extern void vp8_cal_low_res_mb_cols(VP8_COMP *cpi);
extern void vp8_cal_dissimilarity(VP8_COMP *cpi);
extern void vp8_store_drop_frame_info(VP8_COMP *cpi);
extern void vp8_cal_low_res_mb_cols(VP8_COMP *cpi);
extern void vp8_cal_dissimilarity(VP8_COMP *cpi);
extern void vp8_store_drop_frame_info(VP8_COMP *cpi);