armVCM4P2_PutVLCBits.c revision 0c1bc742181ded4930842b46e9507372f0b1b963
1/** 2 * 3 * File Name: armVCM4P2_PutVLCBits.c 4 * OpenMAX DL: v1.0.2 5 * Revision: 9641 6 * Date: Thursday, February 7, 2008 7 * 8 * (c) Copyright 2007-2008 ARM Limited. All Rights Reserved. 9 * 10 * 11 * 12 * Description: 13 * Contains module for VLC put bits to bitstream 14 * 15 */ 16 17#include "omxtypes.h" 18#include "armOMX.h" 19 20#include "armVC.h" 21#include "armCOMM.h" 22#include "armCOMM_Bitstream.h" 23#include "armVCM4P2_ZigZag_Tables.h" 24#include "armVCM4P2_Huff_Tables_VLC.h" 25 26 27/** 28 * Function: armVCM4P2_PutVLCBits 29 * 30 * Description: 31 * Checks the type of Escape Mode and put encoded bits for 32 * quantized DCT coefficients. 33 * 34 * Remarks: 35 * 36 * Parameters: 37 * [in] ppBitStream pointer to the pointer to the current byte in 38 * the bit stream 39 * [in] pBitOffset pointer to the bit position in the byte pointed 40 * by *ppBitStream. Valid within 0 to 7 41 * [in] shortVideoHeader binary flag indicating presence of short_video_header; escape modes 0-3 are used if shortVideoHeader==0, 42 * and escape mode 4 is used when shortVideoHeader==1. 43 * [in] start start indicates whether the encoding begins with 44 * 0th element or 1st. 45 * [in] maxStoreRunL0 Max store possible (considering last and inter/intra) 46 * for last = 0 47 * [in] maxStoreRunL1 Max store possible (considering last and inter/intra) 48 * for last = 1 49 * [in] maxRunForMultipleEntriesL0 50 * The run value after which level 51 * will be equal to 1: 52 * (considering last and inter/intra status) for last = 0 53 * [in] maxRunForMultipleEntriesL1 54 * The run value after which level 55 * will be equal to 1: 56 * (considering last and inter/intra status) for last = 1 57 * [in] pRunIndexTableL0 Run Index table defined in 58 * armVCM4P2_Huff_Tables_VLC.c for last == 0 59 * [in] pVlcTableL0 VLC table for last == 0 60 * [in] pRunIndexTableL1 Run Index table defined in 61 * armVCM4P2_Huff_Tables_VLC.c for last == 1 62 * [in] pVlcTableL1 VLC table for last == 1 63 * [in] pLMAXTableL0 Level MAX table defined in 64 * armVCM4P2_Huff_Tables_VLC.c for last == 0 65 * [in] pLMAXTableL1 Level MAX table defined in 66 * armVCM4P2_Huff_Tables_VLC.c for last == 1 67 * [in] pRMAXTableL0 Run MAX table defined in 68 * armVCM4P2_Huff_Tables_VLC.c for last == 0 69 * [in] pRMAXTableL1 Run MAX table defined in 70 * armVCM4P2_Huff_Tables_VLC.c for last == 1 71 * [out] pQDctBlkCoef pointer to the quantized DCT coefficient 72 * [out] ppBitStream *ppBitStream is updated after the block is encoded 73 * so that it points to the current byte in the bit 74 * stream buffer. 75 * [out] pBitOffset *pBitOffset is updated so that it points to the 76 * current bit position in the byte pointed by 77 * *ppBitStream. 78 * 79 * Return Value: 80 * Standard OMXResult result. See enumeration for possible result codes. 81 * 82 */ 83 84 85OMXResult armVCM4P2_PutVLCBits ( 86 OMX_U8 **ppBitStream, 87 OMX_INT * pBitOffset, 88 const OMX_S16 *pQDctBlkCoef, 89 OMX_INT shortVideoHeader, 90 OMX_U8 start, 91 OMX_U8 maxStoreRunL0, 92 OMX_U8 maxStoreRunL1, 93 OMX_U8 maxRunForMultipleEntriesL0, 94 OMX_U8 maxRunForMultipleEntriesL1, 95 const OMX_U8 * pRunIndexTableL0, 96 const ARM_VLC32 *pVlcTableL0, 97 const OMX_U8 * pRunIndexTableL1, 98 const ARM_VLC32 *pVlcTableL1, 99 const OMX_U8 * pLMAXTableL0, 100 const OMX_U8 * pLMAXTableL1, 101 const OMX_U8 * pRMAXTableL0, 102 const OMX_U8 * pRMAXTableL1, 103 const OMX_U8 * pZigzagTable 104) 105{ 106 107 OMX_U32 storeRun = 0, run, storeRunPlus; 108 OMX_U8 last = 0, first = 1, fMode; 109 OMX_S16 level, storeLevel = 0, storeLevelPlus; 110 OMX_INT i; 111 112 /* RLE encoding and packing the bits into the streams */ 113 for (i = start, run=0; i < 64; i++) 114 { 115 level = pQDctBlkCoef[pZigzagTable[i]]; 116 117 /* Counting the run */ 118 if (level == 0) 119 { 120 run++; 121 } 122 123 /* Found a non-zero coeff */ 124 else 125 { 126 if (first == 0) 127 { 128 last = 0; 129 130 /* Check for a valid entry in the VLC table */ 131 storeLevelPlus = armSignCheck(storeLevel) * 132 (armAbs(storeLevel) - pLMAXTableL0[storeRun]); 133 storeRunPlus = storeRun - 134 (pRMAXTableL0[armAbs(storeLevel) - 1] + 1); 135 136 fMode = armVCM4P2_CheckVLCEscapeMode( 137 storeRun, 138 storeRunPlus, 139 storeLevel, 140 storeLevelPlus, 141 maxStoreRunL0, 142 maxRunForMultipleEntriesL0, 143 shortVideoHeader, 144 pRunIndexTableL0); 145 146 armVCM4P2_FillVLCBuffer ( 147 ppBitStream, 148 pBitOffset, 149 storeRun, 150 storeLevel, 151 storeRunPlus, 152 storeLevelPlus, 153 fMode, 154 last, 155 maxRunForMultipleEntriesL0, 156 pRunIndexTableL0, 157 pVlcTableL0); 158 } 159 storeLevel = level; 160 storeRun = run; 161 first = 0; 162 run = 0; 163 } 164 165 } /* end of for loop for 64 elements */ 166 167 /* writing the last element */ 168 last = 1; 169 170 /* Check for a valid entry in the VLC table */ 171 storeLevelPlus = armSignCheck(storeLevel) * 172 (armAbs(storeLevel) - pLMAXTableL1[run]); 173 storeRunPlus = storeRun - 174 (pRMAXTableL1[armAbs(storeLevel) - 1] + 1); 175 fMode = armVCM4P2_CheckVLCEscapeMode( 176 storeRun, 177 storeRunPlus, 178 storeLevel, 179 storeLevelPlus, 180 maxStoreRunL1, 181 maxRunForMultipleEntriesL1, 182 shortVideoHeader, 183 pRunIndexTableL1); 184 185 armVCM4P2_FillVLCBuffer ( 186 ppBitStream, 187 pBitOffset, 188 storeRun, 189 storeLevel, 190 storeRunPlus, 191 storeLevelPlus, 192 fMode, 193 last, 194 maxRunForMultipleEntriesL1, 195 pRunIndexTableL1, 196 pVlcTableL1); 197 return OMX_Sts_NoErr; 198} 199 200/* End of File */ 201