| /* GStreamer |
| * Copyright (C) 2003 David A. Schleef <ds@schleef.org> |
| * |
| * 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., 51 Franklin St, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| */ |
| |
| #ifndef __GST_CAPS_H__ |
| #define __GST_CAPS_H__ |
| |
| #include <gst/gstconfig.h> |
| #include <gst/gstminiobject.h> |
| #include <gst/gststructure.h> |
| #include <gst/gstcapsfeatures.h> |
| #include <gst/glib-compat.h> |
| |
| G_BEGIN_DECLS |
| |
| GST_EXPORT 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_FLAG_ANY: Caps has no specific content, but can contain |
| * anything. |
| * |
| * Extra flags for a caps. |
| */ |
| typedef enum { |
| GST_CAPS_FLAG_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. |
| */ |
| 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. This macro returns a singleton and |
| * should not be unreffed. |
| */ |
| #define GST_CAPS_ANY _gst_caps_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. This macro returns a singleton |
| * and should not be unreffed. |
| */ |
| #define GST_CAPS_NONE _gst_caps_none |
| |
| /** |
| * 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) \ |
| { \ |
| /* caps */ NULL, \ |
| /* string */ string, \ |
| GST_PADDING_INIT \ |
| } |
| |
| typedef struct _GstCaps GstCaps; |
| typedef struct _GstStaticCaps GstStaticCaps; |
| |
| GST_EXPORT GstCaps * _gst_caps_any; |
| GST_EXPORT GstCaps * _gst_caps_none; |
| /** |
| * 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. |
| */ |
| 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. |
| */ |
| 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 |
| */ |
| 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 object is writable. |
| */ |
| #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: |
| * @old_caps: (inout) (transfer full) (nullable): pointer to a pointer |
| * to a #GstCaps to be replaced. |
| * @new_caps: (transfer none) (allow-none): pointer to a #GstCaps that will |
| * replace the caps pointed to by @old_caps. |
| * |
| * 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 @new_caps or the #GstCaps pointed to by @old_caps may be %NULL. |
| * |
| * Returns: %TRUE if @new_caps was different from @old_caps |
| */ |
| static inline gboolean |
| gst_caps_replace (GstCaps **old_caps, GstCaps *new_caps) |
| { |
| return gst_mini_object_replace ((GstMiniObject **) old_caps, (GstMiniObject *) new_caps); |
| } |
| |
| /** |
| * gst_caps_take: |
| * @old_caps: (inout) (transfer full): pointer to a pointer to a #GstCaps to be |
| * replaced. |
| * @new_caps: (transfer full) (allow-none): pointer to a #GstCaps that will |
| * replace the caps pointed to by @old_caps. |
| * |
| * Modifies a pointer to a #GstCaps to point to a different #GstCaps. This |
| * function is similar to gst_caps_replace() except that it takes ownership |
| * of @new_caps. |
| * |
| * Returns: %TRUE if @new_caps was different from @old_caps |
| */ |
| static inline gboolean |
| gst_caps_take (GstCaps **old_caps, GstCaps *new_caps) |
| { |
| return gst_mini_object_take ((GstMiniObject **) old_caps, (GstMiniObject *) new_caps); |
| } |
| |
| /** |
| * GstCaps: |
| * @mini_object: the parent type |
| * |
| * Object describing media types. |
| */ |
| struct _GstCaps { |
| GstMiniObject mini_object; |
| }; |
| |
| /** |
| * 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]; |
| }; |
| |
| /** |
| * GstCapsForeachFunc: |
| * @features: the #GstCapsFeatures |
| * @structure: the #GstStructure |
| * @user_data: user data |
| * |
| * A function that will be called in gst_caps_foreach(). The function may |
| * not modify @features or @structure. |
| * |
| * Returns: %TRUE if the foreach operation should continue, %FALSE if |
| * the foreach operation should stop with %FALSE. |
| * |
| * Since: 1.6 |
| */ |
| typedef gboolean (*GstCapsForeachFunc) (GstCapsFeatures *features, |
| GstStructure *structure, |
| gpointer user_data); |
| |
| /** |
| * GstCapsMapFunc: |
| * @features: the #GstCapsFeatures |
| * @structure: the #GstStructure |
| * @user_data: user data |
| * |
| * A function that will be called in gst_caps_map_in_place(). The function |
| * may modify @features and @structure. |
| * |
| * Returns: %TRUE if the map operation should continue, %FALSE if |
| * the map operation should stop with %FALSE. |
| */ |
| typedef gboolean (*GstCapsMapFunc) (GstCapsFeatures *features, |
| GstStructure *structure, |
| gpointer user_data); |
| |
| /** |
| * GstCapsFilterMapFunc: |
| * @features: the #GstCapsFeatures |
| * @structure: the #GstStructure |
| * @user_data: user data |
| * |
| * A function that will be called in gst_caps_filter_and_map_in_place(). |
| * The function may modify @features and @structure, and both will be |
| * removed from the caps if %FALSE is returned. |
| * |
| * Returns: %TRUE if the features and structure should be preserved, |
| * %FALSE if it should be removed. |
| */ |
| typedef gboolean (*GstCapsFilterMapFunc) (GstCapsFeatures *features, |
| GstStructure *structure, |
| gpointer user_data); |
| |
| |
| GType gst_caps_get_type (void); |
| |
| GstCaps * gst_caps_new_empty (void); |
| GstCaps * gst_caps_new_any (void); |
| GstCaps * gst_caps_new_empty_simple (const char *media_type) G_GNUC_WARN_UNUSED_RESULT; |
| GstCaps * gst_caps_new_simple (const char *media_type, |
| const char *fieldname, |
| ...) G_GNUC_NULL_TERMINATED G_GNUC_WARN_UNUSED_RESULT; |
| GstCaps * gst_caps_new_full (GstStructure *struct1, |
| ...) G_GNUC_NULL_TERMINATED G_GNUC_WARN_UNUSED_RESULT; |
| GstCaps * gst_caps_new_full_valist (GstStructure *structure, |
| va_list var_args) G_GNUC_WARN_UNUSED_RESULT; |
| |
| 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_append_structure (GstCaps *caps, |
| GstStructure *structure); |
| void gst_caps_append_structure_full (GstCaps *caps, |
| GstStructure *structure, |
| GstCapsFeatures *features); |
| void gst_caps_remove_structure (GstCaps *caps, guint idx); |
| GstCaps * gst_caps_merge (GstCaps *caps1, |
| GstCaps *caps2) G_GNUC_WARN_UNUSED_RESULT; |
| GstCaps * gst_caps_merge_structure (GstCaps *caps, |
| GstStructure *structure) G_GNUC_WARN_UNUSED_RESULT; |
| GstCaps * gst_caps_merge_structure_full (GstCaps *caps, |
| GstStructure *structure, |
| GstCapsFeatures *features) G_GNUC_WARN_UNUSED_RESULT; |
| 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) G_GNUC_WARN_UNUSED_RESULT; |
| void gst_caps_set_features (GstCaps *caps, |
| guint index, |
| GstCapsFeatures * features); |
| GstCapsFeatures * gst_caps_get_features (const GstCaps *caps, |
| guint index); |
| GstCaps * gst_caps_copy_nth (const GstCaps *caps, guint nth) G_GNUC_WARN_UNUSED_RESULT; |
| GstCaps * gst_caps_truncate (GstCaps *caps) G_GNUC_WARN_UNUSED_RESULT; |
| 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); |
| |
| gboolean gst_caps_foreach (const GstCaps *caps, |
| GstCapsForeachFunc func, |
| gpointer user_data); |
| |
| gboolean gst_caps_map_in_place (GstCaps *caps, |
| GstCapsMapFunc func, |
| gpointer user_data); |
| |
| void gst_caps_filter_and_map_in_place (GstCaps *caps, |
| GstCapsFilterMapFunc func, |
| gpointer user_data); |
| |
| /* 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_subset_structure_full (const GstCaps *caps, |
| const GstStructure *structure, |
| const GstCapsFeatures *features); |
| 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); |
| gboolean gst_caps_is_strictly_equal (const GstCaps *caps1, |
| const GstCaps *caps2); |
| |
| |
| /* operations */ |
| GstCaps * gst_caps_intersect (GstCaps *caps1, |
| GstCaps *caps2) G_GNUC_WARN_UNUSED_RESULT; |
| GstCaps * gst_caps_intersect_full (GstCaps *caps1, |
| GstCaps *caps2, |
| GstCapsIntersectMode mode) G_GNUC_WARN_UNUSED_RESULT; |
| GstCaps * gst_caps_subtract (GstCaps *minuend, |
| GstCaps *subtrahend) G_GNUC_WARN_UNUSED_RESULT; |
| GstCaps * gst_caps_normalize (GstCaps *caps) G_GNUC_WARN_UNUSED_RESULT; |
| GstCaps * gst_caps_simplify (GstCaps *caps) G_GNUC_WARN_UNUSED_RESULT; |
| |
| GstCaps * gst_caps_fixate (GstCaps *caps) G_GNUC_WARN_UNUSED_RESULT; |
| |
| /* utility */ |
| gchar * gst_caps_to_string (const GstCaps *caps) G_GNUC_MALLOC; |
| 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 |
| |
| G_END_DECLS |
| |
| #endif /* __GST_CAPS_H__ */ |
