Path: utzoo!attcan!uunet!spool.mu.edu!sdd.hp.com!hp-pcd!hpfcso!hpfcdj!kinsell
From: kinsell@hpfcdj.HP.COM (Dave Kinsell)
Newsgroups: comp.sys.hp
Subject: Re: cdrom questions
Message-ID: <17330026@hpfcdj.HP.COM>
Date: 31 Jan 91 02:28:37 GMT
References: <1991Jan23.192953.28335@eye.com>
Organization: Hewlett Packard -- Fort Collins, CO
Lines: 195


>1. VERY IMPORTANT:  Is it possible to play "normal" audio cd's with these
>   things?  


>Paul B. Booth  (paul@eye.com) (...!hplabs!hpfcla!eye!paul)

I realize you're asking about the HP-IB version of the player, but I'll
post a program for the SCSI version in case other people would be interested.
This *really* is unsupported software, and I regretfully am not in a position
to dribble out information from the 120 page OEM manual.   There has never
been an intent to document the audio commands on this device. 

Regards
Dave Kinsell


------------------------------------------------------------------------------
/*
Program scsi_play, used for playing selected tracks from
an audio CD-ROM on Hewlett-Packard Series 300 and 400 computers.

Specify starting track number with -t option (default is 1).
Specify number of tracks to play with -n option (default is 0).
If 0 tracks are chosen, entire disc is played.
Use -h to halt playing.
Not all audio CDs start at track 1!
Requires character device as a parameter.
Requires root privilege to run.
Works only with Toshiba XM-3201 SCSI CD-ROM player.
Tested with S300/S400 HP-UX, rev 7.0
Supplied without warranty or support of any kind.
*/


#include <stdio.h>
#include <sys/scsi.h>
	

struct scsi_cmd_parms track_search = {
	10, 1, 500,
	0xc0, 0x00, 0x01, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x80
	};

struct scsi_cmd_parms play_audio = {
	10, 1, 500,
	0xc1, 0x03, 0x02, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x80
	};

struct scsi_cmd_parms read_disc_info = {
	10, 1, 500,
	0xc7, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00
	};

struct scsi_cmd_parms stop = {
	6, 1, 500,
	0x1b, 0x00, 0x00, 0x00, 0x00, 0x00
	};

struct scsi_cmd_parms status = {		/* not used */
	10, 1, 500,
	0xc6, 0x0a, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00
	};


main(argc,argv)
int argc;
char *argv[];
{
int fd, c, ret, first_track= 1, last_track, halt=0,
		num_tracks=0;
int first_avail, last_avail;
unsigned char buf[256];
char    *name, *begin = NULL, *num = NULL;

extern  int opterr, optind;
extern  char	*optarg;
opterr=0;
while (( c = getopt(argc, argv, "Hht:T:n:N:")) != EOF) {
       	switch (c) {
	case 'T':
	case 't': begin = optarg;
		  sscanf(begin,"%d",&first_track);
	  	  break;
       	case 'N':
	case 'n': num = optarg;
		  sscanf(num,"%d",&num_tracks);
	  	  break;
	case 'H':
	case 'h': halt=1; break;
       	default:  usage(argv[0]);
	}
    }

if ((name = argv[optind++])==NULL || argv[optind] != NULL)
	usage(argv[0]);
if ((fd=open(name, 0))<0)	{
	perror("play: error in open");
	exit(1);
	}

if(halt==1)  {
	set_command(fd);
	ioctl(fd, SIOC_SET_CMD, &stop);		/* stop playing */
	ret = read(fd, buf, 0xff);
	close(fd);
	exit(0);
	}


set_command(fd);
ioctl(fd, SIOC_SET_CMD, &read_disc_info);	/* find first,last */
ret = read(fd, buf, 0xff);

clear_command(fd);
ret = read(fd, buf, 0xff);

first_avail = convy(buf[0]);		/* comes out in bcd */
last_avail = convy(buf[1]);
printf("first track available =%4i   last track available = %4i\n", first_avail, last_avail);

last_track = first_track + num_tracks-1;
if(num_tracks == 0)  last_track = last_avail;
printf("first track selected  =%4i   last track selected  = %4i\n",first_track,last_track);

if(first_track < first_avail) {
	printf("Starting track out of range\n");
	exit(1);
	}
if(last_track > last_avail) {
	printf("Ending track out of range\n");
	exit(1);
	}

track_search.command[2]  = (unsigned char)(convx(first_track) );
						 /* requires bcd */
play_audio.command[2] = (unsigned char)(convx(last_track+1) );

if(last_track == last_avail) 	play_audio.command[2] = 0  ;
						/* play to end */

set_command(fd);
ioctl(fd, SIOC_SET_CMD, &track_search);		/* seek to track */
ret = read(fd, buf, 0xff);
ioctl(fd, SIOC_SET_CMD, &play_audio);		/* and play */
ret = read(fd, buf, 0xff);

close(fd);
exit(0);
}  


usage(name)
char *name;
{
fprintf(stderr,"usage: %s [-h ] [-t <first track>] [-n <number of tracks>] raw_device_file\n",name);
    exit(1);
}

int convx(number)	 /* do an integer to bcd conversion */
int number;
{
return (number+6*(number/10)) & 0xff ;
}

int convy(number)	 /* do a bcd to integer conversion */
int number;
{
return (number/16)*10 + number%16;
}


int set_command(fd)	/* set command mode */
int fd;
{
int flag=1, ret;
if((ret = ioctl(fd, SIOC_CMD_MODE, &flag))<0)	{
	perror("error in ioctl setup CMD MODE");
	exit(1);
	}
}

int clear_command(fd)	/* clear command mode */
int fd;
{
int flag=0, ret;
if((ret = ioctl(fd, SIOC_CMD_MODE, &flag))<0)	{
	perror("error in ioctl setup CMD MODE");
	exit(1);
	}
}