/*
 * This file is part of gtkD.
 *
 * gtkD is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 3
 * of the License, or (at your option) any later version, with
 * some exceptions, please read the COPYING file.
 *
 * gtkD is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with gtkD; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110, USA
 */
 
// generated automatically - do not change
// find conversion definition on APILookup.txt
// implement new conversion functionalities on the wrap.utils pakage

/*
 * Conversion parameters:
 * inFile  = GstPad.html
 * outPack = gstreamer
 * outFile = Pad
 * strct   = GstPad
 * realStrct=
 * ctorStrct=
 * clss    = Pad
 * interf  = 
 * class Code: Yes
 * interface Code: No
 * template for:
 * extend  = 
 * implements:
 * prefixes:
 * 	- gst_pad_
 * 	- gst_
 * omit structs:
 * omit prefixes:
 * omit code:
 * 	- gst_pad_load_and_link
 * omit signals:
 * imports:
 * 	- glib.Str
 * 	- gstreamer.Element
 * 	- gstreamer.MiniObject
 * 	- gstreamer.PadTemplate
 * 	- gstreamer.Caps
 * 	- gstreamer.Buffer
 * 	- gstreamer.Event
 * 	- gstreamer.Query
 * 	- glib.ListG
 * structWrap:
 * 	- GList* -> ListG
 * 	- GstBuffer* -> Buffer
 * 	- GstCaps* -> Caps
 * 	- GstElement* -> Element
 * 	- GstEvent* -> Event
 * 	- GstMiniObject* -> MiniObject
 * 	- GstPad* -> Pad
 * 	- GstPadTemplate* -> PadTemplate
 * 	- GstQuery* -> Query
 * module aliases:
 * local aliases:
 * overrides:
 */

module gstreamer.Pad;

public  import gstreamerc.gstreamertypes;

private import gstreamerc.gstreamer;
private import glib.ConstructionException;
private import gobject.ObjectG;

private import gobject.Signals;
public  import gtkc.gdktypes;

private import glib.Str;
private import gstreamer.Element;
private import gstreamer.MiniObject;
private import gstreamer.PadTemplate;
private import gstreamer.Caps;
private import gstreamer.Buffer;
private import gstreamer.Event;
private import gstreamer.Query;
private import glib.ListG;



private import gstreamer.ObjectGst;

/**
 * Description
 * A GstElement is linked to other elements via "pads", which are extremely
 * light-weight generic link points.
 * After two pads are retrieved from an element with gst_element_get_pad(),
 * the pads can be link with gst_pad_link(). (For quick links,
 * you can also use gst_element_link(), which will make the obvious
 * link for you if it's straightforward.)
 * Pads are typically created from a GstPadTemplate with
 * gst_pad_new_from_template().
 * Pads have GstCaps attached to it to describe the media type they are
 * capable of dealing with. gst_pad_get_caps() and gst_pad_set_caps() are
 * used to manipulate the caps of the pads.
 * Pads created from a pad template cannot set capabilities that are
 * incompatible with the pad template capabilities.
 * Pads without pad templates can be created with gst_pad_new(),
 * which takes a direction and a name as an argument. If the name is NULL,
 * then a guaranteed unique name will be assigned to it.
 * gst_pad_get_parent() will retrieve the GstElement that owns the pad.
 * A GstElement creating a pad will typically use the various
 * gst_pad_set_*_function() calls to register callbacks for various events
 * on the pads.
 * GstElements will use gst_pad_push() and gst_pad_pull_range() to push out
 * or pull in a buffer.
 * To send a GstEvent on a pad, use gst_pad_send_event() and
 * gst_pad_push_event().
 * Last reviewed on 2006-07-06 (0.10.9)
 */
public class Pad : ObjectGst
{
	
	/** the main Gtk struct */
	protected GstPad* gstPad;
	
	
	public GstPad* getPadStruct()
	{
		return gstPad;
	}
	
	
	/** the main Gtk struct as a void* */
	protected override void* getStruct()
	{
		return cast(void*)gstPad;
	}
	
	/**
	 * Sets our main struct and passes it to the parent class
	 */
	public this (GstPad* gstPad)
	{
		super(cast(GstObject*)gstPad);
		this.gstPad = gstPad;
	}
	
	protected override void setStruct(GObject* obj)
	{
		super.setStruct(obj);
		gstPad = cast(GstPad*)obj;
	}
	
	/**
	 * Sets our main struct and passes it to the parent class.
	 * This one is additional to make gstreamer.Element addOnPadAdded()
	 * working without changes.
	 */
	public this (GObject* gstPad)
	{
		super(cast(GstObject*)gstPad);
		this.gstPad = cast(GstPad*) gstPad;
	}
	
	/**
	 * Queries a pad for the stream position.
	 * This is a convenience function for gstreamerD.
	 * Returns:
	 *  The current position in nanoseconds - GstFormat.TIME.
	 */
	public long queryPosition()
	{
		GstFormat form = GstFormat.TIME;
		long cur_pos;
		queryPosition( form, cur_pos );
		return cur_pos;
	}
	
	/**
	 * Queries a pad for the stream duration.
	 * This is a convenience function for gstreamerD.
	 * Returns:
	 *  The duration in nanoseconds - GstFormat.TIME.
	 */
	public long queryDuration()
	{
		GstFormat form = GstFormat.TIME;
		long cur_dur;
		queryDuration( form, cur_dur );
		return cur_dur;
	}
	
	
	/**
	 */
	int[string] connectedSignals;
	
	bool delegate(MiniObject, Pad)[] onHaveDataListeners;
	/**
	 * Signals that new data is available on the pad. This signal is used
	 * internally for implementing pad probes.
	 * See gst_pad_add_*_probe functions.
	 */
	void addOnHaveData(bool delegate(MiniObject, Pad) dlg, ConnectFlags connectFlags=cast(ConnectFlags)0)
	{
		if ( !("have-data" in connectedSignals) )
		{
			Signals.connectData(
			getStruct(),
			"have-data",
			cast(GCallback)&callBackHaveData,
			cast(void*)this,
			null,
			connectFlags);
			connectedSignals["have-data"] = 1;
		}
		onHaveDataListeners ~= dlg;
	}
	extern(C) static gboolean callBackHaveData(GstPad* padStruct, GstMiniObject* miniObj, Pad _pad)
	{
		foreach ( bool delegate(MiniObject, Pad) dlg ; _pad.onHaveDataListeners )
		{
			if ( dlg(ObjectG.getDObject!(MiniObject)(miniObj), _pad) )
			{
				return 1;
			}
		}
		
		return 0;
	}
	
	void delegate(Pad, Pad)[] onLinkedListeners;
	/**
	 * Signals that a pad has been linked to the peer pad.
	 */
	void addOnLinked(void delegate(Pad, Pad) dlg, ConnectFlags connectFlags=cast(ConnectFlags)0)
	{
		if ( !("linked" in connectedSignals) )
		{
			Signals.connectData(
			getStruct(),
			"linked",
			cast(GCallback)&callBackLinked,
			cast(void*)this,
			null,
			connectFlags);
			connectedSignals["linked"] = 1;
		}
		onLinkedListeners ~= dlg;
	}
	extern(C) static void callBackLinked(GstPad* padStruct, GstPad* peer, Pad _pad)
	{
		foreach ( void delegate(Pad, Pad) dlg ; _pad.onLinkedListeners )
		{
			dlg(ObjectG.getDObject!(Pad)(peer), _pad);
		}
	}
	
	void delegate(Pad)[] onRequestLinkListeners;
	/**
	 * Signals that a pad connection has been requested.
	 */
	void addOnRequestLink(void delegate(Pad) dlg, ConnectFlags connectFlags=cast(ConnectFlags)0)
	{
		if ( !("request-link" in connectedSignals) )
		{
			Signals.connectData(
			getStruct(),
			"request-link",
			cast(GCallback)&callBackRequestLink,
			cast(void*)this,
			null,
			connectFlags);
			connectedSignals["request-link"] = 1;
		}
		onRequestLinkListeners ~= dlg;
	}
	extern(C) static void callBackRequestLink(GstPad* padStruct, Pad _pad)
	{
		foreach ( void delegate(Pad) dlg ; _pad.onRequestLinkListeners )
		{
			dlg(_pad);
		}
	}
	
	void delegate(Pad, Pad)[] onUnlinkedListeners;
	/**
	 * Signals that a pad has been unlinked from the peer pad.
	 * See Also
	 * GstPadTemplate, GstElement, GstEvent
	 */
	void addOnUnlinked(void delegate(Pad, Pad) dlg, ConnectFlags connectFlags=cast(ConnectFlags)0)
	{
		if ( !("unlinked" in connectedSignals) )
		{
			Signals.connectData(
			getStruct(),
			"unlinked",
			cast(GCallback)&callBackUnlinked,
			cast(void*)this,
			null,
			connectFlags);
			connectedSignals["unlinked"] = 1;
		}
		onUnlinkedListeners ~= dlg;
	}
	extern(C) static void callBackUnlinked(GstPad* padStruct, GstPad* peer, Pad _pad)
	{
		foreach ( void delegate(Pad, Pad) dlg ; _pad.onUnlinkedListeners )
		{
			dlg(ObjectG.getDObject!(Pad)(peer), _pad);
		}
	}
	
	
	/**
	 * Gets the direction of the pad. The direction of the pad is
	 * decided at construction time so this function does not take
	 * the LOCK.
	 * Returns: the GstPadDirection of the pad. MT safe.
	 */
	public GstPadDirection getDirection()
	{
		// GstPadDirection gst_pad_get_direction (GstPad *pad);
		return gst_pad_get_direction(gstPad);
	}
	
	/**
	 * Gets the parent of pad, cast to a GstElement. If a pad has no parent or
	 * its parent is not an element, return NULL.
	 * Returns: The parent of the pad. The caller has a reference on the parent, so unref when you're finished with it. MT safe.
	 */
	public Element getParentElement()
	{
		// GstElement* gst_pad_get_parent_element (GstPad *pad);
		auto p = gst_pad_get_parent_element(gstPad);
		
		if(p is null)
		{
			return null;
		}
		
		return ObjectG.getDObject!(Element)(cast(GstElement*) p);
	}
	
	/**
	 * Gets the template for pad.
	 * Returns: the GstPadTemplate from which this pad was instantiated, or NULL if this pad has no template. FIXME: currently returns an unrefcounted padtemplate.
	 */
	public PadTemplate getPadTemplate()
	{
		// GstPadTemplate* gst_pad_get_pad_template (GstPad *pad);
		auto p = gst_pad_get_pad_template(gstPad);
		
		if(p is null)
		{
			return null;
		}
		
		return ObjectG.getDObject!(PadTemplate)(cast(GstPadTemplate*) p);
	}
	
	/**
	 * Links the source pad and the sink pad.
	 * Params:
	 * sinkpad = the sink GstPad to link.
	 * Returns: A result code indicating if the connection worked or what went wrong. MT Safe.
	 */
	public GstPadLinkReturn link(Pad sinkpad)
	{
		// GstPadLinkReturn gst_pad_link (GstPad *srcpad,  GstPad *sinkpad);
		return gst_pad_link(gstPad, (sinkpad is null) ? null : sinkpad.getPadStruct());
	}
	
	/**
	 * Unlinks the source pad from the sink pad. Will emit the "unlinked" signal on
	 * both pads.
	 * Params:
	 * sinkpad = the sink GstPad to unlink.
	 * Returns: TRUE if the pads were unlinked. This function returns FALSE if the pads were not linked together. MT safe.
	 */
	public int unlink(Pad sinkpad)
	{
		// gboolean gst_pad_unlink (GstPad *srcpad,  GstPad *sinkpad);
		return gst_pad_unlink(gstPad, (sinkpad is null) ? null : sinkpad.getPadStruct());
	}
	
	/**
	 * Checks if a pad is linked to another pad or not.
	 * Returns: TRUE if the pad is linked, FALSE otherwise. MT safe.
	 */
	public int isLinked()
	{
		// gboolean gst_pad_is_linked (GstPad *pad);
		return gst_pad_is_linked(gstPad);
	}
	
	/**
	 * Checks if the source pad and the sink pad can be linked.
	 * Both srcpad and sinkpad must be unlinked.
	 * Params:
	 * sinkpad = the sink GstPad to link.
	 * Returns: TRUE if the pads can be linked, FALSE otherwise.
	 */
	public int canLink(Pad sinkpad)
	{
		// gboolean gst_pad_can_link (GstPad *srcpad,  GstPad *sinkpad);
		return gst_pad_can_link(gstPad, (sinkpad is null) ? null : sinkpad.getPadStruct());
	}
	
	/**
	 * Gets the capabilities this pad can produce or consume.
	 * Note that this method doesn't necessarily return the caps set by
	 * gst_pad_set_caps() - use GST_PAD_CAPS for that instead.
	 * gst_pad_get_caps returns all possible caps a pad can operate with, using
	 * the pad's get_caps function;
	 * this returns the pad template caps if not explicitly set.
	 * Returns: a newly allocated copy of the GstCaps of this pad. MT safe.
	 */
	public Caps getCaps()
	{
		// GstCaps* gst_pad_get_caps (GstPad *pad);
		auto p = gst_pad_get_caps(gstPad);
		
		if(p is null)
		{
			return null;
		}
		
		return ObjectG.getDObject!(Caps)(cast(GstCaps*) p);
	}
	
	/**
	 * Gets the capabilities of the allowed media types that can flow through
	 * pad and its peer.
	 * The allowed capabilities is calculated as the intersection of the results of
	 * calling gst_pad_get_caps() on pad and its peer. The caller owns a reference
	 * on the resulting caps.
	 * Returns: the allowed GstCaps of the pad link. Unref the caps when you no longer need it. This function returns NULL when pad has no peer. MT safe.
	 */
	public Caps getAllowedCaps()
	{
		// GstCaps* gst_pad_get_allowed_caps (GstPad *pad);
		auto p = gst_pad_get_allowed_caps(gstPad);
		
		if(p is null)
		{
			return null;
		}
		
		return ObjectG.getDObject!(Caps)(cast(GstCaps*) p);
	}
	
	/**
	 * Gets the capabilities of the media type that currently flows through pad
	 * and its peer.
	 * This function can be used on both src and sinkpads. Note that srcpads are
	 * always negotiated before sinkpads so it is possible that the negotiated caps
	 * on the srcpad do not match the negotiated caps of the peer.
	 * Returns: the negotiated GstCaps of the pad link. Unref the caps when you no longer need it. This function returns NULL when the pad has no peer or is not negotiated yet. MT safe.
	 */
	public Caps getNegotiatedCaps()
	{
		// GstCaps* gst_pad_get_negotiated_caps (GstPad *pad);
		auto p = gst_pad_get_negotiated_caps(gstPad);
		
		if(p is null)
		{
			return null;
		}
		
		return ObjectG.getDObject!(Caps)(cast(GstCaps*) p);
	}
	
	/**
	 * Gets the capabilities for pad's template.
	 * Returns: the GstCaps of this pad template. If you intend to keep a reference on the caps, make a copy (see gst_caps_copy()).
	 */
	public Caps getPadTemplateCaps()
	{
		// const GstCaps* gst_pad_get_pad_template_caps (GstPad *pad);
		auto p = gst_pad_get_pad_template_caps(gstPad);
		
		if(p is null)
		{
			return null;
		}
		
		return ObjectG.getDObject!(Caps)(cast(GstCaps*) p);
	}
	
	/**
	 * Sets the capabilities of this pad. The caps must be fixed. Any previous
	 * caps on the pad will be unreffed. This function refs the caps so you should
	 * unref if as soon as you don't need it anymore.
	 * It is possible to set NULL caps, which will make the pad unnegotiated
	 * again.
	 * Params:
	 * caps = a GstCaps to set.
	 * Returns: TRUE if the caps could be set. FALSE if the caps were not fixed or bad parameters were provided to this function. MT safe.
	 */
	public int setCaps(Caps caps)
	{
		// gboolean gst_pad_set_caps (GstPad *pad,  GstCaps *caps);
		return gst_pad_set_caps(gstPad, (caps is null) ? null : caps.getCapsStruct());
	}
	
	/**
	 * Gets the peer of pad. This function refs the peer pad so
	 * you need to unref it after use.
	 * Returns: the peer GstPad. Unref after usage. MT safe.
	 */
	public Pad getPeer()
	{
		// GstPad* gst_pad_get_peer (GstPad *pad);
		auto p = gst_pad_get_peer(gstPad);
		
		if(p is null)
		{
			return null;
		}
		
		return ObjectG.getDObject!(Pad)(cast(GstPad*) p);
	}
	
	/**
	 * Gets the capabilities of the peer connected to this pad.
	 * Returns: the GstCaps of the peer pad. This function returns a new caps, so use gst_caps_unref to get rid of it. this function returns NULL if there is no peer pad.
	 */
	public Caps peerGetCaps()
	{
		// GstCaps* gst_pad_peer_get_caps (GstPad *pad);
		auto p = gst_pad_peer_get_caps(gstPad);
		
		if(p is null)
		{
			return null;
		}
		
		return ObjectG.getDObject!(Caps)(cast(GstCaps*) p);
	}
	
	/**
	 * A helper function you can use that sets the
	 * gst_pad_get_fixed_caps_func as the getcaps function for the
	 * pad. This way the function will always return the negotiated caps
	 * or in case the pad is not negotiated, the padtemplate caps.
	 * Use this function on a pad that, once _set_caps() has been called
	 * on it, cannot be renegotiated to something else.
	 */
	public void useFixedCaps()
	{
		// void gst_pad_use_fixed_caps (GstPad *pad);
		gst_pad_use_fixed_caps(gstPad);
	}
	
	/**
	 * Query if a pad is active
	 * Returns: TRUE if the pad is active. MT safe.
	 */
	public int isActive()
	{
		// gboolean gst_pad_is_active (GstPad *pad);
		return gst_pad_is_active(gstPad);
	}
	
	/**
	 * Blocks or unblocks the dataflow on a pad. This function is
	 * a shortcut for gst_pad_set_blocked_async() with a NULL
	 * callback.
	 * Params:
	 * blocked = boolean indicating we should block or unblock
	 * Returns: TRUE if the pad could be blocked. This function can fail if the wrong parameters were passed or the pad was already in the requested state. MT safe.
	 */
	public int setBlocked(int blocked)
	{
		// gboolean gst_pad_set_blocked (GstPad *pad,  gboolean blocked);
		return gst_pad_set_blocked(gstPad, blocked);
	}
	
	/**
	 * Blocks or unblocks the dataflow on a pad. The provided callback
	 * is called when the operation succeeds; this happens right before the next
	 * attempt at pushing a buffer on the pad.
	 * This can take a while as the pad can only become blocked when real dataflow
	 * is happening.
	 * When the pipeline is stalled, for example in PAUSED, this can
	 * take an indeterminate amount of time.
	 * You can pass NULL as the callback to make this call block. Be careful with
	 * this blocking call as it might not return for reasons stated above.
	 * Params:
	 * blocked = boolean indicating whether the pad should be blocked or unblocked
	 * callback = GstPadBlockCallback that will be called when the
	 *  operation succeeds
	 * userData = user data passed to the callback
	 * Returns: TRUE if the pad could be blocked. This function can fail if the wrong parameters were passed or the pad was already in the requested state. MT safe.
	 */
	public int setBlockedAsync(int blocked, GstPadBlockCallback callback, void* userData)
	{
		// gboolean gst_pad_set_blocked_async (GstPad *pad,  gboolean blocked,  GstPadBlockCallback callback,  gpointer user_data);
		return gst_pad_set_blocked_async(gstPad, blocked, callback, userData);
	}
	
	/**
	 * Checks if the pad is blocked or not. This function returns the
	 * last requested state of the pad. It is not certain that the pad
	 * is actually blocking at this point (see gst_pad_is_blocking()).
	 * Returns: TRUE if the pad is blocked. MT safe.
	 */
	public int isBlocked()
	{
		// gboolean gst_pad_is_blocked (GstPad *pad);
		return gst_pad_is_blocked(gstPad);
	}
	
	/**
	 * Checks if the pad is blocking or not. This is a guaranteed state
	 * of whether the pad is actually blocking on a GstBuffer or a GstEvent.
	 * Returns: TRUE if the pad is blocking. MT safe. Since 0.10.11
	 */
	public int isBlocking()
	{
		// gboolean gst_pad_is_blocking (GstPad *pad);
		return gst_pad_is_blocking(gstPad);
	}
	
	/**
	 * Adds a "data probe" to a pad. This function will be called whenever data
	 * passes through a pad. In this case data means both events and buffers. The
	 * probe will be called with the data as an argument, meaning handler should
	 * have the same callback signature as the 'have-data' signal of GstPad.
	 * Note that the data will have a reference count greater than 1, so it will
	 * be immutable -- you must not change it.
	 * For source pads, the probe will be called after the blocking function, if any
	 * (see gst_pad_set_blocked_async()), but before looking up the peer to chain
	 * to. For sink pads, the probe function will be called before configuring the
	 * sink with new caps, if any, and before calling the pad's chain function.
	 * Your data probe should return TRUE to let the data continue to flow, or FALSE
	 * to drop it. Dropping data is rarely useful, but occasionally comes in handy
	 * with events.
	 * Although probes are implemented internally by connecting handler to the
	 * have-data signal on the pad, if you want to remove a probe it is insufficient
	 * to only call g_signal_handler_disconnect on the returned handler id. To
	 * remove a probe, use the appropriate function, such as
	 * gst_pad_remove_data_probe().
	 * Params:
	 * handler = function to call when data is passed over pad
	 * data = data to pass along with the handler
	 * Returns: The handler id.
	 */
	public gulong addDataProbe(GCallback handler, void* data)
	{
		// gulong gst_pad_add_data_probe (GstPad *pad,  GCallback handler,  gpointer data);
		return gst_pad_add_data_probe(gstPad, handler, data);
	}
	
	/**
	 * Adds a probe that will be called for all buffers passing through a pad. See
	 * gst_pad_add_data_probe() for more information.
	 * Params:
	 * handler = function to call when data is passed over pad
	 * data = data to pass along with the handler
	 * Returns: The handler id
	 */
	public gulong addBufferProbe(GCallback handler, void* data)
	{
		// gulong gst_pad_add_buffer_probe (GstPad *pad,  GCallback handler,  gpointer data);
		return gst_pad_add_buffer_probe(gstPad, handler, data);
	}
	
	/**
	 * Adds a probe that will be called for all events passing through a pad. See
	 * gst_pad_add_data_probe() for more information.
	 * Params:
	 * handler = function to call when data is passed over pad
	 * data = data to pass along with the handler
	 * Returns: The handler id
	 */
	public gulong addEventProbe(GCallback handler, void* data)
	{
		// gulong gst_pad_add_event_probe (GstPad *pad,  GCallback handler,  gpointer data);
		return gst_pad_add_event_probe(gstPad, handler, data);
	}
	
	/**
	 * Removes a data probe from pad.
	 * Params:
	 * handlerId = handler id returned from gst_pad_add_data_probe
	 */
	public void removeDataProbe(uint handlerId)
	{
		// void gst_pad_remove_data_probe (GstPad *pad,  guint handler_id);
		gst_pad_remove_data_probe(gstPad, handlerId);
	}
	
	/**
	 * Removes a buffer probe from pad.
	 * Params:
	 * handlerId = handler id returned from gst_pad_add_buffer_probe
	 */
	public void removeBufferProbe(uint handlerId)
	{
		// void gst_pad_remove_buffer_probe (GstPad *pad,  guint handler_id);
		gst_pad_remove_buffer_probe(gstPad, handlerId);
	}
	
	/**
	 * Removes an event probe from pad.
	 * Params:
	 * handlerId = handler id returned from gst_pad_add_event_probe
	 */
	public void removeEventProbe(uint handlerId)
	{
		// void gst_pad_remove_event_probe (GstPad *pad,  guint handler_id);
		gst_pad_remove_event_probe(gstPad, handlerId);
	}
	
	/**
	 * Creates a new pad with the given name in the given direction.
	 * If name is NULL, a guaranteed unique name (across all pads)
	 * will be assigned.
	 * This function makes a copy of the name so you can safely free the name.
	 * Params:
	 * name = the name of the new pad.
	 * direction = the GstPadDirection of the pad.
	 * Throws: ConstructionException GTK+ fails to create the object.
	 */
	public this (string name, GstPadDirection direction)
	{
		// GstPad* gst_pad_new (const gchar *name,  GstPadDirection direction);
		auto p = gst_pad_new(Str.toStringz(name), direction);
		if(p is null)
		{
			throw new ConstructionException("null returned by gst_pad_new(Str.toStringz(name), direction)");
		}
		this(cast(GstPad*) p);
	}
	
	/**
	 * Creates a new pad with the given name from the given template.
	 * If name is NULL, a guaranteed unique name (across all pads)
	 * will be assigned.
	 * This function makes a copy of the name so you can safely free the name.
	 * Params:
	 * templ = the pad template to use
	 * name = the name of the element
	 * Throws: ConstructionException GTK+ fails to create the object.
	 */
	public this (PadTemplate templ, string name)
	{
		// GstPad* gst_pad_new_from_template (GstPadTemplate *templ,  const gchar *name);
		auto p = gst_pad_new_from_template((templ is null) ? null : templ.getPadTemplateStruct(), Str.toStringz(name));
		if(p is null)
		{
			throw new ConstructionException("null returned by gst_pad_new_from_template((templ is null) ? null : templ.getPadTemplateStruct(), Str.toStringz(name))");
		}
		this(cast(GstPad*) p);
	}
	
	/**
	 * Creates a new pad with the given name from the given static template.
	 * If name is NULL, a guaranteed unique name (across all pads)
	 * will be assigned.
	 * This function makes a copy of the name so you can safely free the name.
	 * Params:
	 * templ = the GstStaticPadTemplate to use
	 * name = the name of the element
	 * Throws: ConstructionException GTK+ fails to create the object.
	 */
	public this (GstStaticPadTemplate* templ, string name)
	{
		// GstPad* gst_pad_new_from_static_template (GstStaticPadTemplate *templ,  const gchar *name);
		auto p = gst_pad_new_from_static_template(templ, Str.toStringz(name));
		if(p is null)
		{
			throw new ConstructionException("null returned by gst_pad_new_from_static_template(templ, Str.toStringz(name))");
		}
		this(cast(GstPad*) p);
	}
	
	/**
	 * Allocates a new, empty buffer optimized to push to pad pad. This
	 * function only works if pad is a source pad and has a peer.
	 * A new, empty GstBuffer will be put in the buf argument.
	 * You need to check the caps of the buffer after performing this
	 * function and renegotiate to the format if needed.
	 * Params:
	 * offset = the offset of the new buffer in the stream
	 * size = the size of the new buffer
	 * caps = the caps of the new buffer
	 * buf = a newly allocated buffer
	 * Returns: a result code indicating success of the operation. Any result code other than GST_FLOW_OK is an error and buf should not be used. An error can occur if the pad is not connected or when the downstream peer elements cannot provide an acceptable buffer. MT safe.
	 */
	public GstFlowReturn allocBuffer(ulong offset, int size, Caps caps, out Buffer buf)
	{
		// GstFlowReturn gst_pad_alloc_buffer (GstPad *pad,  guint64 offset,  gint size,  GstCaps *caps,  GstBuffer **buf);
		GstBuffer* outbuf = null;
		
		auto p = gst_pad_alloc_buffer(gstPad, offset, size, (caps is null) ? null : caps.getCapsStruct(), &outbuf);
		
		buf = ObjectG.getDObject!(Buffer)(outbuf);
		return p;
	}
	
	/**
	 * In addition to the function gst_pad_alloc_buffer(), this function
	 * automatically calls gst_pad_set_caps() when the caps of the
	 * newly allocated buffer are different from the pad caps.
	 * Params:
	 * offset = the offset of the new buffer in the stream
	 * size = the size of the new buffer
	 * caps = the caps of the new buffer
	 * buf = a newly allocated buffer
	 * Returns: a result code indicating success of the operation. Any result code other than GST_FLOW_OK is an error and buf should not be used. An error can occur if the pad is not connected or when the downstream peer elements cannot provide an acceptable buffer. MT safe.
	 */
	public GstFlowReturn allocBufferAndSetCaps(ulong offset, int size, Caps caps, out Buffer buf)
	{
		// GstFlowReturn gst_pad_alloc_buffer_and_set_caps (GstPad *pad,  guint64 offset,  gint size,  GstCaps *caps,  GstBuffer **buf);
		GstBuffer* outbuf = null;
		
		auto p = gst_pad_alloc_buffer_and_set_caps(gstPad, offset, size, (caps is null) ? null : caps.getCapsStruct(), &outbuf);
		
		buf = ObjectG.getDObject!(Buffer)(outbuf);
		return p;
	}
	
	/**
	 * Sets the given bufferalloc function for the pad. Note that the
	 * bufferalloc function can only be set on sinkpads.
	 * Params:
	 * bufalloc = the GstPadBufferAllocFunction to set.
	 */
	public void setBufferallocFunction(GstPadBufferAllocFunction bufalloc)
	{
		// void gst_pad_set_bufferalloc_function (GstPad *pad,  GstPadBufferAllocFunction bufalloc);
		gst_pad_set_bufferalloc_function(gstPad, bufalloc);
	}
	
	/**
	 * Sets the given chain function for the pad. The chain function is called to
	 * process a GstBuffer input buffer. see GstPadChainFunction for more details.
	 * Params:
	 * chain = the GstPadChainFunction to set.
	 */
	public void setChainFunction(GstPadChainFunction chain)
	{
		// void gst_pad_set_chain_function (GstPad *pad,  GstPadChainFunction chain);
		gst_pad_set_chain_function(gstPad, chain);
	}
	
	/**
	 * Sets the given checkgetrange function for the pad. Implement this function
	 * on a pad if you dynamically support getrange based scheduling on the pad.
	 * Params:
	 * check = the GstPadCheckGetRangeFunction to set.
	 */
	public void setCheckgetrangeFunction(GstPadCheckGetRangeFunction check)
	{
		// void gst_pad_set_checkgetrange_function (GstPad *pad,  GstPadCheckGetRangeFunction check);
		gst_pad_set_checkgetrange_function(gstPad, check);
	}
	
	/**
	 * When pad is flushing this function returns GST_FLOW_WRONG_STATE
	 * immediatly.
	 * Calls the getrange function of pad, see GstPadGetRangeFunction for a
	 * description of a getrange function. If pad has no getrange function
	 * installed (see gst_pad_set_getrange_function()) this function returns
	 * GST_FLOW_NOT_SUPPORTED.
	 * buffer's caps must either be unset or the same as what is already
	 * configured on pad. Renegotiation within a running pull-mode pipeline is not
	 * supported.
	 * This is a lowlevel function. Usualy gst_pad_pull_range() is used.
	 * Params:
	 * offset = The start offset of the buffer
	 * size = The length of the buffer
	 * buffer = a pointer to hold the GstBuffer, returns GST_FLOW_ERROR if NULL.
	 * Returns: a GstFlowReturn from the pad. MT safe.
	 */
	public GstFlowReturn getRange(ulong offset, uint size, ref Buffer buffer)
	{
		// GstFlowReturn gst_pad_get_range (GstPad *pad,  guint64 offset,  guint size,  GstBuffer **buffer);
		GstBuffer* outbuffer = (buffer is null) ? null : buffer.getBufferStruct();
		
		auto p = gst_pad_get_range(gstPad, offset, size, &outbuffer);
		
		buffer = ObjectG.getDObject!(Buffer)(outbuffer);
		return p;
	}
	
	/**
	 * Sets the given getrange function for the pad. The getrange function is
	 * called to produce a new GstBuffer to start the processing pipeline. see
	 * GstPadGetRangeFunction for a description of the getrange function.
	 * Params:
	 * get = the GstPadGetRangeFunction to set.
	 */
	public void setGetrangeFunction(GstPadGetRangeFunction get)
	{
		// void gst_pad_set_getrange_function (GstPad *pad,  GstPadGetRangeFunction get);
		gst_pad_set_getrange_function(gstPad, get);
	}
	
	/**
	 * Sets the given event handler for the pad.
	 * Params:
	 * event = the GstPadEventFunction to set.
	 */
	public void setEventFunction(GstPadEventFunction event)
	{
		// void gst_pad_set_event_function (GstPad *pad,  GstPadEventFunction event);
		gst_pad_set_event_function(gstPad, event);
	}
	
	/**
	 * Sets the given link function for the pad. It will be called when
	 * the pad is linked with another pad.
	 * The return value GST_PAD_LINK_OK should be used when the connection can be
	 * made.
	 * The return value GST_PAD_LINK_REFUSED should be used when the connection
	 * cannot be made for some reason.
	 * If link is installed on a source pad, it should call the GstPadLinkFunction
	 * of the peer sink pad, if present.
	 * Params:
	 * link = the GstPadLinkFunction to set.
	 */
	public void setLinkFunction(GstPadLinkFunction link)
	{
		// void gst_pad_set_link_function (GstPad *pad,  GstPadLinkFunction link);
		gst_pad_set_link_function(gstPad, link);
	}
	
	/**
	 * Sets the given unlink function for the pad. It will be called
	 * when the pad is unlinked.
	 * Params:
	 * unlink = the GstPadUnlinkFunction to set.
	 */
	public void setUnlinkFunction(GstPadUnlinkFunction unlink)
	{
		// void gst_pad_set_unlink_function (GstPad *pad,  GstPadUnlinkFunction unlink);
		gst_pad_set_unlink_function(gstPad, unlink);
	}
	
	/**
	 * Check if the given pad accepts the caps.
	 * Params:
	 * caps = a GstCaps to check on the pad
	 * Returns: TRUE if the pad can accept the caps.
	 */
	public int acceptCaps(Caps caps)
	{
		// gboolean gst_pad_accept_caps (GstPad *pad,  GstCaps *caps);
		return gst_pad_accept_caps(gstPad, (caps is null) ? null : caps.getCapsStruct());
	}
	
	/**
	 * Sets the given acceptcaps function for the pad. The acceptcaps function
	 * will be called to check if the pad can accept the given caps. Setting the
	 * acceptcaps function to NULL restores the default behaviour of allowing
	 * any caps that matches the caps from gst_pad_get_caps.
	 * Params:
	 * acceptcaps = the GstPadAcceptCapsFunction to set.
	 */
	public void setAcceptcapsFunction(GstPadAcceptCapsFunction acceptcaps)
	{
		// void gst_pad_set_acceptcaps_function (GstPad *pad,  GstPadAcceptCapsFunction acceptcaps);
		gst_pad_set_acceptcaps_function(gstPad, acceptcaps);
	}
	
	/**
	 * Sets the given getcaps function for the pad. getcaps should return the
	 * allowable caps for a pad in the context of the element's state, its link to
	 * other elements, and the devices or files it has opened. These caps must be a
	 * subset of the pad template caps. In the NULL state with no links, getcaps
	 * should ideally return the same caps as the pad template. In rare
	 * circumstances, an object property can affect the caps returned by getcaps,
	 * but this is discouraged.
	 * You do not need to call this function if pad's allowed caps are always the
	 * same as the pad template caps. This can only be true if the padtemplate
	 * has fixed simple caps.
	 * For most filters, the caps returned by getcaps is directly affected by the
	 * allowed caps on other pads. For demuxers and decoders, the caps returned by
	 * the srcpad's getcaps function is directly related to the stream data. Again,
	 * getcaps should return the most specific caps it reasonably can, since this
	 * helps with autoplugging.
	 * Note that the return value from getcaps is owned by the caller, so the
	 * caller should unref the caps after usage.
	 * Params:
	 * getcaps = the GstPadGetCapsFunction to set.
	 */
	public void setGetcapsFunction(GstPadGetCapsFunction getcaps)
	{
		// void gst_pad_set_getcaps_function (GstPad *pad,  GstPadGetCapsFunction getcaps);
		gst_pad_set_getcaps_function(gstPad, getcaps);
	}
	
	/**
	 * Calls gst_pad_get_allowed_caps() for every other pad belonging to the
	 * same element as pad, and returns the intersection of the results.
	 * This function is useful as a default getcaps function for an element
	 * that can handle any stream format, but requires all its pads to have
	 * the same caps. Two such elements are tee and aggregator.
	 * Returns: the intersection of the other pads' allowed caps.
	 */
	public Caps proxyGetcaps()
	{
		// GstCaps* gst_pad_proxy_getcaps (GstPad *pad);
		auto p = gst_pad_proxy_getcaps(gstPad);
		
		if(p is null)
		{
			return null;
		}
		
		return ObjectG.getDObject!(Caps)(cast(GstCaps*) p);
	}
	
	/**
	 * Sets the given setcaps function for the pad. The setcaps function
	 * will be called whenever a buffer with a new media type is pushed or
	 * pulled from the pad. The pad/element needs to update its internal
	 * structures to process the new media type. If this new type is not
	 * acceptable, the setcaps function should return FALSE.
	 * Params:
	 * setcaps = the GstPadSetCapsFunction to set.
	 */
	public void setSetcapsFunction(GstPadSetCapsFunction setcaps)
	{
		// void gst_pad_set_setcaps_function (GstPad *pad,  GstPadSetCapsFunction setcaps);
		gst_pad_set_setcaps_function(gstPad, setcaps);
	}
	
	/**
	 * Calls gst_pad_set_caps() for every other pad belonging to the
	 * same element as pad. If gst_pad_set_caps() fails on any pad,
	 * the proxy setcaps fails. May be used only during negotiation.
	 * Params:
	 * caps = the GstCaps to link with
	 * Returns: TRUE if sucessful
	 */
	public int proxySetcaps(Caps caps)
	{
		// gboolean gst_pad_proxy_setcaps (GstPad *pad,  GstCaps *caps);
		return gst_pad_proxy_setcaps(gstPad, (caps is null) ? null : caps.getCapsStruct());
	}
	
	/**
	 * Fixate a caps on the given pad. Modifies the caps in place, so you should
	 * make sure that the caps are actually writable (see gst_caps_make_writable()).
	 * Params:
	 * caps = the GstCaps to fixate
	 */
	public void fixateCaps(Caps caps)
	{
		// void gst_pad_fixate_caps (GstPad *pad,  GstCaps *caps);
		gst_pad_fixate_caps(gstPad, (caps is null) ? null : caps.getCapsStruct());
	}
	
	/**
	 * Sets the given fixatecaps function for the pad. The fixatecaps function
	 * will be called whenever the default values for a GstCaps needs to be
	 * filled in.
	 * Params:
	 * fixatecaps = the GstPadFixateCapsFunction to set.
	 */
	public void setFixatecapsFunction(GstPadFixateCapsFunction fixatecaps)
	{
		// void gst_pad_set_fixatecaps_function (GstPad *pad,  GstPadFixateCapsFunction fixatecaps);
		gst_pad_set_fixatecaps_function(gstPad, fixatecaps);
	}
	
	/**
	 * A helper function you can use as a GetCaps function that
	 * will return the currently negotiated caps or the padtemplate
	 * when NULL.
	 * Returns: The currently negotiated caps or the padtemplate.
	 */
	public Caps getFixedCapsFunc()
	{
		// GstCaps* gst_pad_get_fixed_caps_func (GstPad *pad);
		auto p = gst_pad_get_fixed_caps_func(gstPad);
		
		if(p is null)
		{
			return null;
		}
		
		return ObjectG.getDObject!(Caps)(cast(GstCaps*) p);
	}
	
	/**
	 * Check if the peer of pad accepts caps. If pad has no peer, this function
	 * returns TRUE.
	 * Params:
	 * caps = a GstCaps to check on the pad
	 * Returns: TRUE if the peer of pad can accept the caps or pad has no peer.
	 */
	public int peerAcceptCaps(Caps caps)
	{
		// gboolean gst_pad_peer_accept_caps (GstPad *pad,  GstCaps *caps);
		return gst_pad_peer_accept_caps(gstPad, (caps is null) ? null : caps.getCapsStruct());
	}
	
	/**
	 * Sets the given activate function for pad. The activate function will
	 * dispatch to gst_pad_activate_push() or gst_pad_activate_pull() to perform
	 * the actual activation. Only makes sense to set on sink pads.
	 * Call this function if your sink pad can start a pull-based task.
	 * Params:
	 * activate = the GstPadActivateFunction to set.
	 */
	public void setActivateFunction(GstPadActivateFunction activate)
	{
		// void gst_pad_set_activate_function (GstPad *pad,  GstPadActivateFunction activate);
		gst_pad_set_activate_function(gstPad, activate);
	}
	
	/**
	 * Sets the given activate_push function for the pad. An activate_push function
	 * prepares the element for pushing. See XXX part-activation.txt for details.
	 * Params:
	 * activatepush = the GstPadActivateModeFunction to set.
	 */
	public void setActivatepushFunction(GstPadActivateModeFunction activatepush)
	{
		// void gst_pad_set_activatepush_function (GstPad *pad,  GstPadActivateModeFunction activatepush);
		gst_pad_set_activatepush_function(gstPad, activatepush);
	}
	
	/**
	 * Sets the given activate_pull function for the pad. An activate_pull function
	 * prepares the element and any upstream connections for pulling. See XXX
	 * part-activation.txt for details.
	 * Params:
	 * activatepull = the GstPadActivateModeFunction to set.
	 */
	public void setActivatepullFunction(GstPadActivateModeFunction activatepull)
	{
		// void gst_pad_set_activatepull_function (GstPad *pad,  GstPadActivateModeFunction activatepull);
		gst_pad_set_activatepull_function(gstPad, activatepull);
	}
	
	/**
	 * Pushes a buffer to the peer of pad.
	 * This function will call an installed pad block before triggering any
	 * installed pad probes.
	 * If the caps on buffer are different from the currently configured caps on
	 * pad, this function will call any installed setcaps function on pad (see
	 * gst_pad_set_setcaps_function()). In case of failure to renegotiate the new
	 * format, this function returns GST_FLOW_NOT_NEGOTIATED.
	 * The function proceeds calling gst_pad_chain() on the peer pad and returns
	 * the value from that function. If pad has no peer, GST_FLOW_NOT_LINKED will
	 * be returned.
	 * In all cases, success or failure, the caller loses its reference to buffer
	 * after calling this function.
	 * Params:
	 * buffer = the GstBuffer to push returns GST_FLOW_ERROR if not.
	 * Returns: a GstFlowReturn from the peer pad. MT safe.
	 */
	public GstFlowReturn push(Buffer buffer)
	{
		// GstFlowReturn gst_pad_push (GstPad *pad,  GstBuffer *buffer);
		return gst_pad_push(gstPad, (buffer is null) ? null : buffer.getBufferStruct());
	}
	
	/**
	 * Sends the event to the peer of the given pad. This function is
	 * mainly used by elements to send events to their peer
	 * elements.
	 * This function takes owership of the provided event so you should
	 * gst_event_ref() it if you want to reuse the event after this call.
	 * Params:
	 * event = the GstEvent to send to the pad.
	 * Returns: TRUE if the event was handled. MT safe.
	 */
	public int pushEvent(Event event)
	{
		// gboolean gst_pad_push_event (GstPad *pad,  GstEvent *event);
		return gst_pad_push_event(gstPad, (event is null) ? null : event.getEventStruct());
	}
	
	/**
	 * Checks if a gst_pad_pull_range() can be performed on the peer
	 * source pad. This function is used by plugins that want to check
	 * if they can use random access on the peer source pad.
	 * The peer sourcepad can implement a custom GstPadCheckGetRangeFunction
	 * if it needs to perform some logic to determine if pull_range is
	 * possible.
	 * Returns: a gboolean with the result. MT safe.
	 */
	public int checkPullRange()
	{
		// gboolean gst_pad_check_pull_range (GstPad *pad);
		return gst_pad_check_pull_range(gstPad);
	}
	
	/**
	 * Pulls a buffer from the peer pad.
	 * This function will first trigger the pad block signal if it was
	 * installed.
	 * When pad is not linked GST_FLOW_NOT_LINKED is returned else this
	 * function returns the result of gst_pad_get_range() on the peer pad.
	 * See gst_pad_get_range() for a list of return values and for the
	 * semantics of the arguments of this function.
	 * buffer's caps must either be unset or the same as what is already
	 * configured on pad. Renegotiation within a running pull-mode pipeline is not
	 * supported.
	 * Params:
	 * offset = The start offset of the buffer
	 * size = The length of the buffer
	 * buffer = a pointer to hold the GstBuffer, returns GST_FLOW_ERROR if NULL.
	 * Returns: a GstFlowReturn from the peer pad. When this function returns GST_FLOW_OK, buffer will contain a valid GstBuffer that should be freed with gst_buffer_unref() after usage. buffer may not be used or freed when any other return value than GST_FLOW_OK is returned. MT safe.
	 */
	public GstFlowReturn pullRange(ulong offset, uint size, ref Buffer buffer)
	{
		// GstFlowReturn gst_pad_pull_range (GstPad *pad,  guint64 offset,  guint size,  GstBuffer **buffer);
		GstBuffer* outbuffer = (buffer is null) ? null : buffer.getBufferStruct();
		
		auto p = gst_pad_pull_range(gstPad, offset, size, &outbuffer);
		
		buffer = ObjectG.getDObject!(Buffer)(outbuffer);
		return p;
	}
	
	/**
	 * Activates or deactivates the given pad in pull mode via dispatching to the
	 * pad's activatepullfunc. For use from within pad activation functions only.
	 * When called on sink pads, will first proxy the call to the peer pad, which
	 * is expected to activate its internally linked pads from within its
	 * activate_pull function.
	 * If you don't know what this is, you probably don't want to call it.
	 * Params:
	 * active = whether or not the pad should be active.
	 * Returns: TRUE if the operation was successful. MT safe.
	 */
	public int activatePull(int active)
	{
		// gboolean gst_pad_activate_pull (GstPad *pad,  gboolean active);
		return gst_pad_activate_pull(gstPad, active);
	}
	
	/**
	 * Activates or deactivates the given pad in push mode via dispatching to the
	 * pad's activatepushfunc. For use from within pad activation functions only.
	 * If you don't know what this is, you probably don't want to call it.
	 * Params:
	 * active = whether the pad should be active or not.
	 * Returns: TRUE if the operation was successful. MT safe.
	 */
	public int activatePush(int active)
	{
		// gboolean gst_pad_activate_push (GstPad *pad,  gboolean active);
		return gst_pad_activate_push(gstPad, active);
	}
	
	/**
	 * Sends the event to the pad. This function can be used
	 * by applications to send events in the pipeline.
	 * If pad is a source pad, event should be an upstream event. If pad is a
	 * sink pad, event should be a downstream event. For example, you would not
	 * send a GST_EVENT_EOS on a src pad; EOS events only propagate downstream.
	 * Furthermore, some downstream events have to be serialized with data flow,
	 * like EOS, while some can travel out-of-band, like GST_EVENT_FLUSH_START. If
	 * the event needs to be serialized with data flow, this function will take the
	 * pad's stream lock while calling its event function.
	 * To find out whether an event type is upstream, downstream, or downstream and
	 * serialized, see GstEventTypeFlags, gst_event_type_get_flags(),
	 * GST_EVENT_IS_UPSTREAM, GST_EVENT_IS_DOWNSTREAM, and
	 * GST_EVENT_IS_SERIALIZED. Note that in practice that an application or
	 * plugin doesn't need to bother itself with this information; the core handles
	 * all necessary locks and checks.
	 * This function takes owership of the provided event so you should
	 * gst_event_ref() it if you want to reuse the event after this call.
	 * Params:
	 * event = the GstEvent to send to the pad.
	 * Returns: TRUE if the event was handled.
	 */
	public int sendEvent(Event event)
	{
		// gboolean gst_pad_send_event (GstPad *pad,  GstEvent *event);
		return gst_pad_send_event(gstPad, (event is null) ? null : event.getEventStruct());
	}
	
	/**
	 * Invokes the default event handler for the given pad. End-of-stream and
	 * discontinuity events are handled specially, and then the event is sent to all
	 * pads internally linked to pad. Note that if there are many possible sink
	 * pads that are internally linked to pad, only one will be sent an event.
	 * Multi-sinkpad elements should implement custom event handlers.
	 * Params:
	 * event = the GstEvent to handle.
	 * Returns: TRUE if the event was sent succesfully.
	 */
	public int eventDefault(Event event)
	{
		// gboolean gst_pad_event_default (GstPad *pad,  GstEvent *event);
		return gst_pad_event_default(gstPad, (event is null) ? null : event.getEventStruct());
	}
	
	/**
	 * Dispatches a query to a pad. The query should have been allocated by the
	 * caller via one of the type-specific allocation functions in gstquery.h. The
	 * element is responsible for filling the query with an appropriate response,
	 * which should then be parsed with a type-specific query parsing function.
	 * Again, the caller is responsible for both the allocation and deallocation of
	 * the query structure.
	 * Params:
	 * query = the GstQuery to perform.
	 * Returns: TRUE if the query could be performed.
	 */
	public int query(Query query)
	{
		// gboolean gst_pad_query (GstPad *pad,  GstQuery *query);
		return gst_pad_query(gstPad, (query is null) ? null : query.getQueryStruct());
	}
	
	/**
	 * Invokes the default query handler for the given pad.
	 * The query is sent to all pads internally linked to pad. Note that
	 * if there are many possible sink pads that are internally linked to
	 * pad, only one will be sent the query.
	 * Multi-sinkpad elements should implement custom query handlers.
	 * Params:
	 * query = the GstQuery to handle.
	 * Returns: TRUE if the query was performed succesfully.
	 */
	public int queryDefault(Query query)
	{
		// gboolean gst_pad_query_default (GstPad *pad,  GstQuery *query);
		return gst_pad_query_default(gstPad, (query is null) ? null : query.getQueryStruct());
	}
	
	/**
	 * Queries a pad for the stream position.
	 * Params:
	 * format = a pointer to the GstFormat asked for.
	 *  On return contains the GstFormat used.
	 * cur = A location in which to store the current position, or NULL.
	 * Returns: TRUE if the query could be performed.
	 */
	public int queryPosition(ref GstFormat format, out long cur)
	{
		// gboolean gst_pad_query_position (GstPad *pad,  GstFormat *format,  gint64 *cur);
		return gst_pad_query_position(gstPad, &format, &cur);
	}
	
	/**
	 * Queries a pad for the total stream duration.
	 * Params:
	 * format = a pointer to the GstFormat asked for.
	 *  On return contains the GstFormat used.
	 * duration = A location in which to store the total duration, or NULL.
	 * Returns: TRUE if the query could be performed.
	 */
	public int queryDuration(ref GstFormat format, out long duration)
	{
		// gboolean gst_pad_query_duration (GstPad *pad,  GstFormat *format,  gint64 *duration);
		return gst_pad_query_duration(gstPad, &format, &duration);
	}
	
	/**
	 * Queries a pad to convert src_val in src_format to dest_format.
	 * Params:
	 * srcFormat = a GstFormat to convert from.
	 * srcVal = a value to convert.
	 * destFormat = a pointer to the GstFormat to convert to.
	 * destVal = a pointer to the result.
	 * Returns: TRUE if the query could be performed.
	 */
	public int queryConvert(GstFormat srcFormat, long srcVal, ref GstFormat destFormat, out long destVal)
	{
		// gboolean gst_pad_query_convert (GstPad *pad,  GstFormat src_format,  gint64 src_val,  GstFormat *dest_format,  gint64 *dest_val);
		return gst_pad_query_convert(gstPad, srcFormat, srcVal, &destFormat, &destVal);
	}
	
	/**
	 * Queries the peer of a given sink pad for the stream position.
	 * Params:
	 * format = a pointer to the GstFormat asked for.
	 *  On return contains the GstFormat used.
	 * cur = A location in which to store the current position, or NULL.
	 * Returns: TRUE if the query could be performed.
	 */
	public int queryPeerPosition(ref GstFormat format, out long cur)
	{
		// gboolean gst_pad_query_peer_position (GstPad *pad,  GstFormat *format,  gint64 *cur);
		return gst_pad_query_peer_position(gstPad, &format, &cur);
	}
	
	/**
	 * Queries the peer pad of a given sink pad for the total stream duration.
	 * Params:
	 * format = a pointer to the GstFormat asked for.
	 *  On return contains the GstFormat used.
	 * duration = A location in which to store the total duration, or NULL.
	 * Returns: TRUE if the query could be performed.
	 */
	public int queryPeerDuration(ref GstFormat format, out long duration)
	{
		// gboolean gst_pad_query_peer_duration (GstPad *pad,  GstFormat *format,  gint64 *duration);
		return gst_pad_query_peer_duration(gstPad, &format, &duration);
	}
	
	/**
	 * Queries the peer pad of a given sink pad to convert src_val in src_format
	 * to dest_format.
	 * Params:
	 * srcFormat = a GstFormat to convert from.
	 * srcVal = a value to convert.
	 * destFormat = a pointer to the GstFormat to convert to.
	 * destVal = a pointer to the result.
	 * Returns: TRUE if the query could be performed.
	 */
	public int queryPeerConvert(GstFormat srcFormat, long srcVal, ref GstFormat destFormat, out long destVal)
	{
		// gboolean gst_pad_query_peer_convert (GstPad *pad,  GstFormat src_format,  gint64 src_val,  GstFormat *dest_format,  gint64 *dest_val);
		return gst_pad_query_peer_convert(gstPad, srcFormat, srcVal, &destFormat, &destVal);
	}
	
	/**
	 * Set the given query function for the pad.
	 * Params:
	 * query = the GstPadQueryFunction to set.
	 */
	public void setQueryFunction(GstPadQueryFunction query)
	{
		// void gst_pad_set_query_function (GstPad *pad,  GstPadQueryFunction query);
		gst_pad_set_query_function(gstPad, query);
	}
	
	/**
	 * Set the given query type function for the pad.
	 * Params:
	 * typeFunc = the GstPadQueryTypeFunction to set.
	 */
	public void setQueryTypeFunction(GstPadQueryTypeFunction typeFunc)
	{
		// void gst_pad_set_query_type_function (GstPad *pad,  GstPadQueryTypeFunction type_func);
		gst_pad_set_query_type_function(gstPad, typeFunc);
	}
	
	/**
	 * Get an array of supported queries that can be performed
	 * on this pad.
	 * Returns: a zero-terminated array of GstQueryType.
	 */
	public GstQueryType* getQueryTypes()
	{
		// const GstQueryType* gst_pad_get_query_types (GstPad *pad);
		return gst_pad_get_query_types(gstPad);
	}
	
	/**
	 * Invoke the default dispatcher for the query types on
	 * the pad.
	 * Returns: an zero-terminated array of GstQueryType, or NULL if none of the internally-linked pads has a query types function.
	 */
	public GstQueryType* getQueryTypesDefault()
	{
		// const GstQueryType* gst_pad_get_query_types_default (GstPad *pad);
		return gst_pad_get_query_types_default(gstPad);
	}
	
	/**
	 * Sets the given internal link function for the pad.
	 * Params:
	 * intlink = the GstPadIntLinkFunction to set.
	 */
	public void setInternalLinkFunction(GstPadIntLinkFunction intlink)
	{
		// void gst_pad_set_internal_link_function (GstPad *pad,  GstPadIntLinkFunction intlink);
		gst_pad_set_internal_link_function(gstPad, intlink);
	}
	
	/**
	 * Gets a list of pads to which the given pad is linked to
	 * inside of the parent element.
	 * The caller must free this list after use.
	 * Returns: a newly allocated GList of pads. Not MT safe.
	 */
	public ListG getInternalLinks()
	{
		// GList* gst_pad_get_internal_links (GstPad *pad);
		auto p = gst_pad_get_internal_links(gstPad);
		
		if(p is null)
		{
			return null;
		}
		
		return ObjectG.getDObject!(ListG)(cast(GList*) p);
	}
	
	/**
	 * Gets a list of pads to which the given pad is linked to
	 * inside of the parent element.
	 * This is the default handler, and thus returns a list of all of the
	 * pads inside the parent element with opposite direction.
	 * The caller must free this list after use.
	 * Returns: a newly allocated GList of pads, or NULL if the pad has no parent. Not MT safe.
	 */
	public ListG getInternalLinksDefault()
	{
		// GList* gst_pad_get_internal_links_default (GstPad *pad);
		auto p = gst_pad_get_internal_links_default(gstPad);
		
		if(p is null)
		{
			return null;
		}
		
		return ObjectG.getDObject!(ListG)(cast(GList*) p);
	}
	
	/**
	 * Invokes the given dispatcher function on each respective peer of
	 * all pads that are internally linked to the given pad.
	 * The GstPadDispatcherFunction should return TRUE when no further pads
	 * need to be processed.
	 * Params:
	 * dispatch = the GstDispatcherFunction to call.
	 * data = gpointer user data passed to the dispatcher function.
	 * Returns: TRUE if one of the dispatcher functions returned TRUE.
	 */
	public int dispatcher(GstPadDispatcherFunction dispatch, void* data)
	{
		// gboolean gst_pad_dispatcher (GstPad *pad,  GstPadDispatcherFunction dispatch,  gpointer data);
		return gst_pad_dispatcher(gstPad, dispatch, data);
	}
	
	/**
	 * Set the given private data gpointer on the pad.
	 * This function can only be used by the element that owns the pad.
	 * No locking is performed in this function.
	 * Params:
	 * priv = The private data to attach to the pad.
	 */
	public void setElementPrivate(void* priv)
	{
		// void gst_pad_set_element_private (GstPad *pad,  gpointer priv);
		gst_pad_set_element_private(gstPad, priv);
	}
	
	/**
	 * Gets the private data of a pad.
	 * No locking is performed in this function.
	 * Returns: a gpointer to the private data.
	 */
	public void* getElementPrivate()
	{
		// gpointer gst_pad_get_element_private (GstPad *pad);
		return gst_pad_get_element_private(gstPad);
	}
	
	/**
	 * Chain a buffer to pad.
	 * The function returns GST_FLOW_WRONG_STATE if the pad was flushing.
	 * If the caps on buffer are different from the current caps on pad, this
	 * function will call any setcaps function (see gst_pad_set_setcaps_function())
	 * installed on pad. If the new caps are not acceptable for pad, this
	 * function returns GST_FLOW_NOT_NEGOTIATED.
	 * The function proceeds calling the chain function installed on pad (see
	 * gst_pad_set_chain_function()) and the return value of that function is
	 * returned to the caller. GST_FLOW_NOT_SUPPORTED is returned if pad has no
	 * chain function.
	 * In all cases, success or failure, the caller loses its reference to buffer
	 * after calling this function.
	 * Params:
	 * buffer = the GstBuffer to send, return GST_FLOW_ERROR if not.
	 * Returns: a GstFlowReturn from the pad. MT safe.
	 */
	public GstFlowReturn chain(Buffer buffer)
	{
		// GstFlowReturn gst_pad_chain (GstPad *pad,  GstBuffer *buffer);
		return gst_pad_chain(gstPad, (buffer is null) ? null : buffer.getBufferStruct());
	}
	
	/**
	 * Starts a task that repeatedly calls func with data. This function
	 * is mostly used in pad activation functions to start the dataflow.
	 * The GST_PAD_STREAM_LOCK of pad will automatically be acquired
	 * before func is called.
	 * Params:
	 * func = the task function to call
	 * data = data passed to the task function
	 * Returns: a TRUE if the task could be started.
	 */
	public int startTask(GstTaskFunction func, void* data)
	{
		// gboolean gst_pad_start_task (GstPad *pad,  GstTaskFunction func,  gpointer data);
		return gst_pad_start_task(gstPad, func, data);
	}
	
	/**
	 * Pause the task of pad. This function will also make sure that the
	 * function executed by the task will effectively stop.
	 * Returns: a TRUE if the task could be paused or FALSE when the pad has no task.
	 */
	public int pauseTask()
	{
		// gboolean gst_pad_pause_task (GstPad *pad);
		return gst_pad_pause_task(gstPad);
	}
	
	/**
	 * Stop the task of pad. This function will also make sure that the
	 * function executed by the task will effectively stop if not called
	 * from the GstTaskFunction.
	 * This function will deadlock if called from the GstTaskFunction of
	 * the task. Use gst_task_pause() instead.
	 * Regardless of whether the pad has a task, the stream lock is acquired and
	 * released so as to ensure that streaming through this pad has finished.
	 * Returns: a TRUE if the task could be stopped or FALSE on error.
	 */
	public int stopTask()
	{
		// gboolean gst_pad_stop_task (GstPad *pad);
		return gst_pad_stop_task(gstPad);
	}
	
	/**
	 * Activates or deactivates the given pad.
	 * Normally called from within core state change functions.
	 * If active, makes sure the pad is active. If it is already active, either in
	 * push or pull mode, just return. Otherwise dispatches to the pad's activate
	 * function to perform the actual activation.
	 * If not active, checks the pad's current mode and calls
	 * gst_pad_activate_push() or gst_pad_activate_pull(), as appropriate, with a
	 * FALSE argument.
	 * Params:
	 * active = whether or not the pad should be active.
	 * Returns: TRUE if the operation was successful. MT safe.
	 */
	public int setActive(int active)
	{
		// gboolean gst_pad_set_active (GstPad *pad,  gboolean active);
		return gst_pad_set_active(gstPad, active);
	}
}