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., 59 Temple Place - Suite 330,
19 * Boston, MA 02111-1307, 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: The duration of a pipeline changed. The application
75 * 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
78 * internally. Since: 0.10.13.
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
81 * pipeline. Since: 0.10.13
82 * @GST_MESSAGE_LATENCY: Posted by elements when their latency changes. The
83 * application should recalculate and distribute a new latency. Since: 0.10.12
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. Since: 0.10.23.
87 * @GST_MESSAGE_STEP_START: A stepping operation was started. Since: 0.10.24
88 * @GST_MESSAGE_QOS: A buffer was dropped or an element changed its processing
89 * strategy for Quality of Service reasons. Since: 0.10.29
90 * @GST_MESSAGE_PROGRESS: A progress message. Since: 0.10.33
91 * @GST_MESSAGE_ANY: mask for all of the above messages.
93 * The different message types that are available.
95 /* NOTE: keep in sync with quark registration in gstmessage.c
96 * NOTE: keep GST_MESSAGE_ANY a valid gint to avoid compiler warnings.
100 GST_MESSAGE_UNKNOWN = 0,
101 GST_MESSAGE_EOS = (1 << 0),
102 GST_MESSAGE_ERROR = (1 << 1),
103 GST_MESSAGE_WARNING = (1 << 2),
104 GST_MESSAGE_INFO = (1 << 3),
105 GST_MESSAGE_TAG = (1 << 4),
106 GST_MESSAGE_BUFFERING = (1 << 5),
107 GST_MESSAGE_STATE_CHANGED = (1 << 6),
108 GST_MESSAGE_STATE_DIRTY = (1 << 7),
109 GST_MESSAGE_STEP_DONE = (1 << 8),
110 GST_MESSAGE_CLOCK_PROVIDE = (1 << 9),
111 GST_MESSAGE_CLOCK_LOST = (1 << 10),
112 GST_MESSAGE_NEW_CLOCK = (1 << 11),
113 GST_MESSAGE_STRUCTURE_CHANGE = (1 << 12),
114 GST_MESSAGE_STREAM_STATUS = (1 << 13),
115 GST_MESSAGE_APPLICATION = (1 << 14),
116 GST_MESSAGE_ELEMENT = (1 << 15),
117 GST_MESSAGE_SEGMENT_START = (1 << 16),
118 GST_MESSAGE_SEGMENT_DONE = (1 << 17),
119 GST_MESSAGE_DURATION = (1 << 18),
120 GST_MESSAGE_LATENCY = (1 << 19),
121 GST_MESSAGE_ASYNC_START = (1 << 20),
122 GST_MESSAGE_ASYNC_DONE = (1 << 21),
123 GST_MESSAGE_REQUEST_STATE = (1 << 22),
124 GST_MESSAGE_STEP_START = (1 << 23),
125 GST_MESSAGE_QOS = (1 << 24),
126 GST_MESSAGE_PROGRESS = (1 << 25),
130 #include <gst/gstminiobject.h>
131 #include <gst/gstobject.h>
132 #include <gst/gstelement.h>
133 #include <gst/gsttaglist.h>
134 #include <gst/gststructure.h>
135 #include <gst/gstquery.h>
138 * GST_MESSAGE_TRACE_NAME:
140 * The name used for memory allocation tracing
142 #define GST_MESSAGE_TRACE_NAME "GstMessage"
144 #define GST_TYPE_MESSAGE (gst_message_get_type())
145 #define GST_IS_MESSAGE(obj) (GST_IS_MINI_OBJECT_TYPE (obj, GST_TYPE_MESSAGE))
146 #define GST_MESSAGE_CAST(obj) ((GstMessage*)(obj))
147 #define GST_MESSAGE(obj) (GST_MESSAGE_CAST(obj))
149 /* the lock is used to handle the synchronous handling of messages,
150 * the emiting thread is block until the handling thread processed
151 * the message using this mutex/cond pair */
152 #define GST_MESSAGE_GET_LOCK(message) (GST_MESSAGE_CAST(message)->lock)
153 #define GST_MESSAGE_LOCK(message) g_mutex_lock(GST_MESSAGE_GET_LOCK(message))
154 #define GST_MESSAGE_UNLOCK(message) g_mutex_unlock(GST_MESSAGE_GET_LOCK(message))
155 #define GST_MESSAGE_COND(message) (GST_MESSAGE_CAST(message)->cond)
156 #define GST_MESSAGE_WAIT(message) g_cond_wait(GST_MESSAGE_COND(message),GST_MESSAGE_GET_LOCK(message))
157 #define GST_MESSAGE_SIGNAL(message) g_cond_signal(GST_MESSAGE_COND(message))
161 * @message: a #GstMessage
163 * Get the #GstMessageType of @message.
165 #define GST_MESSAGE_TYPE(message) (GST_MESSAGE_CAST(message)->type)
167 * GST_MESSAGE_TYPE_NAME:
168 * @message: a #GstMessage
170 * Get a constant string representation of the #GstMessageType of @message.
174 #define GST_MESSAGE_TYPE_NAME(message) gst_message_type_get_name(GST_MESSAGE_TYPE(message))
176 * GST_MESSAGE_TIMESTAMP:
177 * @message: a #GstMessage
179 * Get the timestamp of @message. This is the timestamp when the message
182 #define GST_MESSAGE_TIMESTAMP(message) (GST_MESSAGE_CAST(message)->timestamp)
185 * @message: a #GstMessage
187 * Get the object that posted @message.
189 #define GST_MESSAGE_SRC(message) (GST_MESSAGE_CAST(message)->src)
192 * GST_MESSAGE_SEQNUM:
193 * @message: a #GstMessage
195 * Get the sequence number of @message.
197 #define GST_MESSAGE_SEQNUM(message) (GST_MESSAGE_CAST(message)->seqnum)
200 * GST_MESSAGE_SRC_NAME:
201 * @message: a #GstMessage
203 * Get the name of the object that posted @message. Returns "(NULL)" if
204 * the message has no source object set.
208 #define GST_MESSAGE_SRC_NAME(message) (GST_MESSAGE_SRC(message) ? \
209 GST_OBJECT_NAME (GST_MESSAGE_SRC(message)) : "(NULL)")
212 * GstStructureChangeType:
213 * @GST_STRUCTURE_CHANGE_TYPE_PAD_LINK: Pad linking is starting or done.
214 * @GST_STRUCTURE_CHANGE_TYPE_PAD_UNLINK: Pad unlinking is starting or done.
216 * 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.
241 GST_STREAM_STATUS_TYPE_CREATE = 0,
242 GST_STREAM_STATUS_TYPE_ENTER = 1,
243 GST_STREAM_STATUS_TYPE_LEAVE = 2,
244 GST_STREAM_STATUS_TYPE_DESTROY = 3,
246 GST_STREAM_STATUS_TYPE_START = 8,
247 GST_STREAM_STATUS_TYPE_PAUSE = 9,
248 GST_STREAM_STATUS_TYPE_STOP = 10
249 } GstStreamStatusType;
253 * @GST_PROGRESS_TYPE_START: A new task started.
254 * @GST_PROGRESS_TYPE_CONTINUE: A task completed and a new one continues.
255 * @GST_PROGRESS_TYPE_COMPLETE: A task completed.
256 * @GST_PROGRESS_TYPE_CANCELED: A task was canceled.
257 * @GST_PROGRESS_TYPE_ERROR: A task caused an error. An error message is also
260 * The type of a %GST_MESSAGE_PROGRESS. The progress messages inform the
261 * application of the status of assynchronous tasks.
266 GST_PROGRESS_TYPE_START = 0,
267 GST_PROGRESS_TYPE_CONTINUE = 1,
268 GST_PROGRESS_TYPE_COMPLETE = 2,
269 GST_PROGRESS_TYPE_CANCELED = 3,
270 GST_PROGRESS_TYPE_ERROR = 4,
275 * @mini_object: the parent structure
276 * @type: the #GstMessageType of the message
277 * @timestamp: the timestamp of the message
278 * @src: the src of the message
279 * @seqnum: the sequence number of the message
285 GstMiniObject mini_object;
287 /*< public > *//* with COW */
293 /*< private >*//* with MESSAGE_LOCK */
294 GMutex *lock; /* lock and cond for async delivery */
298 GType gst_message_get_type (void);
300 const gchar* gst_message_type_get_name (GstMessageType type);
301 GQuark gst_message_type_to_quark (GstMessageType type);
306 * @msg: the message to ref
308 * Convenience macro to increase the reference count of the message.
310 * Returns: @msg (for convenience when doing assignments)
312 #ifdef _FOOL_GTK_DOC_
313 G_INLINE_FUNC GstMessage * gst_message_ref (GstMessage * msg);
316 static inline GstMessage *
317 gst_message_ref (GstMessage * msg)
319 return (GstMessage *) gst_mini_object_ref (GST_MINI_OBJECT_CAST (msg));
324 * @msg: the message to unref
326 * Convenience macro to decrease the reference count of the message, possibly
329 #ifdef _FOOL_GTK_DOC_
330 G_INLINE_FUNC void gst_message_unref (GstMessage * msg);
334 gst_message_unref (GstMessage * msg)
336 gst_mini_object_unref (GST_MINI_OBJECT_CAST (msg));
342 * @msg: the message to copy
344 * Creates a copy of the message. Returns a copy of the message.
346 * Returns: (transfer full): a new copy of @msg.
350 #ifdef _FOOL_GTK_DOC_
351 G_INLINE_FUNC GstMessage * gst_message_copy (const GstMessage * msg);
354 static inline GstMessage *
355 gst_message_copy (const GstMessage * msg)
357 return GST_MESSAGE_CAST (gst_mini_object_copy (GST_MINI_OBJECT_CONST_CAST (msg)));
361 * gst_message_is_writable:
362 * @msg: a #GstMessage
364 * Tests if you can safely write into a message's structure or validly
365 * modify the seqnum and timestamp fields.
367 #define gst_message_is_writable(msg) gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (msg))
369 * gst_message_make_writable:
370 * @msg: (transfer full): the message to make writable
372 * Checks if a message is writable. If not, a writable copy is made and
375 * Returns: (transfer full): a message (possibly a duplicate) that is writable.
379 #define gst_message_make_writable(msg) GST_MESSAGE_CAST (gst_mini_object_make_writable (GST_MINI_OBJECT_CAST (msg)))
381 * gst_message_replace:
382 * @old_message: (inout) (transfer full): pointer to a pointer to a #GstMessage
384 * @new_message: (allow-none) (transfer none): pointer to a #GstMessage that will
385 * replace the message pointed to by @old_message.
387 * Modifies a pointer to a #GstMessage to point to a different #GstMessage. The
388 * modification is done atomically (so this is useful for ensuring thread safety
389 * in some cases), and the reference counts are updated appropriately (the old
390 * message is unreffed, the new one is reffed).
392 * Either @new_message or the #GstMessage pointed to by @old_message may be NULL.
394 * Returns: TRUE if @new_message was different from @old_message
396 #ifdef _FOOL_GTK_DOC_
397 G_INLINE_FUNC gboolean gst_message_replace (GstMessage **old_message, GstMessage *new_message);
400 static inline gboolean
401 gst_message_replace (GstMessage **old_message, GstMessage *new_message)
403 return gst_mini_object_replace ((GstMiniObject **) old_message, (GstMiniObject *) new_message);
407 /* custom messages */
408 GstMessage * gst_message_new_custom (GstMessageType type,
410 GstStructure * structure) G_GNUC_MALLOC;
412 gst_message_get_structure (GstMessage *message);
414 gboolean gst_message_has_name (GstMessage *message, const gchar *name);
416 /* identifiers for events and messages */
417 guint32 gst_message_get_seqnum (GstMessage *message);
418 void gst_message_set_seqnum (GstMessage *message, guint32 seqnum);
421 GstMessage * gst_message_new_eos (GstObject * src) G_GNUC_MALLOC;
425 GstMessage * gst_message_new_error (GstObject * src, GError * error, const gchar * debug) G_GNUC_MALLOC;
426 void gst_message_parse_error (GstMessage *message, GError **gerror, gchar **debug);
429 GstMessage * gst_message_new_warning (GstObject * src, GError * error, const gchar * debug) G_GNUC_MALLOC;
430 void gst_message_parse_warning (GstMessage *message, GError **gerror, gchar **debug);
433 GstMessage * gst_message_new_info (GstObject * src, GError * error, const gchar * debug) G_GNUC_MALLOC;
434 void gst_message_parse_info (GstMessage *message, GError **gerror, gchar **debug);
437 GstMessage * gst_message_new_tag (GstObject * src, GstTagList * tag_list) G_GNUC_MALLOC;
438 void gst_message_parse_tag (GstMessage *message, GstTagList **tag_list);
441 GstMessage * gst_message_new_buffering (GstObject * src, gint percent) G_GNUC_MALLOC;
442 void gst_message_parse_buffering (GstMessage *message, gint *percent);
443 void gst_message_set_buffering_stats (GstMessage *message, GstBufferingMode mode,
444 gint avg_in, gint avg_out,
445 gint64 buffering_left);
446 void gst_message_parse_buffering_stats (GstMessage *message, GstBufferingMode *mode,
447 gint *avg_in, gint *avg_out,
448 gint64 *buffering_left);
451 GstMessage * gst_message_new_state_changed (GstObject * src, GstState oldstate,
452 GstState newstate, GstState pending) G_GNUC_MALLOC;
453 void gst_message_parse_state_changed (GstMessage *message, GstState *oldstate,
454 GstState *newstate, GstState *pending);
457 GstMessage * gst_message_new_state_dirty (GstObject * src) G_GNUC_MALLOC;
460 GstMessage * gst_message_new_step_done (GstObject * src, GstFormat format, guint64 amount,
461 gdouble rate, gboolean flush, gboolean intermediate,
462 guint64 duration, gboolean eos) G_GNUC_MALLOC;
463 void gst_message_parse_step_done (GstMessage * message, GstFormat *format, guint64 *amount,
464 gdouble *rate, gboolean *flush, gboolean *intermediate,
465 guint64 *duration, gboolean *eos);
467 GstMessage * gst_message_new_clock_provide (GstObject * src, GstClock *clock, gboolean ready) G_GNUC_MALLOC;
468 void gst_message_parse_clock_provide (GstMessage *message, GstClock **clock,
472 GstMessage * gst_message_new_clock_lost (GstObject * src, GstClock *clock) G_GNUC_MALLOC;
473 void gst_message_parse_clock_lost (GstMessage *message, GstClock **clock);
476 GstMessage * gst_message_new_new_clock (GstObject * src, GstClock *clock) G_GNUC_MALLOC;
477 void gst_message_parse_new_clock (GstMessage *message, GstClock **clock);
480 GstMessage * gst_message_new_application (GstObject * src, GstStructure * structure) G_GNUC_MALLOC;
483 GstMessage * gst_message_new_element (GstObject * src, GstStructure * structure) G_GNUC_MALLOC;
486 GstMessage * gst_message_new_segment_start (GstObject * src, GstFormat format, gint64 position) G_GNUC_MALLOC;
487 void gst_message_parse_segment_start (GstMessage *message, GstFormat *format,
491 GstMessage * gst_message_new_segment_done (GstObject * src, GstFormat format, gint64 position) G_GNUC_MALLOC;
492 void gst_message_parse_segment_done (GstMessage *message, GstFormat *format,
496 GstMessage * gst_message_new_duration (GstObject * src, GstFormat format, gint64 duration) G_GNUC_MALLOC;
497 void gst_message_parse_duration (GstMessage *message, GstFormat *format,
501 GstMessage * gst_message_new_latency (GstObject * src) G_GNUC_MALLOC;
504 GstMessage * gst_message_new_async_start (GstObject * src) G_GNUC_MALLOC;
507 GstMessage * gst_message_new_async_done (GstObject * src, gboolean reset_time) G_GNUC_MALLOC;
508 void gst_message_parse_async_done (GstMessage *message, gboolean *reset_time);
510 /* STRUCTURE CHANGE */
511 GstMessage * gst_message_new_structure_change (GstObject * src, GstStructureChangeType type,
512 GstElement *owner, gboolean busy) G_GNUC_MALLOC;
513 void gst_message_parse_structure_change (GstMessage *message, GstStructureChangeType *type,
514 GstElement **owner, gboolean *busy);
517 GstMessage * gst_message_new_stream_status (GstObject * src, GstStreamStatusType type,
518 GstElement *owner) G_GNUC_MALLOC;
519 void gst_message_parse_stream_status (GstMessage *message, GstStreamStatusType *type,
521 void gst_message_set_stream_status_object (GstMessage *message, const GValue *object);
522 const GValue * gst_message_get_stream_status_object (GstMessage *message);
525 GstMessage * gst_message_new_request_state (GstObject * src, GstState state) G_GNUC_MALLOC;
526 void gst_message_parse_request_state (GstMessage * message, GstState *state);
529 GstMessage * gst_message_new_step_start (GstObject * src, gboolean active, GstFormat format,
530 guint64 amount, gdouble rate, gboolean flush,
531 gboolean intermediate) G_GNUC_MALLOC;
532 void gst_message_parse_step_start (GstMessage * message, gboolean *active, GstFormat *format,
533 guint64 *amount, gdouble *rate, gboolean *flush,
534 gboolean *intermediate);
537 GstMessage * gst_message_new_qos (GstObject * src, gboolean live, guint64 running_time,
538 guint64 stream_time, guint64 timestamp, guint64 duration) G_GNUC_MALLOC;
539 void gst_message_set_qos_values (GstMessage * message, gint64 jitter, gdouble proportion,
541 void gst_message_set_qos_stats (GstMessage * message, GstFormat format, guint64 processed,
543 void gst_message_parse_qos (GstMessage * message, gboolean * live, guint64 * running_time,
544 guint64 * stream_time, guint64 * timestamp, guint64 * duration);
545 void gst_message_parse_qos_values (GstMessage * message, gint64 * jitter, gdouble * proportion,
547 void gst_message_parse_qos_stats (GstMessage * message, GstFormat * format, guint64 * processed,
550 GstMessage * gst_message_new_progress (GstObject * src, GstProgressType type, const gchar *code,
551 const gchar *text) G_GNUC_MALLOC;
552 void gst_message_parse_progress (GstMessage * message, GstProgressType * type, gchar ** code,
558 #endif /* __GST_MESSAGE_H__ */