/* Gnome-Streamer
 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
 *
 * 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 <gnome-xml/parser.h>
#include <gst/gstobject.h>
#include <gst/gstbuffer.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))

// quick test to see if the pad is connected
#define GST_PAD_CONNECTED(pad) \
	((pad)->peer != NULL)
#define GST_PAD_CAN_PULL(pad) \
	((pad)->pull != NULL)

typedef struct _GstPad GstPad;
typedef struct _GstPadClass GstPadClass;

/* 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 *(*GstPadPullFunction) (GstPad *pad);
typedef void (*GstPadPushFunction) (GstPad *pad);

typedef enum {
  GST_PAD_UNKNOWN,
  GST_PAD_SRC,
  GST_PAD_SINK,
} GstPadDirection;

//typedef enum {
//} GstPadFlags;

struct _GstPad {
  GstObject object;

  gchar *name;
  guint16 type;

  GstPadDirection direction;

  GstPad *peer;

  GstBuffer *bufpen;

  GstPadChainFunction chain;
  GstPadPullFunction pull;

  GstObject *parent;
  GList *ghostparents;
};

struct _GstPadClass {
  GstObjectClass parent_class;
};

GtkType gst_pad_get_type(void);
GstPad *gst_pad_new(gchar *name,GstPadDirection direction);
void gst_pad_destroy(GstPad *pad);

GstPadDirection gst_pad_get_direction(GstPad *pad);
void gst_pad_set_chain_function(GstPad *pad,GstPadChainFunction chain);
void gst_pad_set_pull_function(GstPad *pad, GstPadPullFunction pull);

guint16 gst_pad_get_type_id(GstPad *pad);
void gst_pad_set_type_id(GstPad *pad,guint16 id);

void gst_pad_set_name(GstPad *pad,gchar *name);
gchar *gst_pad_get_name(GstPad *pad);
#define gst_pad_destroy(pad) gst_object_destroy(GST_OBJECT(pad))

void gst_pad_set_parent(GstPad *pad,GstObject *parent);
void gst_pad_add_ghost_parent(GstPad *pad,GstObject *parent);
void gst_pad_remove_ghost_parent(GstPad *pad,GstObject *parent);
GstObject *gst_pad_get_parent(GstPad *pad);
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);

void gst_pad_push(GstPad *pad,GstBuffer *buffer);
GstBuffer *gst_pad_pull(GstPad *pad);

xmlNodePtr gst_pad_save_thyself(GstPad *pad,xmlNodePtr parent);


#ifdef __cplusplus
}
#endif /* __cplusplus */


#endif /* __GST_PAD_H__ */