gstreamer/libs/gst/control/dparam.h

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/* GStreamer
* Copyright (C) 2001 Steve Baker <stevebaker_org@yahoo.co.uk>
*
* gstdparam.h: Dynamic Parameter functionality
*
* 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_DPARAM_H__
#define __GST_DPARAM_H__
#include <gst/gstobject.h>
#include "dparamcommon.h"
G_BEGIN_DECLS
#define GST_TYPE_DPARAM (gst_dparam_get_type ())
#define GST_DPARAM(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_DPARAM,GstDParam))
#define GST_DPARAM_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_DPARAM,GstDParam))
#define GST_IS_DPARAM(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_DPARAM))
#define GST_IS_DPARAM_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_DPARAM))
#define GST_DPARAM_NAME(dparam) (GST_OBJECT_NAME(dparam))
#define GST_DPARAM_PARENT(dparam) (GST_OBJECT_PARENT(dparam))
#define GST_DPARAM_CHANGE_VALUE(dparam) ((dparam)->change_value)
#define GST_DPARAM_PARAM_SPEC(dparam) ((dparam)->param_spec)
#define GST_DPARAM_MANAGER(dparam) ((dparam)->manager)
#define GST_DPARAM_TYPE(dparam) ((dparam)->type)
#define GST_DPARAM_UNIT_NAME(dparam) ((dparam)->unit_name)
#define GST_DPARAM_IS_LOG(dparam) ((dparam)->is_log)
#define GST_DPARAM_META_VALUES(dparam) ((dparam)->meta_values)
#define GST_DPARAM_META_PARAM_SPECS(dparam) ((dparam)->meta_param_specs)
#define GST_DPARAM_LOCK(dparam) (g_mutex_lock((dparam)->lock))
#define GST_DPARAM_UNLOCK(dparam) (g_mutex_unlock((dparam)->lock))
#define GST_DPARAM_READY_FOR_UPDATE(dparam) ((dparam)->ready_for_update)
#define GST_DPARAM_NEXT_UPDATE_TIMESTAMP(dparam) ((dparam)->next_update_timestamp)
#define GST_DPARAM_LAST_UPDATE_TIMESTAMP(dparam) ((dparam)->last_update_timestamp)
#define GST_DPARAM_DO_UPDATE(dparam, timestamp, value, update_info) \
((dparam->do_update_func)(dparam, timestamp, value, update_info))
typedef struct _GstDParamClass GstDParamClass;
typedef enum {
GST_DPARAM_UPDATE_FIRST,
GST_DPARAM_UPDATE_NORMAL,
} GstDParamUpdateInfo;
typedef void (*GstDParamDoUpdateFunction) (GstDParam *dparam, gint64 timestamp, GValue *value, GstDParamUpdateInfo update_info);
struct _GstDParam {
GstObject object;
GstDParamDoUpdateFunction do_update_func;
GMutex *lock;
gfloat value_float;
gint value_int;
gint64 value_int64;
GstDParamManager *manager;
GParamSpec *param_spec;
GType type;
gboolean ready_for_update;
gint64 next_update_timestamp;
gint64 last_update_timestamp;
gchar *unit_name;
gboolean is_log;
};
struct _GstDParamClass {
GstObjectClass parent_class;
/* signal callbacks */
void (*value_changed) (GstDParam *dparam);
};
GType gst_dparam_get_type (void);
GstDParam* gst_dparam_new (GType type);
void gst_dparam_attach (GstDParam *dparam, GstDParamManager *manager, GParamSpec *param_spec, gchar *unit_name);
void gst_dparam_detach (GstDParam *dparam);
void gst_dparam_do_update_default (GstDParam *dparam, gint64 timestamp, GValue *value, GstDParamUpdateInfo update_info);
G_END_DECLS
#endif /* __GST_DPARAM_H__ */