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1 /* |
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2 * Copyright (c) 2006-2007 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 "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: DTMF RTP payload encoder for named telephone events |
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15 * and tones. |
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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 // INCLUDES |
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23 #include <mmf/server/mmfdatabuffer.h> |
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24 #include "dtmfpayloadformatdefs.h" |
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25 #include "dtmfpayloadencoder.h" |
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26 #include "dtmfeventpayloadinfo.h" |
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27 #include "dtmftonepayloadinfo.h" |
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28 #include "streamformatter.h" |
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29 |
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30 // CONSTANTS |
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31 const TInt KEventLengthInBytes = 8; |
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32 const TInt KByteIndex = 2; |
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33 const TInt KReservedBits = 4; |
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34 |
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35 #ifdef VOIP_TRACE_ENABLED |
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36 #include <voip_trace.h> |
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37 #endif |
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38 |
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39 // ======== MEMBER FUNCTIONS ======== |
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40 |
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41 |
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42 // --------------------------------------------------------------------------- |
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43 // CDTMFPayloadEncoder::CDTMFPayloadEncoder |
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44 // C++ default constructor can NOT contain any code, that |
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45 // might leave. |
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46 // --------------------------------------------------------------------------- |
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47 // |
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48 CDTMFPayloadEncoder::CDTMFPayloadEncoder() |
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49 { |
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50 } |
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51 |
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52 // --------------------------------------------------------------------------- |
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53 // CDTMFPayloadEncoder::NewL |
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54 // Two-phased constructor. |
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55 // --------------------------------------------------------------------------- |
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56 // |
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57 CDTMFPayloadEncoder* CDTMFPayloadEncoder::NewL() |
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58 { |
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59 #ifdef VOIP_TRACE_ENABLED |
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60 VoipTrace( "%x %x", MCC_TRACE, MCC_DTMF_PLF_ENC_NEWL ); |
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61 #endif |
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62 |
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63 CDTMFPayloadEncoder* self = new( ELeave ) CDTMFPayloadEncoder; |
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64 return self; |
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65 } |
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66 |
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67 // --------------------------------------------------------------------------- |
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68 // CDTMFPayloadEncoder::~CDTMFPayloadEncoder |
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69 // Destructor. |
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70 // --------------------------------------------------------------------------- |
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71 // |
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72 CDTMFPayloadEncoder::~CDTMFPayloadEncoder() |
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73 { |
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74 #ifdef VOIP_TRACE_ENABLED |
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75 VoipTrace( "%x %x", MCC_TRACE, MCC_DTMF_PLF_ENC_DESTRUCTOR ); |
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76 #endif |
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77 iEventArray.Reset(); |
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78 } |
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79 |
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80 // --------------------------------------------------------------------------- |
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81 // CDTMFPayloadEncoder::EncodeEvent |
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82 // Forms payload for named events. |
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83 // --------------------------------------------------------------------------- |
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84 // |
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85 /* |
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86 0 1 2 3 |
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87 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 |
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88 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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89 | event |E|R| volume | duration | |
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90 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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91 */ |
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92 TInt CDTMFPayloadEncoder::EncodeEvent( |
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93 const TDTMFEventPayloadInfo& aEventInfo, |
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94 CMMFBuffer* aOutputBuffer ) |
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95 { |
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96 #ifdef VOIP_TRACE_ENABLED |
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97 VoipTrace( "%x %x", MCC_TRACE, MCC_DTMF_PLF_ENC_ENCEV ); |
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98 #endif |
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99 if ( EDTMFPayloadFormatRedEvents == iPayloadFormat ) |
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100 { |
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101 return EncodeRedundantEventPayload( aEventInfo, aOutputBuffer ); |
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102 } |
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103 |
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104 if ( aOutputBuffer ) |
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105 { |
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106 // Possible events are: 0-9, * (10), # (11), A-D (12-15) |
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107 TInt eventAsInteger = EventAsInteger( aEventInfo.Event() ); |
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108 |
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109 TStreamEncoder streamEncoder; |
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110 TDes8& dataDes = |
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111 static_cast<CMMFDataBuffer*>( aOutputBuffer )->Data(); |
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112 const TUint8* seekPtr = dataDes.Ptr(); |
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113 // 32 bits |
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114 dataDes.SetLength( KEventBlockLengthInBytes ); |
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115 |
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116 streamEncoder.Initialize( const_cast<TUint8*>( seekPtr ), 0, 0 ); |
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117 |
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118 // Encode Event Field |
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119 streamEncoder.Encode( eventAsInteger, KEventFieldBits ); |
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120 |
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121 // Encode end bit for final packet. |
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122 streamEncoder.Encode( aEventInfo.EndBit(), 1 ); |
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123 |
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124 // Encode reserved bit |
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125 streamEncoder.Encode( 0, 1 ); |
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126 |
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127 // Encode volume field. Volume must be encoded only if it is relevant |
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128 // to the event. Otherwise it must be set to zero. |
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129 streamEncoder.Encode( aEventInfo.Volume(), KVolFieldBits ); |
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130 |
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131 // Encode duration field |
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132 streamEncoder.Encode( aEventInfo.Duration(), KDurationFieldBits ); |
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133 |
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134 // Update event array for redundant events encoding |
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135 iEventArray.Append( aEventInfo ); |
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136 if ( KDTMFDefaultRedundancyCount < iEventArray.Count() ) |
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137 { |
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138 iEventArray.Remove( 0 ); |
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139 } |
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140 |
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141 return KErrNone; |
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142 } |
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143 else |
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144 { |
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145 return KErrArgument; |
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146 } |
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147 } |
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148 |
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149 // --------------------------------------------------------------------------- |
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150 // CDTMFPayloadEncoder::EncodeRedundantEventPayload |
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151 // Encodes events to Event Payload Format using Multi-Event Redundancy. |
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152 // --------------------------------------------------------------------------- |
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153 // |
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154 /* |
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155 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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156 |F| block PT | timestamp offset | block length | |
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157 |1| 97 | 11200 | 4 | |
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158 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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159 |F| block PT | timestamp offset | block length | |
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160 |1| 97 | 11200 - 6400 = 4800 | 4 | |
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161 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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162 |F| Block PT | |
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163 |0| 97 | |
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164 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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165 | digit |E R| volume | duration | |
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166 | 9 |1 0| 7 | 1600 | |
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167 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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168 | digit |E R| volume | duration | |
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169 | 1 |1 0| 10 | 2000 | |
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170 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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171 | digit |E R| volume | duration | |
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172 | 1 |0 0| 20 | 400 | |
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173 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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174 */ |
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175 TInt CDTMFPayloadEncoder::EncodeRedundantEventPayload( |
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176 const TDTMFEventPayloadInfo& aEventInfo, CMMFBuffer* aOutputBuffer ) |
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177 { |
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178 #ifdef VOIP_TRACE_ENABLED |
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179 VoipTrace( "%x %x", MCC_TRACE, MCC_DTMF_PLF_ENC_ENCREDEVPL ); |
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180 #endif |
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181 if ( aOutputBuffer ) |
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182 { |
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183 TStreamEncoder streamEncoder; |
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184 TDes8& dataDes = |
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185 static_cast<CMMFDataBuffer*>( aOutputBuffer )->Data(); |
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186 const TUint8* seekPtr = dataDes.Ptr(); |
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187 |
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188 // Count length of packet. Event consists of 4 byte header and 4 byte |
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189 // payload. Length of the redundancy header of last event is one byte. |
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190 TInt length( iEventArray.Count() * KEventLengthInBytes - 3 ); |
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191 if ( length > 0 && length < dataDes.MaxSize() ) |
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192 { |
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193 dataDes.SetLength( length ); |
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194 } |
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195 |
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196 streamEncoder.Initialize( const_cast<TUint8*>( seekPtr ), 0, 0 ); |
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197 |
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198 // Update event array |
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199 iEventArray.Append( aEventInfo ); |
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200 if ( KDTMFDefaultRedundancyCount < iEventArray.Count() ) |
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201 { |
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202 iEventArray.Remove( 0 ); |
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203 } |
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204 |
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205 // Encode redundancy headers |
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206 TInt eventCount( iEventArray.Count() ); |
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207 for ( TInt i = 0; i < eventCount; i++ ) |
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208 { |
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209 if ( i != eventCount - 1 ) |
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210 { |
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211 // F-bit |
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212 streamEncoder.Encode( 1, 1 ); |
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213 streamEncoder.Encode( iPayloadType, KBlockPTBits ); |
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214 |
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215 // Encode Timestamp offset |
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216 TUint offset( iEventArray[eventCount - 1].TimeStamp().Int() |
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217 - iEventArray[i].TimeStamp().Int() ); |
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218 streamEncoder.Encode( offset, KTimeStampOffsetBits ); |
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219 |
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220 streamEncoder.Encode( KEventBlockLengthInBytes, |
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221 KBlockLengthBits ); |
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222 } |
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223 else |
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224 { |
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225 // Last redundancy header |
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226 // F-bit |
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227 streamEncoder.Encode( 0, 1 ); |
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228 streamEncoder.Encode( iPayloadType, KBlockPTBits ); |
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229 } |
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230 } |
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231 |
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232 // Encode payload blocks |
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233 for ( TInt index = 0; index < eventCount; index++ ) |
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234 { |
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235 // Possible events are: 0-9, * (10), # (11), A-D (12-15) |
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236 TInt eventAsInteger = |
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237 EventAsInteger( iEventArray[index].Event() ); |
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238 |
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239 // Encode digit field |
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240 streamEncoder.Encode( eventAsInteger, KEventFieldBits ); |
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241 |
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242 // Encode E-bit |
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243 if ( index != eventCount - 1 ) |
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244 { |
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245 streamEncoder.Encode( 1, 1 ); |
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246 } |
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247 else |
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248 { |
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249 // Last event |
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250 streamEncoder.Encode( 0, 1 ); |
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251 } |
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252 |
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253 // Encode Reserved bit |
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254 streamEncoder.Encode( 0, 1 ); |
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255 |
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256 // Encode Volume Field |
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257 streamEncoder.Encode( iEventArray[index].Volume(), |
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258 KVolFieldBits ); |
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259 |
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260 // Encode Duration Field |
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261 streamEncoder.Encode( iEventArray[index].Duration(), |
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262 KDurationFieldBits ); |
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263 } |
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264 |
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265 return KErrNone; |
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266 } |
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267 else |
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268 { |
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269 return KErrArgument; |
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270 } |
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271 } |
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272 |
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273 // --------------------------------------------------------------------------- |
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274 // CDTMFPayloadEncoder::EncodeTone |
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275 // Forms tone payload for DTMF digit. |
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276 // --------------------------------------------------------------------------- |
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277 // |
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278 /* |
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279 0 1 2 3 |
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280 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 |
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281 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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282 | modulation |T| volume | duration | |
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283 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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284 |R R R R| frequency |R R R R| frequency | |
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285 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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286 |R R R R| frequency |R R R R| frequency | |
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287 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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288 ...... |
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289 |
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290 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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291 |R R R R| frequency |R R R R| frequency | |
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292 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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293 */ |
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294 TInt CDTMFPayloadEncoder::EncodeTone( const TDTMFTonePayloadInfo& aToneInfo, |
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295 CMMFDataBuffer* aOutputBuffer ) const |
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296 { |
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297 #ifdef VOIP_TRACE_ENABLED |
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298 VoipTrace( "%x %x", MCC_TRACE, MCC_DTMF_PLF_ENC_ENCTONE ); |
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299 #endif |
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300 if ( aOutputBuffer ) |
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301 { |
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302 TInt toneAsInteger = EventAsInteger( aToneInfo.Tone() ); |
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303 if ( toneAsInteger < 0 || toneAsInteger >= KDtmfGroupFrequencyCount ) |
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304 { |
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305 return KErrArgument; |
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306 } |
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307 TUint lowGroupFrequency( KDTMFLowGroupFrequencies[ toneAsInteger ] ); |
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308 TUint highGroupFrequency( |
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309 KDTMFHighGroupFrequencies[ toneAsInteger ] ); |
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310 |
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311 TStreamEncoder streamEncoder; |
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312 TDes8& dataDes = |
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313 STATIC_CAST( CMMFDataBuffer*, aOutputBuffer )->Data(); |
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314 const TUint8* seekPtr = dataDes.Ptr(); |
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315 // 2 * 32 bits |
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316 dataDes.SetLength( KEventLengthInBytes ); |
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317 |
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318 streamEncoder.Initialize( const_cast<TUint8*>( seekPtr ), 0, 0 ); |
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319 |
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320 // Encode modulation field |
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321 streamEncoder.Encode( aToneInfo.Modulation(), KModulationBits ); |
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322 |
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323 // Encode T bit |
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324 streamEncoder.Encode( 0, 1 ); |
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325 |
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326 // Encode Volume Field |
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327 streamEncoder.Encode( aToneInfo.Volume(), KVolFieldBits ); |
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328 |
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329 // Encode Duration Field |
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330 streamEncoder.Encode( aToneInfo.Duration(), KDurationFieldBits ); |
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331 |
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332 // Encode four R(eserved) bits |
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333 streamEncoder.Encode( 0, KReservedBits ); |
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334 |
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335 // Encode first Frequency Field |
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336 streamEncoder.Encode( lowGroupFrequency, KFrequencyBits ); |
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337 |
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338 // Encode four R(eserved) bits |
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339 streamEncoder.Encode( 0, KReservedBits ); |
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340 |
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341 // Encode second Frequency Field |
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342 streamEncoder.Encode( highGroupFrequency, KFrequencyBits ); |
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343 |
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344 return KErrNone; |
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345 } |
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346 else |
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347 { |
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348 return KErrArgument; |
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349 } |
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350 } |
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351 |
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352 // --------------------------------------------------------------------------- |
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353 // CDTMFPayloadEncoder::UpdateEventPayload |
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354 // Updates previously created event payload according to parameters. |
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355 // --------------------------------------------------------------------------- |
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356 // |
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357 TInt CDTMFPayloadEncoder::UpdateEventPayload( const TBool aFinalPacket, |
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358 const TUint aDuration, |
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359 CMMFDataBuffer* aOutputBuffer ) const |
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360 { |
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361 #ifdef VOIP_TRACE_ENABLED |
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362 VoipTrace( "%x %x", MCC_TRACE, MCC_DTMF_PLF_ENC_UPDEVPL ); |
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363 #endif |
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364 if ( aOutputBuffer ) |
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365 { |
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366 TStreamEncoder streamEncoder; |
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367 TDes8& dataDes = STATIC_CAST( CMMFDataBuffer*, |
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368 aOutputBuffer )->Data(); |
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369 const TUint8* seekPtr = dataDes.Ptr(); |
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370 |
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371 // End bit starts from the beginning of second byte |
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372 streamEncoder.Initialize( const_cast<TUint8*>( seekPtr ), 1, 0 ); |
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373 |
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374 // Encode End Bit |
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375 if ( aFinalPacket ) |
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376 { |
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377 streamEncoder.Encode( 1, 1 ); |
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378 } |
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379 |
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380 // Duration Field starts from third byte |
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381 streamEncoder.SetBitIndex( 0 ); |
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382 streamEncoder.SetByteIndex( KByteIndex ); |
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383 |
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384 // Encode Duration Field with new value |
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385 streamEncoder.Encode( aDuration, KDurationFieldBits ); |
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386 |
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387 return KErrNone; |
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388 } |
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389 else |
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390 { |
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391 return KErrArgument; |
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392 } |
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393 } |
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394 |
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395 |
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396 // --------------------------------------------------------------------------- |
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397 // CDTMFPayloadEncoder::UpdateTonePayload |
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398 // Updates previously created tone payload according to parameters. |
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399 // --------------------------------------------------------------------------- |
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400 // |
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401 TInt CDTMFPayloadEncoder::UpdateTonePayload( const TUint aToneDuration, |
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402 CMMFDataBuffer* aOutputBuffer ) const |
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403 { |
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404 #ifdef VOIP_TRACE_ENABLED |
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405 VoipTrace( "%x %x", MCC_TRACE, MCC_DTMF_PLF_ENC_UPDTONEPL ); |
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406 #endif |
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407 |
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408 if ( aOutputBuffer ) |
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409 { |
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410 TStreamEncoder streamEncoder; |
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411 TDes8& dataDes = STATIC_CAST( CMMFDataBuffer*, |
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412 aOutputBuffer )->Data(); |
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413 const TUint8* seekPtr = dataDes.Ptr(); |
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414 |
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415 // Duration Field starts from third byte |
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416 streamEncoder.Initialize( const_cast<TUint8*>( seekPtr ), 3, 0 ); |
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417 |
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418 // Encode Duration Field with a new value |
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419 streamEncoder.Encode( aToneDuration, KDurationFieldBits ); |
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420 |
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421 return KErrNone; |
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422 } |
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423 else |
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424 { |
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425 return KErrArgument; |
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426 } |
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427 } |
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428 |
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429 // --------------------------------------------------------------------------- |
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430 // CDTMFPayloadEncoder::PayloadFormat |
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431 // Returns payload format in use. |
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432 // --------------------------------------------------------------------------- |
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433 // |
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434 TDTMFPayloadFormat CDTMFPayloadEncoder::PayloadFormat( ) const |
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435 { |
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436 return iPayloadFormat; |
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437 } |
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438 |
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439 // --------------------------------------------------------------------------- |
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440 // CDTMFPayloadEncoder::SetPayloadFormat |
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441 // Sets payload format in use. |
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442 // --------------------------------------------------------------------------- |
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443 // |
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444 TInt CDTMFPayloadEncoder::SetPayloadFormat( |
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445 TDTMFPayloadFormat aPayloadFormat ) |
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446 { |
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447 #ifdef VOIP_TRACE_ENABLED |
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448 VoipTrace( "%x %x %d", MCC_TRACE, MCC_DTMF_PLF_ENC_SETPLF, aPayloadFormat ); |
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449 #endif |
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450 |
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451 if ( EDTMFPayloadFormatEvent != aPayloadFormat |
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452 && EDTMFPayloadFormatTone != aPayloadFormat |
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453 && EDTMFPayloadFormatRedEvents != aPayloadFormat ) |
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454 { |
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455 return KErrNotSupported; |
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456 } |
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457 else |
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458 { |
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459 iPayloadFormat = aPayloadFormat; |
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460 } |
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461 |
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462 return KErrNone; |
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463 } |
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464 |
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465 // --------------------------------------------------------------------------- |
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466 // CDTMFPayloadEncoder::PayloadType |
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467 // Returns payload type in use. |
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468 // --------------------------------------------------------------------------- |
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469 // |
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470 TUint8 CDTMFPayloadEncoder::PayloadType( ) const |
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471 { |
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472 return iPayloadType; |
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473 } |
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474 |
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475 // --------------------------------------------------------------------------- |
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476 // CDTMFPayloadEncoder::SetPayloadType |
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477 // Sets payload type in use. |
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478 // --------------------------------------------------------------------------- |
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479 // |
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480 void CDTMFPayloadEncoder::SetPayloadType( TUint8 aPayloadType ) |
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481 { |
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482 iPayloadType = aPayloadType; |
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483 } |
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484 |
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485 // --------------------------------------------------------------------------- |
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486 // CDTMFPayloadEncoder::EventAsInteger |
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487 // Converts DTMF digit / Tone represented as TChar to the integer encoding |
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488 // used in payload. |
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489 // --------------------------------------------------------------------------- |
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490 // |
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491 TInt CDTMFPayloadEncoder::EventAsInteger( const TChar& aEvent ) const |
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492 { |
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493 TInt returnValue( KErrNotFound ); |
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494 |
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495 // Conversion because of PC_LINT warning #1561 |
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496 TChar argument( aEvent ); |
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497 // For PC_LINT error #1023 |
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498 TUint nullChar( '0' ); |
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499 |
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500 if ( '0' <= aEvent && '9' >= aEvent ) |
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501 { |
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502 returnValue = argument - nullChar; |
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503 } |
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504 else |
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505 { |
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506 switch ( aEvent ) |
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507 { |
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508 case '*': |
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509 returnValue = KEventCodeForAsterisk; |
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510 break; |
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511 case '#': |
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512 returnValue = KEventCodeForHashMark; |
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513 break; |
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514 case 'a': |
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515 case 'A': |
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516 returnValue = KEventCodeForA; |
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517 break; |
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518 case 'b': |
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519 case 'B': |
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520 returnValue = KEventCodeForB; |
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521 break; |
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522 case 'c': |
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523 case 'C': |
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524 returnValue = KEventCodeForC; |
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525 break; |
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526 case 'd': |
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527 case 'D': |
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528 returnValue = KEventCodeForD; |
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529 break; |
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530 default: |
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531 break; |
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532 } |
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533 } |
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534 |
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535 return returnValue; |
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536 } |
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537 |
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538 // End of File |