SDL_syscdrom.cc
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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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/* 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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#include "../SDL_syscdrom.h"
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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 */
#define MAX_DRIVES 16
/* 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);
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 */
static int CheckDrive(char *drive)
{
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);
}
/* Add a CD-ROM drive to our list of valid drives */
static void AddDrive(char *drive)
{
int i;
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size_t len;
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if ( SDL_numcds < MAX_DRIVES ) {
/* Add this drive to our list */
i = SDL_numcds;
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len = SDL_strlen(drive)+1;
SDL_cdlist[i] = (char *)SDL_malloc(len);
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if ( SDL_cdlist[i] == NULL ) {
SDL_OutOfMemory();
return;
}
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SDL_strlcpy(SDL_cdlist[i], drive, len);
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++SDL_numcds;
#ifdef CDROM_DEBUG
fprintf(stderr, "Added CD-ROM drive: %s\n", drive);
#endif
}
}
/* IDE bus scanning magic */
enum {
IDE_GET_DEVICES_INFO = B_DEVICE_OP_CODES_END + 50,
};
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;
};
int SDL_SYS_CDInit(void)
{
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 */
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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) > 0 ) {
AddDrive(SDLcdrom);
}
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);
}
}
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/* Scan the system for CD-ROM drives */
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try_dir("/dev/disk");
return 0;
}
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()) {
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if(SDL_strcmp(e.name, "floppy") == 0)
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continue; /* ignore floppy (it is not silent) */
int devfd = try_dir(name);
if(devfd >= 0)
return devfd;
}
else {
int devfd;
device_geometry g;
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if(SDL_strcmp(e.name, "raw") != 0)
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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));
}
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}
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close(devfd);
}
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}
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return B_ERROR;
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}
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/* General ioctl() CD-ROM command function */
static int SDL_SYS_CDioctl(int index, int command, void *arg)
{
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);
}
static const char *SDL_SYS_CDName(int drive)
{
return(SDL_cdlist[drive]);
}
static int SDL_SYS_CDOpen(int drive)
{
return(drive);
}
static int SDL_SYS_CDGetTOC(SDL_CD *cdrom)
{
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);
}
}
/* Get CD-ROM status */
static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position)
{
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);
}
/* Start play */
static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length)
{
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);
}
/* Pause play */
static int SDL_SYS_CDPause(SDL_CD *cdrom)
{
return(SDL_SYS_CDioctl(cdrom->id, B_SCSI_PAUSE_AUDIO, 0));
}
/* Resume play */
static int SDL_SYS_CDResume(SDL_CD *cdrom)
{
return(SDL_SYS_CDioctl(cdrom->id, B_SCSI_RESUME_AUDIO, 0));
}
/* Stop play */
static int SDL_SYS_CDStop(SDL_CD *cdrom)
{
return(SDL_SYS_CDioctl(cdrom->id, B_SCSI_STOP_AUDIO, 0));
}
/* Eject the CD-ROM */
static int SDL_SYS_CDEject(SDL_CD *cdrom)
{
return(SDL_SYS_CDioctl(cdrom->id, B_SCSI_EJECT, 0));
}
/* Close the CD-ROM handle */
static void SDL_SYS_CDClose(SDL_CD *cdrom)
{
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close(cdrom->id);
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}
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;
}
}