static int decode_mb_i(AVSContext *h, int cbp_code) { GetBitContext *gb = &h->s.gb; int block, pred_mode_uv; uint8_t top[18]; uint8_t *left = NULL; uint8_t *d; ff_cavs_init_mb(h); /* get intra prediction modes from stream */ for(block=0;block<4;block++) { int nA,nB,predpred; int pos = ff_cavs_scan3x3[block]; nA = h->pred_mode_Y[pos-1]; nB = h->pred_mode_Y[pos-3]; predpred = FFMIN(nA,nB); if(predpred == NOT_AVAIL) // if either is not available predpred = INTRA_L_LP; if(!get_bits1(gb)){ int rem_mode= get_bits(gb, 2); predpred = rem_mode + (rem_mode >= predpred); } h->pred_mode_Y[pos] = predpred; } pred_mode_uv = get_ue_golomb(gb); if(pred_mode_uv > 6) { av_log(h->s.avctx, AV_LOG_ERROR, "illegal intra chroma pred mode\n"); return -1; } ff_cavs_modify_mb_i(h, &pred_mode_uv); /* get coded block pattern */ if(h->pic_type == AV_PICTURE_TYPE_I) cbp_code = get_ue_golomb(gb); if(cbp_code > 63){ av_log(h->s.avctx, AV_LOG_ERROR, "illegal intra cbp\n"); return -1; } h->cbp = cbp_tab[cbp_code][0]; if(h->cbp && !h->qp_fixed) h->qp = (h->qp + get_se_golomb(gb)) & 63; //qp_delta /* luma intra prediction interleaved with residual decode/transform/add */ for(block=0;block<4;block++) { d = h->cy + h->luma_scan[block]; ff_cavs_load_intra_pred_luma(h, top, &left, block); h->intra_pred_l[h->pred_mode_Y[ff_cavs_scan3x3[block]]] (d, top, left, h->l_stride); if(h->cbp & (1<<block)) decode_residual_block(h,gb,ff_cavs_intra_dec,1,h->qp,d,h->l_stride); } /* chroma intra prediction */ ff_cavs_load_intra_pred_chroma(h); h->intra_pred_c[pred_mode_uv](h->cu, &h->top_border_u[h->mbx*10], h->left_border_u, h->c_stride); h->intra_pred_c[pred_mode_uv](h->cv, &h->top_border_v[h->mbx*10], h->left_border_v, h->c_stride); decode_residual_chroma(h); ff_cavs_filter(h,I_8X8); set_mv_intra(h); return 0; }