/*

    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

*/

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

//#define DEBUG_CDROM 1

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <io/cam/cdrom.h>

#include <io/cam/rzdisk.h>

#include <io/common/devgetinfo.h>

#include <alloca.h>

#include <stdlib.h>

#include <stdio.h>

#include <string.h>

#include <errno.h>

#include "SDL_error.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);

/* Some ioctl() errno values which occur when the tray is empty */

#define ERRNO_TRAYEMPTY(errno)	\

    ((errno == EIO) || (errno == ENOENT) || (errno == EINVAL))

/* Check a drive to see if it is a CD-ROM */

/* Caution!! Not tested. */ 

static int CheckDrive(char *drive, struct stat *stbuf)

{

    int is_cd, cdfd;

    struct cd_sub_channel 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;

    if ( S_ISCHR(stbuf->st_mode) || S_ISBLK(stbuf->st_mode) ) {

	cdfd = open(drive, (O_RDWR|O_NDELAY), 0);

	if ( cdfd >= 0 ) {

	    info.sch_address_format = CDROM_MSF_FORMAT;

	    info.sch_data_format = CDROM_CURRENT_POSITION;

	    info.sch_alloc_length = 0;

	    info.sch_track_number = 0;

	    info.sch_buffer = NULL;

	    /*

	     *

	     * Under Linux, EIO occurs when a disk is not present.

	     * This isn't 100% reliable, so we use the USE_MNTENT

	     * code above instead.

	     *

	     */

	    if ( (ioctl(cdfd, CDROM_READ_SUBCHANNEL, &info) == 0) ||

		    ERRNO_TRAYEMPTY(errno) ) {

		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] ) {

#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] = (char *)malloc(strlen(drive)+1);

	if ( SDL_cdlist[i] == NULL ) {

	    SDL_OutOfMemory();

	    return;

	}

	strcpy(SDL_cdlist[i], drive);

	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: /dev/cdrom,/dev/cd?c /dev/acd?c

     * /dev/matcd?c /dev/mcd?c /dev/scd?c

     *

     */

    static char *checklist[] = {

	"?0 rdisk/cdrom?",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 = getenv("SDL_CDROM");	/* ':' separated list of devices */

    if ( SDLcdrom != NULL ) {

	char *cdpath, *delim;

	cdpath = malloc(strlen(SDLcdrom)+1);

	if ( cdpath != NULL ) {

	    strcpy(cdpath, SDLcdrom);

	    SDLcdrom = cdpath;

	    do {

		delim = strchr(SDLcdrom, ':');

		if ( delim ) {

		    *delim++ = '\0';

		}

		if ( CheckDrive(SDLcdrom, &stbuf) > 0 ) {

		    AddDrive(SDLcdrom, &stbuf);

		}

		if ( delim ) {

		    SDLcdrom = delim;

		} else {

		    SDLcdrom = NULL;

		}

	    } while ( SDLcdrom );

	    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 ) {

		sprintf(drive, "/dev/%sc", &checklist[i][3]);

		insert = 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 {

	    sprintf(drive, "/dev/%s", checklist[i]);

	    if ( CheckDrive(drive, &stbuf) > 0 ) {

		AddDrive(drive, &stbuf);

	    }

	}

    }

/*

    SDLcdrom=malloc(sizeof(char) * 32);

    strcpy(SDLcdrom,"/dev/rdisk/cdrom0c");

    SDL_cdlist[0] = SDLcdrom;

    stat(SDLcdrom, &stbuf);

    SDL_cdmode[0] = stbuf.st_rdev;

    SDL_numcds = 1;

 */

    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;

    }

    (char *)cdte = 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,

		  &msf.msf_starting_M_unit,

		  &msf.msf_starting_S_unit,

		  &msf.msf_starting_F_unit);

    FRAMES_TO_MSF(end,

		  &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 ) {

	    free(SDL_cdlist[i]);

	}

	SDL_numcds = 0;

    }

}