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/* --------------------------------------------------------------------------
MusicBrainz -- The Internet music metadatabase
Copyright (C) 2000 Robert Kaye
Copyright (C) 1999 Marc E E van Woerkom
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
$Id: mb_linux.cpp,v 1.4 2004/04/26 20:10:44 robert Exp $
----------------------------------------------------------------------------*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <assert.h>
#include "mb.h"
#include "diskid.h"
#include "config.h"
#define XA_INTERVAL ((60 + 90 + 2) * CD_FRAMES)
MUSICBRAINZ_DEVICE DEFAULT_DEVICE = "/dev/cdrom";
int ReadTOCHeader(int fd,
int& first,
int& last)
{
struct cdrom_tochdr th;
struct cdrom_multisession ms;
int ret = ioctl(fd,
CDROMREADTOCHDR,
&th);
if (!ret)
{
// Hide the last track if this is a multisession disc (note that
// currently only dual-session discs with one track in the second
// session are handled correctly).
ms.addr_format = CDROM_LBA;
ret = ioctl(fd,
CDROMMULTISESSION,
&ms);
first = th.cdth_trk0;
last = th.cdth_trk1;
if (ms.xa_flag)
last--;
}
return ret;
}
int ReadTOCEntry(int fd,
int track,
int& lba)
{
struct cdrom_tocentry te;
struct cdrom_multisession ms;
int ret = 0;
if (track == CDROM_LEADOUT)
{
// For a multisession disc, the location of the single-session lead-out
// track must be calculated based on where the last session begins.
ms.addr_format = CDROM_LBA;
ret = ioctl(fd,
CDROMMULTISESSION,
&ms);
if (ms.xa_flag)
{
lba = ms.addr.lba - XA_INTERVAL;
return ret;
}
}
if (!ret)
{
te.cdte_track = track;
te.cdte_format = CDROM_LBA;
ret = ioctl(fd,
CDROMREADTOCENTRY,
&te);
assert(te.cdte_format == CDROM_LBA);
lba = te.cdte_addr.lba;
}
return ret;
}
bool DiskId::ReadTOC(MUSICBRAINZ_DEVICE device,
MUSICBRAINZ_CDINFO& cdinfo)
{
int fd;
int first;
int last;
int lba;
int i;
if (device == NULL)
{
device = DEFAULT_DEVICE;
}
fd = open(device, O_RDONLY | O_NONBLOCK);
if (fd < 0)
{
char err[256];
sprintf(err,"Cannot open '%s'", device);
ReportError(err);
return false;
}
// Initialize cdinfo to all zeroes.
memset(&cdinfo, 0, sizeof(MUSICBRAINZ_CDINFO));
// Find the number of the first track (usually 1) and the last track.
if (ReadTOCHeader(fd, first, last))
{
ReportError("Cannot read table of contents.");
close(fd);
return false;
}
// Do some basic error checking.
if (last==0)
{
ReportError("This disk has no tracks.");
close(fd);
return false;
}
// Get the logical block address (lba) for the end of the audio data.
// The "LEADOUT" track is the track beyond the final audio track
// so we're looking for the block address of the LEADOUT track.
ReadTOCEntry(fd,
CDROM_LEADOUT,
lba);
cdinfo.FrameOffset[0] = lba + 150;
// Now, for every track, find out the block address where it starts.
for (i = first; i <= last; i++)
{
ReadTOCEntry(fd, i, lba);
cdinfo.FrameOffset[i] = lba + 150;
}
cdinfo.FirstTrack = first;
cdinfo.LastTrack = last;
close(fd);
return true;
}
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