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//=================== VideoCD ==========================
static struct cdrom_tocentry vcd_entry;
void vcd_set_msf(unsigned int sect){
vcd_entry.cdte_addr.msf.frame=sect%75;
sect=sect/75;
vcd_entry.cdte_addr.msf.second=sect%60;
sect=sect/60;
vcd_entry.cdte_addr.msf.minute=sect;
}
unsigned int vcd_get_msf(){
return vcd_entry.cdte_addr.msf.frame +
(vcd_entry.cdte_addr.msf.second+
vcd_entry.cdte_addr.msf.minute*60)*75;
}
int vcd_seek_to_track(int fd,int track){
vcd_entry.cdte_format = CDROM_MSF;
vcd_entry.cdte_track = track;
if (ioctl(fd, CDROMREADTOCENTRY, &vcd_entry)) {
perror("ioctl dif1");
return 0;
}
return 1;
}
void vcd_read_toc(int fd){
struct cdrom_tochdr tochdr;
int i;
if (ioctl(fd,CDROMREADTOCHDR,&tochdr)==-1)
{ perror("read CDROM toc header: "); return; }
for (i=tochdr.cdth_trk0 ; i<=tochdr.cdth_trk1 ; i++){
struct cdrom_tocentry tocentry;
tocentry.cdte_track = i;
tocentry.cdte_format = CDROM_MSF;
if (ioctl(fd,CDROMREADTOCENTRY,&tocentry)==-1)
{ perror("read CDROM toc entry: "); return; }
printf("track %02d: adr=%d ctrl=%d format=%d %02d:%02d:%02d mode: %d\n",
(int)tocentry.cdte_track,
(int)tocentry.cdte_adr,
(int)tocentry.cdte_ctrl,
(int)tocentry.cdte_format,
(int)tocentry.cdte_addr.msf.minute,
(int)tocentry.cdte_addr.msf.second,
(int)tocentry.cdte_addr.msf.frame,
(int)tocentry.cdte_datamode
);
}
}
#define VCD_SECTOR_SIZE 2352
#define VCD_SECTOR_OFFS 24
#define VCD_SECTOR_DATA 2324
static char vcd_buf[VCD_SECTOR_SIZE];
int vcd_read(int fd,char *mem){
memcpy(vcd_buf,&vcd_entry.cdte_addr.msf,sizeof(struct cdrom_msf));
if(ioctl(fd,CDROMREADRAW,vcd_buf)==-1) return 0; // EOF?
vcd_entry.cdte_addr.msf.frame++;
if (vcd_entry.cdte_addr.msf.frame==75){
vcd_entry.cdte_addr.msf.frame=0;
vcd_entry.cdte_addr.msf.second++;
if (vcd_entry.cdte_addr.msf.second==60){
vcd_entry.cdte_addr.msf.second=0;
vcd_entry.cdte_addr.msf.minute++;
}
}
memcpy(mem,&vcd_buf[VCD_SECTOR_OFFS],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));
}
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.cdte_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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