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[gtkD.git] / gtkD / srcgstreamer / gstreamer / Pad.d

/*
 * 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 2.1 of the License, or
 * (at your option) any later version.
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  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_element_
 *      - gst_
 * omit structs:
 * omit prefixes:
 * omit code:
 *      - gst_pad_load_and_link
 * 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:
 */

module gstreamer.Pad;

version(noAssert)
{
        version(Tango)
        {
                import tango.io.Stdout; // use the tango loging?
        }
}

private import gstreamerc.gstreamertypes;

private import gstreamerc.gstreamer;


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;




/**
 * 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)
 */
private import gstreamer.ObjectGst;
public class Pad : ObjectGst
{
        
        /** the main Gtk struct */
        protected GstPad* gstPad;
        
        
        public GstPad* getPadStruct()
        {
                return gstPad;
        }
        
        
        /** the main Gtk struct as a void* */
        protected void* getStruct()
        {
                return cast(void*)gstPad;
        }
        
        /**
         * Sets our main struct and passes it to the parent class
         */
        public this (GstPad* gstPad)
        {
                version(noAssert)
                {
                        if ( gstPad is null )
                        {
                                int zero = 0;
                                version(Tango)
                                {
                                        Stdout("struct gstPad is null on constructor").newline;
                                }
                                else
                                {
                                        printf("struct gstPad is null on constructor");
                                }
                                zero = zero / zero;
                        }
                }
                else
                {
                        assert(gstPad !is null, "struct gstPad is null on constructor");
                }
                super(cast(GstObject*)gstPad);
                this.gstPad = gstPad;
        }
        
        /**
         * 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;
        }
        
        
        /**
         */
        
        // imports for the signal processing
        private import gobject.Signals;
        private import gtkc.gdktypes;
        int[char[]] connectedSignals;
        
        gboolean delegate(MiniObject, Pad)[] onHaveDataListeners;
        void addOnHaveData(gboolean 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 void callBackHaveData(GstPad* padStruct, GstMiniObject* miniObj, Pad pad)
        {
                bool consumed = false;
                
                foreach ( gboolean delegate(MiniObject, Pad) dlg ; pad.onHaveDataListeners )
                {
                        dlg(new MiniObject(miniObj), pad);
                }
                
                return consumed;
        }
        
        void delegate(Pad, Pad)[] onLinkedListeners;
        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)
        {
                bool consumed = false;
                
                foreach ( void delegate(Pad, Pad) dlg ; pad.onLinkedListeners )
                {
                        dlg(new Pad(peer), pad);
                }
                
                return consumed;
        }
        
        void delegate(Pad)[] onRequestLinkListeners;
        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)
        {
                bool consumed = false;
                
                foreach ( void delegate(Pad) dlg ; pad.onRequestLinkListeners )
                {
                        dlg(pad);
                }
                
                return consumed;
        }
        
        void delegate(Pad, Pad)[] onUnlinkedListeners;
        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)
        {
                bool consumed = false;
                
                foreach ( void delegate(Pad, Pad) dlg ; pad.onUnlinkedListeners )
                {
                        dlg(new Pad(peer), pad);
                }
                
                return consumed;
        }
        
        
        
        
        
        
        
        
        
        
        
        /**
         * Gets the direction of the pad. The direction of the pad is
         * decided at construction time so this function does not take
         * the LOCK.
         * pad:
         *  a GstPad to get the direction of.
         * 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.
         * pad:
         *  a pad
         * 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);
                return new Element( gst_pad_get_parent_element(gstPad) );
        }
        
        /**
         * Gets the template for pad.
         * pad:
         *  a GstPad.
         * 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);
                return new PadTemplate( gst_pad_get_pad_template(gstPad) );
        }
        
        /**
         * Links the source pad and the sink pad.
         * srcpad:
         *  the source GstPad to link.
         * 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.
         * srcpad:
         *  the source GstPad to unlink.
         * 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.
         * pad:
         *  pad to check
         * 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.
         * srcpad:
         *  the source GstPad to link.
         * 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.
         * pad:
         *  a GstPad to get the capabilities of.
         * Returns:
         *  a newly allocated copy of the GstCaps of this pad.
         * MT safe.
         */
        public Caps getCaps()
        {
                // GstCaps* gst_pad_get_caps (GstPad *pad);
                return new Caps( gst_pad_get_caps(gstPad) );
        }
        
        /**
         * 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.
         * pad:
         *  a GstPad.
         * 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);
                return new Caps( gst_pad_get_allowed_caps(gstPad) );
        }
        
        /**
         * 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.
         * pad:
         *  a GstPad.
         * Returns:
         *  the negotiated GstCaps of the pad link. Free 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);
                return new Caps( gst_pad_get_negotiated_caps(gstPad) );
        }
        
        /**
         * Gets the capabilities for pad's template.
         * pad:
         *  a GstPad to get the template capabilities from.
         * 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);
                return new Caps( gst_pad_get_pad_template_caps(gstPad) );
        }
        
        /**
         * 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.
         * pad:
         *  a GstPad to set the capabilities of.
         * 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.
         * pad:
         *  a GstPad to get the peer of.
         * Returns:
         *  the peer GstPad. Unref after usage.
         * MT safe.
         */
        public Pad getPeer()
        {
                // GstPad* gst_pad_get_peer (GstPad *pad);
                return new Pad( gst_pad_get_peer(gstPad) );
        }
        
        /**
         * Gets the capabilities of the peer connected to this pad.
         * pad:
         *  a GstPad to get the peer capabilities of.
         * 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);
                return new Caps( gst_pad_peer_get_caps(gstPad) );
        }
        
        /**
         * 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.
         * pad:
         *  the pad to use
         */
        public void useFixedCaps()
        {
                // void gst_pad_use_fixed_caps (GstPad *pad);
                gst_pad_use_fixed_caps(gstPad);
        }
        
        /**
         * Query if a pad is active
         * pad:
         *  the GstPad to query
         * 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.
         * pad:
         *  the GstPad to block or unblock
         * blocked:
         *  boolean indicating we should block or unblock
         * Returns:
         *  TRUE if the pad could be blocked. This function can fail
         *  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.
         * pad:
         *  the GstPad to block or unblock
         * blocked:
         *  boolean indicating whether the pad should be blocked or unblocked
         * callback:
         *  GstPadBlockCallback that will be called when the
         *  operation succeeds
         * user_data:
         *  user data passed to the callback
         * Returns:
         *  TRUE if the pad could be blocked. This function can fail
         *  if 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()).
         * pad:
         *  the GstPad to query
         * 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.
         * pad:
         *  the GstPad to query
         * 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().
         * pad:
         *  pad to add the data probe handler to
         * handler:
         *  function to call when data is passed over pad
         * data:
         *  data to pass along with the handler
         * Returns:
         *  The handler id.
         */
        public uint 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.
         * pad:
         *  pad to add the buffer probe handler to
         * handler:
         *  function to call when data is passed over pad
         * data:
         *  data to pass along with the handler
         * Returns:
         *  The handler id
         */
        public uint 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.
         * pad:
         *  pad to add the event probe handler to
         * handler:
         *  function to call when data is passed over pad
         * data:
         *  data to pass along with the handler
         * Returns:
         *  The handler id
         */
        public uint 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.
         * pad:
         *  pad to remove the data probe handler from
         * handler_id:
         *  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.
         * pad:
         *  pad to remove the buffer probe handler from
         * handler_id:
         *  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.
         * pad:
         *  pad to remove the event probe handler from
         * handler_id:
         *  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.
         * name:
         *  the name of the new pad.
         * direction:
         *  the GstPadDirection of the pad.
         * Returns:
         *  a new GstPad, or NULL in case of an error.
         * MT safe.
         */
        public this (char[] name, GstPadDirection direction)
        {
                // GstPad* gst_pad_new (const gchar *name,  GstPadDirection direction);
                this(cast(GstPad*)gst_pad_new(Str.toStringz(name), direction) );
        }
        
        /**
         * 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.
         * templ:
         *  the pad template to use
         * name:
         *  the name of the element
         * Returns:
         *  a new GstPad, or NULL in case of an error.
         */
        public this (PadTemplate templ, char[] name)
        {
                // GstPad* gst_pad_new_from_template (GstPadTemplate *templ,  const gchar *name);
                this(cast(GstPad*)gst_pad_new_from_template((templ is null) ? null : templ.getPadTemplateStruct(), Str.toStringz(name)) );
        }
        
        /**
         * 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.
         * templ:
         *  the GstStaticPadTemplate to use
         * name:
         *  the name of the element
         * Returns:
         *  a new GstPad, or NULL in case of an error.
         */
        public this (GstStaticPadTemplate* templ, char[] name)
        {
                // GstPad* gst_pad_new_from_static_template  (GstStaticPadTemplate *templ,  const gchar *name);
                this(cast(GstPad*)gst_pad_new_from_static_template(templ, Str.toStringz(name)) );
        }
        
        /**
         * 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.
         * pad:
         *  a source GstPad
         * 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, GstBuffer** buf)
        {
                // GstFlowReturn gst_pad_alloc_buffer (GstPad *pad,  guint64 offset,  gint size,  GstCaps *caps,  GstBuffer **buf);
                return gst_pad_alloc_buffer(gstPad, offset, size, (caps is null) ? null : caps.getCapsStruct(), buf);
        }
        
        /**
         * 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.
         * pad:
         *  a source GstPad
         * 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, GstBuffer** buf)
        {
                // GstFlowReturn gst_pad_alloc_buffer_and_set_caps  (GstPad *pad,  guint64 offset,  gint size,  GstCaps *caps,  GstBuffer **buf);
                return gst_pad_alloc_buffer_and_set_caps(gstPad, offset, size, (caps is null) ? null : caps.getCapsStruct(), buf);
        }
        
        /**
         * Sets the given bufferalloc function for the pad. Note that the
         * bufferalloc function can only be set on sinkpads.
         * pad:
         *  a sink GstPad.
         * 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.
         * pad:
         *  a sink GstPad.
         * 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.
         * pad:
         *  a source GstPad.
         * 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.
         * pad:
         *  a src GstPad, returns GST_FLOW_ERROR if not.
         * 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, GstBuffer** buffer)
        {
                // GstFlowReturn gst_pad_get_range (GstPad *pad,  guint64 offset,  guint size,  GstBuffer **buffer);
                return gst_pad_get_range(gstPad, offset, size, buffer);
        }
        
        /**
         * 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.
         * pad:
         *  a source GstPad.
         * 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.
         * pad:
         *  a source GstPad.
         * 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.
         * pad:
         *  a GstPad.
         * 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.
         * pad:
         *  a GstPad.
         * 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.
         * pad:
         *  a GstPad to check
         * 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.
         * pad:
         *  a GstPad.
         * 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.
         * pad:
         *  a GstPad.
         * 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.
         * pad:
         *  a GstPad to proxy.
         * Returns:
         *  the intersection of the other pads' allowed caps.
         */
        public Caps proxyGetcaps()
        {
                // GstCaps* gst_pad_proxy_getcaps (GstPad *pad);
                return new Caps( gst_pad_proxy_getcaps(gstPad) );
        }
        
        /**
         * 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.
         * pad:
         *  a GstPad.
         * 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.
         * pad:
         *  a GstPad to proxy from
         * 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()).
         * pad:
         *  a GstPad to fixate
         * 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.
         * pad:
         *  a GstPad.
         * 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.
         * pad:
         *  the pad to use
         * Returns:
         *  The currently negotiated caps or the padtemplate.
         */
        public Caps getFixedCapsFunc()
        {
                // GstCaps* gst_pad_get_fixed_caps_func (GstPad *pad);
                return new Caps( gst_pad_get_fixed_caps_func(gstPad) );
        }
        
        /**
         * Check if the peer of pad accepts caps. If pad has no peer, this function
         * returns TRUE.
         * pad:
         *  a GstPad to check the peer of
         * 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.
         * pad:
         *  a GstPad.
         * 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.
         * pad:
         *  a GstPad.
         * 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.
         * pad:
         *  a GstPad.
         * 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.
         * pad:
         *  a source GstPad, returns GST_FLOW_ERROR if not.
         * 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.
         * pad:
         *  a GstPad to push the event to.
         * 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.
         * pad:
         *  a sink GstPad.
         * 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.
         * pad:
         *  a sink GstPad, returns GST_FLOW_ERROR if not.
         * 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, GstBuffer** buffer)
        {
                // GstFlowReturn gst_pad_pull_range (GstPad *pad,  guint64 offset,  guint size,  GstBuffer **buffer);
                return gst_pad_pull_range(gstPad, offset, size, buffer);
        }
        
        /**
         * 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.
         * pad:
         *  the GstPad to activate or deactivate.
         * 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.
         * pad:
         *  the GstPad to activate or deactivate.
         * 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.
         * pad:
         *  a GstPad to send the event to.
         * 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.
         * pad:
         *  a GstPad to call the default event handler on.
         * 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.
         * pad:
         *  a GstPad to invoke the default query on.
         * 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.
         * pad:
         *  a GstPad to call the default query handler on.
         * 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.
         * pad:
         *  a GstPad to invoke the position query on.
         * 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(GstFormat* format, 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.
         * pad:
         *  a GstPad to invoke the duration query on.
         * 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(GstFormat* format, 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.
         * pad:
         *  a GstPad to invoke the convert query on.
         * src_format:
         *  a GstFormat to convert from.
         * src_val:
         *  a value to convert.
         * dest_format:
         *  a pointer to the GstFormat to convert to.
         * dest_val:
         *  a pointer to the result.
         * Returns:
         *  TRUE if the query could be performed.
         */
        public int queryConvert(GstFormat srcFormat, long srcVal, GstFormat* destFormat, 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.
         * pad:
         *  a GstPad on whose peer to invoke the position query on.
         *  Must be a sink pad.
         * 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(GstFormat* format, 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.
         * pad:
         *  a GstPad on whose peer pad to invoke the duration query on.
         *  Must be a sink pad.
         * 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(GstFormat* format, 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.
         * pad:
         *  a GstPad, on whose peer pad to invoke the convert query on.
         *  Must be a sink pad.
         * src_format:
         *  a GstFormat to convert from.
         * src_val:
         *  a value to convert.
         * dest_format:
         *  a pointer to the GstFormat to convert to.
         * dest_val:
         *  a pointer to the result.
         * Returns:
         *  TRUE if the query could be performed.
         */
        public int queryPeerConvert(GstFormat srcFormat, long srcVal, GstFormat* destFormat, 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.
         * pad:
         *  a GstPad of either direction.
         * 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.
         * pad:
         *  a GstPad of either direction.
         * type_func:
         *  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.
         * pad:
         *  a GstPad.
         * 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.
         * pad:
         *  a GstPad.
         * 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.
         * pad:
         *  a GstPad of either direction.
         * 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.
         * pad:
         *  the GstPad to get the internal links of.
         * Returns:
         *  a newly allocated GList of pads.
         * Not MT safe.
         */
        public ListG getInternalLinks()
        {
                // GList* gst_pad_get_internal_links (GstPad *pad);
                return new ListG( gst_pad_get_internal_links(gstPad) );
        }
        
        /**
         * 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.
         * pad:
         *  the GstPad to get the internal links of.
         * 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);
                return new ListG( gst_pad_get_internal_links_default(gstPad) );
        }
        
        
        /**
         * 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.
         * pad:
         *  a GstPad to dispatch.
         * 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.
         * pad:
         *  the GstPad to set the private data of.
         * 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.
         * pad:
         *  the GstPad to get the private data of.
         * 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.
         * pad:
         *  a sink GstPad, returns GST_FLOW_ERROR if not.
         * 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.
         * pad:
         *  the GstPad to start the task of
         * 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.
         * pad:
         *  the GstPad to pause the task of
         * 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.
         * pad:
         *  the GstPad to stop the task of
         * 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.
         * pad:
         *  the GstPad to activate or deactivate.
         * 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);
        }
        
        
        
        
        
        
        
        
        
        
        
        
        
}