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From: robsch@robkaos.GUN.de (Robert Schien)
Subject: CD-ROM programming problem
Organization: Private System, Essen, Germany
Date: Tue, 9 Nov 1993 23:27:36 GMT
X-Newsreader: TIN [version 1.2 PL2]
Message-ID: <1993Nov9.232736.2911@robkaos.GUN.de>
Lines: 43
I'm trying to write a simple cdplayer (for a SCSI CDROM). Therefore
I looked trough <sys/cdio.h> and I found an ioctl named CDIOCPLAYTRACKS.
The following code segment should do it:
#include <stdio.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <sys/errno.h>
#include <sys/cdio.h>
main()
{
int filedes,result,track,block,len;
struct ioc_play_track play_structure;
result=open("/dev/cd0d", O_RDONLY);
if (result==-1) { perror("open"); return(1); };
filedes=result;
play_structure.start_track=1;
play_structure.end_track=1;
play_structure.start_index=1; /* is index 1 always correct? */
play_structure.end_index=1;
result=ioctl(filedes,CDIOCPLAYTRACKS,&play_structure);
if (result==-1) { perror("play ioctl"); return(1); };
}
The above little program should play the first track of an audio CD.
It does not. It returns with 'play ioctl: invalid argument'.
What am I doing wrong?
The analogous program with CDIOCPLAYBLOCKS does work.
My hardware is a 386-DX40 with an NEC 84-11 SCSI Miltispin CDROM drive
connected to an Adaptec 1542C. I have NO problems mounting ISO-fs-CDs.
The kernel is FreeBSD-1.0-RELEASE, the rest of the system EPSILON.
Where can I find more information on writing CDROM applications?
Thank you in advance.
Robert