x265中checkMerge2Nx2N_rd0_4()分析(版本2.8)

一.函数调用关系图：

二. 源码分析注释：

/*============Analysed by: yangxin============Date:        2018.10============Function:    checkMerge2Nx2N_rd0_4()      merge预测技术============Note:        merge预测技术只针对2Nx2N,这种模式下当前CU在只有一个pu,也只有一个tu
*/
/* sets md.bestMode if a valid merge candidate is found, else leaves it NULL */
void Analysis::checkMerge2Nx2N_rd0_4(Mode& skip, Mode& merge, const CUGeom& cuGeom)
{uint32_t depth = cuGeom.depth;ModeDepth& md = m_modeDepth[depth];Yuv *fencYuv = &md.fencYuv;/* Note that these two Mode instances are named MERGE and SKIP but they may* hold the reverse when the function returns. We toggle between the two modes */Mode* tempPred = &merge;Mode* bestPred = &skip;X265_CHECK(m_slice->m_sliceType != I_SLICE, "Evaluating merge in I slice\n");tempPred->initCosts();tempPred->cu.setPartSizeSubParts(SIZE_2Nx2N);tempPred->cu.setPredModeSubParts(MODE_INTER);tempPred->cu.m_mergeFlag[0] = true;bestPred->initCosts();bestPred->cu.setPartSizeSubParts(SIZE_2Nx2N);bestPred->cu.setPredModeSubParts(MODE_INTER);bestPred->cu.m_mergeFlag[0] = true;MVField candMvField[MRG_MAX_NUM_CANDS][2]; // double length for mv of both listsuint8_t candDir[MRG_MAX_NUM_CANDS];uint32_t numMergeCand = tempPred->cu.getInterMergeCandidates(0, 0, candMvField, candDir);//--得到merge候选列表PredictionUnit pu(merge.cu, cuGeom, 0);bestPred->sa8dCost = MAX_INT64;int bestSadCand = -1;int sizeIdx = cuGeom.log2CUSize - 2;int safeX, maxSafeMv;if (m_param->bIntraRefresh && m_slice->m_sliceType == P_SLICE){safeX = m_slice->m_refFrameList[0][0]->m_encData->m_pir.pirEndCol * m_param->maxCUSize - 3;maxSafeMv = (safeX - tempPred->cu.m_cuPelX) * 4;}//--遍历所有merge候选，选择最小的sa8dCost作为最优mv进行下一步的RDO--------------------------------------------------------/for (uint32_t i = 0; i < numMergeCand; ++i){if (m_bFrameParallel){// Parallel slices bound checkif (m_param->maxSlices > 1){// NOTE: First row in slice can't negativeif (X265_MIN(candMvField[i][0].mv.y, candMvField[i][1].mv.y) < m_sliceMinY)continue;// Last row in slice can't reference beyond bound since it is another slice area// TODO: we may beyond bound in future since these area have a chance to finish because we use parallel slices. Necessary prepare research on load balanceif (X265_MAX(candMvField[i][0].mv.y, candMvField[i][1].mv.y) > m_sliceMaxY)continue;}if (candMvField[i][0].mv.y >= (m_param->searchRange + 1) * 4 ||candMvField[i][1].mv.y >= (m_param->searchRange + 1) * 4)continue;}if (m_param->bIntraRefresh && m_slice->m_sliceType == P_SLICE &&tempPred->cu.m_cuPelX / m_param->maxCUSize < m_frame->m_encData->m_pir.pirEndCol &&candMvField[i][0].mv.x > maxSafeMv)// skip merge candidates which reference beyond safe reference areacontinue;tempPred->cu.m_mvpIdx[0][0] = (uint8_t)i; // merge candidate ID is stored in L0 MVP idxX265_CHECK(m_slice->m_sliceType == B_SLICE || !(candDir[i] & 0x10), " invalid merge for P slice\n");tempPred->cu.m_interDir[0] = candDir[i];tempPred->cu.m_mv[0][0] = candMvField[i][0].mv;tempPred->cu.m_mv[1][0] = candMvField[i][1].mv;tempPred->cu.m_refIdx[0][0] = (int8_t)candMvField[i][0].refIdx;tempPred->cu.m_refIdx[1][0] = (int8_t)candMvField[i][1].refIdx;//--运动补偿motionCompensation(tempPred->cu, pu, tempPred->predYuv, true, m_bChromaSa8d && (m_csp != X265_CSP_I400 && m_frame->m_fencPic->m_picCsp != X265_CSP_I400));//--bit计算tempPred->sa8dBits = getTUBits(i, numMergeCand);//--失真计算tempPred->distortion = primitives.cu[sizeIdx].sa8d(fencYuv->m_buf[0], fencYuv->m_size, tempPred->predYuv.m_buf[0], tempPred->predYuv.m_size);if (m_bChromaSa8d && (m_csp != X265_CSP_I400 && m_frame->m_fencPic->m_picCsp != X265_CSP_I400)){tempPred->distortion += primitives.chroma[m_csp].cu[sizeIdx].sa8d(fencYuv->m_buf[1], fencYuv->m_csize, tempPred->predYuv.m_buf[1], tempPred->predYuv.m_csize);tempPred->distortion += primitives.chroma[m_csp].cu[sizeIdx].sa8d(fencYuv->m_buf[2], fencYuv->m_csize, tempPred->predYuv.m_buf[2], tempPred->predYuv.m_csize);}//--代价计算tempPred->sa8dCost = m_rdCost.calcRdSADCost((uint32_t)tempPred->distortion, tempPred->sa8dBits);if (tempPred->sa8dCost < bestPred->sa8dCost){bestSadCand = i;std::swap(tempPred, bestPred);//--交换左右值}}///---------------------------------------------------------------------------------------------------///* force mode decision to take inter or intra */if (bestSadCand < 0)return;/* calculate the motion compensation for chroma for the best mode selected */ //--为选择的最优模式进行色度的运动补偿评估*****if ((!m_bChromaSa8d && (m_csp != X265_CSP_I400)) || (m_frame->m_fencPic->m_picCsp == X265_CSP_I400 && m_csp != X265_CSP_I400)) /* Chroma MC was done above */motionCompensation(bestPred->cu, pu, bestPred->predYuv, false, true);/-------------------------------RDO的计算---------------------------------------------------//if (m_param->rdLevel)//--开启rate distortion optimizations{if (m_param->bLossless)bestPred->rdCost = MAX_INT64;elseencodeResAndCalcRdSkipCU(*bestPred); //--skip==encode residual and compute rd-cost for inter mode，会覆盖帧间模式的RDcost变量，但是sa8d cost没有被破坏/* Encode with residual */tempPred->cu.m_mvpIdx[0][0] = (uint8_t)bestSadCand;tempPred->cu.setPUInterDir(candDir[bestSadCand], 0, 0);tempPred->cu.setPUMv(0, candMvField[bestSadCand][0].mv, 0, 0);tempPred->cu.setPUMv(1, candMvField[bestSadCand][1].mv, 0, 0);tempPred->cu.setPURefIdx(0, (int8_t)candMvField[bestSadCand][0].refIdx, 0, 0);tempPred->cu.setPURefIdx(1, (int8_t)candMvField[bestSadCand][1].refIdx, 0, 0);tempPred->sa8dCost = bestPred->sa8dCost;tempPred->sa8dBits = bestPred->sa8dBits;tempPred->predYuv.copyFromYuv(bestPred->predYuv);encodeResAndCalcRdInterCU(*tempPred, cuGeom);//--merge==encode residual and compute rd-cost for inter modemd.bestMode = tempPred->rdCost < bestPred->rdCost ? tempPred : bestPred;}elsemd.bestMode = bestPred;//--不使用RDO/* broadcast sets of MV field data */md.bestMode->cu.setPUInterDir(candDir[bestSadCand], 0, 0);md.bestMode->cu.setPUMv(0, candMvField[bestSadCand][0].mv, 0, 0);md.bestMode->cu.setPUMv(1, candMvField[bestSadCand][1].mv, 0, 0);md.bestMode->cu.setPURefIdx(0, (int8_t)candMvField[bestSadCand][0].refIdx, 0, 0);md.bestMode->cu.setPURefIdx(1, (int8_t)candMvField[bestSadCand][1].refIdx, 0, 0);checkDQP(*md.bestMode, cuGeom);
}

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x265中checkMerge2Nx2N_rd0_4()分析(版本2.8)

一.函数调用关系图：

二. 源码分析注释：

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