1 /*
2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997-2012 Sam Lantinga
4
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.
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 Lesser General Public License for more details.
14
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
18
19 Sam Lantinga
20 slouken@libsdl.org
21 */
22 #include "SDL_config.h"
23
24 #ifdef SDL_CDROM_FREEBSD
25
26 /* Functions for system-level CD-ROM audio control */
27
28 #include <sys/types.h>
29 #include <sys/stat.h>
30 #include <fcntl.h>
31 #include <errno.h>
32 #include <unistd.h>
33 #include <sys/cdio.h>
34
35 #include "SDL_cdrom.h"
36 #include "../SDL_syscdrom.h"
37
38
39 /* The maximum number of CD-ROM drives we'll detect */
40 #define MAX_DRIVES 16
41
42 /* A list of available CD-ROM drives */
43 static char *SDL_cdlist[MAX_DRIVES];
44 static dev_t SDL_cdmode[MAX_DRIVES];
45
46 /* The system-dependent CD control functions */
47 static const char *SDL_SYS_CDName(int drive);
48 static int SDL_SYS_CDOpen(int drive);
49 static int SDL_SYS_CDGetTOC(SDL_CD *cdrom);
50 static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position);
51 static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length);
52 static int SDL_SYS_CDPause(SDL_CD *cdrom);
53 static int SDL_SYS_CDResume(SDL_CD *cdrom);
54 static int SDL_SYS_CDStop(SDL_CD *cdrom);
55 static int SDL_SYS_CDEject(SDL_CD *cdrom);
56 static void SDL_SYS_CDClose(SDL_CD *cdrom);
57
58 /* Some ioctl() errno values which occur when the tray is empty */
59 #define ERRNO_TRAYEMPTY(errno) \
60 ((errno == EIO) || (errno == ENOENT) || (errno == EINVAL))
61
62 /* Check a drive to see if it is a CD-ROM */
CheckDrive(char * drive,struct stat * stbuf)63 static int CheckDrive(char *drive, struct stat *stbuf)
64 {
65 int is_cd, cdfd;
66 struct ioc_read_subchannel info;
67
68 /* If it doesn't exist, return -1 */
69 if ( stat(drive, stbuf) < 0 ) {
70 return(-1);
71 }
72
73 /* If it does exist, verify that it's an available CD-ROM */
74 is_cd = 0;
75 if ( S_ISCHR(stbuf->st_mode) || S_ISBLK(stbuf->st_mode) ) {
76 cdfd = open(drive, (O_RDONLY|O_EXCL|O_NONBLOCK), 0);
77 if ( cdfd >= 0 ) {
78 info.address_format = CD_MSF_FORMAT;
79 info.data_format = CD_CURRENT_POSITION;
80 info.data_len = 0;
81 info.data = NULL;
82 /* Under Linux, EIO occurs when a disk is not present.
83 This isn't 100% reliable, so we use the USE_MNTENT
84 code above instead.
85 */
86 if ( (ioctl(cdfd, CDIOCREADSUBCHANNEL, &info) == 0) ||
87 ERRNO_TRAYEMPTY(errno) ) {
88 is_cd = 1;
89 }
90 close(cdfd);
91 }
92 }
93 return(is_cd);
94 }
95
96 /* Add a CD-ROM drive to our list of valid drives */
AddDrive(char * drive,struct stat * stbuf)97 static void AddDrive(char *drive, struct stat *stbuf)
98 {
99 int i;
100
101 if ( SDL_numcds < MAX_DRIVES ) {
102 /* Check to make sure it's not already in our list.
103 This can happen when we see a drive via symbolic link.
104 */
105 for ( i=0; i<SDL_numcds; ++i ) {
106 if ( stbuf->st_rdev == SDL_cdmode[i] ) {
107 #ifdef DEBUG_CDROM
108 fprintf(stderr, "Duplicate drive detected: %s == %s\n", drive, SDL_cdlist[i]);
109 #endif
110 return;
111 }
112 }
113
114 /* Add this drive to our list */
115 i = SDL_numcds;
116 SDL_cdlist[i] = SDL_strdup(drive);
117 if ( SDL_cdlist[i] == NULL ) {
118 SDL_OutOfMemory();
119 return;
120 }
121 SDL_cdmode[i] = stbuf->st_rdev;
122 ++SDL_numcds;
123 #ifdef DEBUG_CDROM
124 fprintf(stderr, "Added CD-ROM drive: %s\n", drive);
125 #endif
126 }
127 }
128
SDL_SYS_CDInit(void)129 int SDL_SYS_CDInit(void)
130 {
131 /* checklist: /dev/cdrom,/dev/cd?c /dev/acd?c
132 /dev/matcd?c /dev/mcd?c /dev/scd?c */
133 static char *checklist[] = {
134 "cdrom", "?0 cd?", "?0 acd?", "?0 matcd?", "?0 mcd?", "?0 scd?",NULL
135 };
136 char *SDLcdrom;
137 int i, j, exists;
138 char drive[32];
139 struct stat stbuf;
140
141 /* Fill in our driver capabilities */
142 SDL_CDcaps.Name = SDL_SYS_CDName;
143 SDL_CDcaps.Open = SDL_SYS_CDOpen;
144 SDL_CDcaps.GetTOC = SDL_SYS_CDGetTOC;
145 SDL_CDcaps.Status = SDL_SYS_CDStatus;
146 SDL_CDcaps.Play = SDL_SYS_CDPlay;
147 SDL_CDcaps.Pause = SDL_SYS_CDPause;
148 SDL_CDcaps.Resume = SDL_SYS_CDResume;
149 SDL_CDcaps.Stop = SDL_SYS_CDStop;
150 SDL_CDcaps.Eject = SDL_SYS_CDEject;
151 SDL_CDcaps.Close = SDL_SYS_CDClose;
152
153 /* Look in the environment for our CD-ROM drive list */
154 SDLcdrom = SDL_getenv("SDL_CDROM"); /* ':' separated list of devices */
155 if ( SDLcdrom != NULL ) {
156 char *cdpath, *delim;
157 size_t len = SDL_strlen(SDLcdrom)+1;
158 cdpath = SDL_stack_alloc(char, len);
159 if ( cdpath != NULL ) {
160 SDL_strlcpy(cdpath, SDLcdrom, len);
161 SDLcdrom = cdpath;
162 do {
163 delim = SDL_strchr(SDLcdrom, ':');
164 if ( delim ) {
165 *delim++ = '\0';
166 }
167 if ( CheckDrive(SDLcdrom, &stbuf) > 0 ) {
168 AddDrive(SDLcdrom, &stbuf);
169 }
170 if ( delim ) {
171 SDLcdrom = delim;
172 } else {
173 SDLcdrom = NULL;
174 }
175 } while ( SDLcdrom );
176 SDL_stack_free(cdpath);
177 }
178
179 /* If we found our drives, there's nothing left to do */
180 if ( SDL_numcds > 0 ) {
181 return(0);
182 }
183 }
184
185 /* Scan the system for CD-ROM drives */
186 for ( i=0; checklist[i]; ++i ) {
187 if ( checklist[i][0] == '?' ) {
188 char *insert;
189 exists = 1;
190 for ( j=checklist[i][1]; exists; ++j ) {
191 SDL_snprintf(drive, SDL_arraysize(drive), "/dev/%s", &checklist[i][3]);
192 insert = SDL_strchr(drive, '?');
193 if ( insert != NULL ) {
194 *insert = j;
195 }
196 switch (CheckDrive(drive, &stbuf)) {
197 /* Drive exists and is a CD-ROM */
198 case 1:
199 AddDrive(drive, &stbuf);
200 break;
201 /* Drive exists, but isn't a CD-ROM */
202 case 0:
203 break;
204 /* Drive doesn't exist */
205 case -1:
206 exists = 0;
207 break;
208 }
209 }
210 } else {
211 SDL_snprintf(drive, SDL_arraysize(drive), "/dev/%s", checklist[i]);
212 if ( CheckDrive(drive, &stbuf) > 0 ) {
213 AddDrive(drive, &stbuf);
214 }
215 }
216 }
217 return(0);
218 }
219
220 /* General ioctl() CD-ROM command function */
SDL_SYS_CDioctl(int id,int command,void * arg)221 static int SDL_SYS_CDioctl(int id, int command, void *arg)
222 {
223 int retval;
224
225 retval = ioctl(id, command, arg);
226 if ( retval < 0 ) {
227 SDL_SetError("ioctl() error: %s", strerror(errno));
228 }
229 return(retval);
230 }
231
SDL_SYS_CDName(int drive)232 static const char *SDL_SYS_CDName(int drive)
233 {
234 return(SDL_cdlist[drive]);
235 }
236
SDL_SYS_CDOpen(int drive)237 static int SDL_SYS_CDOpen(int drive)
238 {
239 return(open(SDL_cdlist[drive], (O_RDONLY|O_EXCL|O_NONBLOCK), 0));
240 }
241
SDL_SYS_CDGetTOC(SDL_CD * cdrom)242 static int SDL_SYS_CDGetTOC(SDL_CD *cdrom)
243 {
244 struct ioc_toc_header toc;
245 int i, okay;
246 struct ioc_read_toc_entry entry;
247 struct cd_toc_entry data;
248
249 okay = 0;
250 if ( SDL_SYS_CDioctl(cdrom->id, CDIOREADTOCHEADER, &toc) == 0 ) {
251 cdrom->numtracks = toc.ending_track-toc.starting_track+1;
252 if ( cdrom->numtracks > SDL_MAX_TRACKS ) {
253 cdrom->numtracks = SDL_MAX_TRACKS;
254 }
255 /* Read all the track TOC entries */
256 for ( i=0; i<=cdrom->numtracks; ++i ) {
257 if ( i == cdrom->numtracks ) {
258 cdrom->track[i].id = 0xAA; /* CDROM_LEADOUT */
259 } else {
260 cdrom->track[i].id = toc.starting_track+i;
261 }
262 entry.starting_track = cdrom->track[i].id;
263 entry.address_format = CD_MSF_FORMAT;
264 entry.data_len = sizeof(data);
265 entry.data = &data;
266 if ( SDL_SYS_CDioctl(cdrom->id, CDIOREADTOCENTRYS,
267 &entry) < 0 ) {
268 break;
269 } else {
270 cdrom->track[i].type = data.control;
271 cdrom->track[i].offset = MSF_TO_FRAMES(
272 data.addr.msf.minute,
273 data.addr.msf.second,
274 data.addr.msf.frame);
275 cdrom->track[i].length = 0;
276 if ( i > 0 ) {
277 cdrom->track[i-1].length =
278 cdrom->track[i].offset-
279 cdrom->track[i-1].offset;
280 }
281 }
282 }
283 if ( i == (cdrom->numtracks+1) ) {
284 okay = 1;
285 }
286 }
287 return(okay ? 0 : -1);
288 }
289
290 /* Get CD-ROM status */
SDL_SYS_CDStatus(SDL_CD * cdrom,int * position)291 static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position)
292 {
293 CDstatus status;
294 struct ioc_toc_header toc;
295 struct ioc_read_subchannel info;
296 struct cd_sub_channel_info data;
297
298 info.address_format = CD_MSF_FORMAT;
299 info.data_format = CD_CURRENT_POSITION;
300 info.track = 0;
301 info.data_len = sizeof(data);
302 info.data = &data;
303 if ( ioctl(cdrom->id, CDIOCREADSUBCHANNEL, &info) < 0 ) {
304 if ( ERRNO_TRAYEMPTY(errno) ) {
305 status = CD_TRAYEMPTY;
306 } else {
307 status = CD_ERROR;
308 }
309 } else {
310 switch (data.header.audio_status) {
311 case CD_AS_AUDIO_INVALID:
312 case CD_AS_NO_STATUS:
313 /* Try to determine if there's a CD available */
314 if (ioctl(cdrom->id,CDIOREADTOCHEADER,&toc)==0)
315 status = CD_STOPPED;
316 else
317 status = CD_TRAYEMPTY;
318 break;
319 case CD_AS_PLAY_COMPLETED:
320 status = CD_STOPPED;
321 break;
322 case CD_AS_PLAY_IN_PROGRESS:
323 status = CD_PLAYING;
324 break;
325 case CD_AS_PLAY_PAUSED:
326 status = CD_PAUSED;
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 data.what.position.absaddr.msf.minute,
337 data.what.position.absaddr.msf.second,
338 data.what.position.absaddr.msf.frame);
339 } else {
340 *position = 0;
341 }
342 }
343 return(status);
344 }
345
346 /* Start play */
SDL_SYS_CDPlay(SDL_CD * cdrom,int start,int length)347 static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length)
348 {
349 struct ioc_play_msf playtime;
350
351 FRAMES_TO_MSF(start,
352 &playtime.start_m, &playtime.start_s, &playtime.start_f);
353 FRAMES_TO_MSF(start+length,
354 &playtime.end_m, &playtime.end_s, &playtime.end_f);
355 #ifdef DEBUG_CDROM
356 fprintf(stderr, "Trying to play from %d:%d:%d to %d:%d:%d\n",
357 playtime.cdmsf_min0, playtime.cdmsf_sec0, playtime.cdmsf_frame0,
358 playtime.cdmsf_min1, playtime.cdmsf_sec1, playtime.cdmsf_frame1);
359 #endif
360 ioctl(cdrom->id, CDIOCSTART, 0);
361 return(SDL_SYS_CDioctl(cdrom->id, CDIOCPLAYMSF, &playtime));
362 }
363
364 /* Pause play */
SDL_SYS_CDPause(SDL_CD * cdrom)365 static int SDL_SYS_CDPause(SDL_CD *cdrom)
366 {
367 return(SDL_SYS_CDioctl(cdrom->id, CDIOCPAUSE, 0));
368 }
369
370 /* Resume play */
SDL_SYS_CDResume(SDL_CD * cdrom)371 static int SDL_SYS_CDResume(SDL_CD *cdrom)
372 {
373 return(SDL_SYS_CDioctl(cdrom->id, CDIOCRESUME, 0));
374 }
375
376 /* Stop play */
SDL_SYS_CDStop(SDL_CD * cdrom)377 static int SDL_SYS_CDStop(SDL_CD *cdrom)
378 {
379 return(SDL_SYS_CDioctl(cdrom->id, CDIOCSTOP, 0));
380 }
381
382 /* Eject the CD-ROM */
SDL_SYS_CDEject(SDL_CD * cdrom)383 static int SDL_SYS_CDEject(SDL_CD *cdrom)
384 {
385 return(SDL_SYS_CDioctl(cdrom->id, CDIOCEJECT, 0));
386 }
387
388 /* Close the CD-ROM handle */
SDL_SYS_CDClose(SDL_CD * cdrom)389 static void SDL_SYS_CDClose(SDL_CD *cdrom)
390 {
391 close(cdrom->id);
392 }
393
SDL_SYS_CDQuit(void)394 void SDL_SYS_CDQuit(void)
395 {
396 int i;
397
398 if ( SDL_numcds > 0 ) {
399 for ( i=0; i<SDL_numcds; ++i ) {
400 SDL_free(SDL_cdlist[i]);
401 }
402 SDL_numcds = 0;
403 }
404 }
405
406 #endif /* SDL_CDROM_FREEBSD */
407