author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 01:04:58 +0200 | |
changeset 0 | 1bce908db942 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2005-2006 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: Decoder capable to handle redundancy RTP payload. |
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* |
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*/ |
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// INCLUDE FILES |
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#include "mccreddecoder.h" |
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#include "streamformatter.h" |
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#include "mccredpayloadformatdefs.h" |
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#include "mccdef.h" |
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const TInt KNumValue3 = 3; |
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const TInt KNumValue4 = 4; |
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// ============================= LOCAL FUNCTIONS =============================== |
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// ============================ MEMBER FUNCTIONS =============================== |
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// ----------------------------------------------------------------------------- |
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// CMccRedDecoder::CMccRedDecoder |
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// C++ default constructor can NOT contain any code, that |
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// might leave. |
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// ----------------------------------------------------------------------------- |
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// |
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CMccRedDecoder::CMccRedDecoder() |
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{ |
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DP_RED_DECODE( "CMccRedDecoder::CMccRedDecoder" ) |
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} |
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// ----------------------------------------------------------------------------- |
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// CMccRedDecoder::NewL |
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// Two-phased constructor. |
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// ----------------------------------------------------------------------------- |
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// |
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CMccRedDecoder* CMccRedDecoder::NewL() |
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{ |
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DP_RED_DECODE( "CMccRedDecoder::NewL" ) |
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CMccRedDecoder* self = new( ELeave ) CMccRedDecoder; |
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return self; |
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} |
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// Destructor |
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CMccRedDecoder::~CMccRedDecoder() |
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{ |
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DP_RED_DECODE( "CMccRedDecoder::~CMccRedDecoder" ) |
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iRedHeaderInfo.Close(); |
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} |
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// ----------------------------------------------------------------------------- |
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// CMCCRedDecoder::DoInitializeL |
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// Initialize decoder after encoding parameters are changed or decoding is |
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// started again after a pause. |
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// ----------------------------------------------------------------------------- |
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// |
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void CMccRedDecoder::DoInitializeL( TInt aRedBlockCount, |
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TInt /*aMaxPayloadSize*/, |
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TInt /*aNumOfEncodings*/ ) |
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{ |
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DP_RED_DECODE( "CMccRedDecoder::DoInitializeL" ) |
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if ( KMaxRedCount >= aRedBlockCount ) |
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{ |
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iRedBlockCount = aRedBlockCount; |
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iCurTimeStamp = 0; |
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iLatestTimeStamp = -1; |
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} |
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else |
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{ |
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User::Leave( KErrArgument ); |
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} |
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} |
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// ----------------------------------------------------------------------------- |
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// CMccRedDecoder::DecodePayload |
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// Decode encoding(s) from RTP payload given. |
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// ----------------------------------------------------------------------------- |
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// |
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TInt CMccRedDecoder::DecodePayload( TUint aCurTimeStamp ) |
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{ |
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DP_RED_DECODE( "CMccRedDecoder::DecodePayload" ) |
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iCurTimeStamp = aCurTimeStamp; |
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iRedHeaderInfo.Reset(); |
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iEncodings[EMccPrimaryEncoding]->Data().Zero(); |
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TInt error = GetBlockInfos( iRedHeaderInfo, iRTPPayload->Data() ); |
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if ( KErrNone == error ) |
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{ |
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// Ignore already received blocks |
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107 |
while ( iRedHeaderInfo.Count() |
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108 |
&& static_cast<TInt>( iRedHeaderInfo[0].iTimeStamp ) <= iLatestTimeStamp ) |
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109 |
{ |
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DP_RED_ENCODE2( "BLOCK with TIMESTAMP %d REMOVED", |
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111 |
iRedHeaderInfo[0].iTimeStamp ) |
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112 |
iRedHeaderInfo.Remove( 0 ); |
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113 |
} |
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114 |
|
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115 |
// Separate encodings |
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for ( TInt i = 0; i < iRedHeaderInfo.Count(); i++ ) |
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117 |
{ |
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118 |
if ( iRedHeaderInfo[i].iBlockPT |
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== iPayloadTypes[EMccPrimaryEncoding] ) |
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120 |
{ |
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TDes8& primaryEnc = iEncodings[EMccPrimaryEncoding]->Data(); |
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primaryEnc.Append( iRedHeaderInfo[i].iBlockIndex, |
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iRedHeaderInfo[i].iBlockLength ); |
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124 |
} |
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else if ( iRedHeaderInfo[i].iBlockPT |
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== iPayloadTypes[EMccSecondaryEncoding] ) |
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127 |
{ |
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TDes8& secondaryEnc = iEncodings[EMccSecondaryEncoding]->Data(); |
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secondaryEnc.Append( iRedHeaderInfo[i].iBlockIndex, |
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iRedHeaderInfo[i].iBlockLength ); |
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131 |
} |
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else if ( iRedHeaderInfo[i].iBlockPT == KComfortNoisePT ) |
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133 |
{ |
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134 |
DP_RED_DECODE( "CMccRedDecoder::DecodePayload() - CN" ) |
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TDes8& primaryEnc = iEncodings[EMccPrimaryEncoding]->Data(); |
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136 |
primaryEnc.Append( iRedHeaderInfo[i].iBlockIndex, |
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137 |
iRedHeaderInfo[i].iBlockLength ); |
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138 |
} |
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139 |
else |
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140 |
{ |
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141 |
DP_RED_ENCODE( "NOT SUPPORTED ENCODING, SKIPPED" ) |
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142 |
} |
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143 |
} |
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144 |
|
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145 |
iLatestTimeStamp = aCurTimeStamp; |
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146 |
return iRedHeaderInfo.Count(); |
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147 |
} |
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148 |
else |
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149 |
{ |
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150 |
DP_RED_DECODE( "CMccRedDecoder::DecodePayload() - \ |
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151 |
ERROR with GetBlockInfos" ) |
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152 |
|
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153 |
iEncodings[EMccPrimaryEncoding]->Data().Zero(); |
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return error; |
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155 |
} |
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156 |
} |
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157 |
|
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158 |
|
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159 |
// ----------------------------------------------------------------------------- |
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160 |
// CMccRedDecoder::GetBlockInfos |
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161 |
// Get block indexes. Redundant blocks are ignored based on timestamp. |
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// Timestamp of the primary data block is saved. Data validity is verified by |
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163 |
// checking that decoded block indexes are inside bounds and overall length of |
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164 |
// decoded data blocks is not greater than RPT payload length. Time stamps |
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165 |
// are also checked that they are in increasing order. |
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166 |
// ----------------------------------------------------------------------------- |
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167 |
// |
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168 |
TInt CMccRedDecoder::GetBlockInfos( RArray<TRedHeaderInfo>& aBlockInfos, |
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169 |
const TDesC8& aRTPPayload ) |
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170 |
{ |
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171 |
DP_RED_DECODE( "CMccRedDecoder::GetBlockInfos" ) |
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172 |
|
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if ( 0 == aRTPPayload.Size() ) |
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174 |
{ |
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175 |
return KErrArgument; |
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176 |
} |
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177 |
|
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178 |
const TUint8* seekPtr = aRTPPayload.Ptr(); |
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179 |
|
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180 |
TStreamDecoder streamDecoder; |
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181 |
streamDecoder.Initialize( const_cast<TUint8*>( seekPtr ), 0, 0 ); |
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182 |
|
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183 |
TBool FBitSet( ETrue ); |
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184 |
TInt allBlockLength(0); // For data validity check |
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185 |
|
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186 |
// Go through redundancy headers and count audio frame blocks |
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187 |
// Determine number of redundant frame blocks to ignore based on timestamp |
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188 |
TUint frameBlockCount(0); |
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189 |
|
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190 |
while ( FBitSet ) |
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191 |
{ |
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192 |
frameBlockCount++; |
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193 |
TRedHeaderInfo curInfo; |
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194 |
|
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195 |
FBitSet = static_cast<TBool>( streamDecoder.Decode( KFBitLength ) ); |
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196 |
curInfo.iBlockPT = static_cast<TUint8>( streamDecoder.Decode( KPTFieldBits ) ); |
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197 |
|
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198 |
if ( FBitSet ) |
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199 |
{ |
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200 |
TUint offset = streamDecoder.Decode( KTSOffsetBits ); |
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201 |
curInfo.iTimeStamp = iCurTimeStamp - offset; |
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202 |
curInfo.iBlockLength = streamDecoder.Decode( KBlockLengthBits ); |
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203 |
|
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204 |
allBlockLength += curInfo.iBlockLength; |
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205 |
|
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206 |
DP_RED_DECODE6( "DEC RED_HEADER NUM %d: F:%d PT:%d \ |
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207 |
TIMESTAMP:%d, BL:%d", frameBlockCount, ETrue, curInfo.iBlockPT, |
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208 |
curInfo.iTimeStamp, curInfo.iBlockLength ) |
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209 |
|
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210 |
// Jump to the beginning of next redundancy header |
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streamDecoder.Initialize( const_cast<TUint8*>( seekPtr ), |
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frameBlockCount * KNumValue4, 0 ); |
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} |
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else |
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{ |
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// Primary data block's time stamp |
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curInfo.iTimeStamp = iCurTimeStamp; |
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DP_RED_DECODE5( "DEC FINAL RED_HEADER %d: F:%d PT:%d \ |
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#TIMESTAMP#:%d", frameBlockCount, 0, curInfo.iBlockPT, |
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curInfo.iTimeStamp ) |
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} |
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222 |
|
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TInt err = aBlockInfos.Append( curInfo ); |
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if ( err ) |
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{ |
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return err; |
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} |
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} |
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229 |
|
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// Calculate frame block indexes |
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frameBlockCount = aBlockInfos.Count(); |
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TUint8* firstBlockIndex = ( const_cast<TUint8*>( seekPtr ) |
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+ frameBlockCount * KRedHeaderSize - KNumValue3 ); |
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aBlockInfos[0].iBlockIndex = firstBlockIndex; |
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|
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for( TUint i = 1; i < frameBlockCount; i++ ) |
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{ |
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aBlockInfos[i].iBlockIndex |
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= firstBlockIndex + aBlockInfos[i - 1].iBlockLength; |
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} |
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|
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// Length of the last block |
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const TUint8* endPtr = aRTPPayload.Ptr() + aRTPPayload.Length(); |
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TInt lastIndex( aBlockInfos.Count() - 1 ); |
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aBlockInfos[lastIndex].iBlockLength = |
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endPtr - aBlockInfos[lastIndex].iBlockIndex; |
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|
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allBlockLength += aBlockInfos[lastIndex].iBlockLength; |
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|
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// Check data validity |
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for ( TUint i = 0; i < frameBlockCount - 1; i++ ) |
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{ |
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// Check time stamps contiguousness |
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if ( aBlockInfos[i].iTimeStamp > aBlockInfos[i+1].iTimeStamp ) |
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{ |
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return KErrCorrupt; |
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} |
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|
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// Check index bounds |
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if ( aBlockInfos[i].iBlockIndex < firstBlockIndex |
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|| aBlockInfos[i].iBlockIndex > endPtr ) |
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{ |
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return KErrCorrupt; |
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} |
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|
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TUint plLen = static_cast<TUint>( aRTPPayload.Length() ); |
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if ( aBlockInfos[i].iBlockLength < 1 || aBlockInfos[i+1].iBlockLength < 1 |
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|| plLen < aBlockInfos[i].iBlockLength ) |
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{ |
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return KErrCorrupt; |
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} |
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} |
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|
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// Check overall block lengths |
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if ( aRTPPayload.Length() < allBlockLength || 0 > allBlockLength ) |
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{ |
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return KErrCorrupt; |
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} |
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else |
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{ |
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return KErrNone; |
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} |
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} |
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|
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// ========================== OTHER EXPORTED FUNCTIONS ========================= |
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|
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// End of File |