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annotate src/cdrom/freebsd/SDL_syscdrom.c @ 1675:d33dcfc3fde7 SDL-1.3

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Overlay functions are being replaced by YUV textures. If the driver doesn't support YUV textures, they can be emulated by backing the texture with an RGB texture and using the software conversion routines. Note that it doesn't make sense to lock a portion of a YV12 texture, since you'd need to return three pixel pointers and pitch values instead of the one that's available through the API. I'm guessing that's one of the reasons DirectX 9 doesn't support this format at all.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 11 Jun 2006 07:30:16 +0000
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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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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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293 }
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294 }
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295 return (okay ? 0 : -1);
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296 }
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297
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298 /* Get CD-ROM status */
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299 static CDstatus
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300 SDL_SYS_CDStatus(SDL_CD * cdrom, int *position)
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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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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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330 break;
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331 case CD_AS_PLAY_IN_PROGRESS:
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332 status = CD_PLAYING;
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333 break;
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334 case CD_AS_PLAY_PAUSED:
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335 status = CD_PAUSED;
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336 break;
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337 default:
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338 status = CD_ERROR;
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339 break;
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340 }
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341 }
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342 if (position) {
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343 if (status == CD_PLAYING || (status == CD_PAUSED)) {
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344 *position =
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345 MSF_TO_FRAMES(data.what.position.absaddr.msf.minute,
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346 data.what.position.absaddr.msf.second,
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347 data.what.position.absaddr.msf.frame);
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348 } else {
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349 *position = 0;
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350 }
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351 }
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352 return (status);
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353 }
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354
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355 /* Start play */
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356 static int
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357 SDL_SYS_CDPlay(SDL_CD * cdrom, int start, int length)
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358 {
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359 struct ioc_play_msf playtime;
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360
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361 FRAMES_TO_MSF(start,
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362 &playtime.start_m, &playtime.start_s, &playtime.start_f);
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363 FRAMES_TO_MSF(start + length,
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364 &playtime.end_m, &playtime.end_s, &playtime.end_f);
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365 #ifdef DEBUG_CDROM
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366 fprintf(stderr, "Trying to play from %d:%d:%d to %d:%d:%d\n",
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367 playtime.cdmsf_min0, playtime.cdmsf_sec0, playtime.cdmsf_frame0,
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368 playtime.cdmsf_min1, playtime.cdmsf_sec1, playtime.cdmsf_frame1);
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diff changeset
369 #endif
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370 ioctl(cdrom->id, CDIOCSTART, 0);
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371 return (SDL_SYS_CDioctl(cdrom->id, CDIOCPLAYMSF, &playtime));
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372 }
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373
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374 /* Pause play */
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375 static int
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376 SDL_SYS_CDPause(SDL_CD * cdrom)
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377 {
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378 return (SDL_SYS_CDioctl(cdrom->id, CDIOCPAUSE, 0));
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379 }
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380
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381 /* Resume play */
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382 static int
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383 SDL_SYS_CDResume(SDL_CD * cdrom)
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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: */