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1 /* |
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2 * Copyright (c) 2005-2006 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 "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: Encoder implementation capable to form redundancy RTP payload. |
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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 |
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21 |
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22 // INCLUDE FILES |
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23 #include "mccredencoder.h" |
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24 #include "streamformatter.h" |
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25 #include "mccredpayloadformatdefs.h" |
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26 #include "mccdef.h" |
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27 |
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28 // CONSTANTS |
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29 const TUint KPrimaryEncPTInd = 0; |
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30 |
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31 // ============================= LOCAL FUNCTIONS =============================== |
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32 |
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33 |
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34 // ============================ MEMBER FUNCTIONS =============================== |
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35 |
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36 // ----------------------------------------------------------------------------- |
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37 // CMccRedEncoder::CMccRedEncoder |
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38 // C++ default constructor can NOT contain any code, that |
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39 // might leave. |
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40 // ----------------------------------------------------------------------------- |
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41 // |
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42 CMccRedEncoder::CMccRedEncoder() |
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43 { |
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44 DP_RED_ENCODE( "CMccRedEncoder::CMccRedEncoder" ) |
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45 } |
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46 |
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47 // ----------------------------------------------------------------------------- |
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48 // CMccRedEncoder::ConstructL |
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49 // Symbian 2nd phase constructor can leave. |
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50 // ----------------------------------------------------------------------------- |
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51 // |
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52 void CMccRedEncoder::ConstructL() |
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53 { |
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54 DP_RED_ENCODE( "CMccRedEncoder::ConstructL" ) |
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55 |
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56 iRedHeaders |
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57 = HBufC8::NewL( KDefRedCount * KRedHeaderSize + KFinalHeaderSize ); |
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58 } |
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59 |
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60 // ----------------------------------------------------------------------------- |
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61 // CMccRedEncoder::NewL |
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62 // Two-phased constructor. |
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63 // ----------------------------------------------------------------------------- |
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64 // |
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65 CMccRedEncoder* CMccRedEncoder::NewL() |
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66 { |
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67 DP_RED_ENCODE( "CMccRedEncoder::NewL" ) |
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68 |
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69 CMccRedEncoder* self = new( ELeave ) CMccRedEncoder; |
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70 |
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71 CleanupStack::PushL( self ); |
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72 self->ConstructL(); |
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73 CleanupStack::Pop( self ); |
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74 |
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75 return self; |
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76 } |
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77 |
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78 |
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79 // Destructor |
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80 CMccRedEncoder::~CMccRedEncoder() |
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81 { |
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82 DP_RED_ENCODE( "CMccRedEncoder::~CMccRedEncoder" ) |
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83 |
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84 iRedTimeStamps.Close(); |
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85 delete iRedHeaders; |
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86 delete iRedPayload; |
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87 } |
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88 |
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89 |
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90 // ----------------------------------------------------------------------------- |
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91 // CMCCRedEncoder::DoInitializeL |
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92 // Initialize encoder after encoding parameters are changed or encoding is |
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93 // started again after pause. |
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94 // ----------------------------------------------------------------------------- |
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95 // |
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96 void CMccRedEncoder::DoInitializeL( TInt aRedBlockCount, TInt aMaxPayloadSize, |
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97 TInt /*aNumOfEncodings*/ ) |
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98 { |
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99 DP_RED_ENCODE( "CMccRedEncoder::DoInitializeL" ) |
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100 |
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101 if ( KMaxRedCount < aRedBlockCount || 0 > aRedBlockCount ) |
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102 { |
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103 User::Leave( KErrArgument ); |
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104 } |
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105 |
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106 if ( KDefRedCount != aRedBlockCount ) |
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107 { |
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108 delete iRedHeaders; |
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109 iRedHeaders = NULL; |
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110 iRedHeaders = HBufC8::NewL( |
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111 aRedBlockCount * KRedHeaderSize + KFinalHeaderSize ); |
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112 } |
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113 |
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114 // Memory for redundant payloads without redundancy headers |
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115 TInt redPayloadSize( aRedBlockCount * aMaxPayloadSize ); |
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116 if ( iRedPayload ) |
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117 { |
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118 if ( iRedPayload->Data().MaxSize() < redPayloadSize ) |
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119 { |
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120 delete iRedPayload; |
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121 iRedPayload = NULL; |
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122 iRedPayload = CMMFDataBuffer::NewL( redPayloadSize ); |
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123 } |
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124 } |
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125 else |
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126 { |
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127 iRedPayload = CMMFDataBuffer::NewL( redPayloadSize ); |
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128 } |
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129 |
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130 iRedPackets = EFalse; |
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131 iRedTimeStamps.Reset(); |
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132 iRedHeaders->Des().Zero(); |
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133 } |
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134 |
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135 |
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136 // ----------------------------------------------------------------------------- |
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137 // CMccRedEncoder::EncodePayloadL |
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138 // Encode payloads set with SetEncoding() -method. |
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139 // ----------------------------------------------------------------------------- |
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140 // |
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141 void CMccRedEncoder::EncodePayloadL( TUint aCurTimeStamp ) |
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142 { |
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143 DP_RED_ENCODE( "CMccRedEncoder::EncodePayload" ) |
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144 __ASSERT_ALWAYS( iRTPPayload, User::Leave( KErrNotReady ) ); |
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145 |
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146 TDes8& rtpPayload = iRTPPayload->Data(); |
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147 rtpPayload.Zero(); |
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148 |
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149 // Copy redundant payload if exist |
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150 if ( iRedPackets ) |
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151 { |
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152 rtpPayload.Append( iRedPayload->Data() ); |
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153 } |
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154 |
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155 // Append new payload to the end of redundancy RTP payload |
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156 rtpPayload.Append( iEncodings[EMccPrimaryEncoding]->Data() ); |
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157 iRedTimeStamps.AppendL( aCurTimeStamp ); |
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158 |
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159 ConstructRedHeaders( aCurTimeStamp ); |
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160 rtpPayload.Insert( 0, *iRedHeaders ); |
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161 |
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162 // Save redundant data block |
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163 iRedPayload->Data().Copy( iEncodings[EMccPrimaryEncoding]->Data() ); |
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164 iRedPackets = ETrue; |
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165 } |
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166 |
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167 |
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168 // ----------------------------------------------------------------------------- |
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169 // CMccRedEncoder::ConstructRedHeaders |
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170 // Construct redundancy headers. |
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171 // ----------------------------------------------------------------------------- |
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172 // |
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173 void CMccRedEncoder::ConstructRedHeaders( TUint aCurTimeStamp ) |
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174 { |
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175 DP_RED_ENCODE( "CMccRedEncoder::ConstructRedHeaders" ) |
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176 |
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177 // Construct redundancy headers, final header is one byte long |
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178 iRedHeaders->Des().Zero(); |
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179 const TUint8* seekPtr = iRedHeaders->Ptr(); |
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180 |
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181 TStreamEncoder streamEncoder; |
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182 streamEncoder.Initialize( const_cast<TUint8*>( seekPtr ), 0, 0 ); |
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183 |
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184 // Encode headers except final header |
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185 if ( 1 < iRedTimeStamps.Count() ) |
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186 { |
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187 iRedHeaders->Des().SetLength( |
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188 iRedBlockCount * KRedHeaderSize + KFinalHeaderSize ); |
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189 |
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190 for ( TInt i = 0; i < iRedBlockCount; i++ ) |
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191 { |
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192 // F-bit |
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193 streamEncoder.Encode( 1, KFBitLength ); |
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194 // PT |
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195 streamEncoder.Encode( iPayloadTypes[KPrimaryEncPTInd], KPTFieldBits ); |
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196 // Calculate timestamp offset |
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197 TUint offset = aCurTimeStamp - iRedTimeStamps[i]; |
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198 // Timestamp offset |
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199 streamEncoder.Encode( offset, KTSOffsetBits ); |
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200 // Block length |
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201 streamEncoder.Encode( iRedPayload->Data().Length(), KBlockLengthBits ); |
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202 |
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203 DP_RED_ENCODE6( "ENC RED_HEADER NUM %d: F:%d PT:%d TIMESTAMP:%d, BL:%d", |
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204 i, ETrue, iPayloadTypes[KPrimaryEncPTInd], iRedTimeStamps[i], |
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205 iRedPayload->Data().Length() ) |
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206 } |
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207 } |
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208 else |
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209 { |
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210 iRedHeaders->Des().SetLength( KFinalHeaderSize ); |
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211 } |
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212 |
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213 // Encode final header |
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214 streamEncoder.Encode( 0, KFinalHeaderSize ); |
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215 streamEncoder.Encode( iPayloadTypes[KPrimaryEncPTInd], KPTFieldBits ); |
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216 |
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217 DP_RED_ENCODE5( "ENC FINAL RED_HEADER %d: F:%d PT:%d #TIMESTAMP#:%d", |
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218 iRedBlockCount, 0, iPayloadTypes[KPrimaryEncPTInd], aCurTimeStamp ) |
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219 |
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220 // Delete oldest time stamp |
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221 if ( iRedTimeStamps.Count() > iRedBlockCount ) |
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222 { |
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223 iRedTimeStamps.Remove( 0 ); |
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224 } |
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225 } |
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226 |
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227 |
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228 // ========================== OTHER EXPORTED FUNCTIONS ========================= |
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229 |
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230 |
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231 // End of File |