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