*
* 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., 59 Temple Place - Suite 330,
- * Boston, MA 02111-1307, USA.
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
*/
/**
* SECTION:gstcontrolbinding
+ * @title: GstControlBinding
* @short_description: attachment for control source sources
*
- * A value mapping object that attaches control sources to gobject properties.
+ * A base class for value mapping objects that attaches control sources to gobject
+ * properties. Such an object is taking one or more #GstControlSource instances,
+ * combines them and maps the resulting value to the type and value range of the
+ * bound property.
+ */
+/* FIXME(ensonic): should we make gst_object_add_control_binding() internal
+ * - we create the control_binding for a certain object anyway
+ * - we could call gst_object_add_control_binding() at the end of
+ * gst_control_binding_constructor()
+ * - the weak-ref on object is not nice, as is the same as gst_object_parent()
+ * once the object is added to the parent
+ *
+ * - another option would be to defer what is done in _constructor to when
+ * the parent is set (need to listen to the signal then)
+ * then basically I could
+ * a) remove the obj arg and wait the binding to be added or
+ * b) add the binding from constructor, unref object there and make obj
+ * writeonly
*/
#include "gst_private.h"
#include <math.h>
+struct _GstControlBindingPrivate
+{
+ GWeakRef object;
+};
+
#define GST_CAT_DEFAULT control_binding_debug
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
static void gst_control_binding_finalize (GObject * object);
G_DEFINE_ABSTRACT_TYPE_WITH_CODE (GstControlBinding, gst_control_binding,
- GST_TYPE_OBJECT, _do_init);
+ GST_TYPE_OBJECT, G_ADD_PRIVATE (GstControlBinding) _do_init);
enum
{
}
static void
-gst_control_binding_init (GstControlBinding * self)
+gst_control_binding_init (GstControlBinding * binding)
{
+ binding->ABI.abi.priv = gst_control_binding_get_instance_private (binding);
+ g_weak_ref_init (&binding->ABI.abi.priv->object, NULL);
}
static GObject *
gst_control_binding_constructor (GType type, guint n_construct_params,
GObjectConstructParam * construct_params)
{
- GstControlBinding *self;
+ GstControlBinding *binding;
GParamSpec *pspec;
+ GstObject *object;
- self = GST_CONTROL_BINDING (G_OBJECT_CLASS (gst_control_binding_parent_class)
+ binding =
+ GST_CONTROL_BINDING (G_OBJECT_CLASS (gst_control_binding_parent_class)
->constructor (type, n_construct_params, construct_params));
- GST_INFO_OBJECT (self->object, "trying to put property '%s' under control",
- self->name);
+ object = g_weak_ref_get (&binding->ABI.abi.priv->object);
+ if (!object) {
+ GST_WARNING_OBJECT (object, "no object set");
+ return (GObject *) binding;
+ }
+
+ GST_INFO_OBJECT (object, "trying to put property '%s' under control",
+ binding->name);
/* check if the object has a property of that name */
if ((pspec =
- g_object_class_find_property (G_OBJECT_GET_CLASS (self->object),
- self->name))) {
- GST_DEBUG_OBJECT (self->object, " psec->flags : 0x%08x", pspec->flags);
+ g_object_class_find_property (G_OBJECT_GET_CLASS (object),
+ binding->name))) {
+ GST_DEBUG_OBJECT (object, " psec->flags : 0x%08x", pspec->flags);
/* check if this param is witable && controlable && !construct-only */
if ((pspec->flags & (G_PARAM_WRITABLE | GST_PARAM_CONTROLLABLE |
G_PARAM_CONSTRUCT_ONLY)) ==
(G_PARAM_WRITABLE | GST_PARAM_CONTROLLABLE)) {
- self->pspec = pspec;
+ binding->pspec = pspec;
+ } else {
+ GST_WARNING_OBJECT (object,
+ "property '%s' on class '%s' needs to "
+ "be writeable, controlable and not construct_only", binding->name,
+ G_OBJECT_TYPE_NAME (object));
}
} else {
- GST_WARNING_OBJECT (self->object, "class '%s' has no property '%s'",
- G_OBJECT_TYPE_NAME (self->object), self->name);
+ GST_WARNING_OBJECT (object, "class '%s' has no property '%s'",
+ G_OBJECT_TYPE_NAME (object), binding->name);
}
- return (GObject *) self;
+
+ gst_object_unref (object);
+
+ return (GObject *) binding;
}
static void
{
GstControlBinding *self = GST_CONTROL_BINDING (object);
- if (self->object)
- gst_object_replace (&self->object, NULL);
+ /* we did not took a reference */
+ g_object_remove_weak_pointer ((GObject *) self->__object,
+ (gpointer *) & self->__object);
+ self->__object = NULL;
+ g_weak_ref_clear (&self->ABI.abi.priv->object);
+
+ ((GObjectClass *) gst_control_binding_parent_class)->dispose (object);
}
static void
GstControlBinding *self = GST_CONTROL_BINDING (object);
g_free (self->name);
+
+ ((GObjectClass *) gst_control_binding_parent_class)->finalize (object);
}
static void
switch (prop_id) {
case PROP_OBJECT:
- self->object = g_value_dup_object (value);
+ /* do not ref to avoid a ref cycle */
+ self->__object = g_value_get_object (value);
+ g_object_add_weak_pointer ((GObject *) self->__object,
+ (gpointer *) & self->__object);
+
+ g_weak_ref_set (&self->ABI.abi.priv->object, self->__object);
break;
case PROP_NAME:
self->name = g_value_dup_string (value);
switch (prop_id) {
case PROP_OBJECT:
- g_value_set_object (value, self->object);
+ g_value_take_object (value, g_weak_ref_get (&self->ABI.abi.priv->object));
break;
case PROP_NAME:
g_value_set_string (value, self->name);
/**
* gst_control_binding_sync_values:
- * @self: the control binding
+ * @binding: the control binding
* @object: the object that has controlled properties
* @timestamp: the time that should be processed
* @last_sync: the last time this was called
* property, %FALSE otherwise
*/
gboolean
-gst_control_binding_sync_values (GstControlBinding * self, GstObject * object,
- GstClockTime timestamp, GstClockTime last_sync)
+gst_control_binding_sync_values (GstControlBinding * binding,
+ GstObject * object, GstClockTime timestamp, GstClockTime last_sync)
{
GstControlBindingClass *klass;
gboolean ret = FALSE;
- g_return_val_if_fail (GST_IS_CONTROL_BINDING (self), FALSE);
+ g_return_val_if_fail (GST_IS_CONTROL_BINDING (binding), FALSE);
- if (self->disabled)
+ if (binding->disabled)
return TRUE;
- klass = GST_CONTROL_BINDING_GET_CLASS (self);
+ klass = GST_CONTROL_BINDING_GET_CLASS (binding);
if (G_LIKELY (klass->sync_values != NULL)) {
- ret = klass->sync_values (self, object, timestamp, last_sync);
+ ret = klass->sync_values (binding, object, timestamp, last_sync);
} else {
- GST_WARNING_OBJECT (self, "missing sync_values implementation");
+ GST_WARNING_OBJECT (binding, "missing sync_values implementation");
}
return ret;
}
/**
* gst_control_binding_get_value:
- * @self: the control binding
+ * @binding: the control binding
* @timestamp: the time the control-change should be read from
*
* Gets the value for the given controlled property at the requested time.
*
- * Returns: the GValue of the property at the given time, or %NULL if the
- * property isn't controlled.
+ * Returns: (nullable): the GValue of the property at the given time,
+ * or %NULL if the property isn't controlled.
*/
GValue *
-gst_control_binding_get_value (GstControlBinding * self, GstClockTime timestamp)
+gst_control_binding_get_value (GstControlBinding * binding,
+ GstClockTime timestamp)
{
GstControlBindingClass *klass;
GValue *ret = NULL;
- g_return_val_if_fail (GST_IS_CONTROL_BINDING (self), NULL);
+ g_return_val_if_fail (GST_IS_CONTROL_BINDING (binding), NULL);
g_return_val_if_fail (GST_CLOCK_TIME_IS_VALID (timestamp), NULL);
- klass = GST_CONTROL_BINDING_GET_CLASS (self);
+ klass = GST_CONTROL_BINDING_GET_CLASS (binding);
if (G_LIKELY (klass->get_value != NULL)) {
- ret = klass->get_value (self, timestamp);
+ ret = klass->get_value (binding, timestamp);
} else {
- GST_WARNING_OBJECT (self, "missing get_value implementation");
+ GST_WARNING_OBJECT (binding, "missing get_value implementation");
}
return ret;
}
/**
- * gst_control_binding_get_value_array:
- * @self: the control binding
+ * gst_control_binding_get_value_array: (skip)
+ * @binding: the control binding
* @timestamp: the time that should be processed
* @interval: the time spacing between subsequent values
* @n_values: the number of values
- * @values: array to put control-values in
+ * @values: (array length=n_values): array to put control-values in
*
- * Gets a number of values for the given controllered property starting at the
+ * Gets a number of values for the given controlled property starting at the
* requested time. The array @values need to hold enough space for @n_values of
* the same type as the objects property's type.
*
* This function is useful if one wants to e.g. draw a graph of the control
* curve or apply a control curve sample by sample.
*
+ * The values are unboxed and ready to be used. The similar function
+ * gst_control_binding_get_g_value_array() returns the array as #GValues and is
+ * more suitable for bindings.
+ *
* Returns: %TRUE if the given array could be filled, %FALSE otherwise
*/
gboolean
-gst_control_binding_get_value_array (GstControlBinding * self,
+gst_control_binding_get_value_array (GstControlBinding * binding,
GstClockTime timestamp, GstClockTime interval, guint n_values,
- GValue * values)
+ gpointer values)
{
GstControlBindingClass *klass;
gboolean ret = FALSE;
- g_return_val_if_fail (GST_IS_CONTROL_BINDING (self), FALSE);
+ g_return_val_if_fail (GST_IS_CONTROL_BINDING (binding), FALSE);
g_return_val_if_fail (GST_CLOCK_TIME_IS_VALID (timestamp), FALSE);
g_return_val_if_fail (GST_CLOCK_TIME_IS_VALID (interval), FALSE);
g_return_val_if_fail (values, FALSE);
- klass = GST_CONTROL_BINDING_GET_CLASS (self);
+ klass = GST_CONTROL_BINDING_GET_CLASS (binding);
if (G_LIKELY (klass->get_value_array != NULL)) {
- ret = klass->get_value_array (self, timestamp, interval, n_values, values);
+ ret =
+ klass->get_value_array (binding, timestamp, interval, n_values, values);
+ } else {
+ GST_WARNING_OBJECT (binding, "missing get_value_array implementation");
+ }
+ return ret;
+}
+
+#define CONVERT_ARRAY(type,TYPE) \
+{ \
+ g##type *v = g_new (g##type,n_values); \
+ ret = gst_control_binding_get_value_array (binding, timestamp, interval, \
+ n_values, v); \
+ if (ret) { \
+ for (i = 0; i < n_values; i++) { \
+ g_value_init (&values[i], G_TYPE_##TYPE); \
+ g_value_set_##type (&values[i], v[i]); \
+ } \
+ } \
+ g_free (v); \
+}
+
+/**
+ * gst_control_binding_get_g_value_array:
+ * @binding: the control binding
+ * @timestamp: the time that should be processed
+ * @interval: the time spacing between subsequent values
+ * @n_values: the number of values
+ * @values: (array length=n_values): array to put control-values in
+ *
+ * Gets a number of #GValues for the given controlled property starting at the
+ * requested time. The array @values need to hold enough space for @n_values of
+ * #GValue.
+ *
+ * This function is useful if one wants to e.g. draw a graph of the control
+ * curve or apply a control curve sample by sample.
+ *
+ * Returns: %TRUE if the given array could be filled, %FALSE otherwise
+ */
+gboolean
+gst_control_binding_get_g_value_array (GstControlBinding * binding,
+ GstClockTime timestamp, GstClockTime interval, guint n_values,
+ GValue * values)
+{
+ GstControlBindingClass *klass;
+ gboolean ret = FALSE;
+
+ g_return_val_if_fail (GST_IS_CONTROL_BINDING (binding), FALSE);
+ g_return_val_if_fail (GST_CLOCK_TIME_IS_VALID (timestamp), FALSE);
+ g_return_val_if_fail (GST_CLOCK_TIME_IS_VALID (interval), FALSE);
+ g_return_val_if_fail (values, FALSE);
+
+ klass = GST_CONTROL_BINDING_GET_CLASS (binding);
+
+ if (G_LIKELY (klass->get_g_value_array != NULL)) {
+ ret =
+ klass->get_g_value_array (binding, timestamp, interval, n_values,
+ values);
} else {
- GST_WARNING_OBJECT (self, "missing get_value_array implementation");
+ guint i;
+ GType type, base;
+
+ base = type = G_PARAM_SPEC_VALUE_TYPE (GST_CONTROL_BINDING_PSPEC (binding));
+ while ((type = g_type_parent (type)))
+ base = type;
+
+ GST_INFO_OBJECT (binding, "missing get_g_value_array implementation, we're "
+ "emulating it");
+ switch (base) {
+ case G_TYPE_INT:
+ CONVERT_ARRAY (int, INT);
+ break;
+ case G_TYPE_UINT:
+ CONVERT_ARRAY (uint, UINT);
+ break;
+ case G_TYPE_LONG:
+ CONVERT_ARRAY (long, LONG);
+ break;
+ case G_TYPE_ULONG:
+ CONVERT_ARRAY (ulong, ULONG);
+ break;
+ case G_TYPE_INT64:
+ CONVERT_ARRAY (int64, INT64);
+ break;
+ case G_TYPE_UINT64:
+ CONVERT_ARRAY (uint64, UINT64);
+ break;
+ case G_TYPE_FLOAT:
+ CONVERT_ARRAY (float, FLOAT);
+ break;
+ case G_TYPE_DOUBLE:
+ CONVERT_ARRAY (double, DOUBLE);
+ break;
+ case G_TYPE_BOOLEAN:
+ CONVERT_ARRAY (boolean, BOOLEAN);
+ break;
+ case G_TYPE_ENUM:
+ {
+ gint *v = g_new (gint, n_values);
+ ret = gst_control_binding_get_value_array (binding, timestamp, interval,
+ n_values, v);
+ if (ret) {
+ for (i = 0; i < n_values; i++) {
+ g_value_init (&values[i], type);
+ g_value_set_enum (&values[i], v[i]);
+ }
+ }
+ g_free (v);
+ }
+ break;
+ default:
+ GST_WARNING ("incomplete implementation for paramspec type '%s'",
+ G_PARAM_SPEC_TYPE_NAME (GST_CONTROL_BINDING_PSPEC (binding)));
+ GST_CONTROL_BINDING_PSPEC (binding) = NULL;
+ break;
+ }
}
return ret;
}
/**
* gst_control_binding_set_disabled:
- * @self: the control binding
+ * @binding: the control binding
* @disabled: boolean that specifies whether to disable the controller
* or not.
*
* gst_object_sync_values() will do nothing.
*/
void
-gst_control_binding_set_disabled (GstControlBinding * self, gboolean disabled)
+gst_control_binding_set_disabled (GstControlBinding * binding,
+ gboolean disabled)
{
- g_return_if_fail (GST_IS_CONTROL_BINDING (self));
- self->disabled = disabled;
+ g_return_if_fail (GST_IS_CONTROL_BINDING (binding));
+ binding->disabled = disabled;
}
/**
* gst_control_binding_is_disabled:
- * @self: the control binding
+ * @binding: the control binding
*
* Check if the control binding is disabled.
*
* Returns: %TRUE if the binding is inactive
*/
gboolean
-gst_control_binding_is_disabled (GstControlBinding * self)
+gst_control_binding_is_disabled (GstControlBinding * binding)
{
- g_return_val_if_fail (GST_IS_CONTROL_BINDING (self), TRUE);
- return (self->disabled == TRUE);
+ g_return_val_if_fail (GST_IS_CONTROL_BINDING (binding), TRUE);
+ return ! !binding->disabled;
}
projects / platform / upstream / gstreamer.git / blobdiff