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0ff4086507
This patch adds gst_caps_set_value() and allows gst_caps_set_simple() to
work on non-simple caps. See the API documentation for the functions
about what they do.
The intention of these changes is to ease working with caps in caps
transform functions. An example for this would be ffmpegcolorspace,
where the caps transform function could be changed to look roughly like
this (pseudocode ahead):
result = gst_caps_copy (template_caps);
value = gst_structure_get_value (gst_caps_get_structure (caps, 0),
"widh");
gst_caps_set_value (result, value);
/* same for height, framerate and par */
return caps;
which is much cleaner and easier to understand than the current code.
https://bugzilla.gnome.org/show_bug.cgi?id=597690
259 lines
9 KiB
C
259 lines
9 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);
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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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