FreeCalypso > hg > freecalypso-tools
annotate ringtools/fc-e1decode.c @ 344:e0260c2982b6
fcup-atinterf: brown paper bag
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 04 Feb 2018 08:23:54 +0000 |
parents | c8806a5d4a6a |
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fc-e1decode utility written, compiles
Mychaela Falconia <falcon@freecalypso.org>
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1 /* |
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2 * This program decodes a binary Melody E1 file into the ASCII source format |
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3 * of our own invention which fc-e1gen accepts as input. |
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4 */ |
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5 |
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6 #include <sys/types.h> |
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7 #include <stdio.h> |
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8 #include <stdlib.h> |
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9 #include <ctype.h> |
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10 #include <string.h> |
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11 #include <strings.h> |
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12 |
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13 char *infname; |
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14 FILE *inf, *outf; |
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15 |
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16 static unsigned |
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17 get_word() |
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18 { |
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19 u_char b[2]; |
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20 int i, c; |
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21 |
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22 for (i = 0; i < 2; i++) { |
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23 c = getc(inf); |
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24 if (c < 0) { |
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25 fprintf(stderr, "error: premature EOF in %s\n", |
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26 infname); |
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27 exit(1); |
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28 } |
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29 b[i] = c; |
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30 } |
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31 return((b[1] << 8) | b[0]); |
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32 } |
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33 |
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34 do_global_osc_set() |
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35 { |
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36 unsigned word, osc; |
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37 |
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38 word = get_word(); |
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39 fprintf(outf, "osc-set (%u)", word & 0xFF); |
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40 for (osc = 0; osc < 8; osc++) |
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41 if (word & (1 << (osc + 8))) |
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42 fprintf(outf, " %u", osc); |
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43 putc('\n', outf); |
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44 putc('\n', outf); |
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45 } |
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46 |
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47 convert_signed_14bit(u) |
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48 unsigned u; |
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49 { |
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50 int i; |
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51 |
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52 i = u; |
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53 if (i >= 8192) |
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54 i -= 16384; |
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55 return (i); |
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56 } |
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57 |
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58 convert_signed_5bit(u) |
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59 unsigned u; |
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60 { |
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61 int i; |
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62 |
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63 i = u; |
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64 if (i >= 16) |
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65 i -= 32; |
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66 return (i); |
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67 } |
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68 |
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69 process_oscwords(osc, warnflags) |
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70 unsigned osc, *warnflags; |
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71 { |
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72 unsigned word0, word1, extraword; |
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73 |
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74 word0 = get_word(); |
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75 word1 = get_word(); |
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76 if (word1 & 0xF) |
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77 *warnflags |= 1; |
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78 fprintf(outf, "osc %u (%u)", osc, word0 & 1); |
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79 if (word0 & 2) { |
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80 fprintf(outf, " df %d %u", convert_signed_14bit(word0 >> 2), |
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81 word1 >> 6); |
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82 } else { |
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83 if (word0 & 4) |
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84 fputs(" sq1", outf); |
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85 if (word0 & 8) |
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86 fputs(" sq2", outf); |
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87 fprintf(outf, " %u %u %u", (word0 >> 4) & 0x3F, word0 >> 10, |
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88 word1 >> 6); |
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89 } |
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90 if (word1 & 0x10) { |
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91 extraword = get_word(); |
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92 if (extraword & 0xFF) |
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93 *warnflags |= 2; |
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94 fprintf(outf, " trem %u %d", (extraword >> 8) & 7, |
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95 convert_signed_5bit(extraword >> 11)); |
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96 } |
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97 if (word1 & 0x20) { |
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98 extraword = get_word(); |
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99 fprintf(outf, " env %u %u %u %u %u", extraword & 0xF, |
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100 extraword >> 13, (extraword >> 10) & 7, |
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101 (extraword >> 7) & 7, (extraword >> 4) & 7); |
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102 } |
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103 putc('\n', outf); |
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104 } |
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105 |
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106 process_block(timeword) |
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107 unsigned timeword; |
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108 { |
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109 unsigned osc, warnflags[8], anywarn; |
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110 |
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111 fprintf(outf, "time %u\n", timeword & 0xFF); |
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112 for (osc = 0; osc < 8; osc++) { |
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113 warnflags[osc] = 0; |
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114 if (timeword & (1 << (osc + 8))) |
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115 process_oscwords(osc, warnflags + osc); |
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116 } |
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117 putc('\n', outf); |
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118 anywarn = 0; |
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119 for (osc = 0; osc < 8; osc++) { |
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120 if (warnflags[osc] & 1) { |
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121 fprintf(outf, |
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122 "# warning: reserved bits set in osc %u word1 above\n", |
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123 osc); |
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124 anywarn = 1; |
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125 } |
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126 if (warnflags[osc] & 2) { |
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127 fprintf(outf, |
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128 "# warning: reserved bits set in osc %u word2 above\n", |
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129 osc); |
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130 anywarn = 1; |
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131 } |
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132 } |
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133 if (anywarn) |
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134 putc('\n', outf); |
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135 } |
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136 |
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137 main(argc, argv) |
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138 char **argv; |
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139 { |
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140 unsigned timeword; |
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141 |
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142 if (argc < 2 || argc > 3) { |
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143 fprintf(stderr, "usage: %s infile [outfile]\n", argv[0]); |
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144 exit(1); |
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145 } |
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146 infname = argv[1]; |
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147 inf = fopen(infname, "r"); |
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148 if (!inf) { |
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149 perror(infname); |
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150 exit(1); |
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151 } |
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152 if (argc > 2) { |
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153 outf = fopen(argv[2], "w"); |
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154 if (!outf) { |
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155 perror(argv[2]); |
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156 exit(1); |
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157 } |
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158 } else |
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159 outf = stdout; |
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160 do_global_osc_set(); |
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161 for (;;) { |
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162 timeword = get_word(); |
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163 if (timeword == 0) |
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164 break; |
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165 process_block(timeword); |
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166 } |
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167 fputs("end\n", outf); |
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168 exit(0); |
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169 } |