author | hgs |
Wed, 28 Jul 2010 17:16:27 +0300 | |
changeset 38 | adb732539d68 |
parent 0 | 1bce908db942 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2005 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: AVC De-Payloadization class |
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* |
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*/ |
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// ============================ INCLUDES ======================================= |
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#include"rfc3984decode.h" |
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// ============================ MEMBER FUNCTIONS =============================== |
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_LIT8(AVCPSC1, "\x0\x0\x0\x1"); |
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// ----------------------------------------------------------------------------- |
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// CRFC3984Decode::CRFC3984Decode() |
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// Default Constructor |
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// (other items were commented in a header). |
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// ----------------------------------------------------------------------------- |
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// |
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CRFC3984Decode::CRFC3984Decode() |
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{ |
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iNalCount = 0; |
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iVirtualDON = 0; |
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} |
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// ----------------------------------------------------------------------------- |
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// CRFC3984Decode::~CRFC3984Decode() |
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// Default Destructor |
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// (other items were commented in a header). |
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// ----------------------------------------------------------------------------- |
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// |
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CRFC3984Decode::~CRFC3984Decode() |
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{ |
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// TODO :: cleanup iBuffer in this destructor |
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} |
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// ----------------------------------------------------------------------------- |
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// CRFC3984Decode::NewL() |
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// First stage constructor |
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// (other items were commented in a header). |
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// ----------------------------------------------------------------------------- |
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// |
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CRFC3984Decode * CRFC3984Decode::NewL() |
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{ |
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CRFC3984Decode * self = new(ELeave) CRFC3984Decode; |
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CleanupStack::PushL( self ); |
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self->ConstructL( ); |
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CleanupStack::Pop(); |
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return self; |
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} |
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// ----------------------------------------------------------------------------- |
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// CRFC3984Decode::ConstructL() |
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// Initializing common members |
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// ----------------------------------------------------------------------------- |
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// |
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void CRFC3984Decode::ConstructL() |
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{ |
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iNalCount = 0; |
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iVirtualDON = 0; |
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} |
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// ----------------------------------------------------------------------------- |
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// CRFC3984Decode::DePayloadizeFrame() |
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// Purpose : This function receives the encoded frame and payloadizes it based on the packetization_mode value |
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// Parameters : aBuffer - Buffer containing the received NAL unit |
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// aTimeStamp - Timestamp to go into RTP |
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// aMarkerBit - Marker Bit indication (this function sets it for key frames) |
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// aNalCount - Returns the NAL count through this reference |
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// Return Value: ETrue if correct parsing done, EFalse if an error occured |
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// ----------------------------------------------------------------------------- |
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// |
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TBool CRFC3984Decode::DePayloadizeFrameL(TDes8 & aBuffer, TUint aTimeStamp, TUint aArrivalTime, TUint16 aSeqNo, TUint8 & aMarkerBit, TInt & aNalCount) |
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{ |
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TInt index = 0; |
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CAvcRtpStruct * pRtpStruct = NULL; |
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HBufC8 * pBuffer = NULL; |
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TInt16 lowerSeqNo = aSeqNo; |
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TUint8 header = aBuffer[index]; |
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TUint8 type = header & 0x1f; |
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if(type <= PACKET_NAL_UNIT){ // SNALU packet -- add as they are |
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// storing reference as it is |
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pRtpStruct = new (ELeave) CAvcRtpStruct; // allocating memory to store RTP header information and data pointer |
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106 |
pRtpStruct->iMarkerBit = aMarkerBit; |
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107 |
pRtpStruct->iArrivalTime = aArrivalTime; |
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108 |
pRtpStruct->iTimeStamp = aTimeStamp; |
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109 |
pRtpStruct->iSeqNo = aSeqNo; |
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110 |
pRtpStruct->iPacketType = type; |
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111 |
pRtpStruct->iDon = (iVirtualDON++)%65535; // Since 1 NAL/slice, no need for virtual DON and keeping it constant. |
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112 |
|
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113 |
CleanupStack::PushL( pRtpStruct ); // pushing to stack for leave operation |
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114 |
//pDes = new (ELeave) TBuf8<aBuffer.Size()); // allocating memory for data |
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115 |
pBuffer = HBufC8::New(aBuffer.Size()); |
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116 |
if(!pBuffer) |
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117 |
{ |
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118 |
User::Leave(KErrNoMemory); |
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119 |
} |
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120 |
CleanupStack::Pop(); |
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121 |
TPtr8 pDes = pBuffer->Des( ); |
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122 |
pDes.Copy(aBuffer); // copying data |
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123 |
pRtpStruct->iDes = pBuffer; |
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124 |
pBuffer = NULL; |
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125 |
iBuffers.Insert(pRtpStruct, iNalCount); // storing pointer into the pointer array for retreival later on |
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126 |
iNalCount += 1; // incrementing total NAL count by 1 |
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127 |
} |
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128 |
else if(type == PACKET_STAP_A){ // STAP-A packet -- seperate and add using a virtual don number |
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129 |
TUint accumSize = 0; |
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130 |
TUint16 nalSize = 0; |
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131 |
|
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132 |
accumSize += 1; // incrementing to point ahead of header |
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133 |
while(accumSize != aBuffer.Size()){ |
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134 |
nalSize = Read16(aBuffer, accumSize); |
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135 |
accumSize += 2; |
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136 |
if(nalSize > 0 && nalSize <= aBuffer.Size()){ // valid size, copy data |
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137 |
// storing reference as it is |
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138 |
pRtpStruct = new (ELeave) CAvcRtpStruct; // allocating memory to store RTP header information and data pointer |
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139 |
pRtpStruct->iMarkerBit = aMarkerBit; |
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140 |
pRtpStruct->iArrivalTime = aArrivalTime; |
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141 |
pRtpStruct->iTimeStamp = aTimeStamp; |
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142 |
pRtpStruct->iSeqNo = aSeqNo; |
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143 |
pRtpStruct->iPacketType = type; |
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144 |
pRtpStruct->iDon = (iVirtualDON++)%65535; // virtual DON, wrapping around at 65K (it spans over many NAL units) |
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145 |
|
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146 |
CleanupStack::PushL( pRtpStruct ); // pushing to stack for leave operation |
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147 |
// pDes = new (ELeave) TBuf8<aBuffer.Size()); // allocating memory for data |
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148 |
//pBuffer = HBufC8::New(aBuffer.Size()); |
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149 |
pBuffer = HBufC8::New(nalSize); |
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150 |
if(!pBuffer) |
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151 |
{ |
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152 |
User::Leave(KErrNoMemory); |
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153 |
} |
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154 |
CleanupStack::Pop(); |
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155 |
TPtr8 pDes1 = pBuffer->Des( ); |
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156 |
TPtr8 pStart = aBuffer.MidTPtr(accumSize); |
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157 |
pDes1.Copy(pStart.Ptr(), nalSize); // copying data |
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158 |
pRtpStruct->iDes = pBuffer; |
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159 |
pBuffer = NULL; |
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160 |
iBuffers.Insert(pRtpStruct, iNalCount); // storing pointer into the pointer array for retreival later on |
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161 |
iNalCount += 1; // incrementing total NAL count by 1 |
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162 |
|
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163 |
accumSize += nalSize; |
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164 |
|
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165 |
} |
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166 |
} |
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167 |
} |
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168 |
else if(type == PACKET_FU_A){ // FU-A packet -- add as they are, the jitter buffer removal side will assemble them |
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|
169 |
// storing reference as it is, since FU-A and FU-B will be depacketized at removal time from the jitter buffer |
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170 |
// however, for FU-B extract the DON number |
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|
171 |
|
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172 |
// reading from FU-header byte the start bit |
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173 |
index++; // going to FU-Header Byte start bit, end bit and R bit |
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|
174 |
TUint8 startBit = 0; |
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175 |
const TUint8 * FUHeader = NULL; |
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176 |
TUint8 FUHeader1 = 0; |
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177 |
TInt bufSize = aBuffer.Size(); |
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178 |
startBit = aBuffer[index]; |
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179 |
startBit &= 0x80; // keeping just the start bit |
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180 |
startBit = startBit >> 7; |
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181 |
if(startBit == 1) |
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182 |
{ |
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183 |
pBuffer = HBufC8::New(aBuffer.Size( )+3); // excluding FU NAL Header byte and adding size of AVCPSC1 |
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184 |
if(!pBuffer) |
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185 |
{ |
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186 |
User::Leave(KErrNoMemory); |
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187 |
} |
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188 |
|
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189 |
TPtr8 pDesBuf = pBuffer->Des(); |
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190 |
TPtr8 headerPtr = aBuffer.MidTPtr(index); |
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191 |
FUHeader = headerPtr.Ptr(); |
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192 |
FUHeader1 = *FUHeader; |
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193 |
header &= 0xE0; // making lower bits 0 i.e. type field |
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194 |
header |= (*FUHeader & 0x1F); // now header has the actual NAL unit header values. |
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195 |
pDesBuf.Append(AVCPSC1); // appending start code |
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196 |
pDesBuf.Append(&header, 1); // appending reconstructed header |
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197 |
TPtr8 startPtr = aBuffer.MidTPtr(index+1); // getting pointer to start of NAL unit |
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198 |
pDesBuf.Append(startPtr.Ptr(), bufSize-2); // copying NAL data |
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199 |
} |
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200 |
else |
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201 |
{ |
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202 |
|
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203 |
pBuffer = HBufC8::New(aBuffer.Size( )-1); // excluding FU NAL Header byte |
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204 |
if(!pBuffer) |
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205 |
{ |
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User::Leave(KErrNoMemory); |
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} |
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|
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TPtr8 pDesBuf = pBuffer->Des(); |
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TPtr8 startPtr = aBuffer.MidTPtr(index); // pointing to FUHeader byte |
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FUHeader = startPtr.Ptr(); |
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FUHeader1 = *FUHeader; |
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startPtr = aBuffer.MidTPtr(index+1); // pointing to start of actual data |
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pDesBuf.Append(startPtr.Ptr( ), bufSize-2); // copying FU-Header and data |
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} |
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216 |
|
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pRtpStruct = new (ELeave) CAvcRtpStruct; // allocating memory to store RTP header information and data pointer |
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pRtpStruct->iMarkerBit = aMarkerBit; |
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pRtpStruct->iArrivalTime = aArrivalTime; |
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pRtpStruct->iTimeStamp = aTimeStamp; |
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pRtpStruct->iSeqNo = aSeqNo; |
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pRtpStruct->iPacketType = type; |
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pRtpStruct->iDon = (iVirtualDON++)%65535; // keeping virtual DON for FU-A as zero too |
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pRtpStruct->iDes = pBuffer; |
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pRtpStruct->iFUHeader = FUHeader1; // index currently pointing to FU-Header Byte |
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pBuffer = NULL; |
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iBuffers.Insert(pRtpStruct, iNalCount); // storing pointer into the pointer array for retreival later on |
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iNalCount += 1; |
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} |
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230 |
|
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aNalCount = iNalCount; |
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return ETrue; |
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} |
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|
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// ----------------------------------------------------------------------------- |
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// CRFC3984Decode::Write16() |
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// Purpose : This function writes the 16 bit value in network byte order in buffer aDes (appends it to the next location) |
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// Parameters : aDes - Buffer to which value has to be written |
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// aValue - Value to be written |
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// Return Value: |
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// ----------------------------------------------------------------------------- |
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// |
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243 |
|
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void CRFC3984Decode::Write16(TDes8 & aDes, TUint16 aValue) |
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{ |
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TUint8 firstByte = (aValue & 0xFF00) >> 8; |
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TUint8 secondByte = (aValue & 0xFF); |
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aDes.Append(&firstByte, 1); |
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aDes.Append(&secondByte, 1); |
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|
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} |
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252 |
|
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// ----------------------------------------------------------------------------- |
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// CRFC3984Decode::Read16() |
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// Purpose : This function reads the 16 bit value in network byte order in buffer aDes (appends it to the next location) |
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// Parameters : aDes - Buffer to read from |
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// aIndex - Buffer index where to read from |
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// Return Value: Returns the 16-bit value |
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// ----------------------------------------------------------------------------- |
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// |
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261 |
|
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TUint16 CRFC3984Decode::Read16(TDes8 & aDes, TInt aIndex) |
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263 |
{ |
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TUint16 value; |
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265 |
|
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value = (aDes[aIndex+1]) + (aDes[aIndex] << 8); |
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267 |
|
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return value; |
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} |
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270 |
|
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// ----------------------------------------------------------------------------- |
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// CRFC3984Decode::GetNalUnit(TInt aIndex) |
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// Purpose : This function returns the depayloadized NAL unit with RTP header information |
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// Parameters : aIndex - Index of the entry |
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// |
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// Return Value: Returns a pointer to the CAvcRtpStruct structure. |
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// ----------------------------------------------------------------------------- |
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// |
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279 |
|
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CAvcRtpStruct * CRFC3984Decode::GetNalUnit(TInt aIndex) |
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{ |
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CAvcRtpStruct * ptr; |
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if(aIndex >= iNalCount) |
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return 0; |
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285 |
|
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ptr = iBuffers[aIndex]; |
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return ptr; |
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} |
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289 |
|
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290 |
|
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void CRFC3984Decode::ClearBuffer() |
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{ |
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if(iNalCount == 0) |
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return; |
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|
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TInt count = 0; |
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CAvcRtpStruct * ptr = NULL; |
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for(count = 0; count < iNalCount; count++){ |
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ptr = iBuffers[count]; |
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|
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if(ptr->iDes) delete ptr->iDes; |
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if(ptr) delete ptr; |
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ptr = NULL; |
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|
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} |
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iBuffers.Reset( ); |
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iNalCount = 0; |
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} |
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|
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310 |
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Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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// EOF |