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SDL_syscdrom.cc
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2009 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_BEOS
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/* Functions for system-level CD-ROM audio control on BeOS
(not completely implemented yet)
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <scsi.h>
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#include <Directory.h>
#include <Entry.h>
#include <Path.h>
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#include "SDL_cdrom.h"
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extern "C"
{
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#include "../SDL_syscdrom.h"
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}
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/* Constants to help us get at the SCSI table-of-contents info */
#define CD_NUMTRACKS(toc) toc.toc_data[3]
#define CD_TRACK(toc, track) (&toc.toc_data[6+(track)*8])
#define CD_TRACK_N(toc, track) CD_TRACK(toc, track)[0]
#define CD_TRACK_M(toc, track) CD_TRACK(toc, track)[3]
#define CD_TRACK_S(toc, track) CD_TRACK(toc, track)[4]
#define CD_TRACK_F(toc, track) CD_TRACK(toc, track)[5]
/* Constants to help us get at the SCSI position info */
#define POS_TRACK(pos) pos.position[6]
#define POS_ABS_M(pos) pos.position[9]
#define POS_ABS_S(pos) pos.position[10]
#define POS_ABS_F(pos) pos.position[11]
#define POS_REL_M(pos) pos.position[13]
#define POS_REL_S(pos) pos.position[14]
#define POS_REL_F(pos) pos.position[15]
/* 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];
/* 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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int try_dir(const char *directory);
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/* Check a drive to see if it is a CD-ROM */
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static int
CheckDrive(char *drive)
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{
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struct stat stbuf;
int is_cd, cdfd;
device_geometry 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;
cdfd = open(drive, 0);
if (cdfd >= 0) {
if (ioctl(cdfd, B_GET_GEOMETRY, &info) == B_NO_ERROR) {
if (info.device_type == B_CD) {
is_cd = 1;
}
}
close(cdfd);
} else {
/* This can happen when the drive is open .. (?) */ ;
is_cd = 1;
}
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)
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{
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int i;
size_t len;
if (SDL_numcds < MAX_DRIVES) {
/* Add this drive to our list */
i = SDL_numcds;
len = SDL_strlen(drive) + 1;
SDL_cdlist[i] = (char *) SDL_malloc(len);
if (SDL_cdlist[i] == NULL) {
SDL_OutOfMemory();
return;
}
SDL_strlcpy(SDL_cdlist[i], drive, len);
++SDL_numcds;
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#ifdef CDROM_DEBUG
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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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}
/* IDE bus scanning magic */
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enum
{
IDE_GET_DEVICES_INFO = B_DEVICE_OP_CODES_END + 50,
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};
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struct ide_ctrl_info
{
bool ide_0_present;
bool ide_0_master_present;
bool ide_0_slave_present;
int ide_0_master_type;
int ide_0_slave_type;
bool ide_1_present;
bool ide_1_master_present;
bool ide_1_slave_present;
int ide_1_master_type;
int ide_1_slave_type;
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};
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int
SDL_SYS_CDInit(void)
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{
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char *SDLcdrom;
int raw_fd;
struct ide_ctrl_info info;
/* 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) > 0) {
AddDrive(SDLcdrom);
}
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 */
try_dir("/dev/disk");
return 0;
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}
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int
try_dir(const char *directory)
{
BDirectory dir;
dir.SetTo(directory);
if (dir.InitCheck() != B_NO_ERROR) {
return false;
}
dir.Rewind();
BEntry entry;
while (dir.GetNextEntry(&entry) >= 0) {
BPath path;
const char *name;
entry_ref e;
if (entry.GetPath(&path) != B_NO_ERROR)
continue;
name = path.Path();
if (entry.GetRef(&e) != B_NO_ERROR)
continue;
if (entry.IsDirectory()) {
if (SDL_strcmp(e.name, "floppy") == 0)
continue; /* ignore floppy (it is not silent) */
int devfd = try_dir(name);
if (devfd >= 0)
return devfd;
} else {
int devfd;
device_geometry g;
if (SDL_strcmp(e.name, "raw") != 0)
continue; /* ignore partitions */
devfd = open(name, O_RDONLY);
if (devfd < 0)
continue;
if (ioctl(devfd, B_GET_GEOMETRY, &g, sizeof(g)) >= 0) {
if (g.device_type == B_CD) {
AddDrive(strdup(name));
}
}
close(devfd);
}
}
return B_ERROR;
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}
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/* General ioctl() CD-ROM command function */
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static int
SDL_SYS_CDioctl(int index, int command, void *arg)
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{
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int okay;
int fd;
okay = 0;
fd = open(SDL_cdlist[index], 0);
if (fd >= 0) {
if (ioctl(fd, command, arg) == B_NO_ERROR) {
okay = 1;
}
close(fd);
}
return (okay ? 0 : -1);
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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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static int
SDL_SYS_CDOpen(int drive)
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{
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return (drive);
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}
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static int
SDL_SYS_CDGetTOC(SDL_CD * cdrom)
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{
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int i;
scsi_toc toc;
if (SDL_SYS_CDioctl(cdrom->id, B_SCSI_GET_TOC, &toc) == 0) {
cdrom->numtracks = CD_NUMTRACKS(toc);
if (cdrom->numtracks > SDL_MAX_TRACKS) {
cdrom->numtracks = SDL_MAX_TRACKS;
}
for (i = 0; i <= cdrom->numtracks; ++i) {
cdrom->track[i].id = CD_TRACK_N(toc, i);
/* FIXME: How do we tell on BeOS? */
cdrom->track[i].type = SDL_AUDIO_TRACK;
cdrom->track[i].offset = MSF_TO_FRAMES(CD_TRACK_M(toc, i),
CD_TRACK_S(toc, i),
CD_TRACK_F(toc, i));
cdrom->track[i].length = 0;
if (i > 0) {
cdrom->track[i - 1].length =
cdrom->track[i].offset - cdrom->track[i - 1].offset;
}
}
return (0);
} else {
return (-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;
int fd;
int cur_frame;
scsi_position pos;
fd = open(SDL_cdlist[cdrom->id], 0);
cur_frame = 0;
if (fd >= 0) {
if (ioctl(fd, B_SCSI_GET_POSITION, &pos) == B_NO_ERROR) {
cur_frame =
MSF_TO_FRAMES(POS_ABS_M(pos), POS_ABS_S(pos), POS_ABS_F(pos));
}
if (!pos.position[1] || (pos.position[1] >= 0x13) ||
((pos.position[1] == 0x12) && (!pos.position[6]))) {
status = CD_STOPPED;
} else if (pos.position[1] == 0x11) {
status = CD_PLAYING;
} else {
status = CD_PAUSED;
}
close(fd);
} else {
status = CD_TRAYEMPTY;
}
if (position) {
*position = cur_frame;
}
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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int okay;
int fd;
scsi_play_position pos;
okay = 0;
fd = open(SDL_cdlist[cdrom->id], 0);
if (fd >= 0) {
FRAMES_TO_MSF(start, &pos.start_m, &pos.start_s, &pos.start_f);
FRAMES_TO_MSF(start + length, &pos.end_m, &pos.end_s, &pos.end_f);
if (ioctl(fd, B_SCSI_PLAY_POSITION, &pos) == B_NO_ERROR) {
okay = 1;
}
close(fd);
}
return (okay ? 0 : -1);
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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, B_SCSI_PAUSE_AUDIO, 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, B_SCSI_RESUME_AUDIO, 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, B_SCSI_STOP_AUDIO, 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, B_SCSI_EJECT, 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_BEOS */
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/* vi: set ts=4 sw=4 expandtab: */