/*

SDL - Simple DirectMedia Layer

Copyright (C) 1997-2006 Sam Lantinga

This library is free software; you can redistribute it and/or

modify it under the terms of the GNU Lesser General Public

License as published by the Free Software Foundation; either

version 2.1 of the License, or (at your option) any later version.

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

Lesser General Public License for more details.

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

Sam Lantinga

slouken@libsdl.org

*/

/*

* 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_stdlib.h"

#include "SDL_string.h"

#include "SDL_error.h"

#include "SDL_cdrom.h"

#include "SDL_syscdrom.h"

/*

* 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_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;

SDL_cdlist[i] = (char *)SDL_malloc(SDL_strlen(drive)+1);

if ( SDL_cdlist[i] == NULL ) {

SDL_OutOfMemory();

return;

}

SDL_strcpy(SDL_cdlist[i], drive);

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 */

SDLcdrom = SDL_getenv("SDL_CDROM"); /* ':' separated list of devices */

if ( SDLcdrom != NULL ) {

char *cdpath, *delim;

cdpath = SDL_malloc(SDL_strlen(SDLcdrom)+1);

if ( cdpath != NULL ) {

SDL_strcpy(cdpath, SDLcdrom);

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;

}

} while ( SDLcdrom );

SDL_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);

}

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;

toc = (u_char *)SDL_malloc(toc_size);

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)

{

SDL_free(toc);

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;

}

SDL_free(toc);

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 ) {

SDL_free(SDL_cdlist[i]);

}

}

SDL_numcds = 0;

}