src/cdrom/qnx/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 <stdlib.h>
    32 #include <sys/stat.h>
    33 #include <sys/ioctl.h>
    34 #include <fcntl.h>
    35 #include <stdio.h>
    36 #include <string.h>
    37 #include <errno.h>
    38 #include <unistd.h>
    39 #include <sys/cdrom.h>
    40 #include <sys/dcmd_cam.h>
    41 
    42 
    43 #include "SDL_error.h"
    44 #include "SDL_cdrom.h"
    45 #include "SDL_syscdrom.h"
    46 
    47 
    48 /* The maximum number of CD-ROM drives we'll detect */
    49 #define MAX_DRIVES	16	
    50 
    51 /* A list of available CD-ROM drives */
    52 static char *SDL_cdlist[MAX_DRIVES];
    53 static dev_t SDL_cdmode[MAX_DRIVES];
    54 
    55 /* The system-dependent CD control functions */
    56 static const char *SDL_SYS_CDName(int drive);
    57 static int SDL_SYS_CDOpen(int drive);
    58 static int SDL_SYS_CDGetTOC(SDL_CD *cdrom);
    59 static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position);
    60 static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length);
    61 static int SDL_SYS_CDPause(SDL_CD *cdrom);
    62 static int SDL_SYS_CDResume(SDL_CD *cdrom);
    63 static int SDL_SYS_CDStop(SDL_CD *cdrom);
    64 static int SDL_SYS_CDEject(SDL_CD *cdrom);
    65 static void SDL_SYS_CDClose(SDL_CD *cdrom);
    66 
    67 /* Some ioctl() errno values which occur when the tray is empty */
    68 #define ERRNO_TRAYEMPTY(errno)	\
    69 	((errno == EIO) || (errno == ENOENT) || (errno == EINVAL))
    70 
    71 /* Check a drive to see if it is a CD-ROM */
    72 static int CheckDrive(char *drive, char *mnttype, struct stat *stbuf)
    73 {
    74 	int is_cd, cdfd;
    75 	cdrom_subch_data_t 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.subch_command.data_format = CDROM_MSF;
    88 			/* Under Linux, EIO occurs when a disk is not present.
    89 			 */
    90 			if ((devctl(cdfd,DCMD_CAM_CDROMSUBCHNL,&info,sizeof(info),0) == 0) ||
    91 						ERRNO_TRAYEMPTY(errno) )
    92 			{
    93 				is_cd = 1;
    94 			}
    95 			close(cdfd);
    96 		}
    97 	}
    98 	return(is_cd);
    99 }
   100 
   101 /* Add a CD-ROM drive to our list of valid drives */
   102 static void AddDrive(char *drive, struct stat *stbuf)
   103 {
   104 	int i;
   105 
   106 	if ( SDL_numcds < MAX_DRIVES ) {
   107 		/* Check to make sure it's not already in our list.
   108 	 	   This can happen when we see a drive via symbolic link.
   109 		 */
   110 		for ( i=0; i<SDL_numcds; ++i ) {
   111 			if ( stbuf->st_rdev == SDL_cdmode[i] ) {
   112 #ifdef DEBUG_CDROM
   113   fprintf(stderr, "Duplicate drive detected: %s == %s\n", drive, SDL_cdlist[i]);
   114 #endif
   115 				return;
   116 			}
   117 		}
   118 
   119 		/* Add this drive to our list */
   120 		i = SDL_numcds;
   121 		SDL_cdlist[i] = (char *)malloc(strlen(drive)+1);
   122 		if ( SDL_cdlist[i] == NULL ) {
   123 			SDL_OutOfMemory();
   124 			return;
   125 		}
   126 		strcpy(SDL_cdlist[i], drive);
   127 		SDL_cdmode[i] = stbuf->st_rdev;
   128 		++SDL_numcds;
   129 #ifdef DEBUG_CDROM
   130   fprintf(stderr, "Added CD-ROM drive: %s\n", drive);
   131 #endif
   132 	}
   133 }
   134 
   135 int  SDL_SYS_CDInit(void)
   136 {
   137 	/* checklist: /dev/cdrom, /dev/hd?, /dev/scd? /dev/sr? */
   138 	static char *checklist[] = {
   139 		"cdrom", "?0 cd?", "?1 cd?", "?a hd?", "?0 scd?", "?0 sr?", NULL
   140 	};
   141 	char *SDLcdrom;
   142 	int i, j, exists;
   143 	char drive[32];
   144 	struct stat stbuf;
   145 
   146 	/* Fill in our driver capabilities */
   147 	SDL_CDcaps.Name = SDL_SYS_CDName;
   148 	SDL_CDcaps.Open = SDL_SYS_CDOpen;
   149 	SDL_CDcaps.GetTOC = SDL_SYS_CDGetTOC;
   150 	SDL_CDcaps.Status = SDL_SYS_CDStatus;
   151 	SDL_CDcaps.Play = SDL_SYS_CDPlay;
   152 	SDL_CDcaps.Pause = SDL_SYS_CDPause;
   153 	SDL_CDcaps.Resume = SDL_SYS_CDResume;
   154 	SDL_CDcaps.Stop = SDL_SYS_CDStop;
   155 	SDL_CDcaps.Eject = SDL_SYS_CDEject;
   156 	SDL_CDcaps.Close = SDL_SYS_CDClose;
   157 
   158 	/* Look in the environment for our CD-ROM drive list */
   159 	SDLcdrom = getenv("SDL_CDROM");	/* ':' separated list of devices */
   160 	if ( SDLcdrom != NULL ) {
   161 		char *cdpath, *delim;
   162 		cdpath = malloc(strlen(SDLcdrom)+1);
   163 		if ( cdpath != NULL ) {
   164 			strcpy(cdpath, SDLcdrom);
   165 			SDLcdrom = cdpath;
   166 			do {
   167 				delim = strchr(SDLcdrom, ':');
   168 				if ( delim ) {
   169 					*delim++ = '\0';
   170 				}
   171 #ifdef DEBUG_CDROM
   172   fprintf(stderr, "Checking CD-ROM drive from SDL_CDROM: %s\n", SDLcdrom);
   173 #endif
   174 				if ( CheckDrive(SDLcdrom, NULL, &stbuf) > 0 ) {
   175 					AddDrive(SDLcdrom, &stbuf);
   176 				}
   177 				if ( delim ) {
   178 					SDLcdrom = delim;
   179 				} else {
   180 					SDLcdrom = NULL;
   181 				}
   182 			} while ( SDLcdrom );
   183 			free(cdpath);
   184 		}
   185 
   186 		/* If we found our drives, there's nothing left to do */
   187 		if ( SDL_numcds > 0 ) {
   188 			return(0);
   189 		}
   190 	}
   191 
   192 	/* Scan the system for CD-ROM drives */
   193 	for ( i=0; checklist[i]; ++i ) {
   194 		if ( checklist[i][0] == '?' ) {
   195 			char *insert;
   196 			exists = 1;
   197 			for ( j=checklist[i][1]; exists; ++j ) {
   198 				sprintf(drive, "/dev/%s", &checklist[i][3]);
   199 				insert = strchr(drive, '?');
   200 				if ( insert != NULL ) {
   201 					*insert = j;
   202 				}
   203 #ifdef DEBUG_CDROM
   204   fprintf(stderr, "Checking possible CD-ROM drive: %s\n", drive);
   205 #endif
   206 				switch (CheckDrive(drive, NULL, &stbuf)) {
   207 					/* Drive exists and is a CD-ROM */
   208 					case 1:
   209 						AddDrive(drive, &stbuf);
   210 						break;
   211 					/* Drive exists, but isn't a CD-ROM */
   212 					case 0:
   213 						break;
   214 					/* Drive doesn't exist */
   215 					case -1:
   216 						exists = 0;
   217 						break;
   218 				}
   219 			}
   220 		} else {
   221 			sprintf(drive, "/dev/%s", checklist[i]);
   222 #ifdef DEBUG_CDROM
   223   fprintf(stderr, "Checking possible CD-ROM drive: %s\n", drive);
   224 #endif
   225 			if ( CheckDrive(drive, NULL, &stbuf) > 0 ) {
   226 				AddDrive(drive, &stbuf);
   227 			}
   228 		}
   229 	}
   230 	return(0);
   231 }
   232 
   233 static const char *SDL_SYS_CDName(int drive)
   234 {
   235 	return(SDL_cdlist[drive]);
   236 }
   237 
   238 static int SDL_SYS_CDOpen(int drive)
   239 {
   240 	return(open(SDL_cdlist[drive], (O_RDONLY|O_EXCL|O_NONBLOCK), 0));
   241 }
   242 
   243 static int SDL_SYS_CDGetTOC(SDL_CD *cdrom)
   244 {
   245 	cdrom_read_toc_t toc;
   246 	int i, okay;
   247 
   248 	okay = 0;
   249 	if (devctl(cdrom->id, DCMD_CAM_CDROMREADTOC, &toc, sizeof(toc), 0) == 0) {
   250 		cdrom->numtracks = toc.last_track - toc.first_track + 1;
   251 		if ( cdrom->numtracks > SDL_MAX_TRACKS ) {
   252 			cdrom->numtracks = SDL_MAX_TRACKS;
   253 		}
   254 		/* Read all the track TOC entries */
   255 		for ( i=0; i<=cdrom->numtracks; ++i ) {
   256 			if ( i == cdrom->numtracks ) {
   257 				cdrom->track[i].id = CDROM_LEADOUT;
   258 			} else {
   259 #if 0 /* Sam 11/6/00 - an obsolete field? */
   260 				cdrom->track[i].id = toc.cdth_trk0+i;
   261 #else
   262 				cdrom->track[i].id = toc.first_track+i;
   263 #endif
   264 			}
   265 			cdrom->track[i].type = toc.toc_entry[i].control_adr;
   266 			cdrom->track[i].offset = MSF_TO_FRAMES(
   267 						toc.toc_entry[i].addr.msf.minute,
   268 						toc.toc_entry[i].addr.msf.second,
   269 						toc.toc_entry[i].addr.msf.frame);			
   270 			cdrom->track[i].length = 0;
   271 			if ( i > 0 ) {
   272 				cdrom->track[i-1].length =
   273 					cdrom->track[i].offset-
   274 					cdrom->track[i-1].offset;
   275 			}
   276 		}
   277 		if ( i == (cdrom->numtracks+1) ) {
   278 			okay = 1;
   279 		}
   280 	}
   281 	return(okay ? 0 : -1);
   282 }
   283 
   284 /* Get CD-ROM status */
   285 static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position)
   286 {
   287 	CDstatus status;
   288 	cdrom_read_toc_t toc;
   289 	subch_current_position_t info;
   290 
   291 #if 0 /* Sam 11/6/00 - an obsolete field? */
   292 	info.subch_command.data_format = CDROM_SUBCH_CURRENT_POSITION;
   293 	info.subch_command.track_number = 0;
   294 #else
   295 	info.data_format = CDROM_SUBCH_CURRENT_POSITION;
   296 	info.track_number = 0;
   297 #endif
   298 	if (devctl(cdrom->id, DCMD_CAM_CDROMSUBCHNL, &info, sizeof(info), 0) != 0) {
   299 		if ( ERRNO_TRAYEMPTY(errno) ) {
   300 			status = CD_TRAYEMPTY;
   301 		} else {
   302 			status = CD_ERROR;
   303 		}
   304 	} else {
   305 		switch (info.header.audio_status) {
   306 			case CDROM_AUDIO_INVALID:
   307 			case CDROM_AUDIO_NO_STATUS:
   308 				/* Try to determine if there's a CD available */
   309 				if (devctl(cdrom->id, DCMD_CAM_CDROMREADTOC, &toc, sizeof(toc), 0)==0)
   310 					status = CD_STOPPED;
   311 				else
   312 					status = CD_TRAYEMPTY;
   313 				break;
   314 			case CDROM_AUDIO_COMPLETED:
   315 				status = CD_STOPPED;
   316 				break;
   317 			case CDROM_AUDIO_PLAY:
   318 				status = CD_PLAYING;
   319 				break;
   320 			case CDROM_AUDIO_PAUSED:
   321 				/* Workaround buggy CD-ROM drive */
   322 				if ( info.data_format == CDROM_LEADOUT ) {
   323 					status = CD_STOPPED;
   324 				} else {
   325 					status = CD_PAUSED;
   326 				}
   327 				break;
   328 			default:
   329 				status = CD_ERROR;
   330 				break;
   331 		}
   332 	}
   333 	if ( position ) {
   334 		if ( status == CD_PLAYING || (status == CD_PAUSED) ) {
   335 			*position = MSF_TO_FRAMES(
   336 					info.addr.msf.minute,
   337 					info.addr.msf.second,
   338 					info.addr.msf.frame);
   339 		} else {
   340 			*position = 0;
   341 		}
   342 	}
   343 	return(status);
   344 }
   345 
   346 /* Start play */
   347 static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length)
   348 {
   349 	cdrom_playmsf_t playtime;
   350 
   351 	FRAMES_TO_MSF(start,
   352 	   &playtime.start_minute, &playtime.start_second, &playtime.start_frame);
   353 	FRAMES_TO_MSF(start+length,
   354 	   &playtime.end_minute, &playtime.end_second, &playtime.end_frame);
   355 #ifdef DEBUG_CDROM
   356   fprintf(stderr, "Trying to play from %d:%d:%d to %d:%d:%d\n",
   357 	playtime.start_minute, playtime.start_second, playtime.start_frame,
   358 	playtime.end_minute, playtime.end_second, playtime.end_frame);
   359 #endif
   360 	return(devctl(cdrom->id, DCMD_CAM_CDROMPLAYMSF, &playtime, sizeof(playtime), 0));
   361 }
   362 
   363 /* Pause play */
   364 static int SDL_SYS_CDPause(SDL_CD *cdrom)
   365 {
   366 	return(devctl(cdrom->id, DCMD_CAM_CDROMPAUSE, NULL, 0, 0));
   367 }
   368 
   369 /* Resume play */
   370 static int SDL_SYS_CDResume(SDL_CD *cdrom)
   371 {
   372 	return(devctl(cdrom->id, DCMD_CAM_CDROMRESUME, NULL, 0, 0));
   373 }
   374 
   375 /* Stop play */
   376 static int SDL_SYS_CDStop(SDL_CD *cdrom)
   377 {
   378 	return(devctl(cdrom->id, DCMD_CAM_CDROMSTOP, NULL, 0, 0));
   379 }
   380 
   381 /* Eject the CD-ROM */
   382 static int SDL_SYS_CDEject(SDL_CD *cdrom)
   383 {
   384 	return(devctl(cdrom->id, DCMD_CAM_EJECT_MEDIA, NULL, 0, 0));
   385 }
   386 
   387 /* Close the CD-ROM handle */
   388 static void SDL_SYS_CDClose(SDL_CD *cdrom)
   389 {
   390 	close(cdrom->id);
   391 }
   392 
   393 void SDL_SYS_CDQuit(void)
   394 {
   395 	int i;
   396 
   397 	if ( SDL_numcds > 0 ) {
   398 		for ( i=0; i<SDL_numcds; ++i ) {
   399 			free(SDL_cdlist[i]);
   400 		}
   401 		SDL_numcds = 0;
   402 	}
   403 }
   404