gstmessage.c 19 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.
 */
21 22 23 24 25 26 27 28 29 30 31 32 33
/**
 * SECTION:gstmessage
 * @short_description: Lightweight objects to signal the application of pipeline events
 * @see_also: #GstBus,#GstMiniObject
 *
 * Messages are implemented as a subclass of #GstMiniObject with a generic 
 * #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.
 *
 * Messages are posted by objects in the pipeline and are passed to the 
 * application using the #GstBus. 
 */
Wim Taymans's avatar
Wim Taymans committed
34 35 36 37

#include <string.h>             /* memcpy */

#include "gst_private.h"
38
#include "gsterror.h"
39
#include "gstenumtypes.h"
Wim Taymans's avatar
Wim Taymans committed
40 41
#include "gstinfo.h"
#include "gstmessage.h"
42
#include "gsttaglist.h"
43
#include "gstutils.h"
Wim Taymans's avatar
Wim Taymans committed
44 45


46 47 48 49
static void gst_message_init (GTypeInstance * instance, gpointer g_class);
static void gst_message_class_init (gpointer g_class, gpointer class_data);
static void gst_message_finalize (GstMessage * message);
static GstMessage *_gst_message_copy (GstMessage * message);
Wim Taymans's avatar
Wim Taymans committed
50 51 52 53

void
_gst_message_initialize (void)
{
54 55
  gpointer ptr;

Wim Taymans's avatar
Wim Taymans committed
56 57
  GST_CAT_INFO (GST_CAT_GST_INIT, "init messages");

58
  gst_message_get_type ();
Wim Taymans's avatar
Wim Taymans committed
59

60 61 62 63 64
  /* 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 */
  ptr = g_type_class_ref (GST_TYPE_MESSAGE);
  g_type_class_unref (ptr);
Wim Taymans's avatar
Wim Taymans committed
65 66
}

67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116
typedef struct
{
  gint type;
  gchar *name;
  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},
  {GST_MESSAGE_STEP_DONE, "step-done", 0},
  {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},
  {GST_MESSAGE_SEGMENT_START, "segment-start", 0},
  {GST_MESSAGE_SEGMENT_DONE, "segment-done", 0},
  {0, NULL, 0}
};

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";
}

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;
}

117 118
GType
gst_message_get_type (void)
Wim Taymans's avatar
Wim Taymans committed
119
{
120 121 122
  static GType _gst_message_type;

  if (G_UNLIKELY (_gst_message_type == 0)) {
123
    gint i;
124 125 126 127 128 129 130 131 132 133 134 135
    static const GTypeInfo message_info = {
      sizeof (GstMessageClass),
      NULL,
      NULL,
      gst_message_class_init,
      NULL,
      NULL,
      sizeof (GstMessage),
      0,
      gst_message_init,
      NULL
    };
Wim Taymans's avatar
Wim Taymans committed
136

137 138
    _gst_message_type = g_type_register_static (GST_TYPE_MINI_OBJECT,
        "GstMessage", &message_info, 0);
139 140 141 142 143

    for (i = 0; message_quarks[i].name; i++) {
      message_quarks[i].quark =
          g_quark_from_static_string (message_quarks[i].name);
    }
144 145 146
  }
  return _gst_message_type;
}
Wim Taymans's avatar
Wim Taymans committed
147

148 149 150 151
static void
gst_message_class_init (gpointer g_class, gpointer class_data)
{
  GstMessageClass *message_class = GST_MESSAGE_CLASS (g_class);
Wim Taymans's avatar
Wim Taymans committed
152

153 154 155 156 157
  message_class->mini_object_class.copy =
      (GstMiniObjectCopyFunction) _gst_message_copy;
  message_class->mini_object_class.finalize =
      (GstMiniObjectFinalizeFunction) gst_message_finalize;
}
Wim Taymans's avatar
Wim Taymans committed
158

159 160 161 162 163
static void
gst_message_init (GTypeInstance * instance, gpointer g_class)
{
  GstMessage *message = GST_MESSAGE (instance);

164
  GST_CAT_INFO (GST_CAT_MESSAGE, "new message %p", message);
Wim Taymans's avatar
Wim Taymans committed
165
  GST_MESSAGE_TIMESTAMP (message) = GST_CLOCK_TIME_NONE;
Wim Taymans's avatar
Wim Taymans committed
166 167 168
}

static void
169
gst_message_finalize (GstMessage * message)
Wim Taymans's avatar
Wim Taymans committed
170
{
171
  g_return_if_fail (message != NULL);
Wim Taymans's avatar
Wim Taymans committed
172

173 174
  GST_CAT_INFO (GST_CAT_MESSAGE, "finalize message %p", message);

Wim Taymans's avatar
Wim Taymans committed
175
  if (GST_MESSAGE_SRC (message)) {
176
    gst_object_unref (GST_MESSAGE_SRC (message));
Wim Taymans's avatar
Wim Taymans committed
177
    GST_MESSAGE_SRC (message) = NULL;
Wim Taymans's avatar
Wim Taymans committed
178 179 180 181 182 183 184 185
  }

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

186 187
  if (message->structure) {
    gst_structure_set_parent_refcount (message->structure, NULL);
Wim Taymans's avatar
Wim Taymans committed
188
    gst_structure_free (message->structure);
189
  }
Wim Taymans's avatar
Wim Taymans committed
190 191
}

192 193
static GstMessage *
_gst_message_copy (GstMessage * message)
Wim Taymans's avatar
Wim Taymans committed
194
{
195 196 197 198 199 200
  GstMessage *copy;

  GST_CAT_INFO (GST_CAT_MESSAGE, "copy message %p", message);

  copy = (GstMessage *) gst_mini_object_new (GST_TYPE_MESSAGE);

Wim Taymans's avatar
Wim Taymans committed
201
  /* FIXME, need to copy relevant data from the miniobject. */
202 203
  //memcpy (copy, message, sizeof (GstMessage));

Wim Taymans's avatar
Wim Taymans committed
204 205 206 207
  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);
208 209

  if (GST_MESSAGE_SRC (message)) {
210
    GST_MESSAGE_SRC (copy) = gst_object_ref (GST_MESSAGE_SRC (message));
211 212 213 214 215 216 217 218 219
  }

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

  return copy;
Wim Taymans's avatar
Wim Taymans committed
220 221
}

222
static GstMessage *
223
gst_message_new (GstMessageType type, GstObject * src)
Wim Taymans's avatar
Wim Taymans committed
224 225 226
{
  GstMessage *message;

227
  message = (GstMessage *) gst_mini_object_new (GST_TYPE_MESSAGE);
Wim Taymans's avatar
Wim Taymans committed
228

229 230
  GST_CAT_INFO (GST_CAT_MESSAGE, "creating new message %p %s", message,
      gst_message_type_get_name (type));
Wim Taymans's avatar
Wim Taymans committed
231

232
  message->type = type;
Wim Taymans's avatar
Wim Taymans committed
233
  if (src) {
234
    message->src = gst_object_ref (src);
235
    GST_CAT_DEBUG_OBJECT (GST_CAT_MESSAGE, src, "message source");
236
  } else {
237
    message->src = NULL;
238
    GST_CAT_DEBUG (GST_CAT_MESSAGE, "NULL message source");
Wim Taymans's avatar
Wim Taymans committed
239
  }
240
  message->structure = NULL;
Wim Taymans's avatar
Wim Taymans committed
241 242 243 244 245 246

  return message;
}

/**
 * gst_message_new_eos:
Stefan Kost's avatar
Stefan Kost committed
247
 * @src: The object originating the message.
Wim Taymans's avatar
Wim Taymans committed
248
 *
249 250 251
 * 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
252 253 254 255 256 257 258 259 260 261
 *
 * Returns: The new eos message.
 *
 * MT safe.
 */
GstMessage *
gst_message_new_eos (GstObject * src)
{
  GstMessage *message;

262
  message = gst_message_new (GST_MESSAGE_EOS, src);
Wim Taymans's avatar
Wim Taymans committed
263 264 265 266 267 268 269 270 271 272

  return message;
}

/**
 * gst_message_new_error:
 * @src: The object originating the message.
 * @error: The GError for this message.
 * @debug: A debugging string for something or other.
 *
273
 * Create a new error message. The message will copy @error and
274 275
 * @debug. This message is posted by element when a fatal event
 * occured. The pipeline will probably (partially) stop. 
Wim Taymans's avatar
Wim Taymans committed
276 277 278 279 280 281 282 283 284 285 286
 *
 * Returns: The new error message.
 *
 * MT safe.
 */
GstMessage *
gst_message_new_error (GstObject * src, GError * error, gchar * debug)
{
  GstMessage *message;
  GstStructure *s;

287
  message = gst_message_new (GST_MESSAGE_ERROR, src);
288 289
  /* gst_structure_new takes copies of the types passed in */
  s = gst_structure_new ("GstMessageError", "gerror", GST_TYPE_G_ERROR, error,
Wim Taymans's avatar
Wim Taymans committed
290
      "debug", G_TYPE_STRING, debug, NULL);
291
  gst_structure_set_parent_refcount (s, &message->mini_object.refcount);
Wim Taymans's avatar
Wim Taymans committed
292 293 294 295 296 297 298 299 300 301 302
  message->structure = s;

  return message;
}

/**
 * gst_message_new_warning:
 * @src: The object originating the message.
 * @error: The GError for this message.
 * @debug: A debugging string for something or other.
 *
303
 * Create a new warning message. The message will make copies of @error and
Wim Taymans's avatar
Wim Taymans committed
304 305 306 307 308 309 310 311 312 313 314 315
 * @debug.
 *
 * Returns: The new warning message.
 *
 * MT safe.
 */
GstMessage *
gst_message_new_warning (GstObject * src, GError * error, gchar * debug)
{
  GstMessage *message;
  GstStructure *s;

316
  message = gst_message_new (GST_MESSAGE_WARNING, src);
317 318
  /* gst_structure_new takes copies of the types passed in */
  s = gst_structure_new ("GstMessageWarning", "gerror", GST_TYPE_G_ERROR, error,
Wim Taymans's avatar
Wim Taymans committed
319
      "debug", G_TYPE_STRING, debug, NULL);
320
  gst_structure_set_parent_refcount (s, &message->mini_object.refcount);
Wim Taymans's avatar
Wim Taymans committed
321 322 323 324 325 326 327 328 329 330 331
  message->structure = s;

  return message;
}

/**
 * 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.
332
 * The message is posted by elements that discovered a new taglist.
Wim Taymans's avatar
Wim Taymans committed
333 334 335 336 337 338 339 340 341 342
 *
 * Returns: The new tag message.
 *
 * MT safe.
 */
GstMessage *
gst_message_new_tag (GstObject * src, GstTagList * tag_list)
{
  GstMessage *message;

343 344
  g_return_val_if_fail (GST_IS_STRUCTURE (tag_list), NULL);

345
  message = gst_message_new (GST_MESSAGE_TAG, src);
346
  gst_structure_set_parent_refcount (tag_list, &message->mini_object.refcount);
Wim Taymans's avatar
Wim Taymans committed
347 348 349 350 351 352 353 354 355 356
  message->structure = tag_list;

  return message;
}

/**
 * gst_message_new_state_change:
 * @src: The object originating the message.
 * @old: The previous state.
 * @new: The new (current) state.
357
 * @pending: The pending (target) state.
Wim Taymans's avatar
Wim Taymans committed
358
 *
359 360
 * Create a state change message. This message is posted whenever an element changed
 * its state.
Wim Taymans's avatar
Wim Taymans committed
361 362 363 364 365 366
 *
 * Returns: The new state change message.
 *
 * MT safe.
 */
GstMessage *
367 368
gst_message_new_state_changed (GstObject * src,
    GstState old, GstState new, GstState pending)
Wim Taymans's avatar
Wim Taymans committed
369 370 371 372
{
  GstMessage *message;
  GstStructure *s;

373
  message = gst_message_new (GST_MESSAGE_STATE_CHANGED, src);
374

375 376 377 378
  s = gst_structure_new ("GstMessageState",
      "old-state", GST_TYPE_STATE, (gint) old,
      "new-state", GST_TYPE_STATE, (gint) new,
      "pending-state", GST_TYPE_STATE, (gint) pending, NULL);
379
  gst_structure_set_parent_refcount (s, &message->mini_object.refcount);
Wim Taymans's avatar
Wim Taymans committed
380 381 382 383 384 385
  message->structure = s;

  return message;
}

/**
386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404
 * gst_message_new_segment_start:
 * @src: The object originating the message.
 * @timestamp: The timestamp of the segment being played
 *
 * 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 *
gst_message_new_segment_start (GstObject * src, GstClockTime timestamp)
{
  GstMessage *message;
  GstStructure *s;

405
  message = gst_message_new (GST_MESSAGE_SEGMENT_START, src);
406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434

  s = gst_structure_new ("GstMessageSegmentStart", "timestamp", G_TYPE_INT64,
      (gint64) timestamp, NULL);
  gst_structure_set_parent_refcount (s, &message->mini_object.refcount);
  message->structure = s;

  return message;
}

/**
 * gst_message_new_segment_done:
 * @src: The object originating the message.
 * @timestamp: The timestamp of the segment being played
 *
 * 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 *
gst_message_new_segment_done (GstObject * src, GstClockTime timestamp)
{
  GstMessage *message;
  GstStructure *s;

435
  message = gst_message_new (GST_MESSAGE_SEGMENT_DONE, src);
436 437 438 439 440 441 442 443 444

  s = gst_structure_new ("GstMessageSegmentDone", "timestamp", G_TYPE_INT64,
      (gint64) timestamp, NULL);
  gst_structure_set_parent_refcount (s, &message->mini_object.refcount);
  message->structure = s;

  return message;
}

445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480
/**
 * 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.
 *
 * 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.
 *
 * MT safe.
 */
GstMessage *
gst_message_new_element (GstObject * src, GstStructure * structure)
{
  return gst_message_new_custom (GST_MESSAGE_ELEMENT, src, structure);
}

481 482
/**
 * gst_message_new_custom:
Stefan Kost's avatar
Stefan Kost committed
483
 * @type: The #GstMessageType to distinguish messages
484
 * @src: The object originating the message.
Wim Taymans's avatar
Wim Taymans committed
485 486 487
 * @structure: The structure for the message. The message will take ownership of
 * the structure.
 *
488 489
 * 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
Wim Taymans's avatar
Wim Taymans committed
490
 * app. The structure field can be NULL.
Wim Taymans's avatar
Wim Taymans committed
491 492 493 494 495 496
 *
 * Returns: The new message.
 *
 * MT safe.
 */
GstMessage *
497
gst_message_new_custom (GstMessageType type, GstObject * src,
498
    GstStructure * structure)
Wim Taymans's avatar
Wim Taymans committed
499 500 501
{
  GstMessage *message;

502
  message = gst_message_new (type, src);
Wim Taymans's avatar
Wim Taymans committed
503 504 505 506 507
  if (structure) {
    gst_structure_set_parent_refcount (structure,
        &message->mini_object.refcount);
    message->structure = structure;
  }
Wim Taymans's avatar
Wim Taymans committed
508 509 510 511 512 513 514 515 516
  return message;
}

/**
 * gst_message_get_structure:
 * @message: The #GstMessage.
 *
 * Access the structure of the message.
 *
517 518 519
 * Returns: The structure of the message. The structure is still
 * owned by the message, which means that you should not free it and 
 * that the pointer becomes invalid when you free the message.
Wim Taymans's avatar
Wim Taymans committed
520 521 522 523 524 525 526
 *
 * MT safe.
 */
const GstStructure *
gst_message_get_structure (GstMessage * message)
{
  g_return_val_if_fail (GST_IS_MESSAGE (message), NULL);
527

Wim Taymans's avatar
Wim Taymans committed
528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549
  return message->structure;
}

/**
 * gst_message_parse_tag:
 * @message: A valid #GstMessage of type GST_MESSAGE_TAG.
 *
 * 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)
{
  g_return_if_fail (GST_IS_MESSAGE (message));
  g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_TAG);

  *tag_list = (GstTagList *) gst_structure_copy (message->structure);
}

/**
550
 * gst_message_parse_state_changed:
Wim Taymans's avatar
Wim Taymans committed
551
 * @message: A valid #GstMessage of type GST_MESSAGE_STATE_CHANGED.
552 553 554
 * @old: The previous state.
 * @new: The new (current) state.
 * @pending: The pending (target) state.
Wim Taymans's avatar
Wim Taymans committed
555 556 557 558 559 560
 *
 * Extracts the old and new states from the GstMessage.
 *
 * MT safe.
 */
void
561
gst_message_parse_state_changed (GstMessage * message, GstState * old,
562
    GstState * new, GstState * pending)
Wim Taymans's avatar
Wim Taymans committed
563 564 565 566
{
  g_return_if_fail (GST_IS_MESSAGE (message));
  g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_STATE_CHANGED);

567 568 569 570 571 572 573 574 575
  if (old)
    gst_structure_get_enum (message->structure, "old-state",
        GST_TYPE_STATE, (gint *) old);
  if (new)
    gst_structure_get_enum (message->structure, "new-state",
        GST_TYPE_STATE, (gint *) new);
  if (pending)
    gst_structure_get_enum (message->structure, "pending-state",
        GST_TYPE_STATE, (gint *) pending);
Wim Taymans's avatar
Wim Taymans committed
576 577 578 579 580 581
}

/**
 * gst_message_parse_error:
 * @message: A valid #GstMessage of type GST_MESSAGE_ERROR.
 *
Wim Taymans's avatar
Wim Taymans committed
582
 * Extracts the GError and debug string from the GstMessage. The values returned
Wim Taymans's avatar
Wim Taymans committed
583 584 585 586 587 588 589 590
 * in the output arguments are copies; the caller must free them when done.
 *
 * MT safe.
 */
void
gst_message_parse_error (GstMessage * message, GError ** gerror, gchar ** debug)
{
  const GValue *error_gvalue;
591
  GError *error_val;
Wim Taymans's avatar
Wim Taymans committed
592 593 594 595 596 597

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

  error_gvalue = gst_structure_get_value (message->structure, "gerror");
  g_return_if_fail (error_gvalue != NULL);
598
  g_return_if_fail (G_VALUE_TYPE (error_gvalue) == GST_TYPE_G_ERROR);
Wim Taymans's avatar
Wim Taymans committed
599

600
  error_val = (GError *) g_value_get_boxed (error_gvalue);
601 602 603 604
  if (error_val)
    *gerror = g_error_copy (error_val);
  else
    *gerror = NULL;
Wim Taymans's avatar
Wim Taymans committed
605 606 607 608 609 610 611
  *debug = g_strdup (gst_structure_get_string (message->structure, "debug"));
}

/**
 * gst_message_parse_warning:
 * @message: A valid #GstMessage of type GST_MESSAGE_WARNING.
 *
Wim Taymans's avatar
Wim Taymans committed
612
 * Extracts the GError and debug string from the GstMessage. The values returned
Wim Taymans's avatar
Wim Taymans committed
613 614 615 616 617 618 619 620 621
 * in the output arguments are copies; the caller must free them when done.
 *
 * MT safe.
 */
void
gst_message_parse_warning (GstMessage * message, GError ** gerror,
    gchar ** debug)
{
  const GValue *error_gvalue;
622
  GError *error_val;
Wim Taymans's avatar
Wim Taymans committed
623 624 625 626 627 628

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

  error_gvalue = gst_structure_get_value (message->structure, "gerror");
  g_return_if_fail (error_gvalue != NULL);
629
  g_return_if_fail (G_VALUE_TYPE (error_gvalue) == GST_TYPE_G_ERROR);
Wim Taymans's avatar
Wim Taymans committed
630

631
  error_val = (GError *) g_value_get_boxed (error_gvalue);
632 633 634 635 636
  if (error_val)
    *gerror = g_error_copy (error_val);
  else
    *gerror = NULL;

Wim Taymans's avatar
Wim Taymans committed
637 638
  *debug = g_strdup (gst_structure_get_string (message->structure, "debug"));
}
639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686

/**
 * gst_message_parse_segment_start:
 * @message: A valid #GstMessage of type GST_MESSAGE_SEGMENT_START.
 *
 * Extracts the timestamp from the segment start message.
 *
 * MT safe.
 */
void
gst_message_parse_segment_start (GstMessage * message, GstClockTime * timestamp)
{
  const GValue *time_gvalue;

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

  time_gvalue = gst_structure_get_value (message->structure, "timstamp");
  g_return_if_fail (time_gvalue != NULL);
  g_return_if_fail (G_VALUE_TYPE (time_gvalue) == G_TYPE_INT64);

  if (timestamp)
    *timestamp = (GstClockTime) g_value_get_int64 (time_gvalue);
}

/**
 * gst_message_parse_segment_done:
 * @message: A valid #GstMessage of type GST_MESSAGE_SEGMENT_DONE.
 *
 * Extracts the timestamp from the segment done message.
 *
 * MT safe.
 */
void
gst_message_parse_segment_done (GstMessage * message, GstClockTime * timestamp)
{
  const GValue *time_gvalue;

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

  time_gvalue = gst_structure_get_value (message->structure, "timstamp");
  g_return_if_fail (time_gvalue != NULL);
  g_return_if_fail (G_VALUE_TYPE (time_gvalue) == G_TYPE_INT64);

  if (timestamp)
    *timestamp = (GstClockTime) g_value_get_int64 (time_gvalue);
}