The #GESExtractable object type that can be extracted from the asset.
The ID of the asset. This should be unique amongst all assets with the same #GESAsset:extractable-type. Depending on the associated #GESExtractable implementation, this id may convey some information about the #GObject that should be extracted. Note that, as such, the ID will have an expected format, and you can not choose this value arbitrarily. By default, this will be set to the type name of the #GESAsset:extractable-type, but you should check the documentation of the extractable type to see whether they differ from the default behaviour.
The default proxy for this asset, or %NULL if it has no proxy. A proxy will act as a substitute for the original asset when the original is requested (see ges_asset_request()).
Setting this property will not usually remove the existing proxy, but will replace it as the default (see ges_asset_set_proxy()).
The asset that this asset is a proxy for, or %NULL if it is not a proxy for another asset.
Note that even if this asset is acting as a proxy for another asset,
but this asset is not the default #GESAsset:proxy, then proxy-target
will still point to this other asset. So you should check the
#GESAsset:proxy property of target-proxy before assuming it is the
current default proxy for the target.
Note that the #GObject::notify for this property is emitted after the #GESAsset:proxy #GObject::notify for the corresponding (if any) asset it is now the proxy of/no longer the proxy of.
The formats supported by the asset.
Deserializes the given string, and adds and sets the found fields and their values on the container. The string should be the return of ges_meta_container_metas_to_string().
A string to deserialize and add to container
Creates a binding between source_property on source and target_property
on target.
Whenever the source_property is changed the target_property is
updated using the same value. For instance:
g_object_bind_property (action, "active", widget, "sensitive", 0);
Will result in the "sensitive" property of the widget #GObject instance to be updated with the same value of the "active" property of the action #GObject instance.
If flags contains %G_BINDING_BIDIRECTIONAL then the binding will be mutual:
if target_property on target changes then the source_property on source
will be updated as well.
The binding will automatically be removed when either the source or the
target instances are finalized. To remove the binding without affecting the
source and the target you can just call g_object_unref() on the returned
#GBinding instance.
Removing the binding by calling g_object_unref() on it must only be done if
the binding, source and target are only used from a single thread and it
is clear that both source and target outlive the binding. Especially it
is not safe to rely on this if the binding, source or target can be
finalized from different threads. Keep another reference to the binding and
use g_binding_unbind() instead to be on the safe side.
A #GObject can have multiple bindings.
the property on source to bind
the target #GObject
the property on target to bind
flags to pass to #GBinding
Creates a binding between source_property on source and target_property
on target, allowing you to set the transformation functions to be used by
the binding.
This function is the language bindings friendly version of g_object_bind_property_full(), using #GClosures instead of function pointers.
the property on source to bind
the target #GObject
the property on target to bind
flags to pass to #GBinding
a #GClosure wrapping the transformation function from the source to the target, or %NULL to use the default
a #GClosure wrapping the transformation function from the target to the source, or %NULL to use the default
Checks whether the specified field has been registered as static, and gets the registered type and flags of the field, as used in ges_meta_container_register_meta() and ges_meta_container_register_static_meta().
The key for the container field to check
Extracts a new #GESAsset:extractable-type object from the asset. The #GESAsset:id of the asset may determine the properties and state of the newly created object.
This function is intended for #GObject implementations to re-enforce a [floating][floating-ref] object reference. Doing this is seldom required: all #GInitiallyUnowneds are created with a floating reference which usually just needs to be sunken by calling g_object_ref_sink().
Calls the given function on each of the meta container's set metadata fields.
A function to call on each of container's set metadata fields
Increases the freeze count on object. If the freeze count is
non-zero, the emission of "notify" signals on object is
stopped. The signals are queued until the freeze count is decreased
to zero. Duplicate notifications are squashed so that at most one
#GObject::notify signal is emitted for each property modified while the
object is frozen.
This is necessary for accessors that modify multiple properties to prevent premature notification while the object is still being modified.
Gets the current boolean value of the specified field of the meta container. If the field does not have a set value, or it is of the wrong type, the method will fail.
The key for the container field to get
Gets a named field from the objects table of associations (see g_object_set_data()).
name of the key for that association
Gets the current double value of the specified field of the meta container. If the field does not have a set value, or it is of the wrong type, the method will fail.
The key for the container field to get
Gets the #GESAsset:extractable-type of the asset.
Gets the current float value of the specified field of the meta container. If the field does not have a set value, or it is of the wrong type, the method will fail.
The key for the container field to get
Converts the given frame number into a timestamp, using the "natural" frame rate of the asset.
You can use this to reference a specific frame in a media file and use this
as, for example, the in-point or max-duration of a #GESClip.
The frame number we want the internal time coordinate timestamp of
Gets the #GESAsset:id of the asset.
Gets the current int value of the specified field of the meta container. If the field does not have a set value, or it is of the wrong type, the method will fail.
The key for the container field to get
Gets the current int64 value of the specified field of the meta container. If the field does not have a set value, or it is of the wrong type, the method will fail.
The key for the container field to get
Gets the current marker list value of the specified field of the meta container. If the field does not have a set value, or it is of the wrong type, the method will fail.
The key for the container field to get
Gets the current value of the specified field of the meta container.
The key for the container field to get
Result: %TRUE if self has a natural framerate %FALSE otherwise
Gets a property of an object.
The value can be:
In general, a copy is made of the property contents and the caller is responsible for freeing the memory by calling g_value_unset().
Note that g_object_get_property() is really intended for language bindings, g_object_get() is much more convenient for C programming.
the name of the property to get
return location for the property value
Gets the default #GESAsset:proxy of the asset.
Gets the #GESAsset:proxy-target of the asset.
Note that the proxy target may have loaded with an error, so you should call ges_asset_get_error() on the returned target.
This function gets back user data pointers stored via g_object_set_qdata().
A #GQuark, naming the user data pointer
Gets the current string value of the specified field of the meta container. If the field does not have a set value, or it is of the wrong type, the method will fail.
The key for the container field to get
Gets track types for which objects extracted from self can create #GESTrackElement
Gets the current uint value of the specified field of the meta container. If the field does not have a set value, or it is of the wrong type, the method will fail.
The key for the container field to get
Gets the current uint64 value of the specified field of the meta container. If the field does not have a set value, or it is of the wrong type, the method will fail.
The key for the container field to get
Gets n_properties properties for an object.
Obtained properties will be set to values. All properties must be valid.
Warnings will be emitted and undefined behaviour may result if invalid
properties are passed in.
the names of each property to get
the values of each property to get
Initializes the object implementing the interface.
This method is intended for language bindings. If writing in C, g_initable_new() should typically be used instead.
The object must be initialized before any real use after initial construction, either with this function or g_async_initable_init_async().
Implementations may also support cancellation. If cancellable is not %NULL,
then initialization can be cancelled by triggering the cancellable object
from another thread. If the operation was cancelled, the error
%G_IO_ERROR_CANCELLED will be returned. If cancellable is not %NULL and
the object doesn't support cancellable initialization the error
%G_IO_ERROR_NOT_SUPPORTED will be returned.
If the object is not initialized, or initialization returns with an error, then all operations on the object except g_object_ref() and g_object_unref() are considered to be invalid, and have undefined behaviour. See the [introduction][ginitable] for more details.
Callers should not assume that a class which implements #GInitable can be initialized multiple times, unless the class explicitly documents itself as supporting this. Generally, a class’ implementation of init() can assume (and assert) that it will only be called once. Previously, this documentation recommended all #GInitable implementations should be idempotent; that recommendation was relaxed in GLib 2.54.
If a class explicitly supports being initialized multiple times, it is recommended that the method is idempotent: multiple calls with the same arguments should return the same results. Only the first call initializes the object; further calls return the result of the first call.
One reason why a class might need to support idempotent initialization is if it is designed to be used via the singleton pattern, with a #GObjectClass.constructor that sometimes returns an existing instance. In this pattern, a caller would expect to be able to call g_initable_init() on the result of g_object_new(), regardless of whether it is in fact a new instance.
optional #GCancellable object, %NULL to ignore.
Starts asynchronous initialization of the object implementing the interface. This must be done before any real use of the object after initial construction. If the object also implements #GInitable you can optionally call g_initable_init() instead.
This method is intended for language bindings. If writing in C, g_async_initable_new_async() should typically be used instead.
When the initialization is finished, callback will be called. You can
then call g_async_initable_init_finish() to get the result of the
initialization.
Implementations may also support cancellation. If cancellable is not
%NULL, then initialization can be cancelled by triggering the cancellable
object from another thread. If the operation was cancelled, the error
%G_IO_ERROR_CANCELLED will be returned. If cancellable is not %NULL, and
the object doesn't support cancellable initialization, the error
%G_IO_ERROR_NOT_SUPPORTED will be returned.
As with #GInitable, if the object is not initialized, or initialization returns with an error, then all operations on the object except g_object_ref() and g_object_unref() are considered to be invalid, and have undefined behaviour. They will often fail with g_critical() or g_warning(), but this must not be relied on.
Callers should not assume that a class which implements #GAsyncInitable can be initialized multiple times; for more information, see g_initable_init(). If a class explicitly supports being initialized multiple times, implementation requires yielding all subsequent calls to init_async() on the results of the first call.
For classes that also support the #GInitable interface, the default implementation of this method will run the g_initable_init() function in a thread, so if you want to support asynchronous initialization via threads, just implement the #GAsyncInitable interface without overriding any interface methods.
the [I/O priority][io-priority] of the operation
optional #GCancellable object, %NULL to ignore.
a #GAsyncReadyCallback to call when the request is satisfied
Finishes asynchronous initialization and returns the result. See g_async_initable_init_async().
a #GAsyncResult.
Checks whether object has a [floating][floating-ref] reference.
Get all the proxies that the asset has. The first item of the list will be the default #GESAsset:proxy. The second will be the proxy that is 'next in line' to be default, and so on.
Serializes the set metadata fields of the meta container to a string.
Finishes the async construction for the various g_async_initable_new calls, returning the created object or %NULL on error.
the #GAsyncResult from the callback
Emits a "notify" signal for the property property_name on object.
When possible, eg. when signaling a property change from within the class that registered the property, you should use g_object_notify_by_pspec() instead.
Note that emission of the notify signal may be blocked with g_object_freeze_notify(). In this case, the signal emissions are queued and will be emitted (in reverse order) when g_object_thaw_notify() is called.
the name of a property installed on the class of object.
Emits a "notify" signal for the property specified by pspec on object.
This function omits the property name lookup, hence it is faster than g_object_notify().
One way to avoid using g_object_notify() from within the class that registered the properties, and using g_object_notify_by_pspec() instead, is to store the GParamSpec used with g_object_class_install_property() inside a static array, e.g.:
enum
{
PROP_0,
PROP_FOO,
PROP_LAST
};
static GParamSpec *properties[PROP_LAST];
static void
my_object_class_init (MyObjectClass *klass)
{
properties[PROP_FOO] = g_param_spec_int ("foo", "Foo", "The foo",
0, 100,
50,
G_PARAM_READWRITE);
g_object_class_install_property (gobject_class,
PROP_FOO,
properties[PROP_FOO]);
}
and then notify a change on the "foo" property with:
g_object_notify_by_pspec (self, properties[PROP_FOO]);
the #GParamSpec of a property installed on the class of object.
Increase the reference count of object, and possibly remove the
[floating][floating-ref] reference, if object has a floating reference.
In other words, if the object is floating, then this call "assumes ownership" of the floating reference, converting it to a normal reference by clearing the floating flag while leaving the reference count unchanged. If the object is not floating, then this call adds a new normal reference increasing the reference count by one.
Since GLib 2.56, the type of object will be propagated to the return type
under the same conditions as for g_object_ref().
Sets the value of the specified field of the meta container to the
given value, and registers the field to only hold a value of the
same type. After calling this, only values of the same type as value
can be set for this field. The given flags can be set to make this
field only readable after calling this method.
Flags to be used for the registered field
The key for the container field to register
The value to set for the registered field
Sets the value of the specified field of the meta container to the given boolean value, and registers the field to only hold a boolean typed value. After calling this, only boolean values can be set for this field. The given flags can be set to make this field only readable after calling this method.
Flags to be used for the registered field
The key for the container field to register
The value to set for the registered field
Sets the value of the specified field of the meta container to the given date value, and registers the field to only hold a date typed value. After calling this, only date values can be set for this field. The given flags can be set to make this field only readable after calling this method.
Flags to be used for the registered field
The key for the container field to register
The value to set for the registered field
Sets the value of the specified field of the meta container to the given date time value, and registers the field to only hold a date time typed value. After calling this, only date time values can be set for this field. The given flags can be set to make this field only readable after calling this method.
Flags to be used for the registered field
The key for the container field to register
The value to set for the registered field
Sets the value of the specified field of the meta container to the given double value, and registers the field to only hold a double typed value. After calling this, only double values can be set for this field. The given flags can be set to make this field only readable after calling this method.
Flags to be used for the registered field
The key for the container field to register
The value to set for the registered field
Sets the value of the specified field of the meta container to the given float value, and registers the field to only hold a float typed value. After calling this, only float values can be set for this field. The given flags can be set to make this field only readable after calling this method.
Flags to be used for the registered field
The key for the container field to register
The value to set for the registered field
Sets the value of the specified field of the meta container to the given int value, and registers the field to only hold an int typed value. After calling this, only int values can be set for this field. The given flags can be set to make this field only readable after calling this method.
Flags to be used for the registered field
The key for the container field to register
The value to set for the registered field
Sets the value of the specified field of the meta container to the given int64 value, and registers the field to only hold an int64 typed value. After calling this, only int64 values can be set for this field. The given flags can be set to make this field only readable after calling this method.
Flags to be used for the registered field
The key for the container field to register
The value to set for the registered field
Sets the value of the specified field of the meta container to the given string value, and registers the field to only hold a string typed value. After calling this, only string values can be set for this field. The given flags can be set to make this field only readable after calling this method.
Flags to be used for the registered field
The key for the container field to register
The value to set for the registered field
Sets the value of the specified field of the meta container to the given uint value, and registers the field to only hold a uint typed value. After calling this, only uint values can be set for this field. The given flags can be set to make this field only readable after calling this method.
Flags to be used for the registered field
The key for the container field to register
The value to set for the registered field
Sets the value of the specified field of the meta container to the given uint64 value, and registers the field to only hold a uint64 typed value. After calling this, only uint64 values can be set for this field. The given flags can be set to make this field only readable after calling this method.
Flags to be used for the registered field
The key for the container field to register
The value to set for the registered field
Registers a static metadata field on the container to only hold the specified type. After calling this, setting a value under this field can only succeed if its type matches the registered type of the field.
Unlike ges_meta_container_register_meta(), no (initial) value is set for this field, which means you can use this method to reserve the space to be optionally set later.
Note that if a value has already been set for the field being
registered, then its type must match the registering type, and its
value will be left in place. If the field has no set value, then
you will likely want to include #GES_META_WRITABLE in flags to allow
the value to be set later.
Flags to be used for the registered field
The key for the container field to register
The required value type for the registered field
Releases all references to other objects. This can be used to break reference cycles.
This function should only be called from object system implementations.
Sets the value of the specified field of the meta container to the given boolean value.
The key for the container field to set
The value to set under meta_item
Each object carries around a table of associations from strings to pointers. This function lets you set an association.
If the object already had an association with that name, the old association will be destroyed.
Internally, the key is converted to a #GQuark using g_quark_from_string().
This means a copy of key is kept permanently (even after object has been
finalized) — so it is recommended to only use a small, bounded set of values
for key in your program, to avoid the #GQuark storage growing unbounded.
name of the key
data to associate with that key
Sets the value of the specified field of the meta container to the given double value.
The key for the container field to set
The value to set under meta_item
Sets the value of the specified field of the meta container to the given float value.
The key for the container field to set
The value to set under meta_item
Sets the value of the specified field of the meta container to the given int value.
The key for the container field to set
The value to set under meta_item
Sets the value of the specified field of the meta container to the given int64 value.
The key for the container field to set
The value to set under meta_item
Sets the value of the specified field of the meta container to the given marker list value.
The key for the container field to set
The value to set under meta_item
Sets the value of the specified field of the meta container to a
copy of the given value. If the given value is %NULL, the field
given by meta_item is removed and %TRUE is returned.
The key for the container field to set
The value to set under meta_item, or %NULL to remove the corresponding field
Sets a property on an object.
the name of the property to set
the value
Sets the #GESAsset:proxy for the asset.
If proxy is among the existing proxies of the asset (see
ges_asset_list_proxies()) it will be moved to become the default
proxy. Otherwise, if proxy is not %NULL, it will be added to the list
of proxies, as the new default. The previous default proxy will become
'next in line' for if the new one is removed, and so on. As such, this
will not actually remove the previous default proxy (use
ges_asset_unproxy() for that).
Note that an asset can only act as a proxy for one other asset.
As a special case, if proxy is %NULL, then this method will actually
remove all proxies from the asset.
A new default proxy for asset
Sets the value of the specified field of the meta container to the given string value.
The key for the container field to set
The value to set under meta_item
Sets track types for which objects extracted from self can create #GESTrackElement
The track types supported by the GESClipAsset
Sets the value of the specified field of the meta container to the given uint value.
The key for the container field to set
The value to set under meta_item
Sets the value of the specified field of the meta container to the given uint64 value.
The key for the container field to set
The value to set under meta_item
Remove a specified datum from the object's data associations, without invoking the association's destroy handler.
name of the key
This function gets back user data pointers stored via
g_object_set_qdata() and removes the data from object
without invoking its destroy() function (if any was
set).
Usually, calling this function is only required to update
user data pointers with a destroy notifier, for example:
void
object_add_to_user_list (GObject *object,
const gchar *new_string)
{
// the quark, naming the object data
GQuark quark_string_list = g_quark_from_static_string ("my-string-list");
// retrieve the old string list
GList *list = g_object_steal_qdata (object, quark_string_list);
// prepend new string
list = g_list_prepend (list, g_strdup (new_string));
// this changed 'list', so we need to set it again
g_object_set_qdata_full (object, quark_string_list, list, free_string_list);
}
static void
free_string_list (gpointer data)
{
GList *node, *list = data;
for (node = list; node; node = node->next)
g_free (node->data);
g_list_free (list);
}
Using g_object_get_qdata() in the above example, instead of g_object_steal_qdata() would have left the destroy function set, and thus the partial string list would have been freed upon g_object_set_qdata_full().
A #GQuark, naming the user data pointer
Reverts the effect of a previous call to
g_object_freeze_notify(). The freeze count is decreased on object
and when it reaches zero, queued "notify" signals are emitted.
Duplicate notifications for each property are squashed so that at most one #GObject::notify signal is emitted for each property, in the reverse order in which they have been queued.
It is an error to call this function when the freeze count is zero.
Removes the proxy from the available list of proxies for the asset. If the given proxy is the default proxy of the list, then the next proxy in the available list (see ges_asset_list_proxies()) will become the default. If there are no other proxies, then the asset will no longer have a default #GESAsset:proxy.
An existing proxy of asset
Decreases the reference count of object. When its reference count
drops to 0, the object is finalized (i.e. its memory is freed).
If the pointer to the #GObject may be reused in future (for example, if it is an instance variable of another object), it is recommended to clear the pointer to %NULL rather than retain a dangling pointer to a potentially invalid #GObject instance. Use g_clear_object() for this.
This function essentially limits the life time of the closure to
the life time of the object. That is, when the object is finalized,
the closure is invalidated by calling g_closure_invalidate() on
it, in order to prevent invocations of the closure with a finalized
(nonexisting) object. Also, g_object_ref() and g_object_unref() are
added as marshal guards to the closure, to ensure that an extra
reference count is held on object during invocation of the
closure. Usually, this function will be called on closures that
use this object as closure data.
#GClosure to watch
Find the #GParamSpec with the given name for an
interface. Generally, the interface vtable passed in as g_iface
will be the default vtable from g_type_default_interface_ref(), or,
if you know the interface has already been loaded,
g_type_default_interface_peek().
any interface vtable for the interface, or the default vtable for the interface
name of a property to look up.
Add a property to an interface; this is only useful for interfaces that are added to GObject-derived types. Adding a property to an interface forces all objects classes with that interface to have a compatible property. The compatible property could be a newly created #GParamSpec, but normally g_object_class_override_property() will be used so that the object class only needs to provide an implementation and inherits the property description, default value, bounds, and so forth from the interface property.
This function is meant to be called from the interface's default
vtable initialization function (the class_init member of
#GTypeInfo.) It must not be called after after class_init has
been called for any object types implementing this interface.
If pspec is a floating reference, it will be consumed.
any interface vtable for the interface, or the default vtable for the interface.
the #GParamSpec for the new property
Lists the properties of an interface.Generally, the interface
vtable passed in as g_iface will be the default vtable from
g_type_default_interface_ref(), or, if you know the interface has
already been loaded, g_type_default_interface_peek().
any interface vtable for the interface, or the default vtable for the interface
Indicate that an existing #GESAsset in the cache should be reloaded upon the next request. This can be used when some condition has changed, which may require that an existing asset should be updated. For example, if an external resource has changed or now become available.
Note, the asset is not immediately changed, but will only actually reload on the next call to ges_asset_request() or ges_asset_request_async().
The #GESAsset:extractable-type of the asset that needs reloading
The #GESAsset:id of the asset asset that needs reloading
Creates a new instance of a #GObject subtype and sets its properties.
Construction parameters (see %G_PARAM_CONSTRUCT, %G_PARAM_CONSTRUCT_ONLY) which are not explicitly specified are set to their default values.
the type id of the #GObject subtype to instantiate
an array of #GParameter
Returns an asset with the given properties. If such an asset already exists in the cache (it has been previously created in GES), then a reference to the existing asset is returned. Otherwise, a newly created asset is returned, and also added to the cache.
If the requested asset has been loaded with an error, then error is
set, if given, and %NULL will be returned instead.
Note that the given id may not be exactly the #GESAsset:id that is
set on the returned asset. For instance, it may be adjusted into a
standard format. Or, if a #GESExtractable type does not have its
extraction parametrised, as is the case by default, then the given id
may be ignored entirely and the #GESAsset:id set to some standard, in
which case a %NULL id can be given.
Similarly, the given extractable_type may not be exactly the
#GESAsset:extractable-type that is set on the returned asset. Instead,
the actual extractable type may correspond to a subclass of the given
extractable_type, depending on the given id.
Moreover, depending on the given extractable_type, the returned asset
may belong to a subclass of #GESAsset.
Finally, if the requested asset has a #GESAsset:proxy, then the proxy that is found at the end of the chain of proxies is returned (a proxy's proxy will take its place, and so on, unless it has no proxy).
Some asset subclasses only support asynchronous construction of its assets, such as #GESUriClip. For such assets this method will fail, and you should use ges_asset_request_async() instead. In the case of #GESUriClip, you can use ges_uri_clip_asset_request_sync() if you only want to wait for the request to finish.
The #GESAsset:extractable-type of the asset
The #GESAsset:id of the asset
Requests an asset with the given properties asynchronously (see ges_asset_request()). When the asset has been initialized or fetched from the cache, the given callback function will be called. The asset can then be retrieved in the callback using the ges_asset_request_finish() method on the given #GAsyncResult.
Note that the source object passed to the callback will be the #GESAsset corresponding to the request, but it may not have loaded correctly and therefore can not be used as is. Instead, ges_asset_request_finish() should be used to fetch a usable asset, or indicate that an error occurred in the asset's creation.
Note that the callback will be called in the #GMainLoop running under the same #GMainContext that ges_init() was called in. So, if you wish the callback to be invoked outside the default #GMainContext, you can call g_main_context_push_thread_default() in a new thread before calling ges_init().
Example of an asynchronous asset request:
// The request callback
static void
asset_loaded_cb (GESAsset * source, GAsyncResult * res, gpointer user_data)
{
GESAsset *asset;
GError *error = NULL;
asset = ges_asset_request_finish (res, &error);
if (asset) {
gst_print ("The file: %s is usable as a GESUriClip",
ges_asset_get_id (asset));
} else {
gst_print ("The file: %s is *not* usable as a GESUriClip because: %s",
ges_asset_get_id (source), error->message);
}
gst_object_unref (asset);
}
// The request:
ges_asset_request_async (GES_TYPE_URI_CLIP, some_uri, NULL,
(GAsyncReadyCallback) asset_loaded_cb, user_data);
The #GESAsset:extractable-type of the asset
The #GESAsset:id of the asset
An object to allow cancellation of the asset request, or %NULL to ignore
A function to call when the initialization is finished
Fetches an asset requested by ges_asset_request_async(), which finalises the request.
The task result to fetch the asset from
An asset types from which #GESSourceClip will be extracted