/* GStreamer * Copyright (C) 2003 David A. Schleef * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ #ifndef __GST_CAPS_H__ #define __GST_CAPS_H__ #include #include #include #include G_BEGIN_DECLS extern GType _gst_caps_type; #define GST_TYPE_CAPS (_gst_caps_type) #define GST_IS_CAPS(obj) (GST_IS_MINI_OBJECT_TYPE((obj), GST_TYPE_CAPS)) #define GST_CAPS_CAST(obj) ((GstCaps*)(obj)) #define GST_CAPS(obj) (GST_CAPS_CAST(obj)) #define GST_TYPE_STATIC_CAPS (gst_static_caps_get_type()) /** * GstCapsFlags: * @GST_CAPS_FLAGS_ANY: Caps has no specific content, but can contain * anything. * * Extra flags for a caps. */ typedef enum { GST_CAPS_FLAGS_ANY = (GST_MINI_OBJECT_FLAG_LAST << 0) } GstCapsFlags; /** * GstCapsIntersectMode: * @GST_CAPS_INTERSECT_ZIG_ZAG : Zig-zags over both caps. * @GST_CAPS_INTERSECT_FIRST : Keeps the first caps order. * * Modes of caps intersection * * @GST_CAPS_INTERSECT_ZIG_ZAG tries to preserve overall order of both caps * by iterating on the caps' structures as the following matrix shows: * |[ * caps1 * +------------- * | 1 2 4 7 * caps2 | 3 5 8 10 * | 6 9 11 12 * ]| * Used when there is no explicit precedence of one caps over the other. e.g. * tee's sink pad getcaps function, it will probe its src pad peers' for their * caps and intersect them with this mode. * * @GST_CAPS_INTERSECT_FIRST is useful when an element wants to preserve * another element's caps priority order when intersecting with its own caps. * Example: If caps1 is [A, B, C] and caps2 is [E, B, D, A], the result * would be [A, B], maintaining the first caps priority on the intersection. * * Since: 0.10.33 */ typedef enum { GST_CAPS_INTERSECT_ZIG_ZAG = 0, GST_CAPS_INTERSECT_FIRST = 1 } GstCapsIntersectMode; /** * GST_CAPS_ANY: * * Means that the element/pad can output 'anything'. Useful for elements * that output unknown media, such as filesrc. */ #define GST_CAPS_ANY gst_caps_new_any() /** * GST_CAPS_NONE: * * The opposite of %GST_CAPS_ANY: it means that the pad/element outputs an * undefined media type that can not be detected. */ #define GST_CAPS_NONE gst_caps_new_empty() /** * GST_STATIC_CAPS_ANY: * * Creates a new #GstCaps static caps that matches anything. * This can be used in pad templates. */ #define GST_STATIC_CAPS_ANY GST_STATIC_CAPS("ANY") /** * GST_STATIC_CAPS_NONE: * * Creates a new #GstCaps static caps that matches nothing. * This can be used in pad templates. */ #define GST_STATIC_CAPS_NONE GST_STATIC_CAPS("NONE") /** * GST_CAPS_IS_SIMPLE: * @caps: the #GstCaps instance to check * * Convenience macro that checks if the number of structures in the given caps * is exactly one. */ #define GST_CAPS_IS_SIMPLE(caps) (gst_caps_get_size(caps) == 1) /** * GST_STATIC_CAPS: * @string: the string describing the caps * * Creates a new #GstCaps static caps from an input string. * This can be used in pad templates. */ #define GST_STATIC_CAPS(string) \ { \ /* miniobject */ { { 0, 0, 0, 0, NULL, NULL, NULL }, \ /* caps */ NULL }, \ /* string */ string, \ GST_PADDING_INIT \ } typedef struct _GstCaps GstCaps; typedef struct _GstStaticCaps GstStaticCaps; /** * GST_CAPS_FLAGS: * @caps: a #GstCaps. * * A flags word containing #GstCapsFlags flags set on this caps. */ #define GST_CAPS_FLAGS(caps) GST_MINI_OBJECT_FLAGS(caps) /* refcount */ /** * GST_CAPS_REFCOUNT: * @caps: a #GstCaps * * Get access to the reference count field of the caps */ #define GST_CAPS_REFCOUNT(caps) GST_MINI_OBJECT_REFCOUNT(caps) /** * GST_CAPS_REFCOUNT_VALUE: * @caps: a #GstCaps * * Get the reference count value of the caps. */ #define GST_CAPS_REFCOUNT_VALUE(caps) GST_MINI_OBJECT_REFCOUNT_VALUE(caps) /** * GST_CAPS_FLAG_IS_SET: * @caps: a #GstCaps. * @flag: the #GstCapsFlags to check. * * Gives the status of a specific flag on a caps. */ #define GST_CAPS_FLAG_IS_SET(caps,flag) GST_MINI_OBJECT_FLAG_IS_SET (caps, flag) /** * GST_CAPS_FLAG_SET: * @caps: a #GstCaps. * @flag: the #GstCapsFlags to set. * * Sets a caps flag on a caps. */ #define GST_CAPS_FLAG_SET(caps,flag) GST_MINI_OBJECT_FLAG_SET (caps, flag) /** * GST_CAPS_FLAG_UNSET: * @caps: a #GstCaps. * @flag: the #GstCapsFlags to clear. * * Clears a caps flag. */ #define GST_CAPS_FLAG_UNSET(caps,flag) GST_MINI_OBJECT_FLAG_UNSET (caps, flag) /* refcounting */ /** * gst_caps_ref: * @caps: the #GstCaps to reference * * Add a reference to a #GstCaps object. * * From this point on, until the caller calls gst_caps_unref() or * gst_caps_make_writable(), it is guaranteed that the caps object will not * change. This means its structures won't change, etc. To use a #GstCaps * object, you must always have a refcount on it -- either the one made * implicitly by e.g. gst_caps_new_simple(), or via taking one explicitly with * this function. * * Returns: the same #GstCaps object. */ #ifdef _FOOL_GTK_DOC_ G_INLINE_FUNC GstCaps * gst_caps_ref (GstCaps * caps); #endif static inline GstCaps * gst_caps_ref (GstCaps * caps) { return (GstCaps *) gst_mini_object_ref (GST_MINI_OBJECT_CAST (caps)); } /** * gst_caps_unref: * @caps: a #GstCaps. * * Unref a #GstCaps and and free all its structures and the * structures' values when the refcount reaches 0. */ #ifdef _FOOL_GTK_DOC_ G_INLINE_FUNC void gst_caps_unref (GstCaps * caps); #endif static inline void gst_caps_unref (GstCaps * caps) { gst_mini_object_unref (GST_MINI_OBJECT_CAST (caps)); } /* copy caps */ /** * gst_caps_copy: * @caps: a #GstCaps. * * Creates a new #GstCaps as a copy of the old @caps. The new caps will have a * refcount of 1, owned by the caller. The structures are copied as well. * * Note that this function is the semantic equivalent of a gst_caps_ref() * followed by a gst_caps_make_writable(). If you only want to hold on to a * reference to the data, you should use gst_caps_ref(). * * When you are finished with the caps, call gst_caps_unref() on it. * * Returns: the new #GstCaps */ #ifdef _FOOL_GTK_DOC_ G_INLINE_FUNC GstCaps * gst_caps_copy (const GstCaps * caps); #endif static inline GstCaps * gst_caps_copy (const GstCaps * caps) { return GST_CAPS (gst_mini_object_copy (GST_MINI_OBJECT_CAST (caps))); } /** * gst_caps_is_writable: * @caps: a #GstCaps * * Tests if you can safely modify @caps. It is only safe to modify caps when * there is only one owner of the caps - ie, the refcount is 1. */ #define gst_caps_is_writable(caps) gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (caps)) /** * gst_caps_make_writable: * @caps: (transfer full): a #GstCaps * * Returns a writable copy of @caps. * * If there is only one reference count on @caps, the caller must be the owner, * and so this function will return the caps object unchanged. If on the other * hand there is more than one reference on the object, a new caps object will * be returned. The caller's reference on @caps will be removed, and instead the * caller will own a reference to the returned object. * * In short, this function unrefs the caps in the argument and refs the caps * that it returns. Don't access the argument after calling this function. See * also: gst_caps_ref(). * * Returns: (transfer full): a writable caps which may or may not be the * same as @caps */ #define gst_caps_make_writable(caps) GST_CAPS_CAST (gst_mini_object_make_writable (GST_MINI_OBJECT_CAST (caps))) /** * gst_caps_replace: * @ocaps: (inout) (transfer full): pointer to a pointer to a #GstCaps to be * replaced. * @ncaps: (transfer none) (allow-none): pointer to a #GstCaps that will * replace the caps pointed to by @ocaps. * * Modifies a pointer to a #GstCaps to point to a different #GstCaps. The * modification is done atomically (so this is useful for ensuring thread safety * in some cases), and the reference counts are updated appropriately (the old * caps is unreffed, the new is reffed). * * Either @ncaps or the #GstCaps pointed to by @ocaps may be NULL. */ #define gst_caps_replace(ocaps,ncaps) \ G_STMT_START { \ GstCaps **___ocapsaddr = (GstCaps **)(ocaps); \ gst_mini_object_replace ((GstMiniObject **)___ocapsaddr, \ GST_MINI_OBJECT_CAST (ncaps)); \ } G_STMT_END /** * GstCaps: * @mini_object: the parent type * * Object describing media types. */ struct _GstCaps { GstMiniObject mini_object; /*< private >*/ gpointer priv; }; /** * GstStaticCaps: * @caps: the cached #GstCaps * @string: a string describing a caps * * Datastructure to initialize #GstCaps from a string description usually * used in conjunction with GST_STATIC_CAPS() and gst_static_caps_get() to * instantiate a #GstCaps. */ struct _GstStaticCaps { /*< public >*/ GstCaps caps; const char *string; /*< private >*/ gpointer _gst_reserved[GST_PADDING]; }; GType gst_caps_get_type (void); GstCaps * gst_caps_new_empty (void); GstCaps * gst_caps_new_any (void); GstCaps * gst_caps_new_simple (const char *media_type, const char *fieldname, ...); GstCaps * gst_caps_new_full (GstStructure *struct1, ...); GstCaps * gst_caps_new_full_valist (GstStructure *structure, va_list var_args); GType gst_static_caps_get_type (void); GstCaps * gst_static_caps_get (GstStaticCaps *static_caps); void gst_static_caps_cleanup (GstStaticCaps *static_caps); /* manipulation */ void gst_caps_append (GstCaps *caps1, GstCaps *caps2); void gst_caps_merge (GstCaps *caps1, GstCaps *caps2); void gst_caps_append_structure (GstCaps *caps, GstStructure *structure); void gst_caps_remove_structure (GstCaps *caps, guint idx); void gst_caps_merge_structure (GstCaps *caps, GstStructure *structure); guint gst_caps_get_size (const GstCaps *caps); GstStructure * gst_caps_get_structure (const GstCaps *caps, guint index); GstStructure * gst_caps_steal_structure (GstCaps *caps, guint index); GstCaps * gst_caps_copy_nth (const GstCaps *caps, guint nth); void gst_caps_truncate (GstCaps *caps); void gst_caps_set_value (GstCaps *caps, const char *field, const GValue *value); void gst_caps_set_simple (GstCaps *caps, const char *field, ...) G_GNUC_NULL_TERMINATED; void gst_caps_set_simple_valist (GstCaps *caps, const char *field, va_list varargs); /* tests */ gboolean gst_caps_is_any (const GstCaps *caps); gboolean gst_caps_is_empty (const GstCaps *caps); gboolean gst_caps_is_fixed (const GstCaps *caps); gboolean gst_caps_is_always_compatible (const GstCaps *caps1, const GstCaps *caps2); gboolean gst_caps_is_subset (const GstCaps *subset, const GstCaps *superset); gboolean gst_caps_is_subset_structure (const GstCaps *caps, const GstStructure *structure); gboolean gst_caps_is_equal (const GstCaps *caps1, const GstCaps *caps2); gboolean gst_caps_is_equal_fixed (const GstCaps *caps1, const GstCaps *caps2); gboolean gst_caps_can_intersect (const GstCaps * caps1, const GstCaps * caps2); /* operations */ GstCaps * gst_caps_intersect (const GstCaps *caps1, const GstCaps *caps2); GstCaps * gst_caps_intersect_full (const GstCaps *caps1, const GstCaps *caps2, GstCapsIntersectMode mode); GstCaps * gst_caps_subtract (const GstCaps *minuend, const GstCaps *subtrahend); GstCaps * gst_caps_union (const GstCaps *caps1, const GstCaps *caps2); GstCaps * gst_caps_normalize (const GstCaps *caps); gboolean gst_caps_do_simplify (GstCaps *caps); void gst_caps_fixate (GstCaps *caps); /* utility */ gchar * gst_caps_to_string (const GstCaps *caps); GstCaps * gst_caps_from_string (const gchar *string); G_END_DECLS #endif /* __GST_CAPS_H__ */