80862eec77
TRUE/FALSE has intentionally been left in use for the few platform specific APIs that define these constants themselves and expect them to be used, for consistency.
218 lines
5.6 KiB
C++
218 lines
5.6 KiB
C++
/*!
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* \copy
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* Copyright (c) 2009-2013, Cisco Systems
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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*
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* \file golomb.h
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*
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* \brief Exponential Golomb entropy coding/decoding routine
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*
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* \date 03/13/2009 Created
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*
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*************************************************************************************
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*/
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#ifndef WELS_EXPONENTIAL_GOLOMB_ENTROPY_CODING_H__
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#define WELS_EXPONENTIAL_GOLOMB_ENTROPY_CODING_H__
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#include "typedefs.h"
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#include "bit_stream.h"
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#include "macros.h"
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//#include <assert.h>
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#include "ls_defines.h"
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namespace WelsDec {
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#define GET_WORD(iCurBits, pBufPtr, iLeftBits) { \
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iCurBits |= ((pBufPtr[0] << 8) | pBufPtr[1]) << (iLeftBits); \
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iLeftBits -= 16; \
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pBufPtr +=2; \
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}
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#define NEED_BITS(iCurBits, pBufPtr, iLeftBits) { \
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if( iLeftBits > 0 ) { \
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GET_WORD(iCurBits, pBufPtr, iLeftBits); \
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} \
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}
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#define UBITS(iCurBits, iNumBits) (iCurBits>>(32-(iNumBits)))
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#define DUMP_BITS(iCurBits, pBufPtr, iLeftBits, iNumBits) { \
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iCurBits <<= (iNumBits); \
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iLeftBits += (iNumBits); \
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NEED_BITS(iCurBits, pBufPtr, iLeftBits); \
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}
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static inline int32_t ShowBits (PBitStringAux pBs, int32_t iNumBits) {
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return UBITS (pBs->uiCurBits, iNumBits);
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}
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static inline void FlushBits (PBitStringAux pBs, int32_t iNumBits) {
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DUMP_BITS (pBs->uiCurBits, pBs->pCurBuf, pBs->iLeftBits, iNumBits);
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}
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static inline int32_t BsGetBits (PBitStringAux pBs, int32_t iNumBits) {
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int32_t iRc = UBITS (pBs->uiCurBits, iNumBits);
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DUMP_BITS (pBs->uiCurBits, pBs->pCurBuf, pBs->iLeftBits, iNumBits);
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return iRc;
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}
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/*
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* Exponential Golomb codes decoding routines
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*/
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// for data sharing cross modules and try to reduce size of binary generated, 12/10/2009
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extern const uint8_t g_kuiIntra4x4CbpTable[48];
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extern const uint8_t g_kuiInterCbpTable[48];
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extern const uint8_t g_kuiLeadingZeroTable[256];
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static const uint32_t g_kuiPrefix8BitsTable[16] = {
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0, 0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3
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};
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static inline uint32_t GetPrefixBits (uint32_t uiValue) {
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uint32_t iNumBit = 0;
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if (uiValue & 0xffff0000) {
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uiValue >>= 16;
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iNumBit += 16;
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}
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if (uiValue & 0xff00) {
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uiValue >>= 8;
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iNumBit += 8;
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}
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if (uiValue & 0xf0) {
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uiValue >>= 4;
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iNumBit += 4;
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}
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iNumBit += g_kuiPrefix8BitsTable[uiValue];
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return (32 - iNumBit);
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}
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/*
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* Read one bit from bit stream followed
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*/
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static inline uint32_t BsGetOneBit (PBitStringAux pBs) {
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return (BsGetBits (pBs, 1));
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}
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static inline int32_t GetLeadingZeroBits (uint32_t iCurBits) { //<=16 bits
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int32_t iValue;
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iValue = UBITS (iCurBits, 8); //ShowBits( bs, 8 );
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if (iValue) {
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return g_kuiLeadingZeroTable[iValue];
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}
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iValue = UBITS (iCurBits, 16); //ShowBits( bs, 16 );
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if (iValue) {
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return (g_kuiLeadingZeroTable[iValue] + 8);
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}
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//ASSERT(false); // should not go here
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return -1;
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}
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static inline uint32_t BsGetUe (PBitStringAux pBs) {
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uint32_t iValue = 0;
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int32_t iLeadingZeroBits = GetLeadingZeroBits (pBs->uiCurBits);
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if (iLeadingZeroBits == -1) { //bistream error
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return 0xffffffff;//-1
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}
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DUMP_BITS (pBs->uiCurBits, pBs->pCurBuf, pBs->iLeftBits, iLeadingZeroBits + 1);
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if (iLeadingZeroBits) {
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iValue = UBITS (pBs->uiCurBits, iLeadingZeroBits);
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DUMP_BITS (pBs->uiCurBits, pBs->pCurBuf, pBs->iLeftBits, iLeadingZeroBits);
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}
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return ((1 << iLeadingZeroBits) - 1 + iValue);
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}
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/*
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* Read signed exp golomb codes
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*/
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static inline int32_t BsGetSe (PBitStringAux pBs) {
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uint32_t uiCodeNum;
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uiCodeNum = BsGetUe (pBs);
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if (uiCodeNum & 0x01) {
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return (int32_t) ((uiCodeNum + 1) >> 1);
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} else {
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return NEG_NUM ((int32_t) (uiCodeNum >> 1));
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}
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}
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/*
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* Read truncated exp golomb codes
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*/
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static inline uint32_t BsGetTe (PBitStringAux pBs, uint8_t uiRange) {
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if (1 == uiRange) {
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return BsGetOneBit (pBs) ^ 1;
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} else {
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return BsGetUe (pBs);
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}
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}
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/*
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* Get unsigned truncated exp golomb code.
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*/
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static inline int32_t BsGetTe0 (PBitStringAux pBs, int32_t iRange) {
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if (iRange == 1)
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return 0;
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else if (iRange == 2)
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return BsGetOneBit (pBs) ^ 1;
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else
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return BsGetUe (pBs);
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}
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/*
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* Get number of trailing bits
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*/
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static inline int32_t BsGetTrailingBits (uint8_t* pBuf) {
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// TODO
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uint32_t uiValue = *pBuf;
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int32_t iRetNum = 1;
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do {
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if (uiValue & 1)
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return iRetNum;
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uiValue >>= 1;
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++ iRetNum;
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} while (iRetNum < 9);
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return 0;
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}
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} // namespace WelsDec
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#endif//WELS_EXPONENTIAL_GOLOMB_ENTROPY_CODING_H__
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