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8983cce9f6
We need different export decorators for the different libs. For now no actual change though, just rename before the release, and add prelude headers to define the new decorator to GST_EXPORT.
151 lines
4.7 KiB
C
151 lines
4.7 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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, 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 value which will be set to the result.
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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 values array 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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*
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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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GST_API
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GType gst_control_source_get_type (void);
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/* Functions */
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GST_API
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gboolean gst_control_source_get_value (GstControlSource *self, GstClockTime timestamp,
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gdouble *value);
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GST_API
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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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#ifdef G_DEFINE_AUTOPTR_CLEANUP_FUNC
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G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstControlSource, gst_object_unref)
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#endif
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#ifdef G_DEFINE_AUTOPTR_CLEANUP_FUNC
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G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstValueArray, gst_object_unref)
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#endif
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G_END_DECLS
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#endif /* __GST_CONTROL_SOURCE_H__ */
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