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 provide TS conversion for an RTP-stream based on* |
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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 "CRtpTsConverter.h" |
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22 #include <ipvideo/CRtpUtil.h> |
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23 #include "videoserviceutilsLogger.h" |
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24 |
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25 // CONSTANTS |
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26 const TInt KValidRtcpType( 200 ); |
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27 const TInt KTypeBytesPoint( 1 ); |
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28 const TInt KNtpSecBytesPoint( 8 ); |
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29 const TInt KNtpFracBytesPoint( 12 ); |
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30 const TInt KRtcpTsBytesPoint( 16 ); |
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31 |
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32 // ============================ MEMBER FUNCTIONS =============================== |
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33 |
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34 // ----------------------------------------------------------------------------- |
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35 // CRtpTsConverter::NewL |
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36 // Two-phased constructor. |
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37 // ----------------------------------------------------------------------------- |
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38 // |
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39 EXPORT_C CRtpTsConverter* CRtpTsConverter::NewL( const TUint aClockRate ) |
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40 { |
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41 CRtpTsConverter* self = new( ELeave ) CRtpTsConverter( aClockRate ); |
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42 CleanupStack::PushL( self ); |
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43 self->ConstructL(); |
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44 CleanupStack::Pop( self ); |
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45 return self; |
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46 } |
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47 |
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48 // ----------------------------------------------------------------------------- |
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49 // CRtpTsConverter::CRtpTsConverter |
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50 // C++ default constructor can NOT contain any code, that might leave. |
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51 // ----------------------------------------------------------------------------- |
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52 // |
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53 CRtpTsConverter::CRtpTsConverter( const TUint aClockRate ) |
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54 : iClockRate( aClockRate ), |
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55 iOffset( 0 ), |
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56 iInitiated( EFalse ) |
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57 { |
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58 // None |
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59 } |
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60 |
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61 // ----------------------------------------------------------------------------- |
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62 // CRtpTsConverter::ConstructL |
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63 // Symbian 2nd phase constructor can leave. |
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64 // ----------------------------------------------------------------------------- |
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65 // |
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66 void CRtpTsConverter::ConstructL() |
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67 { |
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68 // None |
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69 } |
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70 |
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71 // ----------------------------------------------------------------------------- |
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72 // CRtpTsConverter::CRtpTsConverter |
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73 // Destructor. |
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74 // ----------------------------------------------------------------------------- |
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75 // |
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76 EXPORT_C CRtpTsConverter::~CRtpTsConverter() |
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77 { |
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78 // None |
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79 } |
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80 |
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81 // ----------------------------------------------------------------------------- |
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82 // CRtpTsConverter::Init |
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83 // |
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84 // ----------------------------------------------------------------------------- |
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85 // |
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86 EXPORT_C void CRtpTsConverter::Init( const TDesC8& aRtcpPkt ) |
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87 { |
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88 // Verify packet type? |
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89 if ( aRtcpPkt.Length() > ( KRtcpTsBytesPoint + KIntegerBytes ) && |
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90 aRtcpPkt[KTypeBytesPoint] == KValidRtcpType && iClockRate > 0 ) |
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91 { |
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92 // Handle RTCP packet |
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93 TUint ntp_sec( 0 ); |
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94 TUint ntp_frac( 0 ); |
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95 TUint rtcp_ts( 0 ); |
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96 TInt err( CRtpUtil::GetValue( |
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97 aRtcpPkt.Mid( KNtpSecBytesPoint, KIntegerBytes ), ntp_sec ) ); |
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98 if ( !err ) |
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99 { |
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100 LOG1( "CRtpTsConverter::Init(), NTP Timestamp, MSW: %u", ntp_sec ); |
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101 err = CRtpUtil::GetValue( |
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102 aRtcpPkt.Mid( KNtpFracBytesPoint, KIntegerBytes ), ntp_frac ); |
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103 } |
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104 if ( !err ) |
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105 { |
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106 LOG1( "CRtpTsConverter::Init(), NTP Timestamp, LSW: %u", ntp_frac ); |
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107 err = CRtpUtil::GetValue( |
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108 aRtcpPkt.Mid( KRtcpTsBytesPoint, KIntegerBytes ), rtcp_ts ); |
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109 } |
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110 |
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111 if ( !err ) |
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112 { |
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113 LOG1( "CRtpTsConverter::Init(), RTP Timestamp: %u", rtcp_ts ); |
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114 // Calculate the wallclock time when this RTCP packet is generated |
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115 TUint wallClock( ( ntp_sec & 0x00FF ) * 1000 ); |
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116 wallClock += ( ( ( ntp_frac >> 16 ) & 0x0000FFFF ) * 1000 ) >> 16; |
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117 |
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118 // Compute the proper time offset |
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119 iOffset = ComputeOffset( rtcp_ts, wallClock, iClockRate ); |
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120 } |
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121 } |
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122 } |
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123 // ----------------------------------------------------------------------------- |
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124 // CRtpTsConverter::Init |
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125 // Compute the proper time offset. No wallclok time available. |
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126 // ----------------------------------------------------------------------------- |
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127 // |
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128 EXPORT_C void CRtpTsConverter::Init( const TUint& aTs ) |
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129 { |
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130 iOffset = ComputeOffset( aTs, 0, iClockRate ); |
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131 } |
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132 |
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133 // ----------------------------------------------------------------------------- |
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134 // CRtpTsConverter::Initiated |
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135 // Returns: initiated status of converter. |
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136 // ----------------------------------------------------------------------------- |
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137 // |
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138 EXPORT_C TBool CRtpTsConverter::Initiated() |
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139 { |
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140 return iInitiated; |
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141 } |
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142 |
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143 // ----------------------------------------------------------------------------- |
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144 // CRtpTsConverter::UnInitiate |
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145 // |
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146 // ----------------------------------------------------------------------------- |
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147 // |
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148 EXPORT_C void CRtpTsConverter::UnInitiate() |
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149 { |
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150 iInitiated = EFalse; |
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151 } |
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152 |
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153 // ----------------------------------------------------------------------------- |
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154 // CRtpTsConverter::ConvertTs |
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155 // Returns: converted unsigned integer value of timestamp. |
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156 // ----------------------------------------------------------------------------- |
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157 // |
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158 EXPORT_C TUint CRtpTsConverter::ConvertTs( |
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159 const TUint aTimestamp, |
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160 TBool aUseWallClock ) |
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161 { |
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162 TUint ret( KMaxTUint ); |
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163 |
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164 if ( iClockRate == KPipelineClockRate ) |
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165 { |
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166 ret = aTimestamp - iOffset; |
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167 } |
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168 else |
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169 { |
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170 if ( iClockRate > 0 ) |
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171 { |
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172 ret = aTimestamp - iOffset; |
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173 |
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174 if ( aUseWallClock ) |
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175 { |
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176 TUint sec( ret / iClockRate ); |
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177 TUint subSec( ret % iClockRate ); |
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178 ret = ( ( sec * KPipelineClockRate ) + |
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179 ( subSec * KPipelineClockRate ) / iClockRate ); |
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180 } |
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181 } |
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182 } |
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183 |
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184 return ret; |
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185 } |
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186 |
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187 // ----------------------------------------------------------------------------- |
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188 // CRtpTsConverter::ComputeOffset |
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189 // Returns: offset of the RTP timestamp. |
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190 // ----------------------------------------------------------------------------- |
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191 // |
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192 TUint CRtpTsConverter::ComputeOffset( |
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193 TUint aRtpTime, |
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194 TUint aSeekTime, |
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195 TInt aClockRate ) |
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196 { |
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197 TUint ret( KMaxTUint ); |
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198 |
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199 if ( aClockRate ) |
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200 { |
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201 TUint rtpSec( aRtpTime / aClockRate ); |
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202 TUint rtpFracSecTU( aRtpTime % aClockRate ); // transport units |
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203 TUint seekSec( aSeekTime / 1000 ); |
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204 TUint seekFracSecTU( ( ( aSeekTime % 1000) * aClockRate ) / 1000 ); |
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205 |
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206 TUint offsetSec( rtpSec - seekSec ); |
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207 TUint offsetFracSecTU( rtpFracSecTU - seekFracSecTU ); |
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208 |
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209 if ( rtpFracSecTU < seekFracSecTU ) |
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210 { |
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211 offsetSec--; |
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212 offsetFracSecTU = aClockRate + rtpFracSecTU - seekFracSecTU; |
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213 } |
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214 |
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215 ret = ( offsetSec * aClockRate ) + offsetFracSecTU; |
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216 iInitiated = ETrue; |
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217 } |
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218 |
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219 return ret; |
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220 } |
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221 |
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222 // End of File |
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