blobs.py

#!/usr/bin/env python

from __future__ import print_function
import json
import os
import subprocess

device = "msm8996-common"
vendor = "xiaomi"
system = "system/"

data = json.load(open("proprietary-files.json", "rb"))
for section in data:
    for blob in data[section]:
        target = blob
        if data[section][blob].get("target") is not None:
            target = data[section][blob].get("target")
        directory = os.path.dirname(system + target)
        if not os.path.exists(directory):
            os.makedirs(directory)
        subprocess.call(["adb", "pull", system + blob, system + target])

proprietary-files.json

{
  "ADSP": {
    "bin/adsprpcd": {
      "target": "vendor/bin/adsprpcd"
    },
    "vendor/lib64/libadsprpc.so": {}
  },
  "Widevine DRM": {
    "vendor/bin/hw/android.hardware.drm@1.0-service.widevine": {
      "sha1sum": "fd6e14710c196fdd4131afe2ce10c4a5be1b309c"
    }
  }
}