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/* GStreamer
 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
 *                    2000 Wim Taymans <wtay@chello.be>
 *
 * gstelement.h: Header for GstElement
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 *
 * 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_ELEMENT_H__
#define __GST_ELEMENT_H__

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#include <parser.h> // NOTE: this is xml-config's fault
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// Include compatability defines: if libxml hasn't already defined these,
// we have an old version 1.x
#ifndef xmlChildrenNode
#define xmlChildrenNode childs
#define xmlRootNode root
#endif

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#include <gst/gstobject.h>
#include <gst/gstpad.h>
#include <gst/cothreads.h>

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */


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typedef enum {
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  GST_STATE_VOID_PENDING	= 0,
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  GST_STATE_NULL		= (1 << 0),
  GST_STATE_READY		= (1 << 1),
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  GST_STATE_PAUSED		= (1 << 2),
  GST_STATE_PLAYING		= (1 << 3),
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} GstElementState;

typedef enum {
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  GST_STATE_FAILURE		= 0,
  GST_STATE_SUCCESS		= 1,
  GST_STATE_ASYNC		= 2,
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} GstElementStateReturn;

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// NOTE: this probably should be done with an #ifdef to decide whether to safe-cast
// or to just do the non-checking cast.
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#define GST_STATE(obj)			(GST_ELEMENT(obj)->current_state)
#define GST_STATE_PENDING(obj)		(GST_ELEMENT(obj)->pending_state)

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// Note: using 8 bit shift mostly "just because", it leaves us enough room to grow <g>
#define GST_STATE_TRANSITION(obj)	((GST_STATE(obj)<<8) | GST_STATE_PENDING(obj))
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#define GST_STATE_NULL_TO_READY		((GST_STATE_NULL<<8) | GST_STATE_READY)
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#define GST_STATE_READY_TO_PAUSED	((GST_STATE_READY<<8) | GST_STATE_PAUSED)
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#define GST_STATE_PAUSED_TO_PLAYING	((GST_STATE_PAUSED<<8) | GST_STATE_PLAYING)
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#define GST_STATE_PLAYING_TO_PAUSED	((GST_STATE_PLAYING<<8) | GST_STATE_PAUSED)
#define GST_STATE_PAUSED_TO_READY	((GST_STATE_PAUSED<<8) | GST_STATE_READY)
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#define GST_STATE_READY_TO_NULL		((GST_STATE_READY<<8) | GST_STATE_NULL)
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#define GST_TYPE_ELEMENT \
  (gst_element_get_type())
#define GST_ELEMENT(obj) \
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  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_ELEMENT,GstElement))
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#define GST_ELEMENT_CLASS(klass) \
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  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ELEMENT,GstElementClass))
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#define GST_IS_ELEMENT(obj) \
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  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_ELEMENT))
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#define GST_IS_ELEMENT_CLASS(klass) \
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  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_ELEMENT))
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typedef enum {
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  /* element is complex (for some def.) and generally require a cothread */
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  GST_ELEMENT_COMPLEX		= GST_OBJECT_FLAG_LAST,
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  /* input and output pads aren't directly coupled to each other
     examples: queues, multi-output async readers, etc. */
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  GST_ELEMENT_DECOUPLED,
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  /* this element should be placed in a thread if at all possible */
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  GST_ELEMENT_THREAD_SUGGESTED,
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  /* this element is incable of seeking (FIXME: does this apply to filters?) */
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  GST_ELEMENT_NO_SEEK,
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  /***** !!!!! need to have a flag that says that an element must
    *not* be an entry into a scheduling chain !!!!! *****/
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  /* this element for some reason doesn't obey COTHREAD_STOPPING, or
     has some other reason why it can't be the entry */
  GST_ELEMENT_NO_ENTRY,
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  /* there is a new loopfunction ready for placement */
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  GST_ELEMENT_NEW_LOOPFUNC,
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  /* the cothread holding this element needs to be stopped */
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  GST_ELEMENT_COTHREAD_STOPPING,
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  /* the element has to be scheduled as a cothread for any sanity */
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  GST_ELEMENT_USE_COTHREAD,
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  /* if this element is in EOS */
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  GST_ELEMENT_EOS,

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  /* use some padding for future expansion */
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  GST_ELEMENT_FLAG_LAST		= GST_OBJECT_FLAG_LAST + 12,
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} GstElementFlags;

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#define GST_ELEMENT_IS_THREAD_SUGGESTED(obj)	(GST_FLAG_IS_SET(obj,GST_ELEMENT_THREAD_SUGGESTED))
#define GST_ELEMENT_IS_COTHREAD_STOPPING(obj)	(GST_FLAG_IS_SET(obj,GST_ELEMENT_COTHREAD_STOPPING))
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#define GST_ELEMENT_IS_EOS(obj)			(GST_FLAG_IS_SET(obj,GST_ELEMENT_EOS))
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#define GST_ELEMENT_NAME(obj)			(GST_OBJECT_NAME(obj))
#define GST_ELEMENT_PARENT(obj)			(GST_OBJECT_PARENT(obj))
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#define GST_ELEMENT_MANAGER(obj)		(((GstElement*)(obj))->manager)
#define GST_ELEMENT_SCHED(obj)			(((GstElement*)(obj))->sched)
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#define GST_ELEMENT_PADS(obj)			((obj)->pads)
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//typedef struct _GstElement GstElement;
//typedef struct _GstElementClass GstElementClass;
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typedef struct _GstElementDetails GstElementDetails;
typedef struct _GstElementFactory GstElementFactory;

typedef void (*GstElementLoopFunction) (GstElement *element);

struct _GstElement {
  GstObject object;

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  guint8 current_state;
  guint8 pending_state;
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  GstElementLoopFunction loopfunc;
  cothread_state *threadstate;
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  GstPad *select_pad;
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  guint16 numpads;
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  guint16 numsrcpads;
  guint16 numsinkpads;
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  GList *pads;

  GstElement *manager;
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  GstSchedule *sched;
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};

struct _GstElementClass {
  GstObjectClass parent_class;

  /* the elementfactory that created us */
  GstElementFactory *elementfactory;
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  /* templates for our pads */
  GList *padtemplates;
  gint numpadtemplates;
  
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  /* signal callbacks */
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  void (*state_change)		(GstElement *element,GstElementState state);
  void (*new_pad)		(GstElement *element,GstPad *pad);
  void (*pad_removed)		(GstElement *element,GstPad *pad);
  void (*new_ghost_pad) 	(GstElement *element,GstPad *pad);
  void (*ghost_pad_removed)	(GstElement *element,GstPad *pad);
  void (*error)			(GstElement *element,gchar *error);
  void (*eos)			(GstElement *element);

  /* local pointers for get/set */
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  void (*set_property) (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
  void (*get_property) (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
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  /* change the element state */
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  GstElementStateReturn (*change_state)		(GstElement *element);
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  /* request a new pad */
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  GstPad*		(*request_new_pad)	(GstElement *element, GstPadTemplate *templ);
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};

struct _GstElementDetails {
  gchar *longname;              /* long, english name */
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  gchar *klass;                 /* type of element, as hierarchy */
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  gchar *description;           /* insights of one form or another */
  gchar *version;               /* version of the element */
  gchar *author;                /* who wrote this thing? */
  gchar *copyright;             /* copyright details (year, etc.) */
};

struct _GstElementFactory {
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  gchar *name;			/* name of element */
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  GType type;			/* unique GType of element */
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  GstElementDetails *details;	/* pointer to details struct */
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  GList *padtemplates;
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  guint16 numpadtemplates;
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};

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void			gst_element_class_add_padtemplate	(GstElementClass *element, GstPadTemplate *templ);

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GType			gst_element_get_type		(void);
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GstElement*		gst_element_new			(void);
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#define			gst_element_destroy(element)	gst_object_destroy (GST_OBJECT (element))
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void			gst_element_set_loop_function	(GstElement *element,
							 GstElementLoopFunction loop);
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void                    gst_element_set_name            (GstElement *element, const gchar *name);
const gchar*            gst_element_get_name            (GstElement *element);

void                    gst_element_set_parent          (GstElement *element, GstObject *parent);
GstObject*              gst_element_get_parent          (GstElement *element);
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void			gst_element_set_sched		(GstElement *element, GstSchedule *sched);
GstSchedule*		gst_element_get_sched		(GstElement *element);
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void			gst_element_add_pad		(GstElement *element, GstPad *pad);
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void			gst_element_remove_pad		(GstElement *element, GstPad *pad);
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GstPad*			gst_element_get_pad		(GstElement *element, const gchar *name);
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GList*			gst_element_get_pad_list	(GstElement *element);
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GList*			gst_element_get_padtemplate_list	(GstElement *element);
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GstPadTemplate*		gst_element_get_padtemplate_by_name	(GstElement *element, const guchar *name);
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void			gst_element_add_ghost_pad	(GstElement *element, GstPad *pad, gchar *name);
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void			gst_element_remove_ghost_pad	(GstElement *element, GstPad *pad);
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GstPad*			gst_element_request_compatible_pad (GstElement *element, GstPadTemplate *templ);
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GstPad*			gst_element_request_pad_by_name	(GstElement *element, const gchar *name);

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void			gst_element_connect		(GstElement *src, const gchar *srcpadname,
							 GstElement *dest, const gchar *destpadname);
void			gst_element_disconnect		(GstElement *src, const gchar *srcpadname,
							 GstElement *dest, const gchar *destpadname);
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void			gst_element_signal_eos		(GstElement *element);


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/* called by the app to set the state of the element */
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gint			gst_element_set_state		(GstElement *element, GstElementState state);
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void			gst_element_error		(GstElement *element, const gchar *error);
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GstElementFactory*	gst_element_get_factory		(GstElement *element);
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/* XML write and read */
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GstElement*		gst_element_restore_thyself	(xmlNodePtr self, GstObject *parent);
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/*
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 *
 * factories stuff
 *
 **/
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GstElementFactory*	gst_elementfactory_new			(const gchar *name,GType type,
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                                                                 GstElementDetails *details);
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void			gst_elementfactory_destroy		(GstElementFactory *elementfactory);
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GstElementFactory*	gst_elementfactory_find			(const gchar *name);
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GList*			gst_elementfactory_get_list		(void);
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void			gst_elementfactory_add_padtemplate	(GstElementFactory *elementfactory,
								 GstPadTemplate *templ);
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gboolean		gst_elementfactory_can_src_caps		(GstElementFactory *factory,
								 GstCaps *caps);
gboolean		gst_elementfactory_can_sink_caps	(GstElementFactory *factory,
								 GstCaps *caps);
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GstElement*		gst_elementfactory_create		(GstElementFactory *factory,
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								 const gchar *name);
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/* FIXME this name is wrong, probably so is the one above it */
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GstElement*		gst_elementfactory_make			(const gchar *factoryname, const gchar *name);
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xmlNodePtr		gst_elementfactory_save_thyself		(GstElementFactory *factory, xmlNodePtr parent);
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GstElementFactory*	gst_elementfactory_load_thyself		(xmlNodePtr parent);
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const gchar *		gst_element_statename			(int state);

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#ifdef __cplusplus
}
#endif /* __cplusplus */


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#endif /* __GST_ELEMENT_H__ */
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