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204 lines
6.4 KiB
C
204 lines
6.4 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wtay@chello.be>
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*
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* gstbin.h: Header for GstBin container 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_BIN_H__
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#define __GST_BIN_H__
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#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))
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#define GST_IS_BIN_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_BIN))
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#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))
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#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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/**
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* GstBinFlags:
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* @GST_BIN_FLAG_NO_RESYNC: don't resync a state change when elements are
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* added or linked in the bin (Since 1.0.5)
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* @GST_BIN_FLAG_LAST: the last enum in the series of flags for bins.
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* Derived classes can use this as first value in a list of flags.
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*
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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,
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* 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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GST_BIN_FLAG_NO_RESYNC = (GST_ELEMENT_FLAG_LAST << 0),
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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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/**
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* GST_BIN_IS_NO_RESYNC:
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* @bin: A #GstBin
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*
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* Check if @bin will resync its state change when elements are added and
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* removed.
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*
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* Since: 1.0.5
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*/
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#define GST_BIN_IS_NO_RESYNC(bin) (GST_OBJECT_FLAG_IS_SET(bin,GST_BIN_FLAG_NO_RESYNC))
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typedef struct _GstBin GstBin;
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typedef struct _GstBinClass GstBinClass;
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typedef struct _GstBinPrivate GstBinPrivate;
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/**
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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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/**
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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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/**
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* GST_BIN_CHILDREN_COOKIE:
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* @bin: a #GstBin
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*
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* Gets the children cookie that watches the children list.
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*/
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#define GST_BIN_CHILDREN_COOKIE(bin) (GST_BIN_CAST(bin)->children_cookie)
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/**
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* GstBin:
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* @numchildren: the number of children in this bin
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* @children: (element-type Gst.Element): the list of children in this bin
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* @children_cookie: updated whenever @children changes
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* @child_bus: internal bus for handling child messages
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* @messages: (element-type Gst.Message): queued and cached messages
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* @polling: the bin is currently calculating its state
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* @state_dirty: the bin needs to recalculate its state (deprecated)
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* @clock_dirty: the bin needs to select a new clock
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* @provided_clock: the last clock selected
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* @clock_provider: the element that provided @provided_clock
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*
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* The GstBin base class. Subclasses can access these fields provided
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* the LOCK is taken.
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*/
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struct _GstBin {
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GstElement element;
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/*< public >*/ /* with LOCK */
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/* our children, subclass are supposed to update these
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* fields to reflect their state with _iterate_*() */
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gint numchildren;
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GList *children;
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guint32 children_cookie;
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GstBus *child_bus;
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GList *messages;
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gboolean polling;
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gboolean state_dirty;
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gboolean clock_dirty;
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GstClock *provided_clock;
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GstElement *clock_provider;
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/*< private >*/
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GstBinPrivate *priv;
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gpointer _gst_reserved[GST_PADDING];
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};
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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
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* @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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*
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* Subclasses can override the @add_element and @remove_element to
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* update the list of children in the bin.
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*
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* The @handle_message method can be overridden to implement custom
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* message handling. @handle_message takes ownership of the message, just like
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* #gst_element_post_message.
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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);
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void (*element_removed) (GstBin *bin, GstElement *child);
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/*< public >*/
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/* virtual methods for subclasses */
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gboolean (*add_element) (GstBin *bin, GstElement *element);
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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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/* signal */
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gboolean (*do_latency) (GstBin *bin);
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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);
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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);
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gboolean gst_bin_remove (GstBin *bin, GstElement *element);
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/* retrieve a single child */
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GstElement* gst_bin_get_by_name (GstBin *bin, const gchar *name);
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GstElement* gst_bin_get_by_name_recurse_up (GstBin *bin, const gchar *name);
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GstElement* gst_bin_get_by_interface (GstBin *bin, GType iface);
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/* retrieve multiple children */
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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_sources (GstBin *bin);
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GstIterator* gst_bin_iterate_all_by_interface (GstBin *bin, GType iface);
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/* latency */
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gboolean gst_bin_recalculate_latency (GstBin * bin);
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G_END_DECLS
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#endif /* __GST_BIN_H__ */
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