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

秒客网

ncm批量转mp3格式

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