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e03f086fae
Convenient helper setting a caps feature on all the structures of a caps.
582 lines
19 KiB
C
582 lines
19 KiB
C
/* GStreamer
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* Copyright (C) 2003 David A. Schleef <ds@schleef.org>
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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_CAPS_H__
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#define __GST_CAPS_H__
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#include <gst/gstconfig.h>
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#include <gst/gstminiobject.h>
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#include <gst/gststructure.h>
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#include <gst/gstcapsfeatures.h>
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#include <gst/glib-compat.h>
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G_BEGIN_DECLS
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GST_API GType _gst_caps_type;
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#define GST_TYPE_CAPS (_gst_caps_type)
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#define GST_IS_CAPS(obj) (GST_IS_MINI_OBJECT_TYPE((obj), GST_TYPE_CAPS))
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#define GST_CAPS_CAST(obj) ((GstCaps*)(obj))
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#define GST_CAPS(obj) (GST_CAPS_CAST(obj))
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#define GST_TYPE_STATIC_CAPS (gst_static_caps_get_type())
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/**
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* GstCapsFlags:
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* @GST_CAPS_FLAG_ANY: Caps has no specific content, but can contain
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* anything.
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*
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* Extra flags for a caps.
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*/
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typedef enum {
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GST_CAPS_FLAG_ANY = (GST_MINI_OBJECT_FLAG_LAST << 0)
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} GstCapsFlags;
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/**
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* GstCapsIntersectMode:
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* @GST_CAPS_INTERSECT_ZIG_ZAG : Zig-zags over both caps.
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* @GST_CAPS_INTERSECT_FIRST : Keeps the first caps order.
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*
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* Modes of caps intersection
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*
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* @GST_CAPS_INTERSECT_ZIG_ZAG tries to preserve overall order of both caps
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* by iterating on the caps' structures as the following matrix shows:
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* |[
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* caps1
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* +-------------
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* | 1 2 4 7
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* caps2 | 3 5 8 10
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* | 6 9 11 12
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* ]|
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* Used when there is no explicit precedence of one caps over the other. e.g.
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* tee's sink pad getcaps function, it will probe its src pad peers' for their
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* caps and intersect them with this mode.
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*
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* @GST_CAPS_INTERSECT_FIRST is useful when an element wants to preserve
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* another element's caps priority order when intersecting with its own caps.
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* Example: If caps1 is [A, B, C] and caps2 is [E, B, D, A], the result
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* would be [A, B], maintaining the first caps priority on the intersection.
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*/
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typedef enum {
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GST_CAPS_INTERSECT_ZIG_ZAG = 0,
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GST_CAPS_INTERSECT_FIRST = 1
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} GstCapsIntersectMode;
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/**
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* GST_CAPS_ANY:
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*
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* Means that the element/pad can output 'anything'. Useful for elements
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* that output unknown media, such as filesrc. This macro returns a singleton and
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* should not be unreffed.
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*/
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#define GST_CAPS_ANY _gst_caps_any
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/**
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* GST_CAPS_NONE:
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*
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* The opposite of %GST_CAPS_ANY: it means that the pad/element outputs an
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* undefined media type that can not be detected. This macro returns a singleton
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* and should not be unreffed.
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*/
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#define GST_CAPS_NONE _gst_caps_none
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/**
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* GST_STATIC_CAPS_ANY:
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*
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* Creates a new #GstCaps static caps that matches anything.
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* This can be used in pad templates.
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*/
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#define GST_STATIC_CAPS_ANY GST_STATIC_CAPS("ANY")
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/**
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* GST_STATIC_CAPS_NONE:
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*
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* Creates a new #GstCaps static caps that matches nothing.
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* This can be used in pad templates.
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*/
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#define GST_STATIC_CAPS_NONE GST_STATIC_CAPS("NONE")
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/**
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* GST_CAPS_IS_SIMPLE:
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* @caps: the #GstCaps instance to check
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*
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* Convenience macro that checks if the number of structures in the given caps
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* is exactly one.
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*/
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#define GST_CAPS_IS_SIMPLE(caps) (gst_caps_get_size(caps) == 1)
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/**
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* GST_STATIC_CAPS:
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* @string: the string describing the caps
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*
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* Creates a new #GstCaps static caps from an input string.
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* This can be used in pad templates.
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*/
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#define GST_STATIC_CAPS(string) \
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{ \
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/* caps */ NULL, \
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/* string */ string, \
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GST_PADDING_INIT \
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}
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typedef struct _GstCaps GstCaps;
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typedef struct _GstStaticCaps GstStaticCaps;
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GST_API GstCaps * _gst_caps_any;
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GST_API GstCaps * _gst_caps_none;
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/**
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* GST_CAPS_FLAGS:
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* @caps: a #GstCaps.
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*
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* A flags word containing #GstCapsFlags flags set on this caps.
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*/
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#define GST_CAPS_FLAGS(caps) GST_MINI_OBJECT_FLAGS(caps)
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/* refcount */
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/**
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* GST_CAPS_REFCOUNT:
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* @caps: a #GstCaps
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*
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* Get access to the reference count field of the caps
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*/
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#define GST_CAPS_REFCOUNT(caps) GST_MINI_OBJECT_REFCOUNT(caps)
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/**
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* GST_CAPS_REFCOUNT_VALUE:
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* @caps: a #GstCaps
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*
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* Get the reference count value of the caps.
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*/
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#define GST_CAPS_REFCOUNT_VALUE(caps) GST_MINI_OBJECT_REFCOUNT_VALUE(caps)
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/**
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* GST_CAPS_FLAG_IS_SET:
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* @caps: a #GstCaps.
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* @flag: the #GstCapsFlags to check.
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*
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* Gives the status of a specific flag on a caps.
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*/
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#define GST_CAPS_FLAG_IS_SET(caps,flag) GST_MINI_OBJECT_FLAG_IS_SET (caps, flag)
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/**
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* GST_CAPS_FLAG_SET:
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* @caps: a #GstCaps.
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* @flag: the #GstCapsFlags to set.
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*
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* Sets a caps flag on a caps.
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*/
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#define GST_CAPS_FLAG_SET(caps,flag) GST_MINI_OBJECT_FLAG_SET (caps, flag)
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/**
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* GST_CAPS_FLAG_UNSET:
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* @caps: a #GstCaps.
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* @flag: the #GstCapsFlags to clear.
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*
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* Clears a caps flag.
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*/
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#define GST_CAPS_FLAG_UNSET(caps,flag) GST_MINI_OBJECT_FLAG_UNSET (caps, flag)
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/* refcounting */
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/**
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* gst_caps_ref:
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* @caps: the #GstCaps to reference
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*
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* Add a reference to a #GstCaps object.
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*
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* From this point on, until the caller calls gst_caps_unref() or
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* gst_caps_make_writable(), it is guaranteed that the caps object will not
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* change. This means its structures won't change, etc. To use a #GstCaps
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* object, you must always have a refcount on it -- either the one made
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* implicitly by e.g. gst_caps_new_simple(), or via taking one explicitly with
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* this function.
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*
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* Returns: the same #GstCaps object.
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*/
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static inline GstCaps *
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gst_caps_ref (GstCaps * caps)
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{
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return (GstCaps *) gst_mini_object_ref (GST_MINI_OBJECT_CAST (caps));
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}
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/**
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* gst_caps_unref:
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* @caps: a #GstCaps.
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*
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* Unref a #GstCaps and and free all its structures and the
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* structures' values when the refcount reaches 0.
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*/
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static inline void
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gst_caps_unref (GstCaps * caps)
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{
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gst_mini_object_unref (GST_MINI_OBJECT_CAST (caps));
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}
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/**
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* gst_clear_caps: (skip)
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* @caps_ptr: a pointer to a #GstCaps reference
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*
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* Clears a reference to a #GstCaps.
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*
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* @caps_ptr must not be %NULL.
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*
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* If the reference is %NULL then this function does nothing. Otherwise, the
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* reference count of the caps is decreased and the pointer is set to %NULL.
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*
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* Since: 1.16
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*/
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static inline void
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gst_clear_caps (GstCaps ** caps_ptr)
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{
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gst_clear_mini_object ((GstMiniObject **) caps_ptr);
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}
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/* copy caps */
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GST_API
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GstCaps * gst_caps_copy (const GstCaps * caps);
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#define gst_caps_copy(caps) GST_CAPS (gst_mini_object_copy (GST_MINI_OBJECT_CAST (caps)))
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/**
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* gst_caps_is_writable:
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* @caps: a #GstCaps
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*
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* Tests if you can safely modify @caps. It is only safe to modify caps when
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* there is only one owner of the caps - ie, the object is writable.
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*/
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#define gst_caps_is_writable(caps) gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (caps))
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/**
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* gst_caps_make_writable:
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* @caps: (transfer full): a #GstCaps
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*
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* Returns a writable copy of @caps.
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*
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* If there is only one reference count on @caps, the caller must be the owner,
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* and so this function will return the caps object unchanged. If on the other
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* hand there is more than one reference on the object, a new caps object will
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* be returned. The caller's reference on @caps will be removed, and instead the
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* caller will own a reference to the returned object.
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*
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* In short, this function unrefs the caps in the argument and refs the caps
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* that it returns. Don't access the argument after calling this function. See
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* also: gst_caps_ref().
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*
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* Returns: (transfer full): a writable caps which may or may not be the
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* same as @caps
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*/
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#define gst_caps_make_writable(caps) GST_CAPS_CAST (gst_mini_object_make_writable (GST_MINI_OBJECT_CAST (caps)))
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/**
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* gst_caps_replace:
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* @old_caps: (inout) (transfer full) (nullable): pointer to a pointer
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* to a #GstCaps to be replaced.
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* @new_caps: (transfer none) (allow-none): pointer to a #GstCaps that will
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* replace the caps pointed to by @old_caps.
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*
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* Modifies a pointer to a #GstCaps to point to a different #GstCaps. The
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* modification is done atomically (so this is useful for ensuring thread safety
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* in some cases), and the reference counts are updated appropriately (the old
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* caps is unreffed, the new is reffed).
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*
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* Either @new_caps or the #GstCaps pointed to by @old_caps may be %NULL.
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*
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* Returns: %TRUE if @new_caps was different from @old_caps
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*/
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static inline gboolean
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gst_caps_replace (GstCaps **old_caps, GstCaps *new_caps)
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{
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return gst_mini_object_replace ((GstMiniObject **) old_caps, (GstMiniObject *) new_caps);
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}
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/**
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* gst_caps_take:
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* @old_caps: (inout) (transfer full): pointer to a pointer to a #GstCaps to be
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* replaced.
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* @new_caps: (transfer full) (allow-none): pointer to a #GstCaps that will
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* replace the caps pointed to by @old_caps.
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*
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* Modifies a pointer to a #GstCaps to point to a different #GstCaps. This
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* function is similar to gst_caps_replace() except that it takes ownership
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* of @new_caps.
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*
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* Returns: %TRUE if @new_caps was different from @old_caps
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*/
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static inline gboolean
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gst_caps_take (GstCaps **old_caps, GstCaps *new_caps)
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{
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return gst_mini_object_take ((GstMiniObject **) old_caps, (GstMiniObject *) new_caps);
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}
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/**
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* GstCaps:
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* @mini_object: the parent type
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*
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* Object describing media types.
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*/
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struct _GstCaps {
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GstMiniObject mini_object;
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};
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/**
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* GstStaticCaps:
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* @caps: the cached #GstCaps
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* @string: a string describing a caps
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*
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* Datastructure to initialize #GstCaps from a string description usually
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* used in conjunction with GST_STATIC_CAPS() and gst_static_caps_get() to
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* instantiate a #GstCaps.
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*/
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struct _GstStaticCaps {
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/*< public >*/
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GstCaps *caps;
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const char *string;
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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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* GstCapsForeachFunc:
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* @features: the #GstCapsFeatures
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* @structure: the #GstStructure
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* @user_data: user data
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*
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* A function that will be called in gst_caps_foreach(). The function may
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* not modify @features or @structure.
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*
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* Returns: %TRUE if the foreach operation should continue, %FALSE if
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* the foreach operation should stop with %FALSE.
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*
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* Since: 1.6
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*/
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typedef gboolean (*GstCapsForeachFunc) (GstCapsFeatures *features,
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GstStructure *structure,
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gpointer user_data);
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/**
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* GstCapsMapFunc:
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* @features: the #GstCapsFeatures
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* @structure: the #GstStructure
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* @user_data: user data
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*
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* A function that will be called in gst_caps_map_in_place(). The function
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* may modify @features and @structure.
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*
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* Returns: %TRUE if the map operation should continue, %FALSE if
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* the map operation should stop with %FALSE.
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*/
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typedef gboolean (*GstCapsMapFunc) (GstCapsFeatures *features,
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GstStructure *structure,
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gpointer user_data);
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/**
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* GstCapsFilterMapFunc:
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* @features: the #GstCapsFeatures
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* @structure: the #GstStructure
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* @user_data: user data
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*
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* A function that will be called in gst_caps_filter_and_map_in_place().
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* The function may modify @features and @structure, and both will be
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* removed from the caps if %FALSE is returned.
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*
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* Returns: %TRUE if the features and structure should be preserved,
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* %FALSE if it should be removed.
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*/
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typedef gboolean (*GstCapsFilterMapFunc) (GstCapsFeatures *features,
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GstStructure *structure,
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gpointer user_data);
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GST_API
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GType gst_caps_get_type (void);
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GST_API
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GstCaps * gst_caps_new_empty (void);
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GST_API
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GstCaps * gst_caps_new_any (void);
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GST_API
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GstCaps * gst_caps_new_empty_simple (const char *media_type) G_GNUC_WARN_UNUSED_RESULT;
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GST_API
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GstCaps * gst_caps_new_simple (const char *media_type,
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const char *fieldname,
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...) G_GNUC_NULL_TERMINATED G_GNUC_WARN_UNUSED_RESULT;
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GST_API
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GstCaps * gst_caps_new_full (GstStructure *struct1,
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...) G_GNUC_NULL_TERMINATED G_GNUC_WARN_UNUSED_RESULT;
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GST_API
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GstCaps * gst_caps_new_full_valist (GstStructure *structure,
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va_list var_args) G_GNUC_WARN_UNUSED_RESULT;
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GST_API
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GType gst_static_caps_get_type (void);
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GST_API
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GstCaps * gst_static_caps_get (GstStaticCaps *static_caps);
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GST_API
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void gst_static_caps_cleanup (GstStaticCaps *static_caps);
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/* manipulation */
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GST_API
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void gst_caps_append (GstCaps *caps1,
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GstCaps *caps2);
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GST_API
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void gst_caps_append_structure (GstCaps *caps,
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GstStructure *structure);
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GST_API
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void gst_caps_append_structure_full (GstCaps *caps,
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GstStructure *structure,
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GstCapsFeatures *features);
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GST_API
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void gst_caps_remove_structure (GstCaps *caps, guint idx);
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GST_API
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GstCaps * gst_caps_merge (GstCaps *caps1,
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GstCaps *caps2) G_GNUC_WARN_UNUSED_RESULT;
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GST_API
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GstCaps * gst_caps_merge_structure (GstCaps *caps,
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GstStructure *structure) G_GNUC_WARN_UNUSED_RESULT;
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GST_API
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GstCaps * gst_caps_merge_structure_full (GstCaps *caps,
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GstStructure *structure,
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GstCapsFeatures *features) G_GNUC_WARN_UNUSED_RESULT;
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GST_API
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guint gst_caps_get_size (const GstCaps *caps);
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GST_API
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GstStructure * gst_caps_get_structure (const GstCaps *caps,
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guint index);
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GST_API
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GstStructure * gst_caps_steal_structure (GstCaps *caps,
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guint index) G_GNUC_WARN_UNUSED_RESULT;
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GST_API
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void gst_caps_set_features (GstCaps *caps,
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guint index,
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GstCapsFeatures * features);
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GST_API
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void gst_caps_set_features_simple (GstCaps *caps,
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GstCapsFeatures * features);
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GST_API
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GstCapsFeatures * gst_caps_get_features (const GstCaps *caps,
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guint index);
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GST_API
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GstCaps * gst_caps_copy_nth (const GstCaps *caps, guint nth) G_GNUC_WARN_UNUSED_RESULT;
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GST_API
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GstCaps * gst_caps_truncate (GstCaps *caps) G_GNUC_WARN_UNUSED_RESULT;
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GST_API
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void gst_caps_set_value (GstCaps *caps,
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const char *field,
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const GValue *value);
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GST_API
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void gst_caps_set_simple (GstCaps *caps,
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const char *field, ...) G_GNUC_NULL_TERMINATED;
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GST_API
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void gst_caps_set_simple_valist (GstCaps *caps,
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const char *field,
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va_list varargs);
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GST_API
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gboolean gst_caps_foreach (const GstCaps *caps,
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GstCapsForeachFunc func,
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gpointer user_data);
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GST_API
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gboolean gst_caps_map_in_place (GstCaps *caps,
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GstCapsMapFunc func,
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gpointer user_data);
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GST_API
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void gst_caps_filter_and_map_in_place (GstCaps *caps,
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GstCapsFilterMapFunc func,
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gpointer user_data);
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/* tests */
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GST_API
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gboolean gst_caps_is_any (const GstCaps *caps);
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GST_API
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gboolean gst_caps_is_empty (const GstCaps *caps);
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GST_API
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gboolean gst_caps_is_fixed (const GstCaps *caps);
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GST_API
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gboolean gst_caps_is_always_compatible (const GstCaps *caps1,
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const GstCaps *caps2);
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GST_API
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gboolean gst_caps_is_subset (const GstCaps *subset,
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const GstCaps *superset);
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GST_API
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gboolean gst_caps_is_subset_structure (const GstCaps *caps,
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const GstStructure *structure);
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GST_API
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gboolean gst_caps_is_subset_structure_full (const GstCaps *caps,
|
|
const GstStructure *structure,
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const GstCapsFeatures *features);
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GST_API
|
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gboolean gst_caps_is_equal (const GstCaps *caps1,
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const GstCaps *caps2);
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GST_API
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gboolean gst_caps_is_equal_fixed (const GstCaps *caps1,
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const GstCaps *caps2);
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GST_API
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|
gboolean gst_caps_can_intersect (const GstCaps * caps1,
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|
const GstCaps * caps2);
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GST_API
|
|
gboolean gst_caps_is_strictly_equal (const GstCaps *caps1,
|
|
const GstCaps *caps2);
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|
|
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/* operations */
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GST_API
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GstCaps * gst_caps_intersect (GstCaps *caps1,
|
|
GstCaps *caps2) G_GNUC_WARN_UNUSED_RESULT;
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GST_API
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|
GstCaps * gst_caps_intersect_full (GstCaps *caps1,
|
|
GstCaps *caps2,
|
|
GstCapsIntersectMode mode) G_GNUC_WARN_UNUSED_RESULT;
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|
GST_API
|
|
GstCaps * gst_caps_subtract (GstCaps *minuend,
|
|
GstCaps *subtrahend) G_GNUC_WARN_UNUSED_RESULT;
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|
GST_API
|
|
GstCaps * gst_caps_normalize (GstCaps *caps) G_GNUC_WARN_UNUSED_RESULT;
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|
|
|
GST_API
|
|
GstCaps * gst_caps_simplify (GstCaps *caps) G_GNUC_WARN_UNUSED_RESULT;
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|
|
|
GST_API
|
|
GstCaps * gst_caps_fixate (GstCaps *caps) G_GNUC_WARN_UNUSED_RESULT;
|
|
|
|
/* utility */
|
|
|
|
GST_API
|
|
gchar * gst_caps_to_string (const GstCaps *caps) G_GNUC_MALLOC;
|
|
|
|
GST_API
|
|
GstCaps * gst_caps_from_string (const gchar *string) G_GNUC_WARN_UNUSED_RESULT;
|
|
|
|
#ifdef G_DEFINE_AUTOPTR_CLEANUP_FUNC
|
|
G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstCaps, gst_caps_unref)
|
|
#endif
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|
|
G_END_DECLS
|
|
|
|
#endif /* __GST_CAPS_H__ */
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