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31832d3c21
People often call gst_caps_make_writable (caps); instead of caps = gst_caps_make_writable (caps); and cause a bug. Warning about an unused return value helps here. See https://bugzilla.gnome.org/show_bug.cgi?id=616541#c2 for an example.
259 lines
9.1 KiB
C
259 lines
9.1 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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, 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/gststructure.h>
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#include <gst/glib-compat.h>
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G_BEGIN_DECLS
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#define GST_TYPE_CAPS (gst_caps_get_type())
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#define GST_CAPS(object) ((GstCaps*)object)
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#define GST_IS_CAPS(object) ((object) && (GST_CAPS(object)->type == GST_TYPE_CAPS))
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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_FLAGS_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_FLAGS_ANY = (1 << 0)
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} GstCapsFlags;
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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.
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*/
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#define GST_CAPS_ANY gst_caps_new_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.
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*/
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#define GST_CAPS_NONE gst_caps_new_empty()
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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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#ifndef GST_DISABLE_DEPRECATED
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/**
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* GST_DEBUG_CAPS:
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* @string: a string that should be prepended to the caps data.
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* @caps: the #GstCaps instance to print
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*
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* Convenience macro for printing out the contents of caps with GST_DEBUG().
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*
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* Deprecated: do not use anymore
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*/
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#define GST_DEBUG_CAPS(string, caps) \
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GST_DEBUG ( string "%s: " GST_PTR_FORMAT, caps)
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#endif /* GST_DISABLE_DEPRECATED */
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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 */ { 0, 0, (GstCapsFlags) 0, NULL, GST_PADDING_INIT }, \
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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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/* 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_CAPS(caps))->refcount)
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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) (g_atomic_int_get (&(GST_CAPS(caps))->refcount))
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/**
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* GstCaps:
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* @type: GType of the caps
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* @refcount: the atomic refcount value
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* @flags: extra flags for the caps, read only.
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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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GType type;
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/*< public >*/ /* with COW */
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/* refcounting */
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gint refcount;
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/*< public >*/ /* read only */
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GstCapsFlags flags;
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/*< private >*/
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GPtrArray *structs;
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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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* 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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GType gst_caps_get_type (void);
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GstCaps * gst_caps_new_empty (void);
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GstCaps * gst_caps_new_any (void);
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GstCaps * gst_caps_new_simple (const char *media_type,
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const char *fieldname,
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...);
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GstCaps * gst_caps_new_full (GstStructure *struct1, ...);
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GstCaps * gst_caps_new_full_valist (GstStructure *structure,
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va_list var_args);
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/* reference counting */
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GstCaps * gst_caps_ref (GstCaps *caps);
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GstCaps * gst_caps_copy (const GstCaps *caps);
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GstCaps * gst_caps_make_writable (GstCaps *caps) G_GNUC_WARN_UNUSED_RESULT;
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void gst_caps_unref (GstCaps *caps);
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GType gst_static_caps_get_type (void);
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GstCaps * gst_static_caps_get (GstStaticCaps *static_caps);
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/* manipulation */
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void gst_caps_append (GstCaps *caps1,
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GstCaps *caps2);
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void gst_caps_merge (GstCaps *caps1,
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GstCaps *caps2);
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void gst_caps_append_structure (GstCaps *caps,
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GstStructure *structure);
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void gst_caps_remove_structure (GstCaps *caps, guint idx);
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void gst_caps_merge_structure (GstCaps *caps,
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GstStructure *structure);
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guint gst_caps_get_size (const GstCaps *caps);
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GstStructure * gst_caps_get_structure (const GstCaps *caps,
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guint index);
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GstCaps * gst_caps_copy_nth (const GstCaps *caps, guint nth);
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void gst_caps_truncate (GstCaps *caps);
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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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void gst_caps_set_simple (GstCaps *caps,
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const char *field, ...) G_GNUC_NULL_TERMINATED;
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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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/* tests */
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gboolean gst_caps_is_any (const GstCaps *caps);
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gboolean gst_caps_is_empty (const GstCaps *caps);
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gboolean gst_caps_is_fixed (const GstCaps *caps);
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gboolean gst_caps_is_always_compatible (const GstCaps *caps1,
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const GstCaps *caps2);
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gboolean gst_caps_is_subset (const GstCaps *subset,
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const GstCaps *superset);
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gboolean gst_caps_is_equal (const GstCaps *caps1,
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const GstCaps *caps2);
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gboolean gst_caps_is_equal_fixed (const GstCaps *caps1,
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const GstCaps *caps2);
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gboolean gst_caps_can_intersect (const GstCaps * caps1,
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const GstCaps * caps2);
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/* operations */
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GstCaps * gst_caps_intersect (const GstCaps *caps1,
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const GstCaps *caps2);
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GstCaps * gst_caps_subtract (const GstCaps *minuend,
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const GstCaps *subtrahend);
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GstCaps * gst_caps_union (const GstCaps *caps1,
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const GstCaps *caps2);
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GstCaps * gst_caps_normalize (const GstCaps *caps);
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gboolean gst_caps_do_simplify (GstCaps *caps);
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#ifndef GST_DISABLE_LOADSAVE
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xmlNodePtr gst_caps_save_thyself (const GstCaps *caps,
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xmlNodePtr parent);
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GstCaps * gst_caps_load_thyself (xmlNodePtr parent);
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#endif
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/* utility */
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void gst_caps_replace (GstCaps **caps,
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GstCaps *newcaps);
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gchar * gst_caps_to_string (const GstCaps *caps);
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GstCaps * gst_caps_from_string (const gchar *string);
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G_END_DECLS
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#endif /* __GST_CAPS_H__ */
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