ref: e307cbb6a1c426e2dbb23054d02d6ebdaaa559c7
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__