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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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7774aae713
gst_pad_iterate_internal_links is usually used to find a single internal link that a pad has, e.g. to find the corresponding pad of a multiqueue. Added a helper function that will return either a single internal link, if there's no other, or NULL.
1573 lines
57 KiB
C
1573 lines
57 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wim.taymans@chello.be>
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*
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* gstpad.h: Header for GstPad object
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __GST_PAD_H__
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#define __GST_PAD_H__
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#include <gst/gstconfig.h>
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typedef struct _GstPad GstPad;
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typedef struct _GstPadPrivate GstPadPrivate;
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typedef struct _GstPadClass GstPadClass;
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typedef struct _GstPadProbeInfo GstPadProbeInfo;
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/**
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* GstPadDirection:
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* @GST_PAD_UNKNOWN: direction is unknown.
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* @GST_PAD_SRC: the pad is a source pad.
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* @GST_PAD_SINK: the pad is a sink pad.
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*
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* The direction of a pad.
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*/
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typedef enum {
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GST_PAD_UNKNOWN,
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GST_PAD_SRC,
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GST_PAD_SINK
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} GstPadDirection;
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/**
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* GstPadMode:
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* @GST_PAD_MODE_NONE: Pad will not handle dataflow
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* @GST_PAD_MODE_PUSH: Pad handles dataflow in downstream push mode
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* @GST_PAD_MODE_PULL: Pad handles dataflow in upstream pull mode
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*
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* The status of a GstPad. After activating a pad, which usually happens when the
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* parent element goes from READY to PAUSED, the GstPadMode defines if the
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* pad operates in push or pull mode.
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*/
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typedef enum {
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GST_PAD_MODE_NONE,
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GST_PAD_MODE_PUSH,
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GST_PAD_MODE_PULL
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} GstPadMode;
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#include <glib.h>
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GST_API
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const gchar * gst_pad_mode_get_name (GstPadMode mode);
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#include <gst/gstobject.h>
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#include <gst/gstbuffer.h>
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#include <gst/gstbufferlist.h>
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#include <gst/gstcaps.h>
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#include <gst/gstpadtemplate.h>
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#include <gst/gstevent.h>
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#include <gst/gstquery.h>
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#include <gst/gsttask.h>
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G_BEGIN_DECLS
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/*
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* Pad base class
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*/
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#define GST_TYPE_PAD (gst_pad_get_type ())
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#define GST_IS_PAD(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_PAD))
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#define GST_IS_PAD_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_PAD))
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#define GST_PAD(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_PAD, GstPad))
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#define GST_PAD_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_PAD, GstPadClass))
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#define GST_PAD_CAST(obj) ((GstPad*)(obj))
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/**
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* GstPadLinkReturn:
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* @GST_PAD_LINK_OK : link succeeded
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* @GST_PAD_LINK_WRONG_HIERARCHY: pads have no common grandparent
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* @GST_PAD_LINK_WAS_LINKED : pad was already linked
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* @GST_PAD_LINK_WRONG_DIRECTION: pads have wrong direction
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* @GST_PAD_LINK_NOFORMAT : pads do not have common format
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* @GST_PAD_LINK_NOSCHED : pads cannot cooperate in scheduling
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* @GST_PAD_LINK_REFUSED : refused for some reason
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*
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* Result values from gst_pad_link and friends.
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*/
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typedef enum {
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GST_PAD_LINK_OK = 0,
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GST_PAD_LINK_WRONG_HIERARCHY = -1,
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GST_PAD_LINK_WAS_LINKED = -2,
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GST_PAD_LINK_WRONG_DIRECTION = -3,
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GST_PAD_LINK_NOFORMAT = -4,
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GST_PAD_LINK_NOSCHED = -5,
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GST_PAD_LINK_REFUSED = -6
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} GstPadLinkReturn;
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/**
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* GST_PAD_LINK_FAILED:
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* @ret: the #GstPadLinkReturn value
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*
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* Macro to test if the given #GstPadLinkReturn value indicates a failed
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* link step.
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*/
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#define GST_PAD_LINK_FAILED(ret) ((ret) < GST_PAD_LINK_OK)
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/**
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* GST_PAD_LINK_SUCCESSFUL:
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* @ret: the #GstPadLinkReturn value
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*
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* Macro to test if the given #GstPadLinkReturn value indicates a successful
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* link step.
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*/
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#define GST_PAD_LINK_SUCCESSFUL(ret) ((ret) >= GST_PAD_LINK_OK)
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/**
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* GstFlowReturn:
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* @GST_FLOW_OK: Data passing was ok.
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* @GST_FLOW_NOT_LINKED: Pad is not linked.
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* @GST_FLOW_FLUSHING: Pad is flushing.
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* @GST_FLOW_EOS: Pad is EOS.
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* @GST_FLOW_NOT_NEGOTIATED: Pad is not negotiated.
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* @GST_FLOW_ERROR: Some (fatal) error occurred. Element generating
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* this error should post an error message with more
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* details.
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* @GST_FLOW_NOT_SUPPORTED: This operation is not supported.
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* @GST_FLOW_CUSTOM_SUCCESS: Elements can use values starting from
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* this (and higher) to define custom success
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* codes.
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* @GST_FLOW_CUSTOM_SUCCESS_1: Pre-defined custom success code (define your
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* custom success code to this to avoid compiler
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* warnings).
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* @GST_FLOW_CUSTOM_SUCCESS_2: Pre-defined custom success code.
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* @GST_FLOW_CUSTOM_ERROR: Elements can use values starting from
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* this (and lower) to define custom error codes.
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* @GST_FLOW_CUSTOM_ERROR_1: Pre-defined custom error code (define your
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* custom error code to this to avoid compiler
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* warnings).
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* @GST_FLOW_CUSTOM_ERROR_2: Pre-defined custom error code.
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*
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* The result of passing data to a pad.
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*
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* Note that the custom return values should not be exposed outside of the
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* element scope.
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*/
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typedef enum {
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/* custom success starts here */
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GST_FLOW_CUSTOM_SUCCESS_2 = 102,
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GST_FLOW_CUSTOM_SUCCESS_1 = 101,
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GST_FLOW_CUSTOM_SUCCESS = 100,
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/* core predefined */
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GST_FLOW_OK = 0,
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/* expected failures */
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GST_FLOW_NOT_LINKED = -1,
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GST_FLOW_FLUSHING = -2,
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/* error cases */
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GST_FLOW_EOS = -3,
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GST_FLOW_NOT_NEGOTIATED = -4,
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GST_FLOW_ERROR = -5,
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GST_FLOW_NOT_SUPPORTED = -6,
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/* custom error starts here */
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GST_FLOW_CUSTOM_ERROR = -100,
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GST_FLOW_CUSTOM_ERROR_1 = -101,
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GST_FLOW_CUSTOM_ERROR_2 = -102
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} GstFlowReturn;
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GST_API
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const gchar * gst_flow_get_name (GstFlowReturn ret);
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GST_API
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GQuark gst_flow_to_quark (GstFlowReturn ret);
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GST_API
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const gchar * gst_pad_link_get_name (GstPadLinkReturn ret);
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/**
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* GstPadLinkCheck:
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* @GST_PAD_LINK_CHECK_NOTHING: Don't check hierarchy or caps compatibility.
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* @GST_PAD_LINK_CHECK_HIERARCHY: Check the pads have same parents/grandparents.
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* Could be omitted if it is already known that the two elements that own the
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* pads are in the same bin.
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* @GST_PAD_LINK_CHECK_TEMPLATE_CAPS: Check if the pads are compatible by using
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* their template caps. This is much faster than @GST_PAD_LINK_CHECK_CAPS, but
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* would be unsafe e.g. if one pad has %GST_CAPS_ANY.
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* @GST_PAD_LINK_CHECK_CAPS: Check if the pads are compatible by comparing the
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* caps returned by gst_pad_query_caps().
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* @GST_PAD_LINK_CHECK_NO_RECONFIGURE: Disables pushing a reconfigure event when pads are
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* linked.
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* @GST_PAD_LINK_CHECK_DEFAULT: The default checks done when linking
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* pads (i.e. the ones used by gst_pad_link()).
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*
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* The amount of checking to be done when linking pads. @GST_PAD_LINK_CHECK_CAPS
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* and @GST_PAD_LINK_CHECK_TEMPLATE_CAPS are mutually exclusive. If both are
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* specified, expensive but safe @GST_PAD_LINK_CHECK_CAPS are performed.
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*
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* > Only disable some of the checks if you are 100% certain you know the link
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* > will not fail because of hierarchy/caps compatibility failures. If uncertain,
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* > use the default checks (%GST_PAD_LINK_CHECK_DEFAULT) or the regular methods
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* > for linking the pads.
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*/
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typedef enum {
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GST_PAD_LINK_CHECK_NOTHING = 0,
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GST_PAD_LINK_CHECK_HIERARCHY = 1 << 0,
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GST_PAD_LINK_CHECK_TEMPLATE_CAPS = 1 << 1,
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GST_PAD_LINK_CHECK_CAPS = 1 << 2,
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/* Not really checks, more like flags
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* Added here to avoid creating a new gst_pad_link_variant */
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GST_PAD_LINK_CHECK_NO_RECONFIGURE = 1 << 3,
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GST_PAD_LINK_CHECK_DEFAULT = GST_PAD_LINK_CHECK_HIERARCHY | GST_PAD_LINK_CHECK_CAPS
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} GstPadLinkCheck;
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/* pad states */
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/**
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* GstPadActivateFunction:
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* @pad: a #GstPad
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* @parent: the parent of @pad
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*
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* This function is called when the pad is activated during the element
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* READY to PAUSED state change. By default this function will call the
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* activate function that puts the pad in push mode but elements can
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* override this function to activate the pad in pull mode if they wish.
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*
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* Returns: %TRUE if the pad could be activated.
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*/
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typedef gboolean (*GstPadActivateFunction) (GstPad *pad, GstObject *parent);
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/**
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* GstPadActivateModeFunction:
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* @pad: a #GstPad
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* @parent: the parent of @pad
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* @mode: the requested activation mode of @pad
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* @active: activate or deactivate the pad.
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*
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* The prototype of the push and pull activate functions.
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*
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* Returns: %TRUE if the pad could be activated or deactivated.
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*/
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typedef gboolean (*GstPadActivateModeFunction) (GstPad *pad, GstObject *parent,
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GstPadMode mode, gboolean active);
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/* data passing */
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/**
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* GstPadChainFunction:
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* @pad: the sink #GstPad that performed the chain.
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* @parent: (allow-none): the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT
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* flag is set, @parent is guaranteed to be not-%NULL and remain valid
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* during the execution of this function.
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* @buffer: (transfer full): the #GstBuffer that is chained, not %NULL.
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*
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* A function that will be called on sinkpads when chaining buffers.
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* The function typically processes the data contained in the buffer and
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* either consumes the data or passes it on to the internally linked pad(s).
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*
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* The implementer of this function receives a refcount to @buffer and should
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* gst_buffer_unref() when the buffer is no longer needed.
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*
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* When a chain function detects an error in the data stream, it must post an
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* error on the bus and return an appropriate #GstFlowReturn value.
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*
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* Returns: #GST_FLOW_OK for success
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*/
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typedef GstFlowReturn (*GstPadChainFunction) (GstPad *pad, GstObject *parent,
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GstBuffer *buffer);
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/**
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* GstPadChainListFunction:
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* @pad: the sink #GstPad that performed the chain.
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* @parent: (allow-none): the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT
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* flag is set, @parent is guaranteed to be not-%NULL and remain valid
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* during the execution of this function.
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* @list: (transfer full): the #GstBufferList that is chained, not %NULL.
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*
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* A function that will be called on sinkpads when chaining buffer lists.
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* The function typically processes the data contained in the buffer list and
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* either consumes the data or passes it on to the internally linked pad(s).
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*
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* The implementer of this function receives a refcount to @list and
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* should gst_buffer_list_unref() when the list is no longer needed.
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*
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* When a chainlist function detects an error in the data stream, it must
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* post an error on the bus and return an appropriate #GstFlowReturn value.
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*
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* Returns: #GST_FLOW_OK for success
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*/
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typedef GstFlowReturn (*GstPadChainListFunction) (GstPad *pad, GstObject *parent,
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GstBufferList *list);
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/**
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* GstPadGetRangeFunction:
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* @pad: the src #GstPad to perform the getrange on.
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* @parent: (allow-none): the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT
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* flag is set, @parent is guaranteed to be not-%NULL and remain valid
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* during the execution of this function.
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* @offset: the offset of the range
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* @length: the length of the range
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* @buffer: a memory location to hold the result buffer, cannot be %NULL.
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*
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* This function will be called on source pads when a peer element
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* request a buffer at the specified @offset and @length. If this function
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* returns #GST_FLOW_OK, the result buffer will be stored in @buffer. The
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* contents of @buffer is invalid for any other return value.
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*
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* This function is installed on a source pad with
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* gst_pad_set_getrange_function() and can only be called on source pads after
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* they are successfully activated with gst_pad_activate_mode() with the
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* #GST_PAD_MODE_PULL.
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*
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* @offset and @length are always given in byte units. @offset must normally be a value
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* between 0 and the length in bytes of the data available on @pad. The
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* length (duration in bytes) can be retrieved with a #GST_QUERY_DURATION or with a
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* #GST_QUERY_SEEKING.
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*
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* Any @offset larger or equal than the length will make the function return
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* #GST_FLOW_EOS, which corresponds to EOS. In this case @buffer does not
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* contain a valid buffer.
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*
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* The buffer size of @buffer will only be smaller than @length when @offset is
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* near the end of the stream. In all other cases, the size of @buffer must be
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* exactly the requested size.
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*
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* It is allowed to call this function with a 0 @length and valid @offset, in
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* which case @buffer will contain a 0-sized buffer and the function returns
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* #GST_FLOW_OK.
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*
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* When this function is called with a -1 @offset, the sequentially next buffer
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* of length @length in the stream is returned.
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*
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* When this function is called with a -1 @length, a buffer with a default
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* optimal length is returned in @buffer. The length might depend on the value
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* of @offset.
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*
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* Returns: #GST_FLOW_OK for success and a valid buffer in @buffer. Any other
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* return value leaves @buffer undefined.
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*/
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typedef GstFlowReturn (*GstPadGetRangeFunction) (GstPad *pad, GstObject *parent,
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guint64 offset, guint length,
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GstBuffer **buffer);
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/**
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* GstPadEventFunction:
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* @pad: the #GstPad to handle the event.
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* @parent: (allow-none): the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT
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* flag is set, @parent is guaranteed to be not-%NULL and remain valid
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* during the execution of this function.
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* @event: (transfer full): the #GstEvent to handle.
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*
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* Function signature to handle an event for the pad.
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*
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* Returns: %TRUE if the pad could handle the event.
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*/
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typedef gboolean (*GstPadEventFunction) (GstPad *pad, GstObject *parent,
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GstEvent *event);
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/**
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* GstPadEventFullFunction:
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* @pad: the #GstPad to handle the event.
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* @parent: (allow-none): the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT
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* flag is set, @parent is guaranteed to be not-%NULL and remain valid
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* during the execution of this function.
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* @event: (transfer full): the #GstEvent to handle.
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*
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* Function signature to handle an event for the pad.
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*
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* This variant is for specific elements that will take into account the
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* last downstream flow return (from a pad push), in which case they can
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* return it.
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*
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* Returns: %GST_FLOW_OK if the event was handled properly, or any other
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* #GstFlowReturn dependent on downstream state.
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*
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* Since: 1.8
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*/
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typedef GstFlowReturn (*GstPadEventFullFunction) (GstPad *pad, GstObject *parent,
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GstEvent *event);
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/* internal links */
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/**
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* GstPadIterIntLinkFunction:
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* @pad: The #GstPad to query.
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* @parent: (allow-none): the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT
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* flag is set, @parent is guaranteed to be not-%NULL and remain valid
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* during the execution of this function.
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*
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* The signature of the internal pad link iterator function.
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*
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* Returns: a new #GstIterator that will iterate over all pads that are
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* linked to the given pad on the inside of the parent element.
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*
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* the caller must call gst_iterator_free() after usage.
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*/
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typedef GstIterator* (*GstPadIterIntLinkFunction) (GstPad *pad, GstObject *parent);
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/* generic query function */
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/**
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* GstPadQueryFunction:
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* @pad: the #GstPad to query.
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* @parent: (allow-none): the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT
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* flag is set, @parent is guaranteed to be not-%NULL and remain valid
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* during the execution of this function.
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* @query: the #GstQuery object to execute
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*
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* The signature of the query function.
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*
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* Returns: %TRUE if the query could be performed.
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*/
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typedef gboolean (*GstPadQueryFunction) (GstPad *pad, GstObject *parent,
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GstQuery *query);
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/* linking */
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/**
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* GstPadLinkFunction:
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* @pad: the #GstPad that is linked.
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* @parent: (allow-none): the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT
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* flag is set, @parent is guaranteed to be not-%NULL and remain valid
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* during the execution of this function.
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* @peer: the peer #GstPad of the link
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*
|
|
* 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: (allow-none): 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.
|
|
*
|
|
* The pad's lock is already held when the unlink function is called, so most
|
|
* pad functions cannot be called from within the callback.
|
|
*/
|
|
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 while the callback is called
|
|
* @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. This leaves the probe in
|
|
* place, and defers decisions about dropping or passing data to other
|
|
* probes, if any. If there are no other probes, the default behaviour
|
|
* for the probe type applies ('block' for blocking probes,
|
|
* and 'pass' for non-blocking probes).
|
|
* @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, no other probes
|
|
* are called for this item and %GST_FLOW_OK or %TRUE is returned to the
|
|
* caller.
|
|
* @GST_PAD_PROBE_REMOVE: remove this probe.
|
|
* @GST_PAD_PROBE_PASS: pass the data item in the block probe and block on the
|
|
* next item.
|
|
* @GST_PAD_PROBE_HANDLED: Data has been handled in the probe and will not be
|
|
* forwarded further. For events and buffers this is the same behaviour as
|
|
* %GST_PAD_PROBE_DROP (except that in this case you need to unref the buffer
|
|
* or event yourself). For queries it will also return %TRUE to the caller.
|
|
* The probe can also modify the #GstFlowReturn value by using the
|
|
* #GST_PAD_PROBE_INFO_FLOW_RETURN() accessor.
|
|
* Note that the resulting query must contain valid entries.
|
|
* Since: 1.6
|
|
*
|
|
* Different return values for the #GstPadProbeCallback.
|
|
*/
|
|
typedef enum
|
|
{
|
|
GST_PAD_PROBE_DROP,
|
|
GST_PAD_PROBE_OK,
|
|
GST_PAD_PROBE_REMOVE,
|
|
GST_PAD_PROBE_PASS,
|
|
GST_PAD_PROBE_HANDLED
|
|
} GstPadProbeReturn;
|
|
|
|
|
|
/**
|
|
* GstPadProbeInfo:
|
|
* @type: the current probe type
|
|
* @id: the id of the probe
|
|
* @data: (allow-none): 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 >*/
|
|
union {
|
|
gpointer _gst_reserved[GST_PADDING];
|
|
struct {
|
|
GstFlowReturn flow_ret;
|
|
} abi;
|
|
} ABI;
|
|
};
|
|
|
|
#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_FLOW_RETURN(d) ((d)->ABI.abi.flow_ret)
|
|
|
|
#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)
|
|
|
|
GST_API
|
|
GstEvent* gst_pad_probe_info_get_event (GstPadProbeInfo * info);
|
|
|
|
GST_API
|
|
GstQuery* gst_pad_probe_info_get_query (GstPadProbeInfo * info);
|
|
|
|
GST_API
|
|
GstBuffer* gst_pad_probe_info_get_buffer (GstPadProbeInfo * info);
|
|
|
|
GST_API
|
|
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: (allow-none): 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 default caps query function
|
|
* will only return 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_ACCEPT_INTERSECT: the default accept-caps handler will check
|
|
* it the caps intersect the query-caps result instead
|
|
* of checking for a subset. This is interesting for
|
|
* parsers that can accept incompletely specified caps.
|
|
* @GST_PAD_FLAG_ACCEPT_TEMPLATE: the default accept-caps handler will use
|
|
* the template pad caps instead of query caps to
|
|
* compare with the accept caps. Use this in combination
|
|
* with %GST_PAD_FLAG_ACCEPT_INTERSECT. (Since: 1.6)
|
|
* @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),
|
|
GST_PAD_FLAG_ACCEPT_INTERSECT = (GST_OBJECT_FLAG_LAST << 11),
|
|
GST_PAD_FLAG_ACCEPT_TEMPLATE = (GST_OBJECT_FLAG_LAST << 12),
|
|
/* 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;
|
|
|
|
union {
|
|
gpointer _gst_reserved[GST_PADDING];
|
|
struct {
|
|
GstFlowReturn last_flowret;
|
|
GstPadEventFullFunction eventfullfunc;
|
|
} abi;
|
|
} ABI;
|
|
};
|
|
|
|
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 */
|
|
|
|
/**
|
|
* GST_PAD_NAME:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Get name of the given pad.
|
|
* No locking is performed in this function, use gst_pad_get_name() instead.
|
|
*/
|
|
#define GST_PAD_NAME(pad) (GST_OBJECT_NAME(pad))
|
|
/**
|
|
* GST_PAD_PARENT:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Get the @pad parent.
|
|
* No locking is performed in this function, use gst_pad_get_parent() instead.
|
|
*/
|
|
#define GST_PAD_PARENT(pad) (GST_ELEMENT_CAST(GST_OBJECT_PARENT(pad)))
|
|
/**
|
|
* GST_PAD_ELEMENT_PRIVATE:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Get the private data of @pad, which is usually some pad- or stream-specific
|
|
* structure created by the element and set on the pad when creating it.
|
|
* No locking is performed in this function.
|
|
*/
|
|
#define GST_PAD_ELEMENT_PRIVATE(pad) (GST_PAD_CAST(pad)->element_private)
|
|
/**
|
|
* GST_PAD_PAD_TEMPLATE:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Get the @pad #GstPadTemplate. It describes the possible media types
|
|
* a @pad or an element factory can handle.
|
|
*/
|
|
#define GST_PAD_PAD_TEMPLATE(pad) (GST_PAD_CAST(pad)->padtemplate)
|
|
/**
|
|
* GST_PAD_DIRECTION:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Get the #GstPadDirection of the given @pad. Accessor macro, use
|
|
* gst_pad_get_direction() instead.
|
|
*/
|
|
#define GST_PAD_DIRECTION(pad) (GST_PAD_CAST(pad)->direction)
|
|
/**
|
|
* GST_PAD_TASK:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Get the #GstTask of @pad. Accessor macro used by GStreamer. Use the
|
|
* gst_pad_start_task(), gst_pad_stop_task() and gst_pad_pause_task()
|
|
* functions instead.
|
|
*/
|
|
#define GST_PAD_TASK(pad) (GST_PAD_CAST(pad)->task)
|
|
/**
|
|
* GST_PAD_MODE:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Get the #GstPadMode of pad, which will be GST_PAD_MODE_NONE if the pad
|
|
* has not been activated yet, and otherwise either GST_PAD_MODE_PUSH or
|
|
* GST_PAD_MODE_PULL depending on which mode the pad was activated in.
|
|
*/
|
|
#define GST_PAD_MODE(pad) (GST_PAD_CAST(pad)->mode)
|
|
/**
|
|
* GST_PAD_ACTIVATEFUNC:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Get the #GstPadActivateFunction from @pad.
|
|
*/
|
|
#define GST_PAD_ACTIVATEFUNC(pad) (GST_PAD_CAST(pad)->activatefunc)
|
|
/**
|
|
* GST_PAD_ACTIVATEMODEFUNC:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Get the #GstPadActivateModeFunction from the given @pad.
|
|
*/
|
|
#define GST_PAD_ACTIVATEMODEFUNC(pad) (GST_PAD_CAST(pad)->activatemodefunc)
|
|
/**
|
|
* GST_PAD_CHAINFUNC:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Get the #GstPadChainFunction from the given @pad.
|
|
*/
|
|
#define GST_PAD_CHAINFUNC(pad) (GST_PAD_CAST(pad)->chainfunc)
|
|
/**
|
|
* GST_PAD_CHAINLISTFUNC:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Get the #GstPadChainListFunction from the given @pad.
|
|
*/
|
|
#define GST_PAD_CHAINLISTFUNC(pad) (GST_PAD_CAST(pad)->chainlistfunc)
|
|
/**
|
|
* GST_PAD_GETRANGEFUNC:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Get the #GstPadGetRangeFunction from the given @pad.
|
|
*/
|
|
#define GST_PAD_GETRANGEFUNC(pad) (GST_PAD_CAST(pad)->getrangefunc)
|
|
/**
|
|
* GST_PAD_EVENTFUNC:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Get the #GstPadEventFunction from the given @pad, which
|
|
* is the function that handles events on the pad. You can
|
|
* use this to set your own event handling function on a pad
|
|
* after you create it. If your element derives from a base
|
|
* class, use the base class's virtual functions instead.
|
|
*/
|
|
#define GST_PAD_EVENTFUNC(pad) (GST_PAD_CAST(pad)->eventfunc)
|
|
/**
|
|
* GST_PAD_EVENTFULLFUNC:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Get the #GstPadEventFullFunction from the given @pad, which
|
|
* is the function that handles events on the pad. You can
|
|
* use this to set your own event handling function on a pad
|
|
* after you create it. If your element derives from a base
|
|
* class, use the base class's virtual functions instead.
|
|
*
|
|
* Since: 1.8
|
|
*/
|
|
#define GST_PAD_EVENTFULLFUNC(pad) (GST_PAD_CAST(pad)->ABI.abi.eventfullfunc)
|
|
/**
|
|
* GST_PAD_QUERYFUNC:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Get the #GstPadQueryFunction from @pad, which is the function
|
|
* that handles queries on the pad. You can use this to set your
|
|
* own query handling function on a pad after you create it. If your
|
|
* element derives from a base class, use the base class's virtual
|
|
* functions instead.
|
|
*/
|
|
#define GST_PAD_QUERYFUNC(pad) (GST_PAD_CAST(pad)->queryfunc)
|
|
/**
|
|
* GST_PAD_ITERINTLINKFUNC:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Get the #GstPadIterIntLinkFunction from the given @pad.
|
|
*/
|
|
#define GST_PAD_ITERINTLINKFUNC(pad) (GST_PAD_CAST(pad)->iterintlinkfunc)
|
|
/**
|
|
* GST_PAD_PEER:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Return the pad's peer member. This member is a pointer to the linked @pad.
|
|
* No locking is performed in this function, use gst_pad_get_peer() instead.
|
|
*/
|
|
#define GST_PAD_PEER(pad) (GST_PAD_CAST(pad)->peer)
|
|
/**
|
|
* GST_PAD_LINKFUNC:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Get the #GstPadLinkFunction for the given @pad.
|
|
*/
|
|
#define GST_PAD_LINKFUNC(pad) (GST_PAD_CAST(pad)->linkfunc)
|
|
/**
|
|
* GST_PAD_UNLINKFUNC:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Get the #GstPadUnlinkFunction from the given @pad.
|
|
*/
|
|
#define GST_PAD_UNLINKFUNC(pad) (GST_PAD_CAST(pad)->unlinkfunc)
|
|
/**
|
|
* GST_PAD_IS_SRC:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Returns: %TRUE if the pad is a source pad (i.e. produces data).
|
|
*/
|
|
#define GST_PAD_IS_SRC(pad) (GST_PAD_DIRECTION(pad) == GST_PAD_SRC)
|
|
/**
|
|
* GST_PAD_IS_SINK:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Returns: %TRUE if the pad is a sink pad (i.e. consumes data).
|
|
*/
|
|
#define GST_PAD_IS_SINK(pad) (GST_PAD_DIRECTION(pad) == GST_PAD_SINK)
|
|
/**
|
|
* GST_PAD_IS_LINKED:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Returns: %TRUE if the pad is linked to another pad. Use gst_pad_is_linked()
|
|
* instead.
|
|
*/
|
|
#define GST_PAD_IS_LINKED(pad) (GST_PAD_PEER(pad) != NULL)
|
|
/**
|
|
* GST_PAD_IS_ACTIVE:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Returns: %TRUE if the pad has been activated.
|
|
*/
|
|
#define GST_PAD_IS_ACTIVE(pad) (GST_PAD_MODE(pad) != GST_PAD_MODE_NONE)
|
|
/**
|
|
* GST_PAD_IS_BLOCKED:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Check if the dataflow on a @pad is blocked. Use gst_pad_is_blocked() instead.
|
|
*/
|
|
#define GST_PAD_IS_BLOCKED(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_BLOCKED))
|
|
/**
|
|
* GST_PAD_IS_BLOCKING:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Check if the @pad is currently blocking on a buffer or event. Use
|
|
* gst_pad_is_blocking() instead.
|
|
*/
|
|
#define GST_PAD_IS_BLOCKING(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_BLOCKING))
|
|
/**
|
|
* GST_PAD_IS_FLUSHING:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Check if the given @pad is flushing.
|
|
*/
|
|
#define GST_PAD_IS_FLUSHING(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_FLUSHING))
|
|
/**
|
|
* GST_PAD_SET_FLUSHING:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Set the given @pad to flushing state, which means it will not accept any
|
|
* more events, queries or buffers, and return GST_FLOW_FLUSHING if any buffers
|
|
* are pushed on it. This usually happens when the pad is shut down or when
|
|
* a flushing seek happens. This is used inside GStreamer when flush start/stop
|
|
* events pass through pads, or when an element state is changed and pads are
|
|
* activated or deactivated.
|
|
*/
|
|
#define GST_PAD_SET_FLUSHING(pad) (GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_FLUSHING))
|
|
/**
|
|
* GST_PAD_UNSET_FLUSHING:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Unset the flushing flag.
|
|
*/
|
|
#define GST_PAD_UNSET_FLUSHING(pad) (GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_FLUSHING))
|
|
/**
|
|
* GST_PAD_IS_EOS:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Check if the @pad is in EOS state.
|
|
*/
|
|
#define GST_PAD_IS_EOS(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_EOS))
|
|
/**
|
|
* GST_PAD_NEEDS_RECONFIGURE:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Check if the @pad should be reconfigured/renegotiated.
|
|
* The flag has to be unset manually after reconfiguration happened.
|
|
* Use gst_pad_needs_reconfigure() or gst_pad_check_reconfigure() instead.
|
|
*/
|
|
#define GST_PAD_NEEDS_RECONFIGURE(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_NEED_RECONFIGURE))
|
|
/**
|
|
* GST_PAD_HAS_PENDING_EVENTS:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Check if the given @pad has pending events. This is used internally by
|
|
* GStreamer.
|
|
*/
|
|
#define GST_PAD_HAS_PENDING_EVENTS(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_PENDING_EVENTS))
|
|
/**
|
|
* GST_PAD_IS_FIXED_CAPS:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Check if the given @pad is using fixed caps, which means that
|
|
* once the caps are set on the @pad, the caps query function will
|
|
* only return those caps. See gst_pad_use_fixed_caps().
|
|
*/
|
|
#define GST_PAD_IS_FIXED_CAPS(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_FIXED_CAPS))
|
|
/**
|
|
* GST_PAD_NEEDS_PARENT:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Check if there is a parent object before calling into the @pad callbacks.
|
|
* This is used internally by GStreamer.
|
|
*/
|
|
#define GST_PAD_NEEDS_PARENT(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_NEED_PARENT))
|
|
/**
|
|
* GST_PAD_IS_PROXY_CAPS:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Check if the given @pad is set to proxy caps. This means that the default
|
|
* event and query handler will forward all events and queries to the
|
|
* internally linked @pads instead of discarding them.
|
|
*/
|
|
#define GST_PAD_IS_PROXY_CAPS(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_PROXY_CAPS))
|
|
/**
|
|
* GST_PAD_SET_PROXY_CAPS:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Set @pad to proxy caps, so that all caps-related events and queries are
|
|
* proxied down- or upstream to the other side of the element automatically.
|
|
* Set this if the element always outputs data in the exact same format as it
|
|
* receives as input. This is just for convenience to avoid implementing some
|
|
* standard event and query handling code in an element.
|
|
*/
|
|
#define GST_PAD_SET_PROXY_CAPS(pad) (GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_PROXY_CAPS))
|
|
/**
|
|
* GST_PAD_UNSET_PROXY_CAPS:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Unset proxy caps flag.
|
|
*/
|
|
#define GST_PAD_UNSET_PROXY_CAPS(pad) (GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_PROXY_CAPS))
|
|
/**
|
|
* GST_PAD_IS_PROXY_ALLOCATION:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Check if the given @pad is set as proxy allocation which means
|
|
* that the default query handler will forward allocation queries to the
|
|
* internally linked @pads instead of discarding them.
|
|
*/
|
|
#define GST_PAD_IS_PROXY_ALLOCATION(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_PROXY_ALLOCATION))
|
|
/**
|
|
* GST_PAD_SET_PROXY_ALLOCATION:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Set @pad to proxy allocation queries, which means that the default query
|
|
* handler will forward allocation queries to the internally linked @pads
|
|
* instead of discarding them.
|
|
* Set this if the element always outputs data in the exact same format as it
|
|
* receives as input. This is just for convenience to avoid implementing some
|
|
* standard query handling code in an element.
|
|
*/
|
|
#define GST_PAD_SET_PROXY_ALLOCATION(pad) (GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_PROXY_ALLOCATION))
|
|
/**
|
|
* GST_PAD_UNSET_PROXY_ALLOCATION:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Unset proxy allocation flag.
|
|
*/
|
|
#define GST_PAD_UNSET_PROXY_ALLOCATION(pad) (GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_PROXY_ALLOCATION))
|
|
/**
|
|
* GST_PAD_IS_PROXY_SCHEDULING:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Check if the given @pad is set to proxy scheduling queries, which means that
|
|
* the default query handler will forward scheduling queries to the internally
|
|
* linked @pads instead of discarding them.
|
|
*/
|
|
#define GST_PAD_IS_PROXY_SCHEDULING(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_PROXY_SCHEDULING))
|
|
/**
|
|
* GST_PAD_SET_PROXY_SCHEDULING:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Set @pad to proxy scheduling queries, which means that the default query
|
|
* handler will forward scheduling queries to the internally linked @pads
|
|
* instead of discarding them. You will usually want to handle scheduling
|
|
* queries explicitly if your element supports multiple scheduling modes.
|
|
*/
|
|
#define GST_PAD_SET_PROXY_SCHEDULING(pad) (GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_PROXY_SCHEDULING))
|
|
/**
|
|
* GST_PAD_UNSET_PROXY_SCHEDULING:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Unset proxy scheduling flag.
|
|
*/
|
|
#define GST_PAD_UNSET_PROXY_SCHEDULING(pad) (GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_PROXY_SCHEDULING))
|
|
/**
|
|
* GST_PAD_IS_ACCEPT_INTERSECT:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Check if the pad's accept intersect flag is set. The default accept-caps
|
|
* handler will check if the caps intersect the query-caps result instead of
|
|
* checking for a subset. This is interesting for parser elements that can
|
|
* accept incompletely specified caps.
|
|
*/
|
|
#define GST_PAD_IS_ACCEPT_INTERSECT(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_ACCEPT_INTERSECT))
|
|
/**
|
|
* GST_PAD_SET_ACCEPT_INTERSECT:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Set @pad to by default accept caps by intersecting the result instead of
|
|
* checking for a subset. This is interesting for parser elements that can
|
|
* accept incompletely specified caps.
|
|
*/
|
|
#define GST_PAD_SET_ACCEPT_INTERSECT(pad) (GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_ACCEPT_INTERSECT))
|
|
/**
|
|
* GST_PAD_UNSET_ACCEPT_INTERSECT:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Unset accept intersect flag.
|
|
*/
|
|
#define GST_PAD_UNSET_ACCEPT_INTERSECT(pad) (GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_ACCEPT_INTERSECT))
|
|
/**
|
|
* GST_PAD_IS_ACCEPT_TEMPLATE:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Check if the pad's accept caps operation will use the pad template caps.
|
|
* The default accept-caps will do a query caps to get the caps, which might
|
|
* be querying downstream causing unnecessary overhead. It is recommended to
|
|
* implement a proper accept-caps query handler or to use this flag to prevent
|
|
* recursive accept-caps handling.
|
|
*
|
|
* Since: 1.6
|
|
*/
|
|
#define GST_PAD_IS_ACCEPT_TEMPLATE(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_ACCEPT_TEMPLATE))
|
|
/**
|
|
* GST_PAD_SET_ACCEPT_TEMPLATE:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Set @pad to by default use the pad template caps to compare with
|
|
* the accept caps instead of using a caps query result.
|
|
*
|
|
* Since: 1.6
|
|
*/
|
|
#define GST_PAD_SET_ACCEPT_TEMPLATE(pad) (GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_ACCEPT_TEMPLATE))
|
|
/**
|
|
* GST_PAD_UNSET_ACCEPT_TEMPLATE:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Unset accept template flag.
|
|
*
|
|
* Since: 1.6
|
|
*/
|
|
#define GST_PAD_UNSET_ACCEPT_TEMPLATE(pad) (GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_ACCEPT_TEMPLATE))
|
|
/**
|
|
* 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. Accessor
|
|
* macro, use GST_PAD_STREAM_LOCK() and GST_PAD_STREAM_UNLOCK() instead
|
|
* to take/release the pad's stream lock.
|
|
*/
|
|
#define GST_PAD_GET_STREAM_LOCK(pad) (&(GST_PAD_CAST(pad)->stream_rec_lock))
|
|
/**
|
|
* GST_PAD_STREAM_LOCK:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Take the pad's stream lock. The stream lock is recursive and will be taken
|
|
* when buffers or serialized downstream events are pushed on a 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 take the pad's stream lock, and return %TRUE if the lock could be
|
|
* taken, and otherwise %FALSE.
|
|
*/
|
|
#define GST_PAD_STREAM_TRYLOCK(pad) g_rec_mutex_trylock(GST_PAD_GET_STREAM_LOCK(pad))
|
|
/**
|
|
* GST_PAD_STREAM_UNLOCK:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Release the pad's stream lock.
|
|
*/
|
|
#define GST_PAD_STREAM_UNLOCK(pad) g_rec_mutex_unlock(GST_PAD_GET_STREAM_LOCK(pad))
|
|
/**
|
|
* GST_PAD_LAST_FLOW_RETURN:
|
|
* @pad: a #GstPad
|
|
*
|
|
* Gets the last flow return on this pad
|
|
*
|
|
* Since: 1.4
|
|
*/
|
|
#define GST_PAD_LAST_FLOW_RETURN(pad) (GST_PAD_CAST(pad)->ABI.abi.last_flowret)
|
|
|
|
#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)))
|
|
|
|
GST_API
|
|
GType gst_pad_get_type (void);
|
|
|
|
/* creating pads */
|
|
|
|
GST_API
|
|
GstPad* gst_pad_new (const gchar *name, GstPadDirection direction);
|
|
|
|
GST_API
|
|
GstPad* gst_pad_new_from_template (GstPadTemplate *templ, const gchar *name);
|
|
|
|
GST_API
|
|
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))
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/**
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* gst_pad_get_parent:
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* @pad: the pad to get the parent of
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*
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* Get the parent of @pad. This function increases the refcount
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* of the parent object so you should gst_object_unref() it after usage.
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* Can return %NULL if the pad did not have a parent.
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*
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* MT safe.
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*
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* Returns: (nullable): the parent
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*/
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#define gst_pad_get_parent(pad) gst_object_get_parent (GST_OBJECT_CAST (pad))
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GST_API
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GstPadDirection gst_pad_get_direction (GstPad *pad);
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GST_API
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gboolean gst_pad_set_active (GstPad *pad, gboolean active);
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GST_API
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gboolean gst_pad_is_active (GstPad *pad);
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GST_API
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gboolean gst_pad_activate_mode (GstPad *pad, GstPadMode mode,
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gboolean active);
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GST_API
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gulong gst_pad_add_probe (GstPad *pad,
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GstPadProbeType mask,
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GstPadProbeCallback callback,
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gpointer user_data,
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GDestroyNotify destroy_data);
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GST_API
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void gst_pad_remove_probe (GstPad *pad, gulong id);
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GST_API
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gboolean gst_pad_is_blocked (GstPad *pad);
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GST_API
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gboolean gst_pad_is_blocking (GstPad *pad);
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GST_API
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void gst_pad_mark_reconfigure (GstPad *pad);
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GST_API
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gboolean gst_pad_needs_reconfigure (GstPad *pad);
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GST_API
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gboolean gst_pad_check_reconfigure (GstPad *pad);
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GST_API
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void gst_pad_set_element_private (GstPad *pad, gpointer priv);
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GST_API
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gpointer gst_pad_get_element_private (GstPad *pad);
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GST_API
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GstPadTemplate* gst_pad_get_pad_template (GstPad *pad);
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GST_API
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GstFlowReturn gst_pad_store_sticky_event (GstPad *pad, GstEvent *event);
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GST_API
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GstEvent* gst_pad_get_sticky_event (GstPad *pad, GstEventType event_type,
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guint idx);
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GST_API
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void gst_pad_sticky_events_foreach (GstPad *pad, GstPadStickyEventsForeachFunction foreach_func, gpointer user_data);
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/* data passing setup functions */
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GST_API
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void gst_pad_set_activate_function_full (GstPad *pad,
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GstPadActivateFunction activate,
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gpointer user_data,
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GDestroyNotify notify);
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GST_API
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void gst_pad_set_activatemode_function_full (GstPad *pad,
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GstPadActivateModeFunction activatemode,
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gpointer user_data,
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GDestroyNotify notify);
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/* data passing functions */
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GST_API
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void gst_pad_set_chain_function_full (GstPad *pad,
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GstPadChainFunction chain,
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gpointer user_data,
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GDestroyNotify notify);
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GST_API
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void gst_pad_set_chain_list_function_full (GstPad *pad,
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GstPadChainListFunction chainlist,
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gpointer user_data,
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GDestroyNotify notify);
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GST_API
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void gst_pad_set_getrange_function_full (GstPad *pad,
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GstPadGetRangeFunction get,
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gpointer user_data,
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GDestroyNotify notify);
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GST_API
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void gst_pad_set_event_function_full (GstPad *pad,
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GstPadEventFunction event,
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gpointer user_data,
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GDestroyNotify notify);
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GST_API
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void gst_pad_set_event_full_function_full (GstPad *pad,
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GstPadEventFullFunction event,
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gpointer user_data,
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GDestroyNotify notify);
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#define gst_pad_set_activate_function(p,f) gst_pad_set_activate_function_full((p),(f),NULL,NULL)
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#define gst_pad_set_activatemode_function(p,f) gst_pad_set_activatemode_function_full((p),(f),NULL,NULL)
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#define gst_pad_set_chain_function(p,f) gst_pad_set_chain_function_full((p),(f),NULL,NULL)
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#define gst_pad_set_chain_list_function(p,f) gst_pad_set_chain_list_function_full((p),(f),NULL,NULL)
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#define gst_pad_set_getrange_function(p,f) gst_pad_set_getrange_function_full((p),(f),NULL,NULL)
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#define gst_pad_set_event_function(p,f) gst_pad_set_event_function_full((p),(f),NULL,NULL)
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#define gst_pad_set_event_full_function(p,f) gst_pad_set_event_full_function_full((p),(f),NULL,NULL)
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/* pad links */
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GST_API
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void gst_pad_set_link_function_full (GstPad *pad,
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GstPadLinkFunction link,
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gpointer user_data,
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|
GDestroyNotify notify);
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GST_API
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void gst_pad_set_unlink_function_full (GstPad *pad,
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GstPadUnlinkFunction unlink,
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|
gpointer user_data,
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|
GDestroyNotify notify);
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|
#define gst_pad_set_link_function(p,f) gst_pad_set_link_function_full((p),(f),NULL,NULL)
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#define gst_pad_set_unlink_function(p,f) gst_pad_set_unlink_function_full((p),(f),NULL,NULL)
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GST_API
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gboolean gst_pad_can_link (GstPad *srcpad, GstPad *sinkpad);
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GST_API
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GstPadLinkReturn gst_pad_link (GstPad *srcpad, GstPad *sinkpad);
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GST_API
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GstPadLinkReturn gst_pad_link_full (GstPad *srcpad, GstPad *sinkpad, GstPadLinkCheck flags);
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GST_API
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gboolean gst_pad_unlink (GstPad *srcpad, GstPad *sinkpad);
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GST_API
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|
gboolean gst_pad_is_linked (GstPad *pad);
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|
GST_API
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|
GstPad* gst_pad_get_peer (GstPad *pad);
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|
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|
GST_API
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|
GstCaps* gst_pad_get_pad_template_caps (GstPad *pad);
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|
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|
/* capsnego function for linked/unlinked pads */
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GST_API
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|
GstCaps * gst_pad_get_current_caps (GstPad * pad);
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|
GST_API
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|
gboolean gst_pad_has_current_caps (GstPad * pad);
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|
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|
/* capsnego for linked pads */
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|
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GST_API
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|
GstCaps * gst_pad_get_allowed_caps (GstPad * pad);
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|
/* pad offsets */
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|
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GST_API
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|
gint64 gst_pad_get_offset (GstPad *pad);
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|
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|
GST_API
|
|
void gst_pad_set_offset (GstPad *pad, gint64 offset);
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|
|
|
/* data passing functions to peer */
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|
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|
GST_API
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|
GstFlowReturn gst_pad_push (GstPad *pad, GstBuffer *buffer);
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|
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|
GST_API
|
|
GstFlowReturn gst_pad_push_list (GstPad *pad, GstBufferList *list);
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|
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|
GST_API
|
|
GstFlowReturn gst_pad_pull_range (GstPad *pad, guint64 offset, guint size,
|
|
GstBuffer **buffer);
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|
GST_API
|
|
gboolean gst_pad_push_event (GstPad *pad, GstEvent *event);
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|
|
|
GST_API
|
|
gboolean gst_pad_event_default (GstPad *pad, GstObject *parent,
|
|
GstEvent *event);
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|
GST_API
|
|
GstFlowReturn gst_pad_get_last_flow_return (GstPad *pad);
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|
|
|
/* data passing functions on pad */
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|
|
|
GST_API
|
|
GstFlowReturn gst_pad_chain (GstPad *pad, GstBuffer *buffer);
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|
|
|
GST_API
|
|
GstFlowReturn gst_pad_chain_list (GstPad *pad, GstBufferList *list);
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|
|
|
GST_API
|
|
GstFlowReturn gst_pad_get_range (GstPad *pad, guint64 offset, guint size,
|
|
GstBuffer **buffer);
|
|
GST_API
|
|
gboolean gst_pad_send_event (GstPad *pad, GstEvent *event);
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|
|
|
/* pad tasks */
|
|
|
|
GST_API
|
|
gboolean gst_pad_start_task (GstPad *pad, GstTaskFunction func,
|
|
gpointer user_data, GDestroyNotify notify);
|
|
GST_API
|
|
gboolean gst_pad_pause_task (GstPad *pad);
|
|
|
|
GST_API
|
|
gboolean gst_pad_stop_task (GstPad *pad);
|
|
|
|
GST_API
|
|
GstTaskState gst_pad_get_task_state (GstPad *pad);
|
|
|
|
/* internal links */
|
|
|
|
GST_API
|
|
void gst_pad_set_iterate_internal_links_function_full (GstPad * pad,
|
|
GstPadIterIntLinkFunction iterintlink,
|
|
gpointer user_data,
|
|
GDestroyNotify notify);
|
|
|
|
GST_API
|
|
GstIterator * gst_pad_iterate_internal_links (GstPad * pad);
|
|
|
|
GST_API
|
|
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)
|
|
|
|
GST_API
|
|
GstPad * gst_pad_get_single_internal_link (GstPad * pad);
|
|
|
|
/* generic query function */
|
|
|
|
GST_API
|
|
gboolean gst_pad_query (GstPad *pad, GstQuery *query);
|
|
|
|
GST_API
|
|
gboolean gst_pad_peer_query (GstPad *pad, GstQuery *query);
|
|
|
|
GST_API
|
|
void gst_pad_set_query_function_full (GstPad *pad, GstPadQueryFunction query,
|
|
gpointer user_data,
|
|
GDestroyNotify notify);
|
|
GST_API
|
|
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 */
|
|
|
|
GST_API
|
|
gboolean gst_pad_forward (GstPad *pad, GstPadForwardFunction forward,
|
|
gpointer user_data);
|
|
|
|
G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstPad, gst_object_unref)
|
|
|
|
G_END_DECLS
|
|
|
|
#endif /* __GST_PAD_H__ */
|