1 | #include <stdio.h>
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2 | #include <malloc.h>
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3 | #include <math.h>
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4 | #include <sys/types.h>
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5 | #include <sys/stat.h>
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6 | #include <fcntl.h>
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7 | #include <linux/soundcard.h>
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8 |
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9 | #define SAMPLE_RATE 22050
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10 | #define FREQ_HZ 236 /* Don't change! */
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11 | #define FRAGMENTS ((2<<16) | 7)
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12 | #define SAMPLE_LENGTH (SAMPLE_RATE / FREQ_HZ)
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13 |
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14 | #define AUTHENTIC_SOUND
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15 | #define DECAY 0xf400 /* Depends on sample rate */
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16 | #define PCJR_DECAY 0xd000 /* Depends on sample rate */
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17 |
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18 | int sound_fd;
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19 |
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20 | int pc_jr = 0;
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21 |
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22 | typedef unsigned short uint16;
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23 | typedef short int16;
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24 | typedef unsigned char uint8;
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25 | typedef signed char int8;
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26 |
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27 | typedef struct _channel_info {
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28 | uint16 time_left;
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29 | uint16 next_cmd;
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30 | uint16 base_freq;
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31 | uint16 freq_delta;
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32 | uint16 freq;
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33 | uint16 volume;
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34 | uint16 volume_delta;
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35 | uint16 tempo;
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36 | uint16 inter_note_pause;
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37 | uint16 transpose;
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38 | uint16 note_length;
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39 | uint16 hull_curve;
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40 | uint16 hull_offset;
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41 | uint16 hull_counter;
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42 | uint16 freqmod_table;
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43 | uint16 freqmod_offset;
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44 | uint16 freqmod_incr;
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45 | uint16 freqmod_multiplier;
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46 | uint16 freqmod_modulo;
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47 | uint16 unknown[5];
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48 | uint16 music_script_nr;
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49 | } channel_info;
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50 |
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51 | void debug_channel(channel_info *channel) {
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52 | fprintf(stdout, "chn: %5d, %5d, %5d, %5d, %5d, %5d, %5d, %5d\n",
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53 | channel->time_left, channel->next_cmd,
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54 | channel->base_freq, channel->freq_delta,
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55 | channel->freq, channel->volume,
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56 | channel->volume_delta, channel->tempo);
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57 | fprintf(stdout, " %5d, %5d, %5d, %5d, %5d, %5d, %5d, %5d\n",
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58 | channel->inter_note_pause, channel->transpose,
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59 | channel->note_length, channel->hull_curve,
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60 | channel->hull_offset, channel->hull_counter,
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61 | channel->freqmod_table, channel->freqmod_offset);
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62 | fprintf(stdout, " %5d, %5d, %5d, %5d, %5d, %5d, %5d, %5d\n",
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63 | channel->freqmod_incr, channel->freqmod_multiplier,
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64 | channel->freqmod_modulo, channel->unknown[0],
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65 | channel->unknown[1], channel->unknown[2],
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66 | channel->unknown[3], channel->unknown[4]);
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67 | fprintf(stdout, " %5d\n",
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68 | channel->music_script_nr);
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69 | }
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70 |
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71 |
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72 | channel_info channels[8];
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73 | uint8 * retaddr;
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74 |
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75 | uint8 m_lfl[128];
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76 | uint16 m_off[128];
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77 | uint8 * music_script[128];
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78 |
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79 | uint8 note_lengths[] = {
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80 | 0,
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81 | 0, 0, 2,
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82 | 0, 3, 4,
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83 | 0, 6, 8,
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84 | 0, 12, 16,
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85 | 0, 24, 32,
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86 | 0, 48, 64
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87 | };
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88 |
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89 | uint16 hull_offsets[] = {
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90 | 0, 12, 24, 36, 48, 60,
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91 | 72, 88, 104, 120, 136, 240,
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92 | 152, 164
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93 | };
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94 |
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95 | int16 hulls[] = {
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96 | /* hull 0 */
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97 | 3, -1, 0, 0, 0, 0, 0, 0,
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98 | 0, -1, 0, 0,
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99 | /* hull 1 (staccato) */
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100 | 3, -1, 0, 30, 0, -1, 0, 0,
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101 | 0, -1, 0, 0,
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102 | /* hull 2 (legato) */
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103 | 3, -1, 0, 0, 0, 0, 0, 0,
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104 | 0, 0, 0, 0,
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105 | /* hull 3 (staccatissimo) */
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106 | 3, -1, 0, 2, 0, -1, 0, 0,
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107 | 0, -1, 0, 0,
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108 | /* hull 4 */
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109 | 3, -1, 0, 6, 0, -1, 0, 0,
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110 | 0, -1, 0, 0,
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111 | /* hull 5 */
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112 | 3, -1, 0, 10, 0, -1, 0, 0,
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113 | 0, -1, 0, 0,
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114 | /* hull 6 */
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115 | 60000, -1, -1000, 20, 0, 0, 0, 0,
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116 | 40000, -1, -5000, 5, 0, -1, 0, 0,
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117 | /* hull 7 */
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118 | 50000, -1, 0, 8, 30000, -1, 0, 0,
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119 | 28000, -1, -5000, 5, 0, -1, 0, 0,
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120 | /* hull 8 */
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121 | 60000, -1, -2000, 16, 0, 0, 0, 0,
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122 | 28000, -1, -6000, 5, 0, -1, 0, 0,
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123 | /* hull 9 */
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124 | 55000, -1, 0, 8, 35000, -1, 0, 0,
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125 | 40000, -1, -2000, 10, 0, -1, 0, 0,
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126 | /* hull 10 */
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127 | 60000, -1, 0, 4, -2000, 8, 0, 0,
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128 | 40000, -1, -6000, 5, 0, -1, 0, 0,
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129 | /* hull 12 */
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130 | 0, -1, 150, 340, -150, 340, 0, -1,
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131 | 0, -1, 0, 0,
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132 | /* hull 13 == 164*/
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133 | 20000, -1, 4000, 7, 1000, 15, 0, 0,
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134 | 35000, -1, -2000, 15, 0, -1, 0, 0,
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135 |
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136 | /* hull misc = 180 */
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137 | 44000, -1, -4400, 10, 0, -1, 0, 0,
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138 | 0, -1, 0, 0,
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139 |
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140 | 53000, -1, -5300, 10, 0, -1, 0, 0,
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141 | 0, -1, 0, 0,
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142 |
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143 | 63000, -1, -6300, 10, 0, -1, 0, 0,
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144 | 0, -1, 0, 0,
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145 |
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146 | 44000, -1, -1375, 32, 0, -1, 0, 0,
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147 | 0, -1, 0, 0,
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148 |
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149 | 53000, -1, -1656, 32, 0, -1, 0, 0,
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150 | 0, -1, 0, 0,
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151 |
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152 | /* hull 11 == 240 */
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153 | 63000, -1, -1968, 32, 0, -1, 0, 0,
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154 | 0, -1, 0, 0,
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155 |
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156 | 44000, -1, - 733, 60, 0, -1, 0, 0,
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157 | 0, -1, 0, 0,
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158 |
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159 | 53000, -1, - 883, 60, 0, -1, 0, 0,
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160 | 0, -1, 0, 0,
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161 |
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162 | 63000, -1, -1050, 60, 0, -1, 0, 0,
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163 | 0, -1, 0, 0,
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164 |
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165 | 44000, -1, - 488, 90, 0, -1, 0, 0,
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166 | 0, -1, 0, 0,
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167 |
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168 | 53000, -1, - 588, 90, 0, -1, 0, 0,
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169 | 0, -1, 0, 0,
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170 |
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171 | 63000, -1, - 700, 90, 0, -1, 0, 0,
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172 | 0, -1, 0, 0
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173 |
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174 | };
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175 |
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176 | uint16 freqmod_lengths[] = {
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177 | 0x1000, 0x1000, 0x20, 0x2000, 0x1000
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178 | };
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179 |
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180 | uint16 freqmod_offsets[] = {
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181 | 0, 0x100, 0x200, 0x302, 0x202
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182 | };
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183 |
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184 | uint8 freqmod_table[0x502] = {
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185 | /* freqmod 1 */
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186 | 0, 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48, 51,
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187 | 54, 57, 59, 62, 65, 67, 70, 73, 75, 78, 80, 82, 85, 87, 89, 91, 94,
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188 | 96, 98, 100, 102, 103, 105, 107, 108, 110, 112, 113, 114, 116, 117,
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189 | 118, 119, 120, 121, 122, 123, 123, 124, 125, 125, 126, 126, 126, 126,
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190 | 126, 126, 126, 126, 126, 126, 126, 125, 125, 124, 123, 123, 122, 121,
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191 | 120, 119, 118, 117, 116, 114, 113, 112, 110, 108, 107, 105, 103, 102,
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192 | 100, 98, 96, 94, 91, 89, 87, 85, 82, 80, 78, 75, 73, 70, 67, 65, 62,
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193 | 59, 57, 54, 51, 48, 45, 42, 39, 36, 33, 30, 27, 24, 21, 18, 15, 12,
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194 | 9, 6, 3, 0, 253, 250, 247, 244, 241, 238, 235, 232, 229, 226, 223, 220,
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195 | 217, 214, 211, 208, 205, 202, 199, 197, 194, 191, 189, 186, 183, 181,
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196 | 178, 176, 174, 171, 169, 167, 165, 162, 160, 158, 156, 154, 153, 151,
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197 | 149, 148, 146, 144, 143, 142, 140, 139, 138, 137, 136, 135, 134, 133,
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198 | 133, 132, 131, 131, 130, 130, 130, 130, 130, 130, 130, 130, 130, 130,
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199 | 130, 131, 131, 132, 133, 133, 134, 135, 136, 137, 138, 139, 140, 142,
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200 | 143, 144, 146, 148, 149, 151, 153, 154, 156, 158, 160, 162, 165, 167,
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201 | 169, 171, 174, 176, 178, 181, 183, 186, 189, 191, 194, 197, 199, 202,
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202 | 205, 208, 211, 214, 217, 220, 223, 226, 229, 232, 235, 238, 241, 244,
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203 | 247, 250, 253,
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204 |
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205 | /*freqmod 2*/
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206 | 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
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207 | 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36,
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208 | 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53,
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209 | 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70,
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210 | 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87,
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211 | 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103,
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212 | 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117,
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213 | 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131,
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214 | 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145,
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215 | 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
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216 | 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173,
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217 | 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187,
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218 | 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201,
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219 | 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215,
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220 | 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228, 229,
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221 | 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243,
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222 | 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255,
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223 |
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224 | /* freqmod 3 */
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225 | 136, 120,
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226 | /* freqmod 4 */
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227 | 136, 136, 136, 136, 136, 136, 136, 136,
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228 | 136, 136, 136, 136, 136, 136, 136, 136,
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229 | 136, 136, 136, 136, 136, 136, 136, 136,
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230 | 136, 136, 136, 136, 136, 136, 136, 136,
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231 | 136, 136, 136, 136, 136, 136, 136, 136,
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232 | 136, 136, 136, 136, 136, 136, 136, 136,
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233 | 136, 136, 136, 136, 136, 136, 136, 136,
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234 | 136, 136, 136, 136, 136, 136, 136, 136,
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235 | 136, 136, 136, 136, 136, 136, 136, 136,
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236 | 136, 136, 136, 136, 136, 136, 136, 136,
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237 | 136, 136, 136, 136, 136, 136, 136, 136,
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238 | 136, 136, 136, 136, 136, 136, 136, 136,
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239 | 136, 136, 136, 136, 136, 136, 136, 136,
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240 | 136, 136, 136, 136, 136, 136, 136, 136,
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241 | 136, 136, 136, 136, 136, 136, 136, 136,
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242 | 136, 136, 136, 136, 136, 136, 136, 136,
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243 |
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244 | 120, 120, 120, 120, 120, 120, 120, 120,
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245 | 120, 120, 120, 120, 120, 120, 120, 120,
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246 | 120, 120, 120, 120, 120, 120, 120, 120,
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247 | 120, 120, 120, 120, 120, 120, 120, 120,
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248 | 120, 120, 120, 120, 120, 120, 120, 120,
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249 | 120, 120, 120, 120, 120, 120, 120, 120,
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250 | 120, 120, 120, 120, 120, 120, 120, 120,
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251 | 120, 120, 120, 120, 120, 120, 120, 120,
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252 | 120, 120, 120, 120, 120, 120, 120, 120,
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253 | 120, 120, 120, 120, 120, 120, 120, 120,
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254 | 120, 120, 120, 120, 120, 120, 120, 120,
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255 | 120, 120, 120, 120, 120, 120, 120, 120,
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256 | 120, 120, 120, 120, 120, 120, 120, 120,
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257 | 120, 120, 120, 120, 120, 120, 120, 120,
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258 | 120, 120, 120, 120, 120, 120, 120, 120,
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259 | 120, 120, 120, 120, 120, 120, 120, 120,
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260 |
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261 | 41, 35, 190, 132, 225, 108, 214, 174,
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262 | 82, 144, 73, 241, 241, 187, 233, 235,
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263 | 179, 166, 219, 60, 135, 12, 62, 153,
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264 | 36, 94, 13, 28, 6, 183, 71, 222,
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265 | 179, 18, 77, 200, 67, 187, 139, 166,
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266 | 31, 3, 90, 125, 9, 56, 37, 31,
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267 | 93, 212, 203, 252, 150, 245, 69, 59,
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268 | 19, 13, 137, 10, 28, 219, 174, 50,
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269 | 32, 154, 80, 238, 64, 120, 54, 253,
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270 | 18, 73, 50, 246, 158, 125, 73, 220,
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271 | 173, 79, 20, 242, 68, 64, 102, 208,
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272 | 107, 196, 48, 183, 50, 59, 161, 34,
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273 | 246, 34, 145, 157, 225, 139, 31, 218,
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274 | 176, 202, 153, 2, 185, 114, 157, 73,
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275 | 44, 128, 126, 197, 153, 213, 233, 128,
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276 | 178, 234, 201, 204, 83, 191, 103, 214,
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277 | 191, 20, 214, 126, 45, 220, 142, 102,
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278 | 131, 239, 87, 73, 97, 255, 105, 143,
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279 | 97, 205, 209, 30, 157, 156, 22, 114,
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280 | 114, 230, 29, 240, 132, 79, 74, 119,
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281 | 2, 215, 232, 57, 44, 83, 203, 201,
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282 | 18, 30, 51, 116, 158, 12, 244, 213,
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283 | 212, 159, 212, 164, 89, 126, 53, 207,
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284 | 50, 34, 244, 204, 207, 211, 144, 45,
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285 | 72, 211, 143, 117, 230, 217, 29, 42,
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286 | 229, 192, 247, 43, 120, 129, 135, 68,
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287 | 14, 95, 80, 0, 212, 97, 141, 190,
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288 | 123, 5, 21, 7, 59, 51, 130, 31,
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289 | 24, 112, 146, 218, 100, 84, 206, 177,
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290 | 133, 62, 105, 21, 248, 70, 106, 4,
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291 | 150, 115, 14, 217, 22, 47, 103, 104,
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292 | 212, 247, 74, 74, 208, 87, 104, 118,
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293 | 250, 22, 187, 17, 173, 174, 36, 136,
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294 | 121, 254, 82, 219, 37, 67, 229, 60,
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295 | 244, 69, 211, 216, 40, 206, 11, 245,
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296 | 197, 96, 89, 61, 151, 39, 138, 89,
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297 | 118, 45, 208, 194, 201, 205, 104, 212,
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298 | 73, 106, 121, 37, 8, 97, 64, 20,
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299 | 177, 59, 106, 165, 17, 40, 193, 140,
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300 | 214, 169, 11, 135, 151, 140, 47, 241,
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301 | 21, 29, 154, 149, 193, 155, 225, 192,
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302 | 126, 233, 168, 154, 167, 134, 194, 181,
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303 | 84, 191, 154, 231, 217, 35, 209, 85,
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304 | 144, 56, 40, 209, 217, 108, 161, 102,
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305 | 94, 78, 225, 48, 156, 254, 217, 113,
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306 | 159, 226, 165, 226, 12, 155, 180, 71,
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307 | 101, 56, 42, 70, 137, 169, 130, 121,
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308 | 122, 118, 120, 194, 99, 177, 38, 223,
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309 | 218, 41, 109, 62, 98, 224, 150, 18,
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310 | 52, 191, 57, 166, 63, 137, 94, 241,
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311 | 109, 14, 227, 108, 40, 161, 30, 32,
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312 | 29, 203, 194, 3, 63, 65, 7, 132,
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313 | 15, 20, 5, 101, 27, 40, 97, 201,
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314 | 197, 231, 44, 142, 70, 54, 8, 220,
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315 | 243, 168, 141, 254, 190, 242, 235, 113,
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316 | 255, 160, 208, 59, 117, 6, 140, 126,
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317 | 135, 120, 115, 77, 208, 190, 130, 190,
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318 | 219, 194, 70, 65, 43, 140, 250, 48,
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319 | 127, 112, 240, 167, 84, 134, 50, 149,
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320 | 170, 91, 104, 19, 11, 230, 252, 245,
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321 | 202, 190, 125, 159, 137, 138, 65, 27,
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322 | 253, 184, 79, 104, 246, 114, 123, 20,
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323 | 153, 205, 211, 13, 240, 68, 58, 180,
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324 | 166, 102, 83, 51, 11, 203, 161, 16,
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325 | };
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326 |
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327 | uint16 *freqs_table;
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328 | uint16 spk_freq_table[12] = {
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329 | 36484, 34436, 32503, 30679, 29007, 27332,
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330 | 25798, 24350, 22983, 21693, 20476, 19326
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331 | };
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332 | uint16 pcjr_freq_table[12] = {
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333 | 65472, 61760, 58304, 55040, 52032, 49024,
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334 | 46272, 43648, 41216, 38912, 36736, 34624
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335 | };
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336 |
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337 | void execute_cmd(channel_info *channel) {
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338 | uint16 value;
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339 | int16 offset;
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340 | uint8 *script_ptr;
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341 | channel_info * current_channel;
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342 | channel_info * dest_channel;
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343 |
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344 | current_channel = channel;
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345 |
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346 | if (channel->next_cmd == 0)
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347 | return;
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348 | script_ptr = &music_script[channel->music_script_nr][channel->next_cmd];
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349 |
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350 | for (;;) {
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351 | uint8 opcode = *script_ptr++;
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352 | if (opcode >= 0xf8) {
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353 | switch (opcode) {
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354 | case 0xf8: /* set hull curve */
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355 | printf("channel[%d]: hull curve %2d\n",
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356 | channel - channels, *script_ptr);
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357 | channel->hull_curve = hull_offsets[*script_ptr/2];
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358 | script_ptr++;
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359 | break;
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360 |
|
---|
361 | case 0xf9: /* set freqmod curve */
|
---|
362 | printf("channel[%d]: freqmod curve %2d\n",
|
---|
363 | channel - channels, *script_ptr);
|
---|
364 | channel->freqmod_table = freqmod_offsets[*script_ptr/4];
|
---|
365 | channel->freqmod_modulo = freqmod_lengths[*script_ptr/4];
|
---|
366 | script_ptr++;
|
---|
367 | break;
|
---|
368 |
|
---|
369 | case 0xfd: /* clear other channel */
|
---|
370 | value = *(int16*)script_ptr;
|
---|
371 | printf("clear channel %d\n", value/50);
|
---|
372 | script_ptr += 2;
|
---|
373 | channel = &channels[value / sizeof(channel_info)];
|
---|
374 | /* fall through */
|
---|
375 | case 0xfa: /* clear current channel */
|
---|
376 | if (opcode == 0xfa)
|
---|
377 | printf("clear channel\n");
|
---|
378 | channel->next_cmd = 0;
|
---|
379 | channel->base_freq = 0;
|
---|
380 | channel->freq_delta = 0;
|
---|
381 | channel->freq = 0;
|
---|
382 | channel->volume = 0;
|
---|
383 | channel->volume_delta = 0;
|
---|
384 | channel->inter_note_pause = 0;
|
---|
385 | channel->transpose = 0;
|
---|
386 | channel->hull_curve = 0;
|
---|
387 | channel->hull_offset = 0;
|
---|
388 | channel->hull_counter = 0;
|
---|
389 | channel->freqmod_table = 0;
|
---|
390 | channel->freqmod_offset = 0;
|
---|
391 | channel->freqmod_incr = 0;
|
---|
392 | channel->freqmod_multiplier = 0;
|
---|
393 | channel->freqmod_modulo = 0;
|
---|
394 | break;
|
---|
395 |
|
---|
396 | case 0xfb: /* ret from subroutine */
|
---|
397 | printf("ret from sub\n");
|
---|
398 | script_ptr = retaddr;
|
---|
399 | break;
|
---|
400 | case 0xfc: /* call subroutine */
|
---|
401 | offset = *(int16*)script_ptr;
|
---|
402 | printf("subroutine %d\n", offset);
|
---|
403 | script_ptr += 2;
|
---|
404 | retaddr = script_ptr;
|
---|
405 | script_ptr = (void*)(int)offset;
|
---|
406 | printf("XXX1: %p -> %04x", script_ptr, offset);
|
---|
407 | break;
|
---|
408 | case 0xfe: /* loop music */
|
---|
409 | opcode = *script_ptr++;
|
---|
410 | offset = *(int16*)script_ptr;
|
---|
411 | script_ptr += 2;
|
---|
412 | printf("loop if %d to %d\n", opcode, offset);
|
---|
413 | if (! ((uint16*) channel)[opcode/2]
|
---|
414 | || --((uint16*) channel)[opcode/2])
|
---|
415 | script_ptr += offset;
|
---|
416 | break;
|
---|
417 |
|
---|
418 | case 0xff: /* set parameter */
|
---|
419 | opcode = *script_ptr++;
|
---|
420 | value = *(uint16*)script_ptr;
|
---|
421 | ((uint16*) channel)[opcode/2] = value;
|
---|
422 | printf("channel[%d]: set param %2d = %5d\n",
|
---|
423 | channel - &channels[0], opcode, value);
|
---|
424 | script_ptr+=2;
|
---|
425 | if (opcode == 0)
|
---|
426 | goto end;
|
---|
427 | break;
|
---|
428 | }
|
---|
429 | } else { /* opcode < 0xf8 */
|
---|
430 | for (;;) {
|
---|
431 | int16 note, octave;
|
---|
432 | dest_channel = &channels[opcode >> 5];
|
---|
433 | channel->time_left = channel->tempo * note_lengths[opcode & 0x1f];
|
---|
434 | fprintf(stdout, "channel[%d]: @%04x note: %3d+%d len: %2d hull: %d mod: %d/%d/%d %s\n",
|
---|
435 | opcode>>5, script_ptr ? script_ptr - music_script[channel->music_script_nr] : 0,
|
---|
436 | *script_ptr & 0x7f, (signed short) dest_channel->transpose, opcode & 0x1f,
|
---|
437 | dest_channel->hull_curve, dest_channel->freqmod_table,
|
---|
438 | dest_channel->freqmod_incr,dest_channel->freqmod_multiplier,
|
---|
439 | *script_ptr & 0x80 ? "last":"");
|
---|
440 | opcode = *script_ptr++;
|
---|
441 | note = opcode & 0x7f;
|
---|
442 | if (note != 0x7f) {
|
---|
443 | uint16 freq;
|
---|
444 | dest_channel->time_left = channel->time_left;
|
---|
445 | dest_channel->note_length =
|
---|
446 | channel->time_left - dest_channel->inter_note_pause;
|
---|
447 | note += dest_channel->transpose;
|
---|
448 | while (note < 0)
|
---|
449 | note += 12;
|
---|
450 | octave = note / 12;
|
---|
451 | note = note % 12;
|
---|
452 | dest_channel->hull_offset = 0;
|
---|
453 | dest_channel->hull_counter = 1;
|
---|
454 | if (pc_jr && dest_channel == &channels[3]) {
|
---|
455 | dest_channel->hull_curve = 180 + note * 12;
|
---|
456 | freq = 384 - 64 * octave;
|
---|
457 | } else {
|
---|
458 | freq = freqs_table[note] >> octave;
|
---|
459 | }
|
---|
460 | dest_channel->freq = dest_channel->base_freq = freq;
|
---|
461 | }
|
---|
462 | if ((opcode & 0x80) != 0)
|
---|
463 | goto end;
|
---|
464 | opcode = *script_ptr++;
|
---|
465 | }
|
---|
466 | }
|
---|
467 | }
|
---|
468 | end:
|
---|
469 | channel = current_channel;
|
---|
470 | if (channel->time_left)
|
---|
471 | goto finish;
|
---|
472 | #if 0
|
---|
473 | script_ptr = 0;
|
---|
474 | if (--fc8_c)
|
---|
475 | goto finish;
|
---|
476 |
|
---|
477 | channel->next_cmd = 0;
|
---|
478 | sound_status[fc8_4]--;
|
---|
479 | fc8_4 = 0;
|
---|
480 | look_for_pending_sound();
|
---|
481 | #endif
|
---|
482 | return;
|
---|
483 |
|
---|
484 | finish:
|
---|
485 | channel->next_cmd = script_ptr -
|
---|
486 | music_script[channel->music_script_nr];
|
---|
487 | return;
|
---|
488 | }
|
---|
489 |
|
---|
490 |
|
---|
491 |
|
---|
492 | void next_freqs(channel_info *channel) {
|
---|
493 | channel->volume += channel->volume_delta;
|
---|
494 | channel->base_freq += channel->freq_delta;
|
---|
495 |
|
---|
496 | channel->freqmod_offset += channel->freqmod_incr;
|
---|
497 | if (channel->freqmod_offset > channel->freqmod_modulo)
|
---|
498 | channel->freqmod_offset -= channel->freqmod_modulo;
|
---|
499 | channel->freq =
|
---|
500 | (int) (freqmod_table[channel->freqmod_table + (channel->freqmod_offset >> 4)])
|
---|
501 | * (int) channel->freqmod_multiplier / 256
|
---|
502 | + channel->base_freq;
|
---|
503 | #if 0
|
---|
504 | printf("Freq: %d/%d, %d/%d/%d*%d %d\n",
|
---|
505 | channel->base_freq, (int16)channel->freq_delta,
|
---|
506 | channel->freqmod_table, channel->freqmod_offset,
|
---|
507 | channel->freqmod_incr, channel->freqmod_multiplier,
|
---|
508 | channel->freq);
|
---|
509 | #endif
|
---|
510 |
|
---|
511 | if (channel->note_length && !--channel->note_length) {
|
---|
512 | channel->hull_offset += 16;
|
---|
513 | channel->hull_counter = 1;
|
---|
514 | }
|
---|
515 |
|
---|
516 | if (!--channel->time_left) {
|
---|
517 | execute_cmd(channel);
|
---|
518 | }
|
---|
519 | #if 0
|
---|
520 | fprintf(stdout, "channel[%d]: freq %d hull %d/%d/%d\n",
|
---|
521 | channel - &channels[0], channel->freq, channel->hull_curve, channel->hull_offset, channel->hull_counter);
|
---|
522 | #endif
|
---|
523 |
|
---|
524 | if (channel->hull_counter && !--channel->hull_counter) {
|
---|
525 | for (;;) {
|
---|
526 | int16 *hull_ptr = hulls
|
---|
527 | + channel->hull_curve + channel->hull_offset/2;
|
---|
528 | if (hull_ptr[1] == -1) {
|
---|
529 | channel->volume = hull_ptr[0];
|
---|
530 | if (hull_ptr[0] == 0)
|
---|
531 | channel->volume_delta = 0;
|
---|
532 | channel->hull_offset += 4;
|
---|
533 | } else {
|
---|
534 | channel->volume_delta = hull_ptr[0];
|
---|
535 | channel->hull_counter = hull_ptr[1];
|
---|
536 | channel->hull_offset += 4;
|
---|
537 | break;
|
---|
538 | }
|
---|
539 | }
|
---|
540 | }
|
---|
541 | }
|
---|
542 |
|
---|
543 | #ifdef AUTHENTIC_SOUND
|
---|
544 | /**
|
---|
545 | * This simulates the pc speaker sound, which is driven
|
---|
546 | * by the 8253 (square wave generator) and a low-band filter.
|
---|
547 | */
|
---|
548 | void produce_spk_sound() {
|
---|
549 | int8 sample[SAMPLE_LENGTH];
|
---|
550 | static int sample_offset = 0;
|
---|
551 | static int last_freq=100;
|
---|
552 | int winning_channel = -1;
|
---|
553 | int i, j;
|
---|
554 | int freq;
|
---|
555 | static uint level = 0;
|
---|
556 | for (j = 0; j < SAMPLE_LENGTH; j++) {
|
---|
557 | sample[j] = 0;
|
---|
558 | }
|
---|
559 | for (i = 0; i < 4; i++) {
|
---|
560 | if (!channels[i].time_left)
|
---|
561 | continue;
|
---|
562 | next_freqs(&channels[i]);
|
---|
563 | if (winning_channel == -1
|
---|
564 | && channels[i].volume
|
---|
565 | && channels[i].time_left) {
|
---|
566 | winning_channel = i;
|
---|
567 | }
|
---|
568 | }
|
---|
569 | if (winning_channel != -1) {
|
---|
570 | freq = channels[winning_channel].freq;
|
---|
571 | } else {
|
---|
572 | freq = 0;
|
---|
573 | }
|
---|
574 |
|
---|
575 | for (j = 0; j < SAMPLE_LENGTH; j++) {
|
---|
576 | level = (level * DECAY) >> 16;
|
---|
577 | if (sample_offset < freq*500)
|
---|
578 | level += 0xffff-DECAY;
|
---|
579 | sample[j] = (level >> 8);
|
---|
580 |
|
---|
581 | sample_offset += 1193000*1000 / SAMPLE_RATE;
|
---|
582 | if (sample_offset >= last_freq*1000) {
|
---|
583 | sample_offset -= last_freq*1000;
|
---|
584 | last_freq = freq;
|
---|
585 | }
|
---|
586 | }
|
---|
587 |
|
---|
588 | #if 0
|
---|
589 | fprintf(stdout, "channel[%d]: freq %d ; %d\n", winning_channel, freq, sample_offset);
|
---|
590 | #endif
|
---|
591 | fflush(stdout);
|
---|
592 | for (j = 0; j < SAMPLE_LENGTH;)
|
---|
593 | j += write(sound_fd, sample + j, SAMPLE_LENGTH - j);
|
---|
594 | }
|
---|
595 |
|
---|
596 | #else
|
---|
597 | void produce_spk_sound() {
|
---|
598 | int8 sample[SAMPLE_LENGTH];
|
---|
599 | static int sample_offset = 0;
|
---|
600 | int winning_channel = -1;
|
---|
601 | int i, j;
|
---|
602 | float freq, volume;
|
---|
603 | for (j = 0; j < SAMPLE_LENGTH; j++) {
|
---|
604 | sample[j] = 0;
|
---|
605 | }
|
---|
606 | for (i = 0; i < 4; i++) {
|
---|
607 | if (!channels[i].time_left)
|
---|
608 | continue;
|
---|
609 | next_freqs(&channels[i]);
|
---|
610 | if (winning_channel == -1
|
---|
611 | && channels[i].volume
|
---|
612 | && channels[i].time_left) {
|
---|
613 | winning_channel = i;
|
---|
614 | }
|
---|
615 | }
|
---|
616 | if (winning_channel != -1) {
|
---|
617 | i = winning_channel;
|
---|
618 | freq = channels[i].freq;
|
---|
619 | volume = channels[i].volume;
|
---|
620 | volume /= 3.0;
|
---|
621 | freq = 1193000 / freq;
|
---|
622 |
|
---|
623 |
|
---|
624 | for (j = 0; j < SAMPLE_LENGTH; j++) {
|
---|
625 | sample[j] += (int8)
|
---|
626 | (volume * 100
|
---|
627 | #ifdef SAEGEZAHN
|
---|
628 | * (sample_offset < SAMPLE_RATE/2
|
---|
629 | ? sample_offset - SAMPLE_RATE/4
|
---|
630 | : 3*SAMPLE_RATE/4 - sample_offset) /(SAMPLE_RATE/4)
|
---|
631 | #elif defined(RECHTECK)
|
---|
632 | * (sample_offset < SAMPLE_RATE/2 ? 1 : -1)
|
---|
633 | #else
|
---|
634 | * sin((double)sample_offset*2*3.145926 / SAMPLE_RATE)
|
---|
635 | #endif
|
---|
636 | );
|
---|
637 | sample_offset += freq;
|
---|
638 | sample_offset %= SAMPLE_RATE;
|
---|
639 | }
|
---|
640 |
|
---|
641 | #if 0
|
---|
642 | fprintf(stdout, "channel[%d]: freq %d = %0f ; volume %f %d\n", i, channels[i].freq, freq, volume, sample_offset);
|
---|
643 | #endif
|
---|
644 | }
|
---|
645 | fflush(stdout);
|
---|
646 | for (j = 0; j < SAMPLE_LENGTH;)
|
---|
647 | j += write(sound_fd, sample + j, SAMPLE_LENGTH - j);
|
---|
648 | }
|
---|
649 | #endif
|
---|
650 |
|
---|
651 | #define STEP 0x10000
|
---|
652 | #define UPDATESTEP ((STEP * SAMPLE_RATE) / (111860*2))
|
---|
653 | #define MAX_OUTPUT 0x7fff
|
---|
654 |
|
---|
655 | #define FB_WNOISE 0x12000 /* bit15.d(16bits) = bit0(out) ^ bit2 */
|
---|
656 | #define FB_PNOISE 0x08000 /* JH 981127 - fixes Do Run Run */
|
---|
657 | #define NG_PRESET 0x0f35
|
---|
658 |
|
---|
659 | int SN76496_count[4];
|
---|
660 | int SN76496_output[4];
|
---|
661 | int SN76496_voltable[16];
|
---|
662 |
|
---|
663 | void init_pcjr()
|
---|
664 | {
|
---|
665 | int i;
|
---|
666 | double out;
|
---|
667 | int gain;
|
---|
668 | /* increase max output basing on gain (0.2 dB per step) */
|
---|
669 | out = MAX_OUTPUT / 3;
|
---|
670 | gain = 10;
|
---|
671 | while (gain-- > 0)
|
---|
672 | out *= 1.023292992; /* = (10 ^ (0.2/20)) */
|
---|
673 | /* build volume table (2dB per step) */
|
---|
674 | for (i = 0; i < 15; i++) {
|
---|
675 | /* limit volume to avoid clipping */
|
---|
676 | if (out > MAX_OUTPUT / 3)
|
---|
677 | SN76496_voltable[i] = MAX_OUTPUT / 3;
|
---|
678 | else
|
---|
679 | SN76496_voltable[i] = out;
|
---|
680 | printf("%2d: %4x\n", i, SN76496_voltable[i]);
|
---|
681 | out /= 1.258925412; /* = 10 ^ (2/20) = 2dB */
|
---|
682 | }
|
---|
683 | SN76496_voltable[15] = 0;
|
---|
684 | }
|
---|
685 |
|
---|
686 | void produce_pcjr_sound() {
|
---|
687 | uint16 sample[SAMPLE_LENGTH];
|
---|
688 | int i, j;
|
---|
689 | uint16 freq, vol;
|
---|
690 | static int16 lastvol = 0;
|
---|
691 | memset(sample, 0, sizeof(sample));
|
---|
692 | for (i = 0; i < 4; i++) {
|
---|
693 | if (!channels[i].time_left)
|
---|
694 | continue;
|
---|
695 | next_freqs(&channels[i]);
|
---|
696 |
|
---|
697 | freq = channels[i].freq >> 6;
|
---|
698 | vol = (65535 - channels[i].volume) >> 12;
|
---|
699 | if (!channels[i].volume
|
---|
700 | && !channels[i].time_left) {
|
---|
701 | if (SN76496_count[i] >= SAMPLE_LENGTH * STEP)
|
---|
702 | SN76496_count[i] -= STEP * SAMPLE_LENGTH;
|
---|
703 | } else if (i < 3) {
|
---|
704 | int period = UPDATESTEP * freq;
|
---|
705 | if (period == 0)
|
---|
706 | period = UPDATESTEP;
|
---|
707 |
|
---|
708 | for (j = 0; j < SAMPLE_LENGTH; j++) {
|
---|
709 | unsigned int volume = 0;
|
---|
710 |
|
---|
711 | if (SN76496_output[i])
|
---|
712 | volume += SN76496_count[i];
|
---|
713 |
|
---|
714 | SN76496_count[i] -= STEP;
|
---|
715 | while (SN76496_count[i] <= 0) {
|
---|
716 | SN76496_count[i] += period;
|
---|
717 | if (SN76496_count[i] > 0) {
|
---|
718 | SN76496_output[i] ^= 1;
|
---|
719 | if (SN76496_output[i])
|
---|
720 | volume += period;
|
---|
721 | break;
|
---|
722 | }
|
---|
723 | SN76496_count[i] += period;
|
---|
724 | volume += period;
|
---|
725 | }
|
---|
726 |
|
---|
727 | if (SN76496_output[i])
|
---|
728 | volume -= SN76496_count[i];
|
---|
729 | volume *= SN76496_voltable[vol];
|
---|
730 | sample[j] += volume / STEP;
|
---|
731 | }
|
---|
732 | } else {
|
---|
733 | int left, period, RNG, NoiseFB;
|
---|
734 |
|
---|
735 | int n = (freq & 3);
|
---|
736 | if (n == 3) {
|
---|
737 | period = 2 * UPDATESTEP * (channels[2].freq>>6);
|
---|
738 | if (!period)
|
---|
739 | period = 2 * UPDATESTEP;
|
---|
740 | } else
|
---|
741 | period = UPDATESTEP << (5 + n);
|
---|
742 |
|
---|
743 | RNG = NG_PRESET;
|
---|
744 | NoiseFB = (freq & 4) ? FB_WNOISE : FB_PNOISE;
|
---|
745 | SN76496_output[3] = RNG & 1;
|
---|
746 |
|
---|
747 | for (j = 0; j < SAMPLE_LENGTH; j++) {
|
---|
748 | unsigned int volume = 0;
|
---|
749 |
|
---|
750 | if (SN76496_output[3])
|
---|
751 | volume += SN76496_count[3];
|
---|
752 | SN76496_count[3] -= STEP;
|
---|
753 | while (SN76496_count[3] <= 0) {
|
---|
754 | if (RNG & 1)
|
---|
755 | RNG ^= NoiseFB;
|
---|
756 | RNG >>= 1;
|
---|
757 | SN76496_output[3] = RNG & 1;
|
---|
758 | SN76496_count[3] += period;
|
---|
759 | if (SN76496_output[3])
|
---|
760 | volume += period;
|
---|
761 | }
|
---|
762 | if (SN76496_output[3])
|
---|
763 | volume -= SN76496_count[3];
|
---|
764 |
|
---|
765 | volume *= SN76496_voltable[vol];
|
---|
766 | sample[j] += volume / STEP;
|
---|
767 | }
|
---|
768 | }
|
---|
769 | #if 0
|
---|
770 | fprintf(stdout, "channel[%d]: freq %d %.1f ; volume %d \n", i, freq, 111860.0/freq, vol);
|
---|
771 | #endif
|
---|
772 | }
|
---|
773 | for (j = 0; j < SAMPLE_LENGTH; j++) {
|
---|
774 | lastvol = ((int)lastvol * PCJR_DECAY + (int)sample[j] * (0x10000-PCJR_DECAY)) >> 16;
|
---|
775 | sample[j] = lastvol;
|
---|
776 | }
|
---|
777 |
|
---|
778 | fflush(stdout);
|
---|
779 | for (j = 0; j < 2*SAMPLE_LENGTH;)
|
---|
780 | j += write(sound_fd, sample + j, 2*SAMPLE_LENGTH - j);
|
---|
781 | #if 0
|
---|
782 | for (j = 0; j < 2*SAMPLE_LENGTH;)
|
---|
783 | j += write(3, sample + j, 2*SAMPLE_LENGTH - j);
|
---|
784 | #endif
|
---|
785 | }
|
---|
786 |
|
---|
787 |
|
---|
788 | void init_channel(channel_info *channel) {
|
---|
789 | channel->next_cmd = 0;
|
---|
790 | channel->base_freq = 0;
|
---|
791 | channel->freq_delta = 0;
|
---|
792 | channel->freq = 0;
|
---|
793 | channel->volume = 0;
|
---|
794 | channel->volume_delta = 0;
|
---|
795 | channel->inter_note_pause = 0;
|
---|
796 | channel->transpose = 0;
|
---|
797 | channel->hull_curve = 0;
|
---|
798 | channel->hull_offset = 0;
|
---|
799 | channel->hull_counter = 0;
|
---|
800 | channel->freqmod_table = 0;
|
---|
801 | channel->freqmod_offset = 0;
|
---|
802 | channel->freqmod_incr = 0;
|
---|
803 | channel->freqmod_multiplier = 0;
|
---|
804 | channel->freqmod_modulo = 0;
|
---|
805 | channel->unknown[0] = 0;
|
---|
806 | channel->unknown[1] = 0;
|
---|
807 | channel->unknown[2] = 0;
|
---|
808 | channel->unknown[3] = 0;
|
---|
809 | channel->unknown[4] = 0;
|
---|
810 | channel->tempo = 0;
|
---|
811 | channel->note_length = 0;
|
---|
812 | }
|
---|
813 |
|
---|
814 |
|
---|
815 | void load_music(int nr) {
|
---|
816 | int i;
|
---|
817 | uint16 *music = (uint16*) music_script[nr];
|
---|
818 | int offset = pc_jr ? 7 : 3;
|
---|
819 | for (i = 0; i< 4; i++) {
|
---|
820 | init_channel(&channels[i]);
|
---|
821 | if (music[offset+i]) {
|
---|
822 | channels[i].music_script_nr = nr;
|
---|
823 | channels[i].next_cmd = music[offset+i];
|
---|
824 | channels[i].time_left = 1;
|
---|
825 | }
|
---|
826 | }
|
---|
827 |
|
---|
828 | while (channels[0].time_left
|
---|
829 | || channels[1].time_left
|
---|
830 | || channels[2].time_left
|
---|
831 | || channels[3].time_left) {
|
---|
832 | if (pc_jr)
|
---|
833 | produce_pcjr_sound();
|
---|
834 | else
|
---|
835 | produce_spk_sound();
|
---|
836 | }
|
---|
837 | }
|
---|
838 |
|
---|
839 | void read_level0() {
|
---|
840 | FILE * file;
|
---|
841 | uint8 b;
|
---|
842 | uint16 w;
|
---|
843 | int i;
|
---|
844 | file = fopen("00.lfl", "rb");
|
---|
845 |
|
---|
846 | fread(&w, 2, 1, file);
|
---|
847 | w ^= 0xffff;
|
---|
848 |
|
---|
849 | /* skip object */
|
---|
850 | fread(&w, 2, 1, file);
|
---|
851 | w ^= 0xffff;
|
---|
852 | fseek(file, w, SEEK_CUR);
|
---|
853 |
|
---|
854 | /* skip unknowns */
|
---|
855 | fread(&b, 1, 1, file);
|
---|
856 | b ^= 0xff;
|
---|
857 | fseek(file, 3*b, SEEK_CUR);
|
---|
858 |
|
---|
859 | /* skip costumes */
|
---|
860 | fread(&b, 1, 1, file);
|
---|
861 | b ^= 0xff;
|
---|
862 | fseek(file, 3*b, SEEK_CUR);
|
---|
863 |
|
---|
864 | /* skip scripts */
|
---|
865 | fread(&b, 1, 1, file);
|
---|
866 | b ^= 0xff;
|
---|
867 | fseek(file, 3*b, SEEK_CUR);
|
---|
868 |
|
---|
869 | /* read music */
|
---|
870 | fread(&b, 1, 1, file);
|
---|
871 | b ^= 0xff;
|
---|
872 | fread(&m_lfl, 1, b, file);
|
---|
873 | fread(&m_off, 2, b, file);
|
---|
874 | for (i = 0; i < b; i++) {
|
---|
875 | m_lfl[i] ^= 0xff;
|
---|
876 | m_off[i] ^= 0xffff;
|
---|
877 | }
|
---|
878 | fclose(file);
|
---|
879 | }
|
---|
880 |
|
---|
881 | void read_music(int nr) {
|
---|
882 | char lvl[20];
|
---|
883 | FILE * file;
|
---|
884 | int i;
|
---|
885 | uint16 len;
|
---|
886 | sprintf(lvl, "%02d.lfl", m_lfl[nr]);
|
---|
887 | printf("Opening %s\n", lvl);
|
---|
888 | file = fopen(lvl, "rb");
|
---|
889 | fseek(file, m_off[nr], SEEK_CUR);
|
---|
890 | fread(&len, 2, 1, file);
|
---|
891 | len ^= 0xffff;
|
---|
892 | music_script[nr] = malloc(len);
|
---|
893 | fseek(file, -2, SEEK_CUR);
|
---|
894 | fread(music_script[nr], 1, len, file);
|
---|
895 | for (i = 0; i < len; i++)
|
---|
896 | music_script[nr][i] ^= 0xff;
|
---|
897 | fclose(file);
|
---|
898 | }
|
---|
899 |
|
---|
900 | void open_sound() {
|
---|
901 | int param;
|
---|
902 | #ifndef WRITE_TO_RAW_FILE
|
---|
903 | sound_fd = open("/dev/dsp", O_WRONLY);
|
---|
904 |
|
---|
905 | param = FRAGMENTS;
|
---|
906 | ioctl(sound_fd, SNDCTL_DSP_SETFRAGMENT, ¶m);
|
---|
907 | printf ("Frags %d, ", param);
|
---|
908 | param = pc_jr ? AFMT_S16_LE : AFMT_U8;
|
---|
909 | ioctl(sound_fd, SNDCTL_DSP_SETFMT, ¶m);
|
---|
910 | printf ("Format %d, ", param);
|
---|
911 | param = 1;
|
---|
912 | ioctl(sound_fd, SNDCTL_DSP_CHANNELS, ¶m);
|
---|
913 | printf ("channels %d, ", param);
|
---|
914 |
|
---|
915 | param = SAMPLE_RATE;
|
---|
916 | ioctl(sound_fd, SNDCTL_DSP_SPEED, ¶m);
|
---|
917 | printf ("Sample rate: %d\n", param);
|
---|
918 | #else
|
---|
919 | sound_fd = open("intro.raw", O_CREAT|O_WRONLY, 0666);
|
---|
920 | #endif
|
---|
921 | }
|
---|
922 |
|
---|
923 | int main(int argc, char** argv) {
|
---|
924 | int nr, i;
|
---|
925 | if (argc > 2)
|
---|
926 | pc_jr = 1;
|
---|
927 | open_sound();
|
---|
928 | read_level0();
|
---|
929 | if (argc > 1)
|
---|
930 | nr = atoi(argv[1]);
|
---|
931 | else
|
---|
932 | nr = 95;
|
---|
933 | srand(1234);
|
---|
934 | /* freqmod_table[302-502] contains random values. This code replaces
|
---|
935 | this with different ones. Try it and say whether you hear the difference.
|
---|
936 | for (i = 0x302; i < 0x502; i++)
|
---|
937 | freqmod_table[i] = (rand()>> 8) & 0xff;
|
---|
938 | */
|
---|
939 | read_music(nr);
|
---|
940 | if (pc_jr)
|
---|
941 | init_pcjr();
|
---|
942 |
|
---|
943 | freqs_table = pc_jr ? pcjr_freq_table : spk_freq_table;
|
---|
944 |
|
---|
945 | load_music(nr);
|
---|
946 | return 0;
|
---|
947 | }
|
---|
948 |
|
---|