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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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09141c6e1f
Since we started depending on GLib 2.44, we can be sure this macro is defined (it will be a no-op on compilers that don't support it). For plugins we should just start using `G_DECLARE_FINAL_TYPE` which means we no longer need the macro there, but for most types in core we don't want to break ABI, which means it's better to just keep it like it is (and use the `#ifdef` instead).
587 lines
20 KiB
C
587 lines
20 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: (skip)
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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 * gst_caps_ref (GstCaps * caps);
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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: (skip)
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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 gst_caps_unref (GstCaps * caps);
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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: (skip)
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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 gst_caps_replace (GstCaps **old_caps, GstCaps *new_caps);
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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: (skip)
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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 gst_caps_take (GstCaps **old_caps, GstCaps *new_caps);
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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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/**
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* gst_static_caps_get_type: (attributes doc.skip=true)
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*/
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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,
|
|
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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|
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GST_API
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GstCapsFeatures * gst_caps_get_features (const GstCaps *caps,
|
|
guint index);
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|
GST_API
|
|
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
|
|
void gst_caps_set_value (GstCaps *caps,
|
|
const char *field,
|
|
const GValue *value);
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|
GST_API
|
|
void gst_caps_set_simple (GstCaps *caps,
|
|
const char *field, ...) G_GNUC_NULL_TERMINATED;
|
|
GST_API
|
|
void gst_caps_set_simple_valist (GstCaps *caps,
|
|
const char *field,
|
|
va_list varargs);
|
|
GST_API
|
|
gboolean gst_caps_foreach (const GstCaps *caps,
|
|
GstCapsForeachFunc func,
|
|
gpointer user_data);
|
|
GST_API
|
|
gboolean gst_caps_map_in_place (GstCaps *caps,
|
|
GstCapsMapFunc func,
|
|
gpointer user_data);
|
|
GST_API
|
|
void gst_caps_filter_and_map_in_place (GstCaps *caps,
|
|
GstCapsFilterMapFunc func,
|
|
gpointer user_data);
|
|
|
|
/* tests */
|
|
|
|
GST_API
|
|
gboolean gst_caps_is_any (const GstCaps *caps);
|
|
|
|
GST_API
|
|
gboolean gst_caps_is_empty (const GstCaps *caps);
|
|
|
|
GST_API
|
|
gboolean gst_caps_is_fixed (const GstCaps *caps);
|
|
|
|
GST_API
|
|
gboolean gst_caps_is_always_compatible (const GstCaps *caps1,
|
|
const GstCaps *caps2);
|
|
GST_API
|
|
gboolean gst_caps_is_subset (const GstCaps *subset,
|
|
const GstCaps *superset);
|
|
GST_API
|
|
gboolean gst_caps_is_subset_structure (const GstCaps *caps,
|
|
const GstStructure *structure);
|
|
GST_API
|
|
gboolean gst_caps_is_subset_structure_full (const GstCaps *caps,
|
|
const GstStructure *structure,
|
|
const GstCapsFeatures *features);
|
|
GST_API
|
|
gboolean gst_caps_is_equal (const GstCaps *caps1,
|
|
const GstCaps *caps2);
|
|
GST_API
|
|
gboolean gst_caps_is_equal_fixed (const GstCaps *caps1,
|
|
const GstCaps *caps2);
|
|
GST_API
|
|
gboolean gst_caps_can_intersect (const GstCaps * caps1,
|
|
const GstCaps * caps2);
|
|
GST_API
|
|
gboolean gst_caps_is_strictly_equal (const GstCaps *caps1,
|
|
const GstCaps *caps2);
|
|
|
|
|
|
/* operations */
|
|
|
|
GST_API
|
|
GstCaps * gst_caps_intersect (GstCaps *caps1,
|
|
GstCaps *caps2) G_GNUC_WARN_UNUSED_RESULT;
|
|
GST_API
|
|
GstCaps * gst_caps_intersect_full (GstCaps *caps1,
|
|
GstCaps *caps2,
|
|
GstCapsIntersectMode mode) G_GNUC_WARN_UNUSED_RESULT;
|
|
GST_API
|
|
GstCaps * gst_caps_subtract (GstCaps *minuend,
|
|
GstCaps *subtrahend) G_GNUC_WARN_UNUSED_RESULT;
|
|
GST_API
|
|
GstCaps * gst_caps_normalize (GstCaps *caps) G_GNUC_WARN_UNUSED_RESULT;
|
|
|
|
GST_API
|
|
GstCaps * gst_caps_simplify (GstCaps *caps) G_GNUC_WARN_UNUSED_RESULT;
|
|
|
|
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;
|
|
|
|
G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstCaps, gst_caps_unref)
|
|
|
|
G_END_DECLS
|
|
|
|
#endif /* __GST_CAPS_H__ */
|