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annotate src/cdrom/freebsd/SDL_syscdrom.c @ 1668:4da1ee79c9af SDL-1.3

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more tweaking indent options
author Sam Lantinga <slouken@libsdl.org>
date Mon, 29 May 2006 04:04:35 +0000
parents 782fd950bd46
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 #ifdef SDL_CDROM_FREEBSD
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25
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26 /* Functions for system-level CD-ROM audio control */
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27
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28 #include <sys/types.h>
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29 #include <sys/stat.h>
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30 #include <fcntl.h>
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31 #include <errno.h>
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32 #include <unistd.h>
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33 #include <sys/cdio.h>
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34
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35 #include "SDL_cdrom.h"
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36 #include "../SDL_syscdrom.h"
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37
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38
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39 /* The maximum number of CD-ROM drives we'll detect */
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40 #define MAX_DRIVES 16
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41
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42 /* A list of available CD-ROM drives */
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43 static char *SDL_cdlist[MAX_DRIVES];
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44 static dev_t SDL_cdmode[MAX_DRIVES];
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45
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46 /* The system-dependent CD control functions */
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47 static const char *SDL_SYS_CDName(int drive);
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48 static int SDL_SYS_CDOpen(int drive);
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49 static int SDL_SYS_CDGetTOC(SDL_CD * cdrom);
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50 static CDstatus SDL_SYS_CDStatus(SDL_CD * cdrom, int *position);
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51 static int SDL_SYS_CDPlay(SDL_CD * cdrom, int start, int length);
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52 static int SDL_SYS_CDPause(SDL_CD * cdrom);
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53 static int SDL_SYS_CDResume(SDL_CD * cdrom);
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54 static int SDL_SYS_CDStop(SDL_CD * cdrom);
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55 static int SDL_SYS_CDEject(SDL_CD * cdrom);
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56 static void SDL_SYS_CDClose(SDL_CD * cdrom);
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57
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58 /* Some ioctl() errno values which occur when the tray is empty */
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59 #define ERRNO_TRAYEMPTY(errno) \
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60 ((errno == EIO) || (errno == ENOENT) || (errno == EINVAL))
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61
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62 /* Check a drive to see if it is a CD-ROM */
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63 static int
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64 CheckDrive(char *drive, struct stat *stbuf)
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65 {
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66 int is_cd, cdfd;
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67 struct ioc_read_subchannel info;
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68
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69 /* If it doesn't exist, return -1 */
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70 if (stat(drive, stbuf) < 0) {
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71 return (-1);
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72 }
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73
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74 /* If it does exist, verify that it's an available CD-ROM */
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75 is_cd = 0;
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76 if (S_ISCHR(stbuf->st_mode) || S_ISBLK(stbuf->st_mode)) {
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77 cdfd = open(drive, (O_RDONLY | O_EXCL | O_NONBLOCK), 0);
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78 if (cdfd >= 0) {
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79 info.address_format = CD_MSF_FORMAT;
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80 info.data_format = CD_CURRENT_POSITION;
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81 info.data_len = 0;
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82 info.data = NULL;
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83 /* Under Linux, EIO occurs when a disk is not present.
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84 This isn't 100% reliable, so we use the USE_MNTENT
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85 code above instead.
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86 */
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87 if ((ioctl(cdfd, CDIOCREADSUBCHANNEL, &info) == 0) ||
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88 ERRNO_TRAYEMPTY(errno)) {
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89 is_cd = 1;
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90 }
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91 close(cdfd);
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92 }
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93 }
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94 return (is_cd);
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95 }
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96
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97 /* Add a CD-ROM drive to our list of valid drives */
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98 static void
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99 AddDrive(char *drive, struct stat *stbuf)
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100 {
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101 int i;
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102
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103 if (SDL_numcds < MAX_DRIVES) {
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104 /* Check to make sure it's not already in our list.
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105 This can happen when we see a drive via symbolic link.
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106 */
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107 for (i = 0; i < SDL_numcds; ++i) {
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108 if (stbuf->st_rdev == SDL_cdmode[i]) {
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109 #ifdef DEBUG_CDROM
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110 fprintf(stderr, "Duplicate drive detected: %s == %s\n",
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111 drive, SDL_cdlist[i]);
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112 #endif
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113 return;
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114 }
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115 }
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116
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117 /* Add this drive to our list */
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118 i = SDL_numcds;
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119 SDL_cdlist[i] = SDL_strdup(drive);
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120 if (SDL_cdlist[i] == NULL) {
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121 SDL_OutOfMemory();
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122 return;
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123 }
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124 SDL_cdmode[i] = stbuf->st_rdev;
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125 ++SDL_numcds;
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126 #ifdef DEBUG_CDROM
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127 fprintf(stderr, "Added CD-ROM drive: %s\n", drive);
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128 #endif
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129 }
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130 }
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131
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132 int
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133 SDL_SYS_CDInit(void)
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134 {
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135 /* checklist: /dev/cdrom,/dev/cd?c /dev/acd?c
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136 /dev/matcd?c /dev/mcd?c /dev/scd?c */
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137 static char *checklist[] = {
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138 "cdrom", "?0 cd?", "?0 acd?", "?0 matcd?", "?0 mcd?", "?0 scd?", NULL
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139 };
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140 char *SDLcdrom;
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141 int i, j, exists;
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142 char drive[32];
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143 struct stat stbuf;
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144
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145 /* Fill in our driver capabilities */
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146 SDL_CDcaps.Name = SDL_SYS_CDName;
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147 SDL_CDcaps.Open = SDL_SYS_CDOpen;
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148 SDL_CDcaps.GetTOC = SDL_SYS_CDGetTOC;
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149 SDL_CDcaps.Status = SDL_SYS_CDStatus;
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150 SDL_CDcaps.Play = SDL_SYS_CDPlay;
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151 SDL_CDcaps.Pause = SDL_SYS_CDPause;
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152 SDL_CDcaps.Resume = SDL_SYS_CDResume;
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153 SDL_CDcaps.Stop = SDL_SYS_CDStop;
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154 SDL_CDcaps.Eject = SDL_SYS_CDEject;
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155 SDL_CDcaps.Close = SDL_SYS_CDClose;
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156
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157 /* Look in the environment for our CD-ROM drive list */
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158 SDLcdrom = SDL_getenv("SDL_CDROM"); /* ':' separated list of devices */
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159 if (SDLcdrom != NULL) {
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160 char *cdpath, *delim;
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161 size_t len = SDL_strlen(SDLcdrom) + 1;
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162 cdpath = SDL_stack_alloc(char, len);
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163 if (cdpath != NULL) {
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164 SDL_strlcpy(cdpath, SDLcdrom, len);
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165 SDLcdrom = cdpath;
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166 do {
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167 delim = SDL_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 if (CheckDrive(SDLcdrom, &stbuf) > 0) {
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172 AddDrive(SDLcdrom, &stbuf);
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173 }
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174 if (delim) {
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175 SDLcdrom = delim;
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176 } else {
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177 SDLcdrom = NULL;
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178 }
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179 }
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180 while (SDLcdrom);
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181 SDL_stack_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 SDL_snprintf(drive, SDL_arraysize(drive), "/dev/%sc",
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197 &checklist[i][3]);
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198 insert = SDL_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 SDL_snprintf(drive, SDL_arraysize(drive), "/dev/%s",
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218 checklist[i]);
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219 if (CheckDrive(drive, &stbuf) > 0) {
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220 AddDrive(drive, &stbuf);
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221 }
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222 }
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223 }
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224 return (0);
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225 }
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226
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227 /* General ioctl() CD-ROM command function */
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228 static int
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229 SDL_SYS_CDioctl(int id, int command, void *arg)
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230 {
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231 int retval;
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232
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233 retval = ioctl(id, command, arg);
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234 if (retval < 0) {
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235 SDL_SetError("ioctl() error: %s", strerror(errno));
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236 }
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237 return (retval);
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238 }
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239
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240 static const char *
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241 SDL_SYS_CDName(int drive)
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242 {
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243 return (SDL_cdlist[drive]);
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244 }
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245
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246 static int
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247 SDL_SYS_CDOpen(int drive)
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248 {
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249 return (open(SDL_cdlist[drive], (O_RDONLY | O_EXCL | O_NONBLOCK), 0));
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250 }
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251
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252 static int
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253 SDL_SYS_CDGetTOC(SDL_CD * cdrom)
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254 {
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255 struct ioc_toc_header toc;
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256 int i, okay;
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257 struct ioc_read_toc_entry entry;
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258 struct cd_toc_entry data;
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259
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260 okay = 0;
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261 if (SDL_SYS_CDioctl(cdrom->id, CDIOREADTOCHEADER, &toc) == 0) {
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262 cdrom->numtracks = toc.ending_track - toc.starting_track + 1;
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263 if (cdrom->numtracks > SDL_MAX_TRACKS) {
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264 cdrom->numtracks = SDL_MAX_TRACKS;
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265 }
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266 /* Read all the track TOC entries */
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267 for (i = 0; i <= cdrom->numtracks; ++i) {
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268 if (i == cdrom->numtracks) {
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269 cdrom->track[i].id = 0xAA; /* CDROM_LEADOUT */
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270 } else {
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271 cdrom->track[i].id = toc.starting_track + i;
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272 }
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diff changeset
273 entry.starting_track = cdrom->track[i].id;
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274 entry.address_format = CD_MSF_FORMAT;
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275 entry.data_len = sizeof(data);
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276 entry.data = &data;
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277 if (SDL_SYS_CDioctl(cdrom->id, CDIOREADTOCENTRYS, &entry) < 0) {
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278 break;
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279 } else {
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280 cdrom->track[i].type = data.control;
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281 cdrom->track[i].offset =
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282 MSF_TO_FRAMES(data.addr.msf.minute,
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283 data.addr.msf.second, data.addr.msf.frame);
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284 cdrom->track[i].length = 0;
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285 if (i > 0) {
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286 cdrom->track[i - 1].length =
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287 cdrom->track[i].offset - cdrom->track[i - 1].offset;
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288 }
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289 }
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290 }
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291 if (i == (cdrom->numtracks + 1)) {
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292 okay = 1;
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diff changeset
293 }
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diff changeset
294 }
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diff changeset
295 return (okay ? 0 : -1);
0
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296 }
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297
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298 /* Get CD-ROM status */
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diff changeset
299 static CDstatus
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300 SDL_SYS_CDStatus(SDL_CD * cdrom, int *position)
0
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301 {
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302 CDstatus status;
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303 struct ioc_toc_header toc;
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304 struct ioc_read_subchannel info;
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diff changeset
305 struct cd_sub_channel_info data;
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306
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307 info.address_format = CD_MSF_FORMAT;
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308 info.data_format = CD_CURRENT_POSITION;
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309 info.track = 0;
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310 info.data_len = sizeof(data);
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311 info.data = &data;
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312 if (ioctl(cdrom->id, CDIOCREADSUBCHANNEL, &info) < 0) {
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313 if (ERRNO_TRAYEMPTY(errno)) {
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314 status = CD_TRAYEMPTY;
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315 } else {
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316 status = CD_ERROR;
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317 }
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318 } else {
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319 switch (data.header.audio_status) {
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320 case CD_AS_AUDIO_INVALID:
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321 case CD_AS_NO_STATUS:
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322 /* Try to determine if there's a CD available */
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323 if (ioctl(cdrom->id, CDIOREADTOCHEADER, &toc) == 0)
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324 status = CD_STOPPED;
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325 else
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326 status = CD_TRAYEMPTY;
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327 break;
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328 case CD_AS_PLAY_COMPLETED:
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329 status = CD_STOPPED;
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diff changeset
330 break;
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diff changeset
331 case CD_AS_PLAY_IN_PROGRESS:
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diff changeset
332 status = CD_PLAYING;
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333 break;
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diff changeset
334 case CD_AS_PLAY_PAUSED:
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diff changeset
335 status = CD_PAUSED;
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336 break;
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diff changeset
337 default:
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diff changeset
338 status = CD_ERROR;
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diff changeset
339 break;
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diff changeset
340 }
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diff changeset
341 }
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diff changeset
342 if (position) {
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diff changeset
343 if (status == CD_PLAYING || (status == CD_PAUSED)) {
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diff changeset
344 *position =
1668
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diff changeset
345 MSF_TO_FRAMES(data.what.position.absaddr.msf.minute,
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diff changeset
346 data.what.position.absaddr.msf.second,
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diff changeset
347 data.what.position.absaddr.msf.frame);
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diff changeset
348 } else {
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diff changeset
349 *position = 0;
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diff changeset
350 }
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diff changeset
351 }
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diff changeset
352 return (status);
0
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diff changeset
353 }
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diff changeset
354
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diff changeset
355 /* Start play */
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diff changeset
356 static int
1668
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diff changeset
357 SDL_SYS_CDPlay(SDL_CD * cdrom, int start, int length)
0
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diff changeset
358 {
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diff changeset
359 struct ioc_play_msf playtime;
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diff changeset
360
1668
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diff changeset
361 FRAMES_TO_MSF(start,
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diff changeset
362 &playtime.start_m, &playtime.start_s, &playtime.start_f);
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diff changeset
363 FRAMES_TO_MSF(start + length,
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diff changeset
364 &playtime.end_m, &playtime.end_s, &playtime.end_f);
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diff changeset
365 #ifdef DEBUG_CDROM
1668
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diff changeset
366 fprintf(stderr, "Trying to play from %d:%d:%d to %d:%d:%d\n",
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diff changeset
367 playtime.cdmsf_min0, playtime.cdmsf_sec0, playtime.cdmsf_frame0,
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diff changeset
368 playtime.cdmsf_min1, playtime.cdmsf_sec1, playtime.cdmsf_frame1);
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diff changeset
369 #endif
1668
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diff changeset
370 ioctl(cdrom->id, CDIOCSTART, 0);
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diff changeset
371 return (SDL_SYS_CDioctl(cdrom->id, CDIOCPLAYMSF, &playtime));
0
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diff changeset
372 }
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diff changeset
373
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diff changeset
374 /* Pause play */
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diff changeset
375 static int
1668
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diff changeset
376 SDL_SYS_CDPause(SDL_CD * cdrom)
0
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diff changeset
377 {
1668
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diff changeset
378 return (SDL_SYS_CDioctl(cdrom->id, CDIOCPAUSE, 0));
0
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diff changeset
379 }
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diff changeset
380
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diff changeset
381 /* Resume play */
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diff changeset
382 static int
1668
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diff changeset
383 SDL_SYS_CDResume(SDL_CD * cdrom)
0
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diff changeset
384 {
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385 return (SDL_SYS_CDioctl(cdrom->id, CDIOCRESUME, 0));
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386 }
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387
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388 /* Stop play */
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389 static int
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390 SDL_SYS_CDStop(SDL_CD * cdrom)
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391 {
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392 return (SDL_SYS_CDioctl(cdrom->id, CDIOCSTOP, 0));
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393 }
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394
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395 /* Eject the CD-ROM */
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396 static int
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397 SDL_SYS_CDEject(SDL_CD * cdrom)
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398 {
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399 return (SDL_SYS_CDioctl(cdrom->id, CDIOCEJECT, 0));
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400 }
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401
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402 /* Close the CD-ROM handle */
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403 static void
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404 SDL_SYS_CDClose(SDL_CD * cdrom)
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405 {
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406 close(cdrom->id);
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407 }
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408
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409 void
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410 SDL_SYS_CDQuit(void)
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411 {
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412 int i;
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413
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414 if (SDL_numcds > 0) {
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415 for (i = 0; i < SDL_numcds; ++i) {
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416 SDL_free(SDL_cdlist[i]);
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417 }
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418 SDL_numcds = 0;
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419 }
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420 }
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421
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422 #endif /* SDL_CDROM_FREEBSD */
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423 /* vi: set ts=4 sw=4 expandtab: */