gstreamer/gst/gstelement.h
Erik Walthinsen a46c5a73f0 More massive changes to the scheduling system. Moved the scheduling code to gstscheduler.[ch], so an child bin can r...
Original commit message from CVS:
More massive changes to the scheduling system.  Moved the scheduling code
to gstscheduler.[ch], so an child bin can replace the scheduler.
Introduced the concept of chains, which are subsets of the list of managed
elements for a given manager bin, which get scheduled as separate entities.
gst_bin_iterate_func should be pretty much fixed now, the scheduling code
gets to do all the hard work.

Cothreaded case work in the couple tests I've tried, chained is next.
2000-12-26 23:51:04 +00:00

247 lines
8.2 KiB
C

/* 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_ELEMENT_H__
#define __GST_ELEMENT_H__
#include <gnome-xml/parser.h>
#include <gst/gstlog.h>
#include <gst/gstobject.h>
#include <gst/gstpad.h>
#include <gst/cothreads.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
typedef enum {
GST_STATE_NONE_PENDING = -1,
GST_STATE_NULL = 0,
GST_STATE_READY = 1,
GST_STATE_PLAYING = 2,
GST_STATE_PAUSED = 3,
} GstElementState;
typedef enum {
GST_STATE_FAILURE = 0,
GST_STATE_SUCCESS = 1,
GST_STATE_ASYNC = 2,
} GstElementStateReturn;
static inline char *_gst_print_statename(int state) {
switch (state) {
case -1: return "none pending";break;
case 0: return "null";break;
case 1: return "ready";break;
case 2: return "playing";break;
case 3: return "paused";break;
default: return "";
}
return "";
}
#define GST_STATE(obj) (GST_ELEMENT(obj)->current_state)
#define GST_STATE_PENDING(obj) (GST_ELEMENT(obj)->pending_state)
#define GST_STATE_TRANSITION(obj) ((GST_STATE(obj)<<4) | GST_STATE_PENDING(obj))
#define GST_STATE_NULL_TO_READY ((GST_STATE_NULL<<4) | GST_STATE_READY)
#define GST_STATE_READY_TO_PLAYING ((GST_STATE_READY<<4) | GST_STATE_PLAYING)
#define GST_STATE_PLAYING_TO_PAUSED ((GST_STATE_PLAYING<<4) | GST_STATE_PAUSED)
#define GST_STATE_PAUSED_TO_PLAYING ((GST_STATE_PAUSED<<4) | GST_STATE_PLAYING)
#define GST_STATE_PLAYING_TO_READY ((GST_STATE_PLAYING<<4) | GST_STATE_READY)
#define GST_STATE_READY_TO_NULL ((GST_STATE_READY<<4) | GST_STATE_NULL)
#define GST_TYPE_ELEMENT \
(gst_element_get_type())
#define GST_ELEMENT(obj) \
(GTK_CHECK_CAST((obj),GST_TYPE_ELEMENT,GstElement))
#define GST_ELEMENT_CLASS(klass) \
(GTK_CHECK_CLASS_CAST((klass),GST_TYPE_ELEMENT,GstElementClass))
#define GST_IS_ELEMENT(obj) \
(GTK_CHECK_TYPE((obj),GST_TYPE_ELEMENT))
#define GST_IS_ELEMENT_CLASS(klass) \
(GTK_CHECK_CLASS_TYPE((klass),GST_TYPE_ELEMENT))
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,
// there is a new loopfunction ready for placement
GST_ELEMENT_NEW_LOOPFUNC,
// the cothread holding this element needs to be stopped
GST_ELEMENT_COTHREAD_STOPPING,
// the element has to be scheduled as a cothread for any sanity
GST_ELEMENT_USE_COTHREAD,
/* use some padding for future expansion */
GST_ELEMENT_FLAG_LAST = GST_OBJECT_FLAG_LAST + 8,
} GstElementFlags;
#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))
typedef struct _GstElement GstElement;
typedef struct _GstElementClass GstElementClass;
typedef struct _GstElementDetails GstElementDetails;
typedef struct _GstElementFactory GstElementFactory;
typedef void (*GstElementLoopFunction) (GstElement *element);
struct _GstElement {
GstObject object;
gchar *name;
guint8 current_state;
guint8 pending_state;
GstElementLoopFunction loopfunc;
cothread_state *threadstate;
guint16 numpads;
guint16 numsrcpads;
guint16 numsinkpads;
GList *pads;
GstElement *manager;
};
struct _GstElementClass {
GstObjectClass parent_class;
/* the elementfactory that created us */
GstElementFactory *elementfactory;
/* signal callbacks */
void (*state_change) (GstElement *element,GstElementState state);
void (*new_pad) (GstElement *element,GstPad *pad);
void (*new_ghost_pad) (GstElement *element,GstPad *pad);
void (*error) (GstElement *element,gchar *error);
/* events */
// gboolean (*start) (GstElement *element,GstElementState state);
// gboolean (*stop) (GstElement *element);
/* change the element state */
GstElementStateReturn (*change_state) (GstElement *element);
/* create or read XML representation of self */
xmlNodePtr (*save_thyself) (GstElement *element, xmlNodePtr parent);
void (*restore_thyself) (GstElement *element, xmlNodePtr self, GHashTable *elements);
};
struct _GstElementDetails {
gchar *longname; /* long, english name */
gchar *klass; /* type of element, kinda */
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 {
gchar *name; /* name of element */
GtkType type; /* unique GtkType of element */
GstElementDetails *details; /* pointer to details struct */
GList *padtemplates;
};
GtkType gst_element_get_type (void);
GstElement* gst_element_new (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, gchar *name);
const gchar* gst_element_get_name (GstElement *element);
void gst_element_set_manager (GstElement *element, GstElement *manager);
GstElement* gst_element_get_manager (GstElement *element);
void gst_element_add_pad (GstElement *element, GstPad *pad);
GstPad* gst_element_get_pad (GstElement *element, gchar *name);
GList* gst_element_get_pad_list (GstElement *element);
void gst_element_add_ghost_pad (GstElement *element, GstPad *pad);
void gst_element_connect (GstElement *src, gchar *srcpadname,
GstElement *dest, gchar *destpadname);
/* called by the app to set the state of the element */
gint gst_element_set_state (GstElement *element, GstElementState state);
void gst_element_error (GstElement *element, gchar *error);
GstElementFactory* gst_element_get_factory (GstElement *element);
int gst_element_loopfunc_wrapper (int argc,char **argv);
/* XML write and read */
xmlNodePtr gst_element_save_thyself (GstElement *element, xmlNodePtr parent);
GstElement* gst_element_load_thyself (xmlNodePtr parent, GHashTable *elements);
/*
*
* factories stuff
*
**/
GstElementFactory* gst_elementfactory_new (gchar *name,GtkType type,
GstElementDetails *details);
void gst_elementfactory_destroy (GstElementFactory *elementfactory);
void gst_elementfactory_add_padtemplate (GstElementFactory *elementfactory,
GstPadTemplate *pad);
GstElementFactory* gst_elementfactory_find (gchar *name);
GList* gst_elementfactory_get_list (void);
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,
gchar *name);
// FIXME this name is wrong, probably so is the one above it
GstElement* gst_elementfactory_make (gchar *factoryname, gchar *name);
xmlNodePtr gst_elementfactory_save_thyself (GstElementFactory *factory, xmlNodePtr parent);
GstElementFactory* gst_elementfactory_load_thyself (xmlNodePtr parent);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* __GST_ELEMENT_H__ */