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7954eaaf25
For cases where you only need a media type and no other fields. https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/774#note_848664 Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/774>
221 lines
7.8 KiB
C
221 lines
7.8 KiB
C
/* GStreamer
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* Copyright (C) 2003 Benjamin Otte <in7y118@public.uni-hamburg.de>
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*
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* gsttypefind.h: typefinding subsystem
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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_TYPE_FIND_H__
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#define __GST_TYPE_FIND_H__
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#include <gst/gstcaps.h>
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#include <gst/gstplugin.h>
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#include <gst/gstpluginfeature.h>
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G_BEGIN_DECLS
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/**
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* GST_TYPE_FIND_REGISTER_DEFINE_CUSTOM:
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* @type_find: The type find name in lower case, with words separated by '_'.
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* Used to generate `gst_type_find_register_*(GstPlugin* plugin)`.
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* @register_func: pointer to a method with the format: `gboolean register_func (GstPlugin* plugin);`
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*
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* A convenience macro to define the entry point of a
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* type find `gst_type_find_register_*(GstPlugin* plugin)` which uses
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* register_func as the main registration method for the type find.
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* As an example, you may define the type find named "custom-typefind"
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* as following using `type_find_register_custom`:
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*
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* ```
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* GST_TYPE_FIND_REGISTER_DEFINE_CUSTOM (plugin, type_find_register_custom)
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* ```
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*
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* Since: 1.20
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*/
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#define GST_TYPE_FIND_REGISTER_DEFINE_CUSTOM(type_find, register_func) \
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G_BEGIN_DECLS \
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gboolean G_PASTE (gst_type_find_register_, type_find) (GstPlugin * plugin) \
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{ \
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return register_func (plugin); \
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} \
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G_END_DECLS
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/**
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* GST_TYPE_FIND_REGISTER_DEFINE:
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* @t_f: The type find name in lower case, with words separated by '_'.
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* Used to generate `gst_type_find_register_*(GstPlugin* plugin)`.
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* @t_f_n: The public name of the type find
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* @r: The #GstRank of the type find (higher rank means more importance when autoplugging, see #GstRank)
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* @func: The #GstTypeFindFunction to use
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* @extensions: (nullable): Optional comma-separated list of extensions
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* that could belong to this type
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* @possible_caps: (nullable): Optionally the caps that could be returned when typefinding
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* succeeds
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* @data: Optional user data. This user data must be available until the plugin
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* is unloaded.
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* @data_notify: a #GDestroyNotify that will be called on @data when the plugin
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* is unloaded.
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*
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* A convenience macro to define the entry point of a
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* type find `gst_type_find_register_*(GstPlugin* plugin)`.
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*
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* Since: 1.20
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*/
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#define GST_TYPE_FIND_REGISTER_DEFINE(t_f, t_f_n, r, func, extensions, possible_caps, data, data_notify) \
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G_BEGIN_DECLS \
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gboolean G_PASTE (gst_type_find_register_, t_f) (GstPlugin * plugin) \
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{ \
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return gst_type_find_register (plugin, t_f_n, r, func, extensions, possible_caps, data, data_notify); \
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} \
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G_END_DECLS
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/**
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* GST_TYPE_FIND_REGISTER_DECLARE:
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* @t_f: The type find name in lower case, with words separated by '_'.
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*
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* This macro can be used to declare a new type find.
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* It has to be used in combination with #GST_TYPE_FIND_REGISTER_DEFINE macro
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* and must be placed outside any block to declare the type find registration
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* function.
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*
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* Since: 1.20
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*/
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#define GST_TYPE_FIND_REGISTER_DECLARE(t_f) \
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G_BEGIN_DECLS \
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gboolean G_PASTE(gst_type_find_register_, t_f) (GstPlugin * plugin); \
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G_END_DECLS
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/**
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* GST_TYPE_FIND_REGISTER:
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* @t_f: The type find name in lower case, with words separated by '_'.
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* @plugin: The #GstPlugin where to register the type find.
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*
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* This macro can be used to register a type find into a #GstPlugin.
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* This method will be usually called in the plugin init function
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* but can also be called with a NULL plugin.
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*
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* Since: 1.20
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*/
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#define GST_TYPE_FIND_REGISTER(t_f, plugin) G_PASTE(gst_type_find_register_, t_f) (plugin)
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#define GST_TYPE_TYPE_FIND (gst_type_find_get_type())
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typedef struct _GstTypeFind GstTypeFind;
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/**
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* GstTypeFindFunction:
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* @find: A #GstTypeFind structure
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* @user_data: optional data to pass to the function
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*
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* A function that will be called by typefinding.
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*/
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typedef void (* GstTypeFindFunction) (GstTypeFind *find, gpointer user_data);
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/**
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* GstTypeFindProbability:
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* @GST_TYPE_FIND_NONE: type undetected.
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* @GST_TYPE_FIND_MINIMUM: unlikely typefind.
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* @GST_TYPE_FIND_POSSIBLE: possible type detected.
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* @GST_TYPE_FIND_LIKELY: likely a type was detected.
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* @GST_TYPE_FIND_NEARLY_CERTAIN: nearly certain that a type was detected.
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* @GST_TYPE_FIND_MAXIMUM: very certain a type was detected.
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*
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* The probability of the typefind function. Higher values have more certainty
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* in doing a reliable typefind.
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*/
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typedef enum {
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GST_TYPE_FIND_NONE = 0,
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GST_TYPE_FIND_MINIMUM = 1,
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GST_TYPE_FIND_POSSIBLE = 50,
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GST_TYPE_FIND_LIKELY = 80,
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GST_TYPE_FIND_NEARLY_CERTAIN = 99,
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GST_TYPE_FIND_MAXIMUM = 100
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} GstTypeFindProbability;
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/**
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* GstTypeFind:
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* @peek: Method to peek data.
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* @suggest: Method to suggest #GstCaps with a given probability.
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* @data: The data used by the caller of the typefinding function.
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* @get_length: Returns the length of current data.
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*
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* Object that stores typefind callbacks. To use with #GstTypeFindFactory.
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*/
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struct _GstTypeFind {
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/* private to the caller of the typefind function */
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const guint8 * (* peek) (gpointer data,
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gint64 offset,
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guint size);
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void (* suggest) (gpointer data,
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guint probability,
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GstCaps *caps);
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gpointer data;
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/* optional */
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guint64 (* get_length) (gpointer data);
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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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* gst_type_find_get_type: (attributes doc.skip=true)
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*/
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GST_API
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GType gst_type_find_get_type (void);
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/* typefind function interface */
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GST_API
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const guint8 * gst_type_find_peek (GstTypeFind * find,
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gint64 offset,
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guint size);
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GST_API
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void gst_type_find_suggest (GstTypeFind * find,
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guint probability,
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GstCaps * caps);
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GST_API
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void gst_type_find_suggest_empty_simple (GstTypeFind * find,
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guint probability,
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const char * media_type);
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GST_API
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void gst_type_find_suggest_simple (GstTypeFind * find,
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guint probability,
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const char * media_type,
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const char * fieldname, ...) G_GNUC_NULL_TERMINATED;
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GST_API
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guint64 gst_type_find_get_length (GstTypeFind * find);
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/* registration interface */
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GST_API
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gboolean gst_type_find_register (GstPlugin * plugin,
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const gchar * name,
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guint rank,
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GstTypeFindFunction func,
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const gchar * extensions,
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GstCaps * possible_caps,
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gpointer data,
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GDestroyNotify data_notify);
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G_END_DECLS
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#endif /* __GST_TYPE_FIND_H__ */
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