gstreamer/gst/gstbin.h

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
*
* gstbin.h: Header for GstBin container 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_BIN_H__
#define __GST_BIN_H__
#include <gst/gstelement.h>
#include <gst/cothreads.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
extern GstElementDetails gst_bin_details;
#define GST_TYPE_BIN \
(gst_bin_get_type())
#define GST_BIN(obj) \
(GTK_CHECK_CAST((obj),GST_TYPE_BIN,GstBin))
#define GST_BIN_CLASS(klass) \
(GTK_CHECK_CLASS_CAST((klass),GST_TYPE_BIN,GstBinClass))
#define GST_IS_BIN(obj) \
(GTK_CHECK_TYPE((obj),GST_TYPE_BIN))
#define GST_IS_BIN_CLASS(obj) \
(GTK_CHECK_CLASS_TYPE((klass),GST_TYPE_BIN))
typedef enum {
/* this bin is a manager of child elements, i.e. a pipeline or thread */
GST_BIN_FLAG_MANAGER = GST_ELEMENT_FLAG_LAST,
/* we prefer to have cothreads when its an option, over chain-based */
GST_BIN_FLAG_PREFER_COTHREADS,
/* padding */
GST_BIN_FLAG_LAST = GST_ELEMENT_FLAG_LAST + 4,
} GstBinFlags;
typedef struct _GstBin GstBin;
typedef struct _GstBinClass GstBinClass;
typedef struct __GstBinChain _GstBinChain;
struct _GstBin {
GstElement element;
/* our children */
gint numchildren;
GList *children;
gint num_eos_providers;
GList *eos_providers;
/* iteration state */
gboolean need_cothreads;
GList *managed_elements;
gint num_managed_elements;
GList *chains;
gint num_chains;
GList *entries;
gint num_entries;
cothread_context *threadcontext;
gboolean use_cothreads;
};
struct _GstBinClass {
GstElementClass parent_class;
/* signals */
void (*object_added) (GstObject *object, GstObject *child);
void (*object_removed) (GstObject *object, GstObject *child);
/* change the state of elements of the given type */
gboolean (*change_state_type) (GstBin *bin,
GstElementState state,
GtkType type);
/* create a plan for the execution of the bin */
void (*create_plan) (GstBin *bin);
void (*schedule) (GstBin *bin);
/* run a full iteration of operation */
void (*iterate) (GstBin *bin);
};
struct __GstBinChain {
GList *elements;
gint num_elements;
GList *entries;
gboolean need_cothreads;
};
GtkType gst_bin_get_type (void);
GstElement* gst_bin_new (const gchar *name);
#define gst_bin_destroy(bin) gst_object_destroy(GST_OBJECT(bin))
/* add and remove elements from the bin */
void gst_bin_add (GstBin *bin,
GstElement *element);
void gst_bin_remove (GstBin *bin,
GstElement *element);
void gst_bin_add_eos_provider (GstBin *bin,
GstElement *element);
void gst_bin_remove_eos_provider (GstBin *bin,
GstElement *element);
/* retrieve a single element or the list of children */
GstElement* gst_bin_get_by_name (GstBin *bin,
const gchar *name);
GList* gst_bin_get_list (GstBin *bin);
void gst_bin_create_plan (GstBin *bin);
void gst_bin_schedule (GstBin *bin);
gboolean gst_bin_set_state_type (GstBin *bin,
GstElementState state,
GtkType type);
void gst_bin_iterate (GstBin *bin);
/* hack FIXME */
void gst_bin_use_cothreads (GstBin *bin,
gboolean enabled);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* __GST_BIN_H__ */