/* 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., 51 Franklin St, Fifth Floor,

 * Boston, MA 02110-1301, USA.

 */

#ifndef __GST_BIN_H__

#define __GST_BIN_H__

#include <gst/gstelement.h>

#include <gst/gstiterator.h>

#include <gst/gstbus.h>

G_BEGIN_DECLS

#define GST_TYPE_BIN             (gst_bin_get_type ())

#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))

#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))

#define GST_BIN_CAST(obj)        ((GstBin*)(obj))

/**

 * GstBinFlags:

 * @GST_BIN_FLAG_NO_RESYNC: don't resync a state change when elements are

 *             added or linked in the bin (Since 1.0.5)

 * @GST_BIN_FLAG_STREAMS_AWARE: Indicates whether the bin can handle elements

 *             that add/remove source pads at any point in time without

 *             first posting a no-more-pads signal (Since 1.10)

 * @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.

 *

 * GstBinFlags are a set of flags specific to bins. Most are set/used

 * 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 ().

 */

typedef enum {

  GST_BIN_FLAG_NO_RESYNC	= (GST_ELEMENT_FLAG_LAST << 0),

  GST_BIN_FLAG_STREAMS_AWARE	= (GST_ELEMENT_FLAG_LAST << 1),

  /* padding */

  GST_BIN_FLAG_LAST		= (GST_ELEMENT_FLAG_LAST << 5)

} GstBinFlags;

/**

 * GST_BIN_IS_NO_RESYNC:

 * @bin: A #GstBin

 *

 * Check if @bin will resync its state change when elements are added and

 * removed.

 *

 * Since: 1.0.5

 */

#define GST_BIN_IS_NO_RESYNC(bin)        (GST_OBJECT_FLAG_IS_SET(bin,GST_BIN_FLAG_NO_RESYNC))

typedef struct _GstBin GstBin;

typedef struct _GstBinClass GstBinClass;

typedef struct _GstBinPrivate GstBinPrivate;

/**

 * GST_BIN_NUMCHILDREN:

 * @bin: a #GstBin

 *

 * Gets the number of children in a bin.

 */

#define GST_BIN_NUMCHILDREN(bin)	(GST_BIN_CAST(bin)->numchildren)

/**

 * GST_BIN_CHILDREN:

 * @bin: a #GstBin

 *

 * Gets the list with children in a bin.

 */

#define GST_BIN_CHILDREN(bin)		(GST_BIN_CAST(bin)->children)

/**

 * GST_BIN_CHILDREN_COOKIE:

 * @bin: a #GstBin

 *

 * Gets the children cookie that watches the children list.

 */

#define GST_BIN_CHILDREN_COOKIE(bin)	(GST_BIN_CAST(bin)->children_cookie)

/**

 * GstBin:

 * @numchildren: the number of children in this bin

 * @children: (element-type Gst.Element): the list of children in this bin

 * @children_cookie: updated whenever @children changes

 * @child_bus: internal bus for handling child messages

 * @messages: (element-type Gst.Message): queued and cached messages

 * @polling: the bin is currently calculating its state

 * @state_dirty: the bin needs to recalculate its state (deprecated)

 * @clock_dirty: the bin needs to select a new clock

 * @provided_clock: the last clock selected

 * @clock_provider: the element that provided @provided_clock

 *

 * The GstBin base class. Subclasses can access these fields provided

 * the LOCK is taken.

 */

struct _GstBin {

  GstElement	 element;

  /*< public >*/ /* with LOCK */

  /* our children, subclass are supposed to update these

   * fields to reflect their state with _iterate_*() */

  gint		 numchildren;

  GList		*children;

  guint32	 children_cookie;

  GstBus        *child_bus;

  GList         *messages;

  gboolean	 polling;

  gboolean       state_dirty;

  gboolean       clock_dirty;

  GstClock	*provided_clock;

  GstElement    *clock_provider;

  /*< private >*/

  GstBinPrivate *priv;

  gpointer _gst_reserved[GST_PADDING];

};

/**

 * GstBinClass:

 * @parent_class: bin parent class

 * @add_element: method to add an element to a bin

 * @remove_element: method to remove an element from a bin

 * @handle_message: method to handle a message from the children

 * @deep_element_added: method called when an element was added somewhere

 *     in the bin hierarchy

 * @deep_element_removed: method called when an element was removed somewhere

 *     in the bin hierarchy

 *

 * Subclasses can override the @add_element and @remove_element to

 * update the list of children in the bin.

 *

 * The @handle_message method can be overridden to implement custom

 * message handling.  @handle_message takes ownership of the message, just like

 * #gst_element_post_message.

 *

 * The @deep_element_added vfunc will be called when a new element has been

 * added to any bin inside this bin, so it will also be called if a new child

 * was added to a sub-bin of this bin. #GstBin implementations that override

 * this message should chain up to the parent class implementation so the

 * element-added-deep signal is emitted on all parents.

 */

struct _GstBinClass {

  GstElementClass parent_class;

  /*< private >*/

  GThreadPool  *pool; /* deprecated */

  /* signals */

  void		(*element_added)	(GstBin *bin, GstElement *child);

  void		(*element_removed)	(GstBin *bin, GstElement *child);

  /*< public >*/

  /* virtual methods for subclasses */

  gboolean	(*add_element)		(GstBin *bin, GstElement *element);

  gboolean	(*remove_element)	(GstBin *bin, GstElement *element);

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

  /*< private >*/

  /* signal */

  gboolean	(*do_latency)           (GstBin *bin);

  /*< public >*/

  /* signal */

  void          (*deep_element_added)   (GstBin *bin, GstBin *sub_bin, GstElement *child);

  void          (*deep_element_removed) (GstBin *bin, GstBin *sub_bin, GstElement *child);

  /*< private >*/

  gpointer _gst_reserved[GST_PADDING-2];

};

GST_API

GType		gst_bin_get_type		(void);

GST_API

GstElement*	gst_bin_new			(const gchar *name);

/* add and remove elements from the bin */

GST_API

gboolean	gst_bin_add			(GstBin *bin, GstElement *element);

GST_API

gboolean	gst_bin_remove			(GstBin *bin, GstElement *element);

/* retrieve a single child */

GST_API

GstElement*	gst_bin_get_by_name		 (GstBin *bin, const gchar *name);

GST_API

GstElement*	gst_bin_get_by_name_recurse_up	 (GstBin *bin, const gchar *name);

GST_API

GstElement*	gst_bin_get_by_interface	 (GstBin *bin, GType iface);

/* retrieve multiple children */

GST_API

GstIterator*    gst_bin_iterate_elements	 (GstBin *bin);

GST_API

GstIterator*    gst_bin_iterate_sorted		 (GstBin *bin);

GST_API

GstIterator*    gst_bin_iterate_recurse		 (GstBin *bin);

GST_API

GstIterator*	gst_bin_iterate_sinks		 (GstBin *bin);

GST_API

GstIterator*	gst_bin_iterate_sources		 (GstBin *bin);

GST_API

GstIterator*	gst_bin_iterate_all_by_interface (GstBin *bin, GType iface);

/* latency */

GST_API

gboolean        gst_bin_recalculate_latency      (GstBin * bin);

/* set and get suppressed flags */

GST_API

void            gst_bin_set_suppressed_flags (GstBin * bin, GstElementFlags flags);

GST_API

GstElementFlags gst_bin_get_suppressed_flags (GstBin * bin);

#ifdef G_DEFINE_AUTOPTR_CLEANUP_FUNC

G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstBin, gst_object_unref)

#endif

G_END_DECLS

#endif /* __GST_BIN_H__ */