src/cdrom/freebsd/SDL_syscdrom.c
author Sam Lantinga <slouken@libsdl.org>
Fri, 14 Dec 2001 12:30:25 +0000
changeset 249 e3d0d44f6f2e
parent 0 74212992fb08
child 252 e8157fcb3114
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@devolution.com
    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 <stdlib.h>
    32 #include <sys/stat.h>
    33 #include <fcntl.h>
    34 #include <stdio.h>
    35 #include <string.h>
    36 #include <errno.h>
    37 #include <unistd.h>
    38 #include <sys/cdio.h>
    39 
    40 #include "SDL_error.h"
    41 #include "SDL_cdrom.h"
    42 #include "SDL_syscdrom.h"
    43 
    44 
    45 /* The maximum number of CD-ROM drives we'll detect */
    46 #define MAX_DRIVES	16	
    47 
    48 /* A list of available CD-ROM drives */
    49 static char *SDL_cdlist[MAX_DRIVES];
    50 static dev_t SDL_cdmode[MAX_DRIVES];
    51 
    52 /* The system-dependent CD control functions */
    53 static const char *SDL_SYS_CDName(int drive);
    54 static int SDL_SYS_CDOpen(int drive);
    55 static int SDL_SYS_CDGetTOC(SDL_CD *cdrom);
    56 static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position);
    57 static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length);
    58 static int SDL_SYS_CDPause(SDL_CD *cdrom);
    59 static int SDL_SYS_CDResume(SDL_CD *cdrom);
    60 static int SDL_SYS_CDStop(SDL_CD *cdrom);
    61 static int SDL_SYS_CDEject(SDL_CD *cdrom);
    62 static void SDL_SYS_CDClose(SDL_CD *cdrom);
    63 
    64 /* Some ioctl() errno values which occur when the tray is empty */
    65 #define ERRNO_TRAYEMPTY(errno)	\
    66 	((errno == EIO) || (errno == ENOENT) || (errno == EINVAL))
    67 
    68 /* Check a drive to see if it is a CD-ROM */
    69 static int CheckDrive(char *drive, struct stat *stbuf)
    70 {
    71 	int is_cd, cdfd;
    72 	struct ioc_read_subchannel info;
    73 
    74 	/* If it doesn't exist, return -1 */
    75 	if ( stat(drive, stbuf) < 0 ) {
    76 		return(-1);
    77 	}
    78 
    79 	/* If it does exist, verify that it's an available CD-ROM */
    80 	is_cd = 0;
    81 	if ( S_ISCHR(stbuf->st_mode) || S_ISBLK(stbuf->st_mode) ) {
    82 		cdfd = open(drive, (O_RDONLY|O_EXCL|O_NONBLOCK), 0);
    83 		if ( cdfd >= 0 ) {
    84 			info.address_format = CD_MSF_FORMAT;
    85 			info.data_format = CD_CURRENT_POSITION;
    86 			info.data_len = 0;
    87 			info.data = NULL;
    88 			/* Under Linux, EIO occurs when a disk is not present.
    89 			   This isn't 100% reliable, so we use the USE_MNTENT
    90 			   code above instead.
    91 			 */
    92 			if ( (ioctl(cdfd, CDIOCREADSUBCHANNEL, &info) == 0) ||
    93 						ERRNO_TRAYEMPTY(errno) ) {
    94 				is_cd = 1;
    95 			}
    96 			close(cdfd);
    97 		}
    98 	}
    99 	return(is_cd);
   100 }
   101 
   102 /* Add a CD-ROM drive to our list of valid drives */
   103 static void AddDrive(char *drive, struct stat *stbuf)
   104 {
   105 	int i;
   106 
   107 	if ( SDL_numcds < MAX_DRIVES ) {
   108 		/* Check to make sure it's not already in our list.
   109 	 	   This can happen when we see a drive via symbolic link.
   110 		 */
   111 		for ( i=0; i<SDL_numcds; ++i ) {
   112 			if ( stbuf->st_rdev == SDL_cdmode[i] ) {
   113 #ifdef DEBUG_CDROM
   114   fprintf(stderr, "Duplicate drive detected: %s == %s\n", drive, SDL_cdlist[i]);
   115 #endif
   116 				return;
   117 			}
   118 		}
   119 
   120 		/* Add this drive to our list */
   121 		i = SDL_numcds;
   122 		SDL_cdlist[i] = (char *)malloc(strlen(drive)+1);
   123 		if ( SDL_cdlist[i] == NULL ) {
   124 			SDL_OutOfMemory();
   125 			return;
   126 		}
   127 		strcpy(SDL_cdlist[i], drive);
   128 		SDL_cdmode[i] = stbuf->st_rdev;
   129 		++SDL_numcds;
   130 #ifdef DEBUG_CDROM
   131   fprintf(stderr, "Added CD-ROM drive: %s\n", drive);
   132 #endif
   133 	}
   134 }
   135 
   136 int  SDL_SYS_CDInit(void)
   137 {
   138 	/* checklist: /dev/cdrom,/dev/cd?c /dev/acd?c
   139 			/dev/matcd?c /dev/mcd?c /dev/scd?c */
   140 	static char *checklist[] = {
   141 	"cdrom", "?0 cd?", "?0 acd?", "?0 matcd?", "?0 mcd?", "?0 scd?",NULL
   142 	};
   143 	char *SDLcdrom;
   144 	int i, j, exists;
   145 	char drive[32];
   146 	struct stat stbuf;
   147 
   148 	/* Fill in our driver capabilities */
   149 	SDL_CDcaps.Name = SDL_SYS_CDName;
   150 	SDL_CDcaps.Open = SDL_SYS_CDOpen;
   151 	SDL_CDcaps.GetTOC = SDL_SYS_CDGetTOC;
   152 	SDL_CDcaps.Status = SDL_SYS_CDStatus;
   153 	SDL_CDcaps.Play = SDL_SYS_CDPlay;
   154 	SDL_CDcaps.Pause = SDL_SYS_CDPause;
   155 	SDL_CDcaps.Resume = SDL_SYS_CDResume;
   156 	SDL_CDcaps.Stop = SDL_SYS_CDStop;
   157 	SDL_CDcaps.Eject = SDL_SYS_CDEject;
   158 	SDL_CDcaps.Close = SDL_SYS_CDClose;
   159 
   160 	/* Look in the environment for our CD-ROM drive list */
   161 	SDLcdrom = getenv("SDL_CDROM");	/* ':' separated list of devices */
   162 	if ( SDLcdrom != NULL ) {
   163 		char *cdpath, *delim;
   164 		cdpath = malloc(strlen(SDLcdrom)+1);
   165 		if ( cdpath != NULL ) {
   166 			strcpy(cdpath, SDLcdrom);
   167 			SDLcdrom = cdpath;
   168 			do {
   169 				delim = strchr(SDLcdrom, ':');
   170 				if ( delim ) {
   171 					*delim++ = '\0';
   172 				}
   173 				if ( CheckDrive(SDLcdrom, &stbuf) > 0 ) {
   174 					AddDrive(SDLcdrom, &stbuf);
   175 				}
   176 				if ( delim ) {
   177 					SDLcdrom = delim;
   178 				} else {
   179 					SDLcdrom = NULL;
   180 				}
   181 			} while ( SDLcdrom );
   182 			free(cdpath);
   183 		}
   184 
   185 		/* If we found our drives, there's nothing left to do */
   186 		if ( SDL_numcds > 0 ) {
   187 			return(0);
   188 		}
   189 	}
   190 
   191 	/* Scan the system for CD-ROM drives */
   192 	for ( i=0; checklist[i]; ++i ) {
   193 		if ( checklist[i][0] == '?' ) {
   194 			char *insert;
   195 			exists = 1;
   196 			for ( j=checklist[i][1]; exists; ++j ) {
   197 				sprintf(drive, "/dev/%sc", &checklist[i][3]);
   198 				insert = strchr(drive, '?');
   199 				if ( insert != NULL ) {
   200 					*insert = j;
   201 				}
   202 				switch (CheckDrive(drive, &stbuf)) {
   203 					/* Drive exists and is a CD-ROM */
   204 					case 1:
   205 						AddDrive(drive, &stbuf);
   206 						break;
   207 					/* Drive exists, but isn't a CD-ROM */
   208 					case 0:
   209 						break;
   210 					/* Drive doesn't exist */
   211 					case -1:
   212 						exists = 0;
   213 						break;
   214 				}
   215 			}
   216 		} else {
   217 			sprintf(drive, "/dev/%s", checklist[i]);
   218 			if ( CheckDrive(drive, &stbuf) > 0 ) {
   219 				AddDrive(drive, &stbuf);
   220 			}
   221 		}
   222 	}
   223 	return(0);
   224 }
   225 
   226 /* General ioctl() CD-ROM command function */
   227 static int SDL_SYS_CDioctl(int id, int command, void *arg)
   228 {
   229 	int retval;
   230 
   231 	retval = ioctl(id, command, arg);
   232 	if ( retval < 0 ) {
   233 		SDL_SetError("ioctl() error: %s", strerror(errno));
   234 	}
   235 	return(retval);
   236 }
   237 
   238 static const char *SDL_SYS_CDName(int drive)
   239 {
   240 	return(SDL_cdlist[drive]);
   241 }
   242 
   243 static int SDL_SYS_CDOpen(int drive)
   244 {
   245 	return(open(SDL_cdlist[drive], (O_RDONLY|O_EXCL|O_NONBLOCK), 0));
   246 }
   247 
   248 static int SDL_SYS_CDGetTOC(SDL_CD *cdrom)
   249 {
   250 	struct ioc_toc_header toc;
   251 	int i, okay;
   252 	struct ioc_read_toc_entry entry;
   253 	struct cd_toc_entry data;
   254 
   255 	okay = 0;
   256 	if ( SDL_SYS_CDioctl(cdrom->id, CDIOREADTOCHEADER, &toc) == 0 ) {
   257 		cdrom->numtracks = toc.ending_track-toc.starting_track+1;
   258 		if ( cdrom->numtracks > SDL_MAX_TRACKS ) {
   259 			cdrom->numtracks = SDL_MAX_TRACKS;
   260 		}
   261 		/* Read all the track TOC entries */
   262 		for ( i=0; i<=cdrom->numtracks; ++i ) {
   263 			if ( i == cdrom->numtracks ) {
   264 				cdrom->track[i].id = 0xAA; /* CDROM_LEADOUT */
   265 			} else {
   266 				cdrom->track[i].id = toc.starting_track+i;
   267 			}
   268 			entry.starting_track = cdrom->track[i].id;
   269 			entry.address_format = CD_MSF_FORMAT;
   270 			entry.data_len = sizeof(data);
   271 			entry.data = &data;
   272 			if ( SDL_SYS_CDioctl(cdrom->id, CDIOREADTOCENTRYS,
   273 								&entry) < 0 ) {
   274 				break;
   275 			} else {
   276 				cdrom->track[i].type = data.control;
   277 				cdrom->track[i].offset = MSF_TO_FRAMES(
   278 						data.addr.msf.minute,
   279 						data.addr.msf.second,
   280 						data.addr.msf.frame);
   281 				cdrom->track[i].length = 0;
   282 				if ( i > 0 ) {
   283 					cdrom->track[i-1].length =
   284 						cdrom->track[i].offset-
   285 						cdrom->track[i-1].offset;
   286 				}
   287 			}
   288 		}
   289 		if ( i == (cdrom->numtracks+1) ) {
   290 			okay = 1;
   291 		}
   292 	}
   293 	return(okay ? 0 : -1);
   294 }
   295 
   296 /* Get CD-ROM status */
   297 static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position)
   298 {
   299 	CDstatus status;
   300 	struct ioc_toc_header toc;
   301 	struct ioc_read_subchannel info;
   302 	struct cd_sub_channel_info data;
   303 
   304 	info.address_format = CD_MSF_FORMAT;
   305 	info.data_format = CD_CURRENT_POSITION;
   306 	info.track = 0;
   307 	info.data_len = sizeof(data);
   308 	info.data = &data;
   309 	if ( ioctl(cdrom->id, CDIOCREADSUBCHANNEL, &info) < 0 ) {
   310 		if ( ERRNO_TRAYEMPTY(errno) ) {
   311 			status = CD_TRAYEMPTY;
   312 		} else {
   313 			status = CD_ERROR;
   314 		}
   315 	} else {
   316 		switch (data.header.audio_status) {
   317 			case CD_AS_AUDIO_INVALID:
   318 			case CD_AS_NO_STATUS:
   319 				/* Try to determine if there's a CD available */
   320 				if (ioctl(cdrom->id,CDIOREADTOCHEADER,&toc)==0)
   321 					status = CD_STOPPED;
   322 				else
   323 					status = CD_TRAYEMPTY;
   324 				break;
   325 			case CD_AS_PLAY_COMPLETED:
   326 				status = CD_STOPPED;
   327 				break;
   328 			case CD_AS_PLAY_IN_PROGRESS:
   329 				status = CD_PLAYING;
   330 				break;
   331 			case CD_AS_PLAY_PAUSED:
   332 				status = CD_PAUSED;
   333 				break;
   334 			default:
   335 				status = CD_ERROR;
   336 				break;
   337 		}
   338 	}
   339 	if ( position ) {
   340 		if ( status == CD_PLAYING || (status == CD_PAUSED) ) {
   341 			*position = MSF_TO_FRAMES(
   342 					data.what.position.absaddr.msf.minute,
   343 					data.what.position.absaddr.msf.second,
   344 					data.what.position.absaddr.msf.frame);
   345 		} else {
   346 			*position = 0;
   347 		}
   348 	}
   349 	return(status);
   350 }
   351 
   352 /* Start play */
   353 static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length)
   354 {
   355 	struct ioc_play_msf playtime;
   356 
   357 	FRAMES_TO_MSF(start,
   358 		&playtime.start_m, &playtime.start_s, &playtime.start_f);
   359 	FRAMES_TO_MSF(start+length,
   360 		&playtime.end_m, &playtime.end_s, &playtime.end_f);
   361 #ifdef DEBUG_CDROM
   362   fprintf(stderr, "Trying to play from %d:%d:%d to %d:%d:%d\n",
   363 	playtime.cdmsf_min0, playtime.cdmsf_sec0, playtime.cdmsf_frame0,
   364 	playtime.cdmsf_min1, playtime.cdmsf_sec1, playtime.cdmsf_frame1);
   365 #endif
   366 	ioctl(cdrom->id, CDIOCSTART, 0);
   367 	return(SDL_SYS_CDioctl(cdrom->id, CDIOCPLAYMSF, &playtime));
   368 }
   369 
   370 /* Pause play */
   371 static int SDL_SYS_CDPause(SDL_CD *cdrom)
   372 {
   373 	return(SDL_SYS_CDioctl(cdrom->id, CDIOCPAUSE, 0));
   374 }
   375 
   376 /* Resume play */
   377 static int SDL_SYS_CDResume(SDL_CD *cdrom)
   378 {
   379 	return(SDL_SYS_CDioctl(cdrom->id, CDIOCRESUME, 0));
   380 }
   381 
   382 /* Stop play */
   383 static int SDL_SYS_CDStop(SDL_CD *cdrom)
   384 {
   385 	return(SDL_SYS_CDioctl(cdrom->id, CDIOCSTOP, 0));
   386 }
   387 
   388 /* Eject the CD-ROM */
   389 static int SDL_SYS_CDEject(SDL_CD *cdrom)
   390 {
   391 	return(SDL_SYS_CDioctl(cdrom->id, CDIOCEJECT, 0));
   392 }
   393 
   394 /* Close the CD-ROM handle */
   395 static void SDL_SYS_CDClose(SDL_CD *cdrom)
   396 {
   397 	close(cdrom->id);
   398 }
   399 
   400 void SDL_SYS_CDQuit(void)
   401 {
   402 	int i;
   403 
   404 	if ( SDL_numcds > 0 ) {
   405 		for ( i=0; i<SDL_numcds; ++i ) {
   406 			free(SDL_cdlist[i]);
   407 		}
   408 		SDL_numcds = 0;
   409 	}
   410 }
   411