gstreamer/gst/gsttypefind.h

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/* GStreamer
* Copyright (C) 2003 Benjamin Otte <in7y118@public.uni-hamburg.de>
*
* gsttypefind.h: typefinding subsystem
*
* 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_TYPE_FIND_H__
#define __GST_TYPE_FIND_H__
#include <gst/gstbuffer.h>
#include <gst/gstcaps.h>
#include <gst/gstplugin.h>
#include <gst/gstpluginfeature.h>
#include <gst/gsttypes.h>
G_BEGIN_DECLS
#define GST_TYPE_TYPE_FIND_FACTORY (gst_type_find_factory_get_type())
#define GST_TYPE_FIND_FACTORY(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_TYPE_FIND_FACTORY, GstTypeFindFactory))
#define GST_IS_TYPE_FIND_FACTORY(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_TYPE_FIND_FACTORY))
#define GST_TYPE_FIND_FACTORY_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_TYPE_FIND_FACTORY, GstTypeFindFactoryClass))
#define GST_IS_TYPE_FIND_FACTORY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_TYPE_FIND_FACTORY))
#define GST_TYPE_FIND_FACTORY_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_TYPE_FIND_FACTORY, GstTypeFindFactoryClass))
typedef struct _GstTypeFind GstTypeFind;
typedef struct _GstTypeFindFactory GstTypeFindFactory;
typedef struct _GstTypeFindFactoryClass GstTypeFindFactoryClass;
typedef void (* GstTypeFindFunction) (GstTypeFind *find, gpointer data);
typedef enum {
GST_TYPE_FIND_MINIMUM = 1,
GST_TYPE_FIND_POSSIBLE = 50,
GST_TYPE_FIND_LIKELY = 80,
GST_TYPE_FIND_NEARLY_CERTAIN = 99,
GST_TYPE_FIND_MAXIMUM = 100,
} GstTypeFindProbability;
struct _GstTypeFind {
/* private to the caller of the typefind function */
guint8 * (* peek) (gpointer data,
gint64 offset,
guint size);
void (* suggest) (gpointer data,
guint probability,
GstCaps * caps);
gpointer data;
/* optional */
guint64 (* get_length) (gpointer data);
/* <private> */
GST_STRUCT_PADDING
};
struct _GstTypeFindFactory {
GstPluginFeature feature;
/* <private> */
GstTypeFindFunction function;
gchar ** extensions;
GstCaps * caps; /* FIXME: not yet saved in registry */
gpointer user_data;
GST_OBJECT_PADDING
};
struct _GstTypeFindFactoryClass {
GstPluginFeatureClass parent;
/* <private> */
GST_CLASS_PADDING
};
/* typefind function interface */
guint8 * gst_type_find_peek (GstTypeFind * find,
gint64 offset,
guint size);
void gst_type_find_suggest (GstTypeFind * find,
guint probability,
GstCaps * caps);
guint64 gst_type_find_get_length (GstTypeFind * find);
/* registration interface */
gboolean gst_type_find_register (GstPlugin * plugin,
const gchar * name,
guint rank,
GstTypeFindFunction func,
gchar ** extensions,
GstCaps * possible_caps,
gpointer data);
/* typefinding interface */
GType gst_type_find_factory_get_type (void);
GList * gst_type_find_factory_get_list (void);
gchar ** gst_type_find_factory_get_extensions (const GstTypeFindFactory *factory);
GstCaps * gst_type_find_factory_get_caps (const GstTypeFindFactory *factory);
void gst_type_find_factory_call_function (const GstTypeFindFactory *factory,
GstTypeFind *find);
G_END_DECLS
#endif /* __GST_TYPE_FIND_H__ */