mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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2532399423
Original commit message from CVS: fixes bug http://bugzilla.gnome.org/show_bug.cgi?id=90332
513 lines
20 KiB
C
513 lines
20 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wim.taymans@chello.be>
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*
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* gstpad.h: Header for GstPad object
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __GST_PAD_H__
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#define __GST_PAD_H__
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#include <gst/gstconfig.h>
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#include <gst/gstobject.h>
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#include <gst/gstbuffer.h>
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#include <gst/gstcaps.h>
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#include <gst/gstevent.h>
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G_BEGIN_DECLS
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extern GType _gst_pad_type;
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extern GType _gst_real_pad_type;
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extern GType _gst_ghost_pad_type;
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#define GST_TYPE_PARANOID
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/*
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* Pad base class
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*/
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#define GST_TYPE_PAD (_gst_pad_type)
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#define GST_PAD_CAST(obj) ((GstPad*)(obj))
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#define GST_PAD_CLASS_CAST(klass) ((GstPadClass*)(klass))
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#define GST_IS_PAD(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_PAD))
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#define GST_IS_PAD_FAST(obj) (G_OBJECT_TYPE(obj) == GST_TYPE_REAL_PAD || \
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G_OBJECT_TYPE(obj) == GST_TYPE_GHOST_PAD)
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#define GST_IS_PAD_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_PAD))
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#ifdef GST_TYPE_PARANOID
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# define GST_PAD(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_PAD, GstPad))
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# define GST_PAD_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_PAD, GstPadClass))
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#else
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# define GST_PAD GST_PAD_CAST
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# define GST_PAD_CLASS GST_PAD_CLASS_CAST
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#endif
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/*
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* Real Pads
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*/
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#define GST_TYPE_REAL_PAD (_gst_real_pad_type)
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#define GST_REAL_PAD_CAST(obj) ((GstRealPad*)(obj))
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#define GST_REAL_PAD_CLASS_CAST(klass) ((GstRealPadClass*)(klass))
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#define GST_IS_REAL_PAD(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_REAL_PAD))
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#define GST_IS_REAL_PAD_FAST(obj) (G_OBJECT_TYPE(obj) == GST_TYPE_REAL_PAD)
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#define GST_IS_REAL_PAD_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_REAL_PAD))
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#ifdef GST_TYPE_PARANOID
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# define GST_REAL_PAD(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_REAL_PAD, GstRealPad))
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# define GST_REAL_PAD_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_REAL_PAD, GstRealPadClass))
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#else
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# define GST_REAL_PAD GST_REAL_PAD_CAST
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# define GST_REAL_PAD_CLASS GST_REAL_PAD_CLASS_CAST
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#endif
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/*
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* Ghost Pads
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*/
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#define GST_TYPE_GHOST_PAD (_gst_ghost_pad_type)
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#define GST_GHOST_PAD_CAST(obj) ((GstGhostPad*)(obj))
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#define GST_GHOST_PAD_CLASS_CAST(klass) ((GstGhostPadClass*)(klass))
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#define GST_IS_GHOST_PAD(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_GHOST_PAD))
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#define GST_IS_GHOST_PAD_FAST(obj) (G_OBJECT_TYPE(obj) == GST_TYPE_GHOST_PAD)
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#define GST_IS_GHOST_PAD_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_GHOST_PAD))
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#ifdef GST_TYPE_PARANOID
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# define GST_GHOST_PAD(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_GHOST_PAD, GstGhostPad))
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# define GST_GHOST_PAD_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_GHOST_PAD, GstGhostPadClass))
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#else
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# define GST_GHOST_PAD GST_GHOST_PAD_CAST
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# define GST_GHOST_PAD_CLASS GST_GHOST_PAD_CLASS_CAST
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#endif
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/*typedef struct _GstPad GstPad; */
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/*typedef struct _GstPadClass GstPadClass;*/
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typedef struct _GstRealPad GstRealPad;
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typedef struct _GstRealPadClass GstRealPadClass;
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typedef struct _GstGhostPad GstGhostPad;
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typedef struct _GstGhostPadClass GstGhostPadClass;
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/*typedef struct _GstPadTemplate GstPadTemplate;*/
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/*typedef struct _GstPadTemplateClass GstPadTemplateClass;*/
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typedef enum {
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GST_PAD_CONNECT_REFUSED = -1,
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GST_PAD_CONNECT_DELAYED = 0,
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GST_PAD_CONNECT_OK = 1,
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GST_PAD_CONNECT_DONE = 2
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} GstPadConnectReturn;
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typedef enum {
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GST_PAD_QUERY_NONE = 0,
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GST_PAD_QUERY_TOTAL,
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GST_PAD_QUERY_POSITION,
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GST_PAD_QUERY_LATENCY,
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GST_PAD_QUERY_JITTER,
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GST_PAD_QUERY_START,
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GST_PAD_QUERY_SEGMENT_END,
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GST_PAD_QUERY_RATE
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} GstPadQueryType;
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#define GST_PAD_QUERY_TYPE_FUNCTION(functionname, a...) \
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static const GstPadQueryType* \
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functionname (GstPad *pad) \
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{ \
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static const GstPadQueryType types[] = { \
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a, \
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0 \
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}; \
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return types; \
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}
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/* this defines the functions used to chain buffers
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* pad is the sink pad (so the same chain function can be used for N pads)
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* buf is the buffer being passed */
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typedef void (*GstPadChainFunction) (GstPad *pad,GstBuffer *buf);
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typedef GstBuffer* (*GstPadGetFunction) (GstPad *pad);
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typedef gboolean (*GstPadEventFunction) (GstPad *pad, GstEvent *event);
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typedef gboolean (*GstPadConvertFunction) (GstPad *pad,
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GstFormat src_format, gint64 src_value,
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GstFormat *dest_format, gint64 *dest_value);
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typedef gboolean (*GstPadQueryFunction) (GstPad *pad, GstPadQueryType type,
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GstFormat *format, gint64 *value);
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typedef GList* (*GstPadIntConnFunction) (GstPad *pad);
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typedef const GstFormat* (*GstPadFormatsFunction) (GstPad *pad);
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typedef const GstEventMask* (*GstPadEventMaskFunction) (GstPad *pad);
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typedef const GstPadQueryType* (*GstPadQueryTypeFunction) (GstPad *pad);
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typedef GstPadConnectReturn (*GstPadConnectFunction) (GstPad *pad, GstCaps *caps);
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typedef GstCaps* (*GstPadGetCapsFunction) (GstPad *pad, GstCaps *caps);
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typedef GstBufferPool* (*GstPadBufferPoolFunction) (GstPad *pad);
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typedef gboolean (*GstPadDispatcherFunction) (GstPad *pad, gpointer data);
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typedef enum {
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GST_PAD_UNKNOWN,
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GST_PAD_SRC,
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GST_PAD_SINK
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} GstPadDirection;
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typedef enum {
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GST_PAD_DISABLED = GST_OBJECT_FLAG_LAST,
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GST_PAD_EOS,
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GST_PAD_FLAG_LAST = GST_OBJECT_FLAG_LAST + 4
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} GstPadFlags;
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struct _GstPad {
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GstObject object;
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gpointer element_private;
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GstPadTemplate *padtemplate; /* the template for this pad */
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};
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struct _GstPadClass {
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GstObjectClass parent_class;
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};
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struct _GstRealPad {
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GstPad pad;
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/* the pad cpabilities */
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GstCaps *caps;
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GstCaps *filter;
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GstCaps *appfilter;
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GstPadGetCapsFunction getcapsfunc;
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GstPadDirection direction;
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GstScheduler *sched;
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gpointer sched_private;
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GstPadConnectFunction connectfunc;
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GstRealPad *peer;
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GstBuffer *bufpen;
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/* data transport functions */
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GstPadChainFunction chainfunc;
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GstPadChainFunction chainhandler;
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GstPadGetFunction getfunc;
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GstPadGetFunction gethandler;
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GstPadEventFunction eventfunc;
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GstPadEventFunction eventhandler;
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GstPadEventMaskFunction eventmaskfunc;
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GList *ghostpads;
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/* query/convert/formats functions */
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GstPadConvertFunction convertfunc;
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GstPadQueryFunction queryfunc;
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GstPadFormatsFunction formatsfunc;
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GstPadQueryTypeFunction querytypefunc;
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GstPadIntConnFunction intconnfunc;
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GstPadBufferPoolFunction bufferpoolfunc;
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};
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struct _GstRealPadClass {
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GstPadClass parent_class;
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/* signal callbacks */
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void (*set_active) (GstPad *pad, gboolean active);
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void (*caps_changed) (GstPad *pad, GstCaps *newcaps);
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void (*caps_nego_failed) (GstPad *pad);
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void (*connected) (GstPad *pad, GstPad *peer);
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void (*disconnected) (GstPad *pad, GstPad *peer);
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void (*event_received) (GstPad *pad, GstEvent *event);
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void (*eos) (GstPad *pad);
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};
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struct _GstGhostPad {
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GstPad pad;
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GstRealPad *realpad;
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};
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struct _GstGhostPadClass {
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GstPadClass parent_class;
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};
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/***** helper macros *****/
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/* GstPad */
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#define GST_PAD_NAME(pad) (GST_OBJECT_NAME(pad))
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#define GST_PAD_PARENT(pad) ((GstElement *)(GST_OBJECT_PARENT(pad)))
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#define GST_PAD_ELEMENT_PRIVATE(pad) (((GstPad *)(pad))->element_private)
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#define GST_PAD_PAD_TEMPLATE(pad) (((GstPad *)(pad))->padtemplate)
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/* GstRealPad */
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#define GST_RPAD_DIRECTION(pad) (((GstRealPad *)(pad))->direction)
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#define GST_RPAD_CAPS(pad) (((GstRealPad *)(pad))->caps)
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#define GST_RPAD_FILTER(pad) (((GstRealPad *)(pad))->filter)
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#define GST_RPAD_APPFILTER(pad) (((GstRealPad *)(pad))->appfilter)
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#define GST_RPAD_PEER(pad) (((GstRealPad *)(pad))->peer)
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#define GST_RPAD_BUFPEN(pad) (((GstRealPad *)(pad))->bufpen)
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#define GST_RPAD_SCHED(pad) (((GstRealPad *)(pad))->sched)
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#define GST_RPAD_CHAINFUNC(pad) (((GstRealPad *)(pad))->chainfunc)
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#define GST_RPAD_CHAINHANDLER(pad) (((GstRealPad *)(pad))->chainhandler)
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#define GST_RPAD_GETFUNC(pad) (((GstRealPad *)(pad))->getfunc)
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#define GST_RPAD_GETHANDLER(pad) (((GstRealPad *)(pad))->gethandler)
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#define GST_RPAD_EVENTFUNC(pad) (((GstRealPad *)(pad))->eventfunc)
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#define GST_RPAD_EVENTHANDLER(pad) (((GstRealPad *)(pad))->eventhandler)
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#define GST_RPAD_CONVERTFUNC(pad) (((GstRealPad *)(pad))->convertfunc)
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#define GST_RPAD_QUERYFUNC(pad) (((GstRealPad *)(pad))->queryfunc)
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#define GST_RPAD_INTCONNFUNC(pad) (((GstRealPad *)(pad))->intconnfunc)
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#define GST_RPAD_FORMATSFUNC(pad) (((GstRealPad *)(pad))->formatsfunc)
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#define GST_RPAD_QUERYTYPEFUNC(pad) (((GstRealPad *)(pad))->querytypefunc)
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#define GST_RPAD_EVENTMASKFUNC(pad) (((GstRealPad *)(pad))->eventmaskfunc)
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#define GST_RPAD_EVENT_MASKS(pad) (((GstRealPad *)(pad))->event_masks)
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#define GST_RPAD_QUERY_TYPES(pad) (((GstRealPad *)(pad))->query_types)
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#define GST_RPAD_CONNECTFUNC(pad) (((GstRealPad *)(pad))->connectfunc)
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#define GST_RPAD_GETCAPSFUNC(pad) (((GstRealPad *)(pad))->getcapsfunc)
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#define GST_RPAD_BUFFERPOOLFUNC(pad) (((GstRealPad *)(pad))->bufferpoolfunc)
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/* GstGhostPad */
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#define GST_GPAD_REALPAD(pad) (((GstGhostPad *)(pad))->realpad)
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/* Generic */
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#define GST_PAD_REALIZE(pad) (GST_IS_REAL_PAD(pad) ? ((GstRealPad *)(pad)) : GST_GPAD_REALPAD(pad))
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#define GST_PAD_DIRECTION(pad) GST_RPAD_DIRECTION(GST_PAD_REALIZE(pad))
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#define GST_PAD_CAPS(pad) GST_RPAD_CAPS(GST_PAD_REALIZE(pad))
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#define GST_PAD_PEER(pad) GST_PAD_CAST(GST_RPAD_PEER(GST_PAD_REALIZE(pad)))
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/* Some check functions (unused?) */
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#define GST_PAD_IS_CONNECTED(pad) (GST_PAD_PEER(pad) != NULL)
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#define GST_PAD_IS_ACTIVE(pad) (!GST_FLAG_IS_SET(pad, GST_PAD_DISABLED))
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#define GST_PAD_IS_USABLE(pad) (GST_PAD_IS_CONNECTED (pad) && \
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GST_PAD_IS_ACTIVE(pad) && GST_PAD_IS_ACTIVE(GST_PAD_PEER (pad)))
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#define GST_PAD_CAN_PULL(pad) (GST_IS_REAL_PAD(pad) && GST_REAL_PAD(pad)->gethandler != NULL)
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#define GST_PAD_IS_SRC(pad) (GST_PAD_DIRECTION(pad) == GST_PAD_SRC)
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#define GST_PAD_IS_SINK(pad) (GST_PAD_DIRECTION(pad) == GST_PAD_SINK)
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/***** PadTemplate *****/
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#define GST_TYPE_PAD_TEMPLATE (gst_pad_template_get_type ())
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#define GST_PAD_TEMPLATE(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_PAD_TEMPLATE,GstPadTemplate))
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#define GST_PAD_TEMPLATE_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_PAD_TEMPLATE,GstPadTemplateClass))
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#define GST_IS_PAD_TEMPLATE(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_PAD_TEMPLATE))
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#define GST_IS_PAD_TEMPLATE_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_PAD_TEMPLATE))
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typedef enum {
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GST_PAD_ALWAYS,
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GST_PAD_SOMETIMES,
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GST_PAD_REQUEST
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} GstPadPresence;
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#define GST_PAD_TEMPLATE_NAME_TEMPLATE(templ) (((GstPadTemplate *)(templ))->name_template)
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#define GST_PAD_TEMPLATE_DIRECTION(templ) (((GstPadTemplate *)(templ))->direction)
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#define GST_PAD_TEMPLATE_PRESENCE(templ) (((GstPadTemplate *)(templ))->presence)
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#define GST_PAD_TEMPLATE_CAPS(templ) (((GstPadTemplate *)(templ))->caps)
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#define GST_PAD_TEMPLATE_FIXED(templ) (((GstPadTemplate *)(templ))->fixed)
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#define GST_PAD_TEMPLATE_IS_FIXED(templ) (GST_PAD_TEMPLATE_FIXED(templ) == TRUE)
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struct _GstPadTemplate {
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GstObject object;
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gchar *name_template;
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GstPadDirection direction;
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GstPadPresence presence;
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GstCaps *caps;
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gboolean fixed;
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};
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struct _GstPadTemplateClass {
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GstObjectClass parent_class;
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/* signal callbacks */
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void (*pad_created) (GstPadTemplate *templ, GstPad *pad);
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};
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/* CR1: the space after 'a' is necessary because of preprocessing in gcc */
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#define GST_PAD_TEMPLATE_NEW(padname, dir, pres, a...) \
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gst_pad_template_new ( \
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padname, \
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dir, \
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pres, \
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a , \
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NULL)
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#define GST_PAD_TEMPLATE_FACTORY(name, padname, dir, pres, a...) \
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static GstPadTemplate* \
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name (void) \
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{ \
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static GstPadTemplate *templ = NULL; \
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if (!templ) { \
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templ = GST_PAD_TEMPLATE_NEW ( \
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padname, \
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dir, \
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pres, \
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a ); \
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} \
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return templ; \
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}
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#define GST_PAD_TEMPLATE_GET(fact) (fact)()
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GType gst_pad_get_type (void);
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GType gst_real_pad_get_type (void);
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GType gst_ghost_pad_get_type (void);
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/* creating pads */
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GstPad* gst_pad_new (const gchar *name, GstPadDirection direction);
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#define gst_pad_destroy(pad) gst_object_destroy (GST_OBJECT (pad))
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GstPad* gst_pad_new_from_template (GstPadTemplate *templ, const gchar *name);
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GstPad* gst_pad_custom_new (GType type, const gchar *name, GstPadDirection direction);
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GstPad* gst_pad_custom_new_from_template (GType type, GstPadTemplate *templ, const gchar *name);
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void gst_pad_set_name (GstPad *pad, const gchar *name);
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const gchar* gst_pad_get_name (GstPad *pad);
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GstPadDirection gst_pad_get_direction (GstPad *pad);
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void gst_pad_set_active (GstPad *pad, gboolean active);
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gboolean gst_pad_is_active (GstPad *pad);
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void gst_pad_set_element_private (GstPad *pad, gpointer priv);
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gpointer gst_pad_get_element_private (GstPad *pad);
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void gst_pad_set_parent (GstPad *pad, GstObject *parent);
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GstElement* gst_pad_get_parent (GstPad *pad);
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GstElement* gst_pad_get_real_parent (GstPad *pad);
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void gst_pad_set_scheduler (GstPad *pad, GstScheduler *sched);
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GstScheduler* gst_pad_get_scheduler (GstPad *pad);
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void gst_pad_unset_scheduler (GstPad *pad);
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void gst_pad_add_ghost_pad (GstPad *pad, GstPad *ghostpad);
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void gst_pad_remove_ghost_pad (GstPad *pad, GstPad *ghostpad);
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GList* gst_pad_get_ghost_pad_list (GstPad *pad);
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GstPadTemplate* gst_pad_get_pad_template (GstPad *pad);
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void gst_pad_set_bufferpool_function (GstPad *pad, GstPadBufferPoolFunction bufpool);
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GstBufferPool* gst_pad_get_bufferpool (GstPad *pad);
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/* data passing setup functions */
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void gst_pad_set_chain_function (GstPad *pad, GstPadChainFunction chain);
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void gst_pad_set_get_function (GstPad *pad, GstPadGetFunction get);
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void gst_pad_set_event_function (GstPad *pad, GstPadEventFunction event);
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void gst_pad_set_event_mask_function (GstPad *pad, GstPadEventMaskFunction mask_func);
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const GstEventMask* gst_pad_get_event_masks (GstPad *pad);
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const GstEventMask* gst_pad_get_event_masks_default (GstPad *pad);
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gboolean gst_pad_handles_event (GstPad *pad, GstEventMask *mask);
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/* pad connections */
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void gst_pad_set_connect_function (GstPad *pad, GstPadConnectFunction connect);
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gboolean gst_pad_can_connect (GstPad *srcpad, GstPad *sinkpad);
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gboolean gst_pad_can_connect_filtered (GstPad *srcpad, GstPad *sinkpad, GstCaps *filtercaps);
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gboolean gst_pad_connect (GstPad *srcpad, GstPad *sinkpad);
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gboolean gst_pad_connect_filtered (GstPad *srcpad, GstPad *sinkpad, GstCaps *filtercaps);
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void gst_pad_disconnect (GstPad *srcpad, GstPad *sinkpad);
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GstPad* gst_pad_get_peer (GstPad *pad);
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/* capsnego functions */
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GstCaps* gst_pad_get_caps (GstPad *pad);
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GstCaps* gst_pad_get_pad_template_caps (GstPad *pad);
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gboolean gst_pad_try_set_caps (GstPad *pad, GstCaps *caps);
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gboolean gst_pad_check_compatibility (GstPad *srcpad, GstPad *sinkpad);
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void gst_pad_set_getcaps_function (GstPad *pad, GstPadGetCapsFunction getcaps);
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GstPadConnectReturn gst_pad_proxy_connect (GstPad *pad, GstCaps *caps);
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gboolean gst_pad_reconnect_filtered (GstPad *srcpad, GstPad *sinkpad, GstCaps *filtercaps);
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gboolean gst_pad_perform_negotiate (GstPad *srcpad, GstPad *sinkpad);
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gboolean gst_pad_try_reconnect_filtered (GstPad *srcpad, GstPad *sinkpad, GstCaps *filtercaps);
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GstCaps* gst_pad_get_allowed_caps (GstPad *pad);
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gboolean gst_pad_recalc_allowed_caps (GstPad *pad);
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/* data passing functions */
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void gst_pad_push (GstPad *pad, GstBuffer *buf);
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GstBuffer* gst_pad_pull (GstPad *pad);
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gboolean gst_pad_send_event (GstPad *pad, GstEvent *event);
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gboolean gst_pad_event_default (GstPad *pad, GstEvent *event);
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GstBuffer* gst_pad_peek (GstPad *pad);
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GstPad* gst_pad_select (GList *padlist);
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GstPad* gst_pad_selectv (GstPad *pad, ...);
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/* convert/query/format functions */
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void gst_pad_set_formats_function (GstPad *pad, GstPadFormatsFunction format);
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gboolean gst_pad_handles_format (GstPad *pad, GstFormat format);
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const GstFormat* gst_pad_get_formats (GstPad *pad);
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const GstFormat* gst_pad_get_formats_default (GstPad *pad);
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void gst_pad_set_convert_function (GstPad *pad, GstPadConvertFunction convert);
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gboolean gst_pad_convert (GstPad *pad,
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GstFormat src_format, gint64 src_value,
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GstFormat *dest_format, gint64 *dest_value);
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gboolean gst_pad_convert_default (GstPad *pad,
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GstFormat src_format, gint64 src_value,
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GstFormat *dest_format, gint64 *dest_value);
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void gst_pad_set_query_function (GstPad *pad, GstPadQueryFunction query);
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void gst_pad_set_query_type_function (GstPad *pad, GstPadQueryTypeFunction type_function);
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const GstPadQueryType* gst_pad_get_query_types (GstPad *pad);
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const GstPadQueryType* gst_pad_get_query_types_default (GstPad *pad);
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gboolean gst_pad_query (GstPad *pad, GstPadQueryType type,
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GstFormat *format, gint64 *value);
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gboolean gst_pad_query_default (GstPad *pad, GstPadQueryType type,
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GstFormat *format, gint64 *value);
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void gst_pad_set_internal_connection_function(GstPad *pad, GstPadIntConnFunction intconn);
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GList* gst_pad_get_internal_connections (GstPad *pad);
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GList* gst_pad_get_internal_connections_default (GstPad *pad);
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/* misc helper functions */
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gboolean gst_pad_dispatcher (GstPad *pad, GstPadDispatcherFunction dispatch,
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gpointer data);
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#ifndef GST_DISABLE_LOADSAVE
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void gst_pad_load_and_connect (xmlNodePtr self, GstObject *parent);
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#endif
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/* ghostpads */
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GstPad* gst_ghost_pad_new (const gchar *name, GstPad *pad);
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/* templates and factories */
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GType gst_pad_template_get_type (void);
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GstPadTemplate* gst_pad_template_new (const gchar *name_template,
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GstPadDirection direction, GstPadPresence presence,
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GstCaps *caps, ...);
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GstCaps* gst_pad_template_get_caps (GstPadTemplate *templ);
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GstCaps* gst_pad_template_get_caps_by_name (GstPadTemplate *templ, const gchar *name);
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xmlNodePtr gst_pad_ghost_save_thyself (GstPad *pad,
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GstElement *bin,
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xmlNodePtr parent);
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G_END_DECLS
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#endif /* __GST_PAD_H__ */
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