Date: Tue, 13 Apr 2004 14:29:09 +1000 From: Andrew Milton <akm@theinternet.com.au> To: Tim Aslat <tim@spyderweb.com.au> Cc: FreeBSD Multimedia <freebsd-multimedia@freebsd.org> Subject: Re: Media Detection Message-ID: <20040413042909.GC28737@camelot.theinternet.com.au> In-Reply-To: <20040413125131.04358c77@bofh.spyderweb.com.au> References: <20040413125131.04358c77@bofh.spyderweb.com.au>
next in thread | previous in thread | raw e-mail | index | archive | help
+-------[ Tim Aslat ]----------------------
| Hi All,
|
| Just trying to set up a PVR type device and would like to throw in a
| feature to detect what media (if any) is inserted into the DVD burner.
[snip]
| How would I go about checking the media if it's a blank, non-blank or RW
| disk?
|
| C or C++ code would be great.
I don't have a DVD burner, but, the following chunk of code serves me fairly
well for my atapi DVD and CD drives. SCSI drives have a different API to ATA
ones, so this may not work for SCSI or ATAPICAM devices. There's some debug in
there that could go, but, it might help you so I left it in. It compiles under
-current.
It's also based on empircal loading of different media types I have lying
around, so YMMV w.r.t to detection d8)
returns 0 for NO DISK
returns 1 for Audio or Audio + Copy Protection/Data.
returns 2 for Data
returns 3 for Unknown (something is loaded, but, we don't know what).
------------------------------------------------------------------------
#include <unistd.h>
#include <ctype.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/cdio.h>
#include <sys/stat.h>
#define CD_TYPE_AUDIO 100
#define CD_TYPE_MIXED 105
#define CD_STATUS_OK 4
#define CD_STATUS_NO_DISC 1
int CD_getTOCHeader(int fd, struct ioc_toc_header *ith)
{
if(ioctl(fd, CDIOREADTOCHEADER, ith) < 0)
{
perror("Read TOC");
return(0);
}
return(1);
}
int CD_Status(int fd)
{
struct ioc_read_toc_entry irte;
struct cd_toc_entry *tocP;
struct ioc_toc_header ith;
u_int control;
u_char track;
int status = 0, i;
status = CD_STATUS_NO_DISC;
if(CD_getTOCHeader(fd, &ith) < 0)
{
perror("read toc header");
return(0);
}
printf("Start: %d\n", ith.starting_track);
printf("End: %d\n", ith.ending_track);
printf("Length %d\n", ith.len);
memset(&irte, 0, sizeof(struct ioc_read_toc_entry));
irte.data = (struct cd_toc_entry *)malloc(ith.len * sizeof(struct cd_toc_entry));
irte.data_len = ith.len * sizeof(struct cd_toc_entry);;
irte.address_format = CD_LBA_FORMAT;
irte.starting_track = 0;
if(ioctl(fd, CDIOREADTOCENTRYS, &irte) < 0)
{
free(irte.data);
perror("read toc");
return(0);
}
for(i = 0; i <irte.data_len; ++i)
{
tocP = &(irte.data[i]);
control = tocP->control;
track = tocP->track;
if(track == 0)
{
break;
}
if(control == 0 && status != CD_TYPE_MIXED)
{
status = CD_TYPE_AUDIO;
}
else if(control != 0)
{
if(status == CD_TYPE_AUDIO)
{
status = CD_TYPE_MIXED;
}
else
{
status = 100 + control;
}
}
else if(control == 5)
{
status = CD_TYPE_MIXED;
}
}
free(irte.data);
if(status == CD_TYPE_AUDIO || status == CD_TYPE_MIXED)
{
return(1);
}
status == lseek(fd, 0x8000, SEEK_SET);
if(status < 0)
{
perror("lseek");
return(3);
}
return(2);
}
--
Totally Holistic Enterprises Internet| | Andrew Milton
The Internet (Aust) Pty Ltd | M:+61 416 022 411 |
ACN: 082 081 472 ABN: 83 082 081 472 |akm@theinternet.com.au| Carpe Daemon
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20040413042909.GC28737>