1 | |
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2 | |
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3 | |
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4 | |
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5 | |
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6 | |
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7 | |
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8 | |
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9 | #import "AudioGenerator.h" |
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10 | |
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11 | |
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12 | |
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13 | #define SAMPLE_RATE_F 48000.f |
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14 | #define SIGNAL_WAVE_FREQUENCY 100.f |
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15 | |
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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 | |
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23 | |
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24 | |
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25 | |
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26 | |
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27 | |
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28 | #define longHIGH 0.00089583333 |
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29 | #define longLOW 0.00070833333 |
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30 | #define shortHIGH 0.00045833333 |
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31 | #define shortLOW 0.0003125 |
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32 | |
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33 | #define USEFUL_BIT_SIZE 29 |
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34 | |
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35 | #define IDLE_TIME_MS 84 |
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36 | |
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37 | |
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38 | volatile BOOL g_refreshCtrCode = NO; |
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39 | |
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40 | |
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41 | |
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42 | |
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43 | |
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44 | |
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45 | |
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46 | |
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47 | |
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48 | |
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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 | |
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54 | |
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55 | #define INIT_CODE_DATA_SIZE 202 |
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56 | |
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57 | |
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58 | double g_initCodeTime[INIT_CODE_DATA_SIZE] = { |
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59 | |
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60 | 0.00089583333, 0.0003125, |
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61 | 0.00089583333, 0.0003125, |
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62 | 0.00089583333, 0.00070833333, |
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63 | 0.00045833333, 0.0003125, |
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64 | 0.00089583333, 0.00070833333, |
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65 | 0.00089583333, 0.00070833333, |
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66 | 0.00045833333, 0.0003125, |
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67 | 0.00089583333, 0.00070833333, |
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68 | 0.00089583333, 0.00070833333, |
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69 | 0.00089583333, 0.00070833333, |
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70 | 0.00045833333, 0.0003125, |
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71 | 0.00089583333, 0.00070833333, |
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72 | 0.00045833333, 0.0003125, |
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73 | 0.00045833333, 0.0003125, |
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74 | 0.00089583333, 0.00070833333, |
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75 | 0.00089583333, 0.00070833333, |
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76 | 0.00045833333, 0.0003125, |
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77 | 0.00045833333, 0.0003125, |
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78 | 0.00089583333, 0.00070833333, |
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79 | 0.00045833333, 0.0003125, |
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80 | 0.00045833333, 0.0003125, |
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81 | 0.00089583333, 0.00070833333, |
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82 | 0.00089583333, 0.00070833333, |
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83 | 0.00089583333, 0.00070833333, |
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84 | 0.00089583333, 0.00070833333, |
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85 | 0.00089583333, 0.00070833333, |
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86 | 0.00045833333, 0.0003125, |
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87 | 0.00089583333, 0.00070833333, |
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88 | 0.00089583333, 0.00070833333, |
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89 | 0.00045833333, 0.0003125, |
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90 | 0.00089583333, 0.00070833333, |
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91 | |
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92 | 0.083291667, |
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93 | |
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94 | 0.00089583333, 0.0003125, |
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95 | 0.00089583333, 0.0003125, |
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96 | 0.00089583333, 0.00070833333, |
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97 | 0.00045833333, 0.0003125, |
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98 | 0.00089583333, 0.00070833333, |
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99 | 0.00089583333, 0.00070833333, |
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100 | 0.00045833333, 0.0003125, |
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101 | 0.00089583333, 0.00070833333, |
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102 | 0.00089583333, 0.00070833333, |
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103 | 0.00089583333, 0.00070833333, |
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104 | 0.00045833333, 0.0003125, |
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105 | 0.00089583333, 0.00070833333, |
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106 | 0.00045833333, 0.0003125, |
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107 | 0.00045833333, 0.0003125, |
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108 | 0.00089583333, 0.00070833333, |
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109 | 0.00089583333, 0.00070833333, |
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110 | 0.00045833333, 0.0003125, |
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111 | 0.00045833333, 0.0003125, |
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112 | 0.00089583333, 0.00070833333, |
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113 | 0.00045833333, 0.0003125, |
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114 | 0.00045833333, 0.0003125, |
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115 | 0.00089583333, 0.00070833333, |
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116 | 0.00089583333, 0.00070833333, |
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117 | 0.00089583333, 0.00070833333, |
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118 | 0.00089583333, 0.00070833333, |
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119 | 0.00089583333, 0.00070833333, |
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120 | 0.00045833333, 0.0003125, |
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121 | 0.00089583333, 0.00070833333, |
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122 | 0.00089583333, 0.00070833333, |
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123 | 0.00045833333, 0.0003125, |
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124 | 0.00089583333, 0.00070833333, |
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125 | |
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126 | 0.083291667, |
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127 | |
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128 | 0.00029166667, 0.0027291667, |
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129 | 0.00029166667, 0.0027291667, |
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130 | 0.00029166667, 0.00033333333, |
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131 | 0.00025, 0.0000625, |
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132 | 0.00025, 0.0000625, |
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133 | 0.00025, 0.0000625, |
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134 | 0.00025, 0.0000625, |
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135 | 0.00025, 0.0000625, |
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136 | 0.00025, 0.0000625, |
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137 | |
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138 | 0.084354167, |
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139 | |
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140 | 0.00029166667, 0.0027291667, |
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141 | 0.00029166667, 0.0027291667, |
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142 | 0.00029166667, 0.00033333333, |
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143 | 0.00025, 0.0000625, |
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144 | 0.00025, 0.0000625, |
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145 | 0.00025, 0.0000625, |
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146 | 0.00025, 0.0000625, |
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147 | 0.00025, 0.0000625, |
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148 | 0.00025, 0.0000625, |
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149 | |
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150 | 0.084354167, |
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151 | |
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152 | 0.00029166667, 0.0027291667, |
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153 | 0.00029166667, 0.0027291667, |
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154 | 0.00025, 0.000375, |
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155 | 0.00025, 0.000375, |
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156 | 0.00025, 0.0000625, |
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157 | 0.00025, 0.0000625, |
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158 | 0.00025, 0.0000625, |
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159 | 0.00025, 0.0000625, |
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160 | 0.00025, 0.0000625, |
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161 | |
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162 | 0.084354167, |
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163 | |
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164 | 0.00029166667, 0.0027291667, |
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165 | 0.00029166667, 0.0027291667, |
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166 | 0.00025, 0.000375, |
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167 | 0.00025, 0.000375, |
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168 | 0.00025, 0.0000625, |
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169 | 0.00025, 0.0000625, |
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170 | 0.00025, 0.0000625, |
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171 | 0.00025, 0.0000625, |
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172 | 0.00025, 0.0000625, |
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173 | |
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174 | 0.084354167 |
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175 | |
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176 | }; |
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177 | |
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178 | |
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179 | BOOL g_initCodeUD[INIT_CODE_DATA_SIZE] = { |
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180 | |
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181 | YES, NO, |
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182 | YES, NO, |
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183 | YES, NO, |
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184 | YES, NO, |
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185 | YES, NO, |
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186 | YES, NO, |
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187 | YES, NO, |
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188 | YES, NO, |
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189 | YES, NO, |
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190 | YES, NO, |
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191 | YES, NO, |
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192 | YES, NO, |
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193 | YES, NO, |
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194 | YES, NO, |
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195 | YES, NO, |
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196 | YES, NO, |
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197 | YES, NO, |
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198 | YES, NO, |
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199 | YES, NO, |
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200 | YES, NO, |
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201 | YES, NO, |
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202 | YES, NO, |
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203 | YES, NO, |
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204 | YES, NO, |
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205 | YES, NO, |
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206 | YES, NO, |
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207 | YES, NO, |
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208 | YES, NO, |
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209 | YES, NO, |
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210 | YES, NO, |
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211 | YES, NO, |
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212 | |
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213 | NO, |
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214 | |
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215 | YES, NO, |
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216 | YES, NO, |
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217 | YES, NO, |
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218 | YES, NO, |
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219 | YES, NO, |
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220 | YES, NO, |
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221 | YES, NO, |
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222 | YES, NO, |
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223 | YES, NO, |
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224 | YES, NO, |
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225 | YES, NO, |
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226 | YES, NO, |
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227 | YES, NO, |
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228 | YES, NO, |
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229 | YES, NO, |
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230 | YES, NO, |
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231 | YES, NO, |
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232 | YES, NO, |
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233 | YES, NO, |
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234 | YES, NO, |
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235 | YES, NO, |
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236 | YES, NO, |
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237 | YES, NO, |
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238 | YES, NO, |
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239 | YES, NO, |
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240 | YES, NO, |
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241 | YES, NO, |
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242 | YES, NO, |
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243 | YES, NO, |
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244 | YES, NO, |
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245 | YES, NO, |
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246 | |
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247 | NO, |
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248 | |
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249 | YES, NO, |
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250 | YES, NO, |
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251 | YES, NO, |
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252 | YES, NO, |
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253 | YES, NO, |
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254 | YES, NO, |
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255 | YES, NO, |
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256 | YES, NO, |
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257 | YES, NO, |
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258 | |
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259 | NO, |
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260 | |
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261 | YES, NO, |
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262 | YES, NO, |
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263 | YES, NO, |
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264 | YES, NO, |
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265 | YES, NO, |
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266 | YES, NO, |
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267 | YES, NO, |
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268 | YES, NO, |
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269 | YES, NO, |
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270 | |
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271 | NO, |
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272 | |
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273 | YES, NO, |
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274 | YES, NO, |
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275 | YES, NO, |
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276 | YES, NO, |
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277 | YES, NO, |
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278 | YES, NO, |
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279 | YES, NO, |
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280 | YES, NO, |
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281 | YES, NO, |
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282 | |
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283 | NO, |
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284 | |
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285 | YES, NO, |
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286 | YES, NO, |
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287 | YES, NO, |
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288 | YES, NO, |
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289 | YES, NO, |
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290 | YES, NO, |
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291 | YES, NO, |
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292 | YES, NO, |
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293 | YES, NO, |
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294 | |
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295 | NO, |
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296 | |
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297 | }; |
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298 | |
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299 | |
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300 | @interface AudioGenerator() |
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301 | { |
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302 | |
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303 | int m_initCodeLen[INIT_CODE_DATA_SIZE]; |
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304 | |
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305 | AudioUnit m_audioUnit; |
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306 | Float32 m_sampleRate; |
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307 | BOOL m_isPlaying; |
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308 | double m_signalPhaseCur; |
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309 | |
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310 | |
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311 | int waveBit_01_len[2]; |
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312 | Float32 *waveBit_01[2]; |
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313 | |
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314 | int ctrWaveMaxLen; |
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315 | int ctrWaveDataLen; |
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316 | Float32 *ctrWave; |
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317 | |
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318 | int ctrWaveHeadLen; |
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319 | Float32 *ctrWaveHead; |
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320 | |
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321 | int ctrWaveReadIdx; |
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322 | |
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323 | int idleWaveLen; |
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324 | int idleWaveReadIdx; |
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325 | |
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326 | |
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327 | |
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328 | BOOL sendInitWave; |
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329 | |
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330 | int initWaveSendLenIdx; |
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331 | int initWaveSendLenIdxLenMax; |
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332 | int initWaveSendLenIdxLenCur; |
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333 | |
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334 | Float32 initWaveCurAngle; |
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335 | } |
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336 | |
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337 | @end |
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338 | |
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339 | |
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340 | @implementation AudioGenerator { |
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341 | |
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342 | float sampleTime; |
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343 | int longHighLength, shortHighLength, longZeroLength, longLowLength, mediumLowLength, shortLowLength, waveBitLength; |
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344 | float *waveLongHigh, *waveShortHigh, *waveLongZero, *waveLongLow, *waveMediumLow, *waveShortLow, *waveBit; |
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345 | |
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346 | |
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347 | |
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348 | int MAX_BUFFER_SIZE; |
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349 | |
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350 | } |
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351 | |
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352 | @synthesize yaw, pitch, throttle; |
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353 | |
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354 | - (id) init |
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355 | { |
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356 | self = [super init]; |
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357 | if (self) { |
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358 | sampleTime = 1.0f / SAMPLE_RATE_F; |
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359 | |
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360 | [self prepareStaticArrays]; |
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361 | } |
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362 | return self; |
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363 | } |
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364 | |
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365 | #pragma mark - ---- interface ---- |
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366 | |
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367 | - (void) playWithThrottle: (int)t yaw: (int)y pitch: (int)p |
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368 | { |
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369 | self.yaw = y; |
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370 | self.pitch = p; |
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371 | self.throttle = t; |
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372 | |
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373 | [self audioUnitStart]; |
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374 | |
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375 | } |
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376 | |
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377 | |
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378 | - (void) stop |
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379 | { |
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380 | [self audioUnitStop]; |
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381 | } |
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382 | |
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383 | |
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384 | #pragma mark - ---- Audio Unit func ---- |
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385 | |
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386 | - (void) audioUnitStart |
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387 | { |
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388 | |
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389 | if (m_audioUnit == nil) { |
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390 | [self prepareAudioUnit]; |
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391 | |
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392 | sendInitWave = YES; |
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393 | initWaveSendLenIdx = 0; |
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394 | initWaveSendLenIdxLenMax = m_initCodeLen[0]; |
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395 | initWaveSendLenIdxLenCur = 0; |
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396 | initWaveCurAngle = 0.f; |
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397 | } |
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398 | |
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399 | if (!m_isPlaying) { |
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400 | |
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401 | [self updateCtrCode:NO]; |
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402 | |
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403 | OSStatus status = AudioUnitInitialize(m_audioUnit); |
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404 | |
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405 | if (status != noErr) { |
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406 | NSLog(@"AudioUnitInitialize - error"); |
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407 | } |
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408 | |
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409 | |
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410 | status = AudioOutputUnitStart(m_audioUnit); |
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411 | if (status != noErr) { |
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412 | NSLog(@"AudioOutputUnitStart - error"); |
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413 | } |
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414 | |
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415 | m_isPlaying = YES; |
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416 | } |
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417 | else { |
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418 | [self updateCtrCode:YES]; |
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419 | } |
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420 | |
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421 | |
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422 | } |
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423 | |
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424 | |
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425 | - (void) audioUnitStop |
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426 | { |
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427 | |
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428 | if (m_isPlaying) { |
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429 | OSStatus status = AudioOutputUnitStop(m_audioUnit); |
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430 | if (status != noErr) { |
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431 | NSLog(@"AudioOutputUnitStop - error"); |
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432 | } |
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433 | |
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434 | m_isPlaying = NO; |
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435 | } |
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436 | |
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437 | if (m_audioUnit) { |
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438 | OSStatus status = AudioUnitUninitialize(m_audioUnit); |
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439 | if (status != noErr) { |
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440 | NSLog(@"AudioUnitUninitialize - error"); |
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441 | } |
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442 | |
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443 | status = AudioComponentInstanceDispose(m_audioUnit); |
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444 | if (status != noErr) { |
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445 | NSLog(@"AudioComponentInstanceDispose - error"); |
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446 | } |
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447 | |
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448 | m_audioUnit = nil; |
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449 | } |
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450 | |
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451 | |
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452 | } |
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453 | |
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454 | |
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455 | |
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456 | - (void) prepareAudioUnit |
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457 | { |
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458 | m_sampleRate = SAMPLE_RATE_F; |
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459 | m_isPlaying = NO; |
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460 | m_signalPhaseCur = 0.0; |
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461 | |
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462 | OSStatus status = noErr; |
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463 | |
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464 | AudioComponentDescription au_cd; |
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465 | au_cd.componentType = kAudioUnitType_Output; |
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466 | au_cd.componentSubType = kAudioUnitSubType_RemoteIO; |
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467 | au_cd.componentManufacturer = kAudioUnitManufacturer_Apple; |
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468 | au_cd.componentFlags = 0; |
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469 | au_cd.componentFlagsMask = 0; |
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470 | |
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471 | AudioComponent component = AudioComponentFindNext(NULL, &au_cd); |
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472 | if (component == NULL) { |
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473 | NSLog(@"AudioComponentFindNext - error"); |
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474 | } |
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475 | |
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476 | |
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477 | status = AudioComponentInstanceNew(component, &m_audioUnit); |
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478 | if (status != noErr) { |
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479 | NSLog(@"AudioComponentInstanceNew - error"); |
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480 | } |
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481 | |
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482 | |
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483 | AURenderCallbackStruct callbackStruct; |
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484 | callbackStruct.inputProc = renderAudioUnitCallback; |
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485 | callbackStruct.inputProcRefCon = (__bridge void *)(self); |
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486 | |
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487 | status = AudioUnitSetProperty(m_audioUnit, |
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488 | kAudioUnitProperty_SetRenderCallback, |
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489 | kAudioUnitScope_Input, |
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490 | 0, |
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491 | &callbackStruct, |
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492 | sizeof(AURenderCallbackStruct)); |
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493 | |
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494 | if (status != noErr) { |
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495 | NSLog(@"kAudioUnitProperty_SetRenderCallback - error"); |
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496 | } |
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497 | |
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498 | |
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499 | AudioStreamBasicDescription streamFormat; |
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500 | streamFormat.mSampleRate = m_sampleRate; |
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501 | streamFormat.mFormatID = kAudioFormatLinearPCM; |
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502 | streamFormat.mFormatFlags = kAudioFormatFlagsNativeFloatPacked | kAudioFormatFlagIsNonInterleaved; |
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503 | streamFormat.mChannelsPerFrame = 2; |
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504 | streamFormat.mBytesPerPacket = sizeof(Float32); |
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505 | streamFormat.mBytesPerFrame = sizeof(Float32); |
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506 | streamFormat.mFramesPerPacket = 1; |
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507 | streamFormat.mBitsPerChannel = 8 * sizeof(Float32); |
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508 | |
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509 | status = AudioUnitSetProperty(m_audioUnit, |
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510 | kAudioUnitProperty_StreamFormat, |
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511 | kAudioUnitScope_Input, |
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512 | 0, |
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513 | &streamFormat, |
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514 | sizeof(AudioStreamBasicDescription)); |
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515 | |
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516 | if (status != noErr) { |
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517 | NSLog(@"kAudioUnitProperty_StreamFormat - error"); |
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518 | } |
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519 | |
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520 | } |
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521 | |
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522 | |
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523 | OSStatus renderAudioUnitCallback(void* inRefCon, |
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524 | AudioUnitRenderActionFlags* ioActionFlags, |
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525 | const AudioTimeStamp* inTimeStamp, |
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526 | UInt32 inBusNumber, |
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527 | UInt32 inNumberFrames, |
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528 | AudioBufferList* ioData) |
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529 | { |
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530 | AudioGenerator *generator = (__bridge AudioGenerator*)inRefCon; |
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531 | |
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532 | Float32 *ctr_buffer = ioData->mBuffers[0].mData; |
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533 | [generator writeCtrWaveToBuffer:ctr_buffer maxSize:inNumberFrames]; |
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534 | |
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535 | Float32 *signal_buffer = ioData->mBuffers[1].mData; |
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536 | [generator writeSignalWaveToBuffer:signal_buffer maxSize:inNumberFrames]; |
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537 | |
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538 | return noErr; |
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539 | } |
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540 | |
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541 | |
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542 | - (void)writeCtrWaveToBuffer:(Float32*)buffer maxSize:(UInt32)frames |
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543 | { |
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544 | |
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545 | for (int i=0; i < frames; ++i) { |
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546 | |
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547 | if (g_refreshCtrCode) { |
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548 | ctrWaveReadIdx = 0; |
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549 | idleWaveReadIdx = 0; |
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550 | g_refreshCtrCode = NO; |
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551 | break; |
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552 | } |
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553 | |
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554 | if (sendInitWave) { |
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555 | |
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556 | double increment = M_PI/(g_initCodeTime[initWaveSendLenIdx] * SAMPLE_RATE_F); |
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557 | |
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558 | if (g_initCodeUD[initWaveSendLenIdx]) { |
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559 | *buffer++ = sinf(initWaveCurAngle); |
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560 | initWaveCurAngle += increment; |
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561 | } |
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562 | else { |
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563 | *buffer++ = 0.0f; |
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564 | } |
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565 | |
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566 | initWaveSendLenIdxLenCur++; |
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567 | |
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568 | if (initWaveSendLenIdxLenCur >= initWaveSendLenIdxLenMax) { |
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569 | initWaveSendLenIdx++; |
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570 | |
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571 | if (initWaveSendLenIdx >= INIT_CODE_DATA_SIZE) { |
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572 | sendInitWave = NO; |
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573 | continue; |
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574 | } |
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575 | else { |
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576 | initWaveSendLenIdxLenMax = m_initCodeLen[initWaveSendLenIdx]; |
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577 | initWaveSendLenIdxLenCur = 0; |
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578 | initWaveCurAngle = 0.f; |
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579 | } |
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580 | |
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581 | |
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582 | } |
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583 | |
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584 | |
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585 | } |
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586 | else { |
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587 | if (ctrWaveReadIdx < ctrWaveDataLen && idleWaveReadIdx == 0) { |
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588 | *buffer++ = ctrWave[ctrWaveReadIdx++]; |
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589 | } |
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590 | else if (ctrWaveReadIdx >= ctrWaveDataLen && idleWaveReadIdx < idleWaveLen) |
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591 | { |
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592 | *buffer++ = 0.0f; |
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593 | idleWaveReadIdx++; |
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594 | } |
---|
595 | else if (ctrWaveReadIdx >= ctrWaveDataLen && idleWaveReadIdx >= idleWaveLen) |
---|
596 | { |
---|
597 | ctrWaveReadIdx = 0; |
---|
598 | idleWaveReadIdx = 0; |
---|
599 | *buffer++ = ctrWave[ctrWaveReadIdx++]; |
---|
600 | } |
---|
601 | } |
---|
602 | |
---|
603 | |
---|
604 | } |
---|
605 | } |
---|
606 | |
---|
607 | - (void)writeSignalWaveToBuffer:(Float32*)buffer maxSize:(UInt32)frames |
---|
608 | { |
---|
609 | double phase_step = SIGNAL_WAVE_FREQUENCY * 2.0 * M_PI / SAMPLE_RATE_F; |
---|
610 | |
---|
611 | for (int i = 0; i < frames; ++i){ |
---|
612 | float wave = sin(m_signalPhaseCur); |
---|
613 | *buffer++ = wave; |
---|
614 | m_signalPhaseCur += phase_step; |
---|
615 | |
---|
616 | if (m_signalPhaseCur > 2.0 * M_PI) { |
---|
617 | m_signalPhaseCur -= 2.0 * M_PI; |
---|
618 | } |
---|
619 | } |
---|
620 | } |
---|
621 | |
---|
622 | |
---|
623 | |
---|
624 | #pragma mark - ---- Audio Generator func ---- |
---|
625 | |
---|
626 | |
---|
627 | |
---|
628 | - (void) prepareStaticArrays |
---|
629 | { |
---|
630 | |
---|
631 | waveLongHigh = [self generateHalfSine:true halfPeriod:longHIGH]; |
---|
632 | longHighLength = [self arraySizeWithHalfPeriod:longHIGH]; |
---|
633 | waveLongLow = [self generateHalfSine:false halfPeriod:longLOW]; |
---|
634 | longLowLength = [self arraySizeWithHalfPeriod:longLOW]; |
---|
635 | waveShortHigh = [self generateHalfSine:true halfPeriod:shortHIGH]; |
---|
636 | shortHighLength = [self arraySizeWithHalfPeriod:shortHIGH]; |
---|
637 | waveShortLow = [self generateHalfSine:false halfPeriod:shortLOW]; |
---|
638 | shortLowLength = [self arraySizeWithHalfPeriod:shortLOW]; |
---|
639 | |
---|
640 | float mediumLow = 0.0005 - sampleTime; |
---|
641 | waveMediumLow = [self generateHalfSine:false halfPeriod:mediumLow]; |
---|
642 | mediumLowLength = [self arraySizeWithHalfPeriod:mediumLow]; |
---|
643 | |
---|
644 | |
---|
645 | longZeroLength = (int)floor((0.002 + 1 / SAMPLE_RATE_F) * SAMPLE_RATE_F); |
---|
646 | waveLongZero = malloc(longZeroLength); |
---|
647 | |
---|
648 | [self generateWaveBit]; |
---|
649 | |
---|
650 | |
---|
651 | [self initCodeWaveLen]; |
---|
652 | |
---|
653 | [self generateCtrWaveHead]; |
---|
654 | [self generateWaveBit_01]; |
---|
655 | |
---|
656 | [self setupCtrWave]; |
---|
657 | } |
---|
658 | |
---|
659 | - (void)initCodeWaveLen |
---|
660 | { |
---|
661 | |
---|
662 | |
---|
663 | for (int i=0; i < INIT_CODE_DATA_SIZE; ++i) { |
---|
664 | m_initCodeLen[i] = [self arraySizeWithHalfPeriod:g_initCodeTime[i]]; |
---|
665 | } |
---|
666 | |
---|
667 | initWaveSendLenIdx = 0; |
---|
668 | initWaveSendLenIdxLenMax = m_initCodeLen[0]; |
---|
669 | initWaveSendLenIdxLenCur = 0; |
---|
670 | initWaveCurAngle = 0.f; |
---|
671 | } |
---|
672 | |
---|
673 | - (void)setupCtrWave |
---|
674 | { |
---|
675 | ctrWaveMaxLen = ctrWaveHeadLen + |
---|
676 | USEFUL_BIT_SIZE * (waveBit_01_len[0] > waveBit_01_len[1] ? waveBit_01_len[0] : waveBit_01_len[1]) + |
---|
677 | longHighLength; |
---|
678 | |
---|
679 | idleWaveLen = (int)floor(IDLE_TIME_MS * 0.001f * SAMPLE_RATE_F); |
---|
680 | |
---|
681 | ctrWave = malloc(sizeof(Float32) * ctrWaveMaxLen); |
---|
682 | |
---|
683 | memcpy(ctrWave, ctrWaveHead, sizeof(Float32) * ctrWaveHeadLen); |
---|
684 | |
---|
685 | ctrWaveReadIdx = 0; |
---|
686 | idleWaveReadIdx = 0; |
---|
687 | } |
---|
688 | |
---|
689 | |
---|
690 | |
---|
691 | - (void)generateCtrWaveHead |
---|
692 | { |
---|
693 | int ctr_longH_len = [self arraySizeWithHalfPeriod:longHIGH]; |
---|
694 | int ctr_shortL_len = [self arraySizeWithHalfPeriod:shortLOW]; |
---|
695 | |
---|
696 | ctrWaveHeadLen = 2 * ctr_longH_len + 2 * ctr_shortL_len; |
---|
697 | ctrWaveHead = malloc(sizeof(Float32) * ctrWaveHeadLen); |
---|
698 | |
---|
699 | int idx = 0; |
---|
700 | |
---|
701 | double increment = M_PI/((longHIGH - sampleTime * 2) * SAMPLE_RATE_F); |
---|
702 | double angle = 0; |
---|
703 | |
---|
704 | for (int i=0; i < ctr_longH_len; ++i) { |
---|
705 | Float32 value = sinf(angle); |
---|
706 | ctrWaveHead[idx + ctr_longH_len + ctr_shortL_len] = value; |
---|
707 | ctrWaveHead[idx++] = value; |
---|
708 | angle += increment; |
---|
709 | } |
---|
710 | |
---|
711 | memset(ctrWaveHead + idx, 0, sizeof(Float32) * ctr_shortL_len); |
---|
712 | memset(ctrWaveHead + (idx + ctr_longH_len + ctr_shortL_len), 0, sizeof(Float32) * ctr_shortL_len); |
---|
713 | |
---|
714 | } |
---|
715 | |
---|
716 | - (void) generateWaveBit_01 |
---|
717 | { |
---|
718 | waveBit_01_len[0] = shortHighLength + shortLowLength; |
---|
719 | waveBit_01_len[1] = longHighLength + longLowLength; |
---|
720 | |
---|
721 | waveBit_01[0] = malloc(sizeof(Float32) * waveBit_01_len[0]); |
---|
722 | waveBit_01[1] = malloc(sizeof(Float32) * waveBit_01_len[1]); |
---|
723 | |
---|
724 | int idx = 0; |
---|
725 | for (int i=0; i < shortHighLength; ++i) { |
---|
726 | waveBit_01[0][idx++] = waveShortHigh[i]; |
---|
727 | } |
---|
728 | for (int i=0; i < shortLowLength; ++i) { |
---|
729 | waveBit_01[0][idx++] = waveShortLow[i]; |
---|
730 | } |
---|
731 | |
---|
732 | idx = 0; |
---|
733 | for (int i=0; i < longHighLength; ++i) { |
---|
734 | waveBit_01[1][idx++] = waveLongHigh[i]; |
---|
735 | } |
---|
736 | for (int i=0; i < longLowLength; ++i) { |
---|
737 | waveBit_01[1][idx++] = waveLongLow[i]; |
---|
738 | } |
---|
739 | |
---|
740 | } |
---|
741 | |
---|
742 | - (void) generateWaveBit |
---|
743 | { |
---|
744 | waveBitLength = longHighLength + longLowLength + shortHighLength + shortLowLength; |
---|
745 | waveBit = malloc(sizeof(waveBit) * waveBitLength); |
---|
746 | int c = 0; |
---|
747 | for (int i = 0; i < longHighLength; i++) { |
---|
748 | waveBit[c++] = waveLongHigh[i]; |
---|
749 | } |
---|
750 | for (int i = 0; i < longLowLength; i++) { |
---|
751 | waveBit[c++] = waveLongLow[i]; |
---|
752 | } |
---|
753 | for (int i = 0; i < shortHighLength; i++) { |
---|
754 | waveBit[c++] = waveShortHigh[i]; |
---|
755 | } |
---|
756 | for (int i = 0; i < shortLowLength; i++) { |
---|
757 | waveBit[c++] = waveShortLow[i]; |
---|
758 | } |
---|
759 | } |
---|
760 | |
---|
761 | |
---|
762 | |
---|
763 | |
---|
764 | - (int) codeChecksum:(int)code |
---|
765 | { |
---|
766 | int checksum = 0; |
---|
767 | for (int i = 0; i < 7; i++) { |
---|
768 | checksum += (code >> 4*i) & 15; |
---|
769 | } |
---|
770 | return 16 - (checksum & 15); |
---|
771 | } |
---|
772 | |
---|
773 | |
---|
774 | |
---|
775 | |
---|
776 | |
---|
777 | |
---|
778 | |
---|
779 | - (int) generateCode |
---|
780 | { |
---|
781 | int channel = 1; |
---|
782 | int code = throttle << 21; |
---|
783 | code += 1 << 20; |
---|
784 | code += yaw << 12; |
---|
785 | code += pitch << 4; |
---|
786 | code += ((channel >> 1) & 1) << 19; |
---|
787 | code += (channel & 1) << 11; |
---|
788 | code += [self codeChecksum:code]; |
---|
789 | |
---|
790 | return (code << 1) + 1; |
---|
791 | } |
---|
792 | |
---|
793 | - (void)updateCtrCode:(BOOL)refresh |
---|
794 | { |
---|
795 | int ctr_code = [self generateCode]; |
---|
796 | |
---|
797 | |
---|
798 | |
---|
799 | |
---|
800 | |
---|
801 | |
---|
802 | [self codeToWave:ctr_code]; |
---|
803 | |
---|
804 | if (refresh) { |
---|
805 | g_refreshCtrCode = YES; |
---|
806 | } |
---|
807 | |
---|
808 | } |
---|
809 | |
---|
810 | - (void)codeToWave:(int)code |
---|
811 | { |
---|
812 | Float32 *pos = ctrWave + ctrWaveHeadLen; |
---|
813 | |
---|
814 | for (int i=USEFUL_BIT_SIZE-1; i >= 0 ; --i) { |
---|
815 | int bit = (code >> i) & 1; |
---|
816 | memcpy(pos, waveBit_01[bit], sizeof(Float32) * waveBit_01_len[bit]); |
---|
817 | pos += waveBit_01_len[bit]; |
---|
818 | } |
---|
819 | |
---|
820 | memcpy(pos, waveLongHigh, sizeof(Float32) * longHighLength); |
---|
821 | pos += longHighLength; |
---|
822 | |
---|
823 | ctrWaveDataLen = pos - ctrWave; |
---|
824 | int lost_len = ctrWaveMaxLen - ctrWaveDataLen; |
---|
825 | |
---|
826 | memset(pos, 0, sizeof(Float32) * lost_len); |
---|
827 | } |
---|
828 | |
---|
829 | |
---|
830 | |
---|
831 | |
---|
832 | - (int) writeBytesToBuffer:(Float32 *) buffer maxSize:(UInt32) frames |
---|
833 | { |
---|
834 | MAX_BUFFER_SIZE = sizeof(buffer) * frames; |
---|
835 | int position = 0; |
---|
836 | [self writeWaveToBuffer:buffer at:&position]; |
---|
837 | [self writeInitialWaveToBuffer:buffer at:&position]; |
---|
838 | |
---|
839 | return position; |
---|
840 | } |
---|
841 | |
---|
842 | - (void) writeInitialWaveToBuffer:(Float32 *) buffer at: (int *) position |
---|
843 | { |
---|
844 | [self writeWave123To: buffer at: position]; |
---|
845 | [self writeWave123To: buffer at: position]; |
---|
846 | [self writeWave456To: buffer at: position]; |
---|
847 | [self writeWave456To: buffer at: position]; |
---|
848 | [self writeWave456To: buffer at: position]; |
---|
849 | } |
---|
850 | |
---|
851 | - (void) writeWave123To:(Float32 *) buffer at:(int *) position |
---|
852 | { |
---|
853 | [self writeOriginalTo:buffer at: position]; |
---|
854 | [self writeArray:waveMediumLow to:buffer length:mediumLowLength at:position]; |
---|
855 | for (int i = 0; i < 4; i++) { |
---|
856 | [self writeShortHShortLTo:buffer at:position]; |
---|
857 | } |
---|
858 | [self writeArray:waveShortHigh to:buffer length:shortHighLength at:position]; |
---|
859 | [self writeMediumLShortHTo:buffer at:position]; |
---|
860 | [self writePauseInSamplesTo:buffer at:position]; |
---|
861 | } |
---|
862 | |
---|
863 | - (void) writeWave456To:(Float32 *) buffer at:(int *) position |
---|
864 | { |
---|
865 | [self writeOriginalTo:buffer at:position]; |
---|
866 | [self writeArray:waveShortLow to:buffer length:shortLowLength at:position]; |
---|
867 | for (int i = 0; i < 4; i++) { |
---|
868 | [self writeShortHShortLTo:buffer at:position]; |
---|
869 | } |
---|
870 | [self writeArray:waveShortHigh to:buffer length:shortHighLength at:position]; |
---|
871 | [self writeMediumLShortHTo:buffer at:position]; |
---|
872 | [self writePauseInSamplesTo:buffer at:position]; |
---|
873 | } |
---|
874 | |
---|
875 | |
---|
876 | - (void) writeOriginalTo:(Float32 *) buffer at:(int *) position |
---|
877 | { |
---|
878 | [self writeLongHLongZeroTo: buffer at: position]; |
---|
879 | [self writeLongHLongZeroTo: buffer at: position]; |
---|
880 | [self writeArray:waveLongHigh to:buffer length:longHighLength at:position]; |
---|
881 | [self writeMediumLShortHTo:buffer at:position]; |
---|
882 | } |
---|
883 | |
---|
884 | - (void) writeLongHLongZeroTo:(Float32 *) buffer at:(int *) position |
---|
885 | { |
---|
886 | [self writeArray:waveLongHigh to:buffer length:longHighLength at:position]; |
---|
887 | [self writeArray:waveLongZero to:buffer length:longZeroLength at:position]; |
---|
888 | } |
---|
889 | |
---|
890 | - (void) writeMediumLShortHTo:(Float32 *) buffer at:(int *) position |
---|
891 | { |
---|
892 | [self writeArray:waveMediumLow to:buffer length:mediumLowLength at:position]; |
---|
893 | [self writeArray:waveShortHigh to:buffer length:shortHighLength at:position]; |
---|
894 | } |
---|
895 | |
---|
896 | - (void) writeShortHShortLTo:(Float32 *) buffer at:(int *) position |
---|
897 | { |
---|
898 | [self writeArray:waveShortHigh to:buffer length:shortHighLength at:position]; |
---|
899 | [self writeArray:waveShortLow to:buffer length:shortLowLength at:position]; |
---|
900 | } |
---|
901 | |
---|
902 | - (void) writePauseInSamplesTo:(Float32 *) buffer at:(int *) position |
---|
903 | { |
---|
904 | int length = (int)floor(0.010 * SAMPLE_RATE_F); |
---|
905 | float arr[length]; |
---|
906 | [self writeArray:arr to:buffer length:length at:position]; |
---|
907 | } |
---|
908 | |
---|
909 | - (void) writeArray:(float *) array to:(Float32 *) buffer length: (int)length at:(int *) position |
---|
910 | { |
---|
911 | for (int i = 0; i < length; i++) { |
---|
912 | if (*position < MAX_BUFFER_SIZE) buffer[(*position)++] = array[i]; |
---|
913 | } |
---|
914 | } |
---|
915 | |
---|
916 | - (void) writeWaveToBuffer:(Float32 *) buffer at: (int *) position |
---|
917 | { |
---|
918 | [self halfSineGen: false halfPeriod: longLOW toBuffer:buffer at:position]; |
---|
919 | [self halfSineGen: true halfPeriod: longHIGH - sampleTime * 2 toBuffer:buffer at:position]; |
---|
920 | [self halfSineGen: false halfPeriod: shortLOW + sampleTime * 2 toBuffer:buffer at:position]; |
---|
921 | [self halfSineGen: true halfPeriod: longHIGH - sampleTime * 2 toBuffer:buffer at:position]; |
---|
922 | [self halfSineGen: false halfPeriod: shortLOW + sampleTime * 2 toBuffer:buffer at:position]; |
---|
923 | |
---|
924 | int code = [self generateCode]; |
---|
925 | for (int i=0; i < 27; i++) { |
---|
926 | buffer[(*position)++] = waveBit[((code >> (27 - i)) & 1)]; |
---|
927 | } |
---|
928 | for (int i = 0; i < longHighLength; i++) { |
---|
929 | buffer[(*position)++] = waveLongHigh[i]; |
---|
930 | } |
---|
931 | |
---|
932 | } |
---|
933 | |
---|
934 | |
---|
935 | |
---|
936 | |
---|
937 | |
---|
938 | |
---|
939 | |
---|
940 | |
---|
941 | |
---|
942 | - (void) halfSineGen:(BOOL)upper halfPeriod: (double)halfPeriod toBuffer:(Float32 *) buffer at:(int *) position |
---|
943 | { |
---|
944 | |
---|
945 | |
---|
946 | |
---|
947 | |
---|
948 | int sampleCount = [self arraySizeWithHalfPeriod:halfPeriod]; |
---|
949 | double increment = M_PI/(halfPeriod * SAMPLE_RATE_F); |
---|
950 | double angle = upper ? 0 : M_PI; |
---|
951 | |
---|
952 | for (int i = 0; i < sampleCount; i++) { |
---|
953 | buffer[(*position)++] = sinf(angle); |
---|
954 | angle += increment; |
---|
955 | } |
---|
956 | } |
---|
957 | |
---|
958 | - (int) arraySizeWithHalfPeriod: (double)halfPeriod |
---|
959 | { |
---|
960 | return (int)floor(halfPeriod * SAMPLE_RATE_F); |
---|
961 | } |
---|
962 | |
---|
963 | |
---|
964 | |
---|
965 | |
---|
966 | |
---|
967 | |
---|
968 | |
---|
969 | |
---|
970 | - (float *) generateHalfSine:(BOOL)upper halfPeriod: (double)halfPeriod |
---|
971 | { |
---|
972 | int sampleCount = [self arraySizeWithHalfPeriod:halfPeriod]; |
---|
973 | Float32 *array = malloc(sizeof(Float32) * sampleCount); |
---|
974 | double increment = M_PI/(halfPeriod * SAMPLE_RATE_F); |
---|
975 | double angle = 0; |
---|
976 | |
---|
977 | for (int i = 0; i < sampleCount; i++) { |
---|
978 | if (upper) { |
---|
979 | array[i] = sinf(angle); |
---|
980 | angle += increment; |
---|
981 | } |
---|
982 | else { |
---|
983 | array[i] = 0.0f; |
---|
984 | } |
---|
985 | |
---|
986 | } |
---|
987 | return array; |
---|
988 | } |
---|
989 | |
---|
990 | @end |
---|