├── README.md
└── ncmTranslator.py


/README.md:
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 1 | # ncmTranslatorScript_python
 2 | 网易云音乐.ncm音乐格式转换python脚本
 3 | 
 4 | 使用方法：
 5 | 
 6 | 方法一：
 7 |   1、将 ncmTranslator.py 脚本放到需要处理的文件夹下    
 8 |      2、执行 ./ncmTranslator.py   
 9 | 方法二：
10 |   ./ncmTranslator.py {参数：指定要处理的绝对路径}  
11 |     
12 | ps：只在ubuntu下使用过, 使用的python3   
13 | ps2: 顺便会下载专辑图片到音乐文件所在的路径    
14 | 引用代码：https://github.com/lianglixin/ncmdump/blob/master/folder_dump.py    
15 |     
16 |     
17 | 后台使用：nohup ./ncmTranslator.py > ./process.log 2>&1 &    
18 | 后台使用的方法查看日志：tail -f process.log    
19 | 
20 | ## Star History
21 | 
22 | ## Stargazers over time
23 | [![Star History](https://starchart.cc/waterkokoro/ncmTranslatorScript_python.svg?variant=light)](https://starchart.cc/waterkokoro/ncmTranslatorScript_python)
24 | 
25 | 


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/ncmTranslator.py:
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  1 | #!/usr/bin/python3
  2 | # Modifier: Liang Lixin
  3 | # Folder dump version by LiangLixin
  4 | import binascii
  5 | import struct
  6 | import base64
  7 | import json
  8 | import os
  9 | import logging
 10 | import urllib 
 11 | import requests
 12 | import time
 13 | 
 14 | from Crypto.Cipher import AES
 15 | 
 16 | music_suffix_list = ['mp3', 'wav', 'ape', 'flac', 'MP3', 'WAV', 'APE', 'FLAC']
 17 | def dump(file_path, file_name_no_suffix):
 18 |     core_key = binascii.a2b_hex("687A4852416D736F356B496E62617857")
 19 |     meta_key = binascii.a2b_hex("2331346C6A6B5F215C5D2630553C2728")
 20 |     unpad = lambda s : s[0:-(s[-1] if type(s[-1]) == int else ord(s[-1]))]
 21 |     f = open(file_path,'rb')
 22 |     header = f.read(8)
 23 |     assert binascii.b2a_hex(header) == b'4354454e4644414d'
 24 |     f.seek(2, 1)
 25 |     key_length = f.read(4)
 26 |     key_length = struct.unpack('<I', bytes(key_length))[0]
 27 |     key_data = f.read(key_length)
 28 |     key_data_array = bytearray(key_data)
 29 |     for i in range (0,len(key_data_array)): key_data_array[i] ^= 0x64
 30 |     key_data = bytes(key_data_array)
 31 |     cryptor = AES.new(core_key, AES.MODE_ECB)
 32 |     key_data = unpad(cryptor.decrypt(key_data))[17:]
 33 |     key_length = len(key_data)
 34 |     key_data = bytearray(key_data)
 35 |     key_box = bytearray(range(256))
 36 |     c = 0
 37 |     last_byte = 0
 38 |     key_offset = 0
 39 |     for i in range(256):
 40 |         swap = key_box[i]
 41 |         c = (swap + last_byte + key_data[key_offset]) & 0xff
 42 |         key_offset += 1
 43 |         if key_offset >= key_length: key_offset = 0
 44 |         key_box[i] = key_box[c]
 45 |         key_box[c] = swap
 46 |         last_byte = c
 47 |     meta_length = f.read(4)
 48 |     meta_length = struct.unpack('<I', bytes(meta_length))[0]
 49 |     meta_data = f.read(meta_length)
 50 |     meta_data_array = bytearray(meta_data)
 51 |     for i in range(0,len(meta_data_array)): meta_data_array[i] ^= 0x63
 52 |     meta_data = bytes(meta_data_array)
 53 |     meta_data = base64.b64decode(meta_data[22:])
 54 |     cryptor = AES.new(meta_key, AES.MODE_ECB)
 55 |     meta_data = unpad(cryptor.decrypt(meta_data)).decode('utf-8')[6:]
 56 |     meta_data = json.loads(meta_data)
 57 |     crc32 = f.read(4)
 58 |     crc32 = struct.unpack('<I', bytes(crc32))[0]
 59 |     f.seek(5, 1)
 60 |     image_size = f.read(4)
 61 |     image_size = struct.unpack('<I', bytes(image_size))[0]
 62 |     image_data = f.read(image_size)
 63 |     file_name = file_name_no_suffix + '.' + meta_data['format']
 64 | 
 65 |     ## delete
 66 |     # try:
 67 |     #     os.remove(os.path.join(os.path.split(file_path)[0], meta_data['musicName'] + '.' + meta_data['format']))
 68 |     #     print('删除文件 :' + os.path.join(os.path.split(file_path)[0], meta_data['musicName'] + '.' + meta_data['format']))
 69 |     #     ## delete 
 70 |     # except Exception as e:
 71 |     #     print('删除失败', e)
 72 |     
 73 | 
 74 |     m = open(os.path.join(os.path.split(file_path)[0],file_name),'wb')
 75 |     chunk = bytearray()
 76 |     while True:
 77 |         chunk = bytearray(f.read(0x8000))
 78 |         chunk_length = len(chunk)
 79 |         if not chunk:
 80 |             break
 81 |         for i in range(1,chunk_length+1):
 82 |             j = i & 0xff;
 83 |             chunk[i-1] ^= key_box[(key_box[j] + key_box[(key_box[j] + j) & 0xff]) & 0xff]
 84 |         m.write(chunk)
 85 |     m.close()
 86 |     f.close()
 87 |     try:
 88 |         urllib.request.urlretrieve(meta_data['albumPic'], os.path.join(os.path.split(file_path)[0], file_name_no_suffix) + '.jpg');
 89 |     except Exception as e:
 90 |         print('下载专辑图片出错', e)
 91 | 
 92 | def file_extension(path):
 93 |     return os.path.splitext(path)[1]
 94 | 
 95 | def file_no_extension(path):
 96 |     return os.path.splitext(path)[0]
 97 | 
 98 | def file_exist(file_name, file_list, file_list_path):
 99 |     for file in file_list:
100 |         if (os.path.isdir(os.path.join(file_list_path, file))):
101 |             # print('######### 文件夹, 跳过')
102 |             continue
103 |         for suffix in music_suffix_list:
104 |             if (file_no_extension(file_name) + "." + suffix) == file:
105 |                 return True;
106 |     return False;
107 | 
108 | def recursion(file_name, root_dir, file_list):
109 |     # print('root_dir: ' + root_dir)
110 |     # print('file_name: ' + file_name)
111 |     full_file = os.path.join(root_dir, file_name)
112 |     if os.path.isfile(full_file):
113 |         print('>>>>>>>>>>>>>>>> 当前文件: ' + full_file)
114 |         if file_extension(full_file) == ".ncm":
115 |             # 校验文件存在同名
116 |             if file_exist(file_name, file_list, root_dir):
117 |                 print('>>>>>>>>>>>>>>> 同名文件跳过: ' + full_file)
118 |                 return
119 |             try:
120 |                 print('>>>>>>>>>>>>>>> 开始转码文件: ' + full_file)
121 |                 dump(full_file, file_no_extension(file_name));
122 |                 print('>>>>>>>>>>>>>>> 转码文件成功: ' + full_file)
123 |             except Exception as err:
124 |                 print('转码文件失败: ' + full_file + ' error: ' + err)
125 |         else:
126 |             print('>>>>>>>>>>>>>>> 非ncm文件, 跳过')
127 |     elif os.path.isdir(full_file):
128 |         print('>>>>>>>>>>>>>>> 处理当前文件夹内容: ' + full_file)
129 |         list = os.listdir(full_file)
130 |         for i in range(0, len(list)):
131 |             recursion(list[i], full_file, list)
132 | if __name__ == '__main__':
133 |     import sys
134 |     if len(sys.argv) > 1:
135 |         rootdir = sys.argv[1]; #如果有输入路径参数，取当前路径参数
136 |     else:
137 |         # 没写路径默认走当前文件夹
138 |         rootdir = os.path.split(os.path.realpath(__file__))[0];
139 |     print('>>>>>>>>>>>>>>> 初始路径层级: ' + rootdir)
140 |     list = os.listdir(rootdir) # Get all files in folder.is
141 |     for i in range(0,len(list)):
142 |         try:
143 |             recursion(list[i], rootdir, list)
144 |         except Exception as e:
145 |             print('递归处理出现错误');
146 |             logging.exception(e)
147 |         finally:
148 |             pass
149 | 
150 |     print('全部文件处理完成 ' + time.strftime("%Y-%m-%d %H:%M:%S", time.localtime()));
151 | 


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