Function ConstructAccessUnit

codec/decoder/core/src/decoder_core.cpp:2352–2376

* ConstructAccessUnit * construct an access unit for given input bitstream, maybe partial NAL Unit, one or more Units are involved to * joint a collective access unit. * parameter\ * buf: bitstream data buffer * bit_len: size in bit length of data * buf_len: size in byte length of data * coded_au: mark an Access Unit decoding finished * return: * 0 - success; otherwise

 *  0 - success; otherwise returned error_no defined in error_no.h
 */
int32_t ConstructAccessUnit (PWelsDecoderContext pCtx, uint8_t** ppDst, SBufferInfo* pDstInfo) {
  int32_t iErr = ERR_NONE;
  if (GetThreadCount (pCtx) <= 1) {
    iErr = InitConstructAccessUnit (pCtx, pDstInfo);
    if (ERR_NONE != iErr) {
      return iErr;
    }
  }
  if (pCtx->pCabacDecEngine == NULL) {
    pCtx->pCabacDecEngine = (SWelsCabacDecEngine*)pCtx->pMemAlign->WelsMallocz (sizeof (SWelsCabacDecEngine),
                            "pCtx->pCabacDecEngine");
    WELS_VERIFY_RETURN_IF (ERR_INFO_OUT_OF_MEMORY, (NULL == pCtx->pCabacDecEngine))
  }

  iErr = DecodeCurrentAccessUnit (pCtx, ppDst, pDstInfo);

  WelsDecodeAccessUnitEnd (pCtx);

  if (ERR_NONE != iErr) {
    WelsLog (& (pCtx->sLogCtx), WELS_LOG_DEBUG, "returned error from decoding:[0x%x]", iErr);
    return iErr;
  }

  return ERR_NONE;
}

static inline void InitDqLayerInfo (PDqLayer pDqLayer, PLayerInfo pLayerInfo, PNalUnit pNalUnit, PPicture pPicDec) {
  PNalUnitHeaderExt pNalHdrExt    = &pNalUnit->sNalHeaderExt;