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GstTimedValueControlSource
GstTimedValueControlSource — timed value control source base class
Functions
Signals
Types and Values
Object Hierarchy
GObject ╰── GInitiallyUnowned ╰── GstObject ╰── GstControlSource ╰── GstTimedValueControlSource ├── GstInterpolationControlSource ╰── GstTriggerControlSource
Includes
#include <libs/controller/controller.h>
Description
Base class for GstControlSource that use time-stamped values.
When overriding bind, chain up first to give this bind implementation a chance to setup things.
All functions are MT-safe.
Functions
gst_timed_value_control_source_find_control_point_iter ()
GSequenceIter * gst_timed_value_control_source_find_control_point_iter (GstTimedValueControlSource *self,GstClockTime timestamp);
Find last value before given timestamp in control point list.
If all values in the control point list come after the given
timestamp or no values exist, NULL is returned.
For use in control source implementations.
Parameters
self
the control source to search in
timestamp
the search key
gst_timed_value_control_source_set ()
gboolean gst_timed_value_control_source_set (GstTimedValueControlSource *self,GstClockTime timestamp,const gdouble value);
Set the value of given controller-handled property at a certain time.
Parameters
self
the GstTimedValueControlSource object
timestamp
the time the control-change is scheduled for
value
the control-value
Returns
FALSE if the values couldn't be set, TRUE otherwise.
gst_timed_value_control_source_set_from_list ()
gboolean gst_timed_value_control_source_set_from_list (GstTimedValueControlSource *self,const GSList *timedvalues);
Sets multiple timed values at once.
Parameters
self
the GstTimedValueControlSource object
Returns
FALSE if the values couldn't be set, TRUE otherwise.
gst_timed_value_control_source_get_all ()
GList *
gst_timed_value_control_source_get_all
(GstTimedValueControlSource *self);
Returns a read-only copy of the list of GstTimedValue for the given property. Free the list after done with it.
Parameters
self
the GstTimedValueControlSource to get the list from
Returns
a copy
of the list, or NULL if the property isn't handled by the controller.
[transfer container][element-type GstTimedValue]
gst_timed_value_control_source_unset ()
gboolean gst_timed_value_control_source_unset (GstTimedValueControlSource *self,GstClockTime timestamp);
Used to remove the value of given controller-handled property at a certain time.
Parameters
self
the GstTimedValueControlSource object
timestamp
the time the control-change should be removed from
Returns
FALSE if the value couldn't be unset (i.e. not found, TRUE otherwise.
gst_timed_value_control_source_unset_all ()
void
gst_timed_value_control_source_unset_all
(GstTimedValueControlSource *self);
Used to remove all time-stamped values of given controller-handled property
Parameters
self
the GstTimedValueControlSource object
gst_timed_value_control_source_get_count ()
gint
gst_timed_value_control_source_get_count
(GstTimedValueControlSource *self);
Get the number of control points that are set.
Parameters
self
the GstTimedValueControlSource to get the number of values from
Returns
the number of control points that are set.
gst_timed_value_control_invalidate_cache ()
void
gst_timed_value_control_invalidate_cache
(GstTimedValueControlSource *self);
Reset the controlled value cache.
Parameters
self
Types and Values
struct GstTimedValueControlSource
struct GstTimedValueControlSource;
The instance structure of GstControlSource.
struct GstControlPoint
struct GstControlPoint {
/* fields from GstTimedValue. DO NOT CHANGE! */
GstClockTime timestamp;
gdouble value;
};
An internal structure for value+time and various temporary values used for interpolation. This "inherits" from GstTimedValue.
Members
Signal Details
The "value-added" signal
void user_function (GstTimedValueControlSource *self, GstControlPoint *timed_value, gpointer user_data)
Emited right after the new value has been added to self
Parameters
self
The GstTimedValueControlSource into which a GstTimedValue has been added
timed_value
The newly added GstTimedValue
user_data
user data set when the signal handler was connected.
Flags: Run First
Since: 1.6
The "value-changed" signal
void user_function (GstTimedValueControlSource *self, GstControlPoint *timed_value, gpointer user_data)
Emited right after the new value has been set on timed_signals
Parameters
self
The GstTimedValueControlSource on which a GstTimedValue has changed
timed_value
The GstTimedValue where the value changed
user_data
user data set when the signal handler was connected.
Flags: Run First
Since: 1.6
The "value-removed" signal
void user_function (GstTimedValueControlSource *self, GstControlPoint *timed_value, gpointer user_data)
Emited when timed_value
is removed from self
Parameters
self
The GstTimedValueControlSource from which a GstTimedValue has been removed
timed_value
The removed GstTimedValue
user_data
user data set when the signal handler was connected.
Flags: Run First
Since: 1.6
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