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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 <fcntl.h>
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34 #include <stdio.h>
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35 #include <string.h>
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36 #include <errno.h>
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37 #include <unistd.h>
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38 #include <sys/cdio.h>
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39
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40 #include "SDL_error.h"
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41 #include "SDL_cdrom.h"
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42 #include "SDL_syscdrom.h"
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43
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44
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45 /* The maximum number of CD-ROM drives we'll detect */
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46 #define MAX_DRIVES 16
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47
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48 /* A list of available CD-ROM drives */
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49 static char *SDL_cdlist[MAX_DRIVES];
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50 static dev_t SDL_cdmode[MAX_DRIVES];
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51
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52 /* The system-dependent CD control functions */
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53 static const char *SDL_SYS_CDName(int drive);
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54 static int SDL_SYS_CDOpen(int drive);
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55 static int SDL_SYS_CDGetTOC(SDL_CD *cdrom);
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56 static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position);
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57 static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length);
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58 static int SDL_SYS_CDPause(SDL_CD *cdrom);
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59 static int SDL_SYS_CDResume(SDL_CD *cdrom);
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60 static int SDL_SYS_CDStop(SDL_CD *cdrom);
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61 static int SDL_SYS_CDEject(SDL_CD *cdrom);
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62 static void SDL_SYS_CDClose(SDL_CD *cdrom);
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63
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64 /* Some ioctl() errno values which occur when the tray is empty */
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65 #define ERRNO_TRAYEMPTY(errno) \
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66 ((errno == EIO) || (errno == ENOENT) || (errno == EINVAL))
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67
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68 /* Check a drive to see if it is a CD-ROM */
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69 static int CheckDrive(char *drive, struct stat *stbuf)
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70 {
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71 int is_cd, cdfd;
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72 struct ioc_read_subchannel info;
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73
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74 /* If it doesn't exist, return -1 */
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75 if ( stat(drive, stbuf) < 0 ) {
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76 return(-1);
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77 }
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78
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79 /* If it does exist, verify that it's an available CD-ROM */
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80 is_cd = 0;
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81 if ( S_ISCHR(stbuf->st_mode) || S_ISBLK(stbuf->st_mode) ) {
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82 cdfd = open(drive, (O_RDONLY|O_EXCL|O_NONBLOCK), 0);
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83 if ( cdfd >= 0 ) {
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84 info.address_format = CD_MSF_FORMAT;
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85 info.data_format = CD_CURRENT_POSITION;
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86 info.data_len = 0;
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87 info.data = NULL;
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88 /* Under Linux, EIO occurs when a disk is not present.
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89 This isn't 100% reliable, so we use the USE_MNTENT
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90 code above instead.
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91 */
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92 if ( (ioctl(cdfd, CDIOCREADSUBCHANNEL, &info) == 0) ||
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93 ERRNO_TRAYEMPTY(errno) ) {
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94 is_cd = 1;
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95 }
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96 close(cdfd);
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97 }
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98 }
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99 return(is_cd);
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100 }
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101
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102 /* Add a CD-ROM drive to our list of valid drives */
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103 static void AddDrive(char *drive, struct stat *stbuf)
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104 {
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105 int i;
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106
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107 if ( SDL_numcds < MAX_DRIVES ) {
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108 /* Check to make sure it's not already in our list.
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109 This can happen when we see a drive via symbolic link.
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110 */
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111 for ( i=0; i<SDL_numcds; ++i ) {
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112 if ( stbuf->st_rdev == SDL_cdmode[i] ) {
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113 #ifdef DEBUG_CDROM
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114 fprintf(stderr, "Duplicate drive detected: %s == %s\n", drive, SDL_cdlist[i]);
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115 #endif
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116 return;
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117 }
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118 }
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119
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120 /* Add this drive to our list */
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121 i = SDL_numcds;
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122 SDL_cdlist[i] = (char *)malloc(strlen(drive)+1);
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123 if ( SDL_cdlist[i] == NULL ) {
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124 SDL_OutOfMemory();
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125 return;
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126 }
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127 strcpy(SDL_cdlist[i], drive);
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128 SDL_cdmode[i] = stbuf->st_rdev;
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129 ++SDL_numcds;
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130 #ifdef DEBUG_CDROM
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131 fprintf(stderr, "Added CD-ROM drive: %s\n", drive);
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132 #endif
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133 }
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134 }
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135
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136 int SDL_SYS_CDInit(void)
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137 {
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138 /* checklist: /dev/cdrom,/dev/cd?c /dev/acd?c
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139 /dev/matcd?c /dev/mcd?c /dev/scd?c */
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140 static char *checklist[] = {
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141 "cdrom", "?0 cd?", "?0 acd?", "?0 matcd?", "?0 mcd?", "?0 scd?",NULL
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142 };
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143 char *SDLcdrom;
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144 int i, j, exists;
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145 char drive[32];
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146 struct stat stbuf;
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147
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148 /* Fill in our driver capabilities */
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149 SDL_CDcaps.Name = SDL_SYS_CDName;
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150 SDL_CDcaps.Open = SDL_SYS_CDOpen;
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151 SDL_CDcaps.GetTOC = SDL_SYS_CDGetTOC;
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152 SDL_CDcaps.Status = SDL_SYS_CDStatus;
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153 SDL_CDcaps.Play = SDL_SYS_CDPlay;
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154 SDL_CDcaps.Pause = SDL_SYS_CDPause;
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155 SDL_CDcaps.Resume = SDL_SYS_CDResume;
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156 SDL_CDcaps.Stop = SDL_SYS_CDStop;
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157 SDL_CDcaps.Eject = SDL_SYS_CDEject;
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158 SDL_CDcaps.Close = SDL_SYS_CDClose;
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159
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160 /* Look in the environment for our CD-ROM drive list */
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161 SDLcdrom = getenv("SDL_CDROM"); /* ':' separated list of devices */
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162 if ( SDLcdrom != NULL ) {
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163 char *cdpath, *delim;
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164 cdpath = malloc(strlen(SDLcdrom)+1);
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165 if ( cdpath != NULL ) {
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166 strcpy(cdpath, SDLcdrom);
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167 SDLcdrom = cdpath;
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168 do {
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169 delim = strchr(SDLcdrom, ':');
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170 if ( delim ) {
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171 *delim++ = '\0';
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172 }
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173 if ( CheckDrive(SDLcdrom, &stbuf) > 0 ) {
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174 AddDrive(SDLcdrom, &stbuf);
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175 }
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176 if ( delim ) {
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177 SDLcdrom = delim;
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178 } else {
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179 SDLcdrom = NULL;
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180 }
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181 } while ( SDLcdrom );
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182 free(cdpath);
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183 }
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184
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185 /* If we found our drives, there's nothing left to do */
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186 if ( SDL_numcds > 0 ) {
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187 return(0);
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188 }
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189 }
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190
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191 /* Scan the system for CD-ROM drives */
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192 for ( i=0; checklist[i]; ++i ) {
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193 if ( checklist[i][0] == '?' ) {
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194 char *insert;
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195 exists = 1;
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196 for ( j=checklist[i][1]; exists; ++j ) {
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197 sprintf(drive, "/dev/%sc", &checklist[i][3]);
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198 insert = strchr(drive, '?');
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199 if ( insert != NULL ) {
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200 *insert = j;
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201 }
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202 switch (CheckDrive(drive, &stbuf)) {
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203 /* Drive exists and is a CD-ROM */
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204 case 1:
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205 AddDrive(drive, &stbuf);
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206 break;
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207 /* Drive exists, but isn't a CD-ROM */
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208 case 0:
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209 break;
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210 /* Drive doesn't exist */
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211 case -1:
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212 exists = 0;
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213 break;
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214 }
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215 }
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216 } else {
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217 sprintf(drive, "/dev/%s", checklist[i]);
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218 if ( CheckDrive(drive, &stbuf) > 0 ) {
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219 AddDrive(drive, &stbuf);
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220 }
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221 }
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222 }
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223 return(0);
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224 }
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225
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226 /* General ioctl() CD-ROM command function */
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227 static int SDL_SYS_CDioctl(int id, int command, void *arg)
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228 {
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229 int retval;
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230
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231 retval = ioctl(id, command, arg);
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232 if ( retval < 0 ) {
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233 SDL_SetError("ioctl() error: %s", strerror(errno));
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234 }
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235 return(retval);
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236 }
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237
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238 static const char *SDL_SYS_CDName(int drive)
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239 {
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240 return(SDL_cdlist[drive]);
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241 }
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242
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243 static int SDL_SYS_CDOpen(int drive)
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244 {
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245 return(open(SDL_cdlist[drive], (O_RDONLY|O_EXCL|O_NONBLOCK), 0));
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246 }
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247
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248 static int SDL_SYS_CDGetTOC(SDL_CD *cdrom)
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249 {
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250 struct ioc_toc_header toc;
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251 int i, okay;
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252 struct ioc_read_toc_entry entry;
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253 struct cd_toc_entry data;
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254
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255 okay = 0;
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256 if ( SDL_SYS_CDioctl(cdrom->id, CDIOREADTOCHEADER, &toc) == 0 ) {
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257 cdrom->numtracks = toc.ending_track-toc.starting_track+1;
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258 if ( cdrom->numtracks > SDL_MAX_TRACKS ) {
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259 cdrom->numtracks = SDL_MAX_TRACKS;
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260 }
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261 /* Read all the track TOC entries */
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262 for ( i=0; i<=cdrom->numtracks; ++i ) {
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263 if ( i == cdrom->numtracks ) {
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264 cdrom->track[i].id = 0xAA; /* CDROM_LEADOUT */
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265 } else {
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266 cdrom->track[i].id = toc.starting_track+i;
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267 }
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268 entry.starting_track = cdrom->track[i].id;
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269 entry.address_format = CD_MSF_FORMAT;
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270 entry.data_len = sizeof(data);
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271 entry.data = &data;
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272 if ( SDL_SYS_CDioctl(cdrom->id, CDIOREADTOCENTRYS,
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273 &entry) < 0 ) {
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274 break;
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275 } else {
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276 cdrom->track[i].type = data.control;
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277 cdrom->track[i].offset = MSF_TO_FRAMES(
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278 data.addr.msf.minute,
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279 data.addr.msf.second,
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280 data.addr.msf.frame);
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281 cdrom->track[i].length = 0;
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282 if ( i > 0 ) {
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283 cdrom->track[i-1].length =
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284 cdrom->track[i].offset-
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285 cdrom->track[i-1].offset;
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286 }
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287 }
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288 }
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289 if ( i == (cdrom->numtracks+1) ) {
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290 okay = 1;
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291 }
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292 }
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293 return(okay ? 0 : -1);
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294 }
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295
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296 /* Get CD-ROM status */
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297 static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position)
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298 {
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299 CDstatus status;
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300 struct ioc_toc_header toc;
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301 struct ioc_read_subchannel info;
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302 struct cd_sub_channel_info data;
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303
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304 info.address_format = CD_MSF_FORMAT;
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305 info.data_format = CD_CURRENT_POSITION;
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306 info.track = 0;
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307 info.data_len = sizeof(data);
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308 info.data = &data;
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309 if ( ioctl(cdrom->id, CDIOCREADSUBCHANNEL, &info) < 0 ) {
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310 if ( ERRNO_TRAYEMPTY(errno) ) {
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311 status = CD_TRAYEMPTY;
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312 } else {
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313 status = CD_ERROR;
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314 }
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315 } else {
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316 switch (data.header.audio_status) {
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317 case CD_AS_AUDIO_INVALID:
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318 case CD_AS_NO_STATUS:
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319 /* Try to determine if there's a CD available */
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320 if (ioctl(cdrom->id,CDIOREADTOCHEADER,&toc)==0)
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321 status = CD_STOPPED;
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322 else
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323 status = CD_TRAYEMPTY;
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324 break;
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325 case CD_AS_PLAY_COMPLETED:
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326 status = CD_STOPPED;
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327 break;
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328 case CD_AS_PLAY_IN_PROGRESS:
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329 status = CD_PLAYING;
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330 break;
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331 case CD_AS_PLAY_PAUSED:
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332 status = CD_PAUSED;
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333 break;
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334 default:
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335 status = CD_ERROR;
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336 break;
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337 }
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338 }
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339 if ( position ) {
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340 if ( status == CD_PLAYING || (status == CD_PAUSED) ) {
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341 *position = MSF_TO_FRAMES(
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342 data.what.position.absaddr.msf.minute,
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343 data.what.position.absaddr.msf.second,
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344 data.what.position.absaddr.msf.frame);
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345 } else {
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346 *position = 0;
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347 }
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348 }
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349 return(status);
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350 }
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351
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352 /* Start play */
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353 static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length)
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354 {
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355 struct ioc_play_msf playtime;
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356
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357 FRAMES_TO_MSF(start,
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358 &playtime.start_m, &playtime.start_s, &playtime.start_f);
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359 FRAMES_TO_MSF(start+length,
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360 &playtime.end_m, &playtime.end_s, &playtime.end_f);
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361 #ifdef DEBUG_CDROM
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362 fprintf(stderr, "Trying to play from %d:%d:%d to %d:%d:%d\n",
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363 playtime.cdmsf_min0, playtime.cdmsf_sec0, playtime.cdmsf_frame0,
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364 playtime.cdmsf_min1, playtime.cdmsf_sec1, playtime.cdmsf_frame1);
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365 #endif
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366 ioctl(cdrom->id, CDIOCSTART, 0);
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367 return(SDL_SYS_CDioctl(cdrom->id, CDIOCPLAYMSF, &playtime));
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368 }
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369
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370 /* Pause play */
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371 static int SDL_SYS_CDPause(SDL_CD *cdrom)
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372 {
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373 return(SDL_SYS_CDioctl(cdrom->id, CDIOCPAUSE, 0));
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374 }
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375
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376 /* Resume play */
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377 static int SDL_SYS_CDResume(SDL_CD *cdrom)
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378 {
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379 return(SDL_SYS_CDioctl(cdrom->id, CDIOCRESUME, 0));
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380 }
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381
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382 /* Stop play */
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383 static int SDL_SYS_CDStop(SDL_CD *cdrom)
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384 {
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385 return(SDL_SYS_CDioctl(cdrom->id, CDIOCSTOP, 0));
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386 }
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387
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388 /* Eject the CD-ROM */
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389 static int SDL_SYS_CDEject(SDL_CD *cdrom)
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390 {
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391 return(SDL_SYS_CDioctl(cdrom->id, CDIOCEJECT, 0));
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392 }
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393
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394 /* Close the CD-ROM handle */
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395 static void SDL_SYS_CDClose(SDL_CD *cdrom)
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396 {
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397 close(cdrom->id);
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398 }
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399
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400 void SDL_SYS_CDQuit(void)
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401 {
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402 int i;
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403
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404 if ( SDL_numcds > 0 ) {
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405 for ( i=0; i<SDL_numcds; ++i ) {
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406 free(SDL_cdlist[i]);
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407 }
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408 SDL_numcds = 0;
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409 }
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410 }
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411
|
