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gstreamer/gst/gstelement.h
Wim Taymans e7f54b1e74 - Added a function to get the currently executing cothread 
Original commit message from CVS:
- Added a function to get the currently executing cothread
- Removed some useless includes
- _interrupt now returns a boolean so the behaviour after the interrupt
can be controlled by the scheduler.
- Added a better way to set/get the default scheduler.
- make thread and pipeline get the default scheduler.
2001-12-27 00:47:41 +00:00

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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
*
* 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__
#include <gst/gstconfig.h>
#include <gst/gsttypes.h>
#include <gst/gstobject.h>
#include <gst/gstpad.h>
#include <gst/gstpluginfeature.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
#define GST_NUM_STATES 4
/* NOTE: this probably should be done with an #ifdef to decide
* whether to safe-cast or to just do the non-checking cast.
*/
#define GST_STATE(obj) (GST_ELEMENT(obj)->current_state)
#define GST_STATE_PENDING(obj) (GST_ELEMENT(obj)->pending_state)
/* 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))
#define GST_STATE_NULL_TO_READY ((GST_STATE_NULL<<8) | GST_STATE_READY)
#define GST_STATE_READY_TO_PAUSED ((GST_STATE_READY<<8) | GST_STATE_PAUSED)
#define GST_STATE_PAUSED_TO_PLAYING ((GST_STATE_PAUSED<<8) | GST_STATE_PLAYING)
#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)
#define GST_STATE_READY_TO_NULL ((GST_STATE_READY<<8) | GST_STATE_NULL)
extern GType _gst_element_type;
#define GST_TYPE_ELEMENT (_gst_element_type)
#define GST_ELEMENT_CAST(obj) ((GstElement*)(obj))
#define GST_ELEMENT_CLASS_CAST(klass) ((GstElementClass*)(klass))
#define GST_IS_ELEMENT(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_ELEMENT))
#define GST_IS_ELEMENT_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_ELEMENT))
#ifdef GST_TYPE_PARANOID
# define GST_ELEMENT(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_ELEMENT, GstElement))
# define GST_ELEMENT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_ELEMENT, GstElementClass))
#else
# define GST_ELEMENT GST_ELEMENT_CAST
# define GST_ELEMENT_CLASS GST_ELEMENT_CLASS_CAST
#endif
typedef enum {
/* element is complex (for some def.) and generally require a cothread */
GST_ELEMENT_COMPLEX = GST_OBJECT_FLAG_LAST,
/* input and output pads aren't directly coupled to each other
examples: queues, multi-output async readers, etc. */
GST_ELEMENT_DECOUPLED,
/* this element should be placed in a thread if at all possible */
GST_ELEMENT_THREAD_SUGGESTED,
/* this element is incable of seeking (FIXME: does this apply to filters?) */
GST_ELEMENT_NO_SEEK,
/* this element, for some reason, has a loop function that performs
* an infinite loop without calls to gst_element_yield () */
GST_ELEMENT_INFINITE_LOOP,
/* private flags that can be used by the scheduler */
GST_ELEMENT_SCHEDULER_PRIVATE1,
GST_ELEMENT_SCHEDULER_PRIVATE2,
/* there is a new loopfunction ready for placement */
GST_ELEMENT_NEW_LOOPFUNC,
/* if this element can handle events */
GST_ELEMENT_EVENT_AWARE,
/* use some padding for future expansion */
GST_ELEMENT_FLAG_LAST = GST_OBJECT_FLAG_LAST + 12,
} GstElementFlags;
#define GST_ELEMENT_IS_THREAD_SUGGESTED(obj) (GST_FLAG_IS_SET(obj,GST_ELEMENT_THREAD_SUGGESTED))
#define GST_ELEMENT_IS_EOS(obj) (GST_FLAG_IS_SET(obj,GST_ELEMENT_EOS))
#define GST_ELEMENT_IS_EVENT_AWARE(obj) (GST_FLAG_IS_SET(obj,GST_ELEMENT_EVENT_AWARE))
#define GST_ELEMENT_IS_DECOUPLED(obj) (GST_FLAG_IS_SET(obj,GST_ELEMENT_DECOUPLED))
#define GST_ELEMENT_NAME(obj) (GST_OBJECT_NAME(obj))
#define GST_ELEMENT_PARENT(obj) (GST_OBJECT_PARENT(obj))
#define GST_ELEMENT_MANAGER(obj) (((GstElement*)(obj))->manager)
#define GST_ELEMENT_SCHED(obj) (((GstElement*)(obj))->sched)
#define GST_ELEMENT_PADS(obj) ((obj)->pads)
/*typedef struct _GstElement GstElement;*/
/*typedef struct _GstElementClass GstElementClass;*/
typedef struct _GstElementFactory GstElementFactory;
typedef struct _GstElementFactoryClass GstElementFactoryClass;
typedef void (*GstElementLoopFunction) (GstElement *element);
struct _GstElement {
GstObject object;
/* element state and scheduling */
guint8 current_state;
guint8 pending_state;
GstElement *manager;
GstElementLoopFunction loopfunc;
GstScheduler *sched;
gpointer sched_private;
/* element pads */
guint16 numpads;
guint16 numsrcpads;
guint16 numsinkpads;
GList *pads;
GstPad *select_pad;
GMutex *state_mutex;
GCond *state_cond;
};
struct _GstElementClass {
GstObjectClass parent_class;
/* the elementfactory that created us */
GstElementFactory *elementfactory;
/* templates for our pads */
GList *padtemplates;
gint numpadtemplates;
/* signal callbacks */
void (*state_change) (GstElement *element, GstElementState old, GstElementState state);
void (*new_pad) (GstElement *element, GstPad *pad);
void (*pad_removed) (GstElement *element, GstPad *pad);
void (*error) (GstElement *element, gchar *error);
void (*event) (GstElement *element, GstEvent *event);
void (*eos) (GstElement *element);
/* local pointers for get/set */
void (*set_property) (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
void (*get_property) (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
/* vtable*/
/* change the element state */
GstElementStateReturn (*change_state) (GstElement *element);
/* request a new pad */
GstPad* (*request_new_pad) (GstElement *element, GstPadTemplate *templ, const gchar* name);
void (*send_event) (GstElement *element, GstEvent *event);
};
void gst_element_class_add_padtemplate (GstElementClass *klass, GstPadTemplate *templ);
GType gst_element_get_type (void);
#define gst_element_destroy(element) gst_object_destroy (GST_OBJECT (element))
void gst_element_set_loop_function (GstElement *element,
GstElementLoopFunction loop);
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);
void gst_element_yield (GstElement *element);
gboolean gst_element_interrupt (GstElement *element);
void gst_element_set_sched (GstElement *element, GstScheduler *sched);
GstScheduler* gst_element_get_sched (GstElement *element);
void gst_element_add_pad (GstElement *element, GstPad *pad);
void gst_element_remove_pad (GstElement *element, GstPad *pad);
GstPad* gst_element_get_pad (GstElement *element, const gchar *name);
GList* gst_element_get_pad_list (GstElement *element);
GList* gst_element_get_padtemplate_list (GstElement *element);
GstPadTemplate* gst_element_get_padtemplate_by_name (GstElement *element, const guchar *name);
void gst_element_add_ghost_pad (GstElement *element, GstPad *pad, gchar *name);
void gst_element_remove_ghost_pad (GstElement *element, GstPad *pad);
GstPad* gst_element_request_compatible_pad (GstElement *element, GstPadTemplate *templ);
GstPad* gst_element_request_pad_by_name (GstElement *element, const gchar *name);
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);
void gst_element_signal_eos (GstElement *element);
void gst_element_send_event (GstElement *element, GstEvent *event);
GstElementState gst_element_get_state (GstElement *element);
gint gst_element_set_state (GstElement *element, GstElementState state);
void gst_element_wait_state_change (GstElement *element);
const gchar* gst_element_statename (GstElementState state);
void gst_element_info (GstElement *element, const gchar *info, ...);
void gst_element_error (GstElement *element, const gchar *error, ...);
GstElementFactory* gst_element_get_factory (GstElement *element);
void gst_element_install_std_props (GstElementClass *klass,
const char *first_name, ...);
#ifndef GST_DISABLE_LOADSAVE
/* XML write and read */
GstElement* gst_element_restore_thyself (xmlNodePtr self, GstObject *parent);
#endif
/*
*
* factories stuff
*
**/
typedef struct _GstElementDetails GstElementDetails;
struct _GstElementDetails {
gchar *longname; /* long, english name */
gchar *klass; /* type of element, as hierarchy */
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.) */
};
#define GST_TYPE_ELEMENTFACTORY (gst_elementfactory_get_type())
#define GST_ELEMENTFACTORY(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_ELEMENTFACTORY,\
GstElementFactory))
#define GST_ELEMENTFACTORY_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ELEMENTFACTORY,\
GstElementFactoryClass))
#define GST_IS_ELEMENTFACTORY(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_ELEMENTFACTORY))
#define GST_IS_ELEMENTFACTORY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_ELEMENTFACTORY))
struct _GstElementFactory {
GstPluginFeature feature;
GType type; /* unique GType of element */
guint details_dynamic : 1;
GstElementDetails *details; /* pointer to details struct */
GList *padtemplates;
guint16 numpadtemplates;
};
struct _GstElementFactoryClass {
GstPluginFeatureClass parent_class;
};
GType gst_elementfactory_get_type (void);
GstElementFactory* gst_elementfactory_new (const gchar *name,GType type,
GstElementDetails *details);
GstElementFactory* gst_elementfactory_find (const gchar *name);
const GList* gst_elementfactory_get_list (void);
void gst_elementfactory_add_padtemplate (GstElementFactory *elementfactory,
GstPadTemplate *templ);
gboolean gst_elementfactory_can_src_caps (GstElementFactory *factory,
GstCaps *caps);
gboolean gst_elementfactory_can_sink_caps (GstElementFactory *factory,
GstCaps *caps);
GstElement* gst_elementfactory_create (GstElementFactory *factory,
const gchar *name);
/* FIXME this name is wrong, probably so is the one above it */
GstElement* gst_elementfactory_make (const gchar *factoryname, const gchar *name);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* __GST_ELEMENT_H__ */
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