gstbin.h 5.56 KB
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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
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 *
 * 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>
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#include <gst/gstiterator.h>
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#include <gst/gstbus.h>
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G_BEGIN_DECLS

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#define GST_TYPE_BIN             (gst_bin_get_type ())
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#define GST_IS_BIN(obj)          (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_BIN))
#define GST_IS_BIN_CLASS(klass)  (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_BIN))
#define GST_BIN_GET_CLASS(obj)   (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_BIN, GstBinClass))
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#define GST_BIN(obj)             (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_BIN, GstBin))
#define GST_BIN_CLASS(klass)     (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_BIN, GstBinClass))
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#define GST_BIN_CAST(obj)        ((GstBin*)(obj))
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/**
 * GstBinFlags:
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 * @GST_BIN_FLAG_LAST: the last enum in the series of flags for bins.
 * Derived classes can use this as first value in a list of flags.
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 *
 * GstBinFlags are a set of flags specific to bins. Most are set/used
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 * internally. They can be checked using the GST_OBJECT_FLAG_IS_SET () macro,
 * and (un)set using GST_OBJECT_FLAG_SET () and GST_OBJECT_FLAG_UNSET ().
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 */
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typedef enum {
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  /* padding */
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  GST_BIN_FLAG_LAST		= (GST_ELEMENT_FLAG_LAST << 5)
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} GstBinFlags;
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typedef struct _GstBin GstBin;
typedef struct _GstBinClass GstBinClass;
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/**
 * GST_BIN_NUMCHILDREN:
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 * @bin: a #GstBin
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 *
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 * Gets the number of children in a bin.
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 */
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#define GST_BIN_NUMCHILDREN(bin)	(GST_BIN_CAST(bin)->numchildren)
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/**
 * GST_BIN_CHILDREN:
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 * @bin: a #GstBin
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 *
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 * Gets the list with children in a bin.
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 */
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#define GST_BIN_CHILDREN(bin)		(GST_BIN_CAST(bin)->children)
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/**
 * GST_BIN_CHILDREN_COOKIE:
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 * @bin: a #GstBin
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 *
 * Gets the children cookie that watches the children list.
 */
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#define GST_BIN_CHILDREN_COOKIE(bin)	(GST_BIN_CAST(bin)->children_cookie)
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/**
 * GstBin:
 * @numchildren: the number of children in this bin
 * @children: the list of children in this bin
 * @children_cookie: updated whenever @children changes
 * @child_bus: internal bus for handling child messages
 * @messages: queued messages
 * @polling: the bin is currently calculating its state
 * @state_dirty: the bin needs to recalculate its state
 * @clock_dirty: the bin needs to select a new clock
 * @provided_clock: the last clock selected
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 * @clock_provider: the element that provided @provided_clock
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 *
 * The GstBin base class. Subclasses can access these fields provided
 * the LOCK is taken.
 */
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struct _GstBin {
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  GstElement	 element;
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  /*< public >*/ /* with LOCK */
  /* our children, subclass are supposed to update these
   * fields to reflect their state with _iterate_*() */
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  gint		 numchildren;
  GList		*children;
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  guint32	 children_cookie;
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  GstBus        *child_bus;
  GList         *messages;
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  gboolean	 polling;
  gboolean       state_dirty;
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  gboolean       clock_dirty;
  GstClock	*provided_clock;
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  GstElement    *clock_provider;
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  /*< private >*/
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  gpointer _gst_reserved[GST_PADDING];
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};

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/**
 * GstBinClass:
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 * @parent_class: bin parent class
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 * @add_element: method to add an element to a bin
 * @remove_element: method to remove an element from a bin
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 * @handle_message: method to handle a message from the children
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 *
 * Subclasses can override the @add_element and @remove_element to
 * update the list of children in the bin.
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 *
 * The @handle_message method can be overriden to implement custom
 * message handling.
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 */
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struct _GstBinClass {
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  GstElementClass parent_class;

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  /*< private >*/
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  GThreadPool  *pool;

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  /* signals */
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  void		(*element_added)	(GstBin *bin, GstElement *child);
  void		(*element_removed)	(GstBin *bin, GstElement *child);
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  /*< public >*/
  /* virtual methods for subclasses */
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  gboolean	(*add_element)		(GstBin *bin, GstElement *element);
  gboolean	(*remove_element)	(GstBin *bin, GstElement *element);

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  void		(*handle_message)	(GstBin *bin, GstMessage *message);

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  /*< private >*/
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  gpointer _gst_reserved[GST_PADDING];
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};

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GType		gst_bin_get_type		(void);
GstElement*	gst_bin_new			(const gchar *name);
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/* add and remove elements from the bin */
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gboolean	gst_bin_add			(GstBin *bin, GstElement *element);
gboolean	gst_bin_remove			(GstBin *bin, GstElement *element);
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/* retrieve a single child */
GstElement*	gst_bin_get_by_name		 (GstBin *bin, const gchar *name);
GstElement*	gst_bin_get_by_name_recurse_up	 (GstBin *bin, const gchar *name);
GstElement*	gst_bin_get_by_interface	 (GstBin *bin, GType interface);
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/* retrieve multiple children */
GstIterator*    gst_bin_iterate_elements	 (GstBin *bin);
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GstIterator*    gst_bin_iterate_sorted		 (GstBin *bin);
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GstIterator*    gst_bin_iterate_recurse		 (GstBin *bin);

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GstIterator*	gst_bin_iterate_sinks		 (GstBin *bin);
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GstIterator*	gst_bin_iterate_all_by_interface (GstBin *bin, GType interface);

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G_END_DECLS
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#endif /* __GST_BIN_H__ */