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1 /* |
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2 SDL - Simple DirectMedia Layer |
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3 Copyright (C) 1997-2006 Sam Lantinga |
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4 |
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5 This library is free software; you can redistribute it and/or |
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6 modify it under the terms of the GNU Lesser General Public |
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7 License as published by the Free Software Foundation; either |
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8 version 2.1 of the License, or (at your option) any later version. |
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9 |
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10 This library is distributed in the hope that it will be useful, |
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 Lesser General Public License for more details. |
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14 |
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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18 |
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19 Sam Lantinga |
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20 slouken@libsdl.org |
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21 */ |
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22 #include "SDL_config.h" |
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23 |
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24 #ifdef SDL_CDROM_LINUX |
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25 |
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26 /* Functions for system-level CD-ROM audio control */ |
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27 |
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28 #include <string.h> /* For strerror() */ |
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29 #include <sys/types.h> |
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30 #include <sys/stat.h> |
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31 #include <sys/ioctl.h> |
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32 #include <fcntl.h> |
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33 #include <errno.h> |
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34 #include <unistd.h> |
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35 #ifdef __LINUX__ |
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36 #ifdef HAVE_LINUX_VERSION_H |
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37 /* linux 2.6.9 workaround */ |
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38 #include <linux/version.h> |
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39 #if LINUX_VERSION_CODE == KERNEL_VERSION(2,6,9) |
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40 #include <asm/types.h> |
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41 #define __le64 __u64 |
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42 #define __le32 __u32 |
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43 #define __le16 __u16 |
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44 #define __be64 __u64 |
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45 #define __be32 __u32 |
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46 #define __be16 __u16 |
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47 #endif /* linux 2.6.9 workaround */ |
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48 #endif /* HAVE_LINUX_VERSION_H */ |
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49 #include <linux/cdrom.h> |
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50 #endif |
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51 #ifdef __SVR4 |
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52 #include <sys/cdio.h> |
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53 #endif |
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54 |
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55 /* Define this to use the alternative getmntent() code */ |
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56 #ifndef __SVR4 |
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57 #define USE_MNTENT |
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58 #endif |
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59 |
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60 #ifdef USE_MNTENT |
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61 #if defined(__USLC__) |
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62 #include <sys/mntent.h> |
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63 #else |
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64 #include <mntent.h> |
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65 #endif |
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66 |
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67 #ifndef _PATH_MNTTAB |
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68 #ifdef MNTTAB |
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69 #define _PATH_MNTTAB MNTTAB |
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70 #else |
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71 #define _PATH_MNTTAB "/etc/fstab" |
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72 #endif |
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73 #endif /* !_PATH_MNTTAB */ |
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74 |
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75 #ifndef _PATH_MOUNTED |
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76 #define _PATH_MOUNTED "/etc/mtab" |
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77 #endif /* !_PATH_MOUNTED */ |
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78 |
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79 #ifndef MNTTYPE_CDROM |
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80 #define MNTTYPE_CDROM "iso9660" |
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81 #endif |
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82 #ifndef MNTTYPE_SUPER |
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83 #define MNTTYPE_SUPER "supermount" |
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84 #endif |
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85 #endif /* USE_MNTENT */ |
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86 |
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87 #include "SDL_cdrom.h" |
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88 #include "../SDL_syscdrom.h" |
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89 |
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90 |
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91 /* The maximum number of CD-ROM drives we'll detect */ |
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92 #define MAX_DRIVES 16 |
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93 |
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94 /* A list of available CD-ROM drives */ |
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95 static char *SDL_cdlist[MAX_DRIVES]; |
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96 static dev_t SDL_cdmode[MAX_DRIVES]; |
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97 |
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98 /* The system-dependent CD control functions */ |
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99 static const char *SDL_SYS_CDName(int drive); |
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100 static int SDL_SYS_CDOpen(int drive); |
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101 static int SDL_SYS_CDGetTOC(SDL_CD *cdrom); |
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102 static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position); |
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103 static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length); |
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104 static int SDL_SYS_CDPause(SDL_CD *cdrom); |
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105 static int SDL_SYS_CDResume(SDL_CD *cdrom); |
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106 static int SDL_SYS_CDStop(SDL_CD *cdrom); |
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107 static int SDL_SYS_CDEject(SDL_CD *cdrom); |
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108 static void SDL_SYS_CDClose(SDL_CD *cdrom); |
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109 |
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110 /* Some ioctl() errno values which occur when the tray is empty */ |
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111 #ifndef ENOMEDIUM |
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112 #define ENOMEDIUM ENOENT |
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113 #endif |
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114 #define ERRNO_TRAYEMPTY(errno) \ |
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115 ((errno == EIO) || (errno == ENOENT) || \ |
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116 (errno == EINVAL) || (errno == ENOMEDIUM)) |
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117 |
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118 /* Check a drive to see if it is a CD-ROM */ |
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119 static int CheckDrive(char *drive, char *mnttype, struct stat *stbuf) |
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120 { |
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121 int is_cd, cdfd; |
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122 struct cdrom_subchnl info; |
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123 |
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124 /* If it doesn't exist, return -1 */ |
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125 if ( stat(drive, stbuf) < 0 ) { |
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126 return(-1); |
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127 } |
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128 |
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129 /* If it does exist, verify that it's an available CD-ROM */ |
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130 is_cd = 0; |
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131 if ( S_ISCHR(stbuf->st_mode) || S_ISBLK(stbuf->st_mode) ) { |
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132 cdfd = open(drive, (O_RDONLY|O_NONBLOCK), 0); |
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133 if ( cdfd >= 0 ) { |
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134 info.cdsc_format = CDROM_MSF; |
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135 /* Under Linux, EIO occurs when a disk is not present. |
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136 */ |
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137 if ( (ioctl(cdfd, CDROMSUBCHNL, &info) == 0) || |
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138 ERRNO_TRAYEMPTY(errno) ) { |
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139 is_cd = 1; |
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140 } |
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141 close(cdfd); |
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142 } |
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143 #ifdef USE_MNTENT |
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144 /* Even if we can't read it, it might be mounted */ |
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145 else if ( mnttype && (SDL_strcmp(mnttype, MNTTYPE_CDROM) == 0) ) { |
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146 is_cd = 1; |
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147 } |
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148 #endif |
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149 } |
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150 return(is_cd); |
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151 } |
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152 |
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153 /* Add a CD-ROM drive to our list of valid drives */ |
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154 static void AddDrive(char *drive, struct stat *stbuf) |
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155 { |
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156 int i; |
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157 |
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158 if ( SDL_numcds < MAX_DRIVES ) { |
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159 /* Check to make sure it's not already in our list. |
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160 This can happen when we see a drive via symbolic link. |
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161 */ |
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162 for ( i=0; i<SDL_numcds; ++i ) { |
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163 if ( stbuf->st_rdev == SDL_cdmode[i] ) { |
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164 #ifdef DEBUG_CDROM |
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165 fprintf(stderr, "Duplicate drive detected: %s == %s\n", drive, SDL_cdlist[i]); |
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166 #endif |
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167 return; |
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168 } |
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169 } |
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170 |
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171 /* Add this drive to our list */ |
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172 i = SDL_numcds; |
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173 SDL_cdlist[i] = SDL_strdup(drive); |
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174 if ( SDL_cdlist[i] == NULL ) { |
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175 SDL_OutOfMemory(); |
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176 return; |
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177 } |
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178 SDL_cdmode[i] = stbuf->st_rdev; |
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179 ++SDL_numcds; |
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180 #ifdef DEBUG_CDROM |
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181 fprintf(stderr, "Added CD-ROM drive: %s\n", drive); |
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182 #endif |
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183 } |
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184 } |
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185 |
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186 #ifdef USE_MNTENT |
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187 static void CheckMounts(const char *mtab) |
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188 { |
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189 FILE *mntfp; |
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190 struct mntent *mntent; |
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191 struct stat stbuf; |
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192 |
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193 mntfp = setmntent(mtab, "r"); |
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194 if ( mntfp != NULL ) { |
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195 char *tmp; |
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196 char *mnt_type; |
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197 size_t mnt_type_len; |
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198 char *mnt_dev; |
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199 size_t mnt_dev_len; |
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200 |
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201 while ( (mntent=getmntent(mntfp)) != NULL ) { |
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202 mnt_type_len = SDL_strlen(mntent->mnt_type) + 1; |
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203 mnt_type = SDL_stack_alloc(char, mnt_type_len); |
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204 if (mnt_type == NULL) |
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205 continue; /* maybe you'll get lucky next time. */ |
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206 |
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207 mnt_dev_len = SDL_strlen(mntent->mnt_fsname) + 1; |
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208 mnt_dev = SDL_stack_alloc(char, mnt_dev_len); |
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209 if (mnt_dev == NULL) { |
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210 SDL_stack_free(mnt_type); |
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211 continue; |
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212 } |
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213 |
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214 SDL_strlcpy(mnt_type, mntent->mnt_type, mnt_type_len); |
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215 SDL_strlcpy(mnt_dev, mntent->mnt_fsname, mnt_dev_len); |
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216 |
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217 /* Handle "supermount" filesystem mounts */ |
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218 if ( SDL_strcmp(mnt_type, MNTTYPE_SUPER) == 0 ) { |
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219 tmp = SDL_strstr(mntent->mnt_opts, "fs="); |
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220 if ( tmp ) { |
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221 SDL_stack_free(mnt_type); |
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222 mnt_type = SDL_strdup(tmp + SDL_strlen("fs=")); |
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223 if ( mnt_type ) { |
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224 tmp = SDL_strchr(mnt_type, ','); |
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225 if ( tmp ) { |
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226 *tmp = '\0'; |
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227 } |
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228 } |
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229 } |
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230 tmp = SDL_strstr(mntent->mnt_opts, "dev="); |
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231 if ( tmp ) { |
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232 SDL_stack_free(mnt_dev); |
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233 mnt_dev = SDL_strdup(tmp + SDL_strlen("dev=")); |
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234 if ( mnt_dev ) { |
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235 tmp = SDL_strchr(mnt_dev, ','); |
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236 if ( tmp ) { |
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237 *tmp = '\0'; |
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238 } |
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239 } |
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240 } |
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241 } |
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242 if ( SDL_strcmp(mnt_type, MNTTYPE_CDROM) == 0 ) { |
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243 #ifdef DEBUG_CDROM |
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244 fprintf(stderr, "Checking mount path from %s: %s mounted on %s of %s\n", |
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245 mtab, mnt_dev, mntent->mnt_dir, mnt_type); |
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246 #endif |
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247 if (CheckDrive(mnt_dev, mnt_type, &stbuf) > 0) { |
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248 AddDrive(mnt_dev, &stbuf); |
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249 } |
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250 } |
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251 SDL_stack_free(mnt_dev); |
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252 SDL_stack_free(mnt_type); |
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253 } |
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254 endmntent(mntfp); |
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255 } |
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256 } |
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257 #endif /* USE_MNTENT */ |
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258 |
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259 int SDL_SYS_CDInit(void) |
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260 { |
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261 /* checklist: /dev/cdrom, /dev/hd?, /dev/scd? /dev/sr? */ |
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262 static char *checklist[] = { |
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263 "cdrom", "?a hd?", "?0 scd?", "?0 sr?", NULL |
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264 }; |
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265 char *SDLcdrom; |
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266 int i, j, exists; |
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267 char drive[32]; |
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268 struct stat stbuf; |
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269 |
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270 /* Fill in our driver capabilities */ |
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271 SDL_CDcaps.Name = SDL_SYS_CDName; |
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272 SDL_CDcaps.Open = SDL_SYS_CDOpen; |
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273 SDL_CDcaps.GetTOC = SDL_SYS_CDGetTOC; |
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274 SDL_CDcaps.Status = SDL_SYS_CDStatus; |
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275 SDL_CDcaps.Play = SDL_SYS_CDPlay; |
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276 SDL_CDcaps.Pause = SDL_SYS_CDPause; |
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277 SDL_CDcaps.Resume = SDL_SYS_CDResume; |
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278 SDL_CDcaps.Stop = SDL_SYS_CDStop; |
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279 SDL_CDcaps.Eject = SDL_SYS_CDEject; |
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280 SDL_CDcaps.Close = SDL_SYS_CDClose; |
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281 |
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282 /* Look in the environment for our CD-ROM drive list */ |
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283 SDLcdrom = SDL_getenv("SDL_CDROM"); /* ':' separated list of devices */ |
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284 if ( SDLcdrom != NULL ) { |
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285 char *cdpath, *delim; |
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286 size_t len = SDL_strlen(SDLcdrom)+1; |
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287 cdpath = SDL_stack_alloc(char, len); |
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288 if ( cdpath != NULL ) { |
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289 SDL_strlcpy(cdpath, SDLcdrom, len); |
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290 SDLcdrom = cdpath; |
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291 do { |
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292 delim = SDL_strchr(SDLcdrom, ':'); |
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293 if ( delim ) { |
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294 *delim++ = '\0'; |
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295 } |
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296 #ifdef DEBUG_CDROM |
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297 fprintf(stderr, "Checking CD-ROM drive from SDL_CDROM: %s\n", SDLcdrom); |
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298 #endif |
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299 if ( CheckDrive(SDLcdrom, NULL, &stbuf) > 0 ) { |
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300 AddDrive(SDLcdrom, &stbuf); |
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301 } |
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302 if ( delim ) { |
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303 SDLcdrom = delim; |
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304 } else { |
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305 SDLcdrom = NULL; |
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306 } |
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307 } while ( SDLcdrom ); |
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308 SDL_stack_free(cdpath); |
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309 } |
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310 |
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311 /* If we found our drives, there's nothing left to do */ |
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312 if ( SDL_numcds > 0 ) { |
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313 return(0); |
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314 } |
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315 } |
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316 |
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317 #ifdef USE_MNTENT |
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318 /* Check /dev/cdrom first :-) */ |
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319 if (CheckDrive("/dev/cdrom", NULL, &stbuf) > 0) { |
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320 AddDrive("/dev/cdrom", &stbuf); |
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321 } |
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322 |
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323 /* Now check the currently mounted CD drives */ |
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324 CheckMounts(_PATH_MOUNTED); |
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325 |
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326 /* Finally check possible mountable drives in /etc/fstab */ |
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327 CheckMounts(_PATH_MNTTAB); |
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328 |
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329 /* If we found our drives, there's nothing left to do */ |
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330 if ( SDL_numcds > 0 ) { |
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331 return(0); |
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332 } |
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333 #endif /* USE_MNTENT */ |
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334 |
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335 /* Scan the system for CD-ROM drives. |
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336 Not always 100% reliable, so use the USE_MNTENT code above first. |
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337 */ |
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338 for ( i=0; checklist[i]; ++i ) { |
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339 if ( checklist[i][0] == '?' ) { |
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340 char *insert; |
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341 exists = 1; |
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342 for ( j=checklist[i][1]; exists; ++j ) { |
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343 SDL_snprintf(drive, SDL_arraysize(drive), "/dev/%s", &checklist[i][3]); |
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344 insert = SDL_strchr(drive, '?'); |
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345 if ( insert != NULL ) { |
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346 *insert = j; |
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347 } |
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348 #ifdef DEBUG_CDROM |
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349 fprintf(stderr, "Checking possible CD-ROM drive: %s\n", drive); |
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350 #endif |
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351 switch (CheckDrive(drive, NULL, &stbuf)) { |
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352 /* Drive exists and is a CD-ROM */ |
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353 case 1: |
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354 AddDrive(drive, &stbuf); |
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355 break; |
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356 /* Drive exists, but isn't a CD-ROM */ |
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357 case 0: |
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358 break; |
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359 /* Drive doesn't exist */ |
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360 case -1: |
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361 exists = 0; |
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362 break; |
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363 } |
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364 } |
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365 } else { |
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366 SDL_snprintf(drive, SDL_arraysize(drive), "/dev/%s", checklist[i]); |
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367 #ifdef DEBUG_CDROM |
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368 fprintf(stderr, "Checking possible CD-ROM drive: %s\n", drive); |
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369 #endif |
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370 if ( CheckDrive(drive, NULL, &stbuf) > 0 ) { |
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371 AddDrive(drive, &stbuf); |
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372 } |
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373 } |
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374 } |
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375 return(0); |
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376 } |
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377 |
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378 /* General ioctl() CD-ROM command function */ |
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379 static int SDL_SYS_CDioctl(int id, int command, void *arg) |
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380 { |
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381 int retval; |
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382 |
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383 retval = ioctl(id, command, arg); |
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384 if ( retval < 0 ) { |
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385 SDL_SetError("ioctl() error: %s", strerror(errno)); |
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386 } |
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387 return(retval); |
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388 } |
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389 |
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390 static const char *SDL_SYS_CDName(int drive) |
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391 { |
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392 return(SDL_cdlist[drive]); |
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393 } |
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394 |
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395 static int SDL_SYS_CDOpen(int drive) |
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396 { |
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397 return(open(SDL_cdlist[drive], (O_RDONLY|O_NONBLOCK), 0)); |
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398 } |
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399 |
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400 static int SDL_SYS_CDGetTOC(SDL_CD *cdrom) |
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401 { |
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402 struct cdrom_tochdr toc; |
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403 int i, okay; |
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404 struct cdrom_tocentry entry; |
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405 |
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406 okay = 0; |
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407 if ( SDL_SYS_CDioctl(cdrom->id, CDROMREADTOCHDR, &toc) == 0 ) { |
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408 cdrom->numtracks = toc.cdth_trk1-toc.cdth_trk0+1; |
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409 if ( cdrom->numtracks > SDL_MAX_TRACKS ) { |
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410 cdrom->numtracks = SDL_MAX_TRACKS; |
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411 } |
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412 /* Read all the track TOC entries */ |
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413 for ( i=0; i<=cdrom->numtracks; ++i ) { |
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414 if ( i == cdrom->numtracks ) { |
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415 cdrom->track[i].id = CDROM_LEADOUT; |
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416 } else { |
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417 cdrom->track[i].id = toc.cdth_trk0+i; |
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418 } |
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419 entry.cdte_track = cdrom->track[i].id; |
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420 entry.cdte_format = CDROM_MSF; |
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421 if ( SDL_SYS_CDioctl(cdrom->id, CDROMREADTOCENTRY, |
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422 &entry) < 0 ) { |
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423 break; |
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424 } else { |
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425 if ( entry.cdte_ctrl & CDROM_DATA_TRACK ) { |
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426 cdrom->track[i].type = SDL_DATA_TRACK; |
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427 } else { |
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428 cdrom->track[i].type = SDL_AUDIO_TRACK; |
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429 } |
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430 cdrom->track[i].offset = MSF_TO_FRAMES( |
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431 entry.cdte_addr.msf.minute, |
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432 entry.cdte_addr.msf.second, |
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433 entry.cdte_addr.msf.frame); |
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434 cdrom->track[i].length = 0; |
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435 if ( i > 0 ) { |
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436 cdrom->track[i-1].length = |
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437 cdrom->track[i].offset- |
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438 cdrom->track[i-1].offset; |
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439 } |
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440 } |
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441 } |
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442 if ( i == (cdrom->numtracks+1) ) { |
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443 okay = 1; |
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444 } |
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445 } |
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446 return(okay ? 0 : -1); |
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447 } |
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448 |
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449 /* Get CD-ROM status */ |
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450 static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position) |
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451 { |
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452 CDstatus status; |
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453 struct cdrom_tochdr toc; |
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454 struct cdrom_subchnl info; |
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455 |
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456 info.cdsc_format = CDROM_MSF; |
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457 if ( ioctl(cdrom->id, CDROMSUBCHNL, &info) < 0 ) { |
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458 if ( ERRNO_TRAYEMPTY(errno) ) { |
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459 status = CD_TRAYEMPTY; |
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460 } else { |
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461 status = CD_ERROR; |
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462 } |
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463 } else { |
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464 switch (info.cdsc_audiostatus) { |
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465 case CDROM_AUDIO_INVALID: |
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466 case CDROM_AUDIO_NO_STATUS: |
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467 /* Try to determine if there's a CD available */ |
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468 if (ioctl(cdrom->id, CDROMREADTOCHDR, &toc)==0) |
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469 status = CD_STOPPED; |
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470 else |
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471 status = CD_TRAYEMPTY; |
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472 break; |
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473 case CDROM_AUDIO_COMPLETED: |
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474 status = CD_STOPPED; |
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475 break; |
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476 case CDROM_AUDIO_PLAY: |
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477 status = CD_PLAYING; |
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478 break; |
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479 case CDROM_AUDIO_PAUSED: |
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480 /* Workaround buggy CD-ROM drive */ |
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481 if ( info.cdsc_trk == CDROM_LEADOUT ) { |
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482 status = CD_STOPPED; |
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483 } else { |
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484 status = CD_PAUSED; |
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485 } |
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486 break; |
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487 default: |
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488 status = CD_ERROR; |
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489 break; |
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490 } |
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491 } |
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492 if ( position ) { |
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493 if ( status == CD_PLAYING || (status == CD_PAUSED) ) { |
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494 *position = MSF_TO_FRAMES( |
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495 info.cdsc_absaddr.msf.minute, |
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496 info.cdsc_absaddr.msf.second, |
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497 info.cdsc_absaddr.msf.frame); |
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498 } else { |
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499 *position = 0; |
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500 } |
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501 } |
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502 return(status); |
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503 } |
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504 |
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505 /* Start play */ |
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506 static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length) |
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507 { |
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508 struct cdrom_msf playtime; |
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509 |
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510 FRAMES_TO_MSF(start, |
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511 &playtime.cdmsf_min0, &playtime.cdmsf_sec0, &playtime.cdmsf_frame0); |
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512 FRAMES_TO_MSF(start+length, |
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513 &playtime.cdmsf_min1, &playtime.cdmsf_sec1, &playtime.cdmsf_frame1); |
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514 #ifdef DEBUG_CDROM |
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515 fprintf(stderr, "Trying to play from %d:%d:%d to %d:%d:%d\n", |
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516 playtime.cdmsf_min0, playtime.cdmsf_sec0, playtime.cdmsf_frame0, |
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517 playtime.cdmsf_min1, playtime.cdmsf_sec1, playtime.cdmsf_frame1); |
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518 #endif |
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519 return(SDL_SYS_CDioctl(cdrom->id, CDROMPLAYMSF, &playtime)); |
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520 } |
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521 |
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522 /* Pause play */ |
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523 static int SDL_SYS_CDPause(SDL_CD *cdrom) |
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524 { |
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525 return(SDL_SYS_CDioctl(cdrom->id, CDROMPAUSE, 0)); |
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526 } |
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527 |
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528 /* Resume play */ |
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529 static int SDL_SYS_CDResume(SDL_CD *cdrom) |
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530 { |
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531 return(SDL_SYS_CDioctl(cdrom->id, CDROMRESUME, 0)); |
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532 } |
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533 |
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534 /* Stop play */ |
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535 static int SDL_SYS_CDStop(SDL_CD *cdrom) |
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536 { |
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537 return(SDL_SYS_CDioctl(cdrom->id, CDROMSTOP, 0)); |
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538 } |
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539 |
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540 /* Eject the CD-ROM */ |
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541 static int SDL_SYS_CDEject(SDL_CD *cdrom) |
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542 { |
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543 return(SDL_SYS_CDioctl(cdrom->id, CDROMEJECT, 0)); |
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544 } |
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545 |
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546 /* Close the CD-ROM handle */ |
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547 static void SDL_SYS_CDClose(SDL_CD *cdrom) |
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548 { |
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549 close(cdrom->id); |
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550 } |
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551 |
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552 void SDL_SYS_CDQuit(void) |
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553 { |
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554 int i; |
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555 |
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556 if ( SDL_numcds > 0 ) { |
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557 for ( i=0; i<SDL_numcds; ++i ) { |
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558 SDL_free(SDL_cdlist[i]); |
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559 } |
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560 SDL_numcds = 0; |
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561 } |
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562 } |
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563 |
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564 #endif /* SDL_CDROM_LINUX */ |