static double get_diff_limited_q(MpegEncContext *s, RateControlEntry *rce, double q){ RateControlContext *rcc= &s->rc_context; AVCodecContext *a= s->avctx; const int pict_type= rce->new_pict_type; const double last_p_q = rcc->last_qscale_for[P_TYPE]; const double last_non_b_q= rcc->last_qscale_for[rcc->last_non_b_pict_type]; if (pict_type==I_TYPE && (a->i_quant_factor>0.0 || rcc->last_non_b_pict_type==P_TYPE)) q= last_p_q *FFABS(a->i_quant_factor) + a->i_quant_offset; else if(pict_type==B_TYPE && a->b_quant_factor>0.0) q= last_non_b_q* a->b_quant_factor + a->b_quant_offset; /* last qscale / qdiff stuff */ if(rcc->last_non_b_pict_type==pict_type || pict_type!=I_TYPE){ double last_q= rcc->last_qscale_for[pict_type]; const int maxdiff= FF_QP2LAMBDA * a->max_qdiff; if (q > last_q + maxdiff) q= last_q + maxdiff; else if(q < last_q - maxdiff) q= last_q - maxdiff; } rcc->last_qscale_for[pict_type]= q; //Note we cannot do that after blurring if(pict_type!=B_TYPE) rcc->last_non_b_pict_type= pict_type; return q; }