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#include <sys/cdio.h>
#include <sys/cdrio.h>
//=================== VideoCD ==========================
#define CDROM_LEADOUT 0xAA
typedef struct {
uint8_t sync [12];
uint8_t header [4];
uint8_t subheader [8];
uint8_t data [2324];
uint8_t spare [4];
} cdsector_t;
static cdsector_t vcd_buf;
static struct ioc_read_toc_single_entry vcd_entry;
static inline void vcd_set_msf(unsigned int sect){
vcd_entry.entry.addr.msf.frame=sect%75;
sect=sect/75;
vcd_entry.entry.addr.msf.second=sect%60;
sect=sect/60;
vcd_entry.entry.addr.msf.minute=sect;
}
static inline unsigned int vcd_get_msf(){
return vcd_entry.entry.addr.msf.frame +
(vcd_entry.entry.addr.msf.second+
vcd_entry.entry.addr.msf.minute*60)*75;
}
int vcd_seek_to_track(int fd,int track){
vcd_entry.address_format = CD_MSF_FORMAT;
vcd_entry.track = track;
if (ioctl(fd, CDIOREADTOCENTRY, &vcd_entry)) {
perror("ioctl dif1");
return -1;
}
return VCD_SECTOR_DATA*vcd_get_msf();
}
int vcd_get_track_end(int fd,int track){
struct ioc_toc_header tochdr;
if (ioctl(fd,CDIOREADTOCHEADER,&tochdr)==-1)
{ perror("read CDROM toc header: "); return -1; }
vcd_entry.address_format = CD_MSF_FORMAT;
vcd_entry.track = track<tochdr.ending_track?(track+1):CDROM_LEADOUT;
if (ioctl(fd, CDIOREADTOCENTRY, &vcd_entry)) {
perror("ioctl dif2");
return -1;
}
return VCD_SECTOR_DATA*vcd_get_msf();
}
void vcd_read_toc(int fd){
struct ioc_toc_header tochdr;
int i;
if (ioctl(fd,CDIOREADTOCHEADER,&tochdr)==-1)
{ perror("read CDROM toc header: "); return; }
for (i=tochdr.starting_track ; i<=tochdr.ending_track ; i++){
struct ioc_read_toc_single_entry tocentry;
tocentry.track = i;
tocentry.address_format = CD_MSF_FORMAT;
if (ioctl(fd,CDIOREADTOCENTRY,&tocentry)==-1)
{ perror("read CDROM toc entry: "); return; }
printf("track %02d: adr=%d ctrl=%d format=%d %02d:%02d:%02d\n",
(int)tocentry.track,
(int)tocentry.entry.addr_type,
(int)tocentry.entry.control,
(int)tocentry.address_format,
(int)tocentry.entry.addr.msf.minute,
(int)tocentry.entry.addr.msf.second,
(int)tocentry.entry.addr.msf.frame
);
}
}
static int vcd_read(int fd,char *mem){
if (pread(fd,&vcd_buf,VCD_SECTOR_SIZE,vcd_get_msf()*VCD_SECTOR_SIZE)
!= VCD_SECTOR_SIZE) return 0; // EOF?
vcd_entry.entry.addr.msf.frame++;
if (vcd_entry.entry.addr.msf.frame==75){
vcd_entry.entry.addr.msf.frame=0;
vcd_entry.entry.addr.msf.second++;
if (vcd_entry.entry.addr.msf.second==60){
vcd_entry.entry.addr.msf.second=0;
vcd_entry.entry.addr.msf.minute++;
}
}
memcpy(mem,vcd_buf.data,VCD_SECTOR_DATA);
return VCD_SECTOR_DATA;
}
//================== VCD CACHE =======================
#ifdef VCD_CACHE
static int vcd_cache_size=0;
static char *vcd_cache_data=NULL;
static int *vcd_cache_sectors=NULL;
static int vcd_cache_index=0; // index to first free (or oldest) cache sector
static int vcd_cache_current=-1;
void vcd_cache_init(int s){
vcd_cache_size=s;
vcd_cache_sectors=malloc(s*sizeof(int));
vcd_cache_data=malloc(s*VCD_SECTOR_SIZE);
memset(vcd_cache_sectors,255,s*sizeof(int));
}
static inline void vcd_cache_seek(int sect){
vcd_cache_current=sect;
}
int vcd_cache_read(int fd,char* mem){
int i;
char* vcd_buf;
for(i=0;i<vcd_cache_size;i++)
if(vcd_cache_sectors[i]==vcd_cache_current){
// found in the cache! :)
vcd_buf=&vcd_cache_data[i*VCD_SECTOR_SIZE];
++vcd_cache_current;
memcpy(mem,&vcd_buf[VCD_SECTOR_OFFS],VCD_SECTOR_DATA);
return VCD_SECTOR_DATA;
}
// NEW cache entry:
vcd_buf=&vcd_cache_data[vcd_cache_index*VCD_SECTOR_SIZE];
vcd_cache_sectors[vcd_cache_index]=vcd_cache_current;
++vcd_cache_index;if(vcd_cache_index>=vcd_cache_size)vcd_cache_index=0;
// read data!
vcd_set_msf(vcd_cache_current);
memcpy(vcd_buf,&vcd_entry.entry.addr.msf,sizeof(struct cdrom_msf));
/* if(ioctl(fd,CDROMREADRAW,vcd_buf)==-1) return 0; */ // EOF?
++vcd_cache_current;
memcpy(mem,&vcd_buf[VCD_SECTOR_OFFS],VCD_SECTOR_DATA);
return VCD_SECTOR_DATA;
}
#endif
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