typedef struct {
hi_u32 b_frame_num; // RW; Range:[1, 3]; Number of B frames
hi_s32 b_qp_delta; // RW; Range:[-10, 30]; QP variance between P frame and B frame
hi_s32 ip_qp_delta; // RW; Range:[-10, 30]; QP variance between P frame and I frame
} hi_venc_gop_bipred_b;