ref: 50a9389f0bacc7c7ee7c806302ac153d01b3ba5b
dir: /codec/common/inc/golomb_common.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 golomb_common.h * * \brief Exponential Golomb entropy coding/decoding routine * * \date 03/12/2015 Created * ************************************************************************************* */ #ifndef EXPONENTIAL_GOLOMB_ENTROPY_CODING_COMMON_H__ #define EXPONENTIAL_GOLOMB_ENTROPY_CODING_COMMON_H__ #include "typedefs.h" namespace WelsCommon { #define WRITE_BE_32(ptr, val) do { \ (ptr)[0] = (val) >> 24; \ (ptr)[1] = (val) >> 16; \ (ptr)[2] = (val) >> 8; \ (ptr)[3] = (val) >> 0; \ } while (0) /************************************************************************/ /* GOLOMB CODIMG FOR WELS COMMON */ /************************************************************************/ /*! * \brief initialize bitstream writing * * \param pBs Bit string auxiliary pointer * \param pBuf bit-stream pBuffer * \param iSize iSize in bits for decoder; iSize in bytes for encoder * * \return iSize of pBuffer pData in byte; failed in -1 return */ static inline int32_t InitBits (SBitStringAux* pBs, const uint8_t* kpBuf, const int32_t kiSize) { uint8_t* ptr = (uint8_t*)kpBuf; pBs->pStartBuf = ptr; pBs->pCurBuf = ptr; pBs->pEndBuf = ptr + kiSize; pBs->iLeftBits = 32; pBs->uiCurBits = 0; return kiSize; } static inline int32_t BsWriteBits (PBitStringAux pBitString, int32_t iLen, const uint32_t kuiValue) { if (iLen < pBitString->iLeftBits) { pBitString->uiCurBits = (pBitString->uiCurBits << iLen) | kuiValue; pBitString->iLeftBits -= iLen; } else { iLen -= pBitString->iLeftBits; pBitString->uiCurBits = (pBitString->uiCurBits << pBitString->iLeftBits) | (kuiValue >> iLen); WRITE_BE_32 (pBitString->pCurBuf, pBitString->uiCurBits); pBitString->pCurBuf += 4; pBitString->uiCurBits = kuiValue & ((1 << iLen) - 1); pBitString->iLeftBits = 32 - iLen; } return 0; } /* * Write 1 bit */ static inline int32_t BsWriteOneBit (PBitStringAux pBitString, const uint32_t kuiValue) { BsWriteBits (pBitString, 1, kuiValue); return 0; } static inline int32_t BsFlush (PBitStringAux pBitString) { WRITE_BE_32 (pBitString->pCurBuf, pBitString->uiCurBits << pBitString->iLeftBits); pBitString->pCurBuf += 4 - pBitString->iLeftBits / 8; pBitString->iLeftBits = 32; pBitString->uiCurBits = 0; return 0; } /* * Write unsigned exp golomb codes */ static inline int32_t BsWriteUE (PBitStringAux pBitString, const uint32_t kuiValue) { uint32_t iTmpValue = kuiValue + 1; if (256 > kuiValue) { BsWriteBits (pBitString, g_kuiGolombUELength[kuiValue], kuiValue + 1); } else { uint32_t n = 0; 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); BsWriteBits (pBitString, (n << 1) + 1, kuiValue + 1); } return 0; } /* * Write signed exp golomb codes */ static inline int32_t BsWriteSE (PBitStringAux pBitString, const int32_t kiValue) { uint32_t iTmpValue; if (0 == kiValue) { BsWriteOneBit (pBitString, 1); } else if (0 < kiValue) { iTmpValue = (kiValue << 1) - 1; BsWriteUE (pBitString, iTmpValue); } else { iTmpValue = ((-kiValue) << 1); BsWriteUE (pBitString, iTmpValue); } return 0; } /* * Write RBSP trailing bits */ static inline int32_t BsRbspTrailingBits (PBitStringAux pBitString) { BsWriteOneBit (pBitString, 1); BsFlush (pBitString); return 0; } } #endif//EXPONENTIAL_GOLOMB_ENTROPY_CODING_COMMON_H__