/* GStreamer

 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>

 *                    2000 Wim Taymans <wim.taymans@chello.be>

 *

 * gstpadtemplate.h: Header for GstPadTemplate 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_TEMPLATE_H__

#define __GST_PAD_TEMPLATE_H__

#include <gst/gstconfig.h>

#include <gst/gstobject.h>

#include <gst/gstbuffer.h>

#include <gst/gstcaps.h>

#include <gst/gstevent.h>

#include <gst/gstquery.h>

#include <gst/gsttask.h>

G_BEGIN_DECLS

/* FIXME: this awful circular dependency need to be resolved properly (see pad.h) */

/*typedef struct _GstPadTemplate GstPadTemplate; */

typedef struct _GstPadTemplateClass GstPadTemplateClass;

typedef struct _GstStaticPadTemplate GstStaticPadTemplate;

#define GST_TYPE_STATIC_PAD_TEMPLATE	(gst_static_pad_template_get_type ())

#define GST_TYPE_PAD_TEMPLATE		(gst_pad_template_get_type ())

#define GST_PAD_TEMPLATE(obj)		(G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_PAD_TEMPLATE,GstPadTemplate))

#define GST_PAD_TEMPLATE_CLASS(klass)	(G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_PAD_TEMPLATE,GstPadTemplateClass))

#define GST_IS_PAD_TEMPLATE(obj)	(G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_PAD_TEMPLATE))

#define GST_IS_PAD_TEMPLATE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_PAD_TEMPLATE))

/**

 * GstPadPresence:

 * @GST_PAD_ALWAYS: the pad is always available

 * @GST_PAD_SOMETIMES: the pad will become available depending on the media stream

 * @GST_PAD_REQUEST: the pad is only available on request with

 *  gst_element_request_pad_by_name() or gst_element_request_compatible_pad().

 *

 * Indicates when this pad will become available.

 */

typedef enum {

  GST_PAD_ALWAYS,

  GST_PAD_SOMETIMES,

  GST_PAD_REQUEST

} GstPadPresence;

/**

 * GST_PAD_TEMPLATE_NAME_TEMPLATE:

 * @templ: the template to query

 *

 * Get the nametemplate of the padtemplate.

 */

#define GST_PAD_TEMPLATE_NAME_TEMPLATE(templ)	(((GstPadTemplate *)(templ))->name_template)

/**

 * GST_PAD_TEMPLATE_DIRECTION:

 * @templ: the template to query

 *

 * Get the #GstPadDirection of the padtemplate.

 */

#define GST_PAD_TEMPLATE_DIRECTION(templ)	(((GstPadTemplate *)(templ))->direction)

/**

 * GST_PAD_TEMPLATE_PRESENCE:

 * @templ: the template to query

 *

 * Get the #GstPadPresence of the padtemplate.

 */

#define GST_PAD_TEMPLATE_PRESENCE(templ)	(((GstPadTemplate *)(templ))->presence)

/**

 * GST_PAD_TEMPLATE_CAPS:

 * @templ: the template to query

 *

 * Get a handle to the padtemplate #GstCaps

 */

#define GST_PAD_TEMPLATE_CAPS(templ)		(((GstPadTemplate *)(templ))->caps)

/**

 * GstPadTemplateFlags:

 * @GST_PAD_TEMPLATE_FIXED: the padtemplate has no variable properties

 * @GST_PAD_TEMPLATE_FLAG_LAST: first flag that can be used by subclasses.

 *

 * Flags for the padtemplate

 */

typedef enum {

  GST_PAD_TEMPLATE_FIXED        = (GST_OBJECT_FLAG_LAST << 0),

  /* padding */

  GST_PAD_TEMPLATE_FLAG_LAST    = (GST_OBJECT_FLAG_LAST << 4)

} GstPadTemplateFlags;

/**

 * GST_PAD_TEMPLATE_IS_FIXED:

 * @templ: the template to query

 *

 * Check if the properties of the padtemplate are fixed

 */

#define GST_PAD_TEMPLATE_IS_FIXED(templ)	(GST_OBJECT_FLAG_IS_SET(templ, GST_PAD_TEMPLATE_FIXED))

/**

 * GstPadTemplate:

 *

 * The padtemplate object.

 */

struct _GstPadTemplate {

  GstObject	   object;

  gchar           *name_template;

  GstPadDirection  direction;

  GstPadPresence   presence;

  GstCaps	  *caps;

  gpointer _gst_reserved[GST_PADDING];

};

struct _GstPadTemplateClass {

  GstObjectClass   parent_class;

  /* signal callbacks */

  void (*pad_created)	(GstPadTemplate *templ, GstPad *pad);

  gpointer _gst_reserved[GST_PADDING];

};

/** 

 * GstStaticPadTemplate:

 * @name_template: the name of the template

 * @direction: the direction of the template

 * @presence: the presence of the template

 * @static_caps: the caps of the template.

 *

 * Structure describing the #GstStaticPadTemplate.

 */

struct _GstStaticPadTemplate {

  const gchar     *name_template;

  GstPadDirection  direction;

  GstPadPresence   presence;

  GstStaticCaps    static_caps;

};

/**

 * GST_STATIC_PAD_TEMPLATE:

 * @padname: the name template of the pad

 * @dir: the GstPadDirection of the pad

 * @pres: the GstPadPresence of the pad

 * @caps: the GstStaticCaps of the pad

 *

 * Convenience macro to fill the values of a GstStaticPadTemplate

 * structure.

 */

#define GST_STATIC_PAD_TEMPLATE(padname, dir, pres, caps) \

{ \

  /* name_template */    padname, \

  /* direction */        dir, \

  /* presence */         pres, \

  /* caps */             caps \

}

/* templates and factories */

#ifdef __SYMBIAN32__

IMPORT_C

#endif

GType			gst_pad_template_get_type		(void);

#ifdef __SYMBIAN32__

IMPORT_C

#endif

GType			gst_static_pad_template_get_type	(void);

#ifdef __SYMBIAN32__

IMPORT_C

#endif

GstPadTemplate*		gst_pad_template_new			(const gchar *name_template,

								 GstPadDirection direction, GstPadPresence presence,

								 GstCaps *caps);

#ifdef __SYMBIAN32__

IMPORT_C

#endif

GstPadTemplate *	gst_static_pad_template_get             (GstStaticPadTemplate *pad_template);

#ifdef __SYMBIAN32__

IMPORT_C

#endif

GstCaps*		gst_static_pad_template_get_caps	(GstStaticPadTemplate *templ);

#ifdef __SYMBIAN32__

IMPORT_C

#endif

GstCaps*		gst_pad_template_get_caps		(GstPadTemplate *templ);

#ifdef __SYMBIAN32__

IMPORT_C

#endif

void                    gst_pad_template_pad_created            (GstPadTemplate * templ, GstPad * pad);

G_END_DECLS

#endif /* __GST_PAD_TEMPLATE_H__ */