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1 /* |
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2 * Copyright (c) 2003-2009 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: |
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15 * Name : SdpFmtAttributeField.h |
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16 * Part of : SDP Codec |
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17 * Interface : SDK API, SDP Codec API |
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18 * Version : 1.0 |
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19 * |
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20 */ |
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21 |
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22 |
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23 |
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24 #ifndef CSDPFMTATTRIBUTEFIELD_H |
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25 #define CSDPFMTATTRIBUTEFIELD_H |
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26 |
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27 // INCLUDES |
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28 #include <e32base.h> |
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29 #include <stringpool.h> |
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30 |
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31 // FORWARD DECLARATIONS |
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32 class RReadStream; |
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33 class RWriteStream; |
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34 class CSdpAttributeField; |
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35 class TSdpRtpmapValue; |
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36 |
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37 // CLASS DECLARATION |
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38 /** |
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39 * @publishedAll |
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40 * @released |
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41 * |
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42 * This class encapsulates the attribute field of the Session Description |
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43 * Protocol for media format/payload type level attributes. Media and session |
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44 * level attributes are supported by the CSdpAttributeField class. |
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45 * |
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46 * The normative reference for correct formatting and values is |
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47 * draft-ietf-mmusic-sdp-new-14 unless specified otherwise in |
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48 * member documentation. The implementation supports this normative |
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49 * reference, but does not enforce it fully. |
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50 * |
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51 * @lib sdpcodec.lib |
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52 */ |
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53 class CSdpFmtAttributeField : public CBase |
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54 { |
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55 public: // Constructors and destructor |
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56 /** |
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57 * Constructs a new media format level attribute field. |
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58 * |
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59 * @param aText A string containing a correctly |
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60 * formatted field value terminated by a CRLF. |
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61 * @return a new instance. |
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62 */ |
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63 IMPORT_C static CSdpFmtAttributeField* DecodeL( const TDesC8& aText ); |
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64 |
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65 /** |
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66 * Constructs a new media format level attribute field and adds the |
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67 * pointer to the cleanup stack. |
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68 * |
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69 * @param aText A string containing a correctly |
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70 * formatted field value terminated by a CRLF. |
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71 * @return a new instance. |
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72 */ |
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73 IMPORT_C static CSdpFmtAttributeField* DecodeLC( const TDesC8& aText); |
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74 |
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75 /** |
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76 * Constructs a new media level format attribute field. |
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77 * |
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78 * @param aAttribute The attribute name. It can be a pre-defined |
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79 * name in the SDP string pool or defined by the client. |
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80 * @param aFormat A valid format/payload identifier |
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81 * used in the format list of the media description. |
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82 * @param aValue A valid attribute value or an empty |
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83 * descriptor to omit the value part. |
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84 * @return a new instance. |
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85 */ |
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86 IMPORT_C static CSdpFmtAttributeField* NewL( |
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87 RStringF aAttribute, const TDesC8& aFormat, const TDesC8& aValue ); |
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88 |
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89 /** |
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90 * Constructs a new media format level attribute field and adds the |
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91 * pointer to the cleanup stack. |
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92 * |
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93 * @param aAttribute The attribute name. It can be a pre-defined |
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94 * name in the SDP string pool or defined by the client. |
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95 * @param aFormat A valid format/payload identifier |
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96 * used in the format list of the media description. |
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97 * @param aValue A valid attribute value or an empty |
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98 * descriptor to omit the value part. |
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99 * @return a new instance. |
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100 */ |
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101 IMPORT_C static CSdpFmtAttributeField* NewLC( |
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102 RStringF aAttribute, const TDesC8& aFormat, const TDesC8& aValue ); |
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103 |
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104 /** |
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105 * Deletes the resources held by the instance. |
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106 */ |
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107 IMPORT_C ~CSdpFmtAttributeField(); |
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108 |
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109 public: // New functions |
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110 |
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111 /** |
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112 * Outputs the field formatted according to SDP syntax and including |
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113 * the terminating CRLF. |
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114 * |
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115 * @param aStream Stream used for output. On return |
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116 * the stream includes correctly formatted attribute field. |
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117 */ |
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118 IMPORT_C void EncodeL( RWriteStream& aStream ) const; |
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119 |
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120 /** |
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121 * Creates a new instance that is equal to the target. |
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122 * |
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123 * @return a new instance. |
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124 */ |
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125 IMPORT_C CSdpFmtAttributeField * CloneL() const; |
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126 |
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127 /** |
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128 * Compares this instance to another for equality. |
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129 * |
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130 * @param aObj The instance to compare to. |
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131 * @return ETrue if equal, EFalse if not. |
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132 */ |
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133 IMPORT_C TBool operator== ( const CSdpFmtAttributeField& aObj ) const; |
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134 |
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135 /** |
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136 * Gets the attribute. |
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137 * |
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138 * @return The attribute name. The name can be pre-defined |
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139 * name in the SDP string table or defined by the client. |
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140 */ |
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141 IMPORT_C RStringF Attribute() const; |
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142 |
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143 /** |
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144 * Gets the format. |
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145 * |
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146 * @return The format. |
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147 */ |
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148 IMPORT_C const TDesC8& Format() const; |
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149 |
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150 /** |
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151 * Gets the attribute value. |
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152 * |
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153 * @return The value or an empty descriptor if there is no value part. |
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154 */ |
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155 IMPORT_C const TDesC8& Value() const; |
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156 |
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157 /** |
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158 * Sets the attribute, format/payload type and attribute value. |
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159 * |
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160 * @param aAttribute A valid attribute name. It can be a |
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161 * pre-defined name in the SDP string pool or defined by |
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162 * the client. |
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163 * @param aFormat A valid format/payload identifier |
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164 * used in the formatlist of the media description. |
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165 * @param aValue A valid attribute value or an empty |
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166 * descriptor to omit the value part. |
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167 * @leave KErrSdpCodecMediaAttributeField if aAttribute is not rtpmap |
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168 * or fmtp attribute. |
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169 */ |
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170 IMPORT_C void SetL( |
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171 RStringF aAttribute, const TDesC8& aFormat, const TDesC8& aValue ); |
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172 |
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173 public: // Internal to codec |
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174 |
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175 /** |
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176 * Externalizes the object to stream |
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177 * |
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178 * @param aStream Stream where the object's state will be stored |
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179 */ |
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180 void ExternalizeL( RWriteStream& aStream ) const; |
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181 |
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182 /** |
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183 * Creates object from the stream data |
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184 * |
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185 * @param aStream Stream where the object's state will be read |
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186 * @return Initialized object |
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187 */ |
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188 static CSdpFmtAttributeField* InternalizeL( RReadStream& aStream ); |
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189 |
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190 /** |
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191 * Returns attribute field |
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192 * |
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193 * @return Attribute field |
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194 */ |
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195 const CSdpAttributeField* AttributeField() const; |
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196 |
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197 private: // New methods |
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198 |
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199 /** |
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200 * Creates object from the stream data. |
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201 * Does the "2nd phase construction" of internalization. |
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202 * |
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203 * @param aStream Stream where the object's state will be read |
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204 */ |
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205 void DoInternalizeL( RReadStream& aStream ); |
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206 |
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207 /** |
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208 * Formats value parameters |
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209 * |
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210 * @param aField Attribute field object |
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211 */ |
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212 void FormatValueParamsL( CSdpAttributeField* aField ); |
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213 |
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214 private: // Construction and destruction |
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215 |
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216 /** |
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217 * Constructor |
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218 */ |
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219 CSdpFmtAttributeField(); |
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220 |
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221 /** |
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222 * Second phase construction |
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223 * |
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224 * @param aText A string containing a correctly formatted field value |
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225 * terminated by a CRLF. |
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226 */ |
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227 void ConstructL( const TDesC8& aText ); |
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228 |
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229 /** |
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230 * Second phase construction |
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231 * |
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232 * @param aAttribute The attribute from the pre-defined SDP string |
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233 * table or defined by the user |
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234 * @param aFormat A valid format/payload identifier used in the format |
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235 * list of the media description. |
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236 * @param aValue A valid attribute value or an empty descriptor |
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237 * to omit the value part. |
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238 */ |
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239 void ConstructL( |
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240 RStringF aAttribute, const TDesC8& aFormat, const TDesC8& aValue ); |
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241 |
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242 |
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243 /** |
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244 * Decode format parameter from string |
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245 * |
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246 * @param aText A text includeing format parameter. |
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247 */ |
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248 void DecodeFormatL(const TDesC8& aText); |
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249 |
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250 void __DbgTestInvariant() const; |
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251 |
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252 |
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253 private: |
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254 |
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255 RStringPool iPool; |
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256 CSdpAttributeField* iAttributeField; |
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257 /** Pointer to the format part*/ |
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258 TPtrC8 iFormat; |
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259 /** Pointer to the format parameters*/ |
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260 TPtrC8 iValuePart; |
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261 }; |
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262 |
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263 #endif // CSDPFMTATTRIBUTEFIELD_H |