2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997-2009 Sam Lantinga
5 This library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
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 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with this library; if not, write to the Free Software
17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "SDL_config.h"
27 * Functions for system-level CD-ROM audio control for BSD/OS 4.x
28 * This started life out as a copy of the freebsd/SDL_cdrom.c file but was
29 * heavily modified. Works for standard (MMC) SCSI and ATAPI CDrom drives.
31 * Steven Schultz - sms@to.gd-es.com
34 #include <sys/types.h>
39 #include <sys/ioctl.h>
40 #include </sys/dev/scsi/scsi.h>
41 #include </sys/dev/scsi/scsi_ioctl.h>
43 #include "SDL_cdrom.h"
44 #include "../SDL_syscdrom.h"
47 * The msf_to_frame and frame_to_msf were yanked from libcdrom and inlined
48 * here so that -lcdrom doesn't have to be dragged in for something so simple.
51 #define FRAMES_PER_SECOND 75
52 #define FRAMES_PER_MINUTE (FRAMES_PER_SECOND * 60)
55 msf_to_frame(int minute, int second, int frame)
57 return(minute * FRAMES_PER_MINUTE + second * FRAMES_PER_SECOND + frame);
61 frame_to_msf(int frame, int *minp, int *secp, int *framep)
63 *minp = frame / FRAMES_PER_MINUTE;
64 *secp = (frame % FRAMES_PER_MINUTE) / FRAMES_PER_SECOND;
65 *framep = frame % FRAMES_PER_SECOND;
68 /* The maximum number of CD-ROM drives we'll detect */
71 /* A list of available CD-ROM drives */
72 static char *SDL_cdlist[MAX_DRIVES];
73 static dev_t SDL_cdmode[MAX_DRIVES];
75 /* The system-dependent CD control functions */
76 static const char *SDL_SYS_CDName(int drive);
77 static int SDL_SYS_CDOpen(int drive);
78 static int SDL_SYS_CDGetTOC(SDL_CD *cdrom);
79 static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position);
80 static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length);
81 static int SDL_SYS_CDPause(SDL_CD *cdrom);
82 static int SDL_SYS_CDResume(SDL_CD *cdrom);
83 static int SDL_SYS_CDStop(SDL_CD *cdrom);
84 static int SDL_SYS_CDEject(SDL_CD *cdrom);
85 static void SDL_SYS_CDClose(SDL_CD *cdrom);
87 typedef struct scsi_cdb cdb_t;
89 static int scsi_cmd(int fd,
95 struct scsi_user_cdb *sus)
99 struct scsi_user_cdb suc;
102 if (!cdb) return(-1);
103 if (rw != SUC_READ && rw != SUC_WRITE) return(-1);
106 suc.suc_cdblen = cdblen;
107 bcopy(cdb, suc.suc_cdb, cdblen);
108 suc.suc_datalen = datalen;
110 suc.suc_timeout = 10; /* 10 secs max for TUR or SENSE */
111 if (ioctl(fd, SCSIRAWCDB, &suc) == -1)
113 scsistatus = suc.suc_sus.sus_status;
114 cp = suc.suc_sus.sus_sense;
117 * If a place to copy the sense data back to has been provided then the
118 * caller is responsible for checking the errors and printing any information
119 * out if the status was not successful.
121 if (scsistatus != 0 && !sus)
123 fprintf(stderr,"scsistatus = %x cmd = %x\n",
125 fprintf(stderr, "sense %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x\n",
126 cp[0], cp[1], cp[2], cp[3], cp[4], cp[5],
127 cp[6], cp[7], cp[8], cp[9], cp[10], cp[11],
128 cp[12], cp[13], cp[14], cp[15]);
132 bcopy(&suc, sus, sizeof (struct scsi_user_cdb));
134 return(1); /* Return non-zero for unsuccessful status */
138 /* request vendor brand and model */
139 unsigned char *Inquiry(int fd)
141 static struct scsi_cdb6 cdb =
148 static unsigned char Inqbuffer[56];
150 if (scsi_cmd(fd, (cdb_t *)&cdb, 6, SUC_READ, Inqbuffer,
151 sizeof(Inqbuffer), 0))
156 #define ADD_SENSECODE 12
157 #define ADD_SC_QUALIFIER 13
159 int TestForMedium(int fd)
162 struct scsi_user_cdb sus;
163 static struct scsi_cdb6 cdb =
165 CMD_TEST_UNIT_READY, /* command */
173 again: sts = scsi_cmd(fd, (cdb_t *)&cdb, 6, SUC_READ, 0, 0, &sus);
174 asc = sus.suc_sus.sus_sense[ADD_SENSECODE];
175 ascq = sus.suc_sus.sus_sense[ADD_SC_QUALIFIER];
176 if (asc == 0x3a && ascq == 0x0) /* no medium */
178 if (asc == 0x28 && ascq == 0x0) /* medium changed */
180 if (asc == 0x4 && ascq == 0x1 ) /* coming ready */
188 /* Check a drive to see if it is a CD-ROM */
189 static int CheckDrive(char *drive, struct stat *stbuf)
194 /* If it doesn't exist, return -1 */
195 if ( stat(drive, stbuf) < 0 ) {
199 /* If it does exist, verify that it's an available CD-ROM */
200 cdfd = open(drive, (O_RDONLY|O_EXCL|O_NONBLOCK), 0);
210 /* Add a CD-ROM drive to our list of valid drives */
211 static void AddDrive(char *drive, struct stat *stbuf)
215 if ( SDL_numcds < MAX_DRIVES ) {
216 /* Check to make sure it's not already in our list.
217 This can happen when we see a drive via symbolic link.
219 for ( i=0; i<SDL_numcds; ++i ) {
220 if ( stbuf->st_rdev == SDL_cdmode[i] ) {
222 fprintf(stderr, "Duplicate drive detected: %s == %s\n", drive, SDL_cdlist[i]);
228 /* Add this drive to our list */
230 SDL_cdlist[i] = SDL_strdup(drive);
231 if ( SDL_cdlist[i] == NULL ) {
235 SDL_cdmode[i] = stbuf->st_rdev;
238 fprintf(stderr, "Added CD-ROM drive: %s\n", drive);
243 int SDL_SYS_CDInit(void)
245 /* checklist: /dev/rsr?c */
246 static char *checklist[] = {
254 /* Fill in our driver capabilities */
255 SDL_CDcaps.Name = SDL_SYS_CDName;
256 SDL_CDcaps.Open = SDL_SYS_CDOpen;
257 SDL_CDcaps.GetTOC = SDL_SYS_CDGetTOC;
258 SDL_CDcaps.Status = SDL_SYS_CDStatus;
259 SDL_CDcaps.Play = SDL_SYS_CDPlay;
260 SDL_CDcaps.Pause = SDL_SYS_CDPause;
261 SDL_CDcaps.Resume = SDL_SYS_CDResume;
262 SDL_CDcaps.Stop = SDL_SYS_CDStop;
263 SDL_CDcaps.Eject = SDL_SYS_CDEject;
264 SDL_CDcaps.Close = SDL_SYS_CDClose;
266 /* Look in the environment for our CD-ROM drive list */
267 SDLcdrom = SDL_getenv("SDL_CDROM"); /* ':' separated list of devices */
268 if ( SDLcdrom != NULL ) {
269 char *cdpath, *delim;
270 size_t len = SDL_strlen(SDLcdrom)+1;
271 cdpath = SDL_stack_alloc(char, len);
272 if ( cdpath != NULL ) {
273 SDL_strlcpy(cdpath, SDLcdrom, len);
276 delim = SDL_strchr(SDLcdrom, ':');
280 if ( CheckDrive(SDLcdrom, &stbuf) > 0 ) {
281 AddDrive(SDLcdrom, &stbuf);
288 } while ( SDLcdrom );
289 SDL_stack_free(cdpath);
292 /* If we found our drives, there's nothing left to do */
293 if ( SDL_numcds > 0 ) {
298 /* Scan the system for CD-ROM drives */
299 for ( i=0; checklist[i]; ++i ) {
300 if ( checklist[i][0] == '?' ) {
303 for ( j=checklist[i][1]; exists; ++j ) {
304 SDL_snprintf(drive, SDL_arraysize(drive), "/dev/%sc", &checklist[i][3]);
305 insert = SDL_strchr(drive, '?');
306 if ( insert != NULL ) {
309 switch (CheckDrive(drive, &stbuf)) {
310 /* Drive exists and is a CD-ROM */
312 AddDrive(drive, &stbuf);
314 /* Drive exists, but isn't a CD-ROM */
317 /* Drive doesn't exist */
324 SDL_snprintf(drive, SDL_arraysize(drive), "/dev/%s", checklist[i]);
325 if ( CheckDrive(drive, &stbuf) > 0 ) {
326 AddDrive(drive, &stbuf);
333 static const char *SDL_SYS_CDName(int drive)
335 return(SDL_cdlist[drive]);
338 static int SDL_SYS_CDOpen(int drive)
340 return(open(SDL_cdlist[drive], O_RDONLY | O_NONBLOCK | O_EXCL, 0));
343 static int SDL_SYS_CDGetTOC(SDL_CD *cdrom)
345 u_char cdb[10], buf[4], *p, *toc;
346 struct scsi_user_cdb sus;
347 int i, sts, first_track, last_track, ntracks, toc_size;
349 bzero(cdb, sizeof (cdb));
350 cdb[0] = 0x43; /* Read TOC */
351 cdb[1] = 0x2; /* MSF */
352 cdb[8] = 4; /* size TOC header */
353 sts = scsi_cmd(cdrom->id, (cdb_t *)cdb, 10, SUC_READ, buf, 4, &sus);
356 first_track = buf[2];
358 ntracks = last_track - first_track + 1;
359 cdrom->numtracks = ntracks;
360 toc_size = 4 + (ntracks + 1) * 8;
361 toc = (u_char *)SDL_malloc(toc_size);
364 bzero(cdb, sizeof (cdb));
367 cdb[6] = first_track;
368 cdb[7] = toc_size >> 8;
369 cdb[8] = toc_size & 0xff;
370 sts = scsi_cmd(cdrom->id, (cdb_t *)cdb, 10, SUC_READ, toc, toc_size,
378 for (i = 0, p = toc+4; i <= ntracks; i++, p+= 8)
381 cdrom->track[i].id = 0xAA; /* Leadout */
383 cdrom->track[i].id = first_track + i;
385 cdrom->track[i].type = SDL_DATA_TRACK;
387 cdrom->track[i].type = SDL_AUDIO_TRACK;
388 cdrom->track[i].offset = msf_to_frame(p[5], p[6], p[7]);
389 cdrom->track[i].length = 0;
391 cdrom->track[i-1].length = cdrom->track[i].offset -
392 cdrom->track[i-1].offset;
398 /* Get CD-ROM status */
399 static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position)
402 u_char cdb[10], buf[16];
404 struct scsi_user_cdb sus;
406 bzero(cdb, sizeof (cdb));
407 cdb[0] = 0x42; /* read subq */
408 cdb[1] = 0x2; /* MSF */
409 cdb[2] = 0x40; /* q channel */
410 cdb[3] = 1; /* current pos */
411 cdb[7] = sizeof (buf) >> 8;
412 cdb[8] = sizeof (buf) & 0xff;
413 sts = scsi_cmd(cdrom->id, (cdb_t *)cdb, 10, SUC_READ, buf, sizeof (buf),
419 if (TestForMedium(cdrom->id) == 0)
420 status = CD_TRAYEMPTY;
446 if ( status == CD_PLAYING || (status == CD_PAUSED) )
447 *position = msf_to_frame(buf[9], buf[10], buf[11]);
455 static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length)
458 int sts, minute, second, frame, eminute, esecond, eframe;
459 struct scsi_user_cdb sus;
461 bzero(cdb, sizeof(cdb));
462 cdb[0] = 0x47; /* Play */
463 frame_to_msf(start, &minute, &second, &frame);
464 frame_to_msf(start + length, &eminute, &esecond, &eframe);
471 sts = scsi_cmd(cdrom->id, (cdb_t *)cdb, 10, SUC_READ, 0, 0, &sus);
476 pauseresume(SDL_CD *cdrom, int flag)
479 struct scsi_user_cdb sus;
481 bzero(cdb, sizeof (cdb));
484 return(scsi_cmd(cdrom->id, (cdb_t *)cdb, 10, SUC_READ, 0, 0, &sus));
488 static int SDL_SYS_CDPause(SDL_CD *cdrom)
490 return(pauseresume(cdrom, 0));
494 static int SDL_SYS_CDResume(SDL_CD *cdrom)
496 return(pauseresume(cdrom, 1));
500 static int SDL_SYS_CDStop(SDL_CD *cdrom)
503 struct scsi_user_cdb sus;
505 bzero(cdb, sizeof (cdb));
506 cdb[0] = 0x1b; /* stop */
507 cdb[1] = 1; /* immediate */
508 return(scsi_cmd(cdrom->id, (cdb_t *)cdb, 6, SUC_READ, 0, 0, &sus));
511 /* Eject the CD-ROM */
512 static int SDL_SYS_CDEject(SDL_CD *cdrom)
515 struct scsi_user_cdb sus;
517 bzero(cdb, sizeof (cdb));
518 cdb[0] = 0x1b; /* stop */
519 cdb[1] = 1; /* immediate */
520 cdb[4] = 2; /* eject */
521 return(scsi_cmd(cdrom->id, (cdb_t *)cdb, 6, SUC_READ, 0, 0, &sus));
524 /* Close the CD-ROM handle */
525 static void SDL_SYS_CDClose(SDL_CD *cdrom)
530 void SDL_SYS_CDQuit(void)
534 if ( SDL_numcds > 0 ) {
535 for ( i=0; i<SDL_numcds; ++i ) {
536 SDL_free(SDL_cdlist[i]);
542 #endif /* SDL_CDROM_BSDI */