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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001 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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@devolution.com
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21 */
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22
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 /* Functions for system-level CD-ROM audio control */
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29
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30 #include <sys/types.h>
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31 #include <stdlib.h>
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32 #include <sys/stat.h>
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33 #include <sys/ioctl.h>
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34 #include <fcntl.h>
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35 #include <stdio.h>
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36 #include <string.h>
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37 #include <errno.h>
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38 #include <unistd.h>
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39 #ifdef __linux__
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40 #include <linux/cdrom.h>
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41 #endif
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42 #ifdef __SVR4
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43 #include <sys/cdio.h>
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44 #endif
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45
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46 /* Define this to use the alternative getmntent() code */
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47 #ifndef __SVR4
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48 #define USE_MNTENT
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49 #endif
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50
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51 #ifdef USE_MNTENT
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52 #if defined(__USLC__)
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53 #include <sys/mntent.h>
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54 #else
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55 #include <mntent.h>
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56 #endif
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57
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58 #ifndef _PATH_MNTTAB
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59 #ifdef MNTTAB
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60 #define _PATH_MNTTAB MNTTAB
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61 #else
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62 #define _PATH_MNTTAB "/etc/fstab"
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63 #endif
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64 #endif /* !_PATH_MNTTAB */
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65
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66 #ifndef _PATH_MOUNTED
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67 #define _PATH_MOUNTED "/etc/mtab"
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68 #endif /* !_PATH_MOUNTED */
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69
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70 #ifndef MNTTYPE_CDROM
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71 #define MNTTYPE_CDROM "iso9660"
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72 #endif
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73 #ifndef MNTTYPE_SUPER
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74 #define MNTTYPE_SUPER "supermount"
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75 #endif
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76 #endif /* USE_MNTENT */
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77
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78 #include "SDL_error.h"
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79 #include "SDL_cdrom.h"
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80 #include "SDL_syscdrom.h"
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81
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82
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83 /* The maximum number of CD-ROM drives we'll detect */
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84 #define MAX_DRIVES 16
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85
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86 /* A list of available CD-ROM drives */
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87 static char *SDL_cdlist[MAX_DRIVES];
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88 static dev_t SDL_cdmode[MAX_DRIVES];
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89
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90 /* The system-dependent CD control functions */
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91 static const char *SDL_SYS_CDName(int drive);
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92 static int SDL_SYS_CDOpen(int drive);
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93 static int SDL_SYS_CDGetTOC(SDL_CD *cdrom);
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94 static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position);
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95 static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length);
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96 static int SDL_SYS_CDPause(SDL_CD *cdrom);
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97 static int SDL_SYS_CDResume(SDL_CD *cdrom);
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98 static int SDL_SYS_CDStop(SDL_CD *cdrom);
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99 static int SDL_SYS_CDEject(SDL_CD *cdrom);
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100 static void SDL_SYS_CDClose(SDL_CD *cdrom);
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101
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102 /* Some ioctl() errno values which occur when the tray is empty */
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103 #define ERRNO_TRAYEMPTY(errno) \
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104 ((errno == EIO) || (errno == ENOENT) || (errno == EINVAL))
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105
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106 /* Check a drive to see if it is a CD-ROM */
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107 static int CheckDrive(char *drive, char *mnttype, struct stat *stbuf)
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108 {
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109 int is_cd, cdfd;
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110 struct cdrom_subchnl info;
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111
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112 /* If it doesn't exist, return -1 */
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113 if ( stat(drive, stbuf) < 0 ) {
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114 return(-1);
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115 }
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116
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117 /* If it does exist, verify that it's an available CD-ROM */
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118 is_cd = 0;
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119 if ( S_ISCHR(stbuf->st_mode) || S_ISBLK(stbuf->st_mode) ) {
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120 cdfd = open(drive, (O_RDONLY|O_EXCL|O_NONBLOCK), 0);
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121 if ( cdfd >= 0 ) {
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122 info.cdsc_format = CDROM_MSF;
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123 /* Under Linux, EIO occurs when a disk is not present.
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124 */
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125 if ( (ioctl(cdfd, CDROMSUBCHNL, &info) == 0) ||
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126 ERRNO_TRAYEMPTY(errno) ) {
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127 is_cd = 1;
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128 }
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129 close(cdfd);
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130 }
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131 #ifdef USE_MNTENT
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132 /* Even if we can't read it, it might be mounted */
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133 else if ( mnttype && (strcmp(mnttype, MNTTYPE_CDROM) == 0) ) {
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134 is_cd = 1;
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135 }
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136 #endif
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137 }
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138 return(is_cd);
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139 }
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140
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141 /* Add a CD-ROM drive to our list of valid drives */
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142 static void AddDrive(char *drive, struct stat *stbuf)
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143 {
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144 int i;
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145
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146 if ( SDL_numcds < MAX_DRIVES ) {
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147 /* Check to make sure it's not already in our list.
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148 This can happen when we see a drive via symbolic link.
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149 */
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150 for ( i=0; i<SDL_numcds; ++i ) {
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151 if ( stbuf->st_rdev == SDL_cdmode[i] ) {
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152 #ifdef DEBUG_CDROM
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153 fprintf(stderr, "Duplicate drive detected: %s == %s\n", drive, SDL_cdlist[i]);
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154 #endif
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155 return;
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156 }
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157 }
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158
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159 /* Add this drive to our list */
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160 i = SDL_numcds;
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161 SDL_cdlist[i] = (char *)malloc(strlen(drive)+1);
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162 if ( SDL_cdlist[i] == NULL ) {
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163 SDL_OutOfMemory();
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164 return;
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165 }
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166 strcpy(SDL_cdlist[i], drive);
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167 SDL_cdmode[i] = stbuf->st_rdev;
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168 ++SDL_numcds;
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169 #ifdef DEBUG_CDROM
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170 fprintf(stderr, "Added CD-ROM drive: %s\n", drive);
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171 #endif
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172 }
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173 }
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174
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175 #ifdef USE_MNTENT
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176 static void CheckMounts(const char *mtab)
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177 {
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178 FILE *mntfp;
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179 struct mntent *mntent;
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180 struct stat stbuf;
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181
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182 mntfp = setmntent(mtab, "r");
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183 if ( mntfp != NULL ) {
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184 char *tmp, mnt_type[32], mnt_dev[1024];
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185
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186 while ( (mntent=getmntent(mntfp)) != NULL ) {
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187 /* Warning, possible buffer overflow.. */
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188 strcpy(mnt_type, mntent->mnt_type);
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189 strcpy(mnt_dev, mntent->mnt_fsname);
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190
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191 /* Handle "supermount" filesystem mounts */
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192 if ( strcmp(mnt_type, MNTTYPE_SUPER) == 0 ) {
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193 tmp = strstr(mntent->mnt_opts, "fs=");
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194 if ( tmp ) {
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195 strcpy(mnt_type, tmp+strlen("fs="));
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196 tmp = strchr(mnt_type, ',');
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197 if ( tmp ) {
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198 *tmp = '\0';
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199 }
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200 }
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201 tmp = strstr(mntent->mnt_opts, "dev=");
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202 if ( tmp ) {
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203 strcpy(mnt_dev, tmp+strlen("dev="));
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204 tmp = strchr(mnt_dev, ',');
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205 if ( tmp ) {
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206 *tmp = '\0';
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207 }
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208 }
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209 }
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210 if ( strcmp(mnt_type, MNTTYPE_CDROM) == 0 ) {
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211 #ifdef DEBUG_CDROM
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212 fprintf(stderr, "Checking mount path from %s: %s mounted on %s of %s\n",
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213 mtab, mnt_dev, mntent->mnt_dir, mnt_type);
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214 #endif
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215 if (CheckDrive(mnt_dev, mnt_type, &stbuf) > 0) {
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216 AddDrive(mnt_dev, &stbuf);
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217 }
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218 }
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219 }
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220 endmntent(mntfp);
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221 }
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222 }
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223 #endif /* USE_MNTENT */
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224
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225 int SDL_SYS_CDInit(void)
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226 {
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227 /* checklist: /dev/cdrom, /dev/hd?, /dev/scd? /dev/sr? */
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228 static char *checklist[] = {
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229 "cdrom", "?a hd?", "?0 scd?", "?0 sr?", NULL
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230 };
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231 char *SDLcdrom;
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232 int i, j, exists;
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233 char drive[32];
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234 struct stat stbuf;
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235
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236 /* Fill in our driver capabilities */
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237 SDL_CDcaps.Name = SDL_SYS_CDName;
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238 SDL_CDcaps.Open = SDL_SYS_CDOpen;
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239 SDL_CDcaps.GetTOC = SDL_SYS_CDGetTOC;
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240 SDL_CDcaps.Status = SDL_SYS_CDStatus;
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241 SDL_CDcaps.Play = SDL_SYS_CDPlay;
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242 SDL_CDcaps.Pause = SDL_SYS_CDPause;
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243 SDL_CDcaps.Resume = SDL_SYS_CDResume;
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244 SDL_CDcaps.Stop = SDL_SYS_CDStop;
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245 SDL_CDcaps.Eject = SDL_SYS_CDEject;
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246 SDL_CDcaps.Close = SDL_SYS_CDClose;
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247
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248 /* Look in the environment for our CD-ROM drive list */
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249 SDLcdrom = getenv("SDL_CDROM"); /* ':' separated list of devices */
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250 if ( SDLcdrom != NULL ) {
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251 char *cdpath, *delim;
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252 cdpath = malloc(strlen(SDLcdrom)+1);
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253 if ( cdpath != NULL ) {
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254 strcpy(cdpath, SDLcdrom);
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255 SDLcdrom = cdpath;
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256 do {
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257 delim = strchr(SDLcdrom, ':');
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258 if ( delim ) {
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259 *delim++ = '\0';
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260 }
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261 #ifdef DEBUG_CDROM
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262 fprintf(stderr, "Checking CD-ROM drive from SDL_CDROM: %s\n", SDLcdrom);
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263 #endif
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264 if ( CheckDrive(SDLcdrom, NULL, &stbuf) > 0 ) {
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265 AddDrive(SDLcdrom, &stbuf);
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266 }
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267 if ( delim ) {
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268 SDLcdrom = delim;
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269 } else {
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270 SDLcdrom = NULL;
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271 }
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272 } while ( SDLcdrom );
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273 free(cdpath);
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274 }
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275
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276 /* If we found our drives, there's nothing left to do */
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277 if ( SDL_numcds > 0 ) {
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278 return(0);
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279 }
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280 }
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281
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282 #ifdef USE_MNTENT
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283 /* Check /dev/cdrom first :-) */
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284 if (CheckDrive("/dev/cdrom", NULL, &stbuf) > 0) {
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285 AddDrive("/dev/cdrom", &stbuf);
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286 }
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287
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288 /* Now check the currently mounted CD drives */
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289 CheckMounts(_PATH_MOUNTED);
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290
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291 /* Finally check possible mountable drives in /etc/fstab */
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292 CheckMounts(_PATH_MNTTAB);
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293
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294 /* If we found our drives, there's nothing left to do */
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295 if ( SDL_numcds > 0 ) {
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296 return(0);
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297 }
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298 #endif /* USE_MNTENT */
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299
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300 /* Scan the system for CD-ROM drives.
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301 Not always 100% reliable, so use the USE_MNTENT code above first.
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302 */
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303 for ( i=0; checklist[i]; ++i ) {
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304 if ( checklist[i][0] == '?' ) {
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305 char *insert;
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306 exists = 1;
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307 for ( j=checklist[i][1]; exists; ++j ) {
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308 sprintf(drive, "/dev/%s", &checklist[i][3]);
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309 insert = strchr(drive, '?');
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310 if ( insert != NULL ) {
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311 *insert = j;
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312 }
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313 #ifdef DEBUG_CDROM
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314 fprintf(stderr, "Checking possible CD-ROM drive: %s\n", drive);
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315 #endif
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316 switch (CheckDrive(drive, NULL, &stbuf)) {
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317 /* Drive exists and is a CD-ROM */
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318 case 1:
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319 AddDrive(drive, &stbuf);
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320 break;
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321 /* Drive exists, but isn't a CD-ROM */
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322 case 0:
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323 break;
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324 /* Drive doesn't exist */
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325 case -1:
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326 exists = 0;
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327 break;
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328 }
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329 }
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330 } else {
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331 sprintf(drive, "/dev/%s", checklist[i]);
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332 #ifdef DEBUG_CDROM
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333 fprintf(stderr, "Checking possible CD-ROM drive: %s\n", drive);
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334 #endif
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335 if ( CheckDrive(drive, NULL, &stbuf) > 0 ) {
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336 AddDrive(drive, &stbuf);
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337 }
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338 }
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339 }
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340 return(0);
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341 }
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342
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343 /* General ioctl() CD-ROM command function */
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344 static int SDL_SYS_CDioctl(int id, int command, void *arg)
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345 {
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346 int retval;
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347
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348 retval = ioctl(id, command, arg);
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349 if ( retval < 0 ) {
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350 SDL_SetError("ioctl() error: %s", strerror(errno));
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351 }
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352 return(retval);
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353 }
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354
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355 static const char *SDL_SYS_CDName(int drive)
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356 {
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357 return(SDL_cdlist[drive]);
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358 }
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359
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360 static int SDL_SYS_CDOpen(int drive)
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361 {
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362 return(open(SDL_cdlist[drive], (O_RDONLY|O_EXCL|O_NONBLOCK), 0));
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363 }
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364
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365 static int SDL_SYS_CDGetTOC(SDL_CD *cdrom)
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366 {
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367 struct cdrom_tochdr toc;
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368 int i, okay;
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369 struct cdrom_tocentry entry;
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370
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371 okay = 0;
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372 if ( SDL_SYS_CDioctl(cdrom->id, CDROMREADTOCHDR, &toc) == 0 ) {
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373 cdrom->numtracks = toc.cdth_trk1-toc.cdth_trk0+1;
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374 if ( cdrom->numtracks > SDL_MAX_TRACKS ) {
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375 cdrom->numtracks = SDL_MAX_TRACKS;
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376 }
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377 /* Read all the track TOC entries */
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378 for ( i=0; i<=cdrom->numtracks; ++i ) {
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379 if ( i == cdrom->numtracks ) {
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380 cdrom->track[i].id = CDROM_LEADOUT;
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381 } else {
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382 cdrom->track[i].id = toc.cdth_trk0+i;
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383 }
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384 entry.cdte_track = cdrom->track[i].id;
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385 entry.cdte_format = CDROM_MSF;
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386 if ( SDL_SYS_CDioctl(cdrom->id, CDROMREADTOCENTRY,
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387 &entry) < 0 ) {
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388 break;
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389 } else {
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390 if ( entry.cdte_ctrl & CDROM_DATA_TRACK ) {
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391 cdrom->track[i].type = SDL_DATA_TRACK;
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392 } else {
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393 cdrom->track[i].type = SDL_AUDIO_TRACK;
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394 }
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395 cdrom->track[i].offset = MSF_TO_FRAMES(
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396 entry.cdte_addr.msf.minute,
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397 entry.cdte_addr.msf.second,
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398 entry.cdte_addr.msf.frame);
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399 cdrom->track[i].length = 0;
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400 if ( i > 0 ) {
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401 cdrom->track[i-1].length =
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402 cdrom->track[i].offset-
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403 cdrom->track[i-1].offset;
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404 }
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405 }
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406 }
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407 if ( i == (cdrom->numtracks+1) ) {
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408 okay = 1;
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409 }
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410 }
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411 return(okay ? 0 : -1);
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412 }
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413
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414 /* Get CD-ROM status */
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415 static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position)
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416 {
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417 CDstatus status;
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418 struct cdrom_tochdr toc;
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419 struct cdrom_subchnl info;
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420
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421 info.cdsc_format = CDROM_MSF;
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422 if ( ioctl(cdrom->id, CDROMSUBCHNL, &info) < 0 ) {
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423 if ( ERRNO_TRAYEMPTY(errno) ) {
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424 status = CD_TRAYEMPTY;
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425 } else {
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426 status = CD_ERROR;
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427 }
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428 } else {
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429 switch (info.cdsc_audiostatus) {
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430 case CDROM_AUDIO_INVALID:
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431 case CDROM_AUDIO_NO_STATUS:
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432 /* Try to determine if there's a CD available */
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433 if (ioctl(cdrom->id, CDROMREADTOCHDR, &toc)==0)
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434 status = CD_STOPPED;
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435 else
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436 status = CD_TRAYEMPTY;
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437 break;
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438 case CDROM_AUDIO_COMPLETED:
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439 status = CD_STOPPED;
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440 break;
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441 case CDROM_AUDIO_PLAY:
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442 status = CD_PLAYING;
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443 break;
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|
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444 case CDROM_AUDIO_PAUSED:
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|
|
445 /* Workaround buggy CD-ROM drive */
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|
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446 if ( info.cdsc_trk == CDROM_LEADOUT ) {
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|
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447 status = CD_STOPPED;
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|
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448 } else {
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|
|
449 status = CD_PAUSED;
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|
|
450 }
|
|
|
451 break;
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|
|
452 default:
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|
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453 status = CD_ERROR;
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|
|
454 break;
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|
|
455 }
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|
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456 }
|
|
|
457 if ( position ) {
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|
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458 if ( status == CD_PLAYING || (status == CD_PAUSED) ) {
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|
|
459 *position = MSF_TO_FRAMES(
|
|
|
460 info.cdsc_absaddr.msf.minute,
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|
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461 info.cdsc_absaddr.msf.second,
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|
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462 info.cdsc_absaddr.msf.frame);
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|
|
463 } else {
|
|
|
464 *position = 0;
|
|
|
465 }
|
|
|
466 }
|
|
|
467 return(status);
|
|
|
468 }
|
|
|
469
|
|
|
470 /* Start play */
|
|
|
471 static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length)
|
|
|
472 {
|
|
|
473 struct cdrom_msf playtime;
|
|
|
474
|
|
|
475 FRAMES_TO_MSF(start,
|
|
|
476 &playtime.cdmsf_min0, &playtime.cdmsf_sec0, &playtime.cdmsf_frame0);
|
|
|
477 FRAMES_TO_MSF(start+length,
|
|
|
478 &playtime.cdmsf_min1, &playtime.cdmsf_sec1, &playtime.cdmsf_frame1);
|
|
|
479 #ifdef DEBUG_CDROM
|
|
|
480 fprintf(stderr, "Trying to play from %d:%d:%d to %d:%d:%d\n",
|
|
|
481 playtime.cdmsf_min0, playtime.cdmsf_sec0, playtime.cdmsf_frame0,
|
|
|
482 playtime.cdmsf_min1, playtime.cdmsf_sec1, playtime.cdmsf_frame1);
|
|
|
483 #endif
|
|
|
484 return(SDL_SYS_CDioctl(cdrom->id, CDROMPLAYMSF, &playtime));
|
|
|
485 }
|
|
|
486
|
|
|
487 /* Pause play */
|
|
|
488 static int SDL_SYS_CDPause(SDL_CD *cdrom)
|
|
|
489 {
|
|
|
490 return(SDL_SYS_CDioctl(cdrom->id, CDROMPAUSE, 0));
|
|
|
491 }
|
|
|
492
|
|
|
493 /* Resume play */
|
|
|
494 static int SDL_SYS_CDResume(SDL_CD *cdrom)
|
|
|
495 {
|
|
|
496 return(SDL_SYS_CDioctl(cdrom->id, CDROMRESUME, 0));
|
|
|
497 }
|
|
|
498
|
|
|
499 /* Stop play */
|
|
|
500 static int SDL_SYS_CDStop(SDL_CD *cdrom)
|
|
|
501 {
|
|
|
502 return(SDL_SYS_CDioctl(cdrom->id, CDROMSTOP, 0));
|
|
|
503 }
|
|
|
504
|
|
|
505 /* Eject the CD-ROM */
|
|
|
506 static int SDL_SYS_CDEject(SDL_CD *cdrom)
|
|
|
507 {
|
|
|
508 return(SDL_SYS_CDioctl(cdrom->id, CDROMEJECT, 0));
|
|
|
509 }
|
|
|
510
|
|
|
511 /* Close the CD-ROM handle */
|
|
|
512 static void SDL_SYS_CDClose(SDL_CD *cdrom)
|
|
|
513 {
|
|
|
514 close(cdrom->id);
|
|
|
515 }
|
|
|
516
|
|
|
517 void SDL_SYS_CDQuit(void)
|
|
|
518 {
|
|
|
519 int i;
|
|
|
520
|
|
|
521 if ( SDL_numcds > 0 ) {
|
|
|
522 for ( i=0; i<SDL_numcds; ++i ) {
|
|
|
523 free(SDL_cdlist[i]);
|
|
|
524 }
|
|
|
525 SDL_numcds = 0;
|
|
|
526 }
|
|
|
527 }
|
|
|
528
|
