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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 #include <sys/cdrom.h>
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40 #include <sys/dcmd_cam.h>
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41
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42
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43 #include "SDL_error.h"
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44 #include "SDL_cdrom.h"
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45 #include "SDL_syscdrom.h"
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46
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47
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48 /* The maximum number of CD-ROM drives we'll detect */
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49 #define MAX_DRIVES 16
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50
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51 /* A list of available CD-ROM drives */
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52 static char *SDL_cdlist[MAX_DRIVES];
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53 static dev_t SDL_cdmode[MAX_DRIVES];
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54
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55 /* The system-dependent CD control functions */
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56 static const char *SDL_SYS_CDName(int drive);
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57 static int SDL_SYS_CDOpen(int drive);
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58 static int SDL_SYS_CDGetTOC(SDL_CD *cdrom);
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59 static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position);
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60 static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length);
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61 static int SDL_SYS_CDPause(SDL_CD *cdrom);
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62 static int SDL_SYS_CDResume(SDL_CD *cdrom);
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63 static int SDL_SYS_CDStop(SDL_CD *cdrom);
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64 static int SDL_SYS_CDEject(SDL_CD *cdrom);
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65 static void SDL_SYS_CDClose(SDL_CD *cdrom);
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66
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67 /* Some ioctl() errno values which occur when the tray is empty */
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68 #define ERRNO_TRAYEMPTY(errno) \
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69 ((errno == EIO) || (errno == ENOENT) || (errno == EINVAL))
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70
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71 /* Check a drive to see if it is a CD-ROM */
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72 static int CheckDrive(char *drive, char *mnttype, struct stat *stbuf)
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73 {
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74 int is_cd, cdfd;
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75 cdrom_subch_data_t info;
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76
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77 /* If it doesn't exist, return -1 */
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78 if ( stat(drive, stbuf) < 0 ) {
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79 return(-1);
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80 }
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81
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82 /* If it does exist, verify that it's an available CD-ROM */
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83 is_cd = 0;
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84 if ( S_ISCHR(stbuf->st_mode) || S_ISBLK(stbuf->st_mode) ) {
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85 cdfd = open(drive, (O_RDONLY|O_EXCL|O_NONBLOCK), 0);
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86 if ( cdfd >= 0 ) {
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87 info.subch_command.data_format = CDROM_MSF;
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88 /* Under Linux, EIO occurs when a disk is not present.
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89 */
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90 if ((devctl(cdfd,DCMD_CAM_CDROMSUBCHNL,&info,sizeof(info),0) == 0) ||
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91 ERRNO_TRAYEMPTY(errno) )
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92 {
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93 is_cd = 1;
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94 }
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95 close(cdfd);
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96 }
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97 }
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98 return(is_cd);
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99 }
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100
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101 /* Add a CD-ROM drive to our list of valid drives */
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102 static void AddDrive(char *drive, struct stat *stbuf)
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103 {
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104 int i;
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105
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106 if ( SDL_numcds < MAX_DRIVES ) {
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107 /* Check to make sure it's not already in our list.
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108 This can happen when we see a drive via symbolic link.
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109 */
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110 for ( i=0; i<SDL_numcds; ++i ) {
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111 if ( stbuf->st_rdev == SDL_cdmode[i] ) {
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112 #ifdef DEBUG_CDROM
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113 fprintf(stderr, "Duplicate drive detected: %s == %s\n", drive, SDL_cdlist[i]);
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114 #endif
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115 return;
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116 }
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117 }
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118
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119 /* Add this drive to our list */
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120 i = SDL_numcds;
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121 SDL_cdlist[i] = (char *)malloc(strlen(drive)+1);
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122 if ( SDL_cdlist[i] == NULL ) {
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123 SDL_OutOfMemory();
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124 return;
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125 }
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126 strcpy(SDL_cdlist[i], drive);
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127 SDL_cdmode[i] = stbuf->st_rdev;
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128 ++SDL_numcds;
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129 #ifdef DEBUG_CDROM
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130 fprintf(stderr, "Added CD-ROM drive: %s\n", drive);
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131 #endif
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132 }
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133 }
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134
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135 int SDL_SYS_CDInit(void)
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136 {
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137 /* checklist: /dev/cdrom, /dev/hd?, /dev/scd? /dev/sr? */
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138 static char *checklist[] = {
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139 "cdrom", "?0 cd?", "?1 cd?", "?a hd?", "?0 scd?", "?0 sr?", NULL
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140 };
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141 char *SDLcdrom;
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142 int i, j, exists;
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143 char drive[32];
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144 struct stat stbuf;
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145
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146 /* Fill in our driver capabilities */
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147 SDL_CDcaps.Name = SDL_SYS_CDName;
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148 SDL_CDcaps.Open = SDL_SYS_CDOpen;
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149 SDL_CDcaps.GetTOC = SDL_SYS_CDGetTOC;
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150 SDL_CDcaps.Status = SDL_SYS_CDStatus;
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151 SDL_CDcaps.Play = SDL_SYS_CDPlay;
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152 SDL_CDcaps.Pause = SDL_SYS_CDPause;
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153 SDL_CDcaps.Resume = SDL_SYS_CDResume;
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154 SDL_CDcaps.Stop = SDL_SYS_CDStop;
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155 SDL_CDcaps.Eject = SDL_SYS_CDEject;
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156 SDL_CDcaps.Close = SDL_SYS_CDClose;
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157
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158 /* Look in the environment for our CD-ROM drive list */
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159 SDLcdrom = getenv("SDL_CDROM"); /* ':' separated list of devices */
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160 if ( SDLcdrom != NULL ) {
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161 char *cdpath, *delim;
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162 cdpath = malloc(strlen(SDLcdrom)+1);
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163 if ( cdpath != NULL ) {
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164 strcpy(cdpath, SDLcdrom);
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165 SDLcdrom = cdpath;
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166 do {
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167 delim = strchr(SDLcdrom, ':');
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168 if ( delim ) {
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169 *delim++ = '\0';
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170 }
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171 #ifdef DEBUG_CDROM
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172 fprintf(stderr, "Checking CD-ROM drive from SDL_CDROM: %s\n", SDLcdrom);
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173 #endif
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174 if ( CheckDrive(SDLcdrom, NULL, &stbuf) > 0 ) {
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175 AddDrive(SDLcdrom, &stbuf);
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176 }
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177 if ( delim ) {
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178 SDLcdrom = delim;
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179 } else {
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180 SDLcdrom = NULL;
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181 }
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182 } while ( SDLcdrom );
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183 free(cdpath);
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184 }
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185
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186 /* If we found our drives, there's nothing left to do */
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187 if ( SDL_numcds > 0 ) {
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188 return(0);
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189 }
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190 }
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191
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192 /* Scan the system for CD-ROM drives */
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193 for ( i=0; checklist[i]; ++i ) {
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194 if ( checklist[i][0] == '?' ) {
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195 char *insert;
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196 exists = 1;
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197 for ( j=checklist[i][1]; exists; ++j ) {
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198 sprintf(drive, "/dev/%s", &checklist[i][3]);
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199 insert = strchr(drive, '?');
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200 if ( insert != NULL ) {
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201 *insert = j;
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202 }
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203 #ifdef DEBUG_CDROM
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204 fprintf(stderr, "Checking possible CD-ROM drive: %s\n", drive);
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205 #endif
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206 switch (CheckDrive(drive, NULL, &stbuf)) {
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207 /* Drive exists and is a CD-ROM */
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208 case 1:
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209 AddDrive(drive, &stbuf);
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210 break;
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211 /* Drive exists, but isn't a CD-ROM */
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212 case 0:
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213 break;
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214 /* Drive doesn't exist */
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215 case -1:
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216 exists = 0;
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217 break;
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218 }
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219 }
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220 } else {
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221 sprintf(drive, "/dev/%s", checklist[i]);
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222 #ifdef DEBUG_CDROM
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223 fprintf(stderr, "Checking possible CD-ROM drive: %s\n", drive);
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224 #endif
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225 if ( CheckDrive(drive, NULL, &stbuf) > 0 ) {
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226 AddDrive(drive, &stbuf);
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227 }
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228 }
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229 }
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230 return(0);
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231 }
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232
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233 static const char *SDL_SYS_CDName(int drive)
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234 {
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235 return(SDL_cdlist[drive]);
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236 }
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237
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238 static int SDL_SYS_CDOpen(int drive)
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239 {
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240 return(open(SDL_cdlist[drive], (O_RDONLY|O_EXCL|O_NONBLOCK), 0));
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241 }
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242
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243 static int SDL_SYS_CDGetTOC(SDL_CD *cdrom)
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244 {
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245 cdrom_read_toc_t toc;
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246 int i, okay;
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247
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248 okay = 0;
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249 if (devctl(cdrom->id, DCMD_CAM_CDROMREADTOC, &toc, sizeof(toc), 0) == 0) {
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250 cdrom->numtracks = toc.last_track - toc.first_track + 1;
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251 if ( cdrom->numtracks > SDL_MAX_TRACKS ) {
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252 cdrom->numtracks = SDL_MAX_TRACKS;
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253 }
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254 /* Read all the track TOC entries */
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255 for ( i=0; i<=cdrom->numtracks; ++i ) {
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256 if ( i == cdrom->numtracks ) {
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257 cdrom->track[i].id = CDROM_LEADOUT;
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258 } else {
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259 #if 0 /* Sam 11/6/00 - an obsolete field? */
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260 cdrom->track[i].id = toc.cdth_trk0+i;
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261 #else
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262 cdrom->track[i].id = toc.first_track+i;
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263 #endif
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264 }
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265 cdrom->track[i].type = toc.toc_entry[i].control_adr;
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266 cdrom->track[i].offset = MSF_TO_FRAMES(
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267 toc.toc_entry[i].addr.msf.minute,
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268 toc.toc_entry[i].addr.msf.second,
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269 toc.toc_entry[i].addr.msf.frame);
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270 cdrom->track[i].length = 0;
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271 if ( i > 0 ) {
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272 cdrom->track[i-1].length =
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273 cdrom->track[i].offset-
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274 cdrom->track[i-1].offset;
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275 }
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276 }
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277 if ( i == (cdrom->numtracks+1) ) {
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278 okay = 1;
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279 }
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280 }
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281 return(okay ? 0 : -1);
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282 }
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283
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284 /* Get CD-ROM status */
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285 static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position)
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286 {
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287 CDstatus status;
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288 cdrom_read_toc_t toc;
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289 subch_current_position_t info;
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290
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291 #if 0 /* Sam 11/6/00 - an obsolete field? */
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292 info.subch_command.data_format = CDROM_SUBCH_CURRENT_POSITION;
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293 info.subch_command.track_number = 0;
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294 #else
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295 info.data_format = CDROM_SUBCH_CURRENT_POSITION;
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296 info.track_number = 0;
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297 #endif
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298 if (devctl(cdrom->id, DCMD_CAM_CDROMSUBCHNL, &info, sizeof(info), 0) != 0) {
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299 if ( ERRNO_TRAYEMPTY(errno) ) {
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300 status = CD_TRAYEMPTY;
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301 } else {
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302 status = CD_ERROR;
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303 }
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304 } else {
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305 switch (info.header.audio_status) {
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306 case CDROM_AUDIO_INVALID:
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307 case CDROM_AUDIO_NO_STATUS:
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308 /* Try to determine if there's a CD available */
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309 if (devctl(cdrom->id, DCMD_CAM_CDROMREADTOC, &toc, sizeof(toc), 0)==0)
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310 status = CD_STOPPED;
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311 else
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312 status = CD_TRAYEMPTY;
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313 break;
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314 case CDROM_AUDIO_COMPLETED:
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315 status = CD_STOPPED;
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316 break;
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317 case CDROM_AUDIO_PLAY:
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318 status = CD_PLAYING;
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319 break;
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320 case CDROM_AUDIO_PAUSED:
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321 /* Workaround buggy CD-ROM drive */
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322 if ( info.data_format == CDROM_LEADOUT ) {
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323 status = CD_STOPPED;
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324 } else {
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325 status = CD_PAUSED;
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326 }
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327 break;
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328 default:
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329 status = CD_ERROR;
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330 break;
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331 }
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332 }
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333 if ( position ) {
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334 if ( status == CD_PLAYING || (status == CD_PAUSED) ) {
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335 *position = MSF_TO_FRAMES(
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336 info.addr.msf.minute,
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337 info.addr.msf.second,
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338 info.addr.msf.frame);
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339 } else {
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340 *position = 0;
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341 }
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342 }
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343 return(status);
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344 }
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345
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346 /* Start play */
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347 static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length)
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348 {
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349 cdrom_playmsf_t playtime;
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350
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351 FRAMES_TO_MSF(start,
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352 &playtime.start_minute, &playtime.start_second, &playtime.start_frame);
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353 FRAMES_TO_MSF(start+length,
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354 &playtime.end_minute, &playtime.end_second, &playtime.end_frame);
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355 #ifdef DEBUG_CDROM
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356 fprintf(stderr, "Trying to play from %d:%d:%d to %d:%d:%d\n",
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357 playtime.start_minute, playtime.start_second, playtime.start_frame,
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358 playtime.end_minute, playtime.end_second, playtime.end_frame);
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359 #endif
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360 return(devctl(cdrom->id, DCMD_CAM_CDROMPLAYMSF, &playtime, sizeof(playtime), 0));
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361 }
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362
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363 /* Pause play */
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364 static int SDL_SYS_CDPause(SDL_CD *cdrom)
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365 {
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366 return(devctl(cdrom->id, DCMD_CAM_CDROMPAUSE, NULL, 0, 0));
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367 }
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368
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369 /* Resume play */
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370 static int SDL_SYS_CDResume(SDL_CD *cdrom)
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371 {
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372 return(devctl(cdrom->id, DCMD_CAM_CDROMRESUME, NULL, 0, 0));
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373 }
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374
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375 /* Stop play */
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376 static int SDL_SYS_CDStop(SDL_CD *cdrom)
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377 {
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378 return(devctl(cdrom->id, DCMD_CAM_CDROMSTOP, NULL, 0, 0));
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379 }
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380
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381 /* Eject the CD-ROM */
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382 static int SDL_SYS_CDEject(SDL_CD *cdrom)
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383 {
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384 return(devctl(cdrom->id, DCMD_CAM_EJECT_MEDIA, NULL, 0, 0));
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385 }
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386
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387 /* Close the CD-ROM handle */
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388 static void SDL_SYS_CDClose(SDL_CD *cdrom)
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389 {
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390 close(cdrom->id);
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391 }
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392
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393 void SDL_SYS_CDQuit(void)
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394 {
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395 int i;
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396
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397 if ( SDL_numcds > 0 ) {
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398 for ( i=0; i<SDL_numcds; ++i ) {
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399 free(SDL_cdlist[i]);
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400 }
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401 SDL_numcds = 0;
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402 }
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403 }
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404
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