Get the body of msg. data remains valid for as long as msg is valid and
unchanged.
If the message body was set as a #GstBuffer before this will cause the data
to be copied and stored in the message. The #GstBuffer will no longer be
kept in the message.
Get the body of msg. data remains valid for as long as msg is valid and unchanged.
If the message body was set as a #GstBuffer before this will cause the data to be copied and stored in the message. The #GstBuffer will no longer be kept in the message.