coeff_sign_flag_decode 1402 libavcodec/hevc_cabac.c                 coeff_sign_flag = coeff_sign_flag_decode(s, nb_significant_coeff_flag) << (16 - nb_significant_coeff_flag);
coeff_sign_flag_decode 1404 libavcodec/hevc_cabac.c                 coeff_sign_flag = coeff_sign_flag_decode(s, nb_significant_coeff_flag - 1) << (16 - (nb_significant_coeff_flag - 1));