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1 /* |
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2 * Copyright (c) 2002-2006 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: PayloadFormat plugin capable to read RTP payload containing |
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15 * AMR audio. |
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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 "amrpayloadencoder.h" |
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24 #include "amrcommonutil.h" |
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25 |
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26 |
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27 // ============================= LOCAL FUNCTIONS =============================== |
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28 |
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29 // ============================ MEMBER FUNCTIONS =============================== |
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30 |
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31 // ----------------------------------------------------------------------------- |
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32 // CAmrPayloadEncoder::CAmrPayloadEncoder |
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33 // C++ default constructor can NOT contain any code, that |
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34 // might leave. |
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35 // ----------------------------------------------------------------------------- |
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36 // |
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37 CAmrPayloadEncoder::CAmrPayloadEncoder( TBool aIsNb ) : CAmrPayloadFormatter( aIsNb ) |
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38 { |
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39 DP_AMR_ENCODE( "CAmrPayloadEncoder::CAmrPayloadEncoder" ); |
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40 |
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41 CAmrPayloadEncoder::InitializeFrameEncoder( ); |
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42 } |
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43 |
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44 |
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45 // ----------------------------------------------------------------------------- |
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46 // CAmrPayloadEncoder::ConstructL |
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47 // Symbian 2nd phase constructor can leave. |
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48 // ----------------------------------------------------------------------------- |
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49 // |
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50 void CAmrPayloadEncoder::ConstructL( ) |
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51 { |
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52 DP_AMR_ENCODE( "CAmrPayloadEncoder::ConstructL" ); |
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53 |
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54 // Allocate memory for iHeaderEncoder and iTocEntryEncoder |
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55 iHeaderEncoder = CAmrPayloadHeader::NewL(); |
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56 iTocEntryEncoder = CAmrTocEntry::NewL(); |
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57 |
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58 #ifdef FTD_ENABLED |
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59 User::LeaveIfError( iCodecStatsQueue.OpenGlobal( KMccCodecStats, EOwnerProcess ) ); |
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60 #endif |
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61 } |
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62 |
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63 |
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64 // ----------------------------------------------------------------------------- |
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65 // CAmrPayloadEncoder::NewL |
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66 // Two-phased constructor. |
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67 // ----------------------------------------------------------------------------- |
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68 // |
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69 CAmrPayloadEncoder* CAmrPayloadEncoder::NewL( TBool aIsNb ) |
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70 { |
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71 DP_AMR_ENCODE( "CAmrPayloadEncoder::NewL" ); |
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72 |
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73 CAmrPayloadEncoder* self = new( ELeave ) CAmrPayloadEncoder( aIsNb ); |
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74 |
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75 CleanupStack::PushL( self ); |
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76 self->ConstructL( ); |
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77 CleanupStack::Pop( self ); |
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78 |
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79 return self; |
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80 } |
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81 |
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82 |
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83 // Destructor |
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84 CAmrPayloadEncoder::~CAmrPayloadEncoder( ) |
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85 { |
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86 DP_AMR_ENCODE( "CAmrPayloadEncoder::~CAmrPayloadEncoder" ); |
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87 |
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88 delete iHeaderEncoder; |
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89 delete iTocEntryEncoder; |
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90 |
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91 #ifdef FTD_ENABLED |
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92 |
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93 iCodecStatsQueue.Close(); |
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94 |
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95 #endif |
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96 } |
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97 |
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98 // ----------------------------------------------------------------------------- |
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99 // CAmrPayloadEncoder::DoInitialize |
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100 // Initialize encoder. Encoder MUST BE initialized when starting playing. |
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101 // ----------------------------------------------------------------------------- |
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102 // |
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103 void CAmrPayloadEncoder::DoInitialize() |
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104 { |
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105 DP_AMR_ENCODE( "CAmrPayloadEncoder::DoInitialize" ); |
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106 |
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107 iRedIntervalCollected = EFalse; |
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108 iFrameIndex = iRedCount; |
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109 } |
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110 |
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111 // ----------------------------------------------------------------------------- |
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112 // CAmrPayloadEncoder::SetModeRequest |
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113 // Set ModeRequest. |
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114 // ----------------------------------------------------------------------------- |
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115 // |
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116 void CAmrPayloadEncoder::SetModeRequest( TAmrModeRequest aRequest ) |
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117 { |
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118 DP_AMR_ENCODE2( "CAmrPayloadEncoder::SetModeRequest - REQUEST: %d", aRequest ); |
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119 |
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120 iModeRequest = aRequest; |
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121 |
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122 #ifdef FTD_ENABLED |
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123 |
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124 TMccCodecStats stats; |
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125 stats.iCMRUplink = iModeRequest; |
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126 stats.SetFieldUpdatedFlag( ECMRUplink ); |
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127 iCodecStatsQueue.Send( stats ); |
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128 |
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129 #endif |
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130 } |
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131 |
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132 |
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133 // ----------------------------------------------------------------------------- |
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134 // CAmrPayloadEncoder::EncodeFrame |
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135 // Encode a received AMR frame into the payload buffer to be sent. |
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136 // If AMR FEC redundancy is used and we have collected needed count of redundant |
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137 // frames, them are encoded first to the payload buffer. Last iRedCount frames |
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138 // are saved to be used with next RTP packet. iRedCount first frames in the |
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139 // 'iFrames'-array are reserved for redundant frames info saving. Thus new |
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140 // frames starts from index iFrames[iRedCount]. |
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141 // ----------------------------------------------------------------------------- |
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142 // |
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143 TBool CAmrPayloadEncoder::EncodeFrame( TInt aChannel, |
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144 TAmrFrameType aFrameType, |
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145 TUint8 aFrameQualityInd, |
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146 const TDes8& aFrameData ) |
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147 { |
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148 DP_AMR_ENCODE( "CAmrPayloadEncoder::EncodeFrame" ); |
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149 |
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150 TBool payloadComplete( EFalse ); |
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151 |
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152 // Encode redundant frames if there is some |
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153 // Frame info relating to redundant frames is saved at the beginning of iFrames |
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154 TInt count( iFrameDatas.Count() ); |
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155 |
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156 if ( iRedCount == iFrameIndex && count && iRedIntervalCollected ) |
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157 { |
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158 for ( TInt i = iRedCount - count; i < iRedCount; i++ ) |
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159 { |
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160 const TUint8* redFrameData = iFrames[i].iFrameData; |
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161 TInt speechBits = SpeechBitCount( iFrames[i].iFrameType ); |
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162 iFrameEncoder.Encode( redFrameData, 0, 0, speechBits ); |
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163 iTotalSpeechBits += speechBits; |
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164 |
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165 #ifdef _DEBUG |
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166 if ( speechBits ) |
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167 { |
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168 DP_AMR_ENCODE2( "ENCODING RED FRAME #%d: ", i ); |
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169 DP_AMR_ENCODE6( "| %d | %d | %d | %d | %d |", redFrameData[KNumValue0], |
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170 redFrameData[KNumValue1], redFrameData[KNumValue2], |
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171 redFrameData[KNumValue3], redFrameData[KNumValue4] ); |
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172 } |
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173 else |
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174 { |
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175 DP_AMR_ENCODE2( "ENCODING RED FRAME #%d: - NO DATA FRAME", i ); |
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176 } |
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177 #endif |
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178 } |
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179 } |
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180 |
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181 // Update iFrames array |
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182 iFrames[iFrameIndex].iFrameType = aFrameType; |
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183 iFrames[iFrameIndex].iFrameQualityInd = aFrameQualityInd; |
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184 iFrames[iFrameIndex].iChannel = aChannel; |
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185 if ( EAmrFrameNoData == aFrameType ) |
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186 { |
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187 DP_AMR_ENCODE( "FRAME TO ENCODE - NO DATA FRAME" ); |
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188 |
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189 iFrames[iFrameIndex].iFrameData = NULL; |
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190 iFrames[iFrameIndex].iBitIndex = 0; |
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191 } |
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192 else |
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193 { |
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194 iFrames[iFrameIndex].iFrameData = iPayload + iFrameEncoder.ByteIndex( ); |
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195 iFrames[iFrameIndex].iBitIndex = TUint( iFrameEncoder.BitIndex( ) ); |
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196 const TUint8* frameData = aFrameData.Ptr( ); |
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197 |
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198 // Get the speech bit count of current frame |
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199 TInt speechBits = SpeechBitCount( aFrameType ); |
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200 iFrameEncoder.Encode( frameData, 0, 0, speechBits ); |
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201 |
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202 // Update TotalSpeechBits |
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203 iTotalSpeechBits += speechBits; |
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204 |
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205 #ifdef _DEBUG |
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206 DP_AMR_ENCODE2( "ENCODED FRAME #%d: ", iFrameIndex ); |
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207 if ( aFrameData.Size() ) |
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208 { |
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209 TStreamDecoder decoder; |
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210 TUint8* refBufPtr = iFrames[iFrameIndex].iFrameData; |
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211 decoder.Initialize( refBufPtr, 0, TInt( iFrames[iFrameIndex].iBitIndex ) ); |
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212 TUint32 vals[KNumValue5]; |
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213 for ( TInt v = 0; v < (TInt) KNumValue5; v++ ) |
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214 { |
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215 vals[v] = decoder.Decode( KBitsIn1Byte ); |
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216 } |
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217 DP_AMR_ENCODE6( "| %d | %d | %d | %d | %d |", vals[KNumValue0], |
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218 vals[KNumValue1], vals[KNumValue2], vals[KNumValue3], vals[KNumValue4] ); |
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219 } |
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220 #endif |
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221 } |
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222 |
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223 iFrameIndex++; |
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224 if ( iFrameIndex == iFrameCount + iRedCount ) |
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225 { |
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226 DP_AMR_ENCODE( "CAmrPayloadEncoder::EncodeFrame - NEEDED FRAMES COLLECTED" ); |
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227 |
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228 // Add header information to the RTP packet |
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229 TInt payloadLen = Encode( iPayload ); |
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230 DP_AMR_ENCODE3( "CAmrPayloadEncoder::EncodeFrame - PAYLOAD SIZE: %d, TARGET MAX: %d", |
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231 payloadLen, iPayloadPtr.MaxLength() ); |
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232 iPayloadPtr.SetLength( payloadLen ); |
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233 |
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234 // Finish a payload |
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235 iFrameIndex = iRedCount; |
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236 iTotalSpeechBits = 0; |
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237 SaveRedundantFrame( aFrameData ); |
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238 if ( iRedCount <= iFrameDatas.Count() ) |
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239 { |
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240 iRedIntervalCollected = ETrue; |
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241 } |
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242 |
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243 // Reset iFrameEncoder |
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244 InitializeFrameEncoder( ); |
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245 payloadComplete = ETrue; |
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246 } |
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247 else if ( iRedCount && iFrameIndex > iFrameCount ) |
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248 { |
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249 // Save iRedCount latest frames to be sent with next RTP packet as redundancy |
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250 SaveRedundantFrame( aFrameData ); |
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251 } |
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252 else |
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253 { |
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254 // Make PC-LINT happy. |
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255 } |
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256 |
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257 return payloadComplete; |
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258 } |
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259 |
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260 // ----------------------------------------------------------------------------- |
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261 // CAmrPayloadEncoder::SaveRedundantFrame |
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262 // Saves frame to the array reserved for redundancy saving. |
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263 // ----------------------------------------------------------------------------- |
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264 // |
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265 void CAmrPayloadEncoder::SaveRedundantFrame( const TDes8& aFrameData ) |
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266 { |
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267 DP_AMR_ENCODE( "CAmrPayloadEncoder::SaveRedundantFrame" ); |
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268 |
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269 HBufC8* hFrame = aFrameData.Alloc(); |
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270 if ( hFrame ) |
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271 { |
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272 if ( iFrameDatas.Append( hFrame ) != KErrNone ) |
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273 { |
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274 delete hFrame; |
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275 } |
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276 else if ( iRedCount < iFrameDatas.Count() ) |
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277 { |
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278 delete iFrameDatas[0]; |
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279 iFrameDatas.Remove( 0 ); |
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280 } |
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281 } |
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282 } |
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283 |
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284 // ----------------------------------------------------------------------------- |
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285 // CAmrPayloadEncoder::ResetPayloadBuffer |
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286 // Resets iFrames array. iRedCount newest frames from payload just sent are |
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287 // copied to the beginning of the iFrames array, where is area reserved for |
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288 // redundant frames keeping. That way frames can be encoded to the next payload |
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289 // as redundat frames. |
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290 // ----------------------------------------------------------------------------- |
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291 // |
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292 void CAmrPayloadEncoder::ResetPayloadBuffer( ) |
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293 { |
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294 DP_AMR_ENCODE( "CAmrPayloadEncoder::ResetPayloadBuffer" ); |
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295 |
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296 iFrameIndex = iRedCount; |
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297 iPayloadPtr.SetLength( 0 ); |
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298 |
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299 // Save redCount newest frames to the beginning of iFrames array |
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300 TInt numOfRedFrames = iFrameDatas.Count(); |
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301 if ( iRedCount - numOfRedFrames >= 0 ) |
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302 { |
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303 for ( TInt i = iRedCount - numOfRedFrames; i < iRedCount; i++ ) |
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304 { |
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305 if ( i > KMaxFrameCountPerPacket ) |
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306 { |
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307 DP_AMR_ENCODE3("CAmrPayloadEncoder::ResetPayloadBuffer,\ |
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308 i: %d > KMaxFrameCountPerPacket: %d", \ |
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309 i , KMaxFrameCountPerPacket); |
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310 } |
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311 if ( ( i + iFrameCount ) > KMaxFrameCountPerPacket ) |
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312 { |
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313 DP_AMR_ENCODE3("CAmrPayloadEncoder::ResetPayloadBuffer, i + iFrameCount: %d > KMaxFrameCountPerPacket: %d", \ |
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314 (i + iFrameCount) , KMaxFrameCountPerPacket); |
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315 } |
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316 |
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317 // Checking index limit to appease PC-lint |
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318 if ( ( i + iFrameCount ) < KMaxFrameCountPerPacket ) |
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319 { |
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320 iFrames[ i ] = iFrames[ i + iFrameCount ]; |
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321 |
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322 } |
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323 } |
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324 |
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325 for ( TInt j = 0; j < numOfRedFrames; j++ ) |
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326 { |
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327 |
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328 if ( ( j + ( iRedCount - numOfRedFrames ) ) > KMaxFrameCountPerPacket ) |
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329 { |
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330 DP_AMR_ENCODE3("CAmrPayloadEncoder::ResetPayloadBuffer,\ |
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331 j + ( iRedCount - numOfRedFrames ): %d > KMaxFrameCountPerPacket: %d", \ |
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332 ( j + ( iRedCount - numOfRedFrames ) ), KMaxFrameCountPerPacket); |
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333 } |
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334 |
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335 // Checking index limit to appease PC-lint |
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336 if ( ( j + ( iRedCount - numOfRedFrames ) ) < KMaxFrameCountPerPacket ) |
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337 { |
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338 |
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339 // Move frame data ptr to point redundant frames |
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340 iFrames[ j + ( iRedCount - numOfRedFrames ) ].iFrameData |
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341 = const_cast<TUint8*>( ( *iFrameDatas[ j ] ).Ptr() ); |
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342 |
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343 } |
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344 } |
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345 } |
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346 else |
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347 { |
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348 DP_AMR_ENCODE( "CAmrPayloadEncoder::ResetPayloadBuffer - TOO MANY RED FRAMES" ); |
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349 } |
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350 |
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351 // NULL rest of frame datas |
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352 TInt index( KMaxFrameCountPerPacket ); |
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353 while ( --index >= iRedCount ) |
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354 { |
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355 iFrames[index].iFrameData = NULL; |
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356 } |
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357 } |
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358 |
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359 // ----------------------------------------------------------------------------- |
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360 // CAmrPayloadEncoder::SetChannelCount |
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361 // Set number of audio channels. |
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362 // ----------------------------------------------------------------------------- |
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363 // |
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364 TInt CAmrPayloadEncoder::SetChannelCount( TInt aChannelCount ) |
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365 { |
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366 DP_AMR_ENCODE2( "CAmrPayloadEncoder::SetChannelCount - COUNT: %d", aChannelCount ); |
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367 |
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368 TInt ret = CAmrPayloadFormatter::SetChannelCount( aChannelCount ); |
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369 InitializeFrameEncoder( ); |
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370 return ret; |
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371 } |
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372 |
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373 // ----------------------------------------------------------------------------- |
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374 // CAmrPayloadEncoder::SetFrameBlockCount |
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375 // Set number of AMR frame blocks included in one RTP packet. |
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376 // ----------------------------------------------------------------------------- |
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377 // |
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378 TInt CAmrPayloadEncoder::SetFrameBlockCount( TInt aFrameblockCount ) |
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379 { |
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380 DP_AMR_ENCODE2( "CAmrPayloadEncoder::SetFrameBlockCount - COUNT: %d", aFrameblockCount ); |
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381 |
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382 TInt ret = CAmrPayloadFormatter::SetFrameBlockCount( aFrameblockCount ); |
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383 InitializeFrameEncoder( ); |
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384 return ret; |
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385 } |
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386 |
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387 // ----------------------------------------------------------------------------- |
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388 // CAmrPayloadEncoder::SetRedFrameBlockCount |
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389 // Set number of redundant AMR frame blocks to be included in one RTP packet. |
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390 // ----------------------------------------------------------------------------- |
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391 // |
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392 TInt CAmrPayloadEncoder::SetRedFrameBlockCount( TInt aRedBlockCount ) |
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393 { |
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394 DP_AMR_ENCODE2( "CAmrPayloadEncoder::SetFrameBlockCount - COUNT: %d", aRedBlockCount ); |
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395 |
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396 if ( KMaxAmrRedCount >= aRedBlockCount && 0 <= aRedBlockCount ) |
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397 { |
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398 iRedCount = aRedBlockCount; |
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399 return KErrNone; |
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400 } |
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401 else |
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402 { |
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403 return KErrArgument; |
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404 } |
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405 } |
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406 |
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407 // ----------------------------------------------------------------------------- |
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408 // CAmrPayloadEncoder::Encode |
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409 // Encode the AMR payload ( for one RTP packet ) into a given buffer. |
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410 // If payload contains only NO_DATA frames, packet is not encoded at all. |
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411 // NO_DATA frames at the end of payload are ripped off. |
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412 // ----------------------------------------------------------------------------- |
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413 // |
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414 TInt CAmrPayloadEncoder::Encode( TUint8* aBuffer ) |
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415 { |
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416 DP_AMR_ENCODE( "CAmrPayloadEncoder::Encode" ); |
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417 |
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418 TInt byteIndex( 0 ); |
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419 TInt bitIndex( 0 ); |
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420 |
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421 // Rip off extra NO_DATA frames |
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422 TInt framesDiscarded = DiscardExtraNoDataFrames( ); |
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423 if ( iRedIntervalCollected ) |
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424 { |
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425 if ( framesDiscarded == iFrameCount + iRedCount ) |
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426 { |
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427 DP_AMR_ENCODE( "PACKET WILL NOT BE SENT - ONLY NO DATA FRAMES" ); |
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428 return 0; |
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429 } |
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430 } |
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431 else |
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432 { |
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433 if ( framesDiscarded == iFrameCount ) |
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434 { |
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435 DP_AMR_ENCODE( "PACKET WILL NOT BE SENT - NEW FRAMES WERE NO DATA FRAMES" ); |
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436 DP_AMR_ENCODE2( "CAmrPayloadEncoder::Encode framesDiscarded: %d", framesDiscarded ); |
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437 return 0; |
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438 } |
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439 } |
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440 |
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441 // Encode payload header |
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442 iHeaderEncoder->iCmr = iModeRequest; |
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443 iHeaderEncoder->Encode( aBuffer, byteIndex, bitIndex ); |
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444 |
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445 // Encode TOC entries |
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446 EncodeTableOfContents( aBuffer, byteIndex, bitIndex ); |
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447 |
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448 // Pad last several bits if needed |
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449 TInt totalBytes = iFrameEncoder.ByteIndex(); |
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450 |
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451 if ( iFrameEncoder.BitIndex() != 0 ) |
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452 { |
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453 // Padding Zeros |
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454 iFrameEncoder.Encode( 0, KBitsIn1Byte - iFrameEncoder.BitIndex() ); |
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455 totalBytes++; |
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456 } |
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457 |
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458 return totalBytes; |
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459 } |
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460 |
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461 // ----------------------------------------------------------------------------- |
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462 // CAmrPayloadEncoder::DiscardExtraNoDataFrames |
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463 // Unwanted NO_DATA frames are ripped off from payload according to RFC3267: 4.3.2. |
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464 // TOC-fields indicating NO_DATA frame are deleted and speech bits following |
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465 // TOCs are moved to start earlier correspondingly. |
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466 // ----------------------------------------------------------------------------- |
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467 // |
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468 TInt CAmrPayloadEncoder::DiscardExtraNoDataFrames( ) |
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469 { |
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470 DP_AMR_ENCODE( "CAmrPayloadEncoder::DiscardExtraNoDataFrames" ); |
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471 |
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472 TInt endIndex( iFrameCount + iRedCount ); |
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473 iFramesDiscarded = 0; |
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474 |
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475 // write debug info if the endIndex is greater than the iFrames[] range |
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476 if ( endIndex > KMaxFrameCountPerPacket ) |
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477 { |
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478 DP_AMR_ENCODE3("CAmrPayloadEncoder::DiscardExtraNoDataFrames, endIndex: %d > KMaxFrameCountPerPacket: %d", \ |
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479 endIndex, KMaxFrameCountPerPacket); |
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480 } |
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481 // Count NO_DATA frames to reject |
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482 for ( TInt i = 0; i < endIndex; i++ ) |
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483 { |
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484 if ( EAmrFrameNoData == iFrames[i].iFrameType ) |
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485 { |
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486 iFramesDiscarded++; |
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487 } |
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488 else |
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489 { |
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490 iFramesDiscarded = 0; |
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491 } |
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492 } |
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493 |
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494 // Move speech bits to start earlier if TOCs are removed |
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495 if ( iFramesDiscarded ) |
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496 { |
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497 DP_AMR_ENCODE2( "CAmrPayloadEncoder::DiscardExtraNoDataFrames - REJECT %d FRAMES", iFramesDiscarded ); |
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498 |
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499 TStreamDecoder decoder; |
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500 TStreamEncoder encoder; |
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501 |
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502 TInt numOfRedFrames( 0 ); |
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503 if ( iRedIntervalCollected ) |
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504 { |
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505 numOfRedFrames = iFrameDatas.Count(); |
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506 } |
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507 |
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508 TInt writeByteIndex = ( KHeaderBitsBE |
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509 + KTOCFieldBitsBE * ( iFrameCount + numOfRedFrames - iFramesDiscarded ) ) |
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510 / KBitsIn1Byte; |
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511 |
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512 TInt writeBitIndex = ( KHeaderBitsBE |
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513 + KTOCFieldBitsBE * ( iFrameCount + numOfRedFrames - iFramesDiscarded ) ) |
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514 % KBitsIn1Byte; |
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515 |
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516 encoder.Initialize( iPayload, writeByteIndex, writeBitIndex ); |
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517 |
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518 DP_AMR_ENCODE3( "AMR ENCODER - START BYTE IND: %d, BIT IND: %d", |
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519 encoder.ByteIndex(), encoder.BitIndex() ); |
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520 |
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521 TInt readByteIndex = ( KHeaderBitsBE |
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522 + KTOCFieldBitsBE * ( iFrameCount + numOfRedFrames ) ) |
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523 / KBitsIn1Byte; |
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524 TInt readBitIndex = ( KHeaderBitsBE |
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525 + KTOCFieldBitsBE * ( iFrameCount + numOfRedFrames ) ) |
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526 % KBitsIn1Byte; |
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527 |
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528 decoder.Initialize( iPayload, readByteIndex, readBitIndex ); |
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529 |
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530 // Move speech bits |
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531 encoder.Encode( iPayload, readByteIndex, readBitIndex, iTotalSpeechBits ); |
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532 |
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533 DP_AMR_ENCODE3( "AMR ENCODER - END BYTE IND: %d, BIT IND: %d", |
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534 encoder.ByteIndex(), encoder.BitIndex() ); |
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535 |
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536 // Update frame encoder position so that payload length is set correctly |
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537 iFrameEncoder.Initialize( iPayload, encoder.ByteIndex(), encoder.BitIndex() ); |
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538 } |
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539 |
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540 return iFramesDiscarded; |
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541 } |
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542 |
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543 // ----------------------------------------------------------------------------- |
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544 // CAmrPayloadEncoder::ReEncodeFrame |
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545 // Do bit shifting when AmrPayloadFormatPlugin is doing buffer flushing. |
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546 // ----------------------------------------------------------------------------- |
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547 // |
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548 TBool CAmrPayloadEncoder::ReEncodeFrameL( ) |
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549 { |
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550 return ReEncodeFrameL( iPayload ); |
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551 } |
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552 |
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553 // ----------------------------------------------------------------------------- |
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554 // CAmrPayloadEncoder::ReEncodeFrame |
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555 // Do bit shifting when AmrPayloadFormatPlugin is doing buffer flushing. |
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556 // ----------------------------------------------------------------------------- |
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557 // |
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558 TBool CAmrPayloadEncoder::ReEncodeFrameL( TUint8* aBuffer ) |
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559 { |
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560 DP_AMR_ENCODE( "CAmrPayloadEncoder::ReEncodeFrameL" ); |
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561 |
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562 // No outstanding buffer at all |
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563 if ( iFrameIndex == iRedCount ) |
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564 { |
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565 return EFalse; |
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566 } |
|
567 |
|
568 // Only called when AmrPayloadFormatPlugin is flushing buffer out |
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569 TInt byteIndex( 0 ); |
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570 TInt bitIndex( 0 ); |
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571 |
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572 // Encode payload header |
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573 iHeaderEncoder->iCmr = iModeRequest; |
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574 iHeaderEncoder->Encode( aBuffer, byteIndex, bitIndex ); |
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575 |
|
576 // Encode TOC entries |
|
577 EncodeTableOfContents( aBuffer, byteIndex, bitIndex ); |
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578 |
|
579 // Do bit shifting for the speech bits |
|
580 // orginal starting position |
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581 TInt frameByteIndex = ( KHeaderBitsBE |
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582 + KTOCFieldBitsBE * ( iFrameCount + iRedCount ) ) / KBitsIn1Byte; |
|
583 |
|
584 TInt frameBitIndex = ( KHeaderBitsBE |
|
585 + KTOCFieldBitsBE * ( iFrameCount + iRedCount ) ) % KBitsIn1Byte; |
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586 |
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587 // Current speech data length |
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588 TInt speechBytes |
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589 = ( iTotalSpeechBits % KBitsIn1Byte == 0 ) |
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590 ? iTotalSpeechBits / KBitsIn1Byte : iTotalSpeechBits / KBitsIn1Byte + 1; |
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591 |
|
592 // Read out speech data to temp buffer |
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593 TUint8* tempBuf = static_cast<TUint8*> |
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594 ( User::AllocL( sizeof( TUint8 ) * TUint8( speechBytes ) ) ); |
|
595 |
|
596 CleanupStack::PushL( tempBuf ); |
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597 TStreamEncoder streamEnc; |
|
598 TStreamDecoder streamDec; |
|
599 streamEnc.Initialize( aBuffer, byteIndex, bitIndex ); |
|
600 streamDec.Initialize( aBuffer, frameByteIndex, frameBitIndex ); |
|
601 streamDec.Decode( tempBuf, 0, 0, iTotalSpeechBits ); |
|
602 streamEnc.Encode( tempBuf, 0, 0, iTotalSpeechBits ); |
|
603 |
|
604 if ( streamEnc.BitIndex( ) != 0 ) |
|
605 { |
|
606 // Padding zeros |
|
607 streamEnc.Encode( 0, KBitsIn1Byte - streamEnc.BitIndex( ) ); |
|
608 } |
|
609 |
|
610 TInt payloadLen = streamEnc.ByteIndex( ); |
|
611 iPayloadPtr.SetLength( payloadLen ); |
|
612 |
|
613 // Finish current payload |
|
614 iFrameIndex = iRedCount; |
|
615 // Reset iFrameEncoder |
|
616 InitializeFrameEncoder( ); |
|
617 // Reset TotalSpeechBits counter |
|
618 iTotalSpeechBits = 0; |
|
619 |
|
620 CleanupStack::PopAndDestroy( tempBuf ); |
|
621 return ETrue; |
|
622 } |
|
623 |
|
624 // ----------------------------------------------------------------------------- |
|
625 // CAmrPayloadEncoder::IsStartOfPeriod |
|
626 // Returns ETrue if next frame to be encoded starts a new packetization period. |
|
627 // ----------------------------------------------------------------------------- |
|
628 // |
|
629 TBool CAmrPayloadEncoder::IsStartOfPeriod() |
|
630 { |
|
631 return ( iFrameIndex == iRedCount ); |
|
632 } |
|
633 |
|
634 // ----------------------------------------------------------------------------- |
|
635 // CAmrPayloadEncoder::EncodeTableOfContents |
|
636 // Encode 'Table of Contents' into a given buffer at the given position. |
|
637 // ----------------------------------------------------------------------------- |
|
638 // |
|
639 void CAmrPayloadEncoder::EncodeTableOfContents( TUint8* aBuffer, |
|
640 TInt& aByteIndex, |
|
641 TInt& aBitIndex ) |
|
642 { |
|
643 DP_AMR_ENCODE( "CAmrPayloadEncoder::EncodeTableOfContents" ); |
|
644 |
|
645 // Iterate iFrames array and encode each TOC entry |
|
646 // Encode TOCs for redundant frames if exist |
|
647 TInt ind( iRedCount ); |
|
648 if ( iRedIntervalCollected ) |
|
649 { |
|
650 ind = iRedCount - iFrameDatas.Count(); |
|
651 } |
|
652 |
|
653 TInt endIndex = iFramesDiscarded ? iFrameIndex - iFramesDiscarded : iFrameIndex; |
|
654 // write debug info if the endIndex is greater than the iFrames[] range |
|
655 if ( endIndex > KMaxFrameCountPerPacket ) |
|
656 { |
|
657 DP_AMR_ENCODE3("CAmrPayloadEncoder::EncodeTableOfContents, endIndex: %d > KMaxFrameCountPerPacket: %d", \ |
|
658 endIndex, KMaxFrameCountPerPacket); |
|
659 } |
|
660 for ( ; ind < endIndex; ind++ ) |
|
661 { |
|
662 if ( ind == endIndex - 1 ) |
|
663 { |
|
664 iTocEntryEncoder->iFrameFollowed = 0; // last frame in a payload |
|
665 } |
|
666 else |
|
667 { |
|
668 iTocEntryEncoder->iFrameFollowed = 1; |
|
669 } |
|
670 |
|
671 // Checking index limit to appease PC-lint |
|
672 if ( (ind) < KMaxFrameCountPerPacket ) |
|
673 { |
|
674 iTocEntryEncoder->iFrameQualityInd = iFrames[ind].iFrameQualityInd; |
|
675 iTocEntryEncoder->iFrameType = iFrames[ind].iFrameType; |
|
676 } |
|
677 iTocEntryEncoder->Encode( aBuffer, aByteIndex, aBitIndex ); |
|
678 } |
|
679 } |
|
680 |
|
681 |
|
682 // ----------------------------------------------------------------------------- |
|
683 // CAmrPayloadEncoder::InitializeFrameEncoder |
|
684 // Initialize frame encoder ( Stream Encoder ). Starting position of first AMR |
|
685 // frame data is calculated. Refer to RFC3267 4.3. |
|
686 // ----------------------------------------------------------------------------- |
|
687 // |
|
688 void CAmrPayloadEncoder::InitializeFrameEncoder( ) |
|
689 { |
|
690 DP_AMR_ENCODE( "CAmrPayloadEncoder::InitializeFrameEncoder" ); |
|
691 |
|
692 // Payload header: 4 bits; TOC: 6 bits |
|
693 // Total number of TOCs: iChannelCount * iFrameBlockCount |
|
694 TInt numOfRedFrames( 0 ); |
|
695 if ( iRedIntervalCollected ) |
|
696 { |
|
697 numOfRedFrames = iFrameDatas.Count(); |
|
698 } |
|
699 |
|
700 // Save space for frame TOCs |
|
701 TInt frameByteIndex = ( KHeaderBitsBE |
|
702 + KTOCFieldBitsBE * ( iFrameCount + numOfRedFrames ) ) / KBitsIn1Byte; |
|
703 |
|
704 TInt frameBitIndex = ( KHeaderBitsBE |
|
705 + KTOCFieldBitsBE * ( iFrameCount + numOfRedFrames ) ) % KBitsIn1Byte; |
|
706 |
|
707 iFrameEncoder.Initialize( iPayload, frameByteIndex, frameBitIndex ); |
|
708 } |
|
709 |
|
710 |
|
711 // ========================== OTHER EXPORTED FUNCTIONS ========================= |
|
712 |
|
713 // End of File |