1 files changed, 139 insertions, 0 deletions
diff --git a/gst/gstcontrolsource.h b/gst/gstcontrolsource.h
new file mode 100644
index 0000000..5debda4
--- /dev/null
+++ b/gst/gstcontrolsource.h
@@ -0,0 +1,139 @@
+/* GStreamer
+ *
+ * Copyright (C) 2007 Sebastian Dröge <slomo@circular-chaos.org>
+ *
+ * gstcontrolsource.h: Interface declaration 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.
+ */
+
+#ifndef __GST_CONTROL_SOURCE_H__
+#define __GST_CONTROL_SOURCE_H__
+
+#include <gst/gstconfig.h>
+
+#include <glib-object.h>
+
+#include <gst/gstclock.h>
+
+G_BEGIN_DECLS
+
+#define GST_TYPE_CONTROL_SOURCE \
+  (gst_control_source_get_type())
+#define GST_CONTROL_SOURCE(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_CONTROL_SOURCE,GstControlSource))
+#define GST_CONTROL_SOURCE_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_CONTROL_SOURCE,GstControlSourceClass))
+#define GST_IS_CONTROL_SOURCE(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_CONTROL_SOURCE))
+#define GST_IS_CONTROL_SOURCE_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_CONTROL_SOURCE))
+#define GST_CONTROL_SOURCE_GET_CLASS(obj) \
+  (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_CONTOL_SOURCE, GstControlSourceClass))
+
+typedef struct _GstControlSource GstControlSource;
+typedef struct _GstControlSourceClass GstControlSourceClass;
+typedef struct _GstTimedValue GstTimedValue;
+typedef struct _GstValueArray GstValueArray;
+
+/**
+ * GstTimedValue:
+ * @timestamp: timestamp of the value change
+ * @value: the corresponding value
+ *
+ * Structure for saving a timestamp and a value.
+ */
+struct _GstTimedValue
+{
+  GstClockTime timestamp;
+  gdouble      value;
+};
+
+/**
+ * GstControlSourceGetValue
+ * @self: the #GstControlSource instance
+ * @timestamp: timestamp for which a value should be calculated
+ * @value: a #GValue which will be set to the result. It must be initialized to the correct type.
+ *
+ * Function for returning a value for a given timestamp.
+ *
+ * Returns: %TRUE if the value was successfully calculated.
+ *
+ */
+typedef gboolean (* GstControlSourceGetValue) (GstControlSource *self, 
+    GstClockTime timestamp, gdouble *value);
+
+/**
+ * GstControlSourceGetValueArray
+ * @self: the #GstControlSource instance
+ * @timestamp: timestamp for which a value should be calculated
+ * @interval: the time spacing between subsequent values
+ * @n_values: the number of values
+ * @values: array to put control-values in
+ *
+ * Function for returning an array of values for starting at a given timestamp.
+ *
+ * Returns: %TRUE if the values were successfully calculated.
+ *
+ */
+typedef gboolean (* GstControlSourceGetValueArray) (GstControlSource *self, 
+    GstClockTime timestamp, GstClockTime interval, guint n_values, gdouble *values);
+
+/**
+ * GstControlSource:
+ * @get_value: Function for returning a value for a given timestamp
+ * @get_value_array: Function for returning a #GstValueArray for a given timestamp
+ *
+ * The instance structure of #GstControlSource.
+ */
+struct _GstControlSource {
+  GstObject parent;
+
+  /*< public >*/
+  GstControlSourceGetValue get_value;             /* Returns the value for a property at a given timestamp */
+  GstControlSourceGetValueArray get_value_array;  /* Returns values for a property in a given timespan */
+
+  /*< private >*/
+  gpointer _gst_reserved[GST_PADDING];
+};
+
+/**
+ * GstControlSourceClass:
+ * @parent_class: Parent class
+ * @bind: Class method for binding the #GstControlSource to a specific GParamSpec
+ *
+ * The class structure of #GstControlSource.
+ */
+
+struct _GstControlSourceClass
+{
+  GstObjectClass parent_class;
+
+  /*< private >*/
+  gpointer _gst_reserved[GST_PADDING];
+};
+
+GType gst_control_source_get_type (void);
+
+/* Functions */
+gboolean       gst_control_source_get_value             (GstControlSource *self, GstClockTime timestamp,
+                                                         gdouble *value);
+gboolean       gst_control_source_get_value_array       (GstControlSource *self, GstClockTime timestamp,
+                                                         GstClockTime interval, guint n_values,
+                                                         gdouble *values);
+G_END_DECLS
+
+#endif /* __GST_CONTROL_SOURCE_H__ */