Someone

    ogg_sync_state *oy;

167         oy = ogg_sync_create();
(gdb) p *oy
$1 = {bufferpool = 0x8250f9c, fifo_head = 0x0, fifo_tail = 0x0, fifo_fill = 0, unsynced = 0, headerbytes = 0, 
  bodybytes = 0}
(gdb) p oy
$2 = (ogg_sync_state *) 0x8250f80
(gdb) n
179             buffer = (char *) ogg_sync_bufferin(oy, CHUNKSIZE);
(gdb) s
ogg_sync_bufferin (oy=0x8250f80, bytes=10000) at framing.c:605
605       if(!oy->fifo_head){
(gdb) p *oy
$3 = {bufferpool = 0x0, fifo_head = 0x0, fifo_tail = 0x0, fifo_fill = 0, unsynced = 0, headerbytes = 0, bodybytes = 0}