#!/usr/bin/python
import fcntl, struct, os, string

def get_toc(dev):
    CDROMREADTOCHDR=0x5305
    CDROMREADTOCENTRY=0x5306
    CDROM_MSF=0x02

    ioctlarg=' '*1024
    val = fcntl.ioctl(dev,CDROMREADTOCHDR,ioctlarg)
    hdr = struct.unpack('BB',val[:2])
    tracks = []
    for i in range(hdr[0],hdr[1]+1):
	tracks.append(i)
    tracks.append(0xAA)
    toc = []
    for track in tracks:
	ioctlarg = struct.pack('BBBBBBBBiB',track, 0, CDROM_MSF,0,0,0,0,0,0,0)
	val = fcntl.ioctl(dev,CDROMREADTOCENTRY,ioctlarg)
	tocentry = struct.unpack('BBBBBBBBiB', val)
	msf = {
	    'track' : tocentry[0],
	    'minute' : tocentry[4],
	    'second' : tocentry[5],# -2, #  -2 to kludge for between-track gap
	    'frame' : tocentry[6]
	}
	toc.append(msf)
    return toc

def cddb_sum(n):
    ret = 0
    while n > 0:
	ret = ret + (n % 10)
	n = n / 10
    return ret

def seconds(msf):
    ret = (msf['minute']*60) + msf['second']
    return ret

def frames(msf):
    return (msf['minute']*60*75) + \
	(msf['second']*75) + \
	(msf['frame'])

def get_discinfo(toc):
    csum = 0
    t = 0
    length = 0
    trackinfo = []
    for entry in toc:
	if entry['track'] == 0xAA:
	    t = seconds(entry) - seconds(toc[0])
	    length = seconds(entry)
	else:
	    trackinfo.append(frames(entry))
	    csum = csum + cddb_sum(seconds(entry))
    discid = ((csum % 0xFF) << 24 | t << 8 | len(toc)-1)
    discinfo = {
	'discid' : discid,
	'tracks' : len(toc)-1,
	'trackinfo' : trackinfo,
	'length' : length,
    }
    return discinfo

fd = os.open('/dev/scd0',os.O_RDONLY|os.O_NONBLOCK)
toc = get_toc(fd)
discinfo = get_discinfo(toc)
tracklist = string.join(map(lambda a: "%d" % a, discinfo['trackinfo']),' ')
track_info = "%(discid)08x %(tracks)d " % discinfo + \
	    tracklist + \
	    " %(length)s" % discinfo
print track_info