python版本网易云音乐ncm文件格式转换(mirror from https://github.com/nondanee/ncmdump)
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6 years ago
# -*- coding: utf-8 -*-
"""
Created on Sun Jul 15 01:05:58 2018
@author: Nzix
"""
import binascii
import struct
import base64
import json
import os
from Crypto.Cipher import AES
from mutagen import mp3, flac, id3
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def dump(file_path):
core_key = binascii.a2b_hex("687A4852416D736F356B496E62617857")
meta_key = binascii.a2b_hex("2331346C6A6B5F215C5D2630553C2728")
unpad = lambda s : s[0:-(s[-1] if type(s[-1]) == int else ord(s[-1]))]
f = open(file_path,'rb')
# magic header
header = f.read(8)
assert binascii.b2a_hex(header) == b'4354454e4644414d'
# key data
f.seek(2, 1)
key_length = f.read(4)
key_length = struct.unpack('<I', bytes(key_length))[0]
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key_data = bytearray(f.read(key_length))
key_data = bytes(bytearray([byte ^ 0x64 for byte in key_data]))
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cryptor = AES.new(core_key, AES.MODE_ECB)
key_data = unpad(cryptor.decrypt(key_data))[17:]
key_length = len(key_data)
# key box
key_data = bytearray(key_data)
key_box = bytearray(range(256))
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j = 0
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for i in range(256):
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j = (key_box[i] + j + key_data[i % key_length]) & 0xff
key_box[i], key_box[j] = key_box[j], key_box[i]
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# meta data
meta_length = f.read(4)
meta_length = struct.unpack('<I', bytes(meta_length))[0]
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meta_data = bytearray(f.read(meta_length))
meta_data = bytes(bytearray([byte ^ 0x63 for byte in meta_data]))
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meta_data = base64.b64decode(meta_data[22:])
cryptor = AES.new(meta_key, AES.MODE_ECB)
meta_data = unpad(cryptor.decrypt(meta_data)).decode('utf-8')[6:]
meta_data = json.loads(meta_data)
# crc32
crc32 = f.read(4)
crc32 = struct.unpack('<I', bytes(crc32))[0]
# album cover
f.seek(5, 1)
image_size = f.read(4)
image_size = struct.unpack('<I', bytes(image_size))[0]
image_data = f.read(image_size)
# media data
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file_name = meta_data['artist'][0][0] + ' - ' + meta_data['musicName'] + '.' + meta_data['format']
music_path = os.path.join(os.path.split(file_path)[0],file_name)
m = open(music_path,'wb')
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while True:
chunk = bytearray(f.read(0x8000))
chunk_length = len(chunk)
if not chunk:
break
for i in range(chunk_length):
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j = (i + 1) & 0xff
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chunk[i] ^= key_box[(key_box[j] + key_box[(key_box[j] + j) & 0xff]) & 0xff]
m.write(chunk)
m.close()
f.close()
# media tag
if meta_data['format'] == 'flac':
audio = flac.FLAC(music_path)
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# audio.delete()
image = flac.Picture()
image.type = 3
image.mime = 'image/jpeg'
image.data = image_data
audio.clear_pictures()
audio.add_picture(image)
elif meta_data['format'] == 'mp3':
audio = mp3.MP3(music_path)
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# audio.delete()
image = id3.APIC()
image.type = 3
image.mime = 'image/jpeg'
image.data = image_data
audio.tags.add(image)
audio.save()
audio = mp3.EasyMP3(music_path)
audio['title'] = meta_data['musicName']
audio['album'] = meta_data['album']
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audio['artist'] = '/'.join([artist[0] for artist in meta_data['artist']])
audio.save()
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if __name__ == '__main__':
import sys
if len(sys.argv) > 1:
files = sys.argv[1:]
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else:
files = [file_name for file_name in os.listdir('.') if os.path.splitext(file_name)[-1] == '.ncm']
if not files:
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print('please input file path!')
for file_name in files:
try:
dump(file_name)
print(os.path.split(file_name)[-1])
except Exception as e:
print(e)
pass