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yulinling
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ncmTranslator.py
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162
ncmTranslator.py
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import base64
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import binascii
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import json
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import logging
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import os
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import struct
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import sys
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import time
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import urllib
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import urllib
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import requests
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from os import fspath
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from pathlib import Path
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from Crypto.Cipher import AES
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music_suffix_list = ['mp3', 'wav', 'ape', 'flac', 'MP3', 'WAV', 'APE', 'FLAC']
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# 进行ncm解码
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def dump(file_path, file_name_no_suffix):
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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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header = f.read(8)
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assert binascii.b2a_hex(header) == b'4354454e4644414d'
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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 = f.read(key_length)
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key_data_array = bytearray(key_data)
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for i in range(0, len(key_data_array)): key_data_array[i] ^= 0x64
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key_data = bytes(key_data_array)
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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_data = bytearray(key_data)
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key_box = bytearray(range(256))
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c = 0
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last_byte = 0
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key_offset = 0
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for i in range(256):
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swap = key_box[i]
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c = (swap + last_byte + key_data[key_offset]) & 0xff
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key_offset += 1
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if key_offset >= key_length: key_offset = 0
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key_box[i] = key_box[c]
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key_box[c] = swap
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last_byte = c
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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 = f.read(meta_length)
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meta_data_array = bytearray(meta_data)
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for i in range(0, len(meta_data_array)): meta_data_array[i] ^= 0x63
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meta_data = bytes(meta_data_array)
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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 = f.read(4)
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crc32 = struct.unpack('<I', bytes(crc32))[0]
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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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file_name = file_name_no_suffix + '.' + meta_data['format']
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## delete
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# try:
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# os.remove(os.path.join(os.path.split(file_path)[0], meta_data['musicName'] + '.' + meta_data['format']))
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# print('删除文件 :' + os.path.join(os.path.split(file_path)[0], meta_data['musicName'] + '.' + meta_data['format']))
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# ## delete
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# except Exception as e:
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# print('删除失败', e)
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m = open(os.path.join(os.path.split(file_path)[0], file_name), 'wb')
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chunk = bytearray()
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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(1, chunk_length + 1):
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j = i & 0xff
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chunk[i - 1] ^= 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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try:
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urllib.request.urlretrieve(meta_data['albumPic'],
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os.path.join(os.path.split(file_path)[0], file_name_no_suffix) + '.jpg')
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except Exception as e:
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print('下载专辑图片出错', e)
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def file_extension(path):
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return os.path.splitext(path)[1]
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def file_no_extension(path):
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return os.path.splitext(path)[0]
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def file_exist(file_name, file_list, file_list_path):
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for file in file_list:
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if os.path.isdir(os.path.join(file_list_path, file)):
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# print('######### 文件夹, 跳过')
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continue
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for suffix in music_suffix_list:
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if (file_no_extension(file_name) + "." + suffix) == file:
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return True
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return False
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def recursion(file_name, root_dir, file_list):
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full_file = os.path.join(root_dir, file_name)
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if os.path.isfile(full_file):
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if file_extension(full_file) != ".ncm":
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print(full_file + '>>>>>>>>>>>>>>> 非ncm文件, 跳过')
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return
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if file_exist(file_name, file_list, root_dir):
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print(full_file + '>>>>>>>>>>>>>>> 同名文件跳过')
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return
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try:
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print(full_file + '>>>>>>>>>>>>>>> 开始转码文件')
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dump(full_file, file_no_extension(file_name))
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print(full_file + '>>>>>>>>>>>>>>> 转码文件成功' )
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except Exception as err:
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print('转码文件失败: ' + full_file + ' error: ' + err)
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elif os.path.isdir(full_file):
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print('>>>>>>>>>>>>>>> 处理当前文件夹内容: ' + full_file)
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list = os.listdir(full_file)
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for i in range(0, len(list)):
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recursion(list[i], full_file, list)
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if __name__ == '__main__':
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if len(sys.argv) > 1:
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# 根据命令的文件夹进行处理
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rootdir = sys.argv[1]
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else:
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# 根据当前所在文件夹进行处理
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rootdir = fspath(Path(__file__).parent.resolve())
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print('当前需要处理的文件夹路径: ' + rootdir)
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start_time = time.time()
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print('开始处理中' + time.strftime("%Y-%m-%d %H:%M:%S", time.localtime()))
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# 获取rootdir的所有文件名称
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file_list = os.listdir(rootdir)
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for i in range(0, len(file_list)):
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try:
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recursion(file_list[i], rootdir, file_list)
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except Exception as e:
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print('递归处理出现错误')
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logging.exception(e)
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end_time = time.time()
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print('全部文件处理完成 ' + time.strftime("%Y-%m-%d %H:%M:%S", time.localtime()))
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print('处理时间:', end_time - start_time)
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