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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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09141c6e1f
Since we started depending on GLib 2.44, we can be sure this macro is defined (it will be a no-op on compilers that don't support it). For plugins we should just start using `G_DECLARE_FINAL_TYPE` which means we no longer need the macro there, but for most types in core we don't want to break ABI, which means it's better to just keep it like it is (and use the `#ifdef` instead).
147 lines
4.6 KiB
C
147 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., 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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G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstControlSource, gst_object_unref)
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G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstValueArray, gst_object_unref)
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G_END_DECLS
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#endif /* __GST_CONTROL_SOURCE_H__ */
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