helpers/__init__.py

   1 # -*- coding: utf-8 -*-
   2 import argparse
   3 import sys
   4 import os
   5 import math
   6 import sounddevice as sd
   7
   8 class Config:
   9     def __init__(self, **kwargs):
  10         for arg in kwargs:
  11             setattr(self, arg, kwargs[arg])
  12
  13 config = Config(yml_file="config.yml")
  14
  15 def path():
  16     if getattr(sys, 'frozen', False):
  17         return sys._MEIPASS + "/"
  18     else:
  19         path = os.path.dirname(os.path.realpath(__file__))
  20         return path + "/../"
  21
  22 def parse_args():
  23     argv = sys.argv[1:]
  24     sys.argv = sys.argv[:1]
  25     if "--" in argv:
  26         index = argv.index("--")
  27         kivy_args = argv[index+1:]
  28         argv = argv[:index]
  29
  30         sys.argv.extend(kivy_args)
  31
  32     parser = argparse.ArgumentParser(description="A Music Sampler application.")
  33     parser.add_argument("-c", "--config",
  34             default="config.yml",
  35             required=False,
  36             help="Config file to load")
  37     parser.add_argument("-V", "--version",
  38             action="version",
  39             help="Displays the current version and exits. Only use in bundled package",
  40             version=show_version())
  41     parser.add_argument("--device",
  42             action=SelectDeviceAction,
  43             help="Select this sound device"
  44             )
  45     parser.add_argument("--list-devices",
  46             nargs=0,
  47             action=ListDevicesAction,
  48             help="List available sound devices"
  49             )
  50     parser.add_argument('--',
  51             dest="args",
  52             help="Kivy arguments. All arguments after this are interpreted by Kivy. Pass \"-- --help\" to get Kivy's usage.")
  53     args = parser.parse_args(argv)
  54
  55     config.yml_file = args.config
  56
  57 class SelectDeviceAction(argparse.Action):
  58     def __call__(self, parser, namespace, values, option_string=None):
  59         sd.default.device = values
  60
  61 class ListDevicesAction(argparse.Action):
  62     nargs = 0
  63     def __call__(self, parser, namespace, values, option_string=None):
  64         print(sd.query_devices())
  65         sys.exit()
  66
  67 def show_version():
  68     if getattr(sys, 'frozen', False):
  69         with open(path() + ".pyinstaller_commit", "r") as f:
  70             return f.read()
  71     else:
  72         return "option '-v' can only be used in bundled package"
  73
  74 def yml_file():
  75     return config.yml_file
  76
  77 def duration_to_min_sec(duration):
  78     minutes = int(duration / 60)
  79     seconds = int(duration) % 60
  80     if minutes < 100:
  81         return "{:2}:{:0>2}".format(minutes, seconds)
  82     else:
  83         return "{}:{:0>2}".format(minutes, seconds)
  84
  85 def gain(volume, old_volume = None):
  86     if old_volume is None:
  87         return 20 * math.log10(volume / 100)
  88     else:
  89         return [20 * math.log10(max(volume, 0.1) / max(old_volume, 0.1)), max(volume, 0)]
  90