src/cdrom/qnx/SDL_syscdrom.c

/*
    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
*/
#include "SDL_config.h"

#ifdef SDL_CDROM_QNX

/* Functions for system-level CD-ROM audio control */

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <sys/cdrom.h>
#include <sys/dcmd_cam.h>

#include "SDL_timer.h"
#include "SDL_cdrom.h"
#include "../SDL_syscdrom.h"

/* The maximum number of CD-ROM drives we'll detect */
#define MAX_DRIVES 16

#define QNX_CD_OPENMODE O_RDONLY | O_EXCL

/* A list of available CD-ROM drives */
static char *SDL_cdlist[MAX_DRIVES];
static dev_t SDL_cdmode[MAX_DRIVES];
static int SDL_cdopen[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);

/* Check a drive to see if it is a CD-ROM */
static int
CheckDrive(char *drive, struct stat *stbuf)
{
    int is_cd, cdfd;
    cam_devinfo_t dinfo;
    int devctlret = 0;

    int atapi;
    int removable;
    int cdb10;

    /* 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;

    if (S_ISCHR(stbuf->st_mode) || S_ISBLK(stbuf->st_mode)) {
        cdfd = open(drive, QNX_CD_OPENMODE);
        if (cdfd >= 0) {
            devctlret =
                devctl(cdfd, DCMD_CAM_DEVINFO, &dinfo,
                       sizeof(cam_devinfo_t), NULL);

            if (devctlret == EOK) {
                atapi = dinfo.flags & DEV_ATAPI;
                removable = dinfo.flags & DEV_REMOVABLE;
                cdb10 = dinfo.flags & DEV_CDB_10;       /* I'm not sure about that flag */

                /* in the near future need to add more checks for splitting cdroms from other devices */
                if ((atapi) && (removable)) {
                    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]) {
                return;
            }
        }

        /* Add this drive to our list */

        i = SDL_numcds;
        SDL_cdlist[i] = SDL_strdup(drive);
        if (SDL_cdlist[i] == NULL) {
            SDL_OutOfMemory();
            return;
        }
        SDL_cdmode[i] = stbuf->st_rdev;
        ++SDL_numcds;
    }
}

int
SDL_SYS_CDInit(void)
{
    /* checklist: /dev/cdrom, /dev/cd?, /dev/scd? */
    static char *checklist[] =
        { "cdrom", "?0 cd?", "?1 cd?", "?0 scd?", 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;

    /* clearing device open status */
    for (i = 0; i < MAX_DRIVES; i++) {
        SDL_cdopen[i] = 0;
    }

    /* 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, &stbuf) > 0) {
                    AddDrive(SDLcdrom, &stbuf);
                }
                if (delim) {
                    SDLcdrom = delim;
                } else {
                    SDLcdrom = NULL;
                }
            } while (SDLcdrom);
            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 */
    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/%s",
                             &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)
{
    int handle;

    handle = open(SDL_cdlist[drive], QNX_CD_OPENMODE);

    if (handle > 0) {
        SDL_cdopen[drive] = handle;
    }

    return (handle);
}

static int
SDL_SYS_CDGetTOC(SDL_CD * cdrom)
{
    cdrom_read_toc_t toc;
    int i, okay;

    okay = 0;
    if (devctl(cdrom->id, DCMD_CAM_CDROMREADTOC, &toc, sizeof(toc), NULL) ==
        0) {
        cdrom->numtracks = toc.last_track - toc.first_track + 1;
        if (cdrom->numtracks > SDL_MAX_TRACKS) {
            cdrom->numtracks = SDL_MAX_TRACKS;
        }
        /* Read all the track TOC entries */
        for (i = 0; i <= cdrom->numtracks; ++i) {
            if (i == cdrom->numtracks) {
                cdrom->track[i].id = CDROM_LEADOUT;
            } else {
                cdrom->track[i].id = toc.first_track + i;
            }

            cdrom->track[i].type = toc.toc_entry[i].control_adr & 0x0F;
            cdrom->track[i].offset = toc.toc_entry[i].addr.lba;
            cdrom->track[i].length = 0;

            if (i > 0) {
                cdrom->track[i - 1].length =
                    cdrom->track[i].offset - cdrom->track[i - 1].offset;
            }
        }
        if (i == (cdrom->numtracks + 1)) {
            okay = 1;
        }
    }
    return (okay ? 0 : -1);
}

/* Get CD-ROM status */
static CDstatus
SDL_SYS_CDStatus(SDL_CD * cdrom, int *position)
{
    CDstatus status;

    cdrom_read_toc_t toc;
    cdrom_subch_data_t info;
    cam_devinfo_t dinfo;

    int devctlret = 0;
    int drive = -1;
    int i;
    int eagaincnt = 0;

    /* check media presence before read subchannel call, some cdroms can lockups */
    /* if no media, while calling read subchannel functions.                     */
    devctlret =
        devctl(cdrom->id, DCMD_CAM_DEVINFO, &dinfo, sizeof(cam_devinfo_t),
               NULL);

    if (devctlret == EOK) {
        if ((dinfo.flags & DEV_NO_MEDIA) != 0) {
            status = CD_TRAYEMPTY;
            if (position) {
                *position = 0;
            }
            return (status);
        }
    }

    /* if media exists, then do other stuff */

    SDL_memset(&info, 0x00, sizeof(info));
    info.subch_command.data_format = CDROM_SUBCH_CURRENT_POSITION;

    do {
        devctlret =
            devctl(cdrom->id, DCMD_CAM_CDROMSUBCHNL, &info, sizeof(info),
                   NULL);
        if (devctlret == EIO) {
            /* big workaround for media change, handle is unusable after that,
               that bug was found in QNX 6.2, 6.2.1 is not released yet.    */

            for (i = 0; i < MAX_DRIVES; i++) {
                if (SDL_cdopen[i] == cdrom->id) {
                    drive = i;
                    break;
                }
            }
            if (drive == -1) {
                /* that cannot happen, but ... */
                break;
            }
            close(cdrom->id);
            cdrom->id = open(SDL_cdlist[drive], QNX_CD_OPENMODE);
            devctlret = EAGAIN;
        }
        if (devctlret == EAGAIN) {
            eagaincnt++;
        }
        if (eagaincnt == 2) {
            /* workaround for broken cdroms, which can return always EAGAIN when its not ready, */
            /* that mean errornous media or just no media avail                                 */
            devctlret = ENXIO;
            break;
        }
    } while ((devctlret == EAGAIN) || (devctlret == ESTALE));

    if (devctlret != 0) {
        if (devctlret == ENXIO) {
            status = CD_TRAYEMPTY;
        } else {
            status = CD_ERROR;
        }
    } else {
        switch (info.current_position.header.audio_status) {
        case CDROM_AUDIO_INVALID:
        case CDROM_AUDIO_NO_STATUS:
            /* Try to determine if there's a CD available */
            if (devctl
                (cdrom->id, DCMD_CAM_CDROMREADTOC, &toc, sizeof(toc),
                 NULL) == 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.current_position.data_format == 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.current_position.addr.msf.minute,
                              info.current_position.addr.msf.second,
                              info.current_position.addr.msf.frame);
        } else {
            *position = 0;
        }
    }

    return (status);
}

/* Start play */
static int
SDL_SYS_CDPlay(SDL_CD * cdrom, int start, int length)
{
    cdrom_playmsf_t playtime;

    FRAMES_TO_MSF(start, &playtime.start_minute, &playtime.start_second,
                  &playtime.start_frame);
    FRAMES_TO_MSF(start + length, &playtime.end_minute, &playtime.end_second,
                  &playtime.end_frame);

    if (devctl
        (cdrom->id, DCMD_CAM_CDROMPLAYMSF, &playtime, sizeof(playtime),
         NULL) != 0) {
        return -1;
    } else {
        return 0;
    }
}

/* Pause play */
static int
SDL_SYS_CDPause(SDL_CD * cdrom)
{
    if (devctl(cdrom->id, DCMD_CAM_CDROMPAUSE, NULL, 0, NULL) != 0) {
        return -1;
    } else {
        return 0;
    }
}

/* Resume play */
static int
SDL_SYS_CDResume(SDL_CD * cdrom)
{
    if (devctl(cdrom->id, DCMD_CAM_CDROMRESUME, NULL, 0, NULL) != 0) {
        return -1;
    } else {
        return 0;
    }
}

/* Stop play */
static int
SDL_SYS_CDStop(SDL_CD * cdrom)
{
    if (devctl(cdrom->id, DCMD_CAM_CDROMSTOP, NULL, 0, NULL) != 0) {
        return -1;
    } else {
        return 0;
    }
}

/* Eject the CD-ROM */
static int
SDL_SYS_CDEject(SDL_CD * cdrom)
{
    if (devctl(cdrom->id, DCMD_CAM_EJECT_MEDIA, NULL, 0, NULL) != 0) {
        return -1;
    } else {
        return 0;
    }
}

/* Close the CD-ROM handle */
static void
SDL_SYS_CDClose(SDL_CD * cdrom)
{
    int i;

    for (i = 0; i < MAX_DRIVES; i++) {
        if (SDL_cdopen[i] == cdrom->id) {
            SDL_cdopen[i] = 0;
            break;
        }
    }

    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;
    }
}

#endif /* SDL_CDROM_QNX */
/* vi: set ts=4 sw=4 expandtab: */