This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
/
SDL_syscdrom.c
430 lines (388 loc) · 12.1 KB
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
11
12
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13
Lesser General Public License for more details.
14
15
16
17
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
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
25
#ifdef SDL_CDROM_OPENBSD
26
27
28
29
30
31
32
33
/* Functions for system-level CD-ROM audio control */
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
34
#include <sys/ioctl.h>
35
36
37
#include <sys/cdio.h>
#include "SDL_cdrom.h"
38
#include "../SDL_syscdrom.h"
39
40
41
/* The maximum number of CD-ROM drives we'll detect */
42
#define MAX_DRIVES 16
43
44
45
46
47
48
49
50
/* A list of available CD-ROM drives */
static char *SDL_cdlist[MAX_DRIVES];
static dev_t SDL_cdmode[MAX_DRIVES];
/* The system-dependent CD control functions */
static const char *SDL_SYS_CDName(int drive);
static int SDL_SYS_CDOpen(int drive);
51
52
53
54
55
56
57
58
static int SDL_SYS_CDGetTOC(SDL_CD * cdrom);
static CDstatus SDL_SYS_CDStatus(SDL_CD * cdrom, int *position);
static int SDL_SYS_CDPlay(SDL_CD * cdrom, int start, int length);
static int SDL_SYS_CDPause(SDL_CD * cdrom);
static int SDL_SYS_CDResume(SDL_CD * cdrom);
static int SDL_SYS_CDStop(SDL_CD * cdrom);
static int SDL_SYS_CDEject(SDL_CD * cdrom);
static void SDL_SYS_CDClose(SDL_CD * cdrom);
59
60
61
/* Some ioctl() errno values which occur when the tray is empty */
#define ERRNO_TRAYEMPTY(errno) \
62
63
((errno == EIO) || (errno == ENOENT) || (errno == EINVAL) || \
(errno == ENODEV))
64
65
/* Check a drive to see if it is a CD-ROM */
66
67
static int
CheckDrive(char *drive, struct stat *stbuf)
68
{
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
int is_cd, cdfd;
struct ioc_read_subchannel info;
/* If it doesn't exist, return -1 */
if (stat(drive, stbuf) < 0) {
return (-1);
}
/* If it does exist, verify that it's an available CD-ROM */
is_cd = 0;
if (S_ISCHR(stbuf->st_mode) || S_ISBLK(stbuf->st_mode)) {
cdfd = open(drive, (O_RDONLY | O_EXCL | O_NONBLOCK), 0);
if (cdfd >= 0) {
info.address_format = CD_MSF_FORMAT;
info.data_format = CD_CURRENT_POSITION;
info.data_len = 0;
info.data = NULL;
/* Under Linux, EIO occurs when a disk is not present.
This isn't 100% reliable, so we use the USE_MNTENT
code above instead.
*/
if ((ioctl(cdfd, CDIOCREADSUBCHANNEL, &info) == 0) ||
ERRNO_TRAYEMPTY(errno)) {
is_cd = 1;
}
close(cdfd);
} else if (ERRNO_TRAYEMPTY(errno))
is_cd = 1;
}
return (is_cd);
99
100
101
}
/* Add a CD-ROM drive to our list of valid drives */
102
103
static void
AddDrive(char *drive, struct stat *stbuf)
104
{
105
106
107
108
109
110
111
112
int i;
if (SDL_numcds < MAX_DRIVES) {
/* Check to make sure it's not already in our list.
This can happen when we see a drive via symbolic link.
*/
for (i = 0; i < SDL_numcds; ++i) {
if (stbuf->st_rdev == SDL_cdmode[i]) {
113
#ifdef DEBUG_CDROM
114
115
fprintf(stderr, "Duplicate drive detected: %s == %s\n",
drive, SDL_cdlist[i]);
116
#endif
117
118
119
120
121
122
123
124
125
126
127
128
129
return;
}
}
/* Add this drive to our list */
i = SDL_numcds;
SDL_cdlist[i] = SDL_strdup(drive);
if (SDL_cdlist[i] == NULL) {
SDL_OutOfMemory();
return;
}
SDL_cdmode[i] = stbuf->st_rdev;
++SDL_numcds;
130
#ifdef DEBUG_CDROM
131
fprintf(stderr, "Added CD-ROM drive: %s\n", drive);
132
#endif
133
}
134
135
}
136
137
int
SDL_SYS_CDInit(void)
138
{
139
static char *checklist[] = {
140
#if defined(__OPENBSD__)
141
"?0 cd?c", "cdrom", NULL
142
#elif defined(__NETBSD__)
143
"?0 cd?d", "?0 cd?c", "cdrom", NULL
144
#else
145
"?0 cd?c", "?0 acd?c", "cdrom", NULL
146
#endif
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
};
char *SDLcdrom;
int i, j, exists;
char drive[32];
struct stat stbuf;
/* Fill in our driver capabilities */
SDL_CDcaps.Name = SDL_SYS_CDName;
SDL_CDcaps.Open = SDL_SYS_CDOpen;
SDL_CDcaps.GetTOC = SDL_SYS_CDGetTOC;
SDL_CDcaps.Status = SDL_SYS_CDStatus;
SDL_CDcaps.Play = SDL_SYS_CDPlay;
SDL_CDcaps.Pause = SDL_SYS_CDPause;
SDL_CDcaps.Resume = SDL_SYS_CDResume;
SDL_CDcaps.Stop = SDL_SYS_CDStop;
SDL_CDcaps.Eject = SDL_SYS_CDEject;
SDL_CDcaps.Close = SDL_SYS_CDClose;
/* Look in the environment for our CD-ROM drive list */
SDLcdrom = SDL_getenv("SDL_CDROM"); /* ':' separated list of devices */
if (SDLcdrom != NULL) {
char *cdpath, *delim;
size_t len = SDL_strlen(SDLcdrom) + 1;
cdpath = SDL_stack_alloc(char, len);
if (cdpath != NULL) {
SDL_strlcpy(cdpath, SDLcdrom, len);
SDLcdrom = cdpath;
do {
delim = SDL_strchr(SDLcdrom, ':');
if (delim) {
*delim++ = '\0';
}
if (CheckDrive(SDLcdrom, &stbuf) > 0) {
AddDrive(SDLcdrom, &stbuf);
}
if (delim) {
SDLcdrom = delim;
} else {
SDLcdrom = NULL;
}
187
} while (SDLcdrom);
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
SDL_stack_free(cdpath);
}
/* If we found our drives, there's nothing left to do */
if (SDL_numcds > 0) {
return (0);
}
}
/* Scan the system for CD-ROM drives */
for (i = 0; checklist[i]; ++i) {
if (checklist[i][0] == '?') {
char *insert;
exists = 1;
for (j = checklist[i][1]; exists; ++j) {
SDL_snprintf(drive, SDL_arraysize(drive), "/dev/%s",
&checklist[i][3]);
insert = SDL_strchr(drive, '?');
if (insert != NULL) {
*insert = j;
}
switch (CheckDrive(drive, &stbuf)) {
/* Drive exists and is a CD-ROM */
case 1:
AddDrive(drive, &stbuf);
break;
/* Drive exists, but isn't a CD-ROM */
case 0:
break;
/* Drive doesn't exist */
case -1:
exists = 0;
break;
}
}
} else {
SDL_snprintf(drive, SDL_arraysize(drive), "/dev/%s",
checklist[i]);
if (CheckDrive(drive, &stbuf) > 0) {
AddDrive(drive, &stbuf);
}
}
}
return (0);
232
233
234
}
/* General ioctl() CD-ROM command function */
235
236
static int
SDL_SYS_CDioctl(int id, int command, void *arg)
237
{
238
int retval;
239
240
241
242
243
244
retval = ioctl(id, command, arg);
if (retval < 0) {
SDL_SetError("ioctl() error: %s", strerror(errno));
}
return (retval);
245
246
}
247
248
static const char *
SDL_SYS_CDName(int drive)
249
{
250
return (SDL_cdlist[drive]);
251
252
}
253
254
static int
SDL_SYS_CDOpen(int drive)
255
{
256
return (open(SDL_cdlist[drive], (O_RDONLY | O_EXCL | O_NONBLOCK), 0));
257
258
}
259
260
static int
SDL_SYS_CDGetTOC(SDL_CD * cdrom)
261
{
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
struct ioc_toc_header toc;
int i, okay;
struct ioc_read_toc_entry entry;
struct cd_toc_entry data;
okay = 0;
if (SDL_SYS_CDioctl(cdrom->id, CDIOREADTOCHEADER, &toc) == 0) {
cdrom->numtracks = toc.ending_track - toc.starting_track + 1;
if (cdrom->numtracks > SDL_MAX_TRACKS) {
cdrom->numtracks = SDL_MAX_TRACKS;
}
/* Read all the track TOC entries */
for (i = 0; i <= cdrom->numtracks; ++i) {
if (i == cdrom->numtracks) {
cdrom->track[i].id = 0xAA; /* CDROM_LEADOUT */
} else {
cdrom->track[i].id = toc.starting_track + i;
}
entry.starting_track = cdrom->track[i].id;
entry.address_format = CD_MSF_FORMAT;
entry.data_len = sizeof(data);
entry.data = &data;
if (SDL_SYS_CDioctl(cdrom->id, CDIOREADTOCENTRYS, &entry) < 0) {
break;
} else {
cdrom->track[i].type = data.control;
cdrom->track[i].offset =
MSF_TO_FRAMES(data.addr.msf.minute,
data.addr.msf.second, data.addr.msf.frame);
cdrom->track[i].length = 0;
if (i > 0) {
cdrom->track[i - 1].length =
cdrom->track[i].offset - cdrom->track[i - 1].offset;
}
}
}
if (i == (cdrom->numtracks + 1)) {
okay = 1;
}
}
return (okay ? 0 : -1);
303
304
305
}
/* Get CD-ROM status */
306
307
static CDstatus
SDL_SYS_CDStatus(SDL_CD * cdrom, int *position)
308
{
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
CDstatus status;
struct ioc_toc_header toc;
struct ioc_read_subchannel info;
struct cd_sub_channel_info data;
info.address_format = CD_MSF_FORMAT;
info.data_format = CD_CURRENT_POSITION;
info.track = 0;
info.data_len = sizeof(data);
info.data = &data;
if (ioctl(cdrom->id, CDIOCREADSUBCHANNEL, &info) < 0) {
if (ERRNO_TRAYEMPTY(errno)) {
status = CD_TRAYEMPTY;
} else {
status = CD_ERROR;
}
} else {
switch (data.header.audio_status) {
case CD_AS_AUDIO_INVALID:
case CD_AS_NO_STATUS:
/* Try to determine if there's a CD available */
if (ioctl(cdrom->id, CDIOREADTOCHEADER, &toc) == 0)
status = CD_STOPPED;
else
status = CD_TRAYEMPTY;
break;
case CD_AS_PLAY_COMPLETED:
status = CD_STOPPED;
break;
case CD_AS_PLAY_IN_PROGRESS:
status = CD_PLAYING;
break;
case CD_AS_PLAY_PAUSED:
status = CD_PAUSED;
break;
default:
status = CD_ERROR;
break;
}
}
if (position) {
if (status == CD_PLAYING || (status == CD_PAUSED)) {
*position =
MSF_TO_FRAMES(data.what.position.absaddr.msf.minute,
data.what.position.absaddr.msf.second,
data.what.position.absaddr.msf.frame);
} else {
*position = 0;
}
}
return (status);
360
361
362
}
/* Start play */
363
364
static int
SDL_SYS_CDPlay(SDL_CD * cdrom, int start, int length)
365
{
366
struct ioc_play_msf playtime;
367
368
369
370
371
FRAMES_TO_MSF(start,
&playtime.start_m, &playtime.start_s, &playtime.start_f);
FRAMES_TO_MSF(start + length,
&playtime.end_m, &playtime.end_s, &playtime.end_f);
372
#ifdef DEBUG_CDROM
373
374
375
fprintf(stderr, "Trying to play from %d:%d:%d to %d:%d:%d\n",
playtime.start_m, playtime.start_s, playtime.start_f,
playtime.end_m, playtime.end_s, playtime.end_f);
376
#endif
377
378
ioctl(cdrom->id, CDIOCSTART, 0);
return (SDL_SYS_CDioctl(cdrom->id, CDIOCPLAYMSF, &playtime));
379
380
381
}
/* Pause play */
382
383
static int
SDL_SYS_CDPause(SDL_CD * cdrom)
384
{
385
return (SDL_SYS_CDioctl(cdrom->id, CDIOCPAUSE, 0));
386
387
388
}
/* Resume play */
389
390
static int
SDL_SYS_CDResume(SDL_CD * cdrom)
391
{
392
return (SDL_SYS_CDioctl(cdrom->id, CDIOCRESUME, 0));
393
394
395
}
/* Stop play */
396
397
static int
SDL_SYS_CDStop(SDL_CD * cdrom)
398
{
399
return (SDL_SYS_CDioctl(cdrom->id, CDIOCSTOP, 0));
400
401
402
}
/* Eject the CD-ROM */
403
404
static int
SDL_SYS_CDEject(SDL_CD * cdrom)
405
{
406
return (SDL_SYS_CDioctl(cdrom->id, CDIOCEJECT, 0));
407
408
409
}
/* Close the CD-ROM handle */
410
411
static void
SDL_SYS_CDClose(SDL_CD * cdrom)
412
{
413
close(cdrom->id);
414
415
}
416
417
void
SDL_SYS_CDQuit(void)
418
{
419
420
421
422
423
424
425
426
int i;
if (SDL_numcds > 0) {
for (i = 0; i < SDL_numcds; ++i) {
SDL_free(SDL_cdlist[i]);
}
SDL_numcds = 0;
}
427
428
}
429
#endif /* SDL_CDROM_OPENBSD */
430
/* vi: set ts=4 sw=4 expandtab: */