gstreamer/gst/gstcontrolbinding.c

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/* GStreamer
*
* Copyright (C) 2011 Stefan Sauer <ensonic@users.sf.net>
*
* gstcontrolbinding.c: Attachment for control sources
*
* 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:gstcontrolbinding
* @short_description: attachment for control source sources
*
* A value mapping object that attaches control sources to gobject properties.
*/
#include "gst_private.h"
#include <glib-object.h>
#include <gst/gst.h>
#include "gstcontrolbinding.h"
#include <math.h>
#define GST_CAT_DEFAULT control_binding_debug
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
#define _do_init \
GST_DEBUG_CATEGORY_INIT (GST_CAT_DEFAULT, "gstcontrolbinding", 0, \
"dynamic parameter control source attachment");
static GObject *gst_control_binding_constructor (GType type,
guint n_construct_params, GObjectConstructParam * construct_params);
static void gst_control_binding_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_control_binding_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_control_binding_dispose (GObject * object);
static void gst_control_binding_finalize (GObject * object);
G_DEFINE_ABSTRACT_TYPE_WITH_CODE (GstControlBinding, gst_control_binding,
GST_TYPE_OBJECT, _do_init);
enum
{
PROP_0,
PROP_OBJECT,
PROP_NAME,
PROP_LAST
};
static GParamSpec *properties[PROP_LAST];
static void
gst_control_binding_class_init (GstControlBindingClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->constructor = gst_control_binding_constructor;
gobject_class->set_property = gst_control_binding_set_property;
gobject_class->get_property = gst_control_binding_get_property;
gobject_class->dispose = gst_control_binding_dispose;
gobject_class->finalize = gst_control_binding_finalize;
properties[PROP_OBJECT] =
g_param_spec_object ("object", "Object",
"The object of the property", GST_TYPE_OBJECT,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS);
properties[PROP_NAME] =
g_param_spec_string ("name", "Name", "The name of the property", NULL,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS);
g_object_class_install_properties (gobject_class, PROP_LAST, properties);
}
static void
gst_control_binding_init (GstControlBinding * self)
{
}
static GObject *
gst_control_binding_constructor (GType type, guint n_construct_params,
GObjectConstructParam * construct_params)
{
GstControlBinding *self;
GParamSpec *pspec;
self = 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);
/* 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);
/* 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;
}
} else {
GST_WARNING_OBJECT (self->object, "class '%s' has no property '%s'",
G_OBJECT_TYPE_NAME (self->object), self->name);
}
return (GObject *) self;
}
static void
gst_control_binding_dispose (GObject * object)
{
GstControlBinding *self = GST_CONTROL_BINDING (object);
if (self->object)
gst_object_replace (&self->object, NULL);
}
static void
gst_control_binding_finalize (GObject * object)
{
GstControlBinding *self = GST_CONTROL_BINDING (object);
g_free (self->name);
}
static void
gst_control_binding_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstControlBinding *self = GST_CONTROL_BINDING (object);
switch (prop_id) {
case PROP_OBJECT:
self->object = g_value_dup_object (value);
break;
case PROP_NAME:
self->name = g_value_dup_string (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_control_binding_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstControlBinding *self = GST_CONTROL_BINDING (object);
switch (prop_id) {
case PROP_OBJECT:
g_value_set_object (value, self->object);
break;
case PROP_NAME:
g_value_set_string (value, self->name);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/* functions */
/**
* gst_control_binding_sync_values:
* @self: 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
*
* Sets the property of the @object, according to the #GstControlSources that
* handle them and for the given timestamp.
*
* If this function fails, it is most likely the application developers fault.
* Most probably the control sources are not setup correctly.
*
* Returns: %TRUE if the controller value could be applied to the object
* property, %FALSE otherwise
*/
gboolean
gst_control_binding_sync_values (GstControlBinding * self, GstObject * object,
GstClockTime timestamp, GstClockTime last_sync)
{
GstControlBindingClass *klass;
gboolean ret = FALSE;
g_return_val_if_fail (GST_IS_CONTROL_BINDING (self), FALSE);
if (self->disabled)
return TRUE;
klass = GST_CONTROL_BINDING_GET_CLASS (self);
if (G_LIKELY (klass->sync_values != NULL)) {
ret = klass->sync_values (self, object, timestamp, last_sync);
} else {
GST_WARNING_OBJECT (self, "missing sync_values implementation");
}
return ret;
}
/**
* gst_control_binding_get_value:
* @self: 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.
*/
GValue *
gst_control_binding_get_value (GstControlBinding * self, GstClockTime timestamp)
{
GstControlBindingClass *klass;
GValue *ret = NULL;
g_return_val_if_fail (GST_IS_CONTROL_BINDING (self), NULL);
g_return_val_if_fail (GST_CLOCK_TIME_IS_VALID (timestamp), NULL);
klass = GST_CONTROL_BINDING_GET_CLASS (self);
if (G_LIKELY (klass->get_value != NULL)) {
ret = klass->get_value (self, timestamp);
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} else {
GST_WARNING_OBJECT (self, "missing get_value implementation");
}
return ret;
}
/**
* gst_control_binding_get_value_array:
* @self: 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
*
* Gets a number of values for the given controllered 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.
*
* Returns: %TRUE if the given array could be filled, %FALSE otherwise
*/
gboolean
gst_control_binding_get_value_array (GstControlBinding * self,
GstClockTime timestamp, GstClockTime interval, guint n_values,
GValue * values)
{
GstControlBindingClass *klass;
gboolean ret = FALSE;
g_return_val_if_fail (GST_IS_CONTROL_BINDING (self), 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);
if (G_LIKELY (klass->get_value_array != NULL)) {
ret = klass->get_value_array (self, timestamp, interval, n_values, values);
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} else {
GST_WARNING_OBJECT (self, "missing get_value_array implementation");
}
return ret;
}
/**
* gst_control_binding_set_disabled:
* @self: the control binding
* @disabled: boolean that specifies whether to disable the controller
* or not.
*
* This function is used to disable a control binding for some time, i.e.
* gst_object_sync_values() will do nothing.
*/
void
gst_control_binding_set_disabled (GstControlBinding * self, gboolean disabled)
{
g_return_if_fail (GST_IS_CONTROL_BINDING (self));
self->disabled = disabled;
}
/**
* gst_control_binding_is_disabled:
* @self: 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)
{
g_return_val_if_fail (GST_IS_CONTROL_BINDING (self), TRUE);
return (self->disabled == TRUE);
}