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