Mercurial > repos > blastem
annotate cue.c @ 2079:5a2b759f6b2d
BIOS doesn't like it if TOC read happens too quickly
author | Michael Pavone <pavone@retrodev.com> |
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date | Tue, 01 Feb 2022 01:14:27 -0800 |
parents | 3f29e2726522 |
children | bafb757e1cd2 |
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1 #include <ctype.h> |
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2 #include <string.h> |
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3 |
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4 #include "system.h" |
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5 #include "util.h" |
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6 |
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7 static char* cmd_start(char *cur) |
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8 { |
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9 while (*cur && isblank(*cur)) |
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10 { |
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11 cur++; |
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12 } |
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13 return cur; |
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14 } |
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15 |
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16 static char* next_line(char *cur) |
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17 { |
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18 while (*cur && *cur != '\n') |
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19 { |
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20 cur++; |
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21 } |
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22 if (*cur) { |
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23 return cur + 1; |
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24 } |
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25 return NULL; |
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26 } |
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27 |
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28 static uint32_t timecode_to_lba(char *timecode) |
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29 { |
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30 char *end; |
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31 int seconds = 0, frames = 0; |
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32 int minutes = strtol(timecode, &end, 10); |
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33 if (end) { |
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34 timecode = end + 1; |
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35 seconds = strtol(timecode, &end, 10); |
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36 if (end) { |
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37 timecode = end + 1; |
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38 frames = strtol(timecode, NULL, 10); |
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39 } |
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40 } |
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41 seconds += minutes * 60; |
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42 return seconds * 75 + frames; |
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43 |
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44 } |
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45 |
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46 static void bin_seek(system_media *media, uint32_t sector) |
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47 { |
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48 media->cur_sector = sector; |
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49 uint32_t lba = sector; |
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50 for (uint32_t i = 0; i < media->num_tracks; i++) |
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51 { |
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52 if (lba < media->tracks[i].fake_pregap) { |
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53 media->in_fake_pregap = 1; |
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54 break; |
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55 } |
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56 lba -= media->tracks[i].fake_pregap; |
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57 if (lba < media->tracks[i].start_lba) { |
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58 media->in_fake_pregap = 1; |
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59 break; |
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60 } |
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61 if (lba < media->tracks[i].end_lba) { |
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62 media->in_fake_pregap = 0; |
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63 break; |
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64 } |
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65 } |
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66 if (!media->in_fake_pregap) { |
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67 fseek(media->f, lba * 2352, SEEK_SET); |
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68 } |
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69 } |
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70 |
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71 static uint8_t fake_read(uint32_t sector, uint32_t offset) |
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72 { |
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73 if (!offset || (offset >= 16)) { |
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74 return 0; |
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75 //TODO: error detection and correction bytes |
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76 } else if (offset < 12) { |
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77 return 0xFF; |
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78 } else if (offset == 12) { |
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79 uint32_t minute = (sector / 75) / 60; |
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80 return (minute % 10) | ((minute / 10 ) << 4); |
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81 } else if (offset == 13) { |
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82 uint32_t seconds = (sector / 75) % 60; |
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83 return (seconds % 10) | ((seconds / 10 ) << 4); |
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84 } else if (offset == 14) { |
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85 uint32_t frames = sector % 75; |
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86 return (frames % 10) | ((frames / 10 ) << 4); |
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87 } else { |
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88 return 1; |
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89 } |
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90 } |
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91 |
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92 static uint8_t bin_read(system_media *media, uint32_t offset) |
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93 { |
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94 if (media->in_fake_pregap) { |
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95 return fake_read(media->cur_sector, offset); |
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96 } else { |
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97 return fgetc(media->f); |
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98 } |
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99 } |
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100 |
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101 static void iso_seek(system_media *media, uint32_t sector) |
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102 { |
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103 media->cur_sector = sector; |
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104 if (sector < (2 * 75)) { |
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105 media->in_fake_pregap = 1; |
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106 } else { |
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107 media->in_fake_pregap = 0; |
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108 fseek(media->f, (sector - 2 * 75) * 2048, SEEK_SET); |
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109 } |
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110 } |
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111 |
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112 static uint8_t iso_read(system_media *media, uint32_t offset) |
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113 { |
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114 if (media->in_fake_pregap || offset < 16 || offset > (2048 + 16)) { |
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115 return fake_read(media->cur_sector, offset); |
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116 } else { |
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117 return fgetc(media->f); |
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118 } |
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119 } |
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120 |
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121 uint8_t parse_cue(system_media *media) |
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122 { |
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123 char *line = media->buffer; |
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124 media->num_tracks = 0; |
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125 do { |
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126 char *cmd = cmd_start(line); |
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127 if (cmd) { |
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128 if (startswith(cmd, "TRACK ")) { |
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129 media->num_tracks++; |
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130 } |
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131 line = next_line(cmd); |
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132 } else { |
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133 line = NULL; |
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134 } |
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135 } while (line); |
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136 track_info *tracks = calloc(sizeof(track_info), media->num_tracks); |
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137 media->tracks = tracks; |
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138 line = media->buffer; |
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139 int track = -1; |
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140 do { |
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141 char *cmd = cmd_start(line); |
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142 if (cmd) { |
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143 if (startswith(cmd, "TRACK ")) { |
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144 track++; |
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145 cmd += 6; |
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146 char *end; |
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147 int file_track = strtol(cmd, &end, 10); |
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148 if (file_track != (track + 1)) { |
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149 warning("Expected track %d, but found track %d in CUE sheet\n", track + 1, file_track); |
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150 } |
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151 cmd = cmd_start(end); |
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152 if (cmd) { |
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153 tracks[track].type = startswith(cmd, "AUDIO") ? TRACK_AUDIO : TRACK_DATA; |
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154 } |
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155 } else if (startswith(cmd, "FILE ")) { |
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156 if (media->f) { |
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157 warning("CUE sheets with multiple FILE commands are not supported\n"); |
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158 } else { |
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159 cmd += 5; |
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160 cmd = strchr(cmd, '"'); |
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161 if (cmd) { |
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162 cmd++; |
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163 char *end = strchr(cmd, '"'); |
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164 if (end) { |
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165 char *fname; |
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166 //TODO: zipped BIN/CUE support |
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167 if (is_absolute_path(cmd)) { |
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168 fname = malloc(end-cmd + 1); |
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169 memcpy(fname, cmd, end-cmd); |
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170 fname[end-cmd] = 0; |
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171 } else { |
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172 size_t dirlen = strlen(media->dir); |
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173 fname = malloc(dirlen + 1 + (end-cmd) + 1); |
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174 memcpy(fname, media->dir, dirlen); |
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175 fname[dirlen] = PATH_SEP[0]; |
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176 memcpy(fname + dirlen + 1, cmd, end-cmd); |
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177 fname[dirlen + 1 + (end-cmd)] = 0; |
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178 } |
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179 media->f = fopen(fname, "rb"); |
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180 if (!media->f) { |
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181 fatal_error("Failed to open %s specified by FILE command in CUE sheet %s.%s\n", fname, media->name, media->extension); |
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182 } |
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183 free(fname); |
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184 } |
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185 } |
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186 } |
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187 } else if (track >= 0) { |
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188 if (startswith(cmd, "PREGAP ")) { |
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189 tracks[track].fake_pregap = timecode_to_lba(cmd + 7); |
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190 } else if (startswith(cmd, "INDEX ")) { |
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191 char *after; |
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192 int index = strtol(cmd + 6, &after, 10); |
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193 if (!index) { |
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194 tracks[track].pregap_lba = timecode_to_lba(after); |
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195 } else if (index == 1) { |
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196 tracks[track].start_lba = timecode_to_lba(after); |
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197 } |
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198 } |
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199 } |
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200 if (cmd) { |
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201 line = next_line(cmd); |
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202 } else { |
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203 line = NULL; |
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204 } |
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205 } else { |
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206 line = NULL; |
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207 } |
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208 } while (line); |
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209 for (uint32_t i = 0; i < (media->num_tracks - 1); i++) |
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210 { |
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211 uint32_t next = i + 1; |
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212 tracks[i].end_lba = tracks[next].pregap_lba ? tracks[next].pregap_lba : tracks[next].start_lba; |
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213 } |
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214 if (media->f) { |
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215 //end of last track is implicitly defined by file size |
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216 tracks[media->num_tracks-1].end_lba = file_size(media->f) / 2352; |
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217 //replace cue sheet with first sector |
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218 free(media->buffer); |
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219 media->buffer = calloc(2048, 1); |
2062
07ed42bd7b4c
Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
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2061
diff
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|
220 if (tracks[0].type = TRACK_DATA) { |
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2061
diff
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221 // if the first track is a data track, don't trust the CUE sheet and look at the MM:SS:FF from first sector |
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Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
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2061
diff
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|
222 uint8_t msf[3]; |
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Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
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2061
diff
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223 fseek(media->f, 12, SEEK_SET); |
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Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
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diff
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224 if (sizeof(msf) == fread(msf, 1, sizeof(msf), media->f)) { |
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diff
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225 tracks[0].fake_pregap = msf[2] + (msf[0] * 60 + msf[1]) * 75; |
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226 } |
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227 } |
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diff
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228 |
2059
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229 fseek(media->f, 16, SEEK_SET); |
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230 media->size = fread(media->buffer, 1, 2048, media->f); |
2076
3f29e2726522
Added basic support for ISO images for games that only have a data track
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2074
diff
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|
231 media->seek = bin_seek; |
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2074
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232 media->read = bin_read; |
2059
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233 } |
2061
7c1760b5b3e5
Implemented basic TOC functionality of CDD MCU
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2059
diff
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|
234 uint8_t valid = tracks > 0 && media->f != NULL; |
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Implemented basic TOC functionality of CDD MCU
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2059
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235 media->type = valid ? MEDIA_CDROM : MEDIA_CART; |
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2059
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236 return valid; |
2059
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237 } |
2076
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|
238 |
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diff
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|
239 uint32_t make_iso_media(system_media *media, const char *filename) |
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2074
diff
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240 { |
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2074
diff
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|
241 media->f = fopen(filename, "rb"); |
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2074
diff
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242 if (!media->f) { |
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Added basic support for ISO images for games that only have a data track
Michael Pavone <pavone@retrodev.com>
parents:
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243 return 0; |
3f29e2726522
Added basic support for ISO images for games that only have a data track
Michael Pavone <pavone@retrodev.com>
parents:
2074
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244 } |
3f29e2726522
Added basic support for ISO images for games that only have a data track
Michael Pavone <pavone@retrodev.com>
parents:
2074
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245 media->buffer = calloc(2048, 1); |
3f29e2726522
Added basic support for ISO images for games that only have a data track
Michael Pavone <pavone@retrodev.com>
parents:
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246 media->size = fread(media->buffer, 1, 2048, media->f); |
2079
5a2b759f6b2d
BIOS doesn't like it if TOC read happens too quickly
Michael Pavone <pavone@retrodev.com>
parents:
2076
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247 media->num_tracks = 1; |
5a2b759f6b2d
BIOS doesn't like it if TOC read happens too quickly
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parents:
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248 media->tracks = calloc(sizeof(track_info), 1); |
2076
3f29e2726522
Added basic support for ISO images for games that only have a data track
Michael Pavone <pavone@retrodev.com>
parents:
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249 media->tracks[0] = (track_info){ |
3f29e2726522
Added basic support for ISO images for games that only have a data track
Michael Pavone <pavone@retrodev.com>
parents:
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250 .fake_pregap = 2 * 75, |
3f29e2726522
Added basic support for ISO images for games that only have a data track
Michael Pavone <pavone@retrodev.com>
parents:
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251 .start_lba = 0, |
3f29e2726522
Added basic support for ISO images for games that only have a data track
Michael Pavone <pavone@retrodev.com>
parents:
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252 .end_lba = file_size(media->f), |
3f29e2726522
Added basic support for ISO images for games that only have a data track
Michael Pavone <pavone@retrodev.com>
parents:
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253 .type = TRACK_DATA |
3f29e2726522
Added basic support for ISO images for games that only have a data track
Michael Pavone <pavone@retrodev.com>
parents:
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254 }; |
3f29e2726522
Added basic support for ISO images for games that only have a data track
Michael Pavone <pavone@retrodev.com>
parents:
2074
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255 media->type = MEDIA_CDROM; |
3f29e2726522
Added basic support for ISO images for games that only have a data track
Michael Pavone <pavone@retrodev.com>
parents:
2074
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256 media->seek = iso_seek; |
3f29e2726522
Added basic support for ISO images for games that only have a data track
Michael Pavone <pavone@retrodev.com>
parents:
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257 media->read = iso_read; |
3f29e2726522
Added basic support for ISO images for games that only have a data track
Michael Pavone <pavone@retrodev.com>
parents:
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258 return media->size; |
3f29e2726522
Added basic support for ISO images for games that only have a data track
Michael Pavone <pavone@retrodev.com>
parents:
2074
diff
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259 } |