e14743d1 |
1 | /* |
2 | SDL - Simple DirectMedia Layer |
3 | Copyright (C) 1997-2009 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 */ |
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 */ |
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 | |
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/%sc", &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 */ |
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 | |
232 | static const char *SDL_SYS_CDName(int drive) |
233 | { |
234 | return(SDL_cdlist[drive]); |
235 | } |
236 | |
237 | static int SDL_SYS_CDOpen(int drive) |
238 | { |
239 | return(open(SDL_cdlist[drive], (O_RDONLY|O_EXCL|O_NONBLOCK), 0)); |
240 | } |
241 | |
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 */ |
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 */ |
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 */ |
365 | static int SDL_SYS_CDPause(SDL_CD *cdrom) |
366 | { |
367 | return(SDL_SYS_CDioctl(cdrom->id, CDIOCPAUSE, 0)); |
368 | } |
369 | |
370 | /* Resume play */ |
371 | static int SDL_SYS_CDResume(SDL_CD *cdrom) |
372 | { |
373 | return(SDL_SYS_CDioctl(cdrom->id, CDIOCRESUME, 0)); |
374 | } |
375 | |
376 | /* Stop play */ |
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 */ |
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 */ |
389 | static void SDL_SYS_CDClose(SDL_CD *cdrom) |
390 | { |
391 | close(cdrom->id); |
392 | } |
393 | |
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 */ |