lib/python/Components/Converter/FrontendInfo.py

   1 from Components.Converter.Converter import Converter
   2 from Components.Element import cached
   3
   4 class FrontendInfo(Converter, object):
   5         BER = 0
   6         SNR = 1
   7         AGC = 2
   8         LOCK = 3
   9         SNRdB = 4
  10
  11         def __init__(self, type):
  12                 Converter.__init__(self, type)
  13                 if type == "BER":
  14                         self.type = self.BER
  15                 elif type == "SNR":
  16                         self.type = self.SNR
  17                 elif type == "SNRdB":
  18                         self.type = self.SNRdB
  19                 elif type == "AGC":
  20                         self.type = self.AGC
  21                 else:
  22                         self.type = self.LOCK
  23
  24         @cached
  25         def getText(self):
  26                 assert self.type != self.LOCK, "the text output of FrontendInfo cannot be used for lock info"
  27                 if self.type == self.BER: # as count
  28                         count = self.source.ber
  29                         if count is not None:
  30                                 return str(count)
  31                         else:
  32                                 return "N/A"
  33                 elif self.type == self.AGC:
  34                         percent = self.source.agc
  35                 elif self.type == self.SNR:
  36                         percent = self.source.snr
  37                 elif self.type == self.SNRdB:
  38                         if self.source.snr_db is None:
  39                                 return "N/A"
  40                         return "%3.02f dB" % (self.source.snr_db / 100.0)
  41                 if percent is None:
  42                         return "N/A"
  43
  44                 return "%d %%" % (percent * 100 / 65536)
  45
  46         @cached
  47         def getBool(self):
  48                 assert self.type in [self.LOCK, self.BER], "the boolean output of FrontendInfo can only be used for lock or BER info"
  49                 if self.type == self.LOCK:
  50                         return self.source.lock
  51                 else:
  52                         return self.source.ber > 0
  53
  54         text = property(getText)
  55
  56         boolean = property(getBool)
  57
  58         @cached
  59         def getValue(self):
  60                 assert self.type != self.LOCK, "the value/range output of FrontendInfo can not be used for lock info"
  61                 if self.type == self.AGC:
  62                         return self.source.agc or 0
  63                 elif self.type == self.SNR:
  64                         return self.source.snr or 0
  65                 elif self.type == self.BER:
  66                         if self.BER < self.range:
  67                                 return self.BER or 0
  68                         else:
  69                                 return self.range
  70
  71         range = 65536
  72         value = property(getValue)