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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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef __GST_TYPE_FIND_H__
#define __GST_TYPE_FIND_H__
#include <gst/gstcaps.h>
#include <gst/gstplugin.h>
#include <gst/gstpluginfeature.h>
G_BEGIN_DECLS
#define GST_TYPE_TYPE_FIND (gst_type_find_get_type())
typedef struct _GstTypeFind GstTypeFind;
/**
* GstTypeFindFunction:
* @find: A #GstTypeFind structure
* @user_data: optional data to pass to the function
*
* A function that will be called by typefinding.
*/
typedef void (* GstTypeFindFunction) (GstTypeFind *find, gpointer user_data);
/**
* GstTypeFindProbability:
* @GST_TYPE_FIND_NONE: type undetected.
* @GST_TYPE_FIND_MINIMUM: unlikely typefind.
* @GST_TYPE_FIND_POSSIBLE: possible type detected.
* @GST_TYPE_FIND_LIKELY: likely a type was detected.
* @GST_TYPE_FIND_NEARLY_CERTAIN: nearly certain that a type was detected.
* @GST_TYPE_FIND_MAXIMUM: very certain a type was detected.
*
* The probability of the typefind function. Higher values have more certainty
* in doing a reliable typefind.
*/
typedef enum {
GST_TYPE_FIND_NONE = 0,
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;
/**
* GstTypeFind:
* @peek: Method to peek data.
* @suggest: Method to suggest #GstCaps with a given probability.
* @data: The data used by the caller of the typefinding function.
* @get_length: Returns the length of current data.
*
* Object that stores typefind callbacks. To use with #GstTypeFindFactory.
*/
struct _GstTypeFind {
/* private to the caller of the typefind function */
const 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> */
gpointer _gst_reserved[GST_PADDING];
};
GType gst_type_find_get_type (void);
/* typefind function interface */
const guint8 * gst_type_find_peek (GstTypeFind * find,
gint64 offset,
guint size);
void gst_type_find_suggest (GstTypeFind * find,
guint probability,
GstCaps * caps);
void gst_type_find_suggest_simple (GstTypeFind * find,
guint probability,
const char * media_type,
const char * fieldname, ...);
guint64 gst_type_find_get_length (GstTypeFind * find);
/* registration interface */
gboolean gst_type_find_register (GstPlugin * plugin,
const gchar * name,
guint rank,
GstTypeFindFunction func,
const gchar * extensions,
GstCaps * possible_caps,
gpointer data,
GDestroyNotify data_notify);
G_END_DECLS
#endif /* __GST_TYPE_FIND_H__ */
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