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98 lines
3.2 KiB
C
98 lines
3.2 KiB
C
/* GStreamer
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* Copyright (C) 2002 Erik Walthinsen <omega@cse.ogi.edu>
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* 2002 Wim Taymans <wtay@chello.be>
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*
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* gstspider.h: Header for GstSpider object
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __GST_SPIDER_H__
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#define __GST_SPIDER_H__
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#include <gst/gst.h>
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#include "gstspideridentity.h"
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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extern GstElementDetails gst_spider_details;
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/*
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* Theory of operation:
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* When connecting a sink to a source, GstSpiderConnections are used to keep track
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* of the current status of the connection. sink -> src is the path we intend to
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* plug. current is how far we've come. If current equals
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* - NULL, there is no possible path,
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* - src, the connection is established.
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* - sink, it wasn't tried to establish a connection.
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* - something else, we have come that far while plugging.
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* signal_id is used to remember the signal_id when we are waiting for a "new_pad"
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* callback during connection.
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* When a path is established, the elements in the path (excluding sink and src)
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* are refcounted once for every path.
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* A GstSpider keeps a list of all GstSpiderConnections in it.
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*/
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typedef struct {
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GstSpiderIdentity *sink;
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GstSpiderIdentity *src;
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/* dunno if the path should stay here or if its too much load.
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* it's at least easier then always searching it */
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GList *path;
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GstElement *current;
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gulong signal_id;
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} GstSpiderConnection;
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#define GST_TYPE_SPIDER \
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(gst_spider_get_type())
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#define GST_SPIDER(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_SPIDER,GstSpider))
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#define GST_SPIDER_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_SPIDER,GstSpiderClass))
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#define GST_IS_SPIDER(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_SPIDER))
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#define GST_IS_SPIDER_CLASS(obj) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_SPIDER))
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typedef struct _GstSpider GstSpider;
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typedef struct _GstSpiderClass GstSpiderClass;
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struct _GstSpider {
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GstBin parent;
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GList * factories; /* factories to use for plugging */
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GList * connections; /* GStSpiderConnection list of all connections */
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};
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struct _GstSpiderClass {
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GstBinClass parent_class;
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};
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/* default initialization stuff */
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GType gst_spider_get_type (void);
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/* private connection functions to be called by GstSpiderIdentity */
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void gst_spider_identity_plug (GstSpiderIdentity *ident);
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void gst_spider_identity_unplug (GstSpiderIdentity *ident);
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* __GST_SPIDER_H__ */
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