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gstreamer/gst/gstpad.h
Erik Walthinsen c31f9a570c First pass at updating to new ghostpad system. The objects are in place, 
Original commit message from CVS:
First pass at updating to new ghostpad system.  The objects are in place,
I now need to go and get all the Bin end of things worked out.  Testing
should be fairly easy, at least for verification.

Everything I've tried so far works with no changes, with is amazing.
That's just cool.  Once again we rewrite an entire subsystem, and nothing
else notices anything but the new features ;-)
2001-01-19 02:23:35 +00:00

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wim.taymans@chello.be>
*
* gstpad.h: Header for GstPad object
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef __GST_PAD_H__
#define __GST_PAD_H__
#include <parser.h> // NOTE: This is xml-config's fault
#include <gst/gstobject.h>
#include <gst/gstbuffer.h>
#include <gst/cothreads.h>
#include <gst/gstcaps.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
#define GST_TYPE_PAD (gst_pad_get_type ())
#define GST_PAD(obj) (GTK_CHECK_CAST ((obj), GST_TYPE_PAD,GstPad))
#define GST_PAD_CLASS(klass) (GTK_CHECK_CLASS_CAST ((klass), GST_TYPE_PAD,GstPadClass))
#define GST_IS_PAD(obj) (GTK_CHECK_TYPE ((obj), GST_TYPE_PAD))
#define GST_IS_PAD_CLASS(obj) (GTK_CHECK_CLASS_TYPE ((klass), GST_TYPE_PAD))
#define GST_TYPE_REAL_PAD (gst_real_pad_get_type ())
#define GST_REAL_PAD(obj) (GTK_CHECK_CAST ((obj), GST_TYPE_REAL_PAD,GstRealPad))
#define GST_REAL_PAD_CLASS(klass) (GTK_CHECK_CLASS_CAST ((klass), GST_TYPE_REAL_PAD,GstRealPadClass))
#define GST_IS_REAL_PAD(obj) (GTK_CHECK_TYPE ((obj), GST_TYPE_REAL_PAD))
#define GST_IS_REAL_PAD_CLASS(obj) (GTK_CHECK_CLASS_TYPE ((klass), GST_TYPE_REAL_PAD))
#define GST_TYPE_GHOST_PAD (gst_ghost_pad_get_type ())
#define GST_GHOST_PAD(obj) (GTK_CHECK_CAST ((obj), GST_TYPE_GHOST_PAD,GstGhostPad))
#define GST_GHOST_PAD_CLASS(klass) (GTK_CHECK_CLASS_CAST ((klass), GST_TYPE_GHOST_PAD,GstGhostPadClass))
#define GST_IS_GHOST_PAD(obj) (GTK_CHECK_TYPE ((obj), GST_TYPE_GHOST_PAD))
#define GST_IS_GHOST_PAD_CLASS(obj) (GTK_CHECK_CLASS_TYPE ((klass), GST_TYPE_GHOST_PAD))
typedef struct _GstPad GstPad;
typedef struct _GstPadClass GstPadClass;
typedef struct _GstRealPad GstRealPad;
typedef struct _GstRealPadClass GstRealPadClass;
typedef struct _GstGhostPad GstGhostPad;
typedef struct _GstGhostPadClass GstGhostPadClass;
typedef struct _GstPadTemplate GstPadTemplate;
typedef struct _GstPadTemplateClass GstPadTemplateClass;
/* this defines the functions used to chain buffers
* pad is the sink pad (so the same chain function can be used for N pads)
* buf is the buffer being passed */
typedef void (*GstPadChainFunction) (GstPad *pad,GstBuffer *buf);
typedef GstBuffer *(*GstPadGetFunction) (GstPad *pad);
typedef GstBuffer *(*GstPadGetRegionFunction) (GstPad *pad, gulong offset, gulong size);
typedef void (*GstPadQoSFunction) (GstPad *pad, glong qos_message);
typedef void (*GstPadPushFunction) (GstPad *pad, GstBuffer *buf);
typedef GstBuffer *(*GstPadPullFunction) (GstPad *pad);
typedef GstBuffer *(*GstPadPullRegionFunction) (GstPad *pad, gulong offset, gulong size);
typedef gboolean (*GstPadEOSFunction) (GstPad *pad);
typedef enum {
GST_PAD_UNKNOWN,
GST_PAD_SRC,
GST_PAD_SINK,
} GstPadDirection;
typedef enum {
GST_PAD_DISABLED = GST_OBJECT_FLAG_LAST,
GST_PAD_EOS,
GST_PAD_FLAG_LAST = GST_OBJECT_FLAG_LAST + 4,
} GstPadFlags;
struct _GstPad {
GstObject object;
gchar *name;
gpointer element_private;
GstObject *parent;
GstPadTemplate *padtemplate; /* the template for this pad */
};
struct _GstPadClass {
GstObjectClass parent_class;
};
/* quick access macros */
#define GST_PAD_NAME(pad) (GST_PAD(pad)->name)
#define GST_PAD_DIRECTION(pad) (GST_PAD(pad)->direction)
#define GST_PAD_PARENT(pad) (GST_PAD(pad)->parent)
struct _GstRealPad {
GstPad pad;
GList *caps;
GstPadDirection direction;
cothread_state *threadstate;
GstRealPad *peer;
GstBuffer *bufpen;
GstPadChainFunction chainfunc;
GstPadGetFunction getfunc;
GstPadGetRegionFunction getregionfunc;
GstPadQoSFunction qosfunc;
GstPadEOSFunction eosfunc;
GstPadPushFunction pushfunc;
GstPadPullFunction pullfunc;
GstPadPullRegionFunction pullregionfunc;
GList *ghostparents;
};
/* quick test to see if the pad is connected */
#define GST_PAD_CONNECTED(pad) (GST_IS_REAL_PAD(pad) && GST_REAL_PAD(pad)->peer != NULL)
#define GST_PAD_CAN_PULL(pad) (GST_IS_REAL_PAD(pad) && GST_REAL_PAD(pad)->pullfunc != NULL)
struct _GstRealPadClass {
GstPadClass parent_class;
/* signal callbacks */
void (*set_active) (GstPad *pad, gboolean active);
void (*caps_changed) (GstPad *pad, GstCaps *newcaps);
void (*eos) (GstPad *pad);
};
struct _GstGhostPad {
GstPad pad;
GstRealPad *realpad;
};
struct _GstGhostPadClass {
GstPadClass parent_class;
};
/* template */
#define GST_TYPE_PADTEMPLATE (gst_padtemplate_get_type ())
#define GST_PADTEMPLATE(obj) (GTK_CHECK_CAST ((obj), GST_TYPE_PADTEMPLATE,GstPad))
#define GST_PADTEMPLATE_CLASS(klass) (GTK_CHECK_CLASS_CAST ((klass), GST_TYPE_PADTEMPLATE,GstPadClass))
#define GST_IS_PADTEMPLATE(obj) (GTK_CHECK_TYPE ((obj), GST_TYPE_PADTEMPLATE))
#define GST_IS_PADTEMPLATE_CLASS(obj) (GTK_CHECK_CLASS_TYPE ((klass), GST_TYPE_PADTEMPLATE))
typedef enum {
GST_PAD_ALWAYS,
GST_PAD_SOMETIMES,
GST_PAD_REQUEST,
} GstPadPresence;
struct _GstPadTemplate {
GstObject object;
gchar *name_template;
GstPadDirection direction;
GstPadPresence presence;
GList *caps;
};
struct _GstPadTemplateClass {
GstObjectClass parent_class;
/* signal callbacks */
void (*pad_created) (GstPadTemplate *temp, GstPad *pad);
};
/* factory */
typedef gpointer GstPadFactoryEntry;
typedef GstPadFactoryEntry GstPadFactory[];
#define GST_PAD_FACTORY_ALWAYS GINT_TO_POINTER(GST_PAD_ALWAYS)
#define GST_PAD_FACTORY_SOMETIMES GINT_TO_POINTER(GST_PAD_SOMETIMES)
#define GST_PAD_FACTORY_REQUEST GINT_TO_POINTER(GST_PAD_REQUEST)
#define GST_PAD_FACTORY_SRC GINT_TO_POINTER(GST_PAD_SRC)
#define GST_PAD_FACTORY_SINK GINT_TO_POINTER(GST_PAD_SINK)
#define GST_PAD_FACTORY_CAPS(a...) GINT_TO_POINTER(1),##a,NULL
GtkType gst_pad_get_type (void);
GtkType gst_real_pad_get_type (void);
GtkType gst_ghost_pad_get_type (void);
GstPad* gst_pad_new (gchar *name, GstPadDirection direction);
#define gst_pad_destroy(pad) gst_object_destroy (GST_OBJECT (pad))
GstPad* gst_pad_new_from_template (GstPadTemplate *temp, gchar *name);
GstPadDirection gst_pad_get_direction (GstPad *pad);
void gst_pad_set_chain_function (GstPad *pad, GstPadChainFunction chain);
void gst_pad_set_get_function (GstPad *pad, GstPadGetFunction get);
void gst_pad_set_getregion_function (GstPad *pad, GstPadGetRegionFunction getregion);
void gst_pad_set_qos_function (GstPad *pad, GstPadQoSFunction qos);
void gst_pad_set_eos_function (GstPad *pad, GstPadEOSFunction eos);
void gst_pad_set_caps_list (GstPad *pad, GList *caps);
GList* gst_pad_get_caps_list (GstPad *pad);
GstCaps* gst_pad_get_caps_by_name (GstPad *pad, gchar *name);
gboolean gst_pad_check_compatibility (GstPad *srcpad, GstPad *sinkpad);
void gst_pad_set_name (GstPad *pad, const gchar *name);
const gchar* gst_pad_get_name (GstPad *pad);
void gst_pad_set_element_private (GstPad *pad, gpointer priv);
gpointer gst_pad_get_element_private (GstPad *pad);
void gst_pad_set_parent (GstPad *pad, GstObject *parent);
GstObject* gst_pad_get_parent (GstPad *pad);
void gst_pad_add_ghost_parent (GstPad *pad, GstObject *parent);
void gst_pad_remove_ghost_parent (GstPad *pad, GstObject *parent);
GList* gst_pad_get_ghost_parents (GstPad *pad);
GstPad* gst_pad_get_peer (GstPad *pad);
void gst_pad_connect (GstPad *srcpad, GstPad *sinkpad);
void gst_pad_disconnect (GstPad *srcpad, GstPad *sinkpad);
#if 1
void gst_pad_push (GstPad *pad, GstBuffer *buffer);
#else
#define gst_pad_push(pad,buf) G_STMT_START{ \
if ((pad)->peer->pushfunc) ((pad)->peer->pushfunc)((pad)->peer,(buf)); \
}G_STMT_END
#endif
#if 1
GstBuffer* gst_pad_pull (GstPad *pad);
GstBuffer* gst_pad_pull_region (GstPad *pad, gulong offset, gulong size);
#else
#define gst_pad_pull(pad) \
(((pad)->peer->pullfunc) ? ((pad)->peer->pullfunc)((pad)->peer) : NULL)
#define gst_pad_pullregion(pad,offset,size) \
(((pad)->peer->pullregionfunc) ? ((pad)->peer->pullregionfunc)((pad)->peer,(offset),(size)) : NULL)
#endif
GstPad * gst_pad_select (GstPad *nextpad, ...);
#define gst_pad_eos(pad) ((pad)->peer->eosfunc((pad)->peer))
gboolean gst_pad_set_eos (GstPad *pad);
gboolean gst_pad_eos_func (GstPad *pad);
void gst_pad_handle_qos (GstPad *pad, glong qos_message);
xmlNodePtr gst_pad_save_thyself (GstPad *pad, xmlNodePtr parent);
void gst_pad_load_and_connect (xmlNodePtr parent, GstObject *element, GHashTable *elements);
/* templates and factories */
GtkType gst_padtemplate_get_type (void);
GstPadTemplate* gst_padtemplate_new (GstPadFactory *factory);
GstPadTemplate* gst_padtemplate_create (gchar *name_template,
GstPadDirection direction, GstPadPresence presence,
GList *caps);
xmlNodePtr gst_padtemplate_save_thyself (GstPadTemplate *pad, xmlNodePtr parent);
GstPadTemplate* gst_padtemplate_load_thyself (xmlNodePtr parent);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* __GST_PAD_H__ */
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