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SDL_syscdrom.c
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2006 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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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
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Lesser General Public License for more details.
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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
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Sam Lantinga
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slouken@libsdl.org
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*/
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#include "SDL_config.h"
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#ifdef SDL_CDROM_FREEBSD
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/* Functions for system-level CD-ROM audio control */
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <sys/cdio.h>
#include "SDL_cdrom.h"
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#include "../SDL_syscdrom.h"
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/* The maximum number of CD-ROM drives we'll detect */
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#define MAX_DRIVES 16
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/* 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);
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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);
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/* Some ioctl() errno values which occur when the tray is empty */
#define ERRNO_TRAYEMPTY(errno) \
((errno == EIO) || (errno == ENOENT) || (errno == EINVAL))
/* Check a drive to see if it is a CD-ROM */
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static int
CheckDrive(char *drive, struct stat *stbuf)
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{
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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);
}
}
return (is_cd);
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}
/* Add a CD-ROM drive to our list of valid drives */
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static void
AddDrive(char *drive, struct stat *stbuf)
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{
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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]) {
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#ifdef DEBUG_CDROM
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fprintf(stderr, "Duplicate drive detected: %s == %s\n",
drive, SDL_cdlist[i]);
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#endif
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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;
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#ifdef DEBUG_CDROM
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fprintf(stderr, "Added CD-ROM drive: %s\n", drive);
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#endif
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}
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}
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int
SDL_SYS_CDInit(void)
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{
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/* checklist: /dev/cdrom,/dev/cd?c /dev/acd?c
/dev/matcd?c /dev/mcd?c /dev/scd?c */
static char *checklist[] = {
"cdrom", "?0 cd?", "?0 acd?", "?0 matcd?", "?0 mcd?", "?0 scd?", NULL
};
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;
}
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} while (SDLcdrom);
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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/%sc",
&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);
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}
/* General ioctl() CD-ROM command function */
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static int
SDL_SYS_CDioctl(int id, int command, void *arg)
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{
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int retval;
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retval = ioctl(id, command, arg);
if (retval < 0) {
SDL_SetError("ioctl() error: %s", strerror(errno));
}
return (retval);
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}
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static const char *
SDL_SYS_CDName(int drive)
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{
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return (SDL_cdlist[drive]);
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}
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static int
SDL_SYS_CDOpen(int drive)
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{
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return (open(SDL_cdlist[drive], (O_RDONLY | O_EXCL | O_NONBLOCK), 0));
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}
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static int
SDL_SYS_CDGetTOC(SDL_CD * cdrom)
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{
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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);
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}
/* Get CD-ROM status */
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static CDstatus
SDL_SYS_CDStatus(SDL_CD * cdrom, int *position)
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{
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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);
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}
/* Start play */
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static int
SDL_SYS_CDPlay(SDL_CD * cdrom, int start, int length)
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{
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struct ioc_play_msf playtime;
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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);
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#ifdef DEBUG_CDROM
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fprintf(stderr, "Trying to play from %d:%d:%d to %d:%d:%d\n",
playtime.cdmsf_min0, playtime.cdmsf_sec0, playtime.cdmsf_frame0,
playtime.cdmsf_min1, playtime.cdmsf_sec1, playtime.cdmsf_frame1);
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#endif
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ioctl(cdrom->id, CDIOCSTART, 0);
return (SDL_SYS_CDioctl(cdrom->id, CDIOCPLAYMSF, &playtime));
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}
/* Pause play */
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static int
SDL_SYS_CDPause(SDL_CD * cdrom)
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{
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return (SDL_SYS_CDioctl(cdrom->id, CDIOCPAUSE, 0));
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}
/* Resume play */
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static int
SDL_SYS_CDResume(SDL_CD * cdrom)
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{
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return (SDL_SYS_CDioctl(cdrom->id, CDIOCRESUME, 0));
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}
/* Stop play */
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static int
SDL_SYS_CDStop(SDL_CD * cdrom)
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{
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return (SDL_SYS_CDioctl(cdrom->id, CDIOCSTOP, 0));
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}
/* Eject the CD-ROM */
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static int
SDL_SYS_CDEject(SDL_CD * cdrom)
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{
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return (SDL_SYS_CDioctl(cdrom->id, CDIOCEJECT, 0));
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}
/* Close the CD-ROM handle */
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static void
SDL_SYS_CDClose(SDL_CD * cdrom)
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{
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close(cdrom->id);
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}
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void
SDL_SYS_CDQuit(void)
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{
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int i;
if (SDL_numcds > 0) {
for (i = 0; i < SDL_numcds; ++i) {
SDL_free(SDL_cdlist[i]);
}
SDL_numcds = 0;
}
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}
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#endif /* SDL_CDROM_FREEBSD */
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/* vi: set ts=4 sw=4 expandtab: */