3 * Copyright (C) <2005> Stefan Kost <ensonic at users dot sf dot net>
5 * gst-controller.h: dynamic parameter control subsystem
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.
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.
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.
23 #ifndef __GST_CONTROLLER_H__
24 #define __GST_CONTROLLER_H__
29 #include <glib-object.h>
30 #include <glib/gprintf.h>
36 * GST_PARAM_CONTROLLABLE:
38 * Use this flag on GstElement properties you wish to be (eventually) handled
40 * TODO: needs to go to gstelemnt.h (to avoid clashes on G_PARAM_USER_SHIFT)
42 #define GST_PARAM_CONTROLLABLE (1 << (G_PARAM_USER_SHIFT + 1))
48 * a structure for value+time
50 typedef struct _GstTimedValue
52 GstClockTime timestamp; // timestamp of the value change
53 GValue value; // the new value
54 /* TODO what about storing the difference to next timestamp and value here
55 + make calculations slightly easier and faster
56 - determining the GType for the value_dif is not simple
57 e.g. if value is G_TYPE_UCHAR value_diff needs to be G_TYPE_INT
65 * Structure to receive multiple values at once
67 typedef struct _GstValueArray
70 gint nbsamples; // Number of samples requested
71 GstClockTime sample_interval; // Interval between each sample
72 gpointer *values; // pointer to the array (so it can be filled if NULL)
78 * @GST_INTERPOLATE_NONE: steps-like interpolation, default
79 * @GST_INTERPOLATE_TRIGGER: returns the default value of the property,
80 * except for times with specific values
81 * @GST_INTERPOLATE_LINEAR: linear interpolation
82 * @GST_INTERPOLATE_QUADRATIC: square interpolation
83 * @GST_INTERPOLATE_CUBIC: cubic interpolation
84 * @GST_INTERPOLATE_USER: user-provided interpolation
86 * The various interpolation modes available.
91 GST_INTERPOLATE_TRIGGER,
92 GST_INTERPOLATE_LINEAR,
93 GST_INTERPOLATE_QUADRATIC,
94 GST_INTERPOLATE_CUBIC,
99 struct _GstControlledProperty;
101 typedef GValue *(*InterpolateGet) (struct _GstControlledProperty * prop,
102 GstClockTime timestamp);
103 typedef gboolean (*InterpolateGetValueArray) (struct _GstControlledProperty * prop,
104 GstClockTime timestamp, GstValueArray * value_array);
107 * GstInterpolateMethod:
109 * Function pointer structure to do user-defined interpolation methods
111 typedef struct _GstInterpolateMethod
113 InterpolateGet get_int;
114 InterpolateGetValueArray get_int_value_array;
115 InterpolateGet get_long;
116 InterpolateGetValueArray get_long_value_array;
117 InterpolateGet get_float;
118 InterpolateGetValueArray get_float_value_array;
119 InterpolateGet get_double;
120 InterpolateGetValueArray get_double_value_array;
121 } GstInterpolateMethod;
124 * GstControlledProperty:
126 typedef struct _GstControlledProperty
128 gchar *name; // name of the property
129 GType type; // type of the handled property
130 GValue default_value; // default value for the handled property
131 GValue result_value; // result value location for the interpolation method
132 GstTimedValue last_value; // the last value a _sink call wrote
133 GstTimedValue live_value; // temporary value override for live input
134 gulong notify_handler_id; // id of the notify::<name> signal handler
135 GstInterpolateMode interpolation; // Interpolation mode
136 /* TODO instead of *method, have pointers to get() and get_value_array() here
137 gst_controller_set_interpolation_mode() will pick the right ones for the
138 properties value type
139 GstInterpolateMethod *method; // User-implemented handler (if interpolation == GST_INTERPOLATE_USER)
142 InterpolateGetValueArray get_value_array;
144 GList *values; // List of GstTimedValue
145 /* TODO keep the last search result to be able to continue
146 GList *last_value; // last search result, can be used for incremental searches
148 } GstControlledProperty;
150 #define GST_CONTROLLED_PROPERTY(obj) ((GstControlledProperty *)(obj))
154 #define GST_TYPE_CONTROLLER (gst_controller_get_type ())
155 #define GST_CONTROLLER(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_CONTROLLER, GstController))
156 #define GST_CONTROLLER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_CONTROLLER, GstControllerClass))
157 #define GST_IS_CONTROLLER(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_CONTROLLER))
158 #define GST_IS_CONTROLLER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_CONTROLLERE))
159 #define GST_CONTROLLER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_CONTROLLER, GstControllerClass))
161 typedef struct _GstController GstController;
162 typedef struct _GstControllerClass GstControllerClass;
164 //typedef struct _GstControllerPrivate GstControllerPrivate;
169 * The instance structure of GstController
172 struct _GstController
176 GList *properties; // List of GstControlledProperty
177 GMutex *lock; // Secure property access, elements will access from threads
178 GObject *object; // the object we control
181 struct _GstControllerClass
183 GObjectClass parent_class;
186 GType gst_controller_get_type (void);
188 /* GstController functions */
190 GstController *gst_controller_new_valist (GObject * object, va_list var_args);
191 GstController *gst_controller_new (GObject * object, ...);
193 gboolean gst_controller_remove_properties_valist (GstController * self,
195 gboolean gst_controller_remove_properties (GstController * self, ...);
197 gboolean gst_controller_set (GstController * self, gchar * property_name,
198 GstClockTime timestamp, GValue * value);
199 gboolean gst_controller_set_from_list (GstController * self,
200 gchar * property_name, GSList * timedvalues);
202 gboolean gst_controller_unset (GstController * self, gchar * property_name,
203 GstClockTime timestamp);
206 GValue *gst_controller_get (GstController * self, gchar * property_name,
207 GstClockTime timestamp);
208 const GList *gst_controller_get_all (GstController * self,
209 gchar * property_name);
212 gboolean gst_controller_sink_values (GstController * self,
213 GstClockTime timestamp);
215 gboolean gst_controller_get_value_arrays (GstController * self,
216 GstClockTime timestamp, GSList * value_arrays);
217 gboolean gst_controller_get_value_array (GstController * self,
218 GstClockTime timestamp, GstValueArray * value_array);
220 gboolean gst_controller_set_interpolation_mode (GstController * self,
221 gchar * property_name, GstInterpolateMode mode);
224 /* GObject convenience functions */
226 GstController *gst_object_control_properties (GObject * object, ...);
227 gboolean gst_object_uncontrol_properties (GObject * object, ...);
229 GstController *gst_object_get_controller (GObject * object);
230 gboolean gst_object_set_controller (GObject * object, GstController * controller);
232 gboolean gst_object_sink_values (GObject * object, GstClockTime timestamp);
234 gboolean gst_object_get_value_arrays (GObject * object,
235 GstClockTime timestamp, GSList * value_arrays);
236 gboolean gst_object_get_value_array (GObject * object,
237 GstClockTime timestamp, GstValueArray * value_array);
241 gboolean gst_controller_init (int * argc, char ***argv);
244 #endif /* __GST_CONTROLLER_H__ */