gstmessage.c 49.2 KB
Newer Older
Wim Taymans's avatar
Wim Taymans committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
/* GStreamer
 * Copyright (C) 2004 Wim Taymans <wim@fluendo.com>
 *
 * gstmessage.c: GstMessage subsystem
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */
Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
21

22 23
/**
 * SECTION:gstmessage
Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
24 25
 * @short_description: Lightweight objects to signal the application of
 *                     pipeline events
26
 * @see_also: #GstBus, #GstMiniObject, #GstElement
27
 *
Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
28
 * Messages are implemented as a subclass of #GstMiniObject with a generic
29 30 31 32
 * #GstStructure as the content. This allows for writing custom messages without
 * requiring an API change while allowing a wide range of different types
 * of messages.
 *
Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
33 34
 * Messages are posted by objects in the pipeline and are passed to the
 * application using the #GstBus.
35 36 37 38 39 40 41 42 43 44 45 46 47 48

 * The basic use pattern of posting a message on a #GstBus is as follows:
 *
 * <example>
 * <title>Posting a #GstMessage</title>
 *   <programlisting>
 *    gst_bus_post (bus, gst_message_new_eos());
 *   </programlisting>
 * </example>
 *
 * A #GstElement usually posts messages on the bus provided by the parent
 * container using gst_element_post_message().
 *
 * Last reviewed on 2005-11-09 (0.9.4)
49
 */
Wim Taymans's avatar
Wim Taymans committed
50 51 52


#include "gst_private.h"
53
#include <string.h>             /* memcpy */
54
#include "gsterror.h"
55
#include "gstenumtypes.h"
Wim Taymans's avatar
Wim Taymans committed
56 57
#include "gstinfo.h"
#include "gstmessage.h"
58
#include "gsttaglist.h"
59
#include "gstutils.h"
60
#include "gstquark.h"
Wim Taymans's avatar
Wim Taymans committed
61 62


63 64
#define GST_MESSAGE_SEQNUM(e) ((GstMessage*)e)->abidata.ABI.seqnum

65 66
static void gst_message_finalize (GstMessage * message);
static GstMessage *_gst_message_copy (GstMessage * message);
Wim Taymans's avatar
Wim Taymans committed
67

68 69
static GstMiniObjectClass *parent_class = NULL;

Wim Taymans's avatar
Wim Taymans committed
70 71 72 73 74
void
_gst_message_initialize (void)
{
  GST_CAT_INFO (GST_CAT_GST_INIT, "init messages");

75 76 77
  /* the GstMiniObject types need to be class_ref'd once before it can be
   * done from multiple threads;
   * see http://bugzilla.gnome.org/show_bug.cgi?id=304551 */
78
  g_type_class_ref (gst_message_get_type ());
Wim Taymans's avatar
Wim Taymans committed
79 80
}

81 82
typedef struct
{
83 84
  const gint type;
  const gchar *name;
85 86 87 88 89 90 91 92 93 94 95 96
  GQuark quark;
} GstMessageQuarks;

static GstMessageQuarks message_quarks[] = {
  {GST_MESSAGE_UNKNOWN, "unknown", 0},
  {GST_MESSAGE_EOS, "eos", 0},
  {GST_MESSAGE_ERROR, "error", 0},
  {GST_MESSAGE_WARNING, "warning", 0},
  {GST_MESSAGE_INFO, "info", 0},
  {GST_MESSAGE_TAG, "tag", 0},
  {GST_MESSAGE_BUFFERING, "buffering", 0},
  {GST_MESSAGE_STATE_CHANGED, "state-changed", 0},
97
  {GST_MESSAGE_STATE_DIRTY, "state-dirty", 0},
98
  {GST_MESSAGE_STEP_DONE, "step-done", 0},
Wim Taymans's avatar
Wim Taymans committed
99 100
  {GST_MESSAGE_CLOCK_PROVIDE, "clock-provide", 0},
  {GST_MESSAGE_CLOCK_LOST, "clock-lost", 0},
101 102 103 104
  {GST_MESSAGE_NEW_CLOCK, "new-clock", 0},
  {GST_MESSAGE_STRUCTURE_CHANGE, "structure-change", 0},
  {GST_MESSAGE_STREAM_STATUS, "stream-status", 0},
  {GST_MESSAGE_APPLICATION, "application", 0},
Wim Taymans's avatar
Wim Taymans committed
105
  {GST_MESSAGE_ELEMENT, "element", 0},
106 107
  {GST_MESSAGE_SEGMENT_START, "segment-start", 0},
  {GST_MESSAGE_SEGMENT_DONE, "segment-done", 0},
108
  {GST_MESSAGE_DURATION, "duration", 0},
109
  {GST_MESSAGE_LATENCY, "latency", 0},
110 111
  {GST_MESSAGE_ASYNC_START, "async-start", 0},
  {GST_MESSAGE_ASYNC_DONE, "async-done", 0},
112
  {GST_MESSAGE_REQUEST_STATE, "request-state", 0},
113 114 115
  {0, NULL, 0}
};

Stefan Kost's avatar
Stefan Kost committed
116 117 118 119 120 121
/**
 * gst_message_type_get_name:
 * @type: the message type
 *
 * Get a printable name for the given message type. Do not modify or free.
 *
Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
122
 * Returns: a reference to the static name of the message.
Stefan Kost's avatar
Stefan Kost committed
123
 */
124 125 126 127 128 129 130 131 132 133 134 135
const gchar *
gst_message_type_get_name (GstMessageType type)
{
  gint i;

  for (i = 0; message_quarks[i].name; i++) {
    if (type == message_quarks[i].type)
      return message_quarks[i].name;
  }
  return "unknown";
}

Stefan Kost's avatar
Stefan Kost committed
136 137 138 139 140 141 142 143
/**
 * gst_message_type_to_quark:
 * @type: the message type
 *
 * Get the unique quark for the given message type.
 *
 * Returns: the quark associated with the message type
 */
144 145 146 147 148 149 150 151 152 153 154 155
GQuark
gst_message_type_to_quark (GstMessageType type)
{
  gint i;

  for (i = 0; message_quarks[i].name; i++) {
    if (type == message_quarks[i].type)
      return message_quarks[i].quark;
  }
  return 0;
}

156 157 158 159 160 161 162 163
#define _do_init \
{ \
  gint i; \
  \
  for (i = 0; message_quarks[i].name; i++) { \
    message_quarks[i].quark = \
        g_quark_from_static_string (message_quarks[i].name); \
  } \
164
}
Wim Taymans's avatar
Wim Taymans committed
165

166 167 168
G_DEFINE_TYPE_WITH_CODE (GstMessage, gst_message, GST_TYPE_MINI_OBJECT,
    _do_init);

169
static void
170
gst_message_class_init (GstMessageClass * klass)
171
{
172
  parent_class = g_type_class_peek_parent (klass);
Wim Taymans's avatar
Wim Taymans committed
173

174 175
  klass->mini_object_class.copy = (GstMiniObjectCopyFunction) _gst_message_copy;
  klass->mini_object_class.finalize =
176 177
      (GstMiniObjectFinalizeFunction) gst_message_finalize;
}
Wim Taymans's avatar
Wim Taymans committed
178

179
static void
180
gst_message_init (GstMessage * message)
181
{
182
  GST_CAT_LOG (GST_CAT_MESSAGE, "new message %p", message);
Wim Taymans's avatar
Wim Taymans committed
183
  GST_MESSAGE_TIMESTAMP (message) = GST_CLOCK_TIME_NONE;
Wim Taymans's avatar
Wim Taymans committed
184 185 186
}

static void
187
gst_message_finalize (GstMessage * message)
Wim Taymans's avatar
Wim Taymans committed
188
{
189
  g_return_if_fail (message != NULL);
Wim Taymans's avatar
Wim Taymans committed
190

191
  GST_CAT_LOG (GST_CAT_MESSAGE, "finalize message %p", message);
192

Wim Taymans's avatar
Wim Taymans committed
193
  if (GST_MESSAGE_SRC (message)) {
194
    gst_object_unref (GST_MESSAGE_SRC (message));
Wim Taymans's avatar
Wim Taymans committed
195
    GST_MESSAGE_SRC (message) = NULL;
Wim Taymans's avatar
Wim Taymans committed
196 197 198 199 200 201 202 203
  }

  if (message->lock) {
    GST_MESSAGE_LOCK (message);
    GST_MESSAGE_SIGNAL (message);
    GST_MESSAGE_UNLOCK (message);
  }

204 205
  if (message->structure) {
    gst_structure_set_parent_refcount (message->structure, NULL);
Wim Taymans's avatar
Wim Taymans committed
206
    gst_structure_free (message->structure);
207
  }
208 209

  GST_MINI_OBJECT_CLASS (parent_class)->finalize (GST_MINI_OBJECT (message));
Wim Taymans's avatar
Wim Taymans committed
210 211
}

212 213
static GstMessage *
_gst_message_copy (GstMessage * message)
Wim Taymans's avatar
Wim Taymans committed
214
{
215 216
  GstMessage *copy;

217
  GST_CAT_LOG (GST_CAT_MESSAGE, "copy message %p", message);
218 219 220

  copy = (GstMessage *) gst_mini_object_new (GST_TYPE_MESSAGE);

Wim Taymans's avatar
Wim Taymans committed
221
  /* FIXME, need to copy relevant data from the miniobject. */
222 223
  //memcpy (copy, message, sizeof (GstMessage));

Wim Taymans's avatar
Wim Taymans committed
224 225 226 227
  GST_MESSAGE_GET_LOCK (copy) = GST_MESSAGE_GET_LOCK (message);
  GST_MESSAGE_COND (copy) = GST_MESSAGE_COND (message);
  GST_MESSAGE_TYPE (copy) = GST_MESSAGE_TYPE (message);
  GST_MESSAGE_TIMESTAMP (copy) = GST_MESSAGE_TIMESTAMP (message);
228
  GST_MESSAGE_SEQNUM (copy) = GST_MESSAGE_SEQNUM (message);
229 230

  if (GST_MESSAGE_SRC (message)) {
231
    GST_MESSAGE_SRC (copy) = gst_object_ref (GST_MESSAGE_SRC (message));
232 233 234 235 236
  }

  if (message->structure) {
    copy->structure = gst_structure_copy (message->structure);
    gst_structure_set_parent_refcount (copy->structure,
237
        &copy->mini_object.refcount);
238 239 240
  }

  return copy;
Wim Taymans's avatar
Wim Taymans committed
241 242
}

Wim Taymans's avatar
Wim Taymans committed
243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260
/**
 * gst_message_new_custom:
 * @type: The #GstMessageType to distinguish messages
 * @src: The object originating the message.
 * @structure: The structure for the message. The message will take ownership of
 * the structure.
 *
 * Create a new custom-typed message. This can be used for anything not
 * handled by other message-specific functions to pass a message to the
 * app. The structure field can be NULL.
 *
 * Returns: The new message.
 *
 * MT safe.
 */
GstMessage *
gst_message_new_custom (GstMessageType type, GstObject * src,
    GstStructure * structure)
Wim Taymans's avatar
Wim Taymans committed
261 262 263
{
  GstMessage *message;

264
  message = (GstMessage *) gst_mini_object_new (GST_TYPE_MESSAGE);
Wim Taymans's avatar
Wim Taymans committed
265

266 267
  GST_CAT_LOG (GST_CAT_MESSAGE, "source %s: creating new message %p %s",
      (src ? GST_OBJECT_NAME (src) : "NULL"), message,
268
      gst_message_type_get_name (type));
Wim Taymans's avatar
Wim Taymans committed
269

270
  message->type = type;
271 272 273 274 275

  if (src)
    gst_object_ref (src);
  message->src = src;

Wim Taymans's avatar
Wim Taymans committed
276 277 278 279 280
  if (structure) {
    gst_structure_set_parent_refcount (structure,
        &message->mini_object.refcount);
  }
  message->structure = structure;
Wim Taymans's avatar
Wim Taymans committed
281

282 283
  GST_MESSAGE_SEQNUM (message) = gst_util_seqnum_next ();

Wim Taymans's avatar
Wim Taymans committed
284 285 286
  return message;
}

287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306
/**
 * gst_message_get_seqnum:
 * @message: A #GstMessage.
 *
 * Retrieve the sequence number of a message.
 *
 * Messages have ever-incrementing sequence numbers, which may also be set
 * explicitly via gst_message_set_seqnum(). Sequence numbers are typically used
 * to indicate that a message corresponds to some other set of messages or
 * events, for example a SEGMENT_DONE message corresponding to a SEEK event. It
 * is considered good practice to make this correspondence when possible, though
 * it is not required.
 *
 * Note that events and messages share the same sequence number incrementor;
 * two events or messages will never not have the same sequence number unless
 * that correspondence was made explicitly.
 *
 * Returns: The message's sequence number.
 *
 * MT safe.
307 308
 *
 * Since: 0.10.22
309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329
 */
guint32
gst_message_get_seqnum (GstMessage * message)
{
  g_return_val_if_fail (GST_IS_MESSAGE (message), -1);

  return GST_MESSAGE_SEQNUM (message);
}

/**
 * gst_message_set_seqnum:
 * @message: A #GstMessage.
 * @seqnum: A sequence number.
 *
 * Set the sequence number of a message.
 *
 * This function might be called by the creator of a message to indicate that
 * the message relates to other messages or events. See gst_message_get_seqnum()
 * for more information.
 *
 * MT safe.
330 331
 *
 * Since: 0.10.22
332 333 334 335 336 337 338 339 340
 */
void
gst_message_set_seqnum (GstMessage * message, guint32 seqnum)
{
  g_return_if_fail (GST_IS_MESSAGE (message));

  GST_MESSAGE_SEQNUM (message) = seqnum;
}

Wim Taymans's avatar
Wim Taymans committed
341 342
/**
 * gst_message_new_eos:
Stefan Kost's avatar
Stefan Kost committed
343
 * @src: The object originating the message.
Wim Taymans's avatar
Wim Taymans committed
344
 *
345 346 347
 * Create a new eos message. This message is generated and posted in
 * the sink elements of a GstBin. The bin will only forward the EOS
 * message to the application if all sinks have posted an EOS message.
Wim Taymans's avatar
Wim Taymans committed
348 349 350 351 352 353 354 355 356 357
 *
 * Returns: The new eos message.
 *
 * MT safe.
 */
GstMessage *
gst_message_new_eos (GstObject * src)
{
  GstMessage *message;

Wim Taymans's avatar
Wim Taymans committed
358
  message = gst_message_new_custom (GST_MESSAGE_EOS, src, NULL);
Wim Taymans's avatar
Wim Taymans committed
359 360 361 362 363 364 365 366

  return message;
}

/**
 * gst_message_new_error:
 * @src: The object originating the message.
 * @error: The GError for this message.
367
 * @debug: A debugging string.
Wim Taymans's avatar
Wim Taymans committed
368
 *
369
 * Create a new error message. The message will copy @error and
370
 * @debug. This message is posted by element when a fatal event
371 372
 * occured. The pipeline will probably (partially) stop. The application
 * receiving this message should stop the pipeline.
Wim Taymans's avatar
Wim Taymans committed
373 374 375 376 377 378
 *
 * Returns: The new error message.
 *
 * MT safe.
 */
GstMessage *
379
gst_message_new_error (GstObject * src, GError * error, const gchar * debug)
Wim Taymans's avatar
Wim Taymans committed
380 381
{
  GstMessage *message;
382
  GstStructure *structure;
Wim Taymans's avatar
Wim Taymans committed
383

384
  structure = gst_structure_id_new (GST_QUARK (MESSAGE_ERROR),
385 386 387
      GST_QUARK (GERROR), GST_TYPE_G_ERROR, error,
      GST_QUARK (DEBUG), G_TYPE_STRING, debug, NULL);
  message = gst_message_new_custom (GST_MESSAGE_ERROR, src, structure);
Wim Taymans's avatar
Wim Taymans committed
388 389 390 391 392 393 394 395

  return message;
}

/**
 * gst_message_new_warning:
 * @src: The object originating the message.
 * @error: The GError for this message.
396
 * @debug: A debugging string.
Wim Taymans's avatar
Wim Taymans committed
397
 *
398
 * Create a new warning message. The message will make copies of @error and
Wim Taymans's avatar
Wim Taymans committed
399 400 401 402 403 404 405
 * @debug.
 *
 * Returns: The new warning message.
 *
 * MT safe.
 */
GstMessage *
406
gst_message_new_warning (GstObject * src, GError * error, const gchar * debug)
Wim Taymans's avatar
Wim Taymans committed
407 408
{
  GstMessage *message;
409
  GstStructure *structure;
Wim Taymans's avatar
Wim Taymans committed
410

411
  structure = gst_structure_id_new (GST_QUARK (MESSAGE_WARNING),
412 413 414
      GST_QUARK (GERROR), GST_TYPE_G_ERROR, error,
      GST_QUARK (DEBUG), G_TYPE_STRING, debug, NULL);
  message = gst_message_new_custom (GST_MESSAGE_WARNING, src, structure);
Wim Taymans's avatar
Wim Taymans committed
415 416 417 418

  return message;
}

419 420 421 422
/**
 * gst_message_new_info:
 * @src: The object originating the message.
 * @error: The GError for this message.
423
 * @debug: A debugging string.
424 425 426 427 428
 *
 * Create a new info message. The message will make copies of @error and
 * @debug.
 *
 * MT safe.
429
 *
Stefan Kost's avatar
Stefan Kost committed
430 431
 * Returns: The new info message.
 *
432
 * Since: 0.10.12
433 434
 */
GstMessage *
435
gst_message_new_info (GstObject * src, GError * error, const gchar * debug)
436 437
{
  GstMessage *message;
438
  GstStructure *structure;
439

440 441 442
  structure = gst_structure_id_new (GST_QUARK (MESSAGE_INFO),
      GST_QUARK (GERROR), GST_TYPE_G_ERROR, error,
      GST_QUARK (DEBUG), G_TYPE_STRING, debug, NULL);
443
  message = gst_message_new_custom (GST_MESSAGE_INFO, src, structure);
444 445 446 447

  return message;
}

Wim Taymans's avatar
Wim Taymans committed
448 449 450 451 452 453
/**
 * gst_message_new_tag:
 * @src: The object originating the message.
 * @tag_list: The tag list for the message.
 *
 * Create a new tag message. The message will take ownership of the tag list.
454
 * The message is posted by elements that discovered a new taglist.
Wim Taymans's avatar
Wim Taymans committed
455 456 457 458 459 460 461 462 463 464
 *
 * Returns: The new tag message.
 *
 * MT safe.
 */
GstMessage *
gst_message_new_tag (GstObject * src, GstTagList * tag_list)
{
  GstMessage *message;

465 466
  g_return_val_if_fail (GST_IS_STRUCTURE (tag_list), NULL);

Wim Taymans's avatar
Wim Taymans committed
467 468
  message =
      gst_message_new_custom (GST_MESSAGE_TAG, src, (GstStructure *) tag_list);
Wim Taymans's avatar
Wim Taymans committed
469 470 471 472

  return message;
}

473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505
/**
 * gst_message_new_tag_full:
 * @src: The object originating the message.
 * @pad: The originating pad for the tag.
 * @tag_list: The tag list for the message.
 *
 * Create a new tag message. The message will take ownership of the tag list.
 * The message is posted by elements that discovered a new taglist.
 *
 * Returns: The new tag message.
 *
 * Since: 0.10.24
 *
 * MT safe.
 */
GstMessage *
gst_message_new_tag_full (GstObject * src, GstPad * pad, GstTagList * tag_list)
{
  GstMessage *message;
  GstStructure *s;

  g_return_val_if_fail (GST_IS_STRUCTURE (tag_list), NULL);
  g_return_val_if_fail (pad == NULL || GST_IS_PAD (pad), NULL);

  s = (GstStructure *) tag_list;
  if (pad)
    gst_structure_set (s, "source-pad", GST_TYPE_PAD, pad, NULL);

  message = gst_message_new_custom (GST_MESSAGE_TAG, src, s);

  return message;
}

506 507 508 509 510 511 512 513 514
/**
 * gst_message_new_buffering:
 * @src: The object originating the message.
 * @percent: The buffering percent
 *
 * Create a new buffering message. This message can be posted by an element that
 * needs to buffer data before it can continue processing. @percent should be a
 * value between 0 and 100. A value of 100 means that the buffering completed.
 *
Wim Taymans's avatar
Wim Taymans committed
515 516 517 518 519 520 521
 * When @percent is < 100 the application should PAUSE a PLAYING pipeline. When
 * @percent is 100, the application can set the pipeline (back) to PLAYING.
 * The application must be prepared to receive BUFFERING messages in the
 * PREROLLING state and may only set the pipeline to PLAYING after receiving a
 * message with @percent set to 100, which can happen after the pipeline
 * completed prerolling. 
 *
522
 * MT safe.
523
 *
Stefan Kost's avatar
Stefan Kost committed
524 525
 * Returns: The new buffering message.
 *
526
 * Since: 0.10.11
527 528 529 530 531
 */
GstMessage *
gst_message_new_buffering (GstObject * src, gint percent)
{
  GstMessage *message;
532
  GstStructure *structure;
533 534 535

  g_return_val_if_fail (percent >= 0 && percent <= 100, NULL);

536
  structure = gst_structure_id_new (GST_QUARK (MESSAGE_BUFFERING),
537 538 539 540
      GST_QUARK (BUFFER_PERCENT), G_TYPE_INT, percent,
      GST_QUARK (BUFFERING_MODE), GST_TYPE_BUFFERING_MODE, GST_BUFFERING_STREAM,
      GST_QUARK (AVG_IN_RATE), G_TYPE_INT, -1,
      GST_QUARK (AVG_OUT_RATE), G_TYPE_INT, -1,
541 542
      GST_QUARK (BUFFERING_LEFT), G_TYPE_INT64, G_GINT64_CONSTANT (-1),
      GST_QUARK (ESTIMATED_TOTAL), G_TYPE_INT64, G_GINT64_CONSTANT (-1), NULL);
543
  message = gst_message_new_custom (GST_MESSAGE_BUFFERING, src, structure);
544 545 546 547

  return message;
}

Wim Taymans's avatar
Wim Taymans committed
548
/**
Stefan Kost's avatar
Stefan Kost committed
549
 * gst_message_new_state_changed:
550 551 552 553
 * @src: the object originating the message
 * @oldstate: the previous state
 * @newstate: the new (current) state
 * @pending: the pending (target) state
Wim Taymans's avatar
Wim Taymans committed
554
 *
555 556
 * Create a state change message. This message is posted whenever an element
 * changed its state.
Wim Taymans's avatar
Wim Taymans committed
557 558 559 560 561 562
 *
 * Returns: The new state change message.
 *
 * MT safe.
 */
GstMessage *
563
gst_message_new_state_changed (GstObject * src,
564
    GstState oldstate, GstState newstate, GstState pending)
Wim Taymans's avatar
Wim Taymans committed
565 566
{
  GstMessage *message;
567
  GstStructure *structure;
Wim Taymans's avatar
Wim Taymans committed
568

569
  structure = gst_structure_id_new (GST_QUARK (MESSAGE_STATE),
570 571 572 573
      GST_QUARK (OLD_STATE), GST_TYPE_STATE, (gint) oldstate,
      GST_QUARK (NEW_STATE), GST_TYPE_STATE, (gint) newstate,
      GST_QUARK (PENDING_STATE), GST_TYPE_STATE, (gint) pending, NULL);
  message = gst_message_new_custom (GST_MESSAGE_STATE_CHANGED, src, structure);
Wim Taymans's avatar
Wim Taymans committed
574 575 576 577

  return message;
}

578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599
/**
 * gst_message_new_state_dirty:
 * @src: the object originating the message
 *
 * Create a state dirty message. This message is posted whenever an element
 * changed its state asynchronously and is used internally to update the
 * states of container objects.
 *
 * Returns: The new state dirty message.
 *
 * MT safe.
 */
GstMessage *
gst_message_new_state_dirty (GstObject * src)
{
  GstMessage *message;

  message = gst_message_new_custom (GST_MESSAGE_STATE_DIRTY, src, NULL);

  return message;
}

Wim Taymans's avatar
Wim Taymans committed
600 601 602
/**
 * gst_message_new_clock_provide:
 * @src: The object originating the message.
603
 * @clock: The clock it provides
Wim Taymans's avatar
Wim Taymans committed
604 605
 * @ready: TRUE if the sender can provide a clock
 *
Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
606
 * Create a clock provide message. This message is posted whenever an
Wim Taymans's avatar
Wim Taymans committed
607 608 609
 * element is ready to provide a clock or lost its ability to provide
 * a clock (maybe because it paused or became EOS).
 *
Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
610
 * This message is mainly used internally to manage the clock
Wim Taymans's avatar
Wim Taymans committed
611 612 613 614 615 616 617
 * selection.
 *
 * Returns: The new provide clock message.
 *
 * MT safe.
 */
GstMessage *
618 619
gst_message_new_clock_provide (GstObject * src, GstClock * clock,
    gboolean ready)
Wim Taymans's avatar
Wim Taymans committed
620 621
{
  GstMessage *message;
622
  GstStructure *structure;
Wim Taymans's avatar
Wim Taymans committed
623

624
  structure = gst_structure_id_new (GST_QUARK (MESSAGE_CLOCK_PROVIDE),
625 626 627
      GST_QUARK (CLOCK), GST_TYPE_CLOCK, clock,
      GST_QUARK (READY), G_TYPE_BOOLEAN, ready, NULL);
  message = gst_message_new_custom (GST_MESSAGE_CLOCK_PROVIDE, src, structure);
628

Wim Taymans's avatar
Wim Taymans committed
629 630 631
  return message;
}

632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651
/**
 * gst_message_new_clock_lost:
 * @src: The object originating the message.
 * @clock: the clock that was lost
 *
 * Create a clock lost message. This message is posted whenever the
 * clock is not valid anymore.
 *
 * If this message is posted by the pipeline, the pipeline will
 * select a new clock again when it goes to PLAYING. It might therefore
 * be needed to set the pipeline to PAUSED and PLAYING again.
 *
 * Returns: The new clock lost message.
 *
 * MT safe.
 */
GstMessage *
gst_message_new_clock_lost (GstObject * src, GstClock * clock)
{
  GstMessage *message;
652
  GstStructure *structure;
653

654
  structure = gst_structure_id_new (GST_QUARK (MESSAGE_CLOCK_LOST),
655 656
      GST_QUARK (CLOCK), GST_TYPE_CLOCK, clock, NULL);
  message = gst_message_new_custom (GST_MESSAGE_CLOCK_LOST, src, structure);
657 658 659 660

  return message;
}

Wim Taymans's avatar
Wim Taymans committed
661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676
/**
 * gst_message_new_new_clock:
 * @src: The object originating the message.
 * @clock: the new selected clock
 *
 * Create a new clock message. This message is posted whenever the
 * pipeline selectes a new clock for the pipeline.
 *
 * Returns: The new new clock message.
 *
 * MT safe.
 */
GstMessage *
gst_message_new_new_clock (GstObject * src, GstClock * clock)
{
  GstMessage *message;
677
  GstStructure *structure;
Wim Taymans's avatar
Wim Taymans committed
678

679
  structure = gst_structure_id_new (GST_QUARK (MESSAGE_NEW_CLOCK),
680 681
      GST_QUARK (CLOCK), GST_TYPE_CLOCK, clock, NULL);
  message = gst_message_new_custom (GST_MESSAGE_NEW_CLOCK, src, structure);
Wim Taymans's avatar
Wim Taymans committed
682 683 684 685

  return message;
}

686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715
/**
 * gst_message_new_structure_change:
 * @src: The object originating the message.
 * @type: The change type.
 * @owner: The owner element of @src.
 * @busy: Whether the structure change is busy.
 *
 * Create a new structure change message. This message is posted when the
 * structure of a pipeline is in the process of being changed, for example
 * when pads are linked or unlinked.
 *
 * @src should be the srcpad that unlinked or linked.
 *
 * Returns: The new structure change message.
 *
 * MT safe.
 *
 * Since: 0.10.22.
 */
GstMessage *
gst_message_new_structure_change (GstObject * src, GstStructureChangeType type,
    GstElement * owner, gboolean busy)
{
  GstMessage *message;
  GstStructure *structure;

  g_return_val_if_fail (GST_IS_PAD (src), NULL);
  g_return_val_if_fail (GST_PAD_DIRECTION (src) == GST_PAD_SRC, NULL);
  g_return_val_if_fail (GST_IS_ELEMENT (owner), NULL);

716
  structure = gst_structure_id_new (GST_QUARK (MESSAGE_STRUCTURE_CHANGE),
717 718 719 720 721 722 723 724 725 726
      GST_QUARK (TYPE), GST_TYPE_STRUCTURE_CHANGE_TYPE, type,
      GST_QUARK (OWNER), GST_TYPE_ELEMENT, owner,
      GST_QUARK (BUSY), G_TYPE_BOOLEAN, busy, NULL);

  message = gst_message_new_custom (GST_MESSAGE_STRUCTURE_CHANGE, src,
      structure);

  return message;
}

Wim Taymans's avatar
Wim Taymans committed
727
/**
728 729
 * gst_message_new_segment_start:
 * @src: The object originating the message.
730 731
 * @format: The format of the position being played
 * @position: The position of the segment being played
732 733 734 735 736 737 738 739 740 741 742
 *
 * Create a new segment message. This message is posted by elements that
 * start playback of a segment as a result of a segment seek. This message
 * is not received by the application but is used for maintenance reasons in
 * container elements.
 *
 * Returns: The new segment start message.
 *
 * MT safe.
 */
GstMessage *
743 744
gst_message_new_segment_start (GstObject * src, GstFormat format,
    gint64 position)
745 746
{
  GstMessage *message;
747
  GstStructure *structure;
748

749
  structure = gst_structure_id_new (GST_QUARK (MESSAGE_SEGMENT_START),
750 751 752
      GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
      GST_QUARK (POSITION), G_TYPE_INT64, position, NULL);
  message = gst_message_new_custom (GST_MESSAGE_SEGMENT_START, src, structure);
753 754 755 756 757 758 759

  return message;
}

/**
 * gst_message_new_segment_done:
 * @src: The object originating the message.
760 761
 * @format: The format of the position being done
 * @position: The position of the segment being done
762 763 764 765 766 767 768 769 770 771 772
 *
 * Create a new segment done message. This message is posted by elements that
 * finish playback of a segment as a result of a segment seek. This message
 * is received by the application after all elements that posted a segment_start
 * have posted the segment_done.
 *
 * Returns: The new segment done message.
 *
 * MT safe.
 */
GstMessage *
773 774
gst_message_new_segment_done (GstObject * src, GstFormat format,
    gint64 position)
775 776
{
  GstMessage *message;
777
  GstStructure *structure;
778

779
  structure = gst_structure_id_new (GST_QUARK (MESSAGE_SEGMENT_DONE),
780 781 782
      GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
      GST_QUARK (POSITION), G_TYPE_INT64, position, NULL);
  message = gst_message_new_custom (GST_MESSAGE_SEGMENT_DONE, src, structure);
783 784 785 786

  return message;
}

787 788 789 790 791 792 793 794 795
/**
 * gst_message_new_application:
 * @src: The object originating the message.
 * @structure: The structure for the message. The message will take ownership of
 * the structure.
 *
 * Create a new application-typed message. GStreamer will never create these
 * messages; they are a gift from us to you. Enjoy.
 *
Stefan Kost's avatar
Stefan Kost committed
796 797
 * Returns: The new application message.
 *
798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816
 * MT safe.
 */
GstMessage *
gst_message_new_application (GstObject * src, GstStructure * structure)
{
  return gst_message_new_custom (GST_MESSAGE_APPLICATION, src, structure);
}

/**
 * gst_message_new_element:
 * @src: The object originating the message.
 * @structure: The structure for the message. The message will take ownership of
 * the structure.
 *
 * Create a new element-specific message. This is meant as a generic way of
 * allowing one-way communication from an element to an application, for example
 * "the firewire cable was unplugged". The format of the message should be
 * documented in the element's documentation. The structure field can be NULL.
 *
Stefan Kost's avatar
Stefan Kost committed
817 818
 * Returns: The new element message.
 *
819 820 821 822 823 824 825 826
 * MT safe.
 */
GstMessage *
gst_message_new_element (GstObject * src, GstStructure * structure)
{
  return gst_message_new_custom (GST_MESSAGE_ELEMENT, src, structure);
}

827 828 829 830 831 832 833 834 835
/**
 * gst_message_new_duration:
 * @src: The object originating the message.
 * @format: The format of the duration
 * @duration: The new duration 
 *
 * Create a new duration message. This message is posted by elements that
 * know the duration of a stream in a specific format. This message
 * is received by bins and is used to calculate the total duration of a
836 837 838 839
 * pipeline. Elements may post a duration message with a duration of
 * GST_CLOCK_TIME_NONE to indicate that the duration has changed and the 
 * cached duration should be discarded. The new duration can then be 
 * retrieved via a query.
840 841 842 843 844 845 846 847 848
 *
 * Returns: The new duration message.
 *
 * MT safe.
 */
GstMessage *
gst_message_new_duration (GstObject * src, GstFormat format, gint64 duration)
{
  GstMessage *message;
849
  GstStructure *structure;
850

851
  structure = gst_structure_id_new (GST_QUARK (MESSAGE_DURATION),
852 853 854
      GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
      GST_QUARK (DURATION), G_TYPE_INT64, duration, NULL);
  message = gst_message_new_custom (GST_MESSAGE_DURATION, src, structure);
855 856 857 858

  return message;
}

859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877
/**
 * gst_message_new_async_start:
 * @src: The object originating the message.
 * @new_base_time: if a new base_time should be set on the element
 *
 * This message is posted by elements when they start an ASYNC state change. 
 * @new_base_time is set to TRUE when the element lost its state when it was
 * PLAYING.
 *
 * Returns: The new async_start message. 
 *
 * MT safe.
 *
 * Since: 0.10.13
 */
GstMessage *
gst_message_new_async_start (GstObject * src, gboolean new_base_time)
{
  GstMessage *message;
878
  GstStructure *structure;
879

880
  structure = gst_structure_id_new (GST_QUARK (MESSAGE_ASYNC_START),
881 882
      GST_QUARK (NEW_BASE_TIME), G_TYPE_BOOLEAN, new_base_time, NULL);
  message = gst_message_new_custom (GST_MESSAGE_ASYNC_START, src, structure);
883 884 885 886 887 888 889 890

  return message;
}

/**
 * gst_message_new_async_done:
 * @src: The object originating the message.
 *
Stefan Kost's avatar
Stefan Kost committed
891 892
 * The message is posted when elements completed an ASYNC state change.
 *
893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908
 * Returns: The new async_done message.
 *
 * MT safe.
 *
 * Since: 0.10.13
 */
GstMessage *
gst_message_new_async_done (GstObject * src)
{
  GstMessage *message;

  message = gst_message_new_custom (GST_MESSAGE_ASYNC_DONE, src, NULL);

  return message;
}

909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931
/**
 * gst_message_new_latency:
 * @src: The object originating the message.
 *
 * This message can be posted by elements when their latency requirements have
 * changed.
 *
 * Returns: The new latency message. 
 *
 * MT safe.
 *
 * Since: 0.10.12
 */
GstMessage *
gst_message_new_latency (GstObject * src)
{
  GstMessage *message;

  message = gst_message_new_custom (GST_MESSAGE_LATENCY, src, NULL);

  return message;
}

932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952
/**
 * gst_message_new_request_state:
 * @src: The object originating the message.
 * @state: The new requested state
 *
 * This message can be posted by elements when they want to have their state
 * changed. A typical use case would be an audio server that wants to pause the
 * pipeline because a higher priority stream is being played.
 *
 * Returns: The new requst state message. 
 *
 * MT safe.
 *
 * Since: 0.10.23
 */
GstMessage *
gst_message_new_request_state (GstObject * src, GstState state)
{
  GstMessage *message;
  GstStructure *structure;

953
  structure = gst_structure_id_new (GST_QUARK (MESSAGE_REQUEST_STATE),
954 955 956 957 958 959
      GST_QUARK (NEW_STATE), GST_TYPE_STATE, (gint) state, NULL);
  message = gst_message_new_custom (GST_MESSAGE_REQUEST_STATE, src, structure);

  return message;
}

Wim Taymans's avatar
Wim Taymans committed
960 961 962 963 964 965
/**
 * gst_message_get_structure:
 * @message: The #GstMessage.
 *
 * Access the structure of the message.
 *
966
 * Returns: The structure of the message. The structure is still
Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
967
 * owned by the message, which means that you should not free it and
968
 * that the pointer becomes invalid when you free the message.
Wim Taymans's avatar
Wim Taymans committed
969 970 971 972 973 974 975
 *
 * MT safe.
 */
const GstStructure *
gst_message_get_structure (GstMessage * message)
{
  g_return_val_if_fail (GST_IS_MESSAGE (message), NULL);
976

Wim Taymans's avatar
Wim Taymans committed
977 978 979 980 981 982
  return message->structure;
}

/**
 * gst_message_parse_tag:
 * @message: A valid #GstMessage of type GST_MESSAGE_TAG.
Stefan Kost's avatar
Stefan Kost committed
983
 * @tag_list: Return location for the tag-list.
Wim Taymans's avatar
Wim Taymans committed
984 985 986 987 988 989 990 991 992
 *
 * Extracts the tag list from the GstMessage. The tag list returned in the
 * output argument is a copy; the caller must free it when done.
 *
 * MT safe.
 */
void
gst_message_parse_tag (GstMessage * message, GstTagList ** tag_list)
{
993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023
  GstStructure *ret;

  g_return_if_fail (GST_IS_MESSAGE (message));
  g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_TAG);
  g_return_if_fail (tag_list != NULL);

  ret = gst_structure_copy (message->structure);
  gst_structure_remove_field (ret, "source-pad");

  *tag_list = (GstTagList *) ret;
}

/**
 * gst_message_parse_tag_full:
 * @message: A valid #GstMessage of type GST_MESSAGE_TAG.
 * @pad: Location where the originating pad is stored, unref after usage
 * @tag_list: Return location for the tag-list.
 *
 * Extracts the tag list from the GstMessage. The tag list returned in the
 * output argument is a copy; the caller must free it when done.
 *
 * Since: 0.10.24
 *
 * MT safe.
 */
void
gst_message_parse_tag_full (GstMessage * message, GstPad ** pad,
    GstTagList ** tag_list)
{
  GstStructure *ret;

Wim Taymans's avatar
Wim Taymans committed
1024 1025
  g_return_if_fail (GST_IS_MESSAGE (message));
  g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_TAG);
1026
  g_return_if_fail (tag_list != NULL);
Wim Taymans's avatar
Wim Taymans committed
1027

1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043
  ret = gst_structure_copy (message->structure);

  if (gst_structure_has_field (ret, "source-pad") && pad) {
    const GValue *v;

    v = gst_structure_get_value (ret, "source-pad");
    if (v && G_VALUE_HOLDS (v, GST_TYPE_PAD))
      *pad = g_value_dup_object (v);
    else
      *pad = NULL;
  } else if (pad) {
    *pad = NULL;
  }
  gst_structure_remove_field (ret, "source-pad");

  *tag_list = (GstTagList *) ret;
Wim Taymans's avatar
Wim Taymans committed
1044
}
1045 1046 1047 1048 1049 1050

/**
 * gst_message_parse_buffering:
 * @message: A valid #GstMessage of type GST_MESSAGE_BUFFERING.
 * @percent: Return location for the percent.
 *
Wim Taymans's avatar
Wim Taymans committed
1051 1052
 * Extracts the buffering percent from the GstMessage. see also
 * gst_message_new_buffering().
1053 1054
 *
 * MT safe.
1055 1056
 *
 * Since: 0.10.11
1057 1058 1059 1060 1061 1062 1063 1064
 */
void
gst_message_parse_buffering (GstMessage * message, gint * percent)
{
  g_return_if_fail (GST_IS_MESSAGE (message));
  g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_BUFFERING);

  if (percent)
1065 1066
    *percent = g_value_get_int (gst_structure_id_get_value (message->structure,
            GST_QUARK (BUFFER_PERCENT)));
1067
}
Wim Taymans's avatar
Wim Taymans committed
1068

1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127
/**
 * gst_message_set_buffering_stats:
 * @message: A valid #GstMessage of type GST_MESSAGE_BUFFERING.
 * @mode: a buffering mode 
 * @avg_in: the average input rate
 * @avg_out: the average output rate
 * @buffering_left: amount of buffering time left in milliseconds
 *
 * Configures the buffering stats values in @message.
 *
 * Since: 0.10.20
 */
void
gst_message_set_buffering_stats (GstMessage * message, GstBufferingMode mode,
    gint avg_in, gint avg_out, gint64 buffering_left)
{
  g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_BUFFERING);

  gst_structure_id_set (message->structure,
      GST_QUARK (BUFFERING_MODE), GST_TYPE_BUFFERING_MODE, mode,
      GST_QUARK (AVG_IN_RATE), G_TYPE_INT, avg_in,
      GST_QUARK (AVG_OUT_RATE), G_TYPE_INT, avg_out,
      GST_QUARK (BUFFERING_LEFT), G_TYPE_INT64, buffering_left, NULL);
}

/**
 * gst_message_parse_buffering_stats:
 * @message: A valid #GstMessage of type GST_MESSAGE_BUFFERING.
 * @mode: a buffering mode 
 * @avg_in: the average input rate
 * @avg_out: the average output rate
 * @buffering_left: amount of buffering time left in milliseconds.
 *
 * Extracts the buffering stats values from @message.
 *
 * Since: 0.10.20
 */
void
gst_message_parse_buffering_stats (GstMessage * message,
    GstBufferingMode * mode, gint * avg_in, gint * avg_out,
    gint64 * buffering_left)
{
  g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_BUFFERING);

  if (mode)
    *mode = g_value_get_enum (gst_structure_id_get_value (message->structure,
            GST_QUARK (BUFFERING_MODE)));
  if (avg_in)
    *avg_in = g_value_get_int (gst_structure_id_get_value (message->structure,
            GST_QUARK (AVG_IN_RATE)));
  if (avg_out)
    *avg_out = g_value_get_int (gst_structure_id_get_value (message->structure,
            GST_QUARK (AVG_OUT_RATE)));
  if (buffering_left)
    *buffering_left =
        g_value_get_int64 (gst_structure_id_get_value (message->structure,
            GST_QUARK (BUFFERING_LEFT)));
}

Wim Taymans's avatar
Wim Taymans committed
1128
/**
1129
 * gst_message_parse_state_changed:
1130
 * @message: a valid #GstMessage of type GST_MESSAGE_STATE_CHANGED
1131 1132 1133
 * @oldstate: the previous state, or NULL
 * @newstate: the new (current) state, or NULL
 * @pending: the pending (target) state, or NULL
Wim Taymans's avatar
Wim Taymans committed
1134 1135 1136 1137 1138 1139
 *
 * Extracts the old and new states from the GstMessage.
 *
 * MT safe.
 */
void
1140
gst_message_parse_state_changed (GstMessage * message,
1141
    GstState * oldstate, GstState * newstate, GstState * pending)
Wim Taymans's avatar
Wim Taymans committed
1142 1143 1144 1145
{
  g_return_if_fail (GST_IS_MESSAGE (message));
  g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_STATE_CHANGED);

1146
  if (oldstate)
1147 1148 1149
    *oldstate =
        g_value_get_enum (gst_structure_id_get_value (message->structure,
            GST_QUARK (OLD_STATE)));
1150
  if (newstate)
1151 1152 1153
    *newstate =
        g_value_get_enum (gst_structure_id_get_value (message->structure,
            GST_QUARK (NEW_STATE)));
1154
  if (pending)
1155 1156
    *pending = g_value_get_enum (gst_structure_id_get_value (message->structure,
            GST_QUARK (PENDING_STATE)));
Wim Taymans's avatar
Wim Taymans committed
1157 1158
}

Wim Taymans's avatar
Wim Taymans committed
1159 1160 1161
/**
 * gst_message_parse_clock_provide:
 * @message: A valid #GstMessage of type GST_MESSAGE_CLOCK_PROVIDE.
1162 1163
 * @clock: A pointer to  hold a clock object.
 * @ready: A pointer to hold the ready flag.
Wim Taymans's avatar
Wim Taymans committed
1164
 *
1165 1166
 * Extracts the clock and ready flag from the GstMessage.
 * The clock object returned remains valid until the message is freed.
Wim Taymans's avatar
Wim Taymans committed
1167 1168 1169 1170
 *
 * MT safe.
 */
void
1171 1172
gst_message_parse_clock_provide (GstMessage * message, GstClock ** clock,
    gboolean * ready)
Wim Taymans's avatar
Wim Taymans committed
1173
{
1174 1175
  const GValue *clock_gvalue;

Wim Taymans's avatar
Wim Taymans committed
1176 1177 1178
  g_return_if_fail (GST_IS_MESSAGE (message));
  g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_CLOCK_PROVIDE);

1179 1180
  clock_gvalue =
      gst_structure_id_get_value (message->structure, GST_QUARK (CLOCK));
1181 1182 1183
  g_return_if_fail (clock_gvalue != NULL);
  g_return_if_fail (G_VALUE_TYPE (clock_gvalue) == GST_TYPE_CLOCK);

Wim Taymans's avatar
Wim Taymans committed
1184
  if (ready)
1185 1186 1187
    *ready =
        g_value_get_boolean (gst_structure_id_get_value (message->structure,
            GST_QUARK (READY)));
1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207
  if (clock)
    *clock = (GstClock *) g_value_get_object (clock_gvalue);
}

/**
 * gst_message_parse_clock_lost:
 * @message: A valid #GstMessage of type GST_MESSAGE_CLOCK_LOST.
 * @clock: A pointer to hold the lost clock
 *
 * Extracts the lost clock from the GstMessage.
 * The clock object returned remains valid until the message is freed.
 *
 * MT safe.
 */
void
gst_message_parse_clock_lost (GstMessage * message, GstClock ** clock)
{
  const GValue *clock_gvalue;

  g_return_if_fail (GST_IS_MESSAGE (message));
1208
  g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_CLOCK_LOST);
1209

1210 1211
  clock_gvalue =
      gst_structure_id_get_value (message->structure, GST_QUARK (CLOCK));
1212 1213 1214 1215 1216
  g_return_if_fail (clock_gvalue != NULL);
  g_return_if_fail (G_VALUE_TYPE (clock_gvalue) == GST_TYPE_CLOCK);

  if (clock)
    *clock = (GstClock *) g_value_get_object (clock_gvalue);
Wim Taymans's avatar
Wim Taymans committed
1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236
}

/**
 * gst_message_parse_new_clock:
 * @message: A valid #GstMessage of type GST_MESSAGE_NEW_CLOCK.
 * @clock: A pointer to hold the selected new clock
 *
 * Extracts the new clock from the GstMessage.
 * The clock object returned remains valid until the message is freed.
 *
 * MT safe.
 */
void
gst_message_parse_new_clock (GstMessage * message, GstClock ** clock)
{
  const GValue *clock_gvalue;

  g_return_if_fail (GST_IS_MESSAGE (message));
  g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_NEW_CLOCK);

1237 1238
  clock_gvalue =
      gst_structure_id_get_value (message->structure, GST_QUARK (CLOCK));
Wim Taymans's avatar
Wim Taymans committed
1239 1240 1241 1242 1243 1244 1245
  g_return_if_fail (clock_gvalue != NULL);
  g_return_if_fail (G_VALUE_TYPE (clock_gvalue) == GST_TYPE_CLOCK);

  if (clock)
    *clock = (GstClock *) g_value_get_object (clock_gvalue);
}

1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284
/**
 * gst_message_parse_structure_change:
 * @message: A valid #GstMessage of type GST_MESSAGE_STRUCTURE_CHANGE.
 * @type: A pointer to hold the change type
 * @owner: The owner element of the message source
 * @busy: A pointer to hold whether the change is in progress or has been
 * completed
 *
 * Extracts the change type and completion status from the GstMessage.
 *
 * MT safe.
 *
 * Since: 0.10.22
 */
void
gst_message_parse_structure_change (GstMessage * message,
    GstStructureChangeType * type, GstElement ** owner, gboolean * busy)