fields	type	Required	description
streamId	string	+	Audio stream id
request	object	+
request.format	enum	–	Audio stream format. Possible values: hv, fc. Default: hv
request.*			Depends on request.format
user_data	any	–	Any data which will be passed to stream event handlers. Can be of any valid type: string, number, boolean, array, object. If user_data is nil, the value will not be set.