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139 lines
4.6 KiB
C
139 lines
4.6 KiB
C
/* GStreamer
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*
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* Copyright (C) 2007 Sebastian Dröge <slomo@circular-chaos.org>
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*
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* gstcontrolsource.h: Interface declaration 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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __GST_CONTROL_SOURCE_H__
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#define __GST_CONTROL_SOURCE_H__
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#include <gst/gstconfig.h>
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#include <glib-object.h>
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#include <gst/gstclock.h>
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G_BEGIN_DECLS
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#define GST_TYPE_CONTROL_SOURCE \
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(gst_control_source_get_type())
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#define GST_CONTROL_SOURCE(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_CONTROL_SOURCE,GstControlSource))
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#define GST_CONTROL_SOURCE_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_CONTROL_SOURCE,GstControlSourceClass))
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#define GST_IS_CONTROL_SOURCE(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_CONTROL_SOURCE))
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#define GST_IS_CONTROL_SOURCE_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_CONTROL_SOURCE))
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#define GST_CONTROL_SOURCE_GET_CLASS(obj) \
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(G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_CONTOL_SOURCE, GstControlSourceClass))
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typedef struct _GstControlSource GstControlSource;
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typedef struct _GstControlSourceClass GstControlSourceClass;
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typedef struct _GstTimedValue GstTimedValue;
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typedef struct _GstValueArray GstValueArray;
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/**
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* GstTimedValue:
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* @timestamp: timestamp of the value change
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* @value: the corresponding value
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*
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* Structure for saving a timestamp and a value.
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*/
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struct _GstTimedValue
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{
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GstClockTime timestamp;
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gdouble value;
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};
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/**
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* GstControlSourceGetValue
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* @self: the #GstControlSource instance
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* @timestamp: timestamp for which a value should be calculated
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* @value: a #GValue which will be set to the result. It must be initialized to the correct type.
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*
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* Function for returning a value for a given timestamp.
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*
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* Returns: %TRUE if the value was successfully calculated.
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*
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*/
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typedef gboolean (* GstControlSourceGetValue) (GstControlSource *self,
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GstClockTime timestamp, gdouble *value);
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/**
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* GstControlSourceGetValueArray
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* @self: the #GstControlSource instance
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* @timestamp: timestamp for which a value should be calculated
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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 to put control-values in
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*
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* Function for returning an array of values for starting at a given timestamp.
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*
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* Returns: %TRUE if the values were successfully calculated.
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*
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*/
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typedef gboolean (* GstControlSourceGetValueArray) (GstControlSource *self,
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GstClockTime timestamp, GstClockTime interval, guint n_values, gdouble *values);
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/**
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* GstControlSource:
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* @get_value: Function for returning a value for a given timestamp
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* @get_value_array: Function for returning a #GstValueArray for a given timestamp
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*
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* The instance structure of #GstControlSource.
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*/
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struct _GstControlSource {
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GstObject parent;
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/*< public >*/
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GstControlSourceGetValue get_value; /* Returns the value for a property at a given timestamp */
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GstControlSourceGetValueArray get_value_array; /* Returns values for a property in a given timespan */
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/*< private >*/
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gpointer _gst_reserved[GST_PADDING];
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};
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/**
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* GstControlSourceClass:
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* @parent_class: Parent class
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* @bind: Class method for binding the #GstControlSource to a specific GParamSpec
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*
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* The class structure of #GstControlSource.
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*/
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struct _GstControlSourceClass
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{
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GstObjectClass parent_class;
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/*< private >*/
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gpointer _gst_reserved[GST_PADDING];
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};
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GType gst_control_source_get_type (void);
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/* Functions */
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gboolean gst_control_source_get_value (GstControlSource *self, GstClockTime timestamp,
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gdouble *value);
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gboolean gst_control_source_get_value_array (GstControlSource *self, GstClockTime timestamp,
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GstClockTime interval, guint n_values,
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gdouble *values);
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G_END_DECLS
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#endif /* __GST_CONTROL_SOURCE_H__ */
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