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1 /* |
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2 * Copyright (c) 2007 Nokia Corporation and/or its subsidiary(-ies). |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of the License "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - initial contribution. |
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11 * |
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12 * Contributors: |
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13 * |
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14 * Description: Class to RTP packet parsing.* |
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15 */ |
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16 |
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17 |
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18 |
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19 |
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20 // INCLUDE FILES |
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21 #include "CRtpPacket.h" |
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22 |
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23 // CONSTANTS |
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24 const TInt KRtpPacketVersion( 2 ); |
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25 const TInt KRtpMinHeaderLength( 12 ); |
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26 |
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27 // ============================ MEMBER FUNCTIONS =============================== |
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28 |
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29 // ----------------------------------------------------------------------------- |
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30 // CRtpPacket::NewL |
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31 // Two-phased constructor. |
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32 // ----------------------------------------------------------------------------- |
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33 // |
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34 EXPORT_C CRtpPacket* CRtpPacket::NewL() |
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35 { |
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36 CRtpPacket* self = CRtpPacket::NewLC(); |
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37 CleanupStack::Pop(); |
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38 return self; |
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39 } |
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40 |
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41 // ----------------------------------------------------------------------------- |
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42 // CRtpPacket::NewLC |
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43 // Two-phased constructor. |
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44 // ----------------------------------------------------------------------------- |
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45 // |
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46 EXPORT_C CRtpPacket* CRtpPacket::NewLC() |
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47 { |
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48 CRtpPacket* self = new( ELeave ) CRtpPacket(); |
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49 CleanupStack::PushL( self ); |
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50 self->ConstructL(); |
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51 return self; |
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52 } |
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53 |
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54 // ----------------------------------------------------------------------------- |
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55 // CRtpPacket::CRtpPacket |
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56 // C++ default constructor can NOT contain any code, that might leave. |
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57 // ----------------------------------------------------------------------------- |
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58 // |
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59 CRtpPacket::CRtpPacket() : iPayload( NULL, 0 ) |
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60 { |
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61 // None |
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62 } |
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63 |
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64 // ----------------------------------------------------------------------------- |
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65 // CRtpPacket::ConstructL |
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66 // Symbian 2nd phase constructor can leave. |
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67 // ----------------------------------------------------------------------------- |
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68 // |
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69 void CRtpPacket::ConstructL() |
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70 { |
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71 // None |
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72 } |
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73 |
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74 // ----------------------------------------------------------------------------- |
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75 // CRtpPacket::CRtpPacket |
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76 // Destructor. |
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77 // ----------------------------------------------------------------------------- |
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78 // |
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79 EXPORT_C CRtpPacket::~CRtpPacket() |
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80 { |
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81 if ( iRtpRecvHeader.iHeaderExtension ) |
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82 { |
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83 // Remove iData |
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84 delete[] ( iRtpRecvHeader.iHeaderExtension )->iData; |
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85 delete iRtpRecvHeader.iHeaderExtension; |
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86 } |
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87 |
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88 if ( iRtpRecvHeader.iCsrcList ) |
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89 { |
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90 delete[] iRtpRecvHeader.iCsrcList; |
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91 } |
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92 } |
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93 |
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94 // ----------------------------------------------------------------------------- |
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95 // CRtpPacket::ParseRtcp |
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96 // |
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97 // ----------------------------------------------------------------------------- |
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98 // |
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99 EXPORT_C TInt CRtpPacket::ParseRtp( const TDesC8& aPktBuf ) |
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100 { |
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101 if ( aPktBuf.Length() < KRtpMinHeaderLength ) |
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102 { |
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103 SetTimeStamp( 0 ); |
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104 iPayload.Set( NULL, 0 ); |
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105 return KErrUnderflow; |
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106 } |
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107 |
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108 // 1st byte |
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109 TInt byte( 0 ); |
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110 TUint8 version_flag( ( aPktBuf[byte] & 0xc0 ) >> 6 ); |
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111 // v=2 is mandatory |
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112 if ( version_flag != KRtpPacketVersion ) |
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113 { |
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114 SetTimeStamp( 0 ); |
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115 iPayload.Set( NULL, 0 ); |
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116 return KErrNotSupported; |
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117 } |
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118 |
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119 iRtpRecvHeader.iPadding = ( aPktBuf[byte] >> 5 ) & 1; |
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120 iRtpRecvHeader.iExtension = ( aPktBuf[byte] >> 4 ) & 1; |
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121 iRtpRecvHeader.iCsrcCount = aPktBuf[byte++] & 0xf; |
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122 |
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123 // 2nd byte |
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124 iRtpRecvHeader.iMarker = ( aPktBuf[byte] >> 7 ) & 1; |
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125 iRtpRecvHeader.iPayloadType = aPktBuf[byte++] & 0x7f; |
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126 |
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127 // 3rd - 4th bytes |
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128 TUint16 seq_no( aPktBuf[byte++] << 8 ); |
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129 seq_no |= aPktBuf[byte++]; |
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130 iRtpRecvHeader.iSeqNum = seq_no; |
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131 |
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132 // 5th - 8th bytes |
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133 TUint32 timestamp( Read32Bits( aPktBuf, byte ) ); |
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134 iRtpRecvHeader.iTimestamp = timestamp; |
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135 |
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136 // 9th - 12th bytes |
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137 TInt32 ssrc( Read32Bits( aPktBuf, byte ) ); |
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138 |
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139 // 13th - bytes (optional) |
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140 // total len = 4 * csrc_len (bytes) |
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141 if ( iRtpRecvHeader.iCsrcCount > 0 ) |
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142 { |
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143 iRtpRecvHeader.iCsrcList = new TUint32[iRtpRecvHeader.iCsrcCount]; |
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144 //TInt32* csrc = new TInt32[csrc_len]; |
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145 for ( TInt i( 0 ); i < iRtpRecvHeader.iCsrcCount; i++ ) |
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146 { |
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147 iRtpRecvHeader.iCsrcList[i] = Read32Bits( aPktBuf, byte ); |
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148 } |
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149 } |
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150 |
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151 // optional extension field |
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152 if ( iRtpRecvHeader.iExtension == 1 ) |
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153 { |
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154 /* |
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155 iRtpRecvHeader.iHeaderExtension = new TRtpHeaderExtension(); |
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156 // 16 bits |
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157 TInt16 op_code( aPktBuf[byte++] << 8 ); |
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158 op_code |= aPktBuf[byte++]; |
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159 iRtpRecvHeader.iHeaderExtension->iType = op_code; |
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160 |
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161 // 16 bits |
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162 TInt16 op_code_data_length = aPktBuf[byte++] << 8; |
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163 op_code_data_length |= aPktBuf[byte++]; |
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164 iRtpRecvHeader.iHeaderExtension->iLength = op_code_data_length; |
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165 |
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166 op_code_data_length * 4 bytes of extension data |
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167 op_code_data = new TInt32[op_code_data_length]; |
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168 iRtpRecvHeader.iHeaderExtension->iData = new TInt32[op_code_data_length]; |
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169 for ( TInt i( 0 ); i < op_code_data_length; i++ ) |
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170 { |
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171 iRtpRecvHeader.iHeaderExtension)->iData[i] = Read32Bits( aPktBuf, byte ); |
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172 } |
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173 */ |
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174 } |
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175 |
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176 // The rest is payload data |
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177 iPayload.Set( aPktBuf.Mid( byte ) ); |
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178 |
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179 return KErrNone; |
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180 } |
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181 |
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182 // ----------------------------------------------------------------------------- |
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183 // CRtpPacket::SetTimeStamp |
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184 // |
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185 // ----------------------------------------------------------------------------- |
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186 // |
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187 EXPORT_C void CRtpPacket::SetTimeStamp( const TUint32 aTs ) |
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188 { |
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189 iRtpRecvHeader.iTimestamp = aTs; |
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190 } |
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191 |
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192 // ----------------------------------------------------------------------------- |
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193 // CRtpPacket::Read32Bits |
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194 // |
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195 // ----------------------------------------------------------------------------- |
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196 // |
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197 TUint CRtpPacket::Read32Bits( const TPtrC8& aPktBuf, TInt& aByte ) |
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198 { |
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199 TUint ret( ( ( TUint )( aPktBuf[aByte++] ) ) << 24 ); |
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200 ret |= ( ( TUint )( aPktBuf[aByte++] ) ) << 16; |
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201 ret |= ( ( TUint )( aPktBuf[aByte++] ) ) << 8; |
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202 ret |= ( ( TUint )( aPktBuf[aByte++] ) ); |
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203 |
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204 return ret; |
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205 } |
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206 |
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207 // End of File |