MPEG2 Extension and User Data

extension_and_user_data(i) {

while ((nextbits() == extension_start_code) ||

(nextbits() == user_data_start_code)) {

if ( nextbits() == extension_start_code)

if ( nextbits() == user_data_start_code)

}
}

ISO/IEC 13818-2, GENERIC CODING OF MOVING PICTURES AND ASSOCIATED AUDIO INFORMATION: VIDEO, 9 November 1994