Function ParseIntra16x16Mode

codec/decoder/core/src/decode_slice.cpp:610–644

}

int32_t ParseIntra16x16Mode (PWelsDecoderContext pCtx, PWelsNeighAvail pNeighAvail, PBitStringAux pBs,
                             PDqLayer pCurDqLayer) {
  int32_t iMbXy = pCurDqLayer->iMbXyIndex;
  uint8_t uiNeighAvail = 0; //0x07 = 0 1 1 1, means left, top-left, top avail or not. (1: avail, 0: unavail)
  uint32_t uiCode;
  int32_t iCode;
  pCtx->pMap16x16NeighToSampleFunc (pNeighAvail, &uiNeighAvail);

  if (CheckIntra16x16PredMode (uiNeighAvail,
                               &pCurDqLayer->pIntraPredMode[iMbXy][7])) { //invalid iPredMode, must stop decoding
    return GENERATE_ERROR_NO (ERR_LEVEL_MB_DATA, ERR_INFO_INVALID_I16x16_PRED_MODE);
  }
  if (pCtx->pSps->uiChromaFormatIdc == 0)
    return ERR_NONE;

  if (pCurDqLayer->sLayerInfo.pPps->bEntropyCodingModeFlag) {
    WELS_READ_VERIFY (ParseIntraPredModeChromaCabac (pCtx, uiNeighAvail, iCode));
    if (iCode > MAX_PRED_MODE_ID_CHROMA) {
      return GENERATE_ERROR_NO (ERR_LEVEL_MB_DATA, ERR_INFO_INVALID_I_CHROMA_PRED_MODE);
    }
    pCurDqLayer->pChromaPredMode[iMbXy] = iCode;
  } else {
    WELS_READ_VERIFY (BsGetUe (pBs, &uiCode)); //intra_chroma_pred_mode
    if (uiCode > MAX_PRED_MODE_ID_CHROMA) {
      return GENERATE_ERROR_NO (ERR_LEVEL_MB_DATA, ERR_INFO_INVALID_I_CHROMA_PRED_MODE);
    }
    pCurDqLayer->pChromaPredMode[iMbXy] = uiCode;
  }
  if (-1 == pCurDqLayer->pChromaPredMode[iMbXy]
      || CheckIntraChromaPredMode (uiNeighAvail, &pCurDqLayer->pChromaPredMode[iMbXy])) {
    return GENERATE_ERROR_NO (ERR_LEVEL_MB_DATA, ERR_INFO_INVALID_I_CHROMA_PRED_MODE);
  }

  return ERR_NONE;
}

int32_t WelsDecodeMbCabacISliceBaseMode0 (PWelsDecoderContext pCtx, uint32_t& uiEosFlag) {
  PDqLayer pCurDqLayer             = pCtx->pCurDqLayer;