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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#include "SDL_config.h"
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/*
* Functions for system-level CD-ROM audio control for BSD/OS 4.x
* This started life out as a copy of the freebsd/SDL_cdrom.c file but was
* heavily modified. Works for standard (MMC) SCSI and ATAPI CDrom drives.
*
* Steven Schultz - sms@to.gd-es.com
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <err.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include </sys/dev/scsi/scsi.h>
#include </sys/dev/scsi/scsi_ioctl.h>
#include "SDL_cdrom.h"
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#include "../SDL_syscdrom.h"
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/*
* The msf_to_frame and frame_to_msf were yanked from libcdrom and inlined
* here so that -lcdrom doesn't have to be dragged in for something so simple.
*/
#define FRAMES_PER_SECOND 75
#define FRAMES_PER_MINUTE (FRAMES_PER_SECOND * 60)
int
msf_to_frame(int minute, int second, int frame)
{
return(minute * FRAMES_PER_MINUTE + second * FRAMES_PER_SECOND + frame);
}
void
frame_to_msf(int frame, int *minp, int *secp, int *framep)
{
*minp = frame / FRAMES_PER_MINUTE;
*secp = (frame % FRAMES_PER_MINUTE) / FRAMES_PER_SECOND;
*framep = frame % FRAMES_PER_SECOND;
}
/* The maximum number of CD-ROM drives we'll detect */
#define MAX_DRIVES 16
/* 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);
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);
typedef struct scsi_cdb cdb_t;
static int scsi_cmd(int fd,
struct scsi_cdb *cdb,
int cdblen,
int rw,
caddr_t data,
int datalen,
struct scsi_user_cdb *sus)
{
int scsistatus;
unsigned char *cp;
struct scsi_user_cdb suc;
/* safety checks */
if (!cdb) return(-1);
if (rw != SUC_READ && rw != SUC_WRITE) return(-1);
suc.suc_flags = rw;
suc.suc_cdblen = cdblen;
bcopy(cdb, suc.suc_cdb, cdblen);
suc.suc_datalen = datalen;
suc.suc_data = data;
suc.suc_timeout = 10; /* 10 secs max for TUR or SENSE */
if (ioctl(fd, SCSIRAWCDB, &suc) == -1)
return(-11);
scsistatus = suc.suc_sus.sus_status;
cp = suc.suc_sus.sus_sense;
/*
* If a place to copy the sense data back to has been provided then the
* caller is responsible for checking the errors and printing any information
* out if the status was not successful.
*/
if (scsistatus != 0 && !sus)
{
fprintf(stderr,"scsistatus = %x cmd = %x\n",
scsistatus, cdb[0]);
fprintf(stderr, "sense %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x\n",
cp[0], cp[1], cp[2], cp[3], cp[4], cp[5],
cp[6], cp[7], cp[8], cp[9], cp[10], cp[11],
cp[12], cp[13], cp[14], cp[15]);
return(1);
}
if (sus)
bcopy(&suc, sus, sizeof (struct scsi_user_cdb));
if (scsistatus)
return(1); /* Return non-zero for unsuccessful status */
return(0);
}
/* request vendor brand and model */
unsigned char *Inquiry(int fd)
{
static struct scsi_cdb6 cdb =
{
0x12,
0, 0, 0,
56,
0
};
static unsigned char Inqbuffer[56];
if (scsi_cmd(fd, (cdb_t *)&cdb, 6, SUC_READ, Inqbuffer,
sizeof(Inqbuffer), 0))
return("\377");
return(Inqbuffer);
}
#define ADD_SENSECODE 12
#define ADD_SC_QUALIFIER 13
int TestForMedium(int fd)
{
int sts, asc, ascq;
struct scsi_user_cdb sus;
static struct scsi_cdb6 cdb =
{
CMD_TEST_UNIT_READY, /* command */
0, /* reserved */
0, /* reserved */
0, /* reserved */
0, /* reserved */
0 /* reserved */
};
again: sts = scsi_cmd(fd, (cdb_t *)&cdb, 6, SUC_READ, 0, 0, &sus);
asc = sus.suc_sus.sus_sense[ADD_SENSECODE];
ascq = sus.suc_sus.sus_sense[ADD_SC_QUALIFIER];
if (asc == 0x3a && ascq == 0x0) /* no medium */
return(0);
if (asc == 0x28 && ascq == 0x0) /* medium changed */
goto again;
if (asc == 0x4 && ascq == 0x1 ) /* coming ready */
{
sleep(2);
goto again;
}
return(1);
}
/* Check a drive to see if it is a CD-ROM */
static int CheckDrive(char *drive, struct stat *stbuf)
{
int is_cd = 0, cdfd;
char *p;
/* 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 */
cdfd = open(drive, (O_RDONLY|O_EXCL|O_NONBLOCK), 0);
if ( cdfd >= 0 ) {
p = Inquiry(cdfd);
if (*p == TYPE_ROM)
is_cd = 1;
close(cdfd);
}
return(is_cd);
}
/* Add a CD-ROM drive to our list of valid drives */
static void AddDrive(char *drive, struct stat *stbuf)
{
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] ) {
#ifdef DEBUG_CDROM
fprintf(stderr, "Duplicate drive detected: %s == %s\n", drive, SDL_cdlist[i]);
#endif
return;
}
}
/* Add this drive to our list */
i = SDL_numcds;
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SDL_cdlist[i] = SDL_strdup(drive);
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if ( SDL_cdlist[i] == NULL ) {
SDL_OutOfMemory();
return;
}
SDL_cdmode[i] = stbuf->st_rdev;
++SDL_numcds;
#ifdef DEBUG_CDROM
fprintf(stderr, "Added CD-ROM drive: %s\n", drive);
#endif
}
}
int SDL_SYS_CDInit(void)
{
/* checklist: /dev/rsr?c */
static char *checklist[] = {
"?0 rsr?", 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 */
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SDLcdrom = SDL_getenv("SDL_CDROM"); /* ':' separated list of devices */
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if ( SDLcdrom != NULL ) {
char *cdpath, *delim;
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size_t len = SDL_strlen(SDLcdrom)+1;
cdpath = SDL_stack_alloc(char, len);
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if ( cdpath != NULL ) {
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SDL_strlcpy(cdpath, SDLcdrom, len);
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SDLcdrom = cdpath;
do {
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delim = SDL_strchr(SDLcdrom, ':');
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if ( delim ) {
*delim++ = '\0';
}
if ( CheckDrive(SDLcdrom, &stbuf) > 0 ) {
AddDrive(SDLcdrom, &stbuf);
}
if ( delim ) {
SDLcdrom = delim;
} else {
SDLcdrom = NULL;
}
} while ( SDLcdrom );
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SDL_stack_free(cdpath);
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}
/* 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 ) {
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SDL_snprintf(drive, SDL_arraysize(drive), "/dev/%sc", &checklist[i][3]);
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insert = SDL_strchr(drive, '?');
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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 {
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SDL_snprintf(drive, SDL_arraysize(drive), "/dev/%s", checklist[i]);
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if ( CheckDrive(drive, &stbuf) > 0 ) {
AddDrive(drive, &stbuf);
}
}
}
return(0);
}
static const char *SDL_SYS_CDName(int drive)
{
return(SDL_cdlist[drive]);
}
static int SDL_SYS_CDOpen(int drive)
{
return(open(SDL_cdlist[drive], O_RDONLY | O_NONBLOCK | O_EXCL, 0));
}
static int SDL_SYS_CDGetTOC(SDL_CD *cdrom)
{
u_char cdb[10], buf[4], *p, *toc;
struct scsi_user_cdb sus;
int i, sts, first_track, last_track, ntracks, toc_size;
bzero(cdb, sizeof (cdb));
cdb[0] = 0x43; /* Read TOC */
cdb[1] = 0x2; /* MSF */
cdb[8] = 4; /* size TOC header */
sts = scsi_cmd(cdrom->id, (cdb_t *)cdb, 10, SUC_READ, buf, 4, &sus);
if (sts < 0)
return(-1);
first_track = buf[2];
last_track = buf[3];
ntracks = last_track - first_track + 1;
cdrom->numtracks = ntracks;
toc_size = 4 + (ntracks + 1) * 8;
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toc = (u_char *)SDL_malloc(toc_size);
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if (toc == NULL)
return(-1);
bzero(cdb, sizeof (cdb));
cdb[0] = 0x43;
cdb[1] = 0x2;
cdb[6] = first_track;
cdb[7] = toc_size >> 8;
cdb[8] = toc_size & 0xff;
sts = scsi_cmd(cdrom->id, (cdb_t *)cdb, 10, SUC_READ, toc, toc_size,
&sus);
if (sts < 0)
{
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SDL_free(toc);
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return(-1);
}
for (i = 0, p = toc+4; i <= ntracks; i++, p+= 8)
{
if (i == ntracks)
cdrom->track[i].id = 0xAA; /* Leadout */
else
cdrom->track[i].id = first_track + i;
if (p[1] & 0x20)
cdrom->track[i].type = SDL_DATA_TRACK;
else
cdrom->track[i].type = SDL_AUDIO_TRACK;
cdrom->track[i].offset = msf_to_frame(p[5], p[6], p[7]);
cdrom->track[i].length = 0;
if (i > 0)
cdrom->track[i-1].length = cdrom->track[i].offset -
cdrom->track[i-1].offset;
}
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SDL_free(toc);
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return(0);
}
/* Get CD-ROM status */
static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position)
{
CDstatus status;
u_char cdb[10], buf[16];
int sts;
struct scsi_user_cdb sus;
bzero(cdb, sizeof (cdb));
cdb[0] = 0x42; /* read subq */
cdb[1] = 0x2; /* MSF */
cdb[2] = 0x40; /* q channel */
cdb[3] = 1; /* current pos */
cdb[7] = sizeof (buf) >> 8;
cdb[8] = sizeof (buf) & 0xff;
sts = scsi_cmd(cdrom->id, (cdb_t *)cdb, 10, SUC_READ, buf, sizeof (buf),
&sus);
if (sts < 0)
return(-1);
if (sts)
{
if (TestForMedium(cdrom->id) == 0)
status = CD_TRAYEMPTY;
else
status = CD_ERROR;
}
else
{
switch (buf[1])
{
case 0x11:
status = CD_PLAYING;
break;
case 0x12:
status = CD_PAUSED;
break;
case 0x13:
case 0x14:
case 0x15:
status = CD_STOPPED;
break;
default:
status = CD_ERROR;
break;
}
}
if (position)
{
if ( status == CD_PLAYING || (status == CD_PAUSED) )
*position = msf_to_frame(buf[9], buf[10], buf[11]);
else
*position = 0;
}
return(status);
}
/* Start play */
static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length)
{
u_char cdb[10];
int sts, minute, second, frame, eminute, esecond, eframe;
struct scsi_user_cdb sus;
bzero(cdb, sizeof(cdb));
cdb[0] = 0x47; /* Play */
frame_to_msf(start, &minute, &second, &frame);
frame_to_msf(start + length, &eminute, &esecond, &eframe);
cdb[3] = minute;
cdb[4] = second;
cdb[5] = frame;
cdb[6] = eminute;
cdb[7] = esecond;
cdb[8] = eframe;
sts = scsi_cmd(cdrom->id, (cdb_t *)cdb, 10, SUC_READ, 0, 0, &sus);
return(sts);
}
static int
pauseresume(SDL_CD *cdrom, int flag)
{
u_char cdb[10];
struct scsi_user_cdb sus;
bzero(cdb, sizeof (cdb));
cdb[0] = 0x4b;
cdb[8] = flag & 0x1;
return(scsi_cmd(cdrom->id, (cdb_t *)cdb, 10, SUC_READ, 0, 0, &sus));
}
/* Pause play */
static int SDL_SYS_CDPause(SDL_CD *cdrom)
{
return(pauseresume(cdrom, 0));
}
/* Resume play */
static int SDL_SYS_CDResume(SDL_CD *cdrom)
{
return(pauseresume(cdrom, 1));
}
/* Stop play */
static int SDL_SYS_CDStop(SDL_CD *cdrom)
{
u_char cdb[6];
struct scsi_user_cdb sus;
bzero(cdb, sizeof (cdb));
cdb[0] = 0x1b; /* stop */
cdb[1] = 1; /* immediate */
return(scsi_cmd(cdrom->id, (cdb_t *)cdb, 6, SUC_READ, 0, 0, &sus));
}
/* Eject the CD-ROM */
static int SDL_SYS_CDEject(SDL_CD *cdrom)
{
u_char cdb[6];
struct scsi_user_cdb sus;
bzero(cdb, sizeof (cdb));
cdb[0] = 0x1b; /* stop */
cdb[1] = 1; /* immediate */
cdb[4] = 2; /* eject */
return(scsi_cmd(cdrom->id, (cdb_t *)cdb, 6, SUC_READ, 0, 0, &sus));
}
/* Close the CD-ROM handle */
static void SDL_SYS_CDClose(SDL_CD *cdrom)
{
close(cdrom->id);
}
void SDL_SYS_CDQuit(void)
{
int i;
if ( SDL_numcds > 0 ) {
for ( i=0; i<SDL_numcds; ++i ) {
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SDL_free(SDL_cdlist[i]);
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}
}
SDL_numcds = 0;
}