gstreamermm
1.4.3
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A base class for the GStreamer object hierarchy. More...
Public Member Functions | |
virtual | ~Object () |
GstObject* | gobj () |
Provides access to the underlying C GObject. More... | |
const GstObject* | gobj () const |
Provides access to the underlying C GObject. More... | |
GstObject* | gobj_copy () |
Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs. More... | |
bool | is_element () const |
bool | is_element_factory () const |
bool | is_pad () const |
bool | is_pad_template () const |
bool | is_bin () const |
guint32 | get_flags () const |
Returns the entire set of flags for the object. More... | |
bool | set_name (const Glib::ustring& name) |
Sets the name of object, or gives object a guaranteed unique name (if name is 0 ). More... | |
Glib::ustring | get_name () const |
Returns a copy of the name of object. More... | |
bool | set_parent (const Glib::RefPtr< Gst::Object >& parent) |
Sets the parent of object to parent. More... | |
Glib::RefPtr< Gst::Object > | get_parent () |
Returns the parent of object. More... | |
Glib::RefPtr< const Gst::Object > | get_parent () const |
Returns the parent of object. More... | |
void | unparent () |
Clear the parent of object, removing the associated reference. More... | |
bool | has_ancestor (const Glib::RefPtr< const Gst::Object >& ancestor) const |
Check if object has an ancestor ancestor somewhere up in the hierarchy. More... | |
Glib::ustring | get_path_string () |
Generates a string describing the path of object in the object hierarchy. More... | |
Glib::PropertyProxy < Glib::ustring > | property_name () |
The name of the object. More... | |
Glib::PropertyProxy_ReadOnly < Glib::ustring > | property_name () const |
The name of the object. More... | |
Glib::SignalProxy2< void, const Glib::RefPtr< Object > &, GParamSpec* > | signal_deep_notify () |
int | get_refcount () const |
Static Public Member Functions | |
static GType | get_type () |
Get the GType for this class, for use with the underlying GObject type system. More... | |
static bool | check_uniqueness (const Glib::ListHandle< const Gst::Object >& list, const Glib::ustring& name) |
Checks to see if there is any object named name in list. More... | |
Protected Member Functions | |
virtual void | on_deep_notify (const Glib::RefPtr< Object >& prop_object, GParamSpec* prop) |
This is a default handler for the signal signal_deep_notify(). More... | |
Related Functions | |
(Note that these are not member functions.) | |
Glib::RefPtr< Gst::Object > | wrap (GstObject* object, bool take_copy=false) |
A Glib::wrap() method for this object. More... | |
A base class for the GStreamer object hierarchy.
Gst::Object provides a root for the object hierarchy tree filed in by the GStreamer library. It is currently a thin wrapper on top of Glib::Object. It is an abstract class that is not very usable on its own.
Gst::Object gives us basic refcounting, parenting functionality and locking. Most of the function are just extended for special GStreamer needs and can be found under the same name in the base class of Gst::Object which is Glib::Object (e.g. Glib::Object::reference() becomes Gst:Object::reference().
In contrast to Glib::Object instances, Gst::Object adds a name property. The functions set_name() and get_name() are used to set/get the name of the object.
Last reviewed on 2005-11-09 (0.9.4)
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virtual |
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static |
Checks to see if there is any object named name in list.
This function does not do any locking of any kind. You might want to protect the provided list with the lock of the owner of the list. This function will lock each Gst::Object in the list to compare the name, so be carefull when passing a list with a locked object.
list | A list of Gst::Object to check through. |
name | The name to search for. |
true
if a Gst::Object named name does not appear in list, false
if it does.MT safe. Grabs and releases the LOCK of each object in the list.
guint32 Gst::Object::get_flags | ( | ) | const |
Returns the entire set of flags for the object.
Glib::ustring Gst::Object::get_name | ( | ) | const |
Returns a copy of the name of object.
Caller should Glib::free() the return value after usage. For a nameless object, this returns 0
, which you can safely Glib::free() as well.
Free-function: g_free
MT safe. This function grabs and releases object's LOCK.
Glib::RefPtr<Gst::Object> Gst::Object::get_parent | ( | ) |
Returns the parent of object.
This function increases the refcount of the parent object so you should unref() it after usage.
0
if object has no parent. unref after usage.MT safe. Grabs and releases object's LOCK.
Glib::RefPtr<const Gst::Object> Gst::Object::get_parent | ( | ) | const |
Returns the parent of object.
This function increases the refcount of the parent object so you should unref() it after usage.
0
if object has no parent. unref after usage.MT safe. Grabs and releases object's LOCK.
Glib::ustring Gst::Object::get_path_string | ( | ) |
Generates a string describing the path of object in the object hierarchy.
Only useful (or used) for debugging.
Free-function: g_free
MT safe. Grabs and releases the Gst::Object's LOCK for all objects in the hierarchy.
int Gst::Object::get_refcount | ( | ) | const |
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static |
Get the GType for this class, for use with the underlying GObject type system.
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inline |
Provides access to the underlying C GObject.
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inline |
Provides access to the underlying C GObject.
GstObject* Gst::Object::gobj_copy | ( | ) |
Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs.
bool Gst::Object::has_ancestor | ( | const Glib::RefPtr< const Gst::Object >& | ancestor | ) | const |
Check if object has an ancestor ancestor somewhere up in the hierarchy.
One can e.g. check if a Gst::Element is inside a Gst::Pipeline.
ancestor | A Gst::Object to check as ancestor. |
true
if ancestor is an ancestor of object.MT safe. Grabs and releases object's locks.
bool Gst::Object::is_bin | ( | ) | const |
bool Gst::Object::is_element | ( | ) | const |
bool Gst::Object::is_element_factory | ( | ) | const |
bool Gst::Object::is_pad | ( | ) | const |
bool Gst::Object::is_pad_template | ( | ) | const |
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protectedvirtual |
This is a default handler for the signal signal_deep_notify().
Glib::PropertyProxy< Glib::ustring > Gst::Object::property_name | ( | ) |
The name of the object.
You rarely need to use properties because there are get_ and set_ methods for almost all of them.
Glib::PropertyProxy_ReadOnly< Glib::ustring > Gst::Object::property_name | ( | ) | const |
The name of the object.
You rarely need to use properties because there are get_ and set_ methods for almost all of them.
bool Gst::Object::set_name | ( | const Glib::ustring & | name | ) |
Sets the name of object, or gives object a guaranteed unique name (if name is 0
).
This function makes a copy of the provided name, so the caller retains ownership of the name it sent.
name | New name of object. |
true
if the name could be set. Since Objects that have a parent cannot be renamed, this function returns false
in those cases.MT safe. This function grabs and releases object's LOCK.
bool Gst::Object::set_parent | ( | const Glib::RefPtr< Gst::Object >& | parent | ) |
Sets the parent of object to parent.
The object's reference count will be incremented, and any floating reference will be removed (see ref_sink()).
parent | New parent of object. |
true
if parent could be set or false
when object already had a parent or object and parent are the same.MT safe. Grabs and releases object's LOCK.
Glib::SignalProxy2< void,const Glib::RefPtr<Object>&,GParamSpec* > Gst::Object::signal_deep_notify | ( | ) |
void on_my_deep_notify(const Glib::RefPtr<Object>& prop_object, GParamSpec* prop)
The deep notify signal is used to be notified of property changes. It is typically attached to the toplevel bin to receive notifications from all the elements contained in that bin.
prop_object | The object that originated the signal. |
prop | The property that changed. |
void Gst::Object::unparent | ( | ) |
Clear the parent of object, removing the associated reference.
This function decreases the refcount of object.
MT safe. Grabs and releases object's lock.
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related |
A Glib::wrap() method for this object.
object | The C instance. |
take_copy | False if the result should take ownership of the C instance. True if it should take a new copy or ref. |