1 /* |
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2 * Copyright (c) 2010 Ixonos Plc. |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of the "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 * Ixonos Plc |
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14 * |
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15 * Description: |
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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 #ifndef __CRateConverter_H__ |
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22 #define __CRateConverter_H__ |
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23 |
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24 #include <e32base.h> |
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25 |
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26 #include "resampler_rate_conversion_input_driven_int16.h" |
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27 |
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28 class CRateConverter : public CBase |
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29 { |
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30 |
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31 public: |
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32 |
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33 /* |
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34 * Symbian constructors |
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35 * |
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36 */ |
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37 static CRateConverter* NewL(TInt aFromSampleRate, TInt aToSampleRate, TInt aFromChannels, TInt aToChannels); |
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38 |
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39 static CRateConverter* NewLC(TInt aFromSampleRate, TInt aToSampleRate, TInt aFromChannels, TInt aToChannels); |
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40 |
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41 /* |
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42 * Destructor |
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43 */ |
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44 ~CRateConverter(); |
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45 |
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46 /* |
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47 * Initialize the rate converter |
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48 * |
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49 * @param aInputBufferSize Max size of the input buffer in number of samples |
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50 * @return ETrue if successful |
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51 * |
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52 */ |
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53 TBool InitL(TInt aInputBufferSize); |
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54 |
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55 /* |
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56 * Does rate and channel conversion for given buffer |
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57 * |
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58 * @param aInput Pointer to input buffer (16-bit samples) |
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59 * @param aOutput Pointer to output buffer (16-bit samples) |
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60 * @param aInputSampleCount Number of samples in the input buffer |
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61 * @return Number of samples in the output buffer |
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62 */ |
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63 TInt ConvertBufferL(TInt16* aInput, TInt16* aOutput, TInt aInputSampleCount); |
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64 |
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65 /* |
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66 * Returns the size of the output buffer |
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67 * |
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68 */ |
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69 TInt GetOutputBufferSize() { return iOuputBlockSize; } |
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70 |
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71 |
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72 protected: |
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73 |
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74 // constructL |
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75 void ConstructL(); |
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76 |
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77 // C++ constructor |
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78 CRateConverter(TInt aFromSampleRate, TInt aToSampleRate, TInt aFromChannels, TInt aToChannels); |
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79 |
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80 private: |
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81 |
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82 /* |
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83 * Does internal initialization |
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84 * |
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85 */ |
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86 TBool DoInitL(TInt aInputBufferSize); |
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87 |
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88 /* |
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89 * Does the actual conversion |
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90 * |
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91 */ |
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92 TInt DoConvertL(TInt16** aInput, TInt aInputSampleCount); |
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93 |
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94 /* |
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95 * Returns pointer to the output buffer |
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96 * |
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97 */ |
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98 TInt16** GetOutputBuffer() { return iOutBuffer; } |
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99 |
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100 private: |
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101 |
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102 // Another converter incase two phase converting is needed |
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103 CRateConverter* iChild; |
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104 |
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105 // The actual converter |
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106 RESAMPLER_RateConversionInputDrivenInt16* iConverter; |
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107 |
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108 // Input data for rate converter |
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109 TInt16** iInBuffer; |
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110 |
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111 // Output data from rate converter |
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112 TInt16** iOutBuffer; |
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113 |
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114 // Temp buffer used by converter |
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115 TInt8* iScratchBuffer; |
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116 |
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117 // Size of the input buffer |
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118 TInt iInputBlockSize; |
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119 |
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120 // Size of the output buffer |
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121 TInt iOuputBlockSize; |
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122 |
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123 // Number of channels used in converter |
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124 TInt iChannels; |
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125 |
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126 // Samplerate to convert from |
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127 TInt iFromSampleRate; |
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128 |
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129 // Samplerate to convert to |
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130 TInt iToSampleRate; |
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131 |
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132 // Number of channels in input |
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133 TInt iFromChannels; |
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134 |
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135 // Number of channels in output |
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136 TInt iToChannels; |
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137 }; |
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138 |
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139 #endif |
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