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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>GstCapsFeatures: GStreamer 1.0 Core Reference Manual</title>
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<link rel="home" href="index.html" title="GStreamer 1.0 Core Reference Manual">
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<link rel="up" href="libgstreamer.html" title="GStreamer Core Library">
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<link rel="prev" href="GstCaps.html" title="GstCaps">
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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Top |
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Description |
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Object Hierarchy
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GstCapsFeatures
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GstCapsFeatures — A set of features in caps
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Functions
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GstCapsFeatures *
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gst_caps_features_new ()
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GstCapsFeatures *
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gst_caps_features_new_empty ()
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GstCapsFeatures *
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gst_caps_features_new_any ()
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GstCapsFeatures *
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gst_caps_features_new_id ()
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GstCapsFeatures *
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gst_caps_features_new_id_valist ()
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GstCapsFeatures *
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gst_caps_features_new_valist ()
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GstCapsFeatures *
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gst_caps_features_copy ()
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void
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gst_caps_features_free ()
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GstCapsFeatures *
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gst_caps_features_from_string ()
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gchar *
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gst_caps_features_to_string ()
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gboolean
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gst_caps_features_set_parent_refcount ()
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gboolean
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gst_caps_features_is_equal ()
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gboolean
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gst_caps_features_is_any ()
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gboolean
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gst_caps_features_contains ()
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gboolean
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gst_caps_features_contains_id ()
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guint
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gst_caps_features_get_size ()
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const gchar *
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gst_caps_features_get_nth ()
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GQuark
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gst_caps_features_get_nth_id ()
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void
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gst_caps_features_add ()
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void
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gst_caps_features_add_id ()
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void
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gst_caps_features_remove ()
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void
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gst_caps_features_remove_id ()
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Types and Values
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GstCapsFeatures
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#define
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GST_CAPS_FEATURES_ANY
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#define
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GST_CAPS_FEATURES_MEMORY_SYSTEM_MEMORY
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#define
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GST_CAPS_FEATURE_MEMORY_SYSTEM_MEMORY
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Object Hierarchy
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GBoxed
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╰── GstCapsFeatures
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Includes
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#include <gst/gst.h>
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Description
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GstCapsFeatures can optionally be set on a GstCaps to add requirements
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for additional features for a specific GstStructure. Caps structures with
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the same name but with a non-equal set of caps features are not compatible.
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If a pad supports multiple sets of features it has to add multiple equal
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structures with different feature sets to the caps.
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Empty GstCapsFeatures are equivalent with the GstCapsFeatures that only
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contain GST_CAPS_FEATURE_MEMORY_SYSTEM_MEMORY. ANY GstCapsFeatures as
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created by gst_caps_features_new_any() are equal to any other GstCapsFeatures
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and can be used to specify that any GstCapsFeatures would be supported, e.g.
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for elements that don't touch buffer memory. GstCaps with ANY GstCapsFeatures
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are considered non-fixed and during negotiation some GstCapsFeatures have
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to be selected.
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Examples for caps features would be the requirement of a specific GstMemory
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types or the requirement of having a specific GstMeta on the buffer. Features
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are given as a string of the format "memory:GstMemoryTypeName" or
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"meta:GstMetaAPIName".
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Functions
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gst_caps_features_new ()
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GstCapsFeatures *
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gst_caps_features_new (const gchar *feature1 ,
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... );
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Creates a new GstCapsFeatures with the given features.
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The last argument must be NULL .
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Free-function: gst_caps_features_free
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Parameters
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feature1
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name of first feature to set
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...
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additional features
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Returns
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a new, empty GstCapsFeatures.
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[transfer full]
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Since: 1.2
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gst_caps_features_new_empty ()
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GstCapsFeatures *
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gst_caps_features_new_empty (void );
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Creates a new, empty GstCapsFeatures.
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Free-function: gst_caps_features_free
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Returns
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a new, empty GstCapsFeatures.
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[transfer full]
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Since: 1.2
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gst_caps_features_new_any ()
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GstCapsFeatures *
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gst_caps_features_new_any (void );
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Creates a new, ANY GstCapsFeatures. This will be equal
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to any other GstCapsFeatures but caps with these are
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unfixed.
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Free-function: gst_caps_features_free
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Returns
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a new, ANY GstCapsFeatures.
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[transfer full]
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Since: 1.2
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gst_caps_features_new_id ()
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GstCapsFeatures *
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gst_caps_features_new_id (GQuark feature1 ,
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... );
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Creates a new GstCapsFeatures with the given features.
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The last argument must be 0.
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Free-function: gst_caps_features_free
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Parameters
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feature1
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name of first feature to set
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963350 |
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963350 |
...
|
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963350 |
additional features
|
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Packit Service |
963350 |
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Packit Service |
963350 |
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Packit Service |
963350 |
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Packit Service |
963350 |
|
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Packit Service |
963350 |
|
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Packit Service |
963350 |
|
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Packit Service |
963350 |
Returns
|
|
Packit Service |
963350 |
a new, empty GstCapsFeatures.
|
|
Packit Service |
963350 |
[transfer full]
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
Since: 1.2
|
|
Packit Service |
963350 |
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Packit Service |
963350 |
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Packit Service |
963350 |
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Packit Service |
963350 |
gst_caps_features_new_id_valist ()
|
|
Packit Service |
963350 |
GstCapsFeatures *
|
|
Packit Service |
963350 |
gst_caps_features_new_id_valist (GQuark feature1 ,
|
|
Packit Service |
963350 |
va_list varargs );
|
|
Packit Service |
963350 |
Creates a new GstCapsFeatures with the given features.
|
|
Packit Service |
963350 |
Free-function: gst_caps_features_free
|
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Packit Service |
963350 |
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Packit Service |
963350 |
Parameters
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Packit Service |
963350 |
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Packit Service |
963350 |
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Packit Service |
963350 |
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Packit Service |
963350 |
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Packit Service |
963350 |
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963350 |
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963350 |
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963350 |
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963350 |
feature1
|
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Packit Service |
963350 |
name of first feature to set
|
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Packit Service |
963350 |
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963350 |
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Packit Service |
963350 |
|
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963350 |
varargs
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963350 |
variable argument list
|
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963350 |
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Packit Service |
963350 |
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Packit Service |
963350 |
|
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Packit Service |
963350 |
|
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Packit Service |
963350 |
|
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Packit Service |
963350 |
|
|
Packit Service |
963350 |
Returns
|
|
Packit Service |
963350 |
a new, empty GstCapsFeatures.
|
|
Packit Service |
963350 |
[transfer full]
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
Since: 1.2
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
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Packit Service |
963350 |
|
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Packit Service |
963350 |
gst_caps_features_new_valist ()
|
|
Packit Service |
963350 |
GstCapsFeatures *
|
|
Packit Service |
963350 |
gst_caps_features_new_valist (const gchar *feature1 ,
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Packit Service |
963350 |
va_list varargs );
|
|
Packit Service |
963350 |
Creates a new GstCapsFeatures with the given features.
|
|
Packit Service |
963350 |
Free-function: gst_caps_features_free
|
|
Packit Service |
963350 |
|
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Packit Service |
963350 |
Parameters
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963350 |
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Packit Service |
963350 |
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963350 |
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963350 |
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963350 |
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963350 |
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963350 |
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963350 |
|
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963350 |
feature1
|
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963350 |
name of first feature to set
|
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Packit Service |
963350 |
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Packit Service |
963350 |
|
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Packit Service |
963350 |
|
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Packit Service |
963350 |
varargs
|
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Packit Service |
963350 |
variable argument list
|
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Packit Service |
963350 |
|
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Packit Service |
963350 |
|
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Packit Service |
963350 |
|
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Packit Service |
963350 |
|
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Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
Returns
|
|
Packit Service |
963350 |
a new, empty GstCapsFeatures.
|
|
Packit Service |
963350 |
[transfer full]
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
Since: 1.2
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
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Packit Service |
963350 |
|
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Packit Service |
963350 |
gst_caps_features_copy ()
|
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Packit Service |
963350 |
GstCapsFeatures *
|
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Packit Service |
963350 |
gst_caps_features_copy (const GstCapsFeatures *features );
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Packit Service |
963350 |
Duplicates a GstCapsFeatures and all its values.
|
|
Packit Service |
963350 |
Free-function: gst_caps_features_free
|
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Packit Service |
963350 |
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Packit Service |
963350 |
Parameters
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Packit Service |
963350 |
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Packit Service |
963350 |
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Packit Service |
963350 |
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Packit Service |
963350 |
|
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Packit Service |
963350 |
|
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Packit Service |
963350 |
|
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Packit Service |
963350 |
|
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Packit Service |
963350 |
features
|
|
Packit Service |
963350 |
a GstCapsFeatures to duplicate
|
|
Packit Service |
963350 |
|
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Packit Service |
963350 |
|
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Packit Service |
963350 |
|
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Packit Service |
963350 |
|
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Packit Service |
963350 |
|
|
Packit Service |
963350 |
Returns
|
|
Packit Service |
963350 |
a new GstCapsFeatures.
|
|
Packit Service |
963350 |
[transfer full]
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
Since: 1.2
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
gst_caps_features_free ()
|
|
Packit Service |
963350 |
void
|
|
Packit Service |
963350 |
gst_caps_features_free (GstCapsFeatures *features );
|
|
Packit Service |
963350 |
Frees a GstCapsFeatures and all its values. The caps features must not
|
|
Packit Service |
963350 |
have a parent when this function is called.
|
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Packit Service |
963350 |
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Packit Service |
963350 |
Parameters
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963350 |
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Packit Service |
963350 |
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Packit Service |
963350 |
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Packit Service |
963350 |
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Packit Service |
963350 |
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Packit Service |
963350 |
|
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Packit Service |
963350 |
|
|
Packit Service |
963350 |
features
|
|
Packit Service |
963350 |
the GstCapsFeatures to free.
|
|
Packit Service |
963350 |
[in][transfer full]
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
Since: 1.2
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
gst_caps_features_from_string ()
|
|
Packit Service |
963350 |
GstCapsFeatures *
|
|
Packit Service |
963350 |
gst_caps_features_from_string (const gchar *features );
|
|
Packit Service |
963350 |
Creates a GstCapsFeatures from a string representation.
|
|
Packit Service |
963350 |
Free-function: gst_caps_features_free
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
Parameters
|
|
Packit Service |
963350 |
|
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Packit Service |
963350 |
|
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Packit Service |
963350 |
|
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Packit Service |
963350 |
|
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Packit Service |
963350 |
|
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Packit Service |
963350 |
|
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Packit Service |
963350 |
|
|
Packit Service |
963350 |
features
|
|
Packit Service |
963350 |
a string representation of a GstCapsFeatures.
|
|
Packit Service |
963350 |
|
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Packit Service |
963350 |
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Packit Service |
963350 |
|
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Packit Service |
963350 |
|
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Packit Service |
963350 |
|
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963350 |
Returns
|
|
Packit Service |
963350 |
a new GstCapsFeatures or
|
|
Packit Service |
963350 |
NULL when the string could not be parsed. Free with
|
|
Packit Service |
963350 |
gst_caps_features_free() after use.
|
|
Packit Service |
963350 |
[transfer full][nullable]
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
Since: 1.2
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
gst_caps_features_to_string ()
|
|
Packit Service |
963350 |
gchar *
|
|
Packit Service |
963350 |
gst_caps_features_to_string (const GstCapsFeatures *features );
|
|
Packit Service |
963350 |
Converts features
|
|
Packit Service |
963350 |
to a human-readable string representation.
|
|
Packit Service |
963350 |
For debugging purposes its easier to do something like this:
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
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Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
1
|
|
Packit Service |
963350 |
GST_LOG ("features is %" GST_PTR_FORMAT, features);
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
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Packit Service |
963350 |
|
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Packit Service |
963350 |
|
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Packit Service |
963350 |
|
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Packit Service |
963350 |
|
|
Packit Service |
963350 |
This prints the features in human readable form.
|
|
Packit Service |
963350 |
Free-function: g_free
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
Parameters
|
|
Packit Service |
963350 |
|
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Packit Service |
963350 |
|
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Packit Service |
963350 |
|
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Packit Service |
963350 |
|
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Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
features
|
|
Packit Service |
963350 |
a GstCapsFeatures
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
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Packit Service |
963350 |
|
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Packit Service |
963350 |
|
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Packit Service |
963350 |
|
|
Packit Service |
963350 |
Returns
|
|
Packit Service |
963350 |
a pointer to string allocated by g_malloc() .
|
|
Packit Service |
963350 |
g_free() after usage.
|
|
Packit Service |
963350 |
[transfer full]
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
Since: 1.2
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
gst_caps_features_set_parent_refcount ()
|
|
Packit Service |
963350 |
gboolean
|
|
Packit Service |
963350 |
gst_caps_features_set_parent_refcount (GstCapsFeatures *features ,
|
|
Packit Service |
963350 |
gint *refcount );
|
|
Packit Service |
963350 |
Sets the parent_refcount field of GstCapsFeatures. This field is used to
|
|
Packit Service |
963350 |
determine whether a caps features is mutable or not. This function should only be
|
|
Packit Service |
963350 |
called by code implementing parent objects of GstCapsFeatures, as described in
|
|
Packit Service |
963350 |
the MT Refcounting section of the design documents.
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
Parameters
|
|
Packit Service |
963350 |
|
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Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
features
|
|
Packit Service |
963350 |
a GstCapsFeatures
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
refcount
|
|
Packit Service |
963350 |
a pointer to the parent's refcount.
|
|
Packit Service |
963350 |
[in]
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
Returns
|
|
Packit Service |
963350 |
TRUE if the parent refcount could be set.
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
Since: 1.2
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
gst_caps_features_is_equal ()
|
|
Packit Service |
963350 |
gboolean
|
|
Packit Service |
963350 |
gst_caps_features_is_equal (const GstCapsFeatures *features1 ,
|
|
Packit Service |
963350 |
const GstCapsFeatures *features2 );
|
|
Packit Service |
963350 |
Check if features1
|
|
Packit Service |
963350 |
and features2
|
|
Packit Service |
963350 |
are equal.
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
Parameters
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
features1
|
|
Packit Service |
963350 |
a GstCapsFeatures.
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
features2
|
|
Packit Service |
963350 |
a GstCapsFeatures.
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
Returns
|
|
Packit Service |
963350 |
TRUE if features1
|
|
Packit Service |
963350 |
and features2
|
|
Packit Service |
963350 |
are equal.
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
Since: 1.2
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
gst_caps_features_is_any ()
|
|
Packit Service |
963350 |
gboolean
|
|
Packit Service |
963350 |
gst_caps_features_is_any (const GstCapsFeatures *features );
|
|
Packit Service |
963350 |
Check if features
|
|
Packit Service |
963350 |
is GST_CAPS_FEATURES_ANY .
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
Parameters
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
features
|
|
Packit Service |
963350 |
a GstCapsFeatures.
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
Returns
|
|
Packit Service |
963350 |
TRUE if features
|
|
Packit Service |
963350 |
is GST_CAPS_FEATURES_ANY .
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
Since: 1.2
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
gst_caps_features_contains ()
|
|
Packit Service |
963350 |
gboolean
|
|
Packit Service |
963350 |
gst_caps_features_contains (const GstCapsFeatures *features ,
|
|
Packit Service |
963350 |
const gchar *feature );
|
|
Packit Service |
963350 |
Check if features
|
|
Packit Service |
963350 |
contains feature
|
|
Packit Service |
963350 |
.
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
Parameters
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
features
|
|
Packit Service |
963350 |
a GstCapsFeatures.
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
feature
|
|
Packit Service |
963350 |
a feature
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
Returns
|
|
Packit Service |
963350 |
TRUE if features
|
|
Packit Service |
963350 |
contains feature
|
|
Packit Service |
963350 |
.
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
Since: 1.2
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
gst_caps_features_contains_id ()
|
|
Packit Service |
963350 |
gboolean
|
|
Packit Service |
963350 |
gst_caps_features_contains_id (const GstCapsFeatures *features ,
|
|
Packit Service |
963350 |
GQuark feature );
|
|
Packit Service |
963350 |
Check if features
|
|
Packit Service |
963350 |
contains feature
|
|
Packit Service |
963350 |
.
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
Parameters
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
|
|
Packit Service |
963350 |
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features
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a GstCapsFeatures.
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feature
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a feature
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Returns
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TRUE if features
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contains feature
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.
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Since: 1.2
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gst_caps_features_get_size ()
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guint
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gst_caps_features_get_size (const GstCapsFeatures *features );
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Returns the number of features in features
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.
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Parameters
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features
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a GstCapsFeatures.
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Returns
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The number of features in features
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.
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Since: 1.2
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gst_caps_features_get_nth ()
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const gchar *
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gst_caps_features_get_nth (const GstCapsFeatures *features ,
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guint i );
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Returns the i
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-th feature of features
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.
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Parameters
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features
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a GstCapsFeatures.
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i
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index of the feature
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Returns
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The i
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-th feature of features
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.
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[nullable]
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Since: 1.2
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gst_caps_features_get_nth_id ()
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GQuark
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gst_caps_features_get_nth_id (const GstCapsFeatures *features ,
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guint i );
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Returns the i
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-th feature of features
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.
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Parameters
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features
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a GstCapsFeatures.
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i
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index of the feature
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Returns
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The i
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.
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Since: 1.2
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gst_caps_features_add ()
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void
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gst_caps_features_add (GstCapsFeatures *features ,
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const gchar *feature );
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Adds feature
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to features
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Parameters
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features
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a GstCapsFeatures.
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feature
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a feature.
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gst_caps_features_add_id ()
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void
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gst_caps_features_add_id (GstCapsFeatures *features ,
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GQuark feature );
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Adds feature
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to features
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Parameters
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features
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a GstCapsFeatures.
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feature
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a feature.
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Since: 1.2
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gst_caps_features_remove ()
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void
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gst_caps_features_remove (GstCapsFeatures *features ,
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const gchar *feature );
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Removes feature
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from features
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Parameters
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features
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a GstCapsFeatures.
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feature
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a feature.
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gst_caps_features_remove_id ()
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void
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gst_caps_features_remove_id (GstCapsFeatures *features ,
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GQuark feature );
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Removes feature
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from features
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.
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Parameters
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features
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a GstCapsFeatures.
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feature
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a feature.
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Since: 1.2
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Types and Values
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GstCapsFeatures
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typedef struct _GstCapsFeatures GstCapsFeatures;
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GST_CAPS_FEATURES_ANY
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#define GST_CAPS_FEATURES_ANY (_gst_caps_features_any)
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GST_CAPS_FEATURES_MEMORY_SYSTEM_MEMORY
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#define GST_CAPS_FEATURES_MEMORY_SYSTEM_MEMORY (_gst_caps_features_memory_system_memory)
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GST_CAPS_FEATURE_MEMORY_SYSTEM_MEMORY
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#define GST_CAPS_FEATURE_MEMORY_SYSTEM_MEMORY "memory:SystemMemory"
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See Also
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GstCaps
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Generated by GTK-Doc V1.27
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</body>
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