xavs2 RDO

Compress_CU

标签（空格分隔）： 未分类

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• compress_ctu_intra(rdo.c)
  
  • 自顶向下深度优先划分cu结构
  • Out : (rdcost_t)当前ctu最优编码代价？
  • init current CU: compress_cu_intra
  • coding current CU
  • Coding Sub-CUs and decide to split or not to

• compress_cu_intra(rdo.c)
  
  • 划分模式：2Nx2N、NxN、2Nxn、nx2N
  • p_cu->cu_info.i_mode(set cu type)

• cu_check_intra(rdo.c)

  • 当前mode计算率失真代价？
  • decide PU mode?: cu_init_pu_intra
  • num_luma_block 亮度块数量(4 or 1)
  • xavs2_get_mpms(mpm): get most probable modes to mpm???
  • for(int i = 0; i < num_for_rdo; i++){rdcost}
  • cu_recon_intra_luma

  
  

• cu_init_pu_intra(rdo.c)

  • 依据CU划分模式确定当前CU包含的PU数量和大小
  • p_cu->p_ctu_info.cb(PU的x,y,w,h)（起始位置和宽度高度）
  • 确定TU划分类型？？？

• xavs2_get_mpms(rdo.c)

  • Most Probable modes
  • switch(blockidx?): get coding modes of left and top blocks
  • mpm[0] mpm[1] (relations to top_mode and left_mode)

  
  

• get_intra_dir_for_rdo_luma(rdo.c)

  • p_candidates(candidate list, reserving the cost)
  • FENC_STRIDE (MAX_CU_SIZE) (stride for LCU enc buffer, Y component)
  • p_fenc(Current frame to be encoded)
  • return (int) num_for_rdo???
  • 在compress_cu_intra 中函数指针 指向->get_intra_candidates_luma, 指向->rdo_get_pred_intra_luma, return numbers for RDO and candidate list by scanning all the intra modes

• rdo_get_pred_intra_luma(md_intra.c)

  • return numbers for RDO and candidate list by scanning all the intra mode
  • fill_ref_samples_luma /* get edge samples for intra prediction */
  • Loop over all intra prediction modes->PREDICT_ADD_LUMA(mode)
  • return tab_num_intra_rdo(different rdo numbers according to different preset)

  
  

• PREDICT_ADD_LUMA(md_intra.c)

  • mode_bits = (mpm[0] == (MODE_IDX) || mpm[1] == (MODE_IDX)) ? 2 : 6
  • cost = lamda * mode_bits
  • xavs2_intra_prediction
  • cost += intra_cmp(either satd or sad for intra mode )
  • update_candidate_list(find a position for current mode, from smallest to biggest)

• xavs2_intra_prediction(md_intra.c)
  
  • xavs2_intra_pred_init
  • do the prediction

• xavs2_intra_pred_init(intra.c)
  
  • Init .intraf[] to specific function

• cu_recon_intra_luma(rdo.c)

  • finish transform quantization inverse-transform, inverse-quantization and reconstruction pixel generation of a intra luma block
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