1 /* 2 * Copyright (C) 2007-2008 ARM Limited 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 * 16 */ 17 /** 18 * 19 * File Name: armVCM4P2_PutVLCBits.c 20 * OpenMAX DL: v1.0.2 21 * Revision: 9641 22 * Date: Thursday, February 7, 2008 23 * 24 * 25 * 26 * 27 * Description: 28 * Contains module for VLC put bits to bitstream 29 * 30 */ 31 32 #include "omxtypes.h" 33 #include "armOMX.h" 34 35 #include "armVC.h" 36 #include "armCOMM.h" 37 #include "armCOMM_Bitstream.h" 38 #include "armVCM4P2_ZigZag_Tables.h" 39 #include "armVCM4P2_Huff_Tables_VLC.h" 40 41 42 /** 43 * Function: armVCM4P2_PutVLCBits 44 * 45 * Description: 46 * Checks the type of Escape Mode and put encoded bits for 47 * quantized DCT coefficients. 48 * 49 * Remarks: 50 * 51 * Parameters: 52 * [in] ppBitStream pointer to the pointer to the current byte in 53 * the bit stream 54 * [in] pBitOffset pointer to the bit position in the byte pointed 55 * by *ppBitStream. Valid within 0 to 7 56 * [in] shortVideoHeader binary flag indicating presence of short_video_header; escape modes 0-3 are used if shortVideoHeader==0, 57 * and escape mode 4 is used when shortVideoHeader==1. 58 * [in] start start indicates whether the encoding begins with 59 * 0th element or 1st. 60 * [in] maxStoreRunL0 Max store possible (considering last and inter/intra) 61 * for last = 0 62 * [in] maxStoreRunL1 Max store possible (considering last and inter/intra) 63 * for last = 1 64 * [in] maxRunForMultipleEntriesL0 65 * The run value after which level 66 * will be equal to 1: 67 * (considering last and inter/intra status) for last = 0 68 * [in] maxRunForMultipleEntriesL1 69 * The run value after which level 70 * will be equal to 1: 71 * (considering last and inter/intra status) for last = 1 72 * [in] pRunIndexTableL0 Run Index table defined in 73 * armVCM4P2_Huff_Tables_VLC.c for last == 0 74 * [in] pVlcTableL0 VLC table for last == 0 75 * [in] pRunIndexTableL1 Run Index table defined in 76 * armVCM4P2_Huff_Tables_VLC.c for last == 1 77 * [in] pVlcTableL1 VLC table for last == 1 78 * [in] pLMAXTableL0 Level MAX table defined in 79 * armVCM4P2_Huff_Tables_VLC.c for last == 0 80 * [in] pLMAXTableL1 Level MAX table defined in 81 * armVCM4P2_Huff_Tables_VLC.c for last == 1 82 * [in] pRMAXTableL0 Run MAX table defined in 83 * armVCM4P2_Huff_Tables_VLC.c for last == 0 84 * [in] pRMAXTableL1 Run MAX table defined in 85 * armVCM4P2_Huff_Tables_VLC.c for last == 1 86 * [out] pQDctBlkCoef pointer to the quantized DCT coefficient 87 * [out] ppBitStream *ppBitStream is updated after the block is encoded 88 * so that it points to the current byte in the bit 89 * stream buffer. 90 * [out] pBitOffset *pBitOffset is updated so that it points to the 91 * current bit position in the byte pointed by 92 * *ppBitStream. 93 * 94 * Return Value: 95 * Standard OMXResult result. See enumeration for possible result codes. 96 * 97 */ 98 99 100 OMXResult armVCM4P2_PutVLCBits ( 101 OMX_U8 **ppBitStream, 102 OMX_INT * pBitOffset, 103 const OMX_S16 *pQDctBlkCoef, 104 OMX_INT shortVideoHeader, 105 OMX_U8 start, 106 OMX_U8 maxStoreRunL0, 107 OMX_U8 maxStoreRunL1, 108 OMX_U8 maxRunForMultipleEntriesL0, 109 OMX_U8 maxRunForMultipleEntriesL1, 110 const OMX_U8 * pRunIndexTableL0, 111 const ARM_VLC32 *pVlcTableL0, 112 const OMX_U8 * pRunIndexTableL1, 113 const ARM_VLC32 *pVlcTableL1, 114 const OMX_U8 * pLMAXTableL0, 115 const OMX_U8 * pLMAXTableL1, 116 const OMX_U8 * pRMAXTableL0, 117 const OMX_U8 * pRMAXTableL1, 118 const OMX_U8 * pZigzagTable 119 ) 120 { 121 122 OMX_U32 storeRun = 0, run, storeRunPlus; 123 OMX_U8 last = 0, first = 1, fMode; 124 OMX_S16 level, storeLevel = 0, storeLevelPlus; 125 OMX_INT i; 126 127 /* RLE encoding and packing the bits into the streams */ 128 for (i = start, run=0; i < 64; i++) 129 { 130 level = pQDctBlkCoef[pZigzagTable[i]]; 131 132 /* Counting the run */ 133 if (level == 0) 134 { 135 run++; 136 } 137 138 /* Found a non-zero coeff */ 139 else 140 { 141 if (first == 0) 142 { 143 last = 0; 144 145 /* Check for a valid entry in the VLC table */ 146 storeLevelPlus = armSignCheck(storeLevel) * 147 (armAbs(storeLevel) - pLMAXTableL0[storeRun]); 148 storeRunPlus = storeRun - 149 (pRMAXTableL0[armAbs(storeLevel) - 1] + 1); 150 151 fMode = armVCM4P2_CheckVLCEscapeMode( 152 storeRun, 153 storeRunPlus, 154 storeLevel, 155 storeLevelPlus, 156 maxStoreRunL0, 157 maxRunForMultipleEntriesL0, 158 shortVideoHeader, 159 pRunIndexTableL0); 160 161 armVCM4P2_FillVLCBuffer ( 162 ppBitStream, 163 pBitOffset, 164 storeRun, 165 storeLevel, 166 storeRunPlus, 167 storeLevelPlus, 168 fMode, 169 last, 170 maxRunForMultipleEntriesL0, 171 pRunIndexTableL0, 172 pVlcTableL0); 173 } 174 storeLevel = level; 175 storeRun = run; 176 first = 0; 177 run = 0; 178 } 179 180 } /* end of for loop for 64 elements */ 181 182 /* writing the last element */ 183 last = 1; 184 185 /* Check for a valid entry in the VLC table */ 186 storeLevelPlus = armSignCheck(storeLevel) * 187 (armAbs(storeLevel) - pLMAXTableL1[run]); 188 storeRunPlus = storeRun - 189 (pRMAXTableL1[armAbs(storeLevel) - 1] + 1); 190 fMode = armVCM4P2_CheckVLCEscapeMode( 191 storeRun, 192 storeRunPlus, 193 storeLevel, 194 storeLevelPlus, 195 maxStoreRunL1, 196 maxRunForMultipleEntriesL1, 197 shortVideoHeader, 198 pRunIndexTableL1); 199 200 armVCM4P2_FillVLCBuffer ( 201 ppBitStream, 202 pBitOffset, 203 storeRun, 204 storeLevel, 205 storeRunPlus, 206 storeLevelPlus, 207 fMode, 208 last, 209 maxRunForMultipleEntriesL1, 210 pRunIndexTableL1, 211 pVlcTableL1); 212 return OMX_Sts_NoErr; 213 } 214 215 /* End of File */ 216
