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annotate cue.c @ 2071:598017ef4b0d segacd

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Fix a few sega cd graphics processor bugs
author Michael Pavone <pavone@retrodev.com>
date Sun, 30 Jan 2022 22:29:04 -0800
parents 07ed42bd7b4c
children c5323c02dde4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2059
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1 #include <ctype.h>
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2
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3 #include "system.h"
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4 #include "util.h"
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5
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6 static char* cmd_start(char *cur)
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7 {
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8 while (*cur && isblank(*cur))
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9 {
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10 cur++;
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11 }
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12 return cur;
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13 }
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14
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15 static char* next_line(char *cur)
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16 {
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17 while (*cur && *cur != '\n')
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18 {
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19 cur++;
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20 }
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21 if (*cur) {
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22 return cur + 1;
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23 }
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24 return NULL;
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25 }
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26
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27 static uint32_t timecode_to_lba(char *timecode)
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28 {
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29 char *end;
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30 int seconds = 0, frames = 0;
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31 int minutes = strtol(timecode, &end, 10);
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32 if (end) {
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33 timecode = end + 1;
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34 seconds = strtol(timecode, &end, 10);
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35 if (end) {
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36 timecode = end + 1;
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37 frames = strtol(timecode, NULL, 10);
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38 }
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39 }
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40 seconds += minutes * 60;
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41 return seconds * 75 + frames;
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42
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43 }
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44
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45 uint8_t parse_cue(system_media *media)
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46 {
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47 char *line = media->buffer;
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48 media->num_tracks = 0;
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49 do {
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50 char *cmd = cmd_start(line);
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51 if (cmd) {
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52 if (startswith(cmd, "TRACK ")) {
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53 media->num_tracks++;
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54 }
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55 line = next_line(cmd);
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56 } else {
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57 line = NULL;
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58 }
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59 } while (line);
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60 track_info *tracks = calloc(sizeof(track_info), media->num_tracks);
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61 media->tracks = tracks;
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62 line = media->buffer;
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63 int track = -1;
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64 do {
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65 char *cmd = cmd_start(line);
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66 if (cmd) {
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67 if (startswith(cmd, "TRACK ")) {
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68 track++;
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69 cmd += 6;
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70 char *end;
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71 int file_track = strtol(cmd, &end, 10);
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72 if (file_track != (track + 1)) {
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73 warning("Expected track %d, but found track %d in CUE sheet\n", track + 1, file_track);
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74 }
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75 cmd = cmd_start(end);
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76 if (cmd) {
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77 tracks[track].type = startswith(cmd, "AUDIO") ? TRACK_AUDIO : TRACK_DATA;
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78 }
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79 } else if (startswith(cmd, "FILE ")) {
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80 if (media->f) {
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81 warning("CUE sheets with multiple FILE commands are not supported\n");
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82 } else {
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83 cmd += 5;
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84 cmd = strchr(cmd, '"');
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85 if (cmd) {
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86 cmd++;
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87 char *end = strchr(cmd, '"');
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88 if (end) {
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89 char *fname;
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90 //TODO: zipped BIN/CUE support
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91 if (is_absolute_path(cmd)) {
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92 fname = malloc(end-cmd + 1);
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93 memcpy(fname, cmd, end-cmd);
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94 fname[end-cmd] = 0;
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95 } else {
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96 size_t dirlen = strlen(media->dir);
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97 fname = malloc(dirlen + 1 + (end-cmd) + 1);
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98 memcpy(fname, media->dir, dirlen);
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99 fname[dirlen] = PATH_SEP[0];
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100 memcpy(fname + dirlen + 1, cmd, end-cmd);
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101 fname[dirlen + 1 + (end-cmd)] = 0;
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102 }
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103 media->f = fopen(fname, "rb");
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104 if (!media->f) {
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105 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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106 }
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107 free(fname);
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108 }
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109 }
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110 }
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111 } else if (track >= 0) {
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112 if (startswith(cmd, "PREGAP ")) {
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113 tracks[track].fake_pregap = timecode_to_lba(cmd + 7);
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114 } else if (startswith(cmd, "INDEX ")) {
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115 char *after;
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116 int index = strtol(cmd + 6, &after, 10);
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117 if (!index) {
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118 tracks[track].pregap_lba = timecode_to_lba(after);
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119 } else if (index == 1) {
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120 tracks[track].start_lba = timecode_to_lba(after);
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121 }
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122 }
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123 }
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124 if (cmd) {
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125 line = next_line(cmd);
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126 } else {
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127 line = NULL;
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128 }
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129 } else {
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130 line = NULL;
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131 }
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132 } while (line);
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133 for (uint32_t i = 0; i < (media->num_tracks - 1); i++)
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134 {
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135 uint32_t next = i + 1;
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136 tracks[i].end_lba = tracks[next].pregap_lba ? tracks[next].pregap_lba : tracks[next].start_lba;
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137 }
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138 if (media->f) {
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139 //end of last track is implicitly defined by file size
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140 tracks[media->num_tracks-1].end_lba = file_size(media->f) / 2352;
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141 //replace cue sheet with first sector
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142 free(media->buffer);
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143 media->buffer = calloc(2048, 1);
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144 if (tracks[0].type = TRACK_DATA) {
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145 // 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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parents: 2061
diff changeset
146 uint8_t msf[3];
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
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parents: 2061
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147 fseek(media->f, 12, SEEK_SET);
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
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parents: 2061
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148 if (sizeof(msf) == fread(msf, 1, sizeof(msf), media->f)) {
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
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parents: 2061
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149 tracks[0].fake_pregap = msf[2] + (msf[0] * 60 + msf[1]) * 75;
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
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parents: 2061
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150 }
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
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parents: 2061
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151 }
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
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parents: 2061
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152
2059
6399a776e981 Add basic support for BIN/CUE images
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parents:
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153 fseek(media->f, 16, SEEK_SET);
6399a776e981 Add basic support for BIN/CUE images
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parents:
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154 media->size = fread(media->buffer, 1, 2048, media->f);
6399a776e981 Add basic support for BIN/CUE images
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parents:
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155 }
2061
7c1760b5b3e5 Implemented basic TOC functionality of CDD MCU
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parents: 2059
diff changeset
156 uint8_t valid = tracks > 0 && media->f != NULL;
7c1760b5b3e5 Implemented basic TOC functionality of CDD MCU
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parents: 2059
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157 media->type = valid ? MEDIA_CDROM : MEDIA_CART;
7c1760b5b3e5 Implemented basic TOC functionality of CDD MCU
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158 return valid;
2059
6399a776e981 Add basic support for BIN/CUE images
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parents:
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159 }