parse_stream_status (GstMessage *message, GstStreamStatusType *type,
515 void gst_message_set_stream_status_object (GstMessage *message, const GValue *object);
516 const GValue * gst_message_get_stream_status_object (GstMessage *message);
519 GstMessage * gst_message_new_request_state (GstObject * src, GstState state) G_GNUC_MALLOC;
520 void gst_message_parse_request_state (GstMessage * message, GstState *state);
523 GstMessage * gst_message_new_step_start (GstObject * src, gboolean active, GstFormat format,
524 guint64 amount, gdouble rate, gboolean flush,
525 gboolean intermediate) G_GNUC_MALLOC;
526 void gst_message_parse_step_start (GstMessage * message, gboolean *active, GstFormat *format,
527 guint64 *amount, gdouble *rate, gboolean *flush,
528 gboolean *intermediate);
531 GstMessage * gst_message_new_qos (GstObject * src, gboolean live, guint64 running_time,
532 guint64 stream_time, guint64 timestamp, guint64 duration) G_GNUC_MALLOC;
533 void gst_message_set_qos_values (GstMessage * message, gint64 jitter, gdouble proportion,
535 void gst_message_set_qos_stats (GstMessage * message, GstFormat format, guint64 processed,
537 void gst_message_parse_qos (GstMessage * message, gboolean * live, guint64 * running_time,
538 guint64 * stream_time, guint64 * timestamp, guint64 * duration);
539 void gst_message_parse_qos_values (GstMessage * message, gint64 * jitter, gdouble * proportion,
541 void gst_message_parse_qos_stats (GstMessage * message, GstFormat * format, guint64 * processed,
544 GstMessage * gst_message_new_progress (GstObject * src, GstProgressType type, const gchar *code,
545 const gchar *text) G_GNUC_MALLOC;
546 void gst_message_parse_progress (GstMessage * message, GstProgressType * type, gchar ** code,
550 GstMessage * gst_message_new_toc (GstObject *src, GstToc *toc, gboolean updated);
551 void gst_message_parse_toc (GstMessage *message, GstToc **toc, gboolean *updated);
554 GstMessage * gst_message_new_reset_time (GstObject * src, GstClockTime running_time) G_GNUC_MALLOC;
555 void gst_message_parse_reset_time (GstMessage *message, GstClockTime *running_time);
558 GstMessage * gst_message_new_stream_start (GstObject * src) G_GNUC_MALLOC;
562 #endif /* __GST_MESSAGE_H__ */