20     pub capabilities: Option<f64>,   // double default: 15
21     pub audio_codecs: Option<f64>,   // double default: 4071
22     pub video_codecs: Option<f64>,   // double default: 252
23     pub video_function: Option<f64>, // double default: 1
24     pub object_encoding: Option<f64>,
95         transaction_id: &f64,  in write_connect_with_value()  argument
107         transaction_id: &f64,  in write_connect()  argument
187         transaction_id: &f64,  in write_connect_response()  argument
189         capabilities: &f64,  in write_connect_response()  argument
193         encoding: &f64,  in write_connect_response()  argument
237         transaction_id: &f64,  in write_create_stream()  argument
249         transaction_id: &f64,  in write_create_stream_response()  argument
250         stream_id: &f64,  in write_create_stream_response()  argument
262         transaction_id: &f64,  in write_get_stream_length()  argument
276         transaction_id: &f64,  in error()  argument