1 files changed, 122 insertions, 0 deletions
diff --git a/vcd_read.h b/vcd_read.h
new file mode 100644
index 0000000000..b772abf906
--- /dev/null
+++ b/vcd_read.h
@@ -0,0 +1,122 @@
+//=================== 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