/usr/include/gstreamer-1.0/gst/gstpad.h is in libgstreamer1.0-dev 1.2.4-0ubuntu1.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 | /* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wim.taymans@chello.be>
*
* gstpad.h: Header for GstPad object
*
* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef __GST_PAD_H__
#define __GST_PAD_H__
#include <gst/gstconfig.h>
typedef struct _GstPad GstPad;
typedef struct _GstPadPrivate GstPadPrivate;
typedef struct _GstPadClass GstPadClass;
typedef struct _GstPadProbeInfo GstPadProbeInfo;
/**
* GstPadDirection:
* @GST_PAD_UNKNOWN: direction is unknown.
* @GST_PAD_SRC: the pad is a source pad.
* @GST_PAD_SINK: the pad is a sink pad.
*
* The direction of a pad.
*/
typedef enum {
GST_PAD_UNKNOWN,
GST_PAD_SRC,
GST_PAD_SINK
} GstPadDirection;
/**
* GstPadMode:
* @GST_PAD_MODE_NONE: Pad will not handle dataflow
* @GST_PAD_MODE_PUSH: Pad handles dataflow in downstream push mode
* @GST_PAD_MODE_PULL: Pad handles dataflow in upstream pull mode
*
* The status of a GstPad. After activating a pad, which usually happens when the
* parent element goes from READY to PAUSED, the GstPadMode defines if the
* pad operates in push or pull mode.
*/
typedef enum {
GST_PAD_MODE_NONE,
GST_PAD_MODE_PUSH,
GST_PAD_MODE_PULL
} GstPadMode;
#include <gst/gstobject.h>
#include <gst/gstbuffer.h>
#include <gst/gstbufferlist.h>
#include <gst/gstcaps.h>
#include <gst/gstpadtemplate.h>
#include <gst/gstevent.h>
#include <gst/gstquery.h>
#include <gst/gsttask.h>
G_BEGIN_DECLS
/*
* Pad base class
*/
#define GST_TYPE_PAD (gst_pad_get_type ())
#define GST_IS_PAD(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_PAD))
#define GST_IS_PAD_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_PAD))
#define GST_PAD(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_PAD, GstPad))
#define GST_PAD_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_PAD, GstPadClass))
#define GST_PAD_CAST(obj) ((GstPad*)(obj))
/**
* GstPadLinkReturn:
* @GST_PAD_LINK_OK : link succeeded
* @GST_PAD_LINK_WRONG_HIERARCHY: pads have no common grandparent
* @GST_PAD_LINK_WAS_LINKED : pad was already linked
* @GST_PAD_LINK_WRONG_DIRECTION: pads have wrong direction
* @GST_PAD_LINK_NOFORMAT : pads do not have common format
* @GST_PAD_LINK_NOSCHED : pads cannot cooperate in scheduling
* @GST_PAD_LINK_REFUSED : refused for some reason
*
* Result values from gst_pad_link and friends.
*/
typedef enum {
GST_PAD_LINK_OK = 0,
GST_PAD_LINK_WRONG_HIERARCHY = -1,
GST_PAD_LINK_WAS_LINKED = -2,
GST_PAD_LINK_WRONG_DIRECTION = -3,
GST_PAD_LINK_NOFORMAT = -4,
GST_PAD_LINK_NOSCHED = -5,
GST_PAD_LINK_REFUSED = -6
} GstPadLinkReturn;
/**
* GST_PAD_LINK_FAILED:
* @ret: the #GstPadLinkReturn value
*
* Macro to test if the given #GstPadLinkReturn value indicates a failed
* link step.
*/
#define GST_PAD_LINK_FAILED(ret) ((ret) < GST_PAD_LINK_OK)
/**
* GST_PAD_LINK_SUCCESSFUL:
* @ret: the #GstPadLinkReturn value
*
* Macro to test if the given #GstPadLinkReturn value indicates a successful
* link step.
*/
#define GST_PAD_LINK_SUCCESSFUL(ret) ((ret) >= GST_PAD_LINK_OK)
/**
* GstFlowReturn:
* @GST_FLOW_OK: Data passing was ok.
* @GST_FLOW_NOT_LINKED: Pad is not linked.
* @GST_FLOW_FLUSHING: Pad is flushing.
* @GST_FLOW_EOS: Pad is EOS.
* @GST_FLOW_NOT_NEGOTIATED: Pad is not negotiated.
* @GST_FLOW_ERROR: Some (fatal) error occured. Element generating
* this error should post an error message with more
* details.
* @GST_FLOW_NOT_SUPPORTED: This operation is not supported.
* @GST_FLOW_CUSTOM_SUCCESS: Elements can use values starting from
* this (and higher) to define custom success
* codes.
* @GST_FLOW_CUSTOM_SUCCESS_1: Pre-defined custom success code (define your
* custom success code to this to avoid compiler
* warnings).
* @GST_FLOW_CUSTOM_SUCCESS_2: Pre-defined custom success code.
* @GST_FLOW_CUSTOM_ERROR: Elements can use values starting from
* this (and lower) to define custom error codes.
* @GST_FLOW_CUSTOM_ERROR_1: Pre-defined custom error code (define your
* custom error code to this to avoid compiler
* warnings).
* @GST_FLOW_CUSTOM_ERROR_2: Pre-defined custom error code.
*
* The result of passing data to a pad.
*
* Note that the custom return values should not be exposed outside of the
* element scope.
*/
typedef enum {
/* custom success starts here */
GST_FLOW_CUSTOM_SUCCESS_2 = 102,
GST_FLOW_CUSTOM_SUCCESS_1 = 101,
GST_FLOW_CUSTOM_SUCCESS = 100,
/* core predefined */
GST_FLOW_OK = 0,
/* expected failures */
GST_FLOW_NOT_LINKED = -1,
GST_FLOW_FLUSHING = -2,
/* error cases */
GST_FLOW_EOS = -3,
GST_FLOW_NOT_NEGOTIATED = -4,
GST_FLOW_ERROR = -5,
GST_FLOW_NOT_SUPPORTED = -6,
/* custom error starts here */
GST_FLOW_CUSTOM_ERROR = -100,
GST_FLOW_CUSTOM_ERROR_1 = -101,
GST_FLOW_CUSTOM_ERROR_2 = -102
} GstFlowReturn;
const gchar* gst_flow_get_name (GstFlowReturn ret);
GQuark gst_flow_to_quark (GstFlowReturn ret);
/**
* GstPadLinkCheck:
* @GST_PAD_LINK_CHECK_NOTHING: Don't check hierarchy or caps compatibility.
* @GST_PAD_LINK_CHECK_HIERARCHY: Check the pads have same parents/grandparents.
* Could be omitted if it is already known that the two elements that own the
* pads are in the same bin.
* @GST_PAD_LINK_CHECK_TEMPLATE_CAPS: Check if the pads are compatible by using
* their template caps. This is much faster than @GST_PAD_LINK_CHECK_CAPS, but
* would be unsafe e.g. if one pad has %GST_CAPS_ANY.
* @GST_PAD_LINK_CHECK_CAPS: Check if the pads are compatible by comparing the
* caps returned by gst_pad_query_caps().
* @GST_PAD_LINK_CHECK_DEFAULT: The default checks done when linking
* pads (i.e. the ones used by gst_pad_link()).
*
* The amount of checking to be done when linking pads. @GST_PAD_LINK_CHECK_CAPS
* and @GST_PAD_LINK_CHECK_TEMPLATE_CAPS are mutually exclusive. If both are
* specified, expensive but safe @GST_PAD_LINK_CHECK_CAPS are performed.
*
* <warning><para>
* Only disable some of the checks if you are 100% certain you know the link
* will not fail because of hierarchy/caps compatibility failures. If uncertain,
* use the default checks (%GST_PAD_LINK_CHECK_DEFAULT) or the regular methods
* for linking the pads.
* </para></warning>
*/
typedef enum {
GST_PAD_LINK_CHECK_NOTHING = 0,
GST_PAD_LINK_CHECK_HIERARCHY = 1 << 0,
GST_PAD_LINK_CHECK_TEMPLATE_CAPS = 1 << 1,
GST_PAD_LINK_CHECK_CAPS = 1 << 2,
GST_PAD_LINK_CHECK_DEFAULT = GST_PAD_LINK_CHECK_HIERARCHY | GST_PAD_LINK_CHECK_CAPS
} GstPadLinkCheck;
/* pad states */
/**
* GstPadActivateFunction:
* @pad: a #GstPad
* @parent: the parent of @pad
*
* This function is called when the pad is activated during the element
* READY to PAUSED state change. By default this function will call the
* activate function that puts the pad in push mode but elements can
* override this function to activate the pad in pull mode if they wish.
*
* Returns: TRUE if the pad could be activated.
*/
typedef gboolean (*GstPadActivateFunction) (GstPad *pad, GstObject *parent);
/**
* GstPadActivateModeFunction:
* @pad: a #GstPad
* @parent: the parent of @pad
* @mode: the requested activation mode of @pad
* @active: activate or deactivate the pad.
*
* The prototype of the push and pull activate functions.
*
* Returns: TRUE if the pad could be activated or deactivated.
*/
typedef gboolean (*GstPadActivateModeFunction) (GstPad *pad, GstObject *parent,
GstPadMode mode, gboolean active);
/* data passing */
/**
* GstPadChainFunction:
* @pad: the sink #GstPad that performed the chain.
* @parent: the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT flag is set,
* @parent is guaranteed to be not-NULL and remain valid during the
* execution of this function.
* @buffer: the #GstBuffer that is chained, not %NULL.
*
* A function that will be called on sinkpads when chaining buffers.
* The function typically processes the data contained in the buffer and
* either consumes the data or passes it on to the internally linked pad(s).
*
* The implementer of this function receives a refcount to @buffer and should
* gst_buffer_unref() when the buffer is no longer needed.
*
* When a chain function detects an error in the data stream, it must post an
* error on the bus and return an appropriate #GstFlowReturn value.
*
* Returns: #GST_FLOW_OK for success
*/
typedef GstFlowReturn (*GstPadChainFunction) (GstPad *pad, GstObject *parent,
GstBuffer *buffer);
/**
* GstPadChainListFunction:
* @pad: the sink #GstPad that performed the chain.
* @parent: the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT flag is set,
* @parent is guaranteed to be not-NULL and remain valid during the
* execution of this function.
* @list: the #GstBufferList that is chained, not %NULL.
*
* A function that will be called on sinkpads when chaining buffer lists.
* The function typically processes the data contained in the buffer list and
* either consumes the data or passes it on to the internally linked pad(s).
*
* The implementer of this function receives a refcount to @list and
* should gst_buffer_list_unref() when the list is no longer needed.
*
* When a chainlist function detects an error in the data stream, it must
* post an error on the bus and return an appropriate #GstFlowReturn value.
*
* Returns: #GST_FLOW_OK for success
*/
typedef GstFlowReturn (*GstPadChainListFunction) (GstPad *pad, GstObject *parent,
GstBufferList *list);
/**
* GstPadGetRangeFunction:
* @pad: the src #GstPad to perform the getrange on.
* @parent: the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT flag is set,
* @parent is guaranteed to be not-NULL and remain valid during the
* execution of this function.
* @offset: the offset of the range
* @length: the length of the range
* @buffer: a memory location to hold the result buffer, cannot be NULL.
*
* This function will be called on source pads when a peer element
* request a buffer at the specified @offset and @length. If this function
* returns #GST_FLOW_OK, the result buffer will be stored in @buffer. The
* contents of @buffer is invalid for any other return value.
*
* This function is installed on a source pad with
* gst_pad_set_getrange_function() and can only be called on source pads after
* they are successfully activated with gst_pad_activate_mode() with the
* #GST_PAD_MODE_PULL.
*
* @offset and @length are always given in byte units. @offset must normally be a value
* between 0 and the length in bytes of the data available on @pad. The
* length (duration in bytes) can be retrieved with a #GST_QUERY_DURATION or with a
* #GST_QUERY_SEEKING.
*
* Any @offset larger or equal than the length will make the function return
* #GST_FLOW_EOS, which corresponds to EOS. In this case @buffer does not
* contain a valid buffer.
*
* The buffer size of @buffer will only be smaller than @length when @offset is
* near the end of the stream. In all other cases, the size of @buffer must be
* exactly the requested size.
*
* It is allowed to call this function with a 0 @length and valid @offset, in
* which case @buffer will contain a 0-sized buffer and the function returns
* #GST_FLOW_OK.
*
* When this function is called with a -1 @offset, the sequentially next buffer
* of length @length in the stream is returned.
*
* When this function is called with a -1 @length, a buffer with a default
* optimal length is returned in @buffer. The length might depend on the value
* of @offset.
*
* Returns: #GST_FLOW_OK for success and a valid buffer in @buffer. Any other
* return value leaves @buffer undefined.
*/
typedef GstFlowReturn (*GstPadGetRangeFunction) (GstPad *pad, GstObject *parent,
guint64 offset, guint length,
GstBuffer **buffer);
/**
* GstPadEventFunction:
* @pad: the #GstPad to handle the event.
* @parent: the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT flag is set,
* @parent is guaranteed to be not-NULL and remain valid during the
* execution of this function.
* @event: the #GstEvent to handle.
*
* Function signature to handle an event for the pad.
*
* Returns: TRUE if the pad could handle the event.
*/
typedef gboolean (*GstPadEventFunction) (GstPad *pad, GstObject *parent,
GstEvent *event);
/* internal links */
/**
* GstPadIterIntLinkFunction:
* @pad: The #GstPad to query.
* @parent: the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT flag is set,
* @parent is guaranteed to be not-NULL and remain valid during the
* execution of this function.
*
* The signature of the internal pad link iterator function.
*
* Returns: a new #GstIterator that will iterate over all pads that are
* linked to the given pad on the inside of the parent element.
*
* the caller must call gst_iterator_free() after usage.
*/
typedef GstIterator* (*GstPadIterIntLinkFunction) (GstPad *pad, GstObject *parent);
/* generic query function */
/**
* GstPadQueryFunction:
* @pad: the #GstPad to query.
* @parent: the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT flag is set,
* @parent is guaranteed to be not-NULL and remain valid during the
* execution of this function.
* @query: the #GstQuery object to execute
*
* The signature of the query function.
*
* Returns: TRUE if the query could be performed.
*/
typedef gboolean (*GstPadQueryFunction) (GstPad *pad, GstObject *parent,
GstQuery *query);
/* linking */
/**
* GstPadLinkFunction:
* @pad: the #GstPad that is linked.
* @parent: the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT flag is set,
* @parent is guaranteed to be not-NULL and remain valid during the
* execution of this function.
* @peer: the peer #GstPad of the link
*
* Function signature to handle a new link on the pad.
*
* Returns: the result of the link with the specified peer.
*/
typedef GstPadLinkReturn (*GstPadLinkFunction) (GstPad *pad, GstObject *parent, GstPad *peer);
/**
* GstPadUnlinkFunction:
* @pad: the #GstPad that is linked.
* @parent: the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT flag is set,
* @parent is guaranteed to be not-NULL and remain valid during the
* execution of this function.
*
* Function signature to handle a unlinking the pad prom its peer.
*/
typedef void (*GstPadUnlinkFunction) (GstPad *pad, GstObject *parent);
/* misc */
/**
* GstPadForwardFunction:
* @pad: the #GstPad that is forwarded.
* @user_data: the gpointer to optional user data.
*
* A forward function is called for all internally linked pads, see
* gst_pad_forward().
*
* Returns: TRUE if the dispatching procedure has to be stopped.
*/
typedef gboolean (*GstPadForwardFunction) (GstPad *pad, gpointer user_data);
/**
* GstPadProbeType:
* @GST_PAD_PROBE_TYPE_INVALID: invalid probe type
* @GST_PAD_PROBE_TYPE_IDLE: probe idle pads and block
* @GST_PAD_PROBE_TYPE_BLOCK: probe and block pads
* @GST_PAD_PROBE_TYPE_BUFFER: probe buffers
* @GST_PAD_PROBE_TYPE_BUFFER_LIST: probe buffer lists
* @GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM: probe downstream events
* @GST_PAD_PROBE_TYPE_EVENT_UPSTREAM: probe upstream events
* @GST_PAD_PROBE_TYPE_EVENT_FLUSH: probe flush events. This probe has to be
* explicitly enabled and is not included in the
* @@GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM or
* @@GST_PAD_PROBE_TYPE_EVENT_UPSTREAM probe types.
* @GST_PAD_PROBE_TYPE_QUERY_DOWNSTREAM: probe downstream queries
* @GST_PAD_PROBE_TYPE_QUERY_UPSTREAM: probe upstream queries
* @GST_PAD_PROBE_TYPE_PUSH: probe push
* @GST_PAD_PROBE_TYPE_PULL: probe pull
* @GST_PAD_PROBE_TYPE_BLOCKING: probe and block at the next opportunity, at data flow or when idle
* @GST_PAD_PROBE_TYPE_DATA_DOWNSTREAM: probe downstream data (buffers, buffer lists, and events)
* @GST_PAD_PROBE_TYPE_DATA_UPSTREAM: probe upstream data (events)
* @GST_PAD_PROBE_TYPE_DATA_BOTH: probe upstream and downstream data (buffers, buffer lists, and events)
* @GST_PAD_PROBE_TYPE_BLOCK_DOWNSTREAM: probe and block downstream data (buffers, buffer lists, and events)
* @GST_PAD_PROBE_TYPE_BLOCK_UPSTREAM: probe and block upstream data (events)
* @GST_PAD_PROBE_TYPE_EVENT_BOTH: probe upstream and downstream events
* @GST_PAD_PROBE_TYPE_QUERY_BOTH: probe upstream and downstream queries
* @GST_PAD_PROBE_TYPE_ALL_BOTH: probe upstream events and queries and downstream buffers, buffer lists, events and queries
* @GST_PAD_PROBE_TYPE_SCHEDULING: probe push and pull
*
* The different probing types that can occur. When either one of
* @GST_PAD_PROBE_TYPE_IDLE or @GST_PAD_PROBE_TYPE_BLOCK is used, the probe will be a
* blocking probe.
*/
typedef enum
{
GST_PAD_PROBE_TYPE_INVALID = 0,
/* flags to control blocking */
GST_PAD_PROBE_TYPE_IDLE = (1 << 0),
GST_PAD_PROBE_TYPE_BLOCK = (1 << 1),
/* flags to select datatypes */
GST_PAD_PROBE_TYPE_BUFFER = (1 << 4),
GST_PAD_PROBE_TYPE_BUFFER_LIST = (1 << 5),
GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM = (1 << 6),
GST_PAD_PROBE_TYPE_EVENT_UPSTREAM = (1 << 7),
GST_PAD_PROBE_TYPE_EVENT_FLUSH = (1 << 8),
GST_PAD_PROBE_TYPE_QUERY_DOWNSTREAM = (1 << 9),
GST_PAD_PROBE_TYPE_QUERY_UPSTREAM = (1 << 10),
/* flags to select scheduling mode */
GST_PAD_PROBE_TYPE_PUSH = (1 << 12),
GST_PAD_PROBE_TYPE_PULL = (1 << 13),
/* flag combinations */
GST_PAD_PROBE_TYPE_BLOCKING = GST_PAD_PROBE_TYPE_IDLE | GST_PAD_PROBE_TYPE_BLOCK,
GST_PAD_PROBE_TYPE_DATA_DOWNSTREAM = GST_PAD_PROBE_TYPE_BUFFER | GST_PAD_PROBE_TYPE_BUFFER_LIST | GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM,
GST_PAD_PROBE_TYPE_DATA_UPSTREAM = GST_PAD_PROBE_TYPE_EVENT_UPSTREAM,
GST_PAD_PROBE_TYPE_DATA_BOTH = GST_PAD_PROBE_TYPE_DATA_DOWNSTREAM | GST_PAD_PROBE_TYPE_DATA_UPSTREAM,
GST_PAD_PROBE_TYPE_BLOCK_DOWNSTREAM = GST_PAD_PROBE_TYPE_BLOCK | GST_PAD_PROBE_TYPE_DATA_DOWNSTREAM,
GST_PAD_PROBE_TYPE_BLOCK_UPSTREAM = GST_PAD_PROBE_TYPE_BLOCK | GST_PAD_PROBE_TYPE_DATA_UPSTREAM,
GST_PAD_PROBE_TYPE_EVENT_BOTH = GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM | GST_PAD_PROBE_TYPE_EVENT_UPSTREAM,
GST_PAD_PROBE_TYPE_QUERY_BOTH = GST_PAD_PROBE_TYPE_QUERY_DOWNSTREAM | GST_PAD_PROBE_TYPE_QUERY_UPSTREAM,
GST_PAD_PROBE_TYPE_ALL_BOTH = GST_PAD_PROBE_TYPE_DATA_BOTH | GST_PAD_PROBE_TYPE_QUERY_BOTH,
GST_PAD_PROBE_TYPE_SCHEDULING = GST_PAD_PROBE_TYPE_PUSH | GST_PAD_PROBE_TYPE_PULL
} GstPadProbeType;
/**
* GstPadProbeReturn:
* @GST_PAD_PROBE_OK: normal probe return value
* @GST_PAD_PROBE_DROP: drop data in data probes. For push mode this means that
* the data item is not sent downstream. For pull mode, it means that the
* data item is not passed upstream. In both cases, this result code
* returns #GST_FLOW_OK or %TRUE to the caller.
* @GST_PAD_PROBE_REMOVE: remove probe
* @GST_PAD_PROBE_PASS: pass the data item in the block probe and block on
* the next item
*
* Different return values for the #GstPadProbeCallback.
*/
typedef enum
{
GST_PAD_PROBE_DROP,
GST_PAD_PROBE_OK,
GST_PAD_PROBE_REMOVE,
GST_PAD_PROBE_PASS,
} GstPadProbeReturn;
/**
* GstPadProbeInfo:
* @type: the current probe type
* @id: the id of the probe
* @data: type specific data, check the @type field to know the datatype.
* This field can be NULL.
* @offset: offset of pull probe, this field is valid when @type contains
* #GST_PAD_PROBE_TYPE_PULL
* @size: size of pull probe, this field is valid when @type contains
* #GST_PAD_PROBE_TYPE_PULL
*
* Info passed in the #GstPadProbeCallback.
*/
struct _GstPadProbeInfo
{
GstPadProbeType type;
gulong id;
gpointer data;
guint64 offset;
guint size;
/*< private >*/
gpointer _gst_reserved[GST_PADDING];
};
#define GST_PAD_PROBE_INFO_TYPE(d) ((d)->type)
#define GST_PAD_PROBE_INFO_ID(d) ((d)->id)
#define GST_PAD_PROBE_INFO_DATA(d) ((d)->data)
#define GST_PAD_PROBE_INFO_BUFFER(d) GST_BUFFER_CAST(GST_PAD_PROBE_INFO_DATA(d))
#define GST_PAD_PROBE_INFO_BUFFER_LIST(d) GST_BUFFER_LIST_CAST(GST_PAD_PROBE_INFO_DATA(d))
#define GST_PAD_PROBE_INFO_EVENT(d) GST_EVENT_CAST(GST_PAD_PROBE_INFO_DATA(d))
#define GST_PAD_PROBE_INFO_QUERY(d) GST_QUERY_CAST(GST_PAD_PROBE_INFO_DATA(d))
#define GST_PAD_PROBE_INFO_OFFSET(d) ((d)->offset)
#define GST_PAD_PROBE_INFO_SIZE(d) ((d)->size)
GstEvent* gst_pad_probe_info_get_event (GstPadProbeInfo * info);
GstQuery* gst_pad_probe_info_get_query (GstPadProbeInfo * info);
GstBuffer* gst_pad_probe_info_get_buffer (GstPadProbeInfo * info);
GstBufferList* gst_pad_probe_info_get_buffer_list (GstPadProbeInfo * info);
/**
* GstPadProbeCallback:
* @pad: the #GstPad that is blocked
* @info: #GstPadProbeInfo
* @user_data: the gpointer to optional user data.
*
* Callback used by gst_pad_add_probe(). Gets called to notify about the current
* blocking type.
*
* The callback is allowed to modify the data pointer in @info.
*
* Returns: a #GstPadProbeReturn
*/
typedef GstPadProbeReturn (*GstPadProbeCallback) (GstPad *pad, GstPadProbeInfo *info,
gpointer user_data);
/**
* GstPadStickyEventsForeachFunction:
* @pad: the #GstPad.
* @event: a sticky #GstEvent.
* @user_data: the #gpointer to optional user data.
*
* Callback used by gst_pad_sticky_events_foreach().
*
* When this function returns %TRUE, the next event will be
* returned. When %FALSE is returned, gst_pad_sticky_events_foreach() will return.
*
* When @event is set to NULL, the item will be removed from the list of sticky events.
* @event can be replaced by assigning a new reference to it.
* This function is responsible for unreffing the old event when
* removing or modifying.
*
* Returns: %TRUE if the iteration should continue
*/
typedef gboolean (*GstPadStickyEventsForeachFunction) (GstPad *pad, GstEvent **event,
gpointer user_data);
/**
* GstPadFlags:
* @GST_PAD_FLAG_BLOCKED: is dataflow on a pad blocked
* @GST_PAD_FLAG_FLUSHING: is pad flushing
* @GST_PAD_FLAG_EOS: is pad in EOS state
* @GST_PAD_FLAG_BLOCKING: is pad currently blocking on a buffer or event
* @GST_PAD_FLAG_NEED_PARENT: ensure that there is a parent object before calling
* into the pad callbacks.
* @GST_PAD_FLAG_NEED_RECONFIGURE: the pad should be reconfigured/renegotiated.
* The flag has to be unset manually after
* reconfiguration happened.
* @GST_PAD_FLAG_PENDING_EVENTS: the pad has pending events
* @GST_PAD_FLAG_FIXED_CAPS: the pad is using fixed caps this means that once the
* caps are set on the pad, the caps query function only
* returns those caps.
* @GST_PAD_FLAG_PROXY_CAPS: the default event and query handler will forward
* all events and queries to the internally linked pads
* instead of discarding them.
* @GST_PAD_FLAG_PROXY_ALLOCATION: the default query handler will forward
* allocation queries to the internally linked pads
* instead of discarding them.
* @GST_PAD_FLAG_PROXY_SCHEDULING: the default query handler will forward
* scheduling queries to the internally linked pads
* instead of discarding them.
* @GST_PAD_FLAG_LAST: offset to define more flags
*
* Pad state flags
*/
typedef enum {
GST_PAD_FLAG_BLOCKED = (GST_OBJECT_FLAG_LAST << 0),
GST_PAD_FLAG_FLUSHING = (GST_OBJECT_FLAG_LAST << 1),
GST_PAD_FLAG_EOS = (GST_OBJECT_FLAG_LAST << 2),
GST_PAD_FLAG_BLOCKING = (GST_OBJECT_FLAG_LAST << 3),
GST_PAD_FLAG_NEED_PARENT = (GST_OBJECT_FLAG_LAST << 4),
GST_PAD_FLAG_NEED_RECONFIGURE = (GST_OBJECT_FLAG_LAST << 5),
GST_PAD_FLAG_PENDING_EVENTS = (GST_OBJECT_FLAG_LAST << 6),
GST_PAD_FLAG_FIXED_CAPS = (GST_OBJECT_FLAG_LAST << 7),
GST_PAD_FLAG_PROXY_CAPS = (GST_OBJECT_FLAG_LAST << 8),
GST_PAD_FLAG_PROXY_ALLOCATION = (GST_OBJECT_FLAG_LAST << 9),
GST_PAD_FLAG_PROXY_SCHEDULING = (GST_OBJECT_FLAG_LAST << 10),
/* padding */
GST_PAD_FLAG_LAST = (GST_OBJECT_FLAG_LAST << 16)
} GstPadFlags;
/**
* GstPad:
* @element_private: private data owned by the parent element
* @padtemplate: padtemplate for this pad
* @direction: the direction of the pad, cannot change after creating
* the pad.
*
* The #GstPad structure. Use the functions to update the variables.
*/
struct _GstPad {
GstObject object;
/*< public >*/
gpointer element_private;
GstPadTemplate *padtemplate;
GstPadDirection direction;
/*< private >*/
/* streaming rec_lock */
GRecMutex stream_rec_lock;
GstTask *task;
/* block cond, mutex is from the object */
GCond block_cond;
GHookList probes;
GstPadMode mode;
GstPadActivateFunction activatefunc;
gpointer activatedata;
GDestroyNotify activatenotify;
GstPadActivateModeFunction activatemodefunc;
gpointer activatemodedata;
GDestroyNotify activatemodenotify;
/* pad link */
GstPad *peer;
GstPadLinkFunction linkfunc;
gpointer linkdata;
GDestroyNotify linknotify;
GstPadUnlinkFunction unlinkfunc;
gpointer unlinkdata;
GDestroyNotify unlinknotify;
/* data transport functions */
GstPadChainFunction chainfunc;
gpointer chaindata;
GDestroyNotify chainnotify;
GstPadChainListFunction chainlistfunc;
gpointer chainlistdata;
GDestroyNotify chainlistnotify;
GstPadGetRangeFunction getrangefunc;
gpointer getrangedata;
GDestroyNotify getrangenotify;
GstPadEventFunction eventfunc;
gpointer eventdata;
GDestroyNotify eventnotify;
/* pad offset */
gint64 offset;
/* generic query method */
GstPadQueryFunction queryfunc;
gpointer querydata;
GDestroyNotify querynotify;
/* internal links */
GstPadIterIntLinkFunction iterintlinkfunc;
gpointer iterintlinkdata;
GDestroyNotify iterintlinknotify;
/* counts number of probes attached. */
gint num_probes;
gint num_blocked;
GstPadPrivate *priv;
gpointer _gst_reserved[GST_PADDING];
};
struct _GstPadClass {
GstObjectClass parent_class;
/* signal callbacks */
void (*linked) (GstPad *pad, GstPad *peer);
void (*unlinked) (GstPad *pad, GstPad *peer);
/*< private >*/
gpointer _gst_reserved[GST_PADDING];
};
/***** helper macros *****/
/* GstPad */
#define GST_PAD_NAME(pad) (GST_OBJECT_NAME(pad))
#define GST_PAD_PARENT(pad) (GST_ELEMENT_CAST(GST_OBJECT_PARENT(pad)))
#define GST_PAD_ELEMENT_PRIVATE(pad) (GST_PAD_CAST(pad)->element_private)
#define GST_PAD_PAD_TEMPLATE(pad) (GST_PAD_CAST(pad)->padtemplate)
#define GST_PAD_DIRECTION(pad) (GST_PAD_CAST(pad)->direction)
#define GST_PAD_TASK(pad) (GST_PAD_CAST(pad)->task)
#define GST_PAD_MODE(pad) (GST_PAD_CAST(pad)->mode)
#define GST_PAD_ACTIVATEFUNC(pad) (GST_PAD_CAST(pad)->activatefunc)
#define GST_PAD_ACTIVATEMODEFUNC(pad) (GST_PAD_CAST(pad)->activatemodefunc)
#define GST_PAD_CHAINFUNC(pad) (GST_PAD_CAST(pad)->chainfunc)
#define GST_PAD_CHAINLISTFUNC(pad) (GST_PAD_CAST(pad)->chainlistfunc)
#define GST_PAD_GETRANGEFUNC(pad) (GST_PAD_CAST(pad)->getrangefunc)
#define GST_PAD_EVENTFUNC(pad) (GST_PAD_CAST(pad)->eventfunc)
#define GST_PAD_QUERYFUNC(pad) (GST_PAD_CAST(pad)->queryfunc)
#define GST_PAD_ITERINTLINKFUNC(pad) (GST_PAD_CAST(pad)->iterintlinkfunc)
#define GST_PAD_PEER(pad) (GST_PAD_CAST(pad)->peer)
#define GST_PAD_LINKFUNC(pad) (GST_PAD_CAST(pad)->linkfunc)
#define GST_PAD_UNLINKFUNC(pad) (GST_PAD_CAST(pad)->unlinkfunc)
#define GST_PAD_IS_SRC(pad) (GST_PAD_DIRECTION(pad) == GST_PAD_SRC)
#define GST_PAD_IS_SINK(pad) (GST_PAD_DIRECTION(pad) == GST_PAD_SINK)
#define GST_PAD_IS_LINKED(pad) (GST_PAD_PEER(pad) != NULL)
#define GST_PAD_IS_ACTIVE(pad) (GST_PAD_MODE(pad) != GST_PAD_MODE_NONE)
#define GST_PAD_IS_BLOCKED(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_BLOCKED))
#define GST_PAD_IS_BLOCKING(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_BLOCKING))
#define GST_PAD_IS_FLUSHING(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_FLUSHING))
#define GST_PAD_SET_FLUSHING(pad) (GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_FLUSHING))
#define GST_PAD_UNSET_FLUSHING(pad) (GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_FLUSHING))
#define GST_PAD_IS_EOS(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_EOS))
#define GST_PAD_NEEDS_RECONFIGURE(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_NEED_RECONFIGURE))
#define GST_PAD_HAS_PENDING_EVENTS(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_PENDING_EVENTS))
#define GST_PAD_IS_FIXED_CAPS(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_FIXED_CAPS))
#define GST_PAD_NEEDS_PARENT(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_NEED_PARENT))
#define GST_PAD_IS_PROXY_CAPS(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_PROXY_CAPS))
#define GST_PAD_SET_PROXY_CAPS(pad) (GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_PROXY_CAPS))
#define GST_PAD_UNSET_PROXY_CAPS(pad) (GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_PROXY_CAPS))
#define GST_PAD_IS_PROXY_ALLOCATION(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_PROXY_ALLOCATION))
#define GST_PAD_SET_PROXY_ALLOCATION(pad) (GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_PROXY_ALLOCATION))
#define GST_PAD_UNSET_PROXY_ALLOCATION(pad) (GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_PROXY_ALLOCATION))
#define GST_PAD_IS_PROXY_SCHEDULING(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_PROXY_SCHEDULING))
#define GST_PAD_SET_PROXY_SCHEDULING(pad) (GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_PROXY_SCHEDULING))
#define GST_PAD_UNSET_PROXY_SCHEDULING(pad) (GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_PROXY_SCHEDULING))
/**
* GST_PAD_GET_STREAM_LOCK:
* @pad: a #GstPad
*
* Get the stream lock of @pad. The stream lock is protecting the
* resources used in the data processing functions of @pad.
*/
#define GST_PAD_GET_STREAM_LOCK(pad) (&(GST_PAD_CAST(pad)->stream_rec_lock))
/**
* GST_PAD_STREAM_LOCK:
* @pad: a #GstPad
*
* Lock the stream lock of @pad.
*/
#define GST_PAD_STREAM_LOCK(pad) g_rec_mutex_lock(GST_PAD_GET_STREAM_LOCK(pad))
/**
* GST_PAD_STREAM_TRYLOCK:
* @pad: a #GstPad
*
* Try to Lock the stream lock of the pad, return TRUE if the lock could be
* taken.
*/
#define GST_PAD_STREAM_TRYLOCK(pad) g_rec_mutex_trylock(GST_PAD_GET_STREAM_LOCK(pad))
/**
* GST_PAD_STREAM_UNLOCK:
* @pad: a #GstPad
*
* Unlock the stream lock of @pad.
*/
#define GST_PAD_STREAM_UNLOCK(pad) g_rec_mutex_unlock(GST_PAD_GET_STREAM_LOCK(pad))
#define GST_PAD_BLOCK_GET_COND(pad) (&GST_PAD_CAST(pad)->block_cond)
#define GST_PAD_BLOCK_WAIT(pad) (g_cond_wait(GST_PAD_BLOCK_GET_COND (pad), GST_OBJECT_GET_LOCK (pad)))
#define GST_PAD_BLOCK_SIGNAL(pad) (g_cond_signal(GST_PAD_BLOCK_GET_COND (pad)))
#define GST_PAD_BLOCK_BROADCAST(pad) (g_cond_broadcast(GST_PAD_BLOCK_GET_COND (pad)))
GType gst_pad_get_type (void);
/* creating pads */
GstPad* gst_pad_new (const gchar *name, GstPadDirection direction);
GstPad* gst_pad_new_from_template (GstPadTemplate *templ, const gchar *name);
GstPad* gst_pad_new_from_static_template (GstStaticPadTemplate *templ, const gchar *name);
/**
* gst_pad_get_name:
* @pad: the pad to get the name from
*
* Get a copy of the name of the pad. g_free() after usage.
*
* MT safe.
*/
#define gst_pad_get_name(pad) gst_object_get_name (GST_OBJECT_CAST (pad))
/**
* gst_pad_get_parent:
* @pad: the pad to get the parent of
*
* Get the parent of @pad. This function increases the refcount
* of the parent object so you should gst_object_unref() it after usage.
* Can return NULL if the pad did not have a parent.
*
* MT safe.
*/
#define gst_pad_get_parent(pad) gst_object_get_parent (GST_OBJECT_CAST (pad))
GstPadDirection gst_pad_get_direction (GstPad *pad);
gboolean gst_pad_set_active (GstPad *pad, gboolean active);
gboolean gst_pad_is_active (GstPad *pad);
gboolean gst_pad_activate_mode (GstPad *pad, GstPadMode mode,
gboolean active);
gulong gst_pad_add_probe (GstPad *pad,
GstPadProbeType mask,
GstPadProbeCallback callback,
gpointer user_data,
GDestroyNotify destroy_data);
void gst_pad_remove_probe (GstPad *pad, gulong id);
gboolean gst_pad_is_blocked (GstPad *pad);
gboolean gst_pad_is_blocking (GstPad *pad);
void gst_pad_mark_reconfigure (GstPad *pad);
gboolean gst_pad_needs_reconfigure (GstPad *pad);
gboolean gst_pad_check_reconfigure (GstPad *pad);
void gst_pad_set_element_private (GstPad *pad, gpointer priv);
gpointer gst_pad_get_element_private (GstPad *pad);
GstPadTemplate* gst_pad_get_pad_template (GstPad *pad);
GstFlowReturn gst_pad_store_sticky_event (GstPad *pad, GstEvent *event);
GstEvent* gst_pad_get_sticky_event (GstPad *pad, GstEventType event_type,
guint idx);
void gst_pad_sticky_events_foreach (GstPad *pad, GstPadStickyEventsForeachFunction foreach_func, gpointer user_data);
/* data passing setup functions */
void gst_pad_set_activate_function_full (GstPad *pad,
GstPadActivateFunction activate,
gpointer user_data,
GDestroyNotify notify);
void gst_pad_set_activatemode_function_full (GstPad *pad,
GstPadActivateModeFunction activatemode,
gpointer user_data,
GDestroyNotify notify);
/* data passing functions */
void gst_pad_set_chain_function_full (GstPad *pad,
GstPadChainFunction chain,
gpointer user_data,
GDestroyNotify notify);
void gst_pad_set_chain_list_function_full (GstPad *pad,
GstPadChainListFunction chainlist,
gpointer user_data,
GDestroyNotify notify);
void gst_pad_set_getrange_function_full (GstPad *pad,
GstPadGetRangeFunction get,
gpointer user_data,
GDestroyNotify notify);
void gst_pad_set_event_function_full (GstPad *pad,
GstPadEventFunction event,
gpointer user_data,
GDestroyNotify notify);
#define gst_pad_set_activate_function(p,f) gst_pad_set_activate_function_full((p),(f),NULL,NULL)
#define gst_pad_set_activatemode_function(p,f) gst_pad_set_activatemode_function_full((p),(f),NULL,NULL)
#define gst_pad_set_chain_function(p,f) gst_pad_set_chain_function_full((p),(f),NULL,NULL)
#define gst_pad_set_chain_list_function(p,f) gst_pad_set_chain_list_function_full((p),(f),NULL,NULL)
#define gst_pad_set_getrange_function(p,f) gst_pad_set_getrange_function_full((p),(f),NULL,NULL)
#define gst_pad_set_event_function(p,f) gst_pad_set_event_function_full((p),(f),NULL,NULL)
/* pad links */
void gst_pad_set_link_function_full (GstPad *pad,
GstPadLinkFunction link,
gpointer user_data,
GDestroyNotify notify);
void gst_pad_set_unlink_function_full (GstPad *pad,
GstPadUnlinkFunction unlink,
gpointer user_data,
GDestroyNotify notify);
#define gst_pad_set_link_function(p,f) gst_pad_set_link_function_full((p),(f),NULL,NULL)
#define gst_pad_set_unlink_function(p,f) gst_pad_set_unlink_function_full((p),(f),NULL,NULL)
gboolean gst_pad_can_link (GstPad *srcpad, GstPad *sinkpad);
GstPadLinkReturn gst_pad_link (GstPad *srcpad, GstPad *sinkpad);
GstPadLinkReturn gst_pad_link_full (GstPad *srcpad, GstPad *sinkpad, GstPadLinkCheck flags);
gboolean gst_pad_unlink (GstPad *srcpad, GstPad *sinkpad);
gboolean gst_pad_is_linked (GstPad *pad);
GstPad* gst_pad_get_peer (GstPad *pad);
GstCaps* gst_pad_get_pad_template_caps (GstPad *pad);
/* capsnego function for linked/unlinked pads */
GstCaps * gst_pad_get_current_caps (GstPad * pad);
gboolean gst_pad_has_current_caps (GstPad * pad);
/* capsnego for linked pads */
GstCaps * gst_pad_get_allowed_caps (GstPad * pad);
/* pad offsets */
gint64 gst_pad_get_offset (GstPad *pad);
void gst_pad_set_offset (GstPad *pad, gint64 offset);
/* data passing functions to peer */
GstFlowReturn gst_pad_push (GstPad *pad, GstBuffer *buffer);
GstFlowReturn gst_pad_push_list (GstPad *pad, GstBufferList *list);
GstFlowReturn gst_pad_pull_range (GstPad *pad, guint64 offset, guint size,
GstBuffer **buffer);
gboolean gst_pad_push_event (GstPad *pad, GstEvent *event);
gboolean gst_pad_event_default (GstPad *pad, GstObject *parent,
GstEvent *event);
/* data passing functions on pad */
GstFlowReturn gst_pad_chain (GstPad *pad, GstBuffer *buffer);
GstFlowReturn gst_pad_chain_list (GstPad *pad, GstBufferList *list);
GstFlowReturn gst_pad_get_range (GstPad *pad, guint64 offset, guint size,
GstBuffer **buffer);
gboolean gst_pad_send_event (GstPad *pad, GstEvent *event);
/* pad tasks */
gboolean gst_pad_start_task (GstPad *pad, GstTaskFunction func,
gpointer user_data, GDestroyNotify notify);
gboolean gst_pad_pause_task (GstPad *pad);
gboolean gst_pad_stop_task (GstPad *pad);
/* internal links */
void gst_pad_set_iterate_internal_links_function_full (GstPad * pad,
GstPadIterIntLinkFunction iterintlink,
gpointer user_data,
GDestroyNotify notify);
GstIterator * gst_pad_iterate_internal_links (GstPad * pad);
GstIterator * gst_pad_iterate_internal_links_default (GstPad * pad, GstObject *parent);
#define gst_pad_set_iterate_internal_links_function(p,f) gst_pad_set_iterate_internal_links_function_full((p),(f),NULL,NULL)
/* generic query function */
gboolean gst_pad_query (GstPad *pad, GstQuery *query);
gboolean gst_pad_peer_query (GstPad *pad, GstQuery *query);
void gst_pad_set_query_function_full (GstPad *pad, GstPadQueryFunction query,
gpointer user_data,
GDestroyNotify notify);
gboolean gst_pad_query_default (GstPad *pad, GstObject *parent,
GstQuery *query);
#define gst_pad_set_query_function(p,f) gst_pad_set_query_function_full((p),(f),NULL,NULL)
/* misc helper functions */
gboolean gst_pad_forward (GstPad *pad, GstPadForwardFunction forward,
gpointer user_data);
const gchar * gst_pad_mode_get_name (GstPadMode mode);
G_END_DECLS
#endif /* __GST_PAD_H__ */
|