src/cdrom/osf/SDL_syscdrom.c
author Sam Lantinga <slouken@libsdl.org>
Tue, 22 Jul 2003 14:01:21 +0000
changeset 654 e92bcf2573cb
child 873 89666943c598
permissions -rw-r--r--
Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
     1 /*
     2     Tru64 audio module for SDL (Simple DirectMedia Layer)
     3     Copyright (C) 2003
     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 
    20 */
    21 
    22 
    23 /* Functions for system-level CD-ROM audio control */
    24 
    25 //#define DEBUG_CDROM 1
    26 
    27 #include <sys/types.h>
    28 #include <sys/stat.h>
    29 #include <fcntl.h>
    30 #include <io/cam/cdrom.h>
    31 #include <io/cam/rzdisk.h>
    32 #include <io/common/devgetinfo.h>
    33 #include <alloca.h>
    34 #include <stdlib.h>
    35 #include <stdio.h>
    36 #include <string.h>
    37 #include <errno.h>
    38 
    39 #include "SDL_error.h"
    40 #include "SDL_cdrom.h"
    41 #include "SDL_syscdrom.h"
    42 
    43 /* The maximum number of CD-ROM drives we'll detect */
    44 #define MAX_DRIVES 16
    45 
    46 /* A list of available CD-ROM drives */
    47 static char *SDL_cdlist[MAX_DRIVES];
    48 static dev_t SDL_cdmode[MAX_DRIVES];
    49 
    50 /* The system-dependent CD control functions */
    51 static const char *SDL_SYS_CDName(int drive);
    52 static int         SDL_SYS_CDOpen(int drive);
    53 static int         SDL_SYS_CDGetTOC(SDL_CD *cdrom);
    54 static CDstatus    SDL_SYS_CDStatus(SDL_CD *cdrom, int *position);
    55 static int         SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length);
    56 static int         SDL_SYS_CDPause(SDL_CD *cdrom);
    57 static int         SDL_SYS_CDResume(SDL_CD *cdrom);
    58 static int         SDL_SYS_CDStop(SDL_CD *cdrom);
    59 static int         SDL_SYS_CDEject(SDL_CD *cdrom);
    60 static void        SDL_SYS_CDClose(SDL_CD *cdrom);
    61 
    62 /* Some ioctl() errno values which occur when the tray is empty */
    63 #define ERRNO_TRAYEMPTY(errno)	\
    64     ((errno == EIO) || (errno == ENOENT) || (errno == EINVAL))
    65 
    66 /* Check a drive to see if it is a CD-ROM */
    67 /* Caution!! Not tested. */ 
    68 static int CheckDrive(char *drive, struct stat *stbuf)
    69 {
    70     int is_cd, cdfd;
    71     struct cd_sub_channel info;
    72 
    73     /* If it doesn't exist, return -1 */
    74     if ( stat(drive, stbuf) < 0 ) {
    75 	return(-1);
    76     }
    77 
    78     /* If it does exist, verify that it's an available CD-ROM */
    79     is_cd = 0;
    80     if ( S_ISCHR(stbuf->st_mode) || S_ISBLK(stbuf->st_mode) ) {
    81 	cdfd = open(drive, (O_RDWR|O_NDELAY), 0);
    82 	if ( cdfd >= 0 ) {
    83 	    info.sch_address_format = CDROM_MSF_FORMAT;
    84 	    info.sch_data_format = CDROM_CURRENT_POSITION;
    85 	    info.sch_alloc_length = 0;
    86 	    info.sch_track_number = 0;
    87 	    info.sch_buffer = NULL;
    88 	    /*
    89 	     *
    90 	     * Under Linux, EIO occurs when a disk is not present.
    91 	     * This isn't 100% reliable, so we use the USE_MNTENT
    92 	     * code above instead.
    93 	     *
    94 	     */
    95 	    if ( (ioctl(cdfd, CDROM_READ_SUBCHANNEL, &info) == 0) ||
    96 		    ERRNO_TRAYEMPTY(errno) ) {
    97 		is_cd = 1;
    98 	    }
    99 
   100 	    close(cdfd);
   101 	}
   102     }
   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 	 * /
   117 	for ( i=0; i<SDL_numcds; ++i ) {
   118 	    if ( stbuf->st_rdev == SDL_cdmode[i] ) {
   119 #ifdef DEBUG_CDROM
   120   fprintf(stderr, "Duplicate drive detected: %s == %s\n", drive, SDL_cdlist[i]);
   121 #endif
   122 	    return;
   123 	    }
   124 	}
   125 
   126 	/* Add this drive to our list */
   127 	i = SDL_numcds;
   128 	SDL_cdlist[i] = (char *)malloc(strlen(drive)+1);
   129 	if ( SDL_cdlist[i] == NULL ) {
   130 	    SDL_OutOfMemory();
   131 	    return;
   132 	}
   133 
   134 	strcpy(SDL_cdlist[i], drive);
   135 	SDL_cdmode[i] = stbuf->st_rdev;
   136 	++SDL_numcds;
   137 #ifdef DEBUG_CDROM
   138   fprintf(stderr, "Added CD-ROM drive: %s\n", drive);
   139 #endif
   140     }
   141 }
   142 
   143 int  SDL_SYS_CDInit(void)
   144 {
   145     /* checklist: /dev/cdrom,/dev/cd?c /dev/acd?c
   146      * /dev/matcd?c /dev/mcd?c /dev/scd?c
   147      *
   148      */
   149     static char *checklist[] = {
   150 	"?0 rdisk/cdrom?",NULL};
   151     char drive[32];
   152     char *SDLcdrom;
   153     int i, j, exists;
   154     struct stat stbuf;
   155 
   156     /* Fill in our driver capabilities */
   157     SDL_CDcaps.Name   = SDL_SYS_CDName;
   158     SDL_CDcaps.Open   = SDL_SYS_CDOpen;
   159     SDL_CDcaps.GetTOC = SDL_SYS_CDGetTOC;
   160     SDL_CDcaps.Status = SDL_SYS_CDStatus;
   161     SDL_CDcaps.Play   = SDL_SYS_CDPlay;
   162     SDL_CDcaps.Pause  = SDL_SYS_CDPause;
   163     SDL_CDcaps.Resume = SDL_SYS_CDResume;
   164     SDL_CDcaps.Stop   = SDL_SYS_CDStop;
   165     SDL_CDcaps.Eject  = SDL_SYS_CDEject;
   166     SDL_CDcaps.Close  = SDL_SYS_CDClose;
   167 
   168 
   169     /* Look in the environment for our CD-ROM drive list */
   170     SDLcdrom = getenv("SDL_CDROM");	/* ':' separated list of devices */
   171     if ( SDLcdrom != NULL ) {
   172 	char *cdpath, *delim;
   173 	cdpath = malloc(strlen(SDLcdrom)+1);
   174 	if ( cdpath != NULL ) {
   175 	    strcpy(cdpath, SDLcdrom);
   176 	    SDLcdrom = cdpath;
   177 	    do {
   178 		delim = strchr(SDLcdrom, ':');
   179 		if ( delim ) {
   180 		    *delim++ = '\0';
   181 		}
   182 		if ( CheckDrive(SDLcdrom, &stbuf) > 0 ) {
   183 		    AddDrive(SDLcdrom, &stbuf);
   184 		}
   185 		if ( delim ) {
   186 		    SDLcdrom = delim;
   187 		} else {
   188 		    SDLcdrom = NULL;
   189 		}
   190 	    } while ( SDLcdrom );
   191 	    free(cdpath);
   192 	}
   193 
   194 	/* If we found our drives, there's nothing left to do */
   195 	if ( SDL_numcds > 0 ) {
   196 	    return(0);
   197 	}
   198     }
   199     /* Scan the system for CD-ROM drives */
   200     for ( i=0; checklist[i]; ++i ) {
   201 	if ( checklist[i][0] == '?' ) {
   202 	    char *insert;
   203 	    exists = 1;
   204 	    for ( j=checklist[i][1]; exists; ++j ) {
   205 		sprintf(drive, "/dev/%sc", &checklist[i][3]);
   206 		insert = strchr(drive, '?');
   207 		if ( insert != NULL ) {
   208 		    *insert = j;
   209 		}
   210 		switch (CheckDrive(drive, &stbuf)) {
   211 		    /* Drive exists and is a CD-ROM */
   212 		    case 1:
   213 			AddDrive(drive, &stbuf);
   214 			break;
   215 			/* Drive exists, but isn't a CD-ROM */
   216 		    case 0:
   217 			break;
   218 			/* Drive doesn't exist */
   219 		    case -1:
   220 			exists = 0;
   221 			break;
   222 		}
   223 	    }
   224 	} else {
   225 	    sprintf(drive, "/dev/%s", checklist[i]);
   226 	    if ( CheckDrive(drive, &stbuf) > 0 ) {
   227 		AddDrive(drive, &stbuf);
   228 	    }
   229 	}
   230     }
   231 /*
   232     SDLcdrom=malloc(sizeof(char) * 32);
   233     strcpy(SDLcdrom,"/dev/rdisk/cdrom0c");
   234     SDL_cdlist[0] = SDLcdrom;
   235     stat(SDLcdrom, &stbuf);
   236     SDL_cdmode[0] = stbuf.st_rdev;
   237     SDL_numcds = 1;
   238  */
   239     return (0);
   240 }
   241 
   242 static const char *SDL_SYS_CDName(int drive)
   243 {
   244     return(SDL_cdlist[drive]);
   245 }
   246 
   247 static int SDL_SYS_CDOpen(int drive)
   248 {
   249     /* O_RDWR: To use ioctl(fd, SCSI_STOP_UNIT) */
   250     return(open(SDL_cdlist[drive], (O_RDWR|O_NDELAY), 0));
   251 }
   252 
   253 static int SDL_SYS_CDGetTOC(SDL_CD *cdrom)
   254 {
   255     struct cd_toc                  toc;
   256     struct cd_toc_header           hdr;
   257     struct cd_toc_entry          *cdte;
   258     int i;
   259     int okay = 0;
   260     if ( ioctl(cdrom->id, CDROM_TOC_HEADER, &hdr) ) {
   261 	fprintf(stderr,"ioctl error CDROM_TOC_HEADER\n");
   262 	return -1;
   263     }
   264     cdrom->numtracks = hdr.th_ending_track - hdr.th_starting_track + 1;
   265     if ( cdrom->numtracks > SDL_MAX_TRACKS ) {
   266 	cdrom->numtracks = SDL_MAX_TRACKS;
   267     }
   268 #ifdef DEBUG_CDROM
   269   fprintf(stderr,"hdr.th_data_len1 = %d\n", hdr.th_data_len1);
   270   fprintf(stderr,"hdr.th_data_len0 = %d\n", hdr.th_data_len0);
   271   fprintf(stderr,"hdr.th_starting_track = %d\n", hdr.th_starting_track);
   272   fprintf(stderr,"hdr.th_ending_track = %d\n", hdr.th_ending_track);
   273   fprintf(stderr,"cdrom->numtracks = %d\n", cdrom->numtracks);
   274 #endif
   275     toc.toc_address_format = CDROM_LBA_FORMAT;
   276     toc.toc_starting_track = 0;
   277     toc.toc_alloc_length = (hdr.th_data_len1 << 8) +
   278 			    hdr.th_data_len0 + sizeof(hdr);
   279     if ( (toc.toc_buffer = alloca(toc.toc_alloc_length)) == NULL) {
   280 	fprintf(stderr,"cannot allocate toc.toc_buffer\n");
   281 	return -1;
   282     }
   283 
   284     bzero (toc.toc_buffer, toc.toc_alloc_length);
   285     if (ioctl(cdrom->id, CDROM_TOC_ENTRYS, &toc)) {
   286 	fprintf(stderr,"ioctl error CDROM_TOC_ENTRYS\n");
   287 	return -1;
   288     }
   289 
   290     (char *)cdte = toc.toc_buffer + sizeof(hdr);
   291 	for (i=0; i <= cdrom->numtracks; ++i) {
   292 	    if (i == cdrom->numtracks ) {
   293 		cdrom->track[i].id = 0xAA;;
   294 	    } else {
   295 		cdrom->track[i].id = hdr.th_starting_track + i;
   296 	    }
   297 
   298 	    cdrom->track[i].type =
   299 		cdte[i].te_control & CDROM_DATA_TRACK;
   300 	    cdrom->track[i].offset =
   301 		cdte[i].te_absaddr.lba.addr3 << 24 |
   302 		cdte[i].te_absaddr.lba.addr2 << 16 |
   303 		cdte[i].te_absaddr.lba.addr1 << 8  |
   304 		cdte[i].te_absaddr.lba.addr0;
   305 	    cdrom->track[i].length = 0;
   306 	    if ( i > 0 ) {
   307 		cdrom->track[i - 1].length =
   308 		    cdrom->track[i].offset -
   309 		    cdrom->track[i - 1].offset;
   310 	    }
   311 	}
   312 #ifdef DEBUG_CDROM
   313   for (i = 0; i <= cdrom->numtracks; i++) {
   314     fprintf(stderr,"toc_entry[%d].te_track_number = %d\n",
   315 	    i,cdte[i].te_track_number);
   316     fprintf(stderr,"cdrom->track[%d].id = %d\n", i,cdrom->track[i].id);
   317     fprintf(stderr,"cdrom->track[%d].type = %x\n", i,cdrom->track[i].type);
   318     fprintf(stderr,"cdrom->track[%d].offset = %d\n", i,cdrom->track[i].offset);
   319     fprintf(stderr,"cdrom->track[%d].length = %d\n", i,cdrom->track[i].length);
   320   }
   321 #endif
   322     if ( i == (cdrom->numtracks+1) ) {
   323 	okay = 1;
   324     }
   325 
   326     return(okay ? 0 : -1);
   327 }
   328 
   329 /* Get CD-ROM status */
   330 static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position)
   331 {
   332     CDstatus                     status;
   333     struct cd_sub_channel            sc;
   334     struct cd_subc_channel_data     scd;
   335 
   336     sc.sch_address_format = CDROM_LBA_FORMAT;
   337     sc.sch_data_format    = CDROM_CURRENT_POSITION;
   338     sc.sch_track_number   = 0;
   339     sc.sch_alloc_length   = sizeof(scd);
   340     sc.sch_buffer         = (caddr_t)&scd;
   341     if ( ioctl(cdrom->id, CDROM_READ_SUBCHANNEL, &sc) ) {
   342 	status = CD_ERROR;
   343 	fprintf(stderr,"ioctl error CDROM_READ_SUBCHANNEL \n");
   344     } else {
   345 	switch (scd.scd_header.sh_audio_status) {
   346 	    case AS_AUDIO_INVALID:
   347 		status = CD_STOPPED;
   348 		break;
   349 	    case AS_PLAY_IN_PROGRESS:
   350 		status = CD_PLAYING;
   351 		break;
   352 	    case AS_PLAY_PAUSED:
   353 		status = CD_PAUSED;
   354 		break;
   355 	    case AS_PLAY_COMPLETED:
   356 		status = CD_STOPPED;
   357 		break;
   358 	    case AS_PLAY_ERROR:
   359 		status = CD_ERROR;
   360 		break;
   361 	    case AS_NO_STATUS:
   362 		status = CD_STOPPED;
   363 		break;
   364 	    default:
   365 		status = CD_ERROR;
   366 		break;
   367 	}
   368 #ifdef DEBUG_CDROM
   369   fprintf(stderr,"scd.scd_header.sh_audio_status = %x\n",
   370 	scd.scd_header.sh_audio_status);
   371 #endif
   372     }
   373     if (position) {
   374 	if (status == CD_PLAYING || (status == CD_PAUSED) ) {
   375 	    *position =
   376 		scd.scd_position_data.scp_absaddr.lba.addr3 << 24 |
   377 		scd.scd_position_data.scp_absaddr.lba.addr2 << 16 |
   378 		scd.scd_position_data.scp_absaddr.lba.addr1 << 8  |
   379 		scd.scd_position_data.scp_absaddr.lba.addr0;
   380 	} else {
   381 	    *position = 0;
   382 	}
   383     }
   384 
   385     return status;
   386 }
   387 
   388 /* Start play */
   389 static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length)
   390 {
   391 /* Play MSF
   392  *
   393  */
   394     struct cd_play_audio_msf msf;
   395     int end;
   396 
   397     bzero(&msf, sizeof(msf));
   398     end = start +length;
   399     FRAMES_TO_MSF(start,
   400 		  &msf.msf_starting_M_unit,
   401 		  &msf.msf_starting_S_unit,
   402 		  &msf.msf_starting_F_unit);
   403     FRAMES_TO_MSF(end,
   404 		  &msf.msf_ending_M_unit,
   405 		  &msf.msf_ending_S_unit,
   406 		  &msf.msf_ending_F_unit);
   407 
   408     return(ioctl(cdrom->id, CDROM_PLAY_AUDIO_MSF, &msf));
   409 }
   410 
   411 /* Pause play */
   412 static int SDL_SYS_CDPause(SDL_CD *cdrom)
   413 {
   414     return(ioctl(cdrom->id, CDROM_PAUSE_PLAY));
   415 }
   416 
   417 /* Resume play */
   418 static int SDL_SYS_CDResume(SDL_CD *cdrom)
   419 {
   420     return(ioctl(cdrom->id, CDROM_RESUME_PLAY));
   421 }
   422 
   423 /* Stop play */
   424 static int SDL_SYS_CDStop(SDL_CD *cdrom)
   425 {
   426     return(ioctl(cdrom->id, SCSI_STOP_UNIT));
   427 }
   428 
   429 /* Eject the CD-ROM */
   430 static int SDL_SYS_CDEject(SDL_CD *cdrom)
   431 {
   432     return(ioctl(cdrom->id, CDROM_EJECT_CADDY));
   433 }
   434 
   435 /* Close the CD-ROM handle */
   436 static void SDL_SYS_CDClose(SDL_CD *cdrom)
   437 {
   438     close(cdrom->id);
   439 }
   440 
   441 void SDL_SYS_CDQuit(void)
   442 {
   443     int i;
   444 
   445     if ( SDL_numcds > 0 ) {
   446 	for ( i=0; i<SDL_numcds; ++i ) {
   447 	    free(SDL_cdlist[i]);
   448 	}
   449 	SDL_numcds = 0;
   450     }
   451 }
   452 
   453