ncm批量转mp3格式

鉴于某新版极度不友好，因此打算下载，搬到系统自带音乐播放器中使用

（1）在线转换，界面友好，低于50个文件可以自动转：

http://ncm.worthsee.com/

（2）github：

依赖pycrypto，最好在ubuntu系统下运行
pip(3) install pycrypto

代码：

import binascii
import struct
import base64
import json
import os
from Crypto.Cipher import AES 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') header = f.read(8) assert binascii.b2a_hex(header) == b'4354454e4644414d' f.seek(2, 1) key_length = f.read(4) key_length = struct.unpack('<I', bytes(key_length))[0] key_data = f.read(key_length) key_data_array = bytearray(key_data) for i in range (0,len(key_data_array)): key_data_array[i] ^= 0x64 key_data = bytes(key_data_array) cryptor = AES.new(core_key, AES.MODE_ECB) key_data = unpad(cryptor.decrypt(key_data))[17:] key_length = len(key_data) key_data = bytearray(key_data) key_box = bytearray(range(256)) c = 0 last_byte = 0 key_offset = 0 for i in range(256): swap = key_box[i] c = (swap + last_byte + key_data[key_offset]) & 0xff key_offset += 1 if key_offset >= key_length: key_offset = 0 key_box[i] = key_box[c] key_box[c] = swap last_byte = c meta_length = f.read(4) meta_length = struct.unpack('<I', bytes(meta_length))[0] meta_data = f.read(meta_length) meta_data_array = bytearray(meta_data) for i in range(0,len(meta_data_array)): meta_data_array[i] ^= 0x63 meta_data = bytes(meta_data_array) 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 = f.read(4) crc32 = struct.unpack('<I', bytes(crc32))[0] f.seek(5, 1) image_size = f.read(4) image_size = struct.unpack('<I', bytes(image_size))[0] image_data = f.read(image_size) file_name = meta_data['musicName'] + '.' + meta_data['format'] m = open(os.path.join(os.path.split(file_path)[0],file_name),'wb') chunk = bytearray() while True: chunk = bytearray(f.read(0x8000)) chunk_length = len(chunk) if not chunk: break for i in range(1,chunk_length+1): j = i & 0xff; chunk[i-1] ^= key_box[(key_box[j] + key_box[(key_box[j] + j) & 0xff]) & 0xff] m.write(chunk) m.close() f.close() def file_name(file_dir): for root, dirs, files in os.walk(file_dir): for file in files: if os.path.splitext(file)[1] == '.ncm': dump(file) print(file) if __name__ == '__main__': import sys # if len(sys.argv) > 1: # for file_path in sys.argv[1:]: # try: # dump(file_path) # except: # pass # else: # print("Usage: python ncmTransfer.py \"File Name\"") try: print(os.getcwd()) file_name(os.getcwd()) except: print('不成')

把.py文件直接放到包含ncm歌曲的目录中，执行脚本就会把该目录下所有ncm歌曲转换为mp3

Ref:

链接：https://www.jianshu.com/p/9bc9c1f4e53a

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