Passing my own metadata

[Dimitrios Katsaros]

The idea around tags is to limit metadata to elements that are relevant to
that metadata type. Classes usually have a transform_meta function that
checks the tags of the received metadata and checks if it contains the
expected tags for the given metadata type. If the metadata does not contain
the target tags it is usually dropped. In the case of GstVideoFilter the
transform metadata function checks if the metadata contains only the tag
"video". If not found, it then defaults to the Base transform_meta function
which expects the metadata tags to be empty. So in your case, you could
either leave the tags empty or set it to "video".



On Tue, Jul 21, 2015 at 1:52 PM, Deven <deven.joseph at arcure.net> wrote:

> Hello again,
>
> Problem solved :
>
> On my function, mymeta_api_get_type(), when I call
> gst_meta_api_type_register, I put some "dummy"
> tags into the second argument.
> But when I do that, videocrop doesn't call my transform function.
> When I put only NULL argument, it works :
>
> /GType
> mymeta_meta_api_get_type (void)
> {
>   static volatile GType type;
>   static const gchar *tags[] = {NULL}; /* It doesn't work with {"MyMeta",
> "test", NULL}; */
>   if (g_once_init_enter (&type)) {
>     GType _type = gst_meta_api_type_register ("MyMetaAPI", tags);
>     g_once_init_leave (&type, _type);
>   }
>   return type;
> }/
>
> Last optionnal question : What is the purpose of tags ?
> Thank you for your previous answers !
>
>
>
> --
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> http://gstreamer-devel.966125.n4.nabble.com/Passing-my-own-metadata-tp4672595p4672773.html
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