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1 #ifndef __RESAMPLER_SINC_CONV_44_TO_48_INT16_H__ |
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2 #define __RESAMPLER_SINC_CONV_44_TO_48_INT16_H__ |
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3 /* |
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4 * Copyright (c) 2010 Ixonos Plc. |
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5 * All rights reserved. |
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6 * This component and the accompanying materials are made available |
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7 * under the terms of the "Eclipse Public License v1.0" |
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8 * which accompanies this distribution, and is available |
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9 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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10 * |
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11 * Initial Contributors: |
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12 * Nokia Corporation - Initial contribution |
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13 * |
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14 * Contributors: |
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15 * Ixonos Plc |
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16 * |
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17 * Description: |
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18 * |
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19 */ |
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20 |
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21 |
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22 #include "resampler_rate_conversion_input_driven_int16.h" |
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23 #include "resampler_rate_conversion_output_driven_int16.h" |
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24 |
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25 /** @ingroup rate_conversion |
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26 |
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27 Class for upsampling 16-bit audio from 44.1 kHz to 48kHz |
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28 |
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29 */ |
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30 |
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31 class RESAMPLER_SincConv44To48Int16 : public RESAMPLER_RateConversionInputDrivenInt16, |
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32 public RESAMPLER_RateConversionOutputDrivenInt16 |
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33 { |
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34 friend class RESAMPLER_RateConversionInputDrivenInt16; |
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35 friend class RESAMPLER_RateConversionOutputDrivenInt16; |
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36 |
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37 public: |
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38 |
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39 /** @name Destruction */ |
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40 |
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41 //@{ |
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42 |
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43 /** Destructor |
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44 */ |
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45 |
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46 virtual ~RESAMPLER_SincConv44To48Int16(); |
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47 |
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48 //@} |
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49 |
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50 /** @name Query methods */ |
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51 |
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52 //@{ |
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53 |
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54 static bool RateSupported(float inRate, float outRate) |
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55 { return (160 * inRate == 147 * outRate); } |
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56 |
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57 //@} |
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58 |
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59 /** @name Object lifetime methods */ |
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60 |
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61 //@{ |
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62 |
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63 /** Initializes the converter. |
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64 |
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65 This method initializes the sampling rate converter for input-driven |
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66 operation. |
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67 |
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68 @return true if successful false otherwise |
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69 */ |
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70 |
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71 virtual bool InitInputDriven(); |
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72 |
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73 /** Initializes the converter. |
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74 |
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75 This method initializes the sampling rate converter. The |
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76 initialization will be successful only if 3*inRate == outRate. |
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77 |
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78 @return true if successful false otherwise |
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79 */ |
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80 |
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81 virtual bool InitOutputDriven(); |
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82 |
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83 //@} |
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84 |
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85 /** @name Output-driven operation */ |
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86 |
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87 //@{ |
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88 |
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89 /** Set the quality mode for the subsequent operations */ |
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90 |
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91 virtual bool SetQualityOutputDriven(int mode); |
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92 |
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93 /** Set the quality mode for the subsequent operations */ |
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94 |
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95 virtual bool SetQualityInputDriven(int mode); |
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96 |
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97 /** Enable one of the channels. |
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98 |
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99 This method is used to (re-)enable a rate conversion channel after it's |
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100 been disabled. (All channels start in the enabled mode.) This is used to |
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101 tell the algorithm that the channel must be properly processed, if the |
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102 algorithm wants to take advantage of the optimization possibilities |
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103 provided by the DisableInputDriven() method. |
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104 |
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105 @note The channel index MUST be valid, i.e., it has to be smaller than |
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106 @c numChannels given at initialization time. |
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107 |
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108 @param[in] channel The index of the channel to be enabled. |
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109 */ |
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110 |
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111 virtual void EnableChannelInputDriven(int channel); |
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112 |
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113 /** Disable one of the channels. |
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114 |
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115 This method can be used to tell the algorithm that the output from a |
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116 specific channel will not be used in subsequent operations, and the |
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117 implementation may choose to optimize and leave the disabled channel |
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118 unprocessed. However, the caller must always provide valid pointers for |
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119 the actual processing methods for the case where it's difficult to |
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120 actually disable memory access for the specific channel in an |
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121 implementation. |
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122 |
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123 @note The channel index MUST be valid, i.e., it has to be smaller than |
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124 @c numChannels given at initialization time. |
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125 |
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126 @param[in] channel The index of the channel to be enabled. |
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127 */ |
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128 |
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129 virtual void DisableChannelInputDriven(int channel); |
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130 |
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131 /** Enable one of the channels. |
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132 |
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133 This method is used to (re-)enable a rate conversion channel after it's |
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134 been disabled. (All channels start in the enabled mode.) This is used to |
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135 tell the algorithm that the channel must be properly processed, if the |
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136 algorithm wants to take advantage of the optimization possibilities |
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137 provided by the DisableInputDriven() method. |
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138 |
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139 @note The channel index MUST be valid, i.e., it has to be smaller than |
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140 @c numChannels given at initialization time. |
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141 |
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142 @param[in] channel The index of the channel to be enabled. |
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143 */ |
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144 |
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145 virtual void EnableChannelOutputDriven(int channel); |
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146 |
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147 /** Disable one of the channels. |
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148 |
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149 This method can be used to tell the algorithm that the output from a |
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150 specific channel will not be used in subsequent operations, and the |
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151 implementation may choose to optimize and leave the disabled channel |
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152 unprocessed. However, the caller must always provide valid pointers for |
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153 the actual processing methods for the case where it's difficult to |
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154 actually disable memory access for the specific channel in an |
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155 implementation. |
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156 |
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157 @note The channel index MUST be valid, i.e., it has to be smaller than |
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158 @c numChannels given at initialization time. |
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159 |
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160 @param[in] channel The index of the channel to be enabled. |
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161 */ |
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162 |
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163 virtual void DisableChannelOutputDriven(int channel); |
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164 |
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165 /** Query the scratch memory need of the converter. |
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166 |
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167 This method queries the amount of scratch memory the input driven converter |
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168 needs to be able to handle in a single call to the processing functions. |
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169 |
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170 @param[in] maxInputBlockSize Maximum input blocksize |
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171 @return memory need in bytes |
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172 */ |
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173 |
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174 virtual size_t ScratchMemoryNeedInputDriven(int maxInputBlockSize) const; |
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175 |
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176 /** Set scratch buffer for the converter |
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177 |
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178 This method sets scratch buffer needed by the converter when the converter is |
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179 used in output driven mode. . The caller of this function is responsible of |
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180 allocating enough memory. |
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181 |
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182 @param[in] *buffer pointer to the allocated buffer |
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183 */ |
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184 |
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185 virtual void SetScratchBufferInputDriven(char *buffer); |
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186 |
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187 /** Query the scratch memory need of the converter. |
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188 |
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189 This method queries the amount of scratch memory the output driven converter |
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190 needs to be able to handle in a single call to the processing functions. |
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191 |
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192 @param[in] maxOutputBlockSize Maximum output blocksize |
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193 @return memory need in bytes |
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194 */ |
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195 |
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196 virtual size_t ScratchMemoryNeedOutputDriven(int maxOutputBlockSize) const; |
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197 |
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198 /** Set scratch buffer for the converter |
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199 |
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200 This method sets scratch buffer needed by the converter when then converter is |
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201 used in output driven mode. The caller of this function is responsible of |
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202 allocating enough memory. |
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203 |
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204 @param[in] *buffer pointer to the allocated buffer |
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205 */ |
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206 |
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207 virtual void SetScratchBufferOutputDriven(char *buffer); |
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208 |
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209 /** Get the maximum number of input samples needed. |
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210 |
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211 This method returns the maximum number of input samples needed |
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212 for a given output sample count. |
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213 |
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214 @param[in] outSamples Number of output samples |
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215 @return Maximum number of input samples |
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216 */ |
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217 |
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218 virtual int MaxInputSampleCount(int outSamples) const; |
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219 |
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220 /** Get the amount of samples needed for input. |
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221 |
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222 This method returns the amount of samples needed for converter input |
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223 given the number of output samples. This method must be called before |
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224 each call to the processing methods. It is a serious error to have |
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225 \a outSamples greater than the value set with ScratchMemoryNeedOutputDriven(). |
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226 |
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227 @param[in] outSamples Amount of samples the converter produces |
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228 @return number of input samples needed |
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229 */ |
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230 |
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231 virtual int InSamplesNeeded(int outSamples); |
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232 |
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233 /** Get the maximum number of output samples for a given input sample count |
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234 |
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235 This method returns the maximum number of output samples the converter |
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236 can ever produce from a given number of input samples. The method assumes |
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237 that the converter be used either input-driven or output-driven; the |
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238 two modes should not be mixed. |
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239 |
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240 @param[in] inSamples Number of input samples |
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241 @return Maximum number of output samples |
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242 */ |
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243 |
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244 virtual int MaxOutputSampleCount(int inSamples) const; |
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245 |
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246 /** Run the sampling rate conversion for a block of samples |
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247 |
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248 This method runs the actual sampling rate conversion. The pointer arrays |
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249 have to contain valid pointers for numChannels channel data buffers. The |
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250 output buffers must have space for MaxOutputSampleCount(inSamples) audio |
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251 samples. |
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252 |
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253 @param[out] outputBuffers Pointer to output buffer array |
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254 @param[in] inputBuffers Pointer to input buffer array |
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255 @param[in] inSamples The number of input samples to process |
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256 @return Number of output samples |
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257 */ |
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258 |
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259 virtual int ProcessFromInput(int16 *outputBuffers[], |
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260 int16 *inputBuffers[], |
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261 int inSamples); |
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262 |
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263 /** Run the sampling rate conversion for a block of samples |
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264 |
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265 This method does the sampling rate conversion. The pointer arrays |
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266 have to contain valid pointers for numChannels channel data buffers. |
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267 The input buffers MUST contain the amount of samples returned by |
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268 a previous call to InSamplesNeeded. Output buffers must have space |
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269 for \a outSamples audio samples. |
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270 |
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271 @param[out] outputBuffers Pointer to output buffer array |
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272 @param[in] inputBuffers Pointer to input buffer array |
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273 @param[in] outSamples The number of samples the converter produces |
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274 @return Number of output samples |
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275 */ |
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276 |
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277 virtual int ProcessToOutput(int16 *outputBuffers[], |
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278 int16 *inputBuffers[], |
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279 int outSamples); |
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280 |
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281 //@} |
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282 |
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283 private: |
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284 |
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285 /** Constructor |
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286 */ |
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287 |
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288 RESAMPLER_SincConv44To48Int16(int channelCount); |
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289 |
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290 /** Disabled copy contructor |
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291 */ |
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292 RESAMPLER_SincConv44To48Int16(const RESAMPLER_SincConv44To48Int16 &); |
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293 |
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294 /** Initializes the converter. |
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295 |
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296 This method initializes the sampling rate converter. The |
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297 initialization will be successful only if 3*inRate == outRate. |
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298 |
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299 @return true if successful false otherwise |
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300 */ |
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301 |
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302 bool Init(); |
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303 |
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304 /** Deallocate all the allocated memory |
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305 |
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306 This methods deallocates all memory previously allocated by |
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307 InitOutputDriven(). Can be used both for recovering from a memory |
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308 allocation error and in destructor. |
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309 */ |
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310 void DeInit(); |
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311 |
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312 int16 **m_memBuffers; |
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313 int16 *m_scratchBuffer; |
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314 int m_channelCount; |
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315 int m_blockSize; |
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316 bool *m_channelEnabled; |
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317 |
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318 int m_inputSamples; |
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319 |
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320 int m_index1; |
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321 int m_index2; |
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322 |
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323 int m_zeroCrossings; |
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324 const int16 *m_filterMatrix; |
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325 }; |
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326 |
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327 #endif // __RESAMPLER_SINC_CONV_44_TO_48_INT16_H__ |