74 lines
2.7 KiB
C++
74 lines
2.7 KiB
C++
/*!
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* \copy
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* Copyright (c) 2004-2013, Cisco Systems
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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//bit_stream.h - bit-stream reading and / writing auxiliary data
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#ifndef WELS_BIT_STREAM_H__
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#define WELS_BIT_STREAM_H__
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#include "typedefs.h"
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namespace WelsDec {
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/*
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* Bit-stream auxiliary reading / writing
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*/
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typedef struct TagBitStringAux {
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uint8_t* pStartBuf; // buffer to start position
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uint8_t* pEndBuf; // buffer + length
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int32_t iBits; // count bits of overall bitstreaming input
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int32_t iIndex; //only for cavlc usage
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uint8_t* pCurBuf; // current reading position
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uint32_t uiCurBits;
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int32_t iLeftBits; // count number of available bits left ([1, 8]),
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// need pointer to next byte start position in case 0 bit left then 8 instead
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} SBitStringAux, *PBitStringAux;
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/*!
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* \brief input bits for decoder or initialize bitstream writing in encoder
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*
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* \param pBitString Bit string auxiliary pointer
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* \param kpBuf bit-stream buffer
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* \param kiSize size in bits for decoder; size in bytes for encoder
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*
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* \return size of buffer data in byte; failed in -1 return
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*/
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int32_t InitBits (PBitStringAux pBitString, const uint8_t* kpBuf, const int32_t kiSize);
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void InitReadBits (PBitStringAux pBitString);
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} // namespace WelsDec
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#endif//WELS_BIT_STREAM_H__
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