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1 // Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of "Eclipse Public License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // |
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13 // Description: |
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14 // ToneGenerator.h |
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15 // |
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16 // |
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17 |
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18 #ifndef __TONEGENERATOR_H__ |
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19 #define __TONEGENERATOR_H__ |
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20 |
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21 #include <e32base.h> |
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22 |
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23 // |
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24 // Sine tone generator |
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25 // |
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26 |
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27 const TInt KMaxSineTable = 256; |
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28 const TUint KToneBufferSize = 8192; |
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29 |
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30 // one second in microseconds |
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31 const TInt KOneMillionMicroSeconds = 1000000; |
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32 |
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33 |
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34 class TSineGen |
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35 /** |
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36 *@internalTechnology |
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37 */ |
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38 { |
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39 public: |
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40 void SetFrequency(TInt aFrequency,TInt aAmplitude); |
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41 TInt NextSample(); |
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42 private: |
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43 TUint iPosition; |
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44 TUint iStep; |
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45 TInt iAmplitude; |
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46 static const TInt16 SineTable[KMaxSineTable]; |
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47 static const TInt16 IncTable[KMaxSineTable]; |
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48 }; |
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49 |
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50 class TSineWave |
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51 /** |
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52 *@internalTechnology |
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53 */ |
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54 { |
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55 public: |
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56 void Generate(TInt16* aDest,TInt aCount); |
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57 void SetFrequency(TInt aFrequency,TInt aAmplitude); |
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58 void SetFrequency(TInt aFrequency1,TInt aAmplitude1,TInt aFrequency2,TInt aAmplitude2); |
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59 private: |
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60 TSineGen iGen1; |
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61 TSineGen iGen2; |
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62 }; |
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63 |
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64 // |
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65 // Tone synthesis interface |
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66 // Defines the abstract interface for tone synthesis |
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67 // Capable of filling buffers with audio data |
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68 // |
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69 |
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70 class MMdaToneSynthesis |
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71 /** |
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72 *@internalTechnology |
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73 */ |
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74 { |
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75 public: |
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76 // Allocate necessary resources for this kind of synthesis |
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77 virtual void Configure(TInt aRate, TInt aChannels, TInt aRepeats, TInt aSilence, TInt aRampUp)=0; |
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78 // Begin generating data from start again |
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79 virtual void Reset()=0; |
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80 // Fill supplied buffer with next block of 16bit PCM audio data |
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81 virtual TInt FillBuffer(TDes8& aBuffer)=0; |
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82 }; |
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83 |
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84 // |
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85 // Tone generator base class |
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86 // |
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87 |
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88 class TMdaToneGenerator : public MMdaToneSynthesis |
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89 { |
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90 public: |
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91 virtual void Configure(TInt aRate, TInt aChannels, TInt aRepeats, TInt aSilence, TInt aRampUp); |
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92 virtual TInt FillBuffer(TDes8& aBuffer); |
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93 protected: |
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94 virtual TInt GetNextTone()=0; |
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95 // |
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96 TInt DurationToSamples(const TTimeIntervalMicroSeconds& aDuration); |
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97 protected: |
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98 TSineWave iSineWave; |
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99 TInt iRate; |
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100 TInt iChannels; |
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101 TInt iSamplesLeft; |
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102 TInt iTrailingSilence; |
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103 TBool iRampUp; |
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104 TBool iRampDown; |
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105 TInt iRepeats; |
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106 TInt iSilenceBetweenRepeats; |
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107 TBool iAfterRepeatSilence; |
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108 TInt iRampUpCount; |
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109 TInt iRampUpLeft; |
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110 }; |
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111 |
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112 // |
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113 // Simple tone synthesis |
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114 // |
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115 |
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116 class TMdaSimpleToneGenerator : public TMdaToneGenerator |
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117 /** |
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118 *@internalTechnology |
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119 */ |
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120 { |
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121 public: |
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122 void SetFrequencyAndDuration(TInt aFrequency, const TTimeIntervalMicroSeconds& aDuration); |
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123 virtual void Reset(); |
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124 virtual TInt GetNextTone(); |
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125 private: |
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126 TTimeIntervalMicroSeconds iDuration; |
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127 TInt iFrequency; |
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128 TBool iPlayed; |
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129 }; |
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130 |
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131 |
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132 /** |
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133 * Dual tone synthesis |
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134 * Generates a tone consisting of two sine waves of different |
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135 * frequencies summed together. |
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136 * |
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137 * @internalTechnology |
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138 */ |
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139 class TMdaDualToneGenerator : public TMdaToneGenerator |
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140 { |
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141 public: |
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142 void SetFrequencyAndDuration(TInt aFrequencyOne, TInt aFrequencyTwo, const TTimeIntervalMicroSeconds& aDuration); |
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143 virtual void Reset(); |
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144 virtual TInt GetNextTone(); |
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145 private: |
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146 TTimeIntervalMicroSeconds iDuration; |
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147 TInt iFrequencyOne; |
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148 TInt iFrequencyTwo; |
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149 TBool iPlayed; |
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150 }; |
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151 |
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152 // |
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153 // DTMF tone synthesis |
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154 // |
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155 |
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156 class TMdaDTMFGenerator : public TMdaToneGenerator |
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157 /** |
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158 *@internalTechnology |
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159 */ |
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160 { |
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161 public: |
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162 virtual void Reset(); |
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163 void SetToneDurations( const TTimeIntervalMicroSeconds32 aOn, |
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164 const TTimeIntervalMicroSeconds32 aOff, |
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165 const TTimeIntervalMicroSeconds32 aPause); |
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166 void SetString(const TDesC& aDTMFString); |
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167 private: |
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168 virtual TInt GetNextTone(); |
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169 private: |
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170 const TDesC* iDTMFString; |
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171 TTimeIntervalMicroSeconds32 iOn; |
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172 TTimeIntervalMicroSeconds32 iOff; |
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173 TTimeIntervalMicroSeconds32 iPause; |
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174 TInt iOnSamples; |
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175 TInt iOffSamples; |
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176 TInt iPauseSamples; |
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177 TInt iChar; |
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178 TBool iPlayToneOff; |
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179 }; |
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180 |
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181 // |
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182 // Tone sequence synthesis |
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183 // |
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184 |
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185 const TInt KMaxSequenceStack = 6; |
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186 class TMdaSequenceGenerator : public TMdaToneGenerator |
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187 /** |
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188 *@internalTechnology |
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189 */ |
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190 { |
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191 public: |
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192 virtual void Reset(); |
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193 void SetSequenceData(const TDesC8& aSequenceData); |
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194 private: |
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195 virtual TInt GetNextTone(); |
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196 private: |
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197 const TDesC8* iSequenceData; |
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198 const TInt16* iInstructionPtr; |
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199 const TInt16* iLastInstruction; |
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200 TInt iStack[KMaxSequenceStack]; |
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201 TInt iStackIndex; |
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202 }; |
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203 |
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204 const TInt KBufferLength = 0x1000; |
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205 |
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206 // Public Media Server includes |
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207 |
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208 class TMdaPtr8 : public TPtr8 //needed for this WINS Impl of Tone Gen |
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209 { |
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210 public: |
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211 TMdaPtr8() |
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212 : TPtr8(0,0,0) {}; |
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213 inline void Set(const TDes8& aDes) |
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214 { TPtr8::Set((TUint8*)(aDes.Ptr()),aDes.Length(),aDes.MaxLength()); }; |
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215 inline void SetLengthOnly(const TDes8& aDes) |
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216 { TPtr8::Set((TUint8*)(aDes.Ptr()),aDes.Length(),aDes.Length()); }; |
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217 inline void Set(const TPtrC8& aDes) |
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218 { TPtr8::Set((TUint8*)(aDes.Ptr()),aDes.Length(),aDes.Length()); }; |
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219 inline void Shift(TInt aOffset) |
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220 { SetLength(Length()-aOffset); iMaxLength-=aOffset; iPtr+=aOffset; }; |
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221 }; |
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222 |
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223 |
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224 #endif |