/*
    Tru64 audio module for SDL (Simple DirectMedia Layer)
    Copyright (C) 2003

    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


*/
#include "SDL_config.h"

#ifdef SDL_CDROM_OSF

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

/* #define DEBUG_CDROM 1 */

#include <sys/types.h>
#include <dirent.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <io/cam/cdrom.h>
#include <io/cam/rzdisk.h>
#include <io/common/devgetinfo.h>

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

/* 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);

/* Check a drive to see if it is a CD-ROM */
/* Caution!! Not tested. */
static int
CheckDrive(char *drive, struct stat *stbuf)
{
    int cdfd, is_cd = 0;
    struct mode_sel_sns_params msp;
    struct inquiry_info inq;

#ifdef DEBUG_CDROM
    char *devtype[] = { "Disk", "Tape", "Printer", "Processor", "WORM",
        "CD-ROM", "Scanner", "Optical", "Changer", "Comm", "Unknown"
    };
#endif

    bzero(&msp, sizeof(msp));
    bzero(&inq, sizeof(inq));

    /* If it doesn't exist, return -1 */
    if (stat(drive, stbuf) < 0) {
        return (-1);
    }

    if ((cdfd = open(drive, (O_RDWR | O_NDELAY), 0)) >= 0) {
        msp.msp_addr = (caddr_t) & inq;
        msp.msp_pgcode = 0;
        msp.msp_pgctrl = 0;
        msp.msp_length = sizeof(inq);
        msp.msp_setps = 0;

        if (ioctl(cdfd, SCSI_GET_INQUIRY_DATA, &msp))
            return (0);

#ifdef DEBUG_CDROM
        fprintf(stderr, "Device Type: %s\n", devtype[inq.perfdt]);
        fprintf(stderr, "Vendor: %.8s\n", inq.vndrid);
        fprintf(stderr, "Product: %.8s\n", inq.prodid);
        fprintf(stderr, "Revision: %.8s\n", inq.revlvl);
#endif
        if (inq.perfdt == DTYPE_RODIRECT)
            is_cd = 1;
    }

    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] = SDL_strdup(drive);
        if (SDL_cdlist[i] == NULL) {
            SDL_OutOfMemory();
            return;
        }
        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:
     *
     * Tru64 5.X (/dev/rdisk/cdrom?c)
     * dir: /dev/rdisk, name: cdrom
     *
     * Digital UNIX 4.0X (/dev/rrz?c)
     * dir: /dev, name: rrz
     *
     */
    struct
    {
        char *dir;
        char *name;
    } checklist[] = {
        {
        "/dev/rdisk", "cdrom"}, {
        "/dev", "rrz"}, {
    NULL, NULL}};
    char drive[32];
    char *SDLcdrom;
    int i, j, exists;
    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;
        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].dir; ++i) {
        DIR *devdir;
        struct dirent *devent;
        int name_len;

        devdir = opendir(checklist[i].dir);
        if (devdir) {
            name_len = SDL_strlen(checklist[i].name);
            while (devent = readdir(devdir))
                if (SDL_memcmp
                    (checklist[i].name, devent->d_name, name_len) == 0)
                    if (devent->d_name[devent->d_namlen - 1] == 'c') {
                        SDL_snprintf(drive, SDL_arraysize(drive),
                                     "%s/%s", checklist[i].dir,
                                     devent->d_name);
#ifdef DEBUG_CDROM
                        fprintf(stderr, "Try to add drive: %s\n", drive);
#endif
                        if (CheckDrive(drive, &stbuf) > 0)
                            AddDrive(drive, &stbuf);
                    }
            closedir(devdir);
        } else {
#ifdef DEBUG_CDROM
            fprintf(stderr, "cannot open dir: %s\n", checklist[i].dir);
#endif
        }
    }
    return (0);
}

static const char *
SDL_SYS_CDName(int drive)
{
    return (SDL_cdlist[drive]);
}

static int
SDL_SYS_CDOpen(int drive)
{
    /* O_RDWR: To use ioctl(fd, SCSI_STOP_UNIT) */
    return (open(SDL_cdlist[drive], (O_RDWR | O_NDELAY), 0));
}

static int
SDL_SYS_CDGetTOC(SDL_CD * cdrom)
{
    struct cd_toc toc;
    struct cd_toc_header hdr;
    struct cd_toc_entry *cdte;
    int i;
    int okay = 0;
    if (ioctl(cdrom->id, CDROM_TOC_HEADER, &hdr)) {
        fprintf(stderr, "ioctl error CDROM_TOC_HEADER\n");
        return -1;
    }
    cdrom->numtracks = hdr.th_ending_track - hdr.th_starting_track + 1;
    if (cdrom->numtracks > SDL_MAX_TRACKS) {
        cdrom->numtracks = SDL_MAX_TRACKS;
    }
#ifdef DEBUG_CDROM
    fprintf(stderr, "hdr.th_data_len1 = %d\n", hdr.th_data_len1);
    fprintf(stderr, "hdr.th_data_len0 = %d\n", hdr.th_data_len0);
    fprintf(stderr, "hdr.th_starting_track = %d\n", hdr.th_starting_track);
    fprintf(stderr, "hdr.th_ending_track = %d\n", hdr.th_ending_track);
    fprintf(stderr, "cdrom->numtracks = %d\n", cdrom->numtracks);
#endif
    toc.toc_address_format = CDROM_LBA_FORMAT;
    toc.toc_starting_track = 0;
    toc.toc_alloc_length = (hdr.th_data_len1 << 8) +
        hdr.th_data_len0 + sizeof(hdr);
    if ((toc.toc_buffer = alloca(toc.toc_alloc_length)) == NULL) {
        fprintf(stderr, "cannot allocate toc.toc_buffer\n");
        return -1;
    }

    bzero(toc.toc_buffer, toc.toc_alloc_length);
    if (ioctl(cdrom->id, CDROM_TOC_ENTRYS, &toc)) {
        fprintf(stderr, "ioctl error CDROM_TOC_ENTRYS\n");
        return -1;
    }

    cdte = (struct cd_toc_entry *) ((char *) toc.toc_buffer + sizeof(hdr));
    for (i = 0; i <= cdrom->numtracks; ++i) {
        if (i == cdrom->numtracks) {
            cdrom->track[i].id = 0xAA;;
        } else {
            cdrom->track[i].id = hdr.th_starting_track + i;
        }

        cdrom->track[i].type = cdte[i].te_control & CDROM_DATA_TRACK;
        cdrom->track[i].offset =
            cdte[i].te_absaddr.lba.addr3 << 24 |
            cdte[i].te_absaddr.lba.addr2 << 16 |
            cdte[i].te_absaddr.lba.addr1 << 8 | cdte[i].te_absaddr.lba.addr0;
        cdrom->track[i].length = 0;
        if (i > 0) {
            cdrom->track[i - 1].length =
                cdrom->track[i].offset - cdrom->track[i - 1].offset;
        }
    }
#ifdef DEBUG_CDROM
    for (i = 0; i <= cdrom->numtracks; i++) {
        fprintf(stderr, "toc_entry[%d].te_track_number = %d\n",
                i, cdte[i].te_track_number);
        fprintf(stderr, "cdrom->track[%d].id = %d\n", i, cdrom->track[i].id);
        fprintf(stderr, "cdrom->track[%d].type = %x\n", i,
                cdrom->track[i].type);
        fprintf(stderr, "cdrom->track[%d].offset = %d\n", i,
                cdrom->track[i].offset);
        fprintf(stderr, "cdrom->track[%d].length = %d\n", i,
                cdrom->track[i].length);
    }
#endif
    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;
    struct cd_sub_channel sc;
    struct cd_subc_channel_data scd;

    sc.sch_address_format = CDROM_LBA_FORMAT;
    sc.sch_data_format = CDROM_CURRENT_POSITION;
    sc.sch_track_number = 0;
    sc.sch_alloc_length = sizeof(scd);
    sc.sch_buffer = (caddr_t) & scd;
    if (ioctl(cdrom->id, CDROM_READ_SUBCHANNEL, &sc)) {
        status = CD_ERROR;
        fprintf(stderr, "ioctl error CDROM_READ_SUBCHANNEL \n");
    } else {
        switch (scd.scd_header.sh_audio_status) {
        case AS_AUDIO_INVALID:
            status = CD_STOPPED;
            break;
        case AS_PLAY_IN_PROGRESS:
            status = CD_PLAYING;
            break;
        case AS_PLAY_PAUSED:
            status = CD_PAUSED;
            break;
        case AS_PLAY_COMPLETED:
            status = CD_STOPPED;
            break;
        case AS_PLAY_ERROR:
            status = CD_ERROR;
            break;
        case AS_NO_STATUS:
            status = CD_STOPPED;
            break;
        default:
            status = CD_ERROR;
            break;
        }
#ifdef DEBUG_CDROM
        fprintf(stderr, "scd.scd_header.sh_audio_status = %x\n",
                scd.scd_header.sh_audio_status);
#endif
    }
    if (position) {
        if (status == CD_PLAYING || (status == CD_PAUSED)) {
            *position =
                scd.scd_position_data.scp_absaddr.lba.addr3 << 24 |
                scd.scd_position_data.scp_absaddr.lba.addr2 << 16 |
                scd.scd_position_data.scp_absaddr.lba.addr1 << 8 |
                scd.scd_position_data.scp_absaddr.lba.addr0;
        } else {
            *position = 0;
        }
    }

    return status;
}

/* Start play */
static int
SDL_SYS_CDPlay(SDL_CD * cdrom, int start, int length)
{
/*
 * Play MSF
 */
    struct cd_play_audio_msf msf;
    int end;

    bzero(&msf, sizeof(msf));
    end = start + length;
    FRAMES_TO_MSF(start + 150,  /* LBA = 4500*M + 75*S + F - 150 */
                  &msf.msf_starting_M_unit,
                  &msf.msf_starting_S_unit, &msf.msf_starting_F_unit);
    FRAMES_TO_MSF(end + 150,    /* LBA = 4500*M + 75*S + F - 150 */
                  &msf.msf_ending_M_unit,
                  &msf.msf_ending_S_unit, &msf.msf_ending_F_unit);

    return (ioctl(cdrom->id, CDROM_PLAY_AUDIO_MSF, &msf));
}

/* Pause play */
static int
SDL_SYS_CDPause(SDL_CD * cdrom)
{
    return (ioctl(cdrom->id, CDROM_PAUSE_PLAY));
}

/* Resume play */
static int
SDL_SYS_CDResume(SDL_CD * cdrom)
{
    return (ioctl(cdrom->id, CDROM_RESUME_PLAY));
}

/* Stop play */
static int
SDL_SYS_CDStop(SDL_CD * cdrom)
{
    return (ioctl(cdrom->id, SCSI_STOP_UNIT));
}

/* Eject the CD-ROM */
static int
SDL_SYS_CDEject(SDL_CD * cdrom)
{
    return (ioctl(cdrom->id, CDROM_EJECT_CADDY));
}

/* 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;
    }
}

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