ref: 3b55d649029e33007c15287547041c1be6c17409
dir: /codec/encoder/core/inc/svc_enc_golomb.h/
/*!
* \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 svc_enc_golomb.h
*
* \brief Exponential Golomb entropy coding routine
*
* \date 03/13/2009 Created
*
*************************************************************************************
*/
#ifndef WELS_EXPONENTIAL_GOLOMB_ENTROPY_CODING_H__
#define WELS_EXPONENTIAL_GOLOMB_ENTROPY_CODING_H__
#include "wels_common_defs.h"
#include "golomb_common.h"
using namespace WelsCommon;
namespace WelsEnc {
/************************************************************************/
/* GOLOMB CODIMG FOR WELS ENCODER ONLY */
/************************************************************************/
/*
* Get size of unsigned exp golomb codes
*/
static inline uint32_t BsSizeUE (const uint32_t kiValue) {
if (256 > kiValue) {
return g_kuiGolombUELength[kiValue];
} else {
uint32_t n = 0;
uint32_t iTmpValue = kiValue + 1;
if (iTmpValue & 0xffff0000) {
iTmpValue >>= 16;
n += 16;
}
if (iTmpValue & 0xff00) {
iTmpValue >>= 8;
n += 8;
}
//n += (g_kuiGolombUELength[iTmpValue] >> 1);
n += (g_kuiGolombUELength[iTmpValue - 1] >> 1);
return ((n << 1) + 1);
}
}
/*
* Get size of signed exp golomb codes
*/
static inline uint32_t BsSizeSE (const int32_t kiValue) {
uint32_t iTmpValue;
if (0 == kiValue) {
return 1;
} else if (0 < kiValue) {
iTmpValue = (kiValue << 1) - 1;
return BsSizeUE (iTmpValue);
} else {
iTmpValue = ((-kiValue) << 1);
return BsSizeUE (iTmpValue);
}
}
/*
* Write truncated exp golomb codes
*/
static inline void BsWriteTE (SBitStringAux* pBs, const int32_t kiX, const uint32_t kuiValue) {
if (1 == kiX) {
BsWriteOneBit (pBs, !kuiValue);
} else {
BsWriteUE (pBs, kuiValue);
}
}
static inline int32_t BsGetBitsPos (SBitStringAux* pBs) {
return (int32_t) (((pBs->pCurBuf - pBs->pStartBuf) << 3) + 32 - pBs->iLeftBits);
}
static inline void BsAlign( SBitStringAux* pBs )
{
if( pBs->iLeftBits&7 )
{
pBs->uiCurBits <<= pBs->iLeftBits&7;
pBs->uiCurBits |= (1 << (pBs->iLeftBits&7)) - 1;
pBs->iLeftBits &= ~7;
}
BsFlush(pBs );
}
}
#endif//WELS_EXPONENTIAL_GOLOMB_ENTROPY_CODING_H__