gst.meta

Module for [Meta] class

class Meta

Types 1

classMeta

The #GstMeta structure should be included as the first member of a #GstBuffer metadata structure. The structure defines the API of the metadata and should be accessible to all elements using the metadata.

A metadata API is registered with [gst.meta.Meta.apiTypeRegister] which takes a name for the metadata API and some tags associated with the metadata. With [gst.meta.Meta.apiTypeHasTag] one can check if a certain metadata API contains a given tag.

Multiple implementations of a metadata API can be registered. To implement a metadata API, [gst.meta.Meta.register] should be used. This function takes all parameters needed to create, free and transform metadata along with the size of the metadata. The function returns a #GstMetaInfo structure that contains the information for the implementation of the API.

A specific implementation can be retrieved by name with [gst.meta.Meta.getInfo].

See #GstBuffer for how the metadata can be added, retrieved and removed from buffers.

Fields

GstMeta _cInstance

Methods

void * _cPtr()

gst.types.MetaFlags flags() @propertyGet `flags` field. Returns: extra flags for the metadata

void flags(gst.types.MetaFlags propval) @propertySet `flags` field. Params: propval = extra flags for the metadata

gst.meta_info.MetaInfo info() @propertyGet `info` field. Returns: pointer to the #GstMetaInfo

int compareSeqnum(gst.meta.Meta meta2)Meta sequence number compare function. Can be used as #GCompareFunc or a #GCompareDataFunc.

ulong getSeqnum()Gets seqnum for this meta. Returns:

bool serializeSimple(ubyte[] data)Same as [gst.meta.Meta.serialize] but with a #GByteArray instead of #GstByteArrayInterface.

string[] apiTypeGetTags(gobject.types.GType api)

bool apiTypeHasTag(gobject.types.GType api, glib.types.Quark tag)Check if api was registered with tag.

gobject.types.GType apiTypeRegister(string api, string[] tags)Register and return a GType for the api and associate it with tags.

gst.meta.Meta deserialize(gst.buffer.Buffer buffer, ubyte[] data, out uint consumed)Recreate a #GstMeta from serialized data returned by [gst.meta.Meta.serialize] and add it to buffer.

gst.meta_info.MetaInfo getInfo(string impl)Lookup a previously registered meta info structure by its implementation name impl.

gst.meta_info.MetaInfo registerCustom(string name,  string[]  tags,  gst.types.CustomMetaTransformFunction transformFunc =  null)

gst.meta_info.MetaInfo registerCustomSimple(string name)Simplified version of [gst.meta.Meta.registerCustom], with no tags and no transform function.

Constructors

this(void * ptr, Flag!"Take" take)