ref: 063709c92e8bafe467d384f564afbdc6b66eb39a
dir: /codec/encoder/core/src/nal_encap.cpp/
/*!
* \copy
* Copyright (c) 2009-2013, Cisco Systems
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*
* \file nal_encap.c
*
* \brief NAL pRawNal pData encapsulation
*
* \date 5/25/2009 Created
*
*************************************************************************************/
#include "nal_encap.h"
#include "svc_enc_golomb.h"
#include "ls_defines.h"
namespace WelsSVCEnc {
/*!
* \brief load an initialize NAL pRawNal pData
*/
void WelsLoadNal( SWelsEncoderOutput *pEncoderOuput, const int32_t/*EWelsNalUnitType*/ kiType, const int32_t/*EWelsNalRefIdc*/ kiNalRefIdc )
{
SWelsEncoderOutput *pWelsEncoderOuput = pEncoderOuput;
SWelsNalRaw *pRawNal = &pWelsEncoderOuput->sNalList[ pWelsEncoderOuput->iNalIndex ];
SNalUnitHeader *sNalHeader = &pRawNal->sNalExt.sNalHeader;
const int32_t kiStartPos = (BsGetBitsPos(&pWelsEncoderOuput->sBsWrite) >> 3);
sNalHeader->eNalUnitType = (EWelsNalUnitType)kiType;
sNalHeader->uiNalRefIdc = (EWelsNalRefIdc)kiNalRefIdc;
sNalHeader->uiForbiddenZeroBit = 0;
pRawNal->pRawData = &pWelsEncoderOuput->pBsBuffer[kiStartPos];
pRawNal->iPayloadSize = 0;
}
/*!
* \brief unload pRawNal NAL
*/
void WelsUnloadNal( SWelsEncoderOutput *pEncoderOuput )
{
SWelsEncoderOutput *pWelsEncoderOuput= pEncoderOuput;
int32_t *pIdx = &pWelsEncoderOuput->iNalIndex;
SWelsNalRaw *pRawNal = &pWelsEncoderOuput->sNalList[ *pIdx ];
const int32_t kiEndPos = (BsGetBitsPos(&pWelsEncoderOuput->sBsWrite) >> 3);
/* count payload size of pRawNal NAL */
pRawNal->iPayloadSize = &pWelsEncoderOuput->pBsBuffer[kiEndPos] - pRawNal->pRawData;
++ (*pIdx);
}
/*!
* \brief load an initialize NAL pRawNal pData
*/
void WelsLoadNalForSlice( SWelsSliceBs *pSliceBsIn, const int32_t/*EWelsNalUnitType*/ kiType, const int32_t/*EWelsNalRefIdc*/ kiNalRefIdc )
{
SWelsSliceBs *pSliceBs = pSliceBsIn;
SWelsNalRaw *pRawNal = &pSliceBs->sNalList[ pSliceBs->iNalIndex ];
SNalUnitHeader *sNalHeader = &pRawNal->sNalExt.sNalHeader;
SBitStringAux *pBitStringAux = &pSliceBs->sBsWrite;
const int32_t kiStartPos = (BsGetBitsPos(pBitStringAux) >> 3);
sNalHeader->eNalUnitType = (EWelsNalUnitType)kiType;
sNalHeader->uiNalRefIdc = (EWelsNalRefIdc)kiNalRefIdc;
sNalHeader->uiForbiddenZeroBit = 0;
pRawNal->pRawData = &pSliceBs->pBsBuffer[kiStartPos];
pRawNal->iPayloadSize = 0;
}
/*!
* \brief unload pRawNal NAL
*/
void WelsUnloadNalForSlice( SWelsSliceBs *pSliceBsIn )
{
SWelsSliceBs *pSliceBs = pSliceBsIn;
int32_t *pIdx = &pSliceBs->iNalIndex;
SWelsNalRaw *pRawNal = &pSliceBs->sNalList[ *pIdx ];
SBitStringAux *pBitStringAux = &pSliceBs->sBsWrite;
const int32_t kiEndPos = (BsGetBitsPos(pBitStringAux) >> 3);
/* count payload size of pRawNal NAL */
pRawNal->iPayloadSize = &pSliceBs->pBsBuffer[kiEndPos] - pRawNal->pRawData;
++ (*pIdx);
}
/*!
* \brief encode NAL with emulation forbidden three bytes checking
* \param pDst pDst NAL pData
* \param pDstLen length of pDst NAL output
* \param annexeb annexeb flag
* \param pRawNal pRawNal NAL pData
* \return length of pDst NAL
*/
int32_t WelsEncodeNal( SWelsNalRaw *pRawNal, void *pDst, int32_t *pDstLen )
{
uint8_t *pDstStart = (uint8_t *)pDst;
uint8_t *pDstPointer = pDstStart;
uint8_t *pSrcPointer = pRawNal->pRawData;
uint8_t *pSrcEnd = pRawNal->pRawData + pRawNal->iPayloadSize;
int32_t iZeroCount = 0;
int32_t iNalLength = 0;
static const uint8_t kuiStartCodePrefix[4] = { 0, 0, 0, 1 };
ST32( pDstPointer, LD32(&kuiStartCodePrefix[0]) );
pDstPointer += 4;
/* NAL Unit Header */
*pDstPointer++ = ( pRawNal->sNalExt.sNalHeader.uiNalRefIdc << 5 ) | (pRawNal->sNalExt.sNalHeader.eNalUnitType & 0x1f);
while ( pSrcPointer < pSrcEnd ) {
if ( iZeroCount == 2 && *pSrcPointer <= 3 )
{
*pDstPointer++ = 3;
iZeroCount = 0;
}
if ( *pSrcPointer == 0 )
{
++ iZeroCount;
}
else
{
iZeroCount = 0;
}
*pDstPointer++ = *pSrcPointer++;
}
/* count length of NAL Unit */
iNalLength = pDstPointer - pDstStart;
if ( NULL != pDstLen )
*pDstLen = iNalLength;
return iNalLength;
}
/*!
* \brief encode a nal into a pBuffer for any type of NAL, involved WelsEncodeNal introduced in AVC
*
* \param pDst pDst NAL pData
* \param pDstLen length of pDst NAL output
* \param annexeb annexeb flag
* \param pRawNal pRawNal NAL pData
* \param pNalHeaderExt pointer of SNalUnitHeaderExt
*
* \return length of pDst NAL
*/
int32_t WelsEncodeNalExt( SWelsNalRaw *pRawNal, void *pNalHeaderExt, void *pDst, int32_t *pDstLen )
{
SNalUnitHeaderExt *sNalExt = (SNalUnitHeaderExt *)pNalHeaderExt;
uint8_t *pDstStart = (uint8_t *)pDst;
uint8_t *pDstPointer = pDstStart;
uint8_t *pSrcPointer = pRawNal->pRawData;
uint8_t *pSrcEnd = pRawNal->pRawData + pRawNal->iPayloadSize;
int32_t iZeroCount = 0;
int32_t iNalLength = 0;
if ( pRawNal->sNalExt.sNalHeader.eNalUnitType != NAL_UNIT_PREFIX && pRawNal->sNalExt.sNalHeader.eNalUnitType != NAL_UNIT_CODED_SLICE_EXT )
{
return WelsEncodeNal( pRawNal, pDst, pDstLen );
}
/* FIXME this code doesn't check overflow */
static const uint8_t kuiStartCodePrefixExt[4]= { 0, 0, 0, 1 };
ST32( pDstPointer, LD32(&kuiStartCodePrefixExt[0]) );
pDstPointer += 4;
/* NAL Unit Header */
*pDstPointer++ = ( pRawNal->sNalExt.sNalHeader.uiNalRefIdc << 5 ) | (pRawNal->sNalExt.sNalHeader.eNalUnitType & 0x1f);
/* NAL UNIT Extension Header */
*pDstPointer++ = (0x80) |
(sNalExt->bIdrFlag << 6);
*pDstPointer++ = (0x80) |
(sNalExt->uiDependencyId << 4);
*pDstPointer++ = (sNalExt->uiTemporalId << 5) |
(sNalExt->bDiscardableFlag << 3) |
(0x07);
while ( pSrcPointer < pSrcEnd ) {
if ( iZeroCount == 2 && *pSrcPointer <= 3 )
{
*pDstPointer++ = 3;
iZeroCount = 0;
}
if ( *pSrcPointer == 0 )
{
++ iZeroCount;
}
else
{
iZeroCount = 0;
}
*pDstPointer++ = *pSrcPointer++;
}
/* count length of NAL Unit */
iNalLength = pDstPointer - pDstStart;
if ( NULL != pDstLen )
*pDstLen = iNalLength;
return iNalLength;
}
/*!
* \brief write prefix nal
*/
int32_t WelsWriteSVCPrefixNal( SBitStringAux *pBitStringAux, const int32_t kiNalRefIdc,
const bool_t kbIdrFlag )
{
if ( 0 < kiNalRefIdc ){
BsWriteOneBit( pBitStringAux, false/*bStoreRefBasePicFlag*/ );
BsWriteOneBit( pBitStringAux, false );
BsRbspTrailingBits( pBitStringAux );
BsFlush( pBitStringAux );
}
return 0;
}
} // namespace WelsSVCEnc