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SDL_syscdrom.c
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2004 Sam Lantinga
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This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Sam Lantinga
slouken@libsdl.org
*/
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#include "SDL_config.h"
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#ifdef SDL_CDROM_MINT
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/*
Atari MetaDOS CD-ROM functions
Patrice Mandin
*/
#include <errno.h>
#include <cdromio.h>
#include <metados.h>
#include "SDL_cdrom.h"
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#include "../SDL_syscdrom.h"
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/* Some ioctl() errno values which occur when the tray is empty */
#ifndef ENOMEDIUM
#define ENOMEDIUM ENOENT
#endif
#define ERRNO_TRAYEMPTY(errno) \
((errno == EIO) || (errno == ENOENT) || \
(errno == EINVAL) || (errno == ENOMEDIUM))
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/* The maximum number of CD-ROM drives we'll detect */
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#define MAX_DRIVES 32
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typedef struct
{
unsigned char device[3]; /* Physical device letter + ':' + '\0' */
metaopen_t metaopen; /* Infos on opened drive */
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} metados_drive_t;
static metados_drive_t metados_drives[MAX_DRIVES];
/* The system-dependent CD control functions */
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static const char *SDL_SYS_CDName (int drive);
static int SDL_SYS_CDOpen (int drive);
static void SDL_SYS_CDClose (SDL_CD * cdrom);
static int SDL_SYS_CDioctl (int id, int command, void *arg);
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);
int
SDL_SYS_CDInit (void)
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metainit_t metainit = { 0, 0, 0, 0 };
metaopen_t metaopen;
int i, handle;
struct cdrom_subchnl info;
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Metainit (&metainit);
if (metainit.version == NULL) {
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#ifdef DEBUG_CDROM
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fprintf (stderr, "MetaDOS not installed\n");
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#endif
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if (metainit.drives_map == 0) {
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#ifdef DEBUG_CDROM
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fprintf (stderr, "No MetaDOS devices present\n");
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#endif
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return -1;
}
SDL_numcds = 0;
for (i = 'A'; i <= 'Z'; i++) {
metados_drives[SDL_numcds].device[0] = 0;
metados_drives[SDL_numcds].device[1] = ':';
metados_drives[SDL_numcds].device[2] = 0;
if (metainit.drives_map & (1 << (i - 'A'))) {
handle = Metaopen (i, &metaopen);
if (handle == 0) {
info.cdsc_format = CDROM_MSF;
if ((Metaioctl
(i, METADOS_IOCTL_MAGIC, CDROMSUBCHNL, &info) == 0)
|| ERRNO_TRAYEMPTY (errno)) {
metados_drives[SDL_numcds].device[0] = i;
++SDL_numcds;
}
Metaclose (i);
}
}
}
/* Fill in our driver capabilities */
SDL_CDcaps.Name = SDL_SYS_CDName;
SDL_CDcaps.Open = SDL_SYS_CDOpen;
SDL_CDcaps.Close = SDL_SYS_CDClose;
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;
return 0;
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}
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void
SDL_SYS_CDQuit (void)
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SDL_numcds = 0;
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}
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static const char *
SDL_SYS_CDName (int drive)
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return (metados_drives[drive].device);
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}
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static int
SDL_SYS_CDOpen (int drive)
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handle =
Metaopen (metados_drives[drive].device[0],
&(metados_drives[drive].metaopen));
if (handle == 0) {
return drive;
}
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}
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static void
SDL_SYS_CDClose (SDL_CD * cdrom)
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Metaclose (metados_drives[cdrom->id].device[0]);
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}
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static int
SDL_SYS_CDioctl (int id, int command, void *arg)
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int retval;
retval =
Metaioctl (metados_drives[id].device[0], METADOS_IOCTL_MAGIC, command,
arg);
if (retval < 0) {
SDL_SetError ("ioctl() error: %s", strerror (errno));
}
return (retval);
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}
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static int
SDL_SYS_CDGetTOC (SDL_CD * cdrom)
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int i, okay;
struct cdrom_tochdr toc;
struct cdrom_tocentry entry;
/* Use standard ioctl() */
if (SDL_SYS_CDioctl (cdrom->id, CDROMREADTOCHDR, &toc) < 0) {
return -1;
}
cdrom->numtracks = toc.cdth_trk1 - toc.cdth_trk0 + 1;
if (cdrom->numtracks > SDL_MAX_TRACKS) {
cdrom->numtracks = SDL_MAX_TRACKS;
}
/* Read all the track TOC entries */
okay = 1;
for (i = 0; i <= cdrom->numtracks; ++i) {
if (i == cdrom->numtracks) {
cdrom->track[i].id = CDROM_LEADOUT;
} else {
cdrom->track[i].id = toc.cdth_trk0 + i;
}
entry.cdte_track = cdrom->track[i].id;
entry.cdte_format = CDROM_MSF;
if (SDL_SYS_CDioctl (cdrom->id, CDROMREADTOCENTRY, &entry) < 0) {
okay = 0;
break;
} else {
if (entry.cdte_ctrl & CDROM_DATA_TRACK) {
cdrom->track[i].type = SDL_DATA_TRACK;
} else {
cdrom->track[i].type = SDL_AUDIO_TRACK;
}
cdrom->track[i].offset =
MSF_TO_FRAMES (entry.cdte_addr.msf.minute,
entry.cdte_addr.msf.second,
entry.cdte_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;
}
}
}
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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CDstatus status;
struct cdrom_tochdr toc;
struct cdrom_subchnl info;
info.cdsc_format = CDROM_MSF;
if (SDL_SYS_CDioctl (cdrom->id, CDROMSUBCHNL, &info) < 0) {
if (ERRNO_TRAYEMPTY (errno)) {
status = CD_TRAYEMPTY;
} else {
status = CD_ERROR;
}
} else {
switch (info.cdsc_audiostatus) {
case CDROM_AUDIO_INVALID:
case CDROM_AUDIO_NO_STATUS:
/* Try to determine if there's a CD available */
if (SDL_SYS_CDioctl (cdrom->id, CDROMREADTOCHDR, &toc) == 0) {
status = CD_STOPPED;
} else {
status = CD_TRAYEMPTY;
}
break;
case CDROM_AUDIO_COMPLETED:
status = CD_STOPPED;
break;
case CDROM_AUDIO_PLAY:
status = CD_PLAYING;
break;
case CDROM_AUDIO_PAUSED:
/* Workaround buggy CD-ROM drive */
if (info.cdsc_trk == CDROM_LEADOUT) {
status = CD_STOPPED;
} else {
status = CD_PAUSED;
}
break;
default:
status = CD_ERROR;
break;
}
}
if (position) {
if (status == CD_PLAYING || (status == CD_PAUSED)) {
*position = MSF_TO_FRAMES (info.cdsc_absaddr.msf.minute,
info.cdsc_absaddr.msf.second,
info.cdsc_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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struct cdrom_msf playtime;
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FRAMES_TO_MSF (start,
&playtime.cdmsf_min0, &playtime.cdmsf_sec0,
&playtime.cdmsf_frame0);
FRAMES_TO_MSF (start + length, &playtime.cdmsf_min1, &playtime.cdmsf_sec1,
&playtime.cdmsf_frame1);
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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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return SDL_SYS_CDioctl (cdrom->id, CDROMPLAYMSF, &playtime);
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}
/* Pause play */
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static int
SDL_SYS_CDPause (SDL_CD * cdrom)
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return SDL_SYS_CDioctl (cdrom->id, CDROMPAUSE, 0);
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}
/* Resume play */
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static int
SDL_SYS_CDResume (SDL_CD * cdrom)
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return SDL_SYS_CDioctl (cdrom->id, CDROMRESUME, 0);
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}
/* Stop play */
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static int
SDL_SYS_CDStop (SDL_CD * cdrom)
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return SDL_SYS_CDioctl (cdrom->id, CDROMSTOP, 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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return SDL_SYS_CDioctl (cdrom->id, CDROMEJECT, 0);
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#endif /* SDL_CDROM_MINT */
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/* vi: set ts=4 sw=4 expandtab: */