nrg.py

import sys, os, struct

nrgf = open(sys.argv[1], "rb")
nrgf.seek(-12, 2)

buf = nrgf.read(4)

if buf != "NRG5" :
    exit

print buf

chunk_off = struct.unpack("!q", nrgf.read(8))[0]

nrgf.seek(chunk_off)
ch_name = nrgf.read(4)

track = []
while ch_name != 'END!':
    print ch_name,
    ch_size = struct.unpack("!l", nrgf.read(4))[0]

    if ch_name == "ETN2":
        chunk = struct.unpack("!qqllll", nrgf.read(ch_size))
        print chunk
        track.append((chunk[0], chunk[1]))
    elif ch_name == "SINF":
        print struct.unpack("!l", nrgf.read(ch_size))
    elif ch_name == "MTYP":
        print struct.unpack("!l", nrgf.read(ch_size))
    else:
        print struct.unpack(string(ch_size)+"c", nrgf.read(ch_size))

    ch_name = nrgf.read(4)

for i,v in enumerate(track):
    print i, v
    trf = open("trk"+str(i),"wb")
    nrgf.seek(v[0])
    trf.write(nrgf.read(v[1]))
    trf.close()