gst/gstcontrolbinding.h

   1 /* GStreamer
   2  *
   3  * Copyright (C) 2011 Stefan Sauer <ensonic@users.sf.net>
   4  *
   5  * gstcontrolbinding.h: Attachment for control sources
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Library General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Library General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Library General Public
  18  * License along with this library; if not, write to the
  19  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20  * Boston, MA 02111-1307, USA.
  21  */
  22
  23 #ifndef __GST_CONTROL_BINDING_H__
  24 #define __GST_CONTROL_BINDING_H__
  25
  26 #include <gst/gstconfig.h>
  27
  28 #include <glib-object.h>
  29
  30 #include <gst/gstcontrolsource.h>
  31
  32 G_BEGIN_DECLS
  33
  34 #define GST_TYPE_CONTROL_BINDING \
  35   (gst_control_binding_get_type())
  36 #define GST_CONTROL_BINDING(obj) \
  37   (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_CONTROL_BINDING,GstControlBinding))
  38 #define GST_CONTROL_BINDING_CLASS(klass) \
  39   (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_CONTROL_BINDING,GstControlBindingClass))
  40 #define GST_IS_CONTROL_BINDING(obj) \
  41   (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_CONTROL_BINDING))
  42 #define GST_IS_CONTROL_BINDING_CLASS(klass) \
  43   (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_CONTROL_BINDING))
  44 #define GST_CONTROL_BINDING_GET_CLASS(obj) \
  45   (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_CONTOL_SOURCE, GstControlBindingClass))
  46
  47 typedef struct _GstControlBinding GstControlBinding;
  48 typedef struct _GstControlBindingClass GstControlBindingClass;
  49
  50 /**
  51  * GstControlBindingConvert:
  52  * @self: the #GstControlBinding instance
  53  * @src_value: the value returned by the cotnrol source
  54  * @dest_value: the target GValue
  55  *
  56  * Function to map a control-value to the target GValue.
  57  */
  58 typedef void (* GstControlBindingConvert) (GstControlBinding *self, gdouble src_value, GValue *dest_value);
  59
  60 /**
  61  * GstControlBinding:
  62  * @name: name of the property of this binding
  63  *
  64  * The instance structure of #GstControlBinding.
  65  */
  66 struct _GstControlBinding {
  67   GstObject parent;
  68
  69   /*< public >*/
  70   const gchar *name;            /* name of the property */
  71
  72   /*< private >*/
  73   GParamSpec *pspec;            /* GParamSpec for this property */
  74   GstControlSource *csource;    /* GstControlSource for this property */
  75   gboolean disabled;
  76   GValue cur_value;
  77   gdouble last_value;
  78
  79   GstControlBindingConvert convert;
  80
  81   gpointer _gst_reserved[GST_PADDING];
  82 };
  83
  84 /**
  85  * GstControlBindingClass:
  86  * @parent_class: Parent class
  87  * @convert: Class method to convert control-values
  88  *
  89  * The class structure of #GstControlBinding.
  90  */
  91
  92 struct _GstControlBindingClass
  93 {
  94   GstObjectClass parent_class;
  95
  96   /* need vfuncs for:
  97   _sync_values
  98   _get_value
  99   _get_value_array
 100   */
 101
 102   /*< private >*/
 103   gpointer _gst_reserved[GST_PADDING];
 104 };
 105
 106 GType gst_control_binding_get_type (void);
 107
 108 /* Functions */
 109
 110 GstControlBinding * gst_control_binding_new                (GstObject * object, const gchar * property_name,
 111                                                             GstControlSource * csource);
 112
 113 gboolean            gst_control_binding_sync_values        (GstControlBinding * self, GstObject *object,
 114                                                             GstClockTime timestamp, GstClockTime last_sync);
 115 GValue *            gst_control_binding_get_value          (GstControlBinding *binding,
 116                                                             GstClockTime timestamp);
 117 gboolean            gst_control_binding_get_value_array    (GstControlBinding *binding, GstClockTime timestamp,
 118                                                             GstClockTime interval, guint n_values, GValue *values);
 119 GstControlSource *  gst_control_binding_get_control_source (GstControlBinding * self);
 120 void                gst_control_binding_set_disabled       (GstControlBinding * self, gboolean disabled);
 121 gboolean            gst_control_binding_is_disabled        (GstControlBinding * self);
 122 G_END_DECLS
 123
 124 #endif /* __GST_CONTROL_BINDING_H__ */