/*

    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 */