DECODING_STATE CWelsDecoder::DecodeFrame2 (const unsigned char* kpSrc,
const int kiSrcLen,
void** ppDst,
SBufferInfo* pDstInfo) {
if (kiSrcLen > MAX_ACCESS_UNIT_CAPACITY - MAX_MACROBLOCK_CAPACITY) {//prevent from residual reading overflow
m_pDecContext->iErrorCode |= dsOutOfMemory;
IWelsTrace::WelsVTrace (m_pTrace, IWelsTrace::WELS_LOG_INFO,
"max AU size exceeded. Allowed size = %d, current size = %d",
MAX_ACCESS_UNIT_CAPACITY, kiSrcLen);
return dsOutOfMemory;
}
if (kiSrcLen > 0 && kpSrc != NULL) {
#ifdef OUTPUT_BIT_STREAM
if (m_pFBS) {
WelsFwrite (kpSrc, sizeof (unsigned char), kiSrcLen, m_pFBS);
WelsFflush (m_pFBS);
}
if (m_pFBSSize) {
WelsFwrite (&kiSrcLen, sizeof (int), 1, m_pFBSSize);
WelsFflush (m_pFBSSize);
}
#endif//OUTPUT_BIT_STREAM
m_pDecContext->bEndOfStreamFlag = false;
} else {
//For application MODE, the error detection should be added for safe.
//But for CONSOLE MODE, when decoding LAST AU, kiSrcLen==0 && kpSrc==NULL.
m_pDecContext->bEndOfStreamFlag = true;
}
ppDst[0] = ppDst[1] = ppDst[2] = NULL;
m_pDecContext->iErrorCode = dsErrorFree; //initialize at the starting of AU decoding.
m_pDecContext->iFeedbackVclNalInAu = FEEDBACK_UNKNOWN_NAL; //initialize
memset (pDstInfo, 0, sizeof (SBufferInfo));
#ifdef LONG_TERM_REF
m_pDecContext->bReferenceLostAtT0Flag = false; //initialize for LTR
m_pDecContext->bCurAuContainLtrMarkSeFlag = false;
m_pDecContext->iFrameNumOfAuMarkedLtr = 0;
m_pDecContext->iFrameNum = -1; //initialize
#endif
m_pDecContext->iFeedbackTidInAu = -1; //initialize
WelsDecodeBs (m_pDecContext, kpSrc, kiSrcLen, (unsigned char**)ppDst,
pDstInfo); //iErrorCode has been modified in this function
if (m_pDecContext->iErrorCode) {
ENalUnitType eNalType =
NAL_UNIT_UNSPEC_0; //for NBR, IDR frames are expected to decode as followed if error decoding an IDR currently
eNalType = m_pDecContext->sCurNalHead.eNalUnitType;
//for AVC bitstream (excluding AVC with temporal scalability, including TP), as long as error occur, SHOULD notify upper layer key frame loss.
if ((IS_PARAM_SETS_NALS (eNalType) || NAL_UNIT_CODED_SLICE_IDR == eNalType) ||
(VIDEO_BITSTREAM_AVC == m_pDecContext->eVideoType)) {
#ifdef LONG_TERM_REF
m_pDecContext->bParamSetsLostFlag = true;
#else
m_pDecContext->bReferenceLostAtT0Flag = true;
#endif
ResetParameterSetsState (m_pDecContext); //initial SPS&PPS ready flag
}
IWelsTrace::WelsVTrace (m_pTrace, IWelsTrace::WELS_LOG_INFO, "decode failed, failure type:%d \n",
m_pDecContext->iErrorCode);
return (DECODING_STATE)m_pDecContext->iErrorCode;
}
return dsErrorFree;
}
/*!
*************************************************************************************
* \brief First entrance to decoding core interface.
*
* \param pCtx decoder context
* \param pBufBs bit streaming buffer
* \param kBsLen size in bytes length of bit streaming buffer input
* \param ppDst picture payload data to be output
* \param pDstBufInfo buf information of ouput data
*
* \return 0 - successed
* \return 1 - failed
*
* \note N/A
*************************************************************************************
*/
int32_t WelsDecodeBs (PWelsDecoderContext pCtx, const uint8_t* kpBsBuf, const int32_t kiBsLen,
uint8_t** ppDst, SBufferInfo* pDstBufInfo) {
if (!pCtx->bEndOfStreamFlag) {
SDataBuffer* pRawData = &pCtx->sRawData;
int32_t iSrcIdx = 0; //the index of source bit-stream till now after parsing one or more NALs
int32_t iSrcConsumed = 0; // consumed bit count of source bs
int32_t iDstIdx = 0; //the size of current NAL after 0x03 removal and 00 00 01 removal
int32_t iSrcLength = 0; //the total size of current AU or NAL
int32_t iConsumedBytes = 0;
int32_t iOffset = 0;
uint8_t* pSrcNal = NULL;
uint8_t* pDstNal = NULL;
uint8_t* pNalPayload = NULL;
if (NULL == DetectStartCodePrefix (kpBsBuf, &iOffset,
kiBsLen)) { //CAN'T find the 00 00 01 start prefix from the source buffer
return dsBitstreamError;
}
pSrcNal = const_cast<uint8_t*> (kpBsBuf) + iOffset;
iSrcLength = kiBsLen - iOffset;
if ((kiBsLen + 4) > (pRawData->pEnd - pRawData->pCurPos)) {
pRawData->pCurPos = pRawData->pHead;
}
//copy raw data from source buffer (application) to raw data buffer (codec inside)
//0x03 removal and extract all of NAL Unit from current raw data
pDstNal = pRawData->pCurPos + 4; //4-bytes used to write the length of current NAL rbsp
while (iSrcConsumed < iSrcLength) {
if ((2 + iSrcConsumed < iSrcLength) &&
(0 == LD16 (pSrcNal + iSrcIdx)) &&
((pSrcNal[2 + iSrcIdx] == 0x03) || (pSrcNal[2 + iSrcIdx] == 0x01))) {
if (pSrcNal[2 + iSrcIdx] == 0x03) {
ST16 (pDstNal + iDstIdx, 0);
iDstIdx += 2;
iSrcIdx += 3;
iSrcConsumed += 3;
} else {
GetValueOf4Bytes (pDstNal - 4, iDstIdx); //pDstNal-4 (non-aligned by 4) in Solaris10(SPARC). Given value by byte.
iConsumedBytes = 0;
pNalPayload = ParseNalHeader (pCtx, &pCtx->sCurNalHead, pDstNal, iDstIdx, pSrcNal - 3, iSrcIdx + 3, &iConsumedBytes);
if (pCtx->bAuReadyFlag) {
ConstructAccessUnit (pCtx, ppDst, pDstBufInfo);
if ((dsOutOfMemory | dsNoParamSets) & pCtx->iErrorCode) {
#ifdef LONG_TERM_REF
pCtx->bParamSetsLostFlag = true;
#else
pCtx->bReferenceLostAtT0Flag = true;
#endif
ResetParameterSetsState (pCtx);
if (dsOutOfMemory & pCtx->iErrorCode) {
return pCtx->iErrorCode;
}
}
}
if ((IS_PARAM_SETS_NALS (pCtx->sCurNalHead.eNalUnitType) || IS_SEI_NAL (pCtx->sCurNalHead.eNalUnitType)) &&
pNalPayload) {
if (ParseNonVclNal (pCtx, pNalPayload, iDstIdx - iConsumedBytes)) {
if (dsNoParamSets & pCtx->iErrorCode) {
#ifdef LONG_TERM_REF
pCtx->bParamSetsLostFlag = true;
#else
pCtx->bReferenceLostAtT0Flag = true;
#endif
ResetParameterSetsState (pCtx);
}
return pCtx->iErrorCode;
}
}
pDstNal += iDstIdx; //update current position
if ((iSrcLength - iSrcConsumed + 4) > (pRawData->pEnd - pDstNal)) {
pRawData->pCurPos = pRawData->pHead;
} else {
pRawData->pCurPos = pDstNal;
}
pDstNal = pRawData->pCurPos + 4; //init, 4 bytes used to store the next NAL
pSrcNal += iSrcIdx + 3;
iSrcConsumed += 3;
iSrcIdx = 0;
iDstIdx = 0; //reset 0, used to statistic the length of next NAL
}
continue;
}
pDstNal[iDstIdx++] = pSrcNal[iSrcIdx++];
iSrcConsumed++;
}
//last NAL decoding
GetValueOf4Bytes (pDstNal - 4, iDstIdx); //pDstNal-4 (non-aligned by 4) in Solaris10(SPARC). Given value by byte.
iConsumedBytes = 0;
pNalPayload = ParseNalHeader (pCtx, &pCtx->sCurNalHead, pDstNal, iDstIdx, pSrcNal - 3, iSrcIdx + 3, &iConsumedBytes);
if (pCtx->bAuReadyFlag) {
ConstructAccessUnit (pCtx, ppDst, pDstBufInfo);
if ((dsOutOfMemory | dsNoParamSets) & pCtx->iErrorCode) {
#ifdef LONG_TERM_REF
pCtx->bParamSetsLostFlag = true;
#else
pCtx->bReferenceLostAtT0Flag = true;
#endif
ResetParameterSetsState (pCtx);
return pCtx->iErrorCode;
}
}
if ((IS_PARAM_SETS_NALS (pCtx->sCurNalHead.eNalUnitType) || IS_SEI_NAL (pCtx->sCurNalHead.eNalUnitType))
&& pNalPayload) {
if (ParseNonVclNal (pCtx, pNalPayload, iDstIdx - iConsumedBytes)) {
if (dsNoParamSets & pCtx->iErrorCode) {
#ifdef LONG_TERM_REF
pCtx->bParamSetsLostFlag = true;
#else
pCtx->bReferenceLostAtT0Flag = true;
#endif
ResetParameterSetsState (pCtx);
}
return pCtx->iErrorCode;
}
}
pDstNal += iDstIdx;
pRawData->pCurPos = pDstNal; //init the pCurPos for next NAL(s) storage
} else { /* no supplementary picture payload input, but stored a picture */
PAccessUnit pCurAu =
pCtx->pAccessUnitList; // current access unit, it will never point to NULL after decode's successful initialization
if (pCurAu->uiAvailUnitsNum == 0) {
return pCtx->iErrorCode;
} else {
pCtx->pAccessUnitList->uiEndPos = pCtx->pAccessUnitList->uiAvailUnitsNum - 1;
ConstructAccessUnit (pCtx, ppDst, pDstBufInfo);
if ((dsOutOfMemory | dsNoParamSets) & pCtx->iErrorCode) {
#ifdef LONG_TERM_REF
pCtx->bParamSetsLostFlag = true;
#else
pCtx->bReferenceLostAtT0Flag = true;
#endif
ResetParameterSetsState (pCtx);
return pCtx->iErrorCode;
}
}
}
return pCtx->iErrorCode;
}
