[pygame] CDROM Module to calc a freeDB DiscID ???

[genrich <Genrich@gmx.net>]

I try to generate the freeDB DiscID with the pygame CDROM Module...

Here the Code:

=======================================

from pygame import cdrom

cdrom.init()
print "CDROM initialized: ", cdrom.get_init()
print "Number of CDROMs:  ", cdrom.get_count()


def GetHMS(s):
    h,s = divmod(s,3600)
    m,s=divmod(s,60)
    return "%02.f:%02.f:%02.f" % (h, m, s)

def Sek_Frames(s):
    nurSek = int( s )
    Frames = int( round( (s - nurSek) * 75 ) )
    return nurSek, Frames


def cddb_sum(n):
    # cddb_sum(123456789) => 1+2+3+4+5+6+7+8+9 = 45
    ret = 0
    while n > 0:
        ret += (n % 10)
        n = n / 10
    return ret


def DiscID(cd_object):
    print "\n Nr.   Länge"
    print "--------------------------"

    checksum=0
    TotalFrames=0
    TotalSek=0
    for i in range(TrackAnzahl):
        track_length = cd_object.get_track_length(i)

        nurSek, Frames = Sek_Frames( track_length )
        checksum += cddb_sum(nurSek)

        print " %2d   %s.%2d Frames" % (i, GetHMS(nurSek), Frames)

        TotalSek += nurSek

    nurSek, Frames = Sek_Frames( TotalSek )
    print "\nTotalZeit:",nurSek,"sek"
    print "TotalZeit: %s.%d" % (GetHMS(nurSek),Frames)

    sek_LetzterTrack = Sek_Frames(cd_object.get_track_length(i))[0]
    sek_ErsterTrack  = Sek_Frames(cd_object.get_track_length(0))[0]

    t=sek_LetzterTrack - sek_ErsterTrack

    RAWdiscID=( checksum % 0xff << 24 | t << 8 | TrackAnzahl )



for i in range(cdrom.get_count()):
    cd_object = cdrom.CD(i)
    print "\nNr.:",i," Laufwerk:",cd_object.get_name()

    print "Initialisierte..."
    cd_object.init()

    TrackAnzahl = cd_object.get_numtracks()

    if TrackAnzahl!=0:
        RAWdiscID = DiscID(cd_object)
        print "\nRAW discID..:", RAWdiscID
        print "freedb ID...: %08lx" % RAWdiscID

=======================================



I have test it with "Depeche Mode" - "Speak & Spell":


 Nr.   Länge
--------------------------
  0   00:03:46. 0 Frames
  1   00:02:18.25 Frames
  2   00:03:57.63 Frames
  3   00:03:07.25 Frames
  4   00:04:15.57 Frames
  5   00:02:45.40 Frames
  6   00:04:44.28 Frames
  7   00:04:37.62 Frames
  8   00:04:24.45 Frames
  9   00:02:35. 5 Frames
 10   00:03:44.58 Frames
 11   00:04:03.65 Frames
 12   00:04:05.37 Frames
 13   00:03:46.63 Frames
 14   00:03:08.65 Frames
 15   00:06:44.12 Frames

TotalZeit: 3718 sek
TotalZeit: 01:01:58.0

RAW discID..: -1107250672
freedb ID...: be00b210


But be00b210 isn't the right ID :(



I search by hand and one of the follow IDs are the right:
d40e9010
db0e9210
d60e5910



Here the spec. from freedb:
http://freedb.org/modules.php?name=Sections&sop=viewarticle&artid=6




--
Genrich