gstreamer/libs/gst/controller/gstproxycontrolbinding.c

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/*
* GStreamer
* Copyright (C) 2016 Matthew Waters <matthew@centricular.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:gstproxycontrolbinding
* @title: GstProxyControlBinding
* @short_description: attachment for forwarding control sources
* @see_also: #GstControlBinding
*
* A #GstControlBinding that forwards requests to another #GstControlBinding
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstproxycontrolbinding.h"
G_DEFINE_TYPE (GstProxyControlBinding,
gst_proxy_control_binding, GST_TYPE_CONTROL_BINDING);
static void
gst_proxy_control_binding_init (GstProxyControlBinding * self)
{
g_weak_ref_init (&self->ref_object, NULL);
}
static void
gst_proxy_control_binding_finalize (GObject * object)
{
GstProxyControlBinding *self = (GstProxyControlBinding *) object;
g_weak_ref_clear (&self->ref_object);
g_free (self->property_name);
G_OBJECT_CLASS (gst_proxy_control_binding_parent_class)->finalize (object);
}
static gboolean
gst_proxy_control_binding_sync_values (GstControlBinding * binding,
GstObject * object, GstClockTime timestamp, GstClockTime last_sync)
{
GstProxyControlBinding *self = (GstProxyControlBinding *)
binding;
gboolean ret = TRUE;
GstObject *ref_object;
ref_object = g_weak_ref_get (&self->ref_object);
if (ref_object) {
GstControlBinding *ref_binding =
gst_object_get_control_binding (ref_object, self->property_name);
if (ref_binding) {
ret = gst_control_binding_sync_values (ref_binding, ref_object,
timestamp, last_sync);
gst_object_unref (ref_binding);
}
gst_object_unref (ref_object);
}
return ret;
}
static GValue *
gst_proxy_control_binding_get_value (GstControlBinding * binding,
GstClockTime timestamp)
{
GstProxyControlBinding *self = (GstProxyControlBinding *)
binding;
GValue *ret = NULL;
GstObject *ref_object;
ref_object = g_weak_ref_get (&self->ref_object);
if (ref_object) {
GstControlBinding *ref_binding =
gst_object_get_control_binding (ref_object, self->property_name);
if (ref_binding) {
ret = gst_control_binding_get_value (ref_binding, timestamp);
gst_object_unref (ref_binding);
}
gst_object_unref (ref_object);
}
return ret;
}
static gboolean
gst_proxy_control_binding_get_value_array (GstControlBinding * binding,
GstClockTime timestamp, GstClockTime interval, guint n_values,
gpointer values)
{
GstProxyControlBinding *self = (GstProxyControlBinding *)
binding;
gboolean ret = FALSE;
GstObject *ref_object;
ref_object = g_weak_ref_get (&self->ref_object);
if (ref_object) {
GstControlBinding *ref_binding =
gst_object_get_control_binding (ref_object, self->property_name);
if (ref_binding) {
ret = gst_control_binding_get_value_array (ref_binding, timestamp,
interval, n_values, values);
gst_object_unref (ref_binding);
}
gst_object_unref (ref_object);
}
return ret;
}
static gboolean
gst_proxy_control_binding_get_g_value_array (GstControlBinding *
binding, GstClockTime timestamp, GstClockTime interval, guint n_values,
GValue * values)
{
GstProxyControlBinding *self = (GstProxyControlBinding *) binding;
gboolean ret = FALSE;
GstObject *ref_object;
ref_object = g_weak_ref_get (&self->ref_object);
if (ref_object) {
GstControlBinding *ref_binding =
gst_object_get_control_binding (ref_object, self->property_name);
if (ref_binding) {
ret = gst_control_binding_get_g_value_array (ref_binding, timestamp,
interval, n_values, values);
gst_object_unref (ref_binding);
}
gst_object_unref (ref_object);
}
return ret;
}
static void
gst_proxy_control_binding_class_init (GstProxyControlBindingClass * klass)
{
GstControlBindingClass *cb_class = GST_CONTROL_BINDING_CLASS (klass);
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
cb_class->sync_values = gst_proxy_control_binding_sync_values;
cb_class->get_value = gst_proxy_control_binding_get_value;
cb_class->get_value_array = gst_proxy_control_binding_get_value_array;
cb_class->get_g_value_array = gst_proxy_control_binding_get_g_value_array;
gobject_class->finalize = gst_proxy_control_binding_finalize;
}
/**
* gst_proxy_control_binding_new:
* @object: (transfer none): a #GstObject
* @property_name: the property name in @object to control
* @ref_object: (transfer none): a #GstObject to forward all
* #GstControlBinding requests to
* @ref_property_name: the property_name in @ref_object to control
*
* #GstProxyControlBinding forwards all access to data or sync_values()
* requests from @property_name on @object to the control binding at
* @ref_property_name on @ref_object.
*
* Returns: a new #GstControlBinding that proxies the control interface between
* properties on different #GstObject's
*
* Since: 1.12
*/
GstControlBinding *
gst_proxy_control_binding_new (GstObject * object, const gchar * property_name,
GstObject * ref_object, const gchar * ref_property_name)
{
GstProxyControlBinding *cb;
g_return_val_if_fail (GST_IS_OBJECT (object), NULL);
g_return_val_if_fail (property_name != NULL, NULL);
g_return_val_if_fail (GST_IS_OBJECT (ref_object), NULL);
g_return_val_if_fail (ref_property_name != NULL, NULL);
cb = g_object_new (GST_TYPE_PROXY_CONTROL_BINDING, "object", object,
"name", property_name, NULL);
g_weak_ref_set (&cb->ref_object, ref_object);
cb->property_name = g_strdup (ref_property_name);
return (GstControlBinding *) cb;
}