gst_buffer_add_meta question

[Nicolas Dufresne]

Le mardi 27 avril 2021 à 10:46 -0500, eyalhir74 via gstreamer-devel a écrit :
> Hi,
>   I have a question about attaching metadata to buffers in one .so file and
> reading it in another one.
>   As far as I understand when I want to attach a meta data to a buffer (in
> MyFirst.so file), I'll use the
>      gst_buffer_add_meta(buffer, gst_meta_MY_IMPL_get_info(), ) function,
> which looks like this:
> 
>      const GstMetaInfo *gst_meta_MY_IMPL_get_info() 
>      {
>         static const GstMetaInfo *m = NULL;
>         if (g_once_init_enter((GstMetaInfo **)m)
>         {
>              gst_meta_register(.......);
>              g_once_init_leave(....);
>         }
>       
> 
> 
> 
>      Does the fact that the "m" variable is static in MyFirst.so prevents me
> to read its value
> using gst_buffer_get_meta in MySecond.so? Currently I get garbage values
> when I read it in MySecond.so code.

You will need a to share a library between all plugins using the meta in order
to use this. In 1.120, there will be a CustomMeta that can be used for single
producer and that in that case won't require a shared library.

> 
> 
> thanks
> Eyal
> 
> 
> 
> --
> Sent from: http://gstreamer-devel.966125.n4.nabble.com/
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