1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
#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 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 cdsector_t vcd_buf;
static int vcd_read(int fd,char *mem){
off_t offset = 0;
if (pread(fd,&vcd_buf,VCD_SECTOR_SIZE,vcd_get_msf()*VCD_SECTOR_SIZE)
!= VCD_SECTOR_SIZE) return 0; // EOF?
offset++;
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
|
