ref: 04dba61d22ab43c1f428302f2abbaecca723fe30
dir: /codec/encoder/core/inc/bit_stream.h/
/*! * \copy * Copyright (c) 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. * */ //bit_stream.h - bit-stream reading and / writing auxiliary pData #ifndef WELS_BIT_STREAM_H__ #define WELS_BIT_STREAM_H__ #include "typedefs.h" //#include "macros.h" /* * auxiliary struct for bit-stream reading / writing */ typedef struct TagBitStringAux { uint8_t* pBuf; // pBuffer to start position uint8_t* pBufEnd; // pBuffer + length uint8_t* pBufPtr; // current writing position uint32_t uiCurBits; int32_t iLeftBits; // count number of available bits left ([1, 8]), // need pointer to next byte start position in case 0 bit left then 8 instead } SBitStringAux; /*! * \brief input bits for decoder or initialize bitstream writing in encoder * * \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->pBuf = ptr; pBs->pBufPtr = ptr; pBs->pBufEnd = ptr + kiSize; pBs->iLeftBits = 32; pBs->uiCurBits = 0; return kiSize; } #endif//WELS_BIT_STREAM_H__