ref: d34e209266a3f7bc95d2808e06767329bc3cf96c
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__