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983 lines
40 KiB
C
983 lines
40 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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, 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 <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 occured. 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. Since 0.10.7.
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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). Since 0.10.29.
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* @GST_FLOW_CUSTOM_SUCCESS_2: Pre-defined custom success code. Since 0.10.29.
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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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* Since 0.10.7.
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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). Since 0.10.29.
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* @GST_FLOW_CUSTOM_ERROR_2: Pre-defined custom error code. Since 0.10.29.
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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 and are available since 0.10.7.
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*/
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/* FIXME 0.11: remove custom flow returns */
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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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const gchar* gst_flow_get_name (GstFlowReturn ret);
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GQuark gst_flow_to_quark (GstFlowReturn 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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*
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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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* <warning><para>
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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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* </para></warning>
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*
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* Since: 0.10.30
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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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} GstPadLinkCheck;
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/**
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* GST_PAD_LINK_CHECK_DEFAULT:
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*
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* The default checks done when linking pads (i.e. the ones used by
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* gst_pad_link()).
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*
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* Since: 0.10.30
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*/
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#define GST_PAD_LINK_CHECK_DEFAULT ((GstPadLinkCheck) (GST_PAD_LINK_CHECK_HIERARCHY | GST_PAD_LINK_CHECK_CAPS))
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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: the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT flag is set,
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* @parent is guaranteed to be not-NULL and remain valid during the
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* execution of this function.
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* @buffer: 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: the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT flag is set,
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* @parent is guaranteed to be not-NULL and remain valid during the
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* execution of this function.
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* @list: 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: the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT flag is set,
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* @parent is guaranteed to be not-NULL and remain valid during the
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* 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_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: the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT flag is set,
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* @parent is guaranteed to be not-NULL and remain valid during the
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* execution of this function.
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* @event: 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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/* 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: the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT flag is set,
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* @parent is guaranteed to be not-NULL and remain valid during the
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* 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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* Since 0.10.21
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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: the parent of @pad. If the #GST_PAD_FLAG_NEED_PARENT flag is set,
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* @parent is guaranteed to be not-NULL and remain valid during the
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* 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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* @peer: the peer #GstPad of the link
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*
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* Function signature to handle a new link on the pad.
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*
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* Returns: the result of the link with the specified peer.
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*/
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typedef GstPadLinkReturn (*GstPadLinkFunction) (GstPad *pad, GstPad *peer);
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/**
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* GstPadUnlinkFunction
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* @pad: the #GstPad that is linked.
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*
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* Function signature to handle a unlinking the pad prom its peer.
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*/
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typedef void (*GstPadUnlinkFunction) (GstPad *pad);
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/* misc */
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/**
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* GstPadForwardFunction:
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* @pad: the #GstPad that is forwarded.
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* @user_data: the gpointer to optional user data.
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*
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* A forward function is called for all internally linked pads, see
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* gst_pad_forward().
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*
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* Returns: TRUE if the dispatching procedure has to be stopped.
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*/
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typedef gboolean (*GstPadForwardFunction) (GstPad *pad, gpointer user_data);
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/**
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* GstPadProbeType:
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* @GST_PAD_PROBE_TYPE_INVALID: invalid probe type
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* @GST_PAD_PROBE_TYPE_IDLE: probe idle pads and block
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* @GST_PAD_PROBE_TYPE_BLOCK: probe and block pads
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* @GST_PAD_PROBE_TYPE_BUFFER: probe buffers
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* @GST_PAD_PROBE_TYPE_BUFFER_LIST: probe buffer lists
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* @GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM: probe downstream events
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* @GST_PAD_PROBE_TYPE_EVENT_UPSTREAM: probe upstream events
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|
* @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
|
|
*
|
|
* 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)
|
|
} GstPadProbeType;
|
|
|
|
#define GST_PAD_PROBE_TYPE_BLOCKING (GST_PAD_PROBE_TYPE_IDLE | GST_PAD_PROBE_TYPE_BLOCK)
|
|
#define GST_PAD_PROBE_TYPE_BLOCK_DOWNSTREAM (GST_PAD_PROBE_TYPE_BLOCK | GST_PAD_PROBE_TYPE_DATA_DOWNSTREAM)
|
|
#define GST_PAD_PROBE_TYPE_BLOCK_UPSTREAM (GST_PAD_PROBE_TYPE_BLOCK | GST_PAD_PROBE_TYPE_DATA_UPSTREAM)
|
|
#define GST_PAD_PROBE_TYPE_DATA_DOWNSTREAM (GST_PAD_PROBE_TYPE_BUFFER | GST_PAD_PROBE_TYPE_BUFFER_LIST | \
|
|
GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM)
|
|
#define GST_PAD_PROBE_TYPE_DATA_UPSTREAM (GST_PAD_PROBE_TYPE_EVENT_UPSTREAM)
|
|
#define GST_PAD_PROBE_TYPE_DATA_BOTH (GST_PAD_PROBE_TYPE_DATA_DOWNSTREAM | \
|
|
GST_PAD_PROBE_TYPE_DATA_UPSTREAM)
|
|
#define GST_PAD_PROBE_TYPE_EVENT_BOTH (GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM | \
|
|
GST_PAD_PROBE_TYPE_EVENT_UPSTREAM)
|
|
#define GST_PAD_PROBE_TYPE_QUERY_BOTH (GST_PAD_PROBE_TYPE_QUERY_DOWNSTREAM | \
|
|
GST_PAD_PROBE_TYPE_QUERY_UPSTREAM)
|
|
#define GST_PAD_PROBE_TYPE_ALL_BOTH (GST_PAD_PROBE_TYPE_DATA_BOTH | \
|
|
GST_PAD_PROBE_TYPE_QUERY_BOTH)
|
|
#define GST_PAD_PROBE_TYPE_SCHEDULING (GST_PAD_PROBE_TYPE_PUSH | GST_PAD_PROBE_TYPE_PULL)
|
|
|
|
/**
|
|
* 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)
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
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.
|
|
* When @event has been made writable, the new buffer reference can be assigned
|
|
* to @event. 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 refusing buffers
|
|
* @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_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_BLOCKING = (GST_OBJECT_FLAG_LAST << 2),
|
|
GST_PAD_FLAG_NEED_PARENT = (GST_OBJECT_FLAG_LAST << 3),
|
|
GST_PAD_FLAG_NEED_RECONFIGURE = (GST_OBJECT_FLAG_LAST << 4),
|
|
GST_PAD_FLAG_PENDING_EVENTS = (GST_OBJECT_FLAG_LAST << 5),
|
|
GST_PAD_FLAG_FIXED_CAPS = (GST_OBJECT_FLAG_LAST << 6),
|
|
GST_PAD_FLAG_PROXY_CAPS = (GST_OBJECT_FLAG_LAST << 7),
|
|
GST_PAD_FLAG_PROXY_ALLOCATION = (GST_OBJECT_FLAG_LAST << 8),
|
|
/* 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_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))
|
|
|
|
/**
|
|
* 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);
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gboolean gst_pad_is_blocking (GstPad *pad);
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void gst_pad_mark_reconfigure (GstPad *pad);
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gboolean gst_pad_check_reconfigure (GstPad *pad);
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void gst_pad_set_element_private (GstPad *pad, gpointer priv);
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gpointer gst_pad_get_element_private (GstPad *pad);
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GstPadTemplate* gst_pad_get_pad_template (GstPad *pad);
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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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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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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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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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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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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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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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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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#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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/* pad links */
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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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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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gboolean gst_pad_can_link (GstPad *srcpad, GstPad *sinkpad);
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GstPadLinkReturn gst_pad_link (GstPad *srcpad, GstPad *sinkpad);
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GstPadLinkReturn gst_pad_link_full (GstPad *srcpad, GstPad *sinkpad, GstPadLinkCheck flags);
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gboolean gst_pad_unlink (GstPad *srcpad, GstPad *sinkpad);
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gboolean gst_pad_is_linked (GstPad *pad);
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GstPad* gst_pad_get_peer (GstPad *pad);
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GstCaps* gst_pad_get_pad_template_caps (GstPad *pad);
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/* capsnego function for linked/unlinked pads */
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GstCaps * gst_pad_get_current_caps (GstPad * pad);
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gboolean gst_pad_has_current_caps (GstPad * pad);
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gboolean gst_pad_set_caps (GstPad * pad, GstCaps *caps);
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/* capsnego for linked pads */
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GstCaps * gst_pad_get_allowed_caps (GstPad * pad);
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/* pad offsets */
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gint64 gst_pad_get_offset (GstPad *pad);
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void gst_pad_set_offset (GstPad *pad, gint64 offset);
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/* data passing functions to peer */
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GstFlowReturn gst_pad_push (GstPad *pad, GstBuffer *buffer);
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GstFlowReturn gst_pad_push_list (GstPad *pad, GstBufferList *list);
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GstFlowReturn gst_pad_pull_range (GstPad *pad, guint64 offset, guint size,
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GstBuffer **buffer);
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gboolean gst_pad_push_event (GstPad *pad, GstEvent *event);
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gboolean gst_pad_event_default (GstPad *pad, GstObject *parent,
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GstEvent *event);
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/* data passing functions on pad */
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GstFlowReturn gst_pad_chain (GstPad *pad, GstBuffer *buffer);
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GstFlowReturn gst_pad_chain_list (GstPad *pad, GstBufferList *list);
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GstFlowReturn gst_pad_get_range (GstPad *pad, guint64 offset, guint size,
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GstBuffer **buffer);
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gboolean gst_pad_send_event (GstPad *pad, GstEvent *event);
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/* pad tasks */
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gboolean gst_pad_start_task (GstPad *pad, GstTaskFunction func,
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gpointer data);
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gboolean gst_pad_pause_task (GstPad *pad);
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gboolean gst_pad_stop_task (GstPad *pad);
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/* internal links */
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void gst_pad_set_iterate_internal_links_function_full (GstPad * pad,
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GstPadIterIntLinkFunction iterintlink,
|
|
gpointer user_data,
|
|
GDestroyNotify notify);
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GstIterator * gst_pad_iterate_internal_links (GstPad * pad);
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GstIterator * gst_pad_iterate_internal_links_default (GstPad * pad, GstObject *parent);
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#define gst_pad_set_iterate_internal_links_function(p,f) gst_pad_set_iterate_internal_links_function_full((p),(f),NULL,NULL)
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/* generic query function */
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gboolean gst_pad_query (GstPad *pad, GstQuery *query);
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gboolean gst_pad_peer_query (GstPad *pad, GstQuery *query);
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void gst_pad_set_query_function_full (GstPad *pad, GstPadQueryFunction query,
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|
gpointer user_data,
|
|
GDestroyNotify notify);
|
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gboolean gst_pad_query_default (GstPad *pad, GstObject *parent,
|
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GstQuery *query);
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#define gst_pad_set_query_function(p,f) gst_pad_set_query_function_full((p),(f),NULL,NULL)
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/* misc helper functions */
|
|
gboolean gst_pad_forward (GstPad *pad, GstPadForwardFunction forward,
|
|
gpointer user_data);
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G_END_DECLS
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#endif /* __GST_PAD_H__ */
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