gstreamer/gst/autoplug/gstspider.h

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/* GStreamer
* Copyright (C) 2002 Erik Walthinsen <omega@cse.ogi.edu>
* 2002 Wim Taymans <wtay@chello.be>
*
* gstspider.h: Header for GstSpider 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_SPIDER_H__
#define __GST_SPIDER_H__
#include <gst/gst.h>
#include "gstspideridentity.h"
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
extern GstElementDetails gst_spider_details;
/**
* Theory of operation:
* When connecting a sink to a source, GstSpiderConnections are used to keep track
* of the current status of the connection. sink -> src is the path we intend to
* plug. current is how far we've come. If current equals
* - NULL, there is no possible path,
* - src, the connection is established.
* - sink, it wasn't tried to establish a connection.
* - something else, we have come that far while plugging.
* signal_id is used to remember the signal_id when we are waiting for a "new_pad"
* callback during connection.
* When a path is established, the elements in the path (excluding sink and src)
* are refcounted once for every path.
* A GstSpider keeps a list of all GstSpiderConnections in it.
*/
typedef struct {
GstSpiderIdentity *sink;
GstSpiderIdentity *src;
/* dunno if the path should stay here or if its too much load.
* it's at least easier then always searching it */
GList *path;
GstElement *current;
gulong signal_id;
} GstSpiderConnection;
#define GST_TYPE_SPIDER \
(gst_spider_get_type())
#define GST_SPIDER(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_SPIDER,GstSpider))
#define GST_SPIDER_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_SPIDER,GstSpiderClass))
#define GST_IS_SPIDER(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_SPIDER))
#define GST_IS_SPIDER_CLASS(obj) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_SPIDER))
typedef struct _GstSpider GstSpider;
typedef struct _GstSpiderClass GstSpiderClass;
struct _GstSpider {
GstBin parent;
GList * factories; /* factories to use for plugging */
GList * connections; /* GStSpiderConnection list of all connections */
};
struct _GstSpiderClass {
GstBinClass parent_class;
};
/* default initialization stuff */
GType gst_spider_get_type (void);
/* private connection functions to be called by GstSpiderIdentity */
void gst_spider_identity_plug (GstSpiderIdentity *ident);
void gst_spider_identity_unplug (GstSpiderIdentity *ident);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* __GST_SPIDER_H__ */