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e0c9d4f879
Otherwise we'll get an assertion if the object behind the weak pointer was already destroyed in the meantime as we would pass NULL as first argument to g_object_remove_weak_pointer().
494 lines
15 KiB
C
494 lines
15 KiB
C
/* GStreamer
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*
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* Copyright (C) 2011 Stefan Sauer <ensonic@users.sf.net>
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*
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* gstcontrolbinding.c: Attachment for control sources
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:gstcontrolbinding
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* @title: GstControlBinding
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* @short_description: attachment for control source sources
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*
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* A base class for value mapping objects that attaches control sources to gobject
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* properties. Such an object is taking one or more #GstControlSource instances,
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* combines them and maps the resulting value to the type and value range of the
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* bound property.
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*/
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/* FIXME(ensonic): should we make gst_object_add_control_binding() internal
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* - we create the control_binding for a certain object anyway
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* - we could call gst_object_add_control_binding() at the end of
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* gst_control_binding_constructor()
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* - the weak-ref on object is not nice, as is the same as gst_object_parent()
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* once the object is added to the parent
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*
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* - another option would be to defer what is done in _constructor to when
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* the parent is set (need to listen to the signal then)
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* then basically I could
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* a) remove the obj arg and wait the binding to be added or
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* b) add the binding from constructor, unref object there and make obj
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* writeonly
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*/
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#include "gst_private.h"
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#include <glib-object.h>
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#include <gst/gst.h>
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#include "gstcontrolbinding.h"
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#include <math.h>
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struct _GstControlBindingPrivate
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{
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GWeakRef object;
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};
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#define GST_CAT_DEFAULT control_binding_debug
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GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
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#define _do_init \
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GST_DEBUG_CATEGORY_INIT (GST_CAT_DEFAULT, "gstcontrolbinding", 0, \
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"dynamic parameter control source attachment");
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static GObject *gst_control_binding_constructor (GType type,
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guint n_construct_params, GObjectConstructParam * construct_params);
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static void gst_control_binding_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_control_binding_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static void gst_control_binding_dispose (GObject * object);
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static void gst_control_binding_finalize (GObject * object);
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G_DEFINE_ABSTRACT_TYPE_WITH_CODE (GstControlBinding, gst_control_binding,
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GST_TYPE_OBJECT, G_ADD_PRIVATE (GstControlBinding) _do_init);
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enum
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{
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PROP_0,
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PROP_OBJECT,
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PROP_NAME,
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PROP_LAST
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};
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static GParamSpec *properties[PROP_LAST];
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static void
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gst_control_binding_class_init (GstControlBindingClass * klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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gobject_class->constructor = gst_control_binding_constructor;
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gobject_class->set_property = gst_control_binding_set_property;
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gobject_class->get_property = gst_control_binding_get_property;
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gobject_class->dispose = gst_control_binding_dispose;
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gobject_class->finalize = gst_control_binding_finalize;
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properties[PROP_OBJECT] =
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g_param_spec_object ("object", "Object",
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"The object of the property", GST_TYPE_OBJECT,
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G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS);
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properties[PROP_NAME] =
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g_param_spec_string ("name", "Name", "The name of the property", NULL,
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G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS);
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g_object_class_install_properties (gobject_class, PROP_LAST, properties);
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}
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static void
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gst_control_binding_init (GstControlBinding * binding)
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{
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binding->ABI.abi.priv = gst_control_binding_get_instance_private (binding);
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g_weak_ref_init (&binding->ABI.abi.priv->object, NULL);
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}
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static GObject *
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gst_control_binding_constructor (GType type, guint n_construct_params,
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GObjectConstructParam * construct_params)
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{
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GstControlBinding *binding;
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GParamSpec *pspec;
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GstObject *object;
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binding =
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GST_CONTROL_BINDING (G_OBJECT_CLASS (gst_control_binding_parent_class)
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->constructor (type, n_construct_params, construct_params));
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object = g_weak_ref_get (&binding->ABI.abi.priv->object);
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if (!object) {
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GST_WARNING_OBJECT (object, "no object set");
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return (GObject *) binding;
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}
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GST_INFO_OBJECT (object, "trying to put property '%s' under control",
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binding->name);
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/* check if the object has a property of that name */
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if ((pspec =
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g_object_class_find_property (G_OBJECT_GET_CLASS (object),
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binding->name))) {
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GST_DEBUG_OBJECT (object, " psec->flags : 0x%08x", pspec->flags);
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/* check if this param is witable && controlable && !construct-only */
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if ((pspec->flags & (G_PARAM_WRITABLE | GST_PARAM_CONTROLLABLE |
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G_PARAM_CONSTRUCT_ONLY)) ==
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(G_PARAM_WRITABLE | GST_PARAM_CONTROLLABLE)) {
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binding->pspec = pspec;
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} else {
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GST_WARNING_OBJECT (object,
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"property '%s' on class '%s' needs to "
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"be writeable, controlable and not construct_only", binding->name,
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G_OBJECT_TYPE_NAME (object));
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}
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} else {
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GST_WARNING_OBJECT (object, "class '%s' has no property '%s'",
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G_OBJECT_TYPE_NAME (object), binding->name);
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}
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gst_object_unref (object);
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return (GObject *) binding;
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}
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static void
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gst_control_binding_dispose (GObject * object)
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{
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GstControlBinding *self = GST_CONTROL_BINDING (object);
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/* we did not took a reference */
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if (self->__object)
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g_object_remove_weak_pointer ((GObject *) self->__object,
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(gpointer *) & self->__object);
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self->__object = NULL;
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g_weak_ref_clear (&self->ABI.abi.priv->object);
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((GObjectClass *) gst_control_binding_parent_class)->dispose (object);
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}
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static void
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gst_control_binding_finalize (GObject * object)
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{
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GstControlBinding *self = GST_CONTROL_BINDING (object);
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g_free (self->name);
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((GObjectClass *) gst_control_binding_parent_class)->finalize (object);
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}
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static void
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gst_control_binding_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstControlBinding *self = GST_CONTROL_BINDING (object);
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switch (prop_id) {
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case PROP_OBJECT:
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/* do not ref to avoid a ref cycle */
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self->__object = g_value_get_object (value);
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g_object_add_weak_pointer ((GObject *) self->__object,
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(gpointer *) & self->__object);
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g_weak_ref_set (&self->ABI.abi.priv->object, self->__object);
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break;
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case PROP_NAME:
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self->name = g_value_dup_string (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_control_binding_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstControlBinding *self = GST_CONTROL_BINDING (object);
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switch (prop_id) {
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case PROP_OBJECT:
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g_value_take_object (value, g_weak_ref_get (&self->ABI.abi.priv->object));
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break;
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case PROP_NAME:
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g_value_set_string (value, self->name);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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/* functions */
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/**
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* gst_control_binding_sync_values:
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* @binding: the control binding
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* @object: the object that has controlled properties
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* @timestamp: the time that should be processed
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* @last_sync: the last time this was called
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*
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* Sets the property of the @object, according to the #GstControlSources that
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* handle them and for the given timestamp.
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*
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* If this function fails, it is most likely the application developers fault.
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* Most probably the control sources are not setup correctly.
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*
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* Returns: %TRUE if the controller value could be applied to the object
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* property, %FALSE otherwise
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*/
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gboolean
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gst_control_binding_sync_values (GstControlBinding * binding,
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GstObject * object, GstClockTime timestamp, GstClockTime last_sync)
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{
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GstControlBindingClass *klass;
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gboolean ret = FALSE;
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g_return_val_if_fail (GST_IS_CONTROL_BINDING (binding), FALSE);
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if (binding->disabled)
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return TRUE;
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klass = GST_CONTROL_BINDING_GET_CLASS (binding);
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if (G_LIKELY (klass->sync_values != NULL)) {
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ret = klass->sync_values (binding, object, timestamp, last_sync);
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} else {
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GST_WARNING_OBJECT (binding, "missing sync_values implementation");
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}
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return ret;
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}
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/**
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* gst_control_binding_get_value:
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* @binding: the control binding
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* @timestamp: the time the control-change should be read from
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*
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* Gets the value for the given controlled property at the requested time.
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*
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* Returns: (nullable): the GValue of the property at the given time,
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* or %NULL if the property isn't controlled.
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*/
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GValue *
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gst_control_binding_get_value (GstControlBinding * binding,
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GstClockTime timestamp)
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{
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GstControlBindingClass *klass;
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GValue *ret = NULL;
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g_return_val_if_fail (GST_IS_CONTROL_BINDING (binding), NULL);
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g_return_val_if_fail (GST_CLOCK_TIME_IS_VALID (timestamp), NULL);
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klass = GST_CONTROL_BINDING_GET_CLASS (binding);
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if (G_LIKELY (klass->get_value != NULL)) {
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ret = klass->get_value (binding, timestamp);
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} else {
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GST_WARNING_OBJECT (binding, "missing get_value implementation");
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}
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return ret;
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}
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/**
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* gst_control_binding_get_value_array: (skip)
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* @binding: the control binding
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* @timestamp: the time that should be processed
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* @interval: the time spacing between subsequent values
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* @n_values: the number of values
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* @values: (array length=n_values): array to put control-values in
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*
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* Gets a number of values for the given controlled property starting at the
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* requested time. The array @values need to hold enough space for @n_values of
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* the same type as the objects property's type.
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*
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* This function is useful if one wants to e.g. draw a graph of the control
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* curve or apply a control curve sample by sample.
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*
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* The values are unboxed and ready to be used. The similar function
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* gst_control_binding_get_g_value_array() returns the array as #GValues and is
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* more suitable for bindings.
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*
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* Returns: %TRUE if the given array could be filled, %FALSE otherwise
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*/
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gboolean
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gst_control_binding_get_value_array (GstControlBinding * binding,
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GstClockTime timestamp, GstClockTime interval, guint n_values,
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gpointer values)
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{
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GstControlBindingClass *klass;
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gboolean ret = FALSE;
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g_return_val_if_fail (GST_IS_CONTROL_BINDING (binding), FALSE);
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g_return_val_if_fail (GST_CLOCK_TIME_IS_VALID (timestamp), FALSE);
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g_return_val_if_fail (GST_CLOCK_TIME_IS_VALID (interval), FALSE);
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g_return_val_if_fail (values, FALSE);
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klass = GST_CONTROL_BINDING_GET_CLASS (binding);
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if (G_LIKELY (klass->get_value_array != NULL)) {
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ret =
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klass->get_value_array (binding, timestamp, interval, n_values, values);
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} else {
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GST_WARNING_OBJECT (binding, "missing get_value_array implementation");
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}
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return ret;
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}
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#define CONVERT_ARRAY(type,TYPE) \
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{ \
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g##type *v = g_new (g##type,n_values); \
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ret = gst_control_binding_get_value_array (binding, timestamp, interval, \
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n_values, v); \
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if (ret) { \
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for (i = 0; i < n_values; i++) { \
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g_value_init (&values[i], G_TYPE_##TYPE); \
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g_value_set_##type (&values[i], v[i]); \
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} \
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} \
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g_free (v); \
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}
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/**
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* gst_control_binding_get_g_value_array:
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* @binding: the control binding
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* @timestamp: the time that should be processed
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* @interval: the time spacing between subsequent values
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* @n_values: the number of values
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* @values: (array length=n_values): array to put control-values in
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*
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* Gets a number of #GValues for the given controlled property starting at the
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* requested time. The array @values need to hold enough space for @n_values of
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* #GValue.
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*
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* This function is useful if one wants to e.g. draw a graph of the control
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* curve or apply a control curve sample by sample.
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*
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* Returns: %TRUE if the given array could be filled, %FALSE otherwise
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*/
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gboolean
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gst_control_binding_get_g_value_array (GstControlBinding * binding,
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GstClockTime timestamp, GstClockTime interval, guint n_values,
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GValue * values)
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{
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GstControlBindingClass *klass;
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gboolean ret = FALSE;
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g_return_val_if_fail (GST_IS_CONTROL_BINDING (binding), FALSE);
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g_return_val_if_fail (GST_CLOCK_TIME_IS_VALID (timestamp), FALSE);
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g_return_val_if_fail (GST_CLOCK_TIME_IS_VALID (interval), FALSE);
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g_return_val_if_fail (values, FALSE);
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klass = GST_CONTROL_BINDING_GET_CLASS (binding);
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if (G_LIKELY (klass->get_g_value_array != NULL)) {
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ret =
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klass->get_g_value_array (binding, timestamp, interval, n_values,
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values);
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} else {
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guint i;
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GType type, base;
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base = type = G_PARAM_SPEC_VALUE_TYPE (GST_CONTROL_BINDING_PSPEC (binding));
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while ((type = g_type_parent (type)))
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base = type;
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GST_INFO_OBJECT (binding, "missing get_g_value_array implementation, we're "
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"emulating it");
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switch (base) {
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case G_TYPE_INT:
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CONVERT_ARRAY (int, INT);
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break;
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case G_TYPE_UINT:
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CONVERT_ARRAY (uint, UINT);
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break;
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case G_TYPE_LONG:
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CONVERT_ARRAY (long, LONG);
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break;
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case G_TYPE_ULONG:
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CONVERT_ARRAY (ulong, ULONG);
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break;
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case G_TYPE_INT64:
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CONVERT_ARRAY (int64, INT64);
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break;
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case G_TYPE_UINT64:
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CONVERT_ARRAY (uint64, UINT64);
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break;
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case G_TYPE_FLOAT:
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CONVERT_ARRAY (float, FLOAT);
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break;
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case G_TYPE_DOUBLE:
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CONVERT_ARRAY (double, DOUBLE);
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break;
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case G_TYPE_BOOLEAN:
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CONVERT_ARRAY (boolean, BOOLEAN);
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break;
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case G_TYPE_ENUM:
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{
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gint *v = g_new (gint, n_values);
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ret = gst_control_binding_get_value_array (binding, timestamp, interval,
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n_values, v);
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if (ret) {
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for (i = 0; i < n_values; i++) {
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g_value_init (&values[i], type);
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g_value_set_enum (&values[i], v[i]);
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}
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}
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g_free (v);
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}
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break;
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default:
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GST_WARNING ("incomplete implementation for paramspec type '%s'",
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G_PARAM_SPEC_TYPE_NAME (GST_CONTROL_BINDING_PSPEC (binding)));
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GST_CONTROL_BINDING_PSPEC (binding) = NULL;
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break;
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}
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}
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return ret;
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}
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/**
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* gst_control_binding_set_disabled:
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* @binding: the control binding
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* @disabled: boolean that specifies whether to disable the controller
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* or not.
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*
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* This function is used to disable a control binding for some time, i.e.
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* gst_object_sync_values() will do nothing.
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*/
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void
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gst_control_binding_set_disabled (GstControlBinding * binding,
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gboolean disabled)
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{
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g_return_if_fail (GST_IS_CONTROL_BINDING (binding));
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binding->disabled = disabled;
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}
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/**
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* gst_control_binding_is_disabled:
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* @binding: the control binding
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*
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* Check if the control binding is disabled.
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*
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* Returns: %TRUE if the binding is inactive
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*/
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gboolean
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gst_control_binding_is_disabled (GstControlBinding * binding)
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{
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g_return_val_if_fail (GST_IS_CONTROL_BINDING (binding), TRUE);
|
|
return ! !binding->disabled;
|
|
}
|