src/cdrom/openbsd/SDL_syscdrom.c
author Sam Lantinga <slouken@libsdl.org>
Fri, 14 Dec 2001 13:13:20 +0000
changeset 254 4fc12b8edf74
parent 252 e8157fcb3114
child 297 f6ffac90895c
permissions -rw-r--r--
*** empty log message ***
     1 /*
     2     SDL - Simple DirectMedia Layer
     3     Copyright (C) 1997, 1998, 1999, 2000, 2001  Sam Lantinga
     4 
     5     This library is free software; you can redistribute it and/or
     6     modify it under the terms of the GNU Library General Public
     7     License as published by the Free Software Foundation; either
     8     version 2 of the License, or (at your option) any later version.
     9 
    10     This library is distributed in the hope that it will be useful,
    11     but WITHOUT ANY WARRANTY; without even the implied warranty of
    12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    13     Library General Public License for more details.
    14 
    15     You should have received a copy of the GNU Library General Public
    16     License along with this library; if not, write to the Free
    17     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
    18 
    19     Sam Lantinga
    20     slouken@libsdl.org
    21 */
    22 
    23 #ifdef SAVE_RCSID
    24 static char rcsid =
    25  "@(#) $Id$";
    26 #endif
    27 
    28 /* Functions for system-level CD-ROM audio control */
    29 
    30 #include <sys/types.h>
    31 #include <sys/ioctl.h>
    32 #include <stdlib.h>
    33 #include <sys/stat.h>
    34 #include <fcntl.h>
    35 #include <stdio.h>
    36 #include <string.h>
    37 #include <errno.h>
    38 #include <unistd.h>
    39 #include <sys/ioctl.h>
    40 #include <sys/cdio.h>
    41 
    42 #include "SDL_error.h"
    43 #include "SDL_cdrom.h"
    44 #include "SDL_syscdrom.h"
    45 
    46 
    47 /* The maximum number of CD-ROM drives we'll detect */
    48 #define MAX_DRIVES	16	
    49 
    50 /* A list of available CD-ROM drives */
    51 static char *SDL_cdlist[MAX_DRIVES];
    52 static dev_t SDL_cdmode[MAX_DRIVES];
    53 
    54 /* The system-dependent CD control functions */
    55 static const char *SDL_SYS_CDName(int drive);
    56 static int SDL_SYS_CDOpen(int drive);
    57 static int SDL_SYS_CDGetTOC(SDL_CD *cdrom);
    58 static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position);
    59 static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length);
    60 static int SDL_SYS_CDPause(SDL_CD *cdrom);
    61 static int SDL_SYS_CDResume(SDL_CD *cdrom);
    62 static int SDL_SYS_CDStop(SDL_CD *cdrom);
    63 static int SDL_SYS_CDEject(SDL_CD *cdrom);
    64 static void SDL_SYS_CDClose(SDL_CD *cdrom);
    65 
    66 /* Some ioctl() errno values which occur when the tray is empty */
    67 #define ERRNO_TRAYEMPTY(errno)	\
    68 	((errno == EIO) || (errno == ENOENT) || (errno == EINVAL) || \
    69 	 (errno == ENODEV))
    70 
    71 /* Check a drive to see if it is a CD-ROM */
    72 static int CheckDrive(char *drive, struct stat *stbuf)
    73 {
    74 	int is_cd, cdfd;
    75 	struct ioc_read_subchannel info;
    76 
    77 	/* If it doesn't exist, return -1 */
    78 	if ( stat(drive, stbuf) < 0 ) {
    79 		return(-1);
    80 	}
    81 
    82 	/* If it does exist, verify that it's an available CD-ROM */
    83 	is_cd = 0;
    84 	if ( S_ISCHR(stbuf->st_mode) || S_ISBLK(stbuf->st_mode) ) {
    85 		cdfd = open(drive, (O_RDONLY|O_EXCL|O_NONBLOCK), 0);
    86 		if ( cdfd >= 0 ) {
    87 			info.address_format = CD_MSF_FORMAT;
    88 			info.data_format = CD_CURRENT_POSITION;
    89 			info.data_len = 0;
    90 			info.data = NULL;
    91 			/* Under Linux, EIO occurs when a disk is not present.
    92 			   This isn't 100% reliable, so we use the USE_MNTENT
    93 			   code above instead.
    94 			 */
    95 			if ( (ioctl(cdfd, CDIOCREADSUBCHANNEL, &info) == 0) ||
    96 						ERRNO_TRAYEMPTY(errno) ) {
    97 				is_cd = 1;
    98 			}
    99 			close(cdfd);
   100 		}
   101 		else if (ERRNO_TRAYEMPTY(errno))
   102 			is_cd = 1;
   103 	}
   104 	return(is_cd);
   105 }
   106 
   107 /* Add a CD-ROM drive to our list of valid drives */
   108 static void AddDrive(char *drive, struct stat *stbuf)
   109 {
   110 	int i;
   111 
   112 	if ( SDL_numcds < MAX_DRIVES ) {
   113 		/* Check to make sure it's not already in our list.
   114 	 	   This can happen when we see a drive via symbolic link.
   115 		 */
   116 		for ( i=0; i<SDL_numcds; ++i ) {
   117 			if ( stbuf->st_rdev == SDL_cdmode[i] ) {
   118 #ifdef DEBUG_CDROM
   119   fprintf(stderr, "Duplicate drive detected: %s == %s\n", drive, SDL_cdlist[i]);
   120 #endif
   121 				return;
   122 			}
   123 		}
   124 
   125 		/* Add this drive to our list */
   126 		i = SDL_numcds;
   127 		SDL_cdlist[i] = (char *)malloc(strlen(drive)+1);
   128 		if ( SDL_cdlist[i] == NULL ) {
   129 			SDL_OutOfMemory();
   130 			return;
   131 		}
   132 		strcpy(SDL_cdlist[i], drive);
   133 		SDL_cdmode[i] = stbuf->st_rdev;
   134 		++SDL_numcds;
   135 #ifdef DEBUG_CDROM
   136   fprintf(stderr, "Added CD-ROM drive: %s\n", drive);
   137 #endif
   138 	}
   139 }
   140 
   141 int  SDL_SYS_CDInit(void)
   142 {
   143 	static char *checklist[] = {
   144 #ifdef __OpenBSD__
   145 		"?0 cd?c", "cdrom", NULL
   146 #else
   147 		"?0 cd?c", "?0 acd?c", "cdrom", NULL
   148 #endif
   149 	};
   150 	char *SDLcdrom;
   151 	int i, j, exists;
   152 	char drive[32];
   153 	struct stat stbuf;
   154 
   155 	/* Fill in our driver capabilities */
   156 	SDL_CDcaps.Name = SDL_SYS_CDName;
   157 	SDL_CDcaps.Open = SDL_SYS_CDOpen;
   158 	SDL_CDcaps.GetTOC = SDL_SYS_CDGetTOC;
   159 	SDL_CDcaps.Status = SDL_SYS_CDStatus;
   160 	SDL_CDcaps.Play = SDL_SYS_CDPlay;
   161 	SDL_CDcaps.Pause = SDL_SYS_CDPause;
   162 	SDL_CDcaps.Resume = SDL_SYS_CDResume;
   163 	SDL_CDcaps.Stop = SDL_SYS_CDStop;
   164 	SDL_CDcaps.Eject = SDL_SYS_CDEject;
   165 	SDL_CDcaps.Close = SDL_SYS_CDClose;
   166 
   167 	/* Look in the environment for our CD-ROM drive list */
   168 	SDLcdrom = getenv("SDL_CDROM");	/* ':' separated list of devices */
   169 	if ( SDLcdrom != NULL ) {
   170 		char *cdpath, *delim;
   171 		cdpath = malloc(strlen(SDLcdrom)+1);
   172 		if ( cdpath != NULL ) {
   173 			strcpy(cdpath, SDLcdrom);
   174 			SDLcdrom = cdpath;
   175 			do {
   176 				delim = strchr(SDLcdrom, ':');
   177 				if ( delim ) {
   178 					*delim++ = '\0';
   179 				}
   180 				if ( CheckDrive(SDLcdrom, &stbuf) > 0 ) {
   181 					AddDrive(SDLcdrom, &stbuf);
   182 				}
   183 				if ( delim ) {
   184 					SDLcdrom = delim;
   185 				} else {
   186 					SDLcdrom = NULL;
   187 				}
   188 			} while ( SDLcdrom );
   189 			free(cdpath);
   190 		}
   191 
   192 		/* If we found our drives, there's nothing left to do */
   193 		if ( SDL_numcds > 0 ) {
   194 			return(0);
   195 		}
   196 	}
   197 
   198 	/* Scan the system for CD-ROM drives */
   199 	for ( i=0; checklist[i]; ++i ) {
   200 		if ( checklist[i][0] == '?' ) {
   201 			char *insert;
   202 			exists = 1;
   203 			for ( j=checklist[i][1]; exists; ++j ) {
   204 				sprintf(drive, "/dev/%s", &checklist[i][3]);
   205 				insert = strchr(drive, '?');
   206 				if ( insert != NULL ) {
   207 					*insert = j;
   208 				}
   209 				switch (CheckDrive(drive, &stbuf)) {
   210 					/* Drive exists and is a CD-ROM */
   211 					case 1:
   212 						AddDrive(drive, &stbuf);
   213 						break;
   214 					/* Drive exists, but isn't a CD-ROM */
   215 					case 0:
   216 						break;
   217 					/* Drive doesn't exist */
   218 					case -1:
   219 						exists = 0;
   220 						break;
   221 				}
   222 			}
   223 		} else {
   224 			sprintf(drive, "/dev/%s", checklist[i]);
   225 			if ( CheckDrive(drive, &stbuf) > 0 ) {
   226 				AddDrive(drive, &stbuf);
   227 			}
   228 		}
   229 	}
   230 	return(0);
   231 }
   232 
   233 /* General ioctl() CD-ROM command function */
   234 static int SDL_SYS_CDioctl(int id, int command, void *arg)
   235 {
   236 	int retval;
   237 
   238 	retval = ioctl(id, command, arg);
   239 	if ( retval < 0 ) {
   240 		SDL_SetError("ioctl() error: %s", strerror(errno));
   241 	}
   242 	return(retval);
   243 }
   244 
   245 static const char *SDL_SYS_CDName(int drive)
   246 {
   247 	return(SDL_cdlist[drive]);
   248 }
   249 
   250 static int SDL_SYS_CDOpen(int drive)
   251 {
   252 	return(open(SDL_cdlist[drive], (O_RDONLY|O_EXCL|O_NONBLOCK), 0));
   253 }
   254 
   255 static int SDL_SYS_CDGetTOC(SDL_CD *cdrom)
   256 {
   257 	struct ioc_toc_header toc;
   258 	int i, okay;
   259 	struct ioc_read_toc_entry entry;
   260 	struct cd_toc_entry data;
   261 
   262 	okay = 0;
   263 	if ( SDL_SYS_CDioctl(cdrom->id, CDIOREADTOCHEADER, &toc) == 0 ) {
   264 		cdrom->numtracks = toc.ending_track-toc.starting_track+1;
   265 		if ( cdrom->numtracks > SDL_MAX_TRACKS ) {
   266 			cdrom->numtracks = SDL_MAX_TRACKS;
   267 		}
   268 		/* Read all the track TOC entries */
   269 		for ( i=0; i<=cdrom->numtracks; ++i ) {
   270 			if ( i == cdrom->numtracks ) {
   271 				cdrom->track[i].id = 0xAA; /* CDROM_LEADOUT */
   272 			} else {
   273 				cdrom->track[i].id = toc.starting_track+i;
   274 			}
   275 			entry.starting_track = cdrom->track[i].id;
   276 			entry.address_format = CD_MSF_FORMAT;
   277 			entry.data_len = sizeof(data);
   278 			entry.data = &data;
   279 			if ( SDL_SYS_CDioctl(cdrom->id, CDIOREADTOCENTRYS,
   280 								&entry) < 0 ) {
   281 				break;
   282 			} else {
   283 				cdrom->track[i].type = data.control;
   284 				cdrom->track[i].offset = MSF_TO_FRAMES(
   285 						data.addr.msf.minute,
   286 						data.addr.msf.second,
   287 						data.addr.msf.frame);
   288 				cdrom->track[i].length = 0;
   289 				if ( i > 0 ) {
   290 					cdrom->track[i-1].length =
   291 						cdrom->track[i].offset-
   292 						cdrom->track[i-1].offset;
   293 				}
   294 			}
   295 		}
   296 		if ( i == (cdrom->numtracks+1) ) {
   297 			okay = 1;
   298 		}
   299 	}
   300 	return(okay ? 0 : -1);
   301 }
   302 
   303 /* Get CD-ROM status */
   304 static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position)
   305 {
   306 	CDstatus status;
   307 	struct ioc_toc_header toc;
   308 	struct ioc_read_subchannel info;
   309 	struct cd_sub_channel_info data;
   310 
   311 	info.address_format = CD_MSF_FORMAT;
   312 	info.data_format = CD_CURRENT_POSITION;
   313 	info.track = 0;
   314 	info.data_len = sizeof(data);
   315 	info.data = &data;
   316 	if ( ioctl(cdrom->id, CDIOCREADSUBCHANNEL, &info) < 0 ) {
   317 		if ( ERRNO_TRAYEMPTY(errno) ) {
   318 			status = CD_TRAYEMPTY;
   319 		} else {
   320 			status = CD_ERROR;
   321 		}
   322 	} else {
   323 		switch (data.header.audio_status) {
   324 			case CD_AS_AUDIO_INVALID:
   325 			case CD_AS_NO_STATUS:
   326 				/* Try to determine if there's a CD available */
   327 				if (ioctl(cdrom->id,CDIOREADTOCHEADER,&toc)==0)
   328 					status = CD_STOPPED;
   329 				else
   330 					status = CD_TRAYEMPTY;
   331 				break;
   332 			case CD_AS_PLAY_COMPLETED:
   333 				status = CD_STOPPED;
   334 				break;
   335 			case CD_AS_PLAY_IN_PROGRESS:
   336 				status = CD_PLAYING;
   337 				break;
   338 			case CD_AS_PLAY_PAUSED:
   339 				status = CD_PAUSED;
   340 				break;
   341 			default:
   342 				status = CD_ERROR;
   343 				break;
   344 		}
   345 	}
   346 	if ( position ) {
   347 		if ( status == CD_PLAYING || (status == CD_PAUSED) ) {
   348 			*position = MSF_TO_FRAMES(
   349 					data.what.position.absaddr.msf.minute,
   350 					data.what.position.absaddr.msf.second,
   351 					data.what.position.absaddr.msf.frame);
   352 		} else {
   353 			*position = 0;
   354 		}
   355 	}
   356 	return(status);
   357 }
   358 
   359 /* Start play */
   360 static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length)
   361 {
   362 	struct ioc_play_msf playtime;
   363 
   364 	FRAMES_TO_MSF(start,
   365 		&playtime.start_m, &playtime.start_s, &playtime.start_f);
   366 	FRAMES_TO_MSF(start+length,
   367 		&playtime.end_m, &playtime.end_s, &playtime.end_f);
   368 #ifdef DEBUG_CDROM
   369   fprintf(stderr, "Trying to play from %d:%d:%d to %d:%d:%d\n",
   370 	playtime.start_m, playtime.start_s, playtime.start_f,
   371 	playtime.end_m, playtime.end_s, playtime.end_f);
   372 #endif
   373 	ioctl(cdrom->id, CDIOCSTART, 0);
   374 	return(SDL_SYS_CDioctl(cdrom->id, CDIOCPLAYMSF, &playtime));
   375 }
   376 
   377 /* Pause play */
   378 static int SDL_SYS_CDPause(SDL_CD *cdrom)
   379 {
   380 	return(SDL_SYS_CDioctl(cdrom->id, CDIOCPAUSE, 0));
   381 }
   382 
   383 /* Resume play */
   384 static int SDL_SYS_CDResume(SDL_CD *cdrom)
   385 {
   386 	return(SDL_SYS_CDioctl(cdrom->id, CDIOCRESUME, 0));
   387 }
   388 
   389 /* Stop play */
   390 static int SDL_SYS_CDStop(SDL_CD *cdrom)
   391 {
   392 	return(SDL_SYS_CDioctl(cdrom->id, CDIOCSTOP, 0));
   393 }
   394 
   395 /* Eject the CD-ROM */
   396 static int SDL_SYS_CDEject(SDL_CD *cdrom)
   397 {
   398 	return(SDL_SYS_CDioctl(cdrom->id, CDIOCEJECT, 0));
   399 }
   400 
   401 /* Close the CD-ROM handle */
   402 static void SDL_SYS_CDClose(SDL_CD *cdrom)
   403 {
   404 	close(cdrom->id);
   405 }
   406 
   407 void SDL_SYS_CDQuit(void)
   408 {
   409 	int i;
   410 
   411 	if ( SDL_numcds > 0 ) {
   412 		for ( i=0; i<SDL_numcds; ++i ) {
   413 			free(SDL_cdlist[i]);
   414 		}
   415 		SDL_numcds = 0;
   416 	}
   417 }
   418