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comparison src/cdrom/openbsd/SDL_syscdrom.c @ 0:74212992fb08

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Initial revision
author Sam Lantinga <slouken@lokigames.com>
date Thu, 26 Apr 2001 16:45:43 +0000
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children cf2af46e9e2a
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-1:000000000000 0:74212992fb08
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 <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/cdio.h>
40
41 #include "SDL_error.h"
42 #include "SDL_cdrom.h"
43 #include "SDL_syscdrom.h"
44
45
46 /* The maximum number of CD-ROM drives we'll detect */
47 #define MAX_DRIVES 16
48
49 /* A list of available CD-ROM drives */
50 static char *SDL_cdlist[MAX_DRIVES];
51 static dev_t SDL_cdmode[MAX_DRIVES];
52
53 /* The system-dependent CD control functions */
54 static const char *SDL_SYS_CDName(int drive);
55 static int SDL_SYS_CDOpen(int drive);
56 static int SDL_SYS_CDGetTOC(SDL_CD *cdrom);
57 static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position);
58 static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length);
59 static int SDL_SYS_CDPause(SDL_CD *cdrom);
60 static int SDL_SYS_CDResume(SDL_CD *cdrom);
61 static int SDL_SYS_CDStop(SDL_CD *cdrom);
62 static int SDL_SYS_CDEject(SDL_CD *cdrom);
63 static void SDL_SYS_CDClose(SDL_CD *cdrom);
64
65 /* Some ioctl() errno values which occur when the tray is empty */
66 #define ERRNO_TRAYEMPTY(errno) \
67 ((errno == EIO) || (errno == ENOENT) || (errno == EINVAL))
68
69 /* Check a drive to see if it is a CD-ROM */
70 static int CheckDrive(char *drive, struct stat *stbuf)
71 {
72 int is_cd, cdfd;
73 struct ioc_read_subchannel info;
74
75 /* If it doesn't exist, return -1 */
76 if ( stat(drive, stbuf) < 0 ) {
77 return(-1);
78 }
79
80 /* If it does exist, verify that it's an available CD-ROM */
81 is_cd = 0;
82 if ( S_ISCHR(stbuf->st_mode) || S_ISBLK(stbuf->st_mode) ) {
83 cdfd = open(drive, (O_RDONLY|O_EXCL|O_NONBLOCK), 0);
84 if ( cdfd >= 0 ) {
85 info.address_format = CD_MSF_FORMAT;
86 info.data_format = CD_CURRENT_POSITION;
87 info.data_len = 0;
88 info.data = NULL;
89 /* Under Linux, EIO occurs when a disk is not present.
90 This isn't 100% reliable, so we use the USE_MNTENT
91 code above instead.
92 */
93 if ( (ioctl(cdfd, CDIOCREADSUBCHANNEL, &info) == 0) ||
94 ERRNO_TRAYEMPTY(errno) ) {
95 is_cd = 1;
96 }
97 close(cdfd);
98 }
99 }
100 return(is_cd);
101 }
102
103 /* Add a CD-ROM drive to our list of valid drives */
104 static void AddDrive(char *drive, struct stat *stbuf)
105 {
106 int i;
107
108 if ( SDL_numcds < MAX_DRIVES ) {
109 /* Check to make sure it's not already in our list.
110 This can happen when we see a drive via symbolic link.
111 */
112 for ( i=0; i<SDL_numcds; ++i ) {
113 if ( stbuf->st_rdev == SDL_cdmode[i] ) {
114 #ifdef DEBUG_CDROM
115 fprintf(stderr, "Duplicate drive detected: %s == %s\n", drive, SDL_cdlist[i]);
116 #endif
117 return;
118 }
119 }
120
121 /* Add this drive to our list */
122 i = SDL_numcds;
123 SDL_cdlist[i] = (char *)malloc(strlen(drive)+1);
124 if ( SDL_cdlist[i] == NULL ) {
125 SDL_OutOfMemory();
126 return;
127 }
128 strcpy(SDL_cdlist[i], drive);
129 SDL_cdmode[i] = stbuf->st_rdev;
130 ++SDL_numcds;
131 #ifdef DEBUG_CDROM
132 fprintf(stderr, "Added CD-ROM drive: %s\n", drive);
133 #endif
134 }
135 }
136
137 int SDL_SYS_CDInit(void)
138 {
139 static char *checklist[] = {
140 "?0 cd?c", "?0 acd?c", "cdrom", NULL
141 };
142 char *SDLcdrom;
143 int i, j, exists;
144 char drive[32];
145 struct stat stbuf;
146
147 /* Fill in our driver capabilities */
148 SDL_CDcaps.Name = SDL_SYS_CDName;
149 SDL_CDcaps.Open = SDL_SYS_CDOpen;
150 SDL_CDcaps.GetTOC = SDL_SYS_CDGetTOC;
151 SDL_CDcaps.Status = SDL_SYS_CDStatus;
152 SDL_CDcaps.Play = SDL_SYS_CDPlay;
153 SDL_CDcaps.Pause = SDL_SYS_CDPause;
154 SDL_CDcaps.Resume = SDL_SYS_CDResume;
155 SDL_CDcaps.Stop = SDL_SYS_CDStop;
156 SDL_CDcaps.Eject = SDL_SYS_CDEject;
157 SDL_CDcaps.Close = SDL_SYS_CDClose;
158
159 /* Look in the environment for our CD-ROM drive list */
160 SDLcdrom = getenv("SDL_CDROM"); /* ':' separated list of devices */
161 if ( SDLcdrom != NULL ) {
162 char *cdpath, *delim;
163 cdpath = malloc(strlen(SDLcdrom)+1);
164 if ( cdpath != NULL ) {
165 strcpy(cdpath, SDLcdrom);
166 SDLcdrom = cdpath;
167 do {
168 delim = strchr(SDLcdrom, ':');
169 if ( delim ) {
170 *delim++ = '\0';
171 }
172 if ( CheckDrive(SDLcdrom, &stbuf) > 0 ) {
173 AddDrive(SDLcdrom, &stbuf);
174 }
175 if ( delim ) {
176 SDLcdrom = delim;
177 } else {
178 SDLcdrom = NULL;
179 }
180 } while ( SDLcdrom );
181 free(cdpath);
182 }
183
184 /* If we found our drives, there's nothing left to do */
185 if ( SDL_numcds > 0 ) {
186 return(0);
187 }
188 }
189
190 /* Scan the system for CD-ROM drives */
191 for ( i=0; checklist[i]; ++i ) {
192 if ( checklist[i][0] == '?' ) {
193 char *insert;
194 exists = 1;
195 for ( j=checklist[i][1]; exists; ++j ) {
196 sprintf(drive, "/dev/%s", &checklist[i][3]);
197 insert = strchr(drive, '?');
198 if ( insert != NULL ) {
199 *insert = j;
200 }
201 switch (CheckDrive(drive, &stbuf)) {
202 /* Drive exists and is a CD-ROM */
203 case 1:
204 AddDrive(drive, &stbuf);
205 break;
206 /* Drive exists, but isn't a CD-ROM */
207 case 0:
208 break;
209 /* Drive doesn't exist */
210 case -1:
211 exists = 0;
212 break;
213 }
214 }
215 } else {
216 sprintf(drive, "/dev/%s", checklist[i]);
217 if ( CheckDrive(drive, &stbuf) > 0 ) {
218 AddDrive(drive, &stbuf);
219 }
220 }
221 }
222 return(0);
223 }
224
225 /* General ioctl() CD-ROM command function */
226 static int SDL_SYS_CDioctl(int id, int command, void *arg)
227 {
228 int retval;
229
230 retval = ioctl(id, command, arg);
231 if ( retval < 0 ) {
232 SDL_SetError("ioctl() error: %s", strerror(errno));
233 }
234 return(retval);
235 }
236
237 static const char *SDL_SYS_CDName(int drive)
238 {
239 return(SDL_cdlist[drive]);
240 }
241
242 static int SDL_SYS_CDOpen(int drive)
243 {
244 return(open(SDL_cdlist[drive], (O_RDONLY|O_EXCL|O_NONBLOCK), 0));
245 }
246
247 static int SDL_SYS_CDGetTOC(SDL_CD *cdrom)
248 {
249 struct ioc_toc_header toc;
250 int i, okay;
251 struct ioc_read_toc_entry entry;
252 struct cd_toc_entry data;
253
254 okay = 0;
255 if ( SDL_SYS_CDioctl(cdrom->id, CDIOREADTOCHEADER, &toc) == 0 ) {
256 cdrom->numtracks = toc.ending_track-toc.starting_track+1;
257 if ( cdrom->numtracks > SDL_MAX_TRACKS ) {
258 cdrom->numtracks = SDL_MAX_TRACKS;
259 }
260 /* Read all the track TOC entries */
261 for ( i=0; i<=cdrom->numtracks; ++i ) {
262 if ( i == cdrom->numtracks ) {
263 cdrom->track[i].id = 0xAA; /* CDROM_LEADOUT */
264 } else {
265 cdrom->track[i].id = toc.starting_track+i;
266 }
267 entry.starting_track = cdrom->track[i].id;
268 entry.address_format = CD_MSF_FORMAT;
269 entry.data_len = sizeof(data);
270 entry.data = &data;
271 if ( SDL_SYS_CDioctl(cdrom->id, CDIOREADTOCENTRYS,
272 &entry) < 0 ) {
273 break;
274 } else {
275 cdrom->track[i].type = data.control;
276 cdrom->track[i].offset = MSF_TO_FRAMES(
277 data.addr.msf.minute,
278 data.addr.msf.second,
279 data.addr.msf.frame);
280 cdrom->track[i].length = 0;
281 if ( i > 0 ) {
282 cdrom->track[i-1].length =
283 cdrom->track[i].offset-
284 cdrom->track[i-1].offset;
285 }
286 }
287 }
288 if ( i == (cdrom->numtracks+1) ) {
289 okay = 1;
290 }
291 }
292 return(okay ? 0 : -1);
293 }
294
295 /* Get CD-ROM status */
296 static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position)
297 {
298 CDstatus status;
299 struct ioc_toc_header toc;
300 struct ioc_read_subchannel info;
301 struct cd_sub_channel_info data;
302
303 info.address_format = CD_MSF_FORMAT;
304 info.data_format = CD_CURRENT_POSITION;
305 info.track = 0;
306 info.data_len = sizeof(data);
307 info.data = &data;
308 if ( ioctl(cdrom->id, CDIOCREADSUBCHANNEL, &info) < 0 ) {
309 if ( ERRNO_TRAYEMPTY(errno) ) {
310 status = CD_TRAYEMPTY;
311 } else {
312 status = CD_ERROR;
313 }
314 } else {
315 switch (data.header.audio_status) {
316 case CD_AS_AUDIO_INVALID:
317 case CD_AS_NO_STATUS:
318 /* Try to determine if there's a CD available */
319 if (ioctl(cdrom->id,CDIOREADTOCHEADER,&toc)==0)
320 status = CD_STOPPED;
321 else
322 status = CD_TRAYEMPTY;
323 break;
324 case CD_AS_PLAY_COMPLETED:
325 status = CD_STOPPED;
326 break;
327 case CD_AS_PLAY_IN_PROGRESS:
328 status = CD_PLAYING;
329 break;
330 case CD_AS_PLAY_PAUSED:
331 status = CD_PAUSED;
332 break;
333 default:
334 status = CD_ERROR;
335 break;
336 }
337 }
338 if ( position ) {
339 if ( status == CD_PLAYING || (status == CD_PAUSED) ) {
340 *position = MSF_TO_FRAMES(
341 data.what.position.absaddr.msf.minute,
342 data.what.position.absaddr.msf.second,
343 data.what.position.absaddr.msf.frame);
344 } else {
345 *position = 0;
346 }
347 }
348 return(status);
349 }
350
351 /* Start play */
352 static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length)
353 {
354 struct ioc_play_msf playtime;
355
356 FRAMES_TO_MSF(start,
357 &playtime.start_m, &playtime.start_s, &playtime.start_f);
358 FRAMES_TO_MSF(start+length,
359 &playtime.end_m, &playtime.end_s, &playtime.end_f);
360 #ifdef DEBUG_CDROM
361 fprintf(stderr, "Trying to play from %d:%d:%d to %d:%d:%d\n",
362 playtime.start_m, playtime.start_s, playtime.start_f,
363 playtime.end_m, playtime.end_s, playtime.end_f);
364 #endif
365 ioctl(cdrom->id, CDIOCSTART, 0);
366 return(SDL_SYS_CDioctl(cdrom->id, CDIOCPLAYMSF, &playtime));
367 }
368
369 /* Pause play */
370 static int SDL_SYS_CDPause(SDL_CD *cdrom)
371 {
372 return(SDL_SYS_CDioctl(cdrom->id, CDIOCPAUSE, 0));
373 }
374
375 /* Resume play */
376 static int SDL_SYS_CDResume(SDL_CD *cdrom)
377 {
378 return(SDL_SYS_CDioctl(cdrom->id, CDIOCRESUME, 0));
379 }
380
381 /* Stop play */
382 static int SDL_SYS_CDStop(SDL_CD *cdrom)
383 {
384 return(SDL_SYS_CDioctl(cdrom->id, CDIOCSTOP, 0));
385 }
386
387 /* Eject the CD-ROM */
388 static int SDL_SYS_CDEject(SDL_CD *cdrom)
389 {
390 return(SDL_SYS_CDioctl(cdrom->id, CDIOCEJECT, 0));
391 }
392
393 /* Close the CD-ROM handle */
394 static void SDL_SYS_CDClose(SDL_CD *cdrom)
395 {
396 close(cdrom->id);
397 }
398
399 void SDL_SYS_CDQuit(void)
400 {
401 int i;
402
403 if ( SDL_numcds > 0 ) {
404 for ( i=0; i<SDL_numcds; ++i ) {
405 free(SDL_cdlist[i]);
406 }
407 SDL_numcds = 0;
408 }
409 }
410