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comparison src/cdrom/freebsd/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 e8157fcb3114
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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 <stdlib.h>
32 #include <sys/stat.h>
33 #include <fcntl.h>
34 #include <stdio.h>
35 #include <string.h>
36 #include <errno.h>
37 #include <unistd.h>
38 #include <sys/cdio.h>
39
40 #include "SDL_error.h"
41 #include "SDL_cdrom.h"
42 #include "SDL_syscdrom.h"
43
44
45 /* The maximum number of CD-ROM drives we'll detect */
46 #define MAX_DRIVES 16
47
48 /* A list of available CD-ROM drives */
49 static char *SDL_cdlist[MAX_DRIVES];
50 static dev_t SDL_cdmode[MAX_DRIVES];
51
52 /* The system-dependent CD control functions */
53 static const char *SDL_SYS_CDName(int drive);
54 static int SDL_SYS_CDOpen(int drive);
55 static int SDL_SYS_CDGetTOC(SDL_CD *cdrom);
56 static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position);
57 static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length);
58 static int SDL_SYS_CDPause(SDL_CD *cdrom);
59 static int SDL_SYS_CDResume(SDL_CD *cdrom);
60 static int SDL_SYS_CDStop(SDL_CD *cdrom);
61 static int SDL_SYS_CDEject(SDL_CD *cdrom);
62 static void SDL_SYS_CDClose(SDL_CD *cdrom);
63
64 /* Some ioctl() errno values which occur when the tray is empty */
65 #define ERRNO_TRAYEMPTY(errno) \
66 ((errno == EIO) || (errno == ENOENT) || (errno == EINVAL))
67
68 /* Check a drive to see if it is a CD-ROM */
69 static int CheckDrive(char *drive, struct stat *stbuf)
70 {
71 int is_cd, cdfd;
72 struct ioc_read_subchannel info;
73
74 /* If it doesn't exist, return -1 */
75 if ( stat(drive, stbuf) < 0 ) {
76 return(-1);
77 }
78
79 /* If it does exist, verify that it's an available CD-ROM */
80 is_cd = 0;
81 if ( S_ISCHR(stbuf->st_mode) || S_ISBLK(stbuf->st_mode) ) {
82 cdfd = open(drive, (O_RDONLY|O_EXCL|O_NONBLOCK), 0);
83 if ( cdfd >= 0 ) {
84 info.address_format = CD_MSF_FORMAT;
85 info.data_format = CD_CURRENT_POSITION;
86 info.data_len = 0;
87 info.data = NULL;
88 /* Under Linux, EIO occurs when a disk is not present.
89 This isn't 100% reliable, so we use the USE_MNTENT
90 code above instead.
91 */
92 if ( (ioctl(cdfd, CDIOCREADSUBCHANNEL, &info) == 0) ||
93 ERRNO_TRAYEMPTY(errno) ) {
94 is_cd = 1;
95 }
96 close(cdfd);
97 }
98 }
99 return(is_cd);
100 }
101
102 /* Add a CD-ROM drive to our list of valid drives */
103 static void AddDrive(char *drive, struct stat *stbuf)
104 {
105 int i;
106
107 if ( SDL_numcds < MAX_DRIVES ) {
108 /* Check to make sure it's not already in our list.
109 This can happen when we see a drive via symbolic link.
110 */
111 for ( i=0; i<SDL_numcds; ++i ) {
112 if ( stbuf->st_rdev == SDL_cdmode[i] ) {
113 #ifdef DEBUG_CDROM
114 fprintf(stderr, "Duplicate drive detected: %s == %s\n", drive, SDL_cdlist[i]);
115 #endif
116 return;
117 }
118 }
119
120 /* Add this drive to our list */
121 i = SDL_numcds;
122 SDL_cdlist[i] = (char *)malloc(strlen(drive)+1);
123 if ( SDL_cdlist[i] == NULL ) {
124 SDL_OutOfMemory();
125 return;
126 }
127 strcpy(SDL_cdlist[i], drive);
128 SDL_cdmode[i] = stbuf->st_rdev;
129 ++SDL_numcds;
130 #ifdef DEBUG_CDROM
131 fprintf(stderr, "Added CD-ROM drive: %s\n", drive);
132 #endif
133 }
134 }
135
136 int SDL_SYS_CDInit(void)
137 {
138 /* checklist: /dev/cdrom,/dev/cd?c /dev/acd?c
139 /dev/matcd?c /dev/mcd?c /dev/scd?c */
140 static char *checklist[] = {
141 "cdrom", "?0 cd?", "?0 acd?", "?0 matcd?", "?0 mcd?", "?0 scd?",NULL
142 };
143 char *SDLcdrom;
144 int i, j, exists;
145 char drive[32];
146 struct stat stbuf;
147
148 /* Fill in our driver capabilities */
149 SDL_CDcaps.Name = SDL_SYS_CDName;
150 SDL_CDcaps.Open = SDL_SYS_CDOpen;
151 SDL_CDcaps.GetTOC = SDL_SYS_CDGetTOC;
152 SDL_CDcaps.Status = SDL_SYS_CDStatus;
153 SDL_CDcaps.Play = SDL_SYS_CDPlay;
154 SDL_CDcaps.Pause = SDL_SYS_CDPause;
155 SDL_CDcaps.Resume = SDL_SYS_CDResume;
156 SDL_CDcaps.Stop = SDL_SYS_CDStop;
157 SDL_CDcaps.Eject = SDL_SYS_CDEject;
158 SDL_CDcaps.Close = SDL_SYS_CDClose;
159
160 /* Look in the environment for our CD-ROM drive list */
161 SDLcdrom = getenv("SDL_CDROM"); /* ':' separated list of devices */
162 if ( SDLcdrom != NULL ) {
163 char *cdpath, *delim;
164 cdpath = malloc(strlen(SDLcdrom)+1);
165 if ( cdpath != NULL ) {
166 strcpy(cdpath, SDLcdrom);
167 SDLcdrom = cdpath;
168 do {
169 delim = strchr(SDLcdrom, ':');
170 if ( delim ) {
171 *delim++ = '\0';
172 }
173 if ( CheckDrive(SDLcdrom, &stbuf) > 0 ) {
174 AddDrive(SDLcdrom, &stbuf);
175 }
176 if ( delim ) {
177 SDLcdrom = delim;
178 } else {
179 SDLcdrom = NULL;
180 }
181 } while ( SDLcdrom );
182 free(cdpath);
183 }
184
185 /* If we found our drives, there's nothing left to do */
186 if ( SDL_numcds > 0 ) {
187 return(0);
188 }
189 }
190
191 /* Scan the system for CD-ROM drives */
192 for ( i=0; checklist[i]; ++i ) {
193 if ( checklist[i][0] == '?' ) {
194 char *insert;
195 exists = 1;
196 for ( j=checklist[i][1]; exists; ++j ) {
197 sprintf(drive, "/dev/%sc", &checklist[i][3]);
198 insert = strchr(drive, '?');
199 if ( insert != NULL ) {
200 *insert = j;
201 }
202 switch (CheckDrive(drive, &stbuf)) {
203 /* Drive exists and is a CD-ROM */
204 case 1:
205 AddDrive(drive, &stbuf);
206 break;
207 /* Drive exists, but isn't a CD-ROM */
208 case 0:
209 break;
210 /* Drive doesn't exist */
211 case -1:
212 exists = 0;
213 break;
214 }
215 }
216 } else {
217 sprintf(drive, "/dev/%s", checklist[i]);
218 if ( CheckDrive(drive, &stbuf) > 0 ) {
219 AddDrive(drive, &stbuf);
220 }
221 }
222 }
223 return(0);
224 }
225
226 /* General ioctl() CD-ROM command function */
227 static int SDL_SYS_CDioctl(int id, int command, void *arg)
228 {
229 int retval;
230
231 retval = ioctl(id, command, arg);
232 if ( retval < 0 ) {
233 SDL_SetError("ioctl() error: %s", strerror(errno));
234 }
235 return(retval);
236 }
237
238 static const char *SDL_SYS_CDName(int drive)
239 {
240 return(SDL_cdlist[drive]);
241 }
242
243 static int SDL_SYS_CDOpen(int drive)
244 {
245 return(open(SDL_cdlist[drive], (O_RDONLY|O_EXCL|O_NONBLOCK), 0));
246 }
247
248 static int SDL_SYS_CDGetTOC(SDL_CD *cdrom)
249 {
250 struct ioc_toc_header toc;
251 int i, okay;
252 struct ioc_read_toc_entry entry;
253 struct cd_toc_entry data;
254
255 okay = 0;
256 if ( SDL_SYS_CDioctl(cdrom->id, CDIOREADTOCHEADER, &toc) == 0 ) {
257 cdrom->numtracks = toc.ending_track-toc.starting_track+1;
258 if ( cdrom->numtracks > SDL_MAX_TRACKS ) {
259 cdrom->numtracks = SDL_MAX_TRACKS;
260 }
261 /* Read all the track TOC entries */
262 for ( i=0; i<=cdrom->numtracks; ++i ) {
263 if ( i == cdrom->numtracks ) {
264 cdrom->track[i].id = 0xAA; /* CDROM_LEADOUT */
265 } else {
266 cdrom->track[i].id = toc.starting_track+i;
267 }
268 entry.starting_track = cdrom->track[i].id;
269 entry.address_format = CD_MSF_FORMAT;
270 entry.data_len = sizeof(data);
271 entry.data = &data;
272 if ( SDL_SYS_CDioctl(cdrom->id, CDIOREADTOCENTRYS,
273 &entry) < 0 ) {
274 break;
275 } else {
276 cdrom->track[i].type = data.control;
277 cdrom->track[i].offset = MSF_TO_FRAMES(
278 data.addr.msf.minute,
279 data.addr.msf.second,
280 data.addr.msf.frame);
281 cdrom->track[i].length = 0;
282 if ( i > 0 ) {
283 cdrom->track[i-1].length =
284 cdrom->track[i].offset-
285 cdrom->track[i-1].offset;
286 }
287 }
288 }
289 if ( i == (cdrom->numtracks+1) ) {
290 okay = 1;
291 }
292 }
293 return(okay ? 0 : -1);
294 }
295
296 /* Get CD-ROM status */
297 static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position)
298 {
299 CDstatus status;
300 struct ioc_toc_header toc;
301 struct ioc_read_subchannel info;
302 struct cd_sub_channel_info data;
303
304 info.address_format = CD_MSF_FORMAT;
305 info.data_format = CD_CURRENT_POSITION;
306 info.track = 0;
307 info.data_len = sizeof(data);
308 info.data = &data;
309 if ( ioctl(cdrom->id, CDIOCREADSUBCHANNEL, &info) < 0 ) {
310 if ( ERRNO_TRAYEMPTY(errno) ) {
311 status = CD_TRAYEMPTY;
312 } else {
313 status = CD_ERROR;
314 }
315 } else {
316 switch (data.header.audio_status) {
317 case CD_AS_AUDIO_INVALID:
318 case CD_AS_NO_STATUS:
319 /* Try to determine if there's a CD available */
320 if (ioctl(cdrom->id,CDIOREADTOCHEADER,&toc)==0)
321 status = CD_STOPPED;
322 else
323 status = CD_TRAYEMPTY;
324 break;
325 case CD_AS_PLAY_COMPLETED:
326 status = CD_STOPPED;
327 break;
328 case CD_AS_PLAY_IN_PROGRESS:
329 status = CD_PLAYING;
330 break;
331 case CD_AS_PLAY_PAUSED:
332 status = CD_PAUSED;
333 break;
334 default:
335 status = CD_ERROR;
336 break;
337 }
338 }
339 if ( position ) {
340 if ( status == CD_PLAYING || (status == CD_PAUSED) ) {
341 *position = MSF_TO_FRAMES(
342 data.what.position.absaddr.msf.minute,
343 data.what.position.absaddr.msf.second,
344 data.what.position.absaddr.msf.frame);
345 } else {
346 *position = 0;
347 }
348 }
349 return(status);
350 }
351
352 /* Start play */
353 static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length)
354 {
355 struct ioc_play_msf playtime;
356
357 FRAMES_TO_MSF(start,
358 &playtime.start_m, &playtime.start_s, &playtime.start_f);
359 FRAMES_TO_MSF(start+length,
360 &playtime.end_m, &playtime.end_s, &playtime.end_f);
361 #ifdef DEBUG_CDROM
362 fprintf(stderr, "Trying to play from %d:%d:%d to %d:%d:%d\n",
363 playtime.cdmsf_min0, playtime.cdmsf_sec0, playtime.cdmsf_frame0,
364 playtime.cdmsf_min1, playtime.cdmsf_sec1, playtime.cdmsf_frame1);
365 #endif
366 ioctl(cdrom->id, CDIOCSTART, 0);
367 return(SDL_SYS_CDioctl(cdrom->id, CDIOCPLAYMSF, &playtime));
368 }
369
370 /* Pause play */
371 static int SDL_SYS_CDPause(SDL_CD *cdrom)
372 {
373 return(SDL_SYS_CDioctl(cdrom->id, CDIOCPAUSE, 0));
374 }
375
376 /* Resume play */
377 static int SDL_SYS_CDResume(SDL_CD *cdrom)
378 {
379 return(SDL_SYS_CDioctl(cdrom->id, CDIOCRESUME, 0));
380 }
381
382 /* Stop play */
383 static int SDL_SYS_CDStop(SDL_CD *cdrom)
384 {
385 return(SDL_SYS_CDioctl(cdrom->id, CDIOCSTOP, 0));
386 }
387
388 /* Eject the CD-ROM */
389 static int SDL_SYS_CDEject(SDL_CD *cdrom)
390 {
391 return(SDL_SYS_CDioctl(cdrom->id, CDIOCEJECT, 0));
392 }
393
394 /* Close the CD-ROM handle */
395 static void SDL_SYS_CDClose(SDL_CD *cdrom)
396 {
397 close(cdrom->id);
398 }
399
400 void SDL_SYS_CDQuit(void)
401 {
402 int i;
403
404 if ( SDL_numcds > 0 ) {
405 for ( i=0; i<SDL_numcds; ++i ) {
406 free(SDL_cdlist[i]);
407 }
408 SDL_numcds = 0;
409 }
410 }
411