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| 1 | /*! | ||
| 2 | * \copy | ||
| 3 | * Copyright (c) 2009-2013, Cisco Systems | ||
| 4 | * All rights reserved. | ||
| 5 | * | ||
| 6 | * Redistribution and use in source and binary forms, with or without | ||
| 7 | * modification, are permitted provided that the following conditions | ||
| 8 | * are met: | ||
| 9 | * | ||
| 10 | * * Redistributions of source code must retain the above copyright | ||
| 11 | * notice, this list of conditions and the following disclaimer. | ||
| 12 | * | ||
| 13 | * * Redistributions in binary form must reproduce the above copyright | ||
| 14 | * notice, this list of conditions and the following disclaimer in | ||
| 15 | * the documentation and/or other materials provided with the | ||
| 16 | * distribution. | ||
| 17 | * | ||
| 18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | ||
| 19 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | ||
| 20 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS | ||
| 21 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE | ||
| 22 | * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, | ||
| 23 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, | ||
| 24 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | ||
| 25 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER | ||
| 26 | * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | ||
| 27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN | ||
| 28 | * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | ||
| 29 | * POSSIBILITY OF SUCH DAMAGE. | ||
| 30 | * | ||
| 31 | * | ||
| 32 | * \file bit_stream.cpp | ||
| 33 | * | ||
| 34 | * \brief Reading / writing bit-stream | ||
| 35 | * | ||
| 36 | * \date 03/10/2009 Created | ||
| 37 | * | ||
| 38 | ************************************************************************************* | ||
| 39 | */ | ||
| 40 | #include "bit_stream.h" | ||
| 41 | #include "macros.h" | ||
| 42 | |||
| 43 | namespace WelsDec { | ||
| 44 | |||
| 45 | #ifdef WORDS_BIGENDIAN | ||
| 46 | inline uint32_t EndianFix(uint32_t uiX) | ||
| 47 | { | ||
| 48 | return uiX; | ||
| 49 | } | ||
| 50 | #else //WORDS_BIGENDIAN | ||
| 51 | |||
| 52 | #ifdef _MSC_VER | ||
| 53 | inline uint32_t EndianFix(uint32_t uiX) | ||
| 54 | { | ||
| 55 | __asm | ||
| 56 | { | ||
| 57 | mov eax, uiX | ||
| 58 | bswap eax | ||
| 59 | mov uiX, eax | ||
| 60 | } | ||
| 61 | return uiX; | ||
| 62 | } | ||
| 63 | #else //_MSC_VER | ||
| 64 | |||
| 65 | inline uint32_t EndianFix(uint32_t uiX) | ||
| 66 | { | ||
| 67 | #ifdef ARM_ARCHv7 | ||
| 68 | __asm__ __volatile__("rev %0, %0":"+r"(uiX)); //Just for the ARMv7 | ||
| 69 | #elif defined (X86_ARCH) | ||
| 70 | __asm__ __volatile__("bswap %0":"+r"(uiX)); | ||
| 71 | #else | ||
| 72 | uiX = ((uiX & 0xff000000)>> 24) | ((uiX & 0xff0000) >> 8) | | ||
| 73 | ((uiX & 0xff00) << 8) | ((uiX&0xff) << 24); | ||
| 74 | #endif | ||
| 75 | return uiX; | ||
| 76 | } | ||
| 77 | #endif //_MSC_VER | ||
| 78 | |||
| 79 | #endif //WORDS_BIGENDIAN | ||
| 80 | |||
| 81 | inline uint32_t GetValue4Bytes( uint8_t* pDstNal ) | ||
| 82 | { | ||
| 83 | uint32_t uiValue = 0; | ||
| 84 | uiValue = (pDstNal[0]<<24) | (pDstNal[1]<<16) | (pDstNal[2]<<8) | (pDstNal[3]); | ||
| 85 | return uiValue; | ||
| 86 | } | ||
| 87 | |||
| 88 | void_t InitReadBits( PBitStringAux pBitString ) | ||
| 89 | { | ||
| 90 | pBitString->uiCurBits = GetValue4Bytes( pBitString->pCurBuf ); | ||
| 91 | pBitString->pCurBuf += 4; | ||
| 92 | pBitString->iLeftBits = -16; | ||
| 93 | } | ||
| 94 | |||
| 95 | /*! | ||
| 96 | * \brief input bits for decoder or initialize bitstream writing in encoder | ||
| 97 | * | ||
| 98 | * \param pBitString Bit string auxiliary pointer | ||
| 99 | * \param kpBuf bit-stream buffer | ||
| 100 | * \param kiSize size in bits for decoder; size in bytes for encoder | ||
| 101 | * | ||
| 102 | * \return size of buffer data in byte; failed in -1 return | ||
| 103 | */ | ||
| 104 | int32_t InitBits( PBitStringAux pBitString, const uint8_t *kpBuf, const int32_t kiSize ) | ||
| 105 | { | ||
| 106 | const int32_t kiSizeBuf = (kiSize + 7) >> 3; | ||
| 107 | uint8_t *pTmp = (uint8_t *)kpBuf; | ||
| 108 | |||
| 109 | if ( NULL == pTmp ) | ||
| 110 | return -1; | ||
| 111 | |||
| 112 | pBitString->pStartBuf = pTmp; // buffer to start position | ||
| 113 | pBitString->pEndBuf = pTmp + kiSizeBuf; // buffer + length | ||
| 114 | pBitString->iBits = kiSize; // count bits of overall bitstreaming inputindex; | ||
| 115 | |||
| 116 | pBitString->pCurBuf = pBitString->pStartBuf; | ||
| 117 | InitReadBits( pBitString ); | ||
| 118 | |||
| 119 | return kiSizeBuf; | ||
| 120 | } | ||
| 121 | |||
| 122 | } // namespace WelsDec | ||
| 123 | |||