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133 lines
4.2 KiB
133 lines
4.2 KiB
/****************************************************************************
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* linux_cdrom_tools.c: linux cdrom tools
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*****************************************************************************
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* Copyright (C) 1998-2001 VideoLAN
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*
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* Author: Johan Bilien <jobi@via.ecp.fr>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
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*****************************************************************************/
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/*****************************************************************************
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* Preamble
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*****************************************************************************/
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#include <stdio.h>
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#include <stdlib.h>
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#include <videolan/vlc.h>
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#include <fcntl.h>
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#include <sys/types.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/ioctl.h>
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#include "linux_cdrom_tools.h"
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/*****************************************************************************
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* ioctl_ReadTocHeader: Read the TOC header and return the track number.
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*****************************************************************************/
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int ioctl_GetTrackCount( int i_fd )
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{
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struct cdrom_tochdr tochdr;
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/* First we read the TOC header */
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if( ioctl( i_fd, CDROMREADTOCHDR, &tochdr ) == -1 )
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{
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intf_ErrMsg( "vcd error: could not read TOCHDR" );
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return -1;
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}
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return tochdr.cdth_trk1 - tochdr.cdth_trk0 + 1;
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}
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/*****************************************************************************
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* ioctl_GetSectors: Read the Table of Contents and fill p_vcd.
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*****************************************************************************/
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int * ioctl_GetSectors( int i_fd )
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{
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int i, i_tracks;
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int *p_sectors;
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struct cdrom_tochdr tochdr;
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struct cdrom_tocentry tocent;
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/* First we read the TOC header */
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if( ioctl( i_fd, CDROMREADTOCHDR, &tochdr ) == -1 )
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{
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intf_ErrMsg( "vcd error: could not read TOCHDR" );
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return NULL;
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}
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i_tracks = tochdr.cdth_trk1 - tochdr.cdth_trk0 + 1;
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p_sectors = malloc( (i_tracks + 1) * sizeof(int) );
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if( p_sectors == NULL )
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{
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intf_ErrMsg( "vcd error: could not allocate p_sectors" );
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return NULL;
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}
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/* Fill the p_sectors structure with the track/sector matches */
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for( i = 0 ; i <= i_tracks ; i++ )
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{
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tocent.cdte_format = CDROM_LBA;
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tocent.cdte_track =
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( i == i_tracks ) ? CDROM_LEADOUT : tochdr.cdth_trk0 + i;
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if( ioctl( i_fd, CDROMREADTOCENTRY, &tocent ) == -1 )
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{
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intf_ErrMsg( "vcd error: could not read TOCENTRY" );
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free( p_sectors );
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return NULL;
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}
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p_sectors[ i ] = tocent.cdte_addr.lba;
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}
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return p_sectors;
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}
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/****************************************************************************
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* ioctl_ReadSector: Read a sector (2324 bytes)
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****************************************************************************/
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int ioctl_ReadSector( int i_fd, int i_sector, byte_t * p_buffer )
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{
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byte_t p_block[ VCD_SECTOR_SIZE ];
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int i_dummy = i_sector + 2 * CD_FRAMES;
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#define p_msf ((struct cdrom_msf0 *)p_block)
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p_msf->minute = i_dummy / (CD_FRAMES * CD_SECS);
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p_msf->second = ( i_dummy % (CD_FRAMES * CD_SECS) ) / CD_FRAMES;
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p_msf->frame = ( i_dummy % (CD_FRAMES * CD_SECS) ) % CD_FRAMES;
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#undef p_msf
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if( ioctl(i_fd, CDROMREADRAW, p_block) == -1 )
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{
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intf_ErrMsg( "vcd error: could not read block %i from disc",
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i_sector );
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return -1;
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}
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/* We don't want to keep the header of the read sector */
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FAST_MEMCPY( p_buffer, p_block + VCD_DATA_START, VCD_DATA_SIZE );
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return 0;
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}
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