/*! * \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	bit_stream.cpp * * \brief	Reading / writing bit-stream * * \date	03/10/2009 Created * ************************************************************************************* */#include "bit_stream.h"#include "macros.h" namespace WelsDec { #ifdef WORDS_BIGENDIANinline uint32_t EndianFix(uint32_t uiX){	return uiX;}#else //WORDS_BIGENDIAN #ifdef _MSC_VERinline uint32_t EndianFix(uint32_t uiX){	__asm	{		mov   eax,  uiX		bswap   eax		mov   uiX,    eax	}	return uiX;}#else  //_MSC_VER inline uint32_t EndianFix(uint32_t uiX){#ifdef ARM_ARCHv7	__asm__ __volatile__("rev %0, %0":"+r"(uiX)); //Just for the ARMv7 #elif defined (X86_ARCH)	__asm__ __volatile__("bswap %0":"+r"(uiX));#else    uiX = ((uiX & 0xff000000)>> 24) | ((uiX & 0xff0000) >> 8) |        ((uiX & 0xff00) << 8) | ((uiX&0xff) << 24);#endif		return uiX;}#endif //_MSC_VER #endif //WORDS_BIGENDIAN inline uint32_t GetValue4Bytes( uint8_t* pDstNal ){	uint32_t uiValue = 0;	uiValue = (pDstNal[0]<<24) | (pDstNal[1]<<16) | (pDstNal[2]<<8) | (pDstNal[3]);	return uiValue;} void_t InitReadBits( PBitStringAux pBitString ){	pBitString->uiCurBits  = GetValue4Bytes( pBitString->pCurBuf );	pBitString->pCurBuf  += 4;	pBitString->iLeftBits = -16;} /*! * \brief	input bits for decoder or initialize bitstream writing in encoder * * \param	pBitString	Bit string auxiliary pointer * \param	kpBuf		bit-stream buffer * \param	kiSize	    size in bits for decoder; size in bytes for encoder * * \return	size of buffer data in byte; failed in -1 return */int32_t InitBits( PBitStringAux pBitString, const uint8_t *kpBuf, const int32_t kiSize ){		const int32_t kiSizeBuf = (kiSize + 7) >> 3;	uint8_t *pTmp = (uint8_t *)kpBuf; 	if ( NULL == pTmp )		return -1; 	pBitString->pStartBuf   = pTmp;				// buffer to start position	pBitString->pEndBuf	    = pTmp + kiSizeBuf;	// buffer + length	pBitString->iBits	    = kiSize;				// count bits of overall bitstreaming inputindex; 	pBitString->pCurBuf   = pBitString->pStartBuf;	InitReadBits( pBitString ); 	return kiSizeBuf;} } // namespace WelsDec