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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 <sys/ioctl.h>
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32 #include <stdlib.h>
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33 #include <sys/stat.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 #include <sys/cdio.h>
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40
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41 #include "SDL_error.h"
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42 #include "SDL_cdrom.h"
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43 #include "SDL_syscdrom.h"
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44
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45
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46 /* The maximum number of CD-ROM drives we'll detect */
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47 #define MAX_DRIVES 16
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48
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49 /* A list of available CD-ROM drives */
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50 static char *SDL_cdlist[MAX_DRIVES];
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51 static dev_t SDL_cdmode[MAX_DRIVES];
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52
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53 /* The system-dependent CD control functions */
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54 static const char *SDL_SYS_CDName(int drive);
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55 static int SDL_SYS_CDOpen(int drive);
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56 static int SDL_SYS_CDGetTOC(SDL_CD *cdrom);
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57 static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position);
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58 static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length);
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59 static int SDL_SYS_CDPause(SDL_CD *cdrom);
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60 static int SDL_SYS_CDResume(SDL_CD *cdrom);
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61 static int SDL_SYS_CDStop(SDL_CD *cdrom);
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62 static int SDL_SYS_CDEject(SDL_CD *cdrom);
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63 static void SDL_SYS_CDClose(SDL_CD *cdrom);
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64
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65 /* Some ioctl() errno values which occur when the tray is empty */
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66 #define ERRNO_TRAYEMPTY(errno) \
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67 ((errno == EIO) || (errno == ENOENT) || (errno == EINVAL))
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68
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69 /* Check a drive to see if it is a CD-ROM */
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70 static int CheckDrive(char *drive, struct stat *stbuf)
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71 {
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72 int is_cd, cdfd;
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73 struct ioc_read_subchannel info;
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74
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75 /* If it doesn't exist, return -1 */
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76 if ( stat(drive, stbuf) < 0 ) {
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77 return(-1);
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78 }
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79
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80 /* If it does exist, verify that it's an available CD-ROM */
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81 is_cd = 0;
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82 if ( S_ISCHR(stbuf->st_mode) || S_ISBLK(stbuf->st_mode) ) {
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83 cdfd = open(drive, (O_RDONLY|O_EXCL|O_NONBLOCK), 0);
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84 if ( cdfd >= 0 ) {
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85 info.address_format = CD_MSF_FORMAT;
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86 info.data_format = CD_CURRENT_POSITION;
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87 info.data_len = 0;
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88 info.data = NULL;
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89 /* Under Linux, EIO occurs when a disk is not present.
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90 This isn't 100% reliable, so we use the USE_MNTENT
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91 code above instead.
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92 */
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93 if ( (ioctl(cdfd, CDIOCREADSUBCHANNEL, &info) == 0) ||
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94 ERRNO_TRAYEMPTY(errno) ) {
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95 is_cd = 1;
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96 }
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97 close(cdfd);
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98 }
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99 }
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100 return(is_cd);
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101 }
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102
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103 /* Add a CD-ROM drive to our list of valid drives */
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104 static void AddDrive(char *drive, struct stat *stbuf)
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105 {
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106 int i;
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107
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108 if ( SDL_numcds < MAX_DRIVES ) {
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109 /* Check to make sure it's not already in our list.
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110 This can happen when we see a drive via symbolic link.
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111 */
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112 for ( i=0; i<SDL_numcds; ++i ) {
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113 if ( stbuf->st_rdev == SDL_cdmode[i] ) {
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114 #ifdef DEBUG_CDROM
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115 fprintf(stderr, "Duplicate drive detected: %s == %s\n", drive, SDL_cdlist[i]);
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116 #endif
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117 return;
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118 }
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119 }
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120
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121 /* Add this drive to our list */
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122 i = SDL_numcds;
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123 SDL_cdlist[i] = (char *)malloc(strlen(drive)+1);
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124 if ( SDL_cdlist[i] == NULL ) {
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125 SDL_OutOfMemory();
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126 return;
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127 }
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128 strcpy(SDL_cdlist[i], drive);
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129 SDL_cdmode[i] = stbuf->st_rdev;
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130 ++SDL_numcds;
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131 #ifdef DEBUG_CDROM
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132 fprintf(stderr, "Added CD-ROM drive: %s\n", drive);
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133 #endif
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134 }
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135 }
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136
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137 int SDL_SYS_CDInit(void)
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138 {
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139 static char *checklist[] = {
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140 "?0 cd?c", "?0 acd?c", "cdrom", NULL
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141 };
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142 char *SDLcdrom;
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143 int i, j, exists;
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144 char drive[32];
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145 struct stat stbuf;
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146
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147 /* Fill in our driver capabilities */
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148 SDL_CDcaps.Name = SDL_SYS_CDName;
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149 SDL_CDcaps.Open = SDL_SYS_CDOpen;
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150 SDL_CDcaps.GetTOC = SDL_SYS_CDGetTOC;
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151 SDL_CDcaps.Status = SDL_SYS_CDStatus;
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152 SDL_CDcaps.Play = SDL_SYS_CDPlay;
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153 SDL_CDcaps.Pause = SDL_SYS_CDPause;
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154 SDL_CDcaps.Resume = SDL_SYS_CDResume;
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155 SDL_CDcaps.Stop = SDL_SYS_CDStop;
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156 SDL_CDcaps.Eject = SDL_SYS_CDEject;
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157 SDL_CDcaps.Close = SDL_SYS_CDClose;
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158
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159 /* Look in the environment for our CD-ROM drive list */
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160 SDLcdrom = getenv("SDL_CDROM"); /* ':' separated list of devices */
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161 if ( SDLcdrom != NULL ) {
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162 char *cdpath, *delim;
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163 cdpath = malloc(strlen(SDLcdrom)+1);
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164 if ( cdpath != NULL ) {
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165 strcpy(cdpath, SDLcdrom);
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166 SDLcdrom = cdpath;
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167 do {
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168 delim = strchr(SDLcdrom, ':');
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169 if ( delim ) {
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170 *delim++ = '\0';
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171 }
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172 if ( CheckDrive(SDLcdrom, &stbuf) > 0 ) {
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173 AddDrive(SDLcdrom, &stbuf);
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174 }
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175 if ( delim ) {
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176 SDLcdrom = delim;
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177 } else {
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178 SDLcdrom = NULL;
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179 }
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180 } while ( SDLcdrom );
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181 free(cdpath);
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182 }
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183
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184 /* If we found our drives, there's nothing left to do */
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185 if ( SDL_numcds > 0 ) {
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186 return(0);
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187 }
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188 }
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189
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190 /* Scan the system for CD-ROM drives */
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191 for ( i=0; checklist[i]; ++i ) {
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192 if ( checklist[i][0] == '?' ) {
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193 char *insert;
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194 exists = 1;
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195 for ( j=checklist[i][1]; exists; ++j ) {
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196 sprintf(drive, "/dev/%s", &checklist[i][3]);
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197 insert = strchr(drive, '?');
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198 if ( insert != NULL ) {
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199 *insert = j;
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200 }
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201 switch (CheckDrive(drive, &stbuf)) {
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202 /* Drive exists and is a CD-ROM */
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203 case 1:
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204 AddDrive(drive, &stbuf);
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205 break;
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206 /* Drive exists, but isn't a CD-ROM */
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207 case 0:
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208 break;
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209 /* Drive doesn't exist */
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210 case -1:
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211 exists = 0;
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212 break;
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213 }
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214 }
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215 } else {
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216 sprintf(drive, "/dev/%s", checklist[i]);
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217 if ( CheckDrive(drive, &stbuf) > 0 ) {
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218 AddDrive(drive, &stbuf);
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219 }
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220 }
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221 }
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222 return(0);
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223 }
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224
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225 /* General ioctl() CD-ROM command function */
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226 static int SDL_SYS_CDioctl(int id, int command, void *arg)
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227 {
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228 int retval;
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229
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230 retval = ioctl(id, command, arg);
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231 if ( retval < 0 ) {
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232 SDL_SetError("ioctl() error: %s", strerror(errno));
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233 }
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234 return(retval);
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235 }
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236
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237 static const char *SDL_SYS_CDName(int drive)
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238 {
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239 return(SDL_cdlist[drive]);
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240 }
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241
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242 static int SDL_SYS_CDOpen(int drive)
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243 {
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244 return(open(SDL_cdlist[drive], (O_RDONLY|O_EXCL|O_NONBLOCK), 0));
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245 }
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246
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247 static int SDL_SYS_CDGetTOC(SDL_CD *cdrom)
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248 {
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249 struct ioc_toc_header toc;
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250 int i, okay;
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251 struct ioc_read_toc_entry entry;
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252 struct cd_toc_entry data;
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253
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254 okay = 0;
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255 if ( SDL_SYS_CDioctl(cdrom->id, CDIOREADTOCHEADER, &toc) == 0 ) {
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256 cdrom->numtracks = toc.ending_track-toc.starting_track+1;
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257 if ( cdrom->numtracks > SDL_MAX_TRACKS ) {
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258 cdrom->numtracks = SDL_MAX_TRACKS;
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259 }
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260 /* Read all the track TOC entries */
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261 for ( i=0; i<=cdrom->numtracks; ++i ) {
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262 if ( i == cdrom->numtracks ) {
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263 cdrom->track[i].id = 0xAA; /* CDROM_LEADOUT */
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264 } else {
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265 cdrom->track[i].id = toc.starting_track+i;
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266 }
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267 entry.starting_track = cdrom->track[i].id;
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268 entry.address_format = CD_MSF_FORMAT;
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269 entry.data_len = sizeof(data);
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270 entry.data = &data;
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271 if ( SDL_SYS_CDioctl(cdrom->id, CDIOREADTOCENTRYS,
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272 &entry) < 0 ) {
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273 break;
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274 } else {
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275 cdrom->track[i].type = data.control;
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276 cdrom->track[i].offset = MSF_TO_FRAMES(
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277 data.addr.msf.minute,
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278 data.addr.msf.second,
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279 data.addr.msf.frame);
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280 cdrom->track[i].length = 0;
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281 if ( i > 0 ) {
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282 cdrom->track[i-1].length =
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283 cdrom->track[i].offset-
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284 cdrom->track[i-1].offset;
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285 }
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286 }
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287 }
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288 if ( i == (cdrom->numtracks+1) ) {
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289 okay = 1;
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290 }
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291 }
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292 return(okay ? 0 : -1);
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293 }
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294
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295 /* Get CD-ROM status */
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296 static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position)
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297 {
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298 CDstatus status;
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299 struct ioc_toc_header toc;
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300 struct ioc_read_subchannel info;
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301 struct cd_sub_channel_info data;
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302
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303 info.address_format = CD_MSF_FORMAT;
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304 info.data_format = CD_CURRENT_POSITION;
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305 info.track = 0;
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306 info.data_len = sizeof(data);
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307 info.data = &data;
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308 if ( ioctl(cdrom->id, CDIOCREADSUBCHANNEL, &info) < 0 ) {
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309 if ( ERRNO_TRAYEMPTY(errno) ) {
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310 status = CD_TRAYEMPTY;
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311 } else {
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312 status = CD_ERROR;
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313 }
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314 } else {
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315 switch (data.header.audio_status) {
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316 case CD_AS_AUDIO_INVALID:
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317 case CD_AS_NO_STATUS:
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318 /* Try to determine if there's a CD available */
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319 if (ioctl(cdrom->id,CDIOREADTOCHEADER,&toc)==0)
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320 status = CD_STOPPED;
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321 else
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322 status = CD_TRAYEMPTY;
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323 break;
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324 case CD_AS_PLAY_COMPLETED:
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325 status = CD_STOPPED;
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326 break;
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327 case CD_AS_PLAY_IN_PROGRESS:
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328 status = CD_PLAYING;
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329 break;
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330 case CD_AS_PLAY_PAUSED:
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331 status = CD_PAUSED;
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332 break;
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333 default:
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334 status = CD_ERROR;
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335 break;
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336 }
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337 }
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338 if ( position ) {
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339 if ( status == CD_PLAYING || (status == CD_PAUSED) ) {
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340 *position = MSF_TO_FRAMES(
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341 data.what.position.absaddr.msf.minute,
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342 data.what.position.absaddr.msf.second,
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343 data.what.position.absaddr.msf.frame);
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344 } else {
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345 *position = 0;
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346 }
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347 }
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348 return(status);
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349 }
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350
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351 /* Start play */
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352 static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length)
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353 {
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354 struct ioc_play_msf playtime;
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355
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356 FRAMES_TO_MSF(start,
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357 &playtime.start_m, &playtime.start_s, &playtime.start_f);
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358 FRAMES_TO_MSF(start+length,
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359 &playtime.end_m, &playtime.end_s, &playtime.end_f);
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360 #ifdef DEBUG_CDROM
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361 fprintf(stderr, "Trying to play from %d:%d:%d to %d:%d:%d\n",
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362 playtime.start_m, playtime.start_s, playtime.start_f,
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363 playtime.end_m, playtime.end_s, playtime.end_f);
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364 #endif
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365 ioctl(cdrom->id, CDIOCSTART, 0);
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366 return(SDL_SYS_CDioctl(cdrom->id, CDIOCPLAYMSF, &playtime));
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367 }
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368
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369 /* Pause play */
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370 static int SDL_SYS_CDPause(SDL_CD *cdrom)
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371 {
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372 return(SDL_SYS_CDioctl(cdrom->id, CDIOCPAUSE, 0));
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373 }
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374
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375 /* Resume play */
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376 static int SDL_SYS_CDResume(SDL_CD *cdrom)
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377 {
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378 return(SDL_SYS_CDioctl(cdrom->id, CDIOCRESUME, 0));
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379 }
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380
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381 /* Stop play */
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382 static int SDL_SYS_CDStop(SDL_CD *cdrom)
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383 {
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384 return(SDL_SYS_CDioctl(cdrom->id, CDIOCSTOP, 0));
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385 }
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386
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387 /* Eject the CD-ROM */
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388 static int SDL_SYS_CDEject(SDL_CD *cdrom)
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389 {
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390 return(SDL_SYS_CDioctl(cdrom->id, CDIOCEJECT, 0));
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391 }
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392
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393 /* Close the CD-ROM handle */
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394 static void SDL_SYS_CDClose(SDL_CD *cdrom)
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395 {
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396 close(cdrom->id);
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397 }
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398
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399 void SDL_SYS_CDQuit(void)
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400 {
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401 int i;
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402
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403 if ( SDL_numcds > 0 ) {
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404 for ( i=0; i<SDL_numcds; ++i ) {
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405 free(SDL_cdlist[i]);
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406 }
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407 SDL_numcds = 0;
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408 }
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409 }
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410
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