1 /* ------------------------------------------------------------------ 2 * Copyright (C) 1998-2009 PacketVideo 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 13 * express or implied. 14 * See the License for the specific language governing permissions 15 * and limitations under the License. 16 * ------------------------------------------------------------------- 17 */ 18 #include "h223_api.h" 19 #include "h223.h" 20 const uint gMuxStuffingSz[] = {1, 2, 4, 5, 6, 0}; 21 const uint gMuxFlagSz[] = {1, 2, 4, 2, 2, 0}; 22 const uint gMaxStuffingSz[] = {3, 3, 5, 5, 6, 0}; 23 const uint8 gNumOnes[] = {0, 1, 1, 2, 1, 2, 2, 3, // 0 24 1, 2, 2, 3, 2, 3, 3, 4, // 8 25 1, 2, 2, 3, 2, 3, 3, 4, // 16 26 2, 3, 3, 4, 3, 4, 4, 5, // 24 27 1, 2, 2, 3, 2, 3, 3, 4, // 32 28 2, 3, 3, 4, 3, 4, 4, 5, // 40 29 2, 3, 3, 4, 3, 4, 4, 5, // 48 30 3, 4, 4, 5, 4, 5, 5, 6, // 56 31 1, 2, 2, 3, 2, 3, 3, 4, // 64 32 2, 3, 3, 4, 3, 4, 4, 5, // 72 33 2, 3, 3, 4, 3, 4, 4, 5, // 80 34 3, 4, 4, 5, 4, 5, 5, 6, // 88 35 2, 3, 3, 4, 3, 4, 4, 5, // 96 36 3, 4, 4, 5, 4, 5, 5, 6, // 104 37 3, 4, 4, 5, 4, 5, 5, 6, // 112 38 4, 5, 5, 6, 5, 6, 6, 7, // 120 39 1, 2, 2, 3, 2, 3, 3, 4, // 128 40 2, 3, 3, 4, 3, 4, 4, 5, // 136 41 2, 3, 3, 4, 3, 4, 4, 5, // 144 42 3, 4, 4, 5, 4, 5, 5, 6, // 152 43 2, 3, 3, 4, 3, 4, 4, 5, // 160 44 3, 4, 4, 5, 4, 5, 5, 6, // 168 45 3, 4, 4, 5, 4, 5, 5, 6, // 176 46 4, 5, 5, 6, 5, 6, 6, 7, // 184 47 2, 3, 3, 4, 3, 4, 4, 5, // 192 48 3, 4, 4, 5, 4, 5, 5, 6, // 200 49 3, 4, 4, 5, 4, 5, 5, 6, // 208 50 4, 5, 5, 6, 5, 6, 6, 7, // 216 51 3, 4, 4, 5, 4, 5, 5, 6, // 224 52 4, 5, 5, 6, 5, 6, 6, 7, // 232 53 4, 5, 5, 6, 5, 6, 6, 7, // 240 54 5, 6, 6, 7, 6, 7, 7, 8 55 }; // 248 56 57 /* Delete this */ 58 OSCL_EXPORT_REF CPVH223Multiplex* AllocateH223Mux(TPVLoopbackMode aLoopbackMode) 59 { 60 return OSCL_NEW(CPVH223Multiplex, (aLoopbackMode)); 61 } 62 63 OSCL_EXPORT_REF void DeallocateH223Mux(CPVH223Multiplex* h223mux) 64 { 65 OSCL_DELETE(h223mux); 66 } 67 68 uint H223GetMuxStuffingSz(TPVH223Level flat_level) 69 { 70 return gMuxStuffingSz[flat_level]; 71 } 72 73 uint H223GetMuxFlagSz(TPVH223Level flat_level) 74 { 75 return gMuxFlagSz[flat_level]; 76 } 77 78 uint H223GetMaxStuffingSz(TPVH223Level flat_level) 79 { 80 return gMaxStuffingSz[flat_level]; 81 } 82 83 uint H223MuxStuffing(TPVH223Level level, uint8* pPdu, uint bufSz) 84 { 85 int32 stuffing_size = (int32)H223GetMuxStuffingSz(level); 86 if (stuffing_size == 0) 87 return 0; 88 89 int32 size_left = bufSz; 90 while (size_left >= stuffing_size) 91 { 92 switch (level) 93 { 94 case H223_LEVEL0: // level 0 95 *(pPdu) = 0x7e; 96 break; 97 case H223_LEVEL1: // level 1 98 case H223_LEVEL1_DF: // H223DoubleFlag == TRUE 99 *(pPdu) = 0xe1; 100 *(pPdu + 1) = 0x4d; 101 if (level == H223_LEVEL1) 102 break; 103 *(pPdu + 2) = 0xe1; 104 *(pPdu + 3) = 0x4d; 105 break; 106 case H223_LEVEL2: // level 2 107 case H223_LEVEL2_OH: // H223OptionalHeader==1 108 *(pPdu) = 0xe1; 109 *(pPdu + 1) = 0x4d; 110 *(pPdu + 2) = 0; 111 *(pPdu + 3) = 0; 112 *(pPdu + 4) = 0; 113 if (level == H223_LEVEL2) 114 break; 115 *(pPdu + 5) = 0; 116 break; 117 default: 118 return 0; 119 } 120 pPdu += stuffing_size; 121 size_left -= stuffing_size; 122 } 123 return (bufSz - size_left); 124 } 125 126 bool H223CheckSync(TPVH223Level level, uint8* buf, uint bufSz, uint tolerance) 127 { 128 if (bufSz < H223GetMuxFlagSz(level)) 129 return false; 130 uint mismatch_cnt = 0; 131 switch (level) 132 { 133 case H223_LEVEL0: 134 mismatch_cnt = gNumOnes[(buf[0] ^ 0x7E)]; 135 break; 136 case H223_LEVEL1: 137 case H223_LEVEL1_DF: 138 mismatch_cnt = (uint16)(gNumOnes[(buf[0] ^ 0xE1)] + gNumOnes[(buf[1] ^ 0x4D)]); 139 if (level == H223_LEVEL1) 140 break; 141 mismatch_cnt += (uint16)(gNumOnes[(buf[2] ^ 0xE1)] + gNumOnes[(buf[3] ^ 0x4D)]); 142 break; 143 case H223_LEVEL2_OH: 144 if (bufSz >= 6) 145 mismatch_cnt = (uint16)(gNumOnes[buf[5]]); 146 case H223_LEVEL2: 147 mismatch_cnt += (uint16)(gNumOnes[(buf[0] ^ 0xE1)] + gNumOnes[(buf[1] ^ 0x4D)]); 148 if (bufSz >= 5) 149 { 150 mismatch_cnt += (uint16)(gNumOnes[buf[2]]); 151 mismatch_cnt += (uint16)(gNumOnes[buf[3]]); 152 mismatch_cnt += (uint16)(gNumOnes[buf[4]]); 153 } 154 break; 155 default: 156 return false; 157 } 158 return (mismatch_cnt <= tolerance); 159 } 160
