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                 percent = None
  28                 if self.type == self.BER: # as count
  29                         count = self.source.ber
  30                         if count is not None:
  31                                 return str(count)
  32                         else:
  33                                 return "N/A"
  34                 elif self.type == self.AGC:
  35                         percent = self.source.agc
  36                 elif self.type == self.SNR:
  37                         percent = self.source.snr
  38                 elif self.type == self.SNRdB:
  39                         if self.source.snr_db is not None:
  40                                 return "%3.02f dB" % (self.source.snr_db / 100.0)
  41                         elif self.source.snr is not None: #fallback to normal SNR...
  42                                 percent = self.source.snr
  43                 if percent is None:
  44                         return "N/A"
  45
  46                 return "%d %%" % (percent * 100 / 65536)
  47
  48         @cached
  49         def getBool(self):
  50                 assert self.type in [self.LOCK, self.BER], "the boolean output of FrontendInfo can only be used for lock or BER info"
  51                 if self.type == self.LOCK:
  52                         return self.source.lock
  53                 else:
  54                         return self.source.ber > 0
  55
  56         text = property(getText)
  57
  58         boolean = property(getBool)
  59
  60         @cached
  61         def getValue(self):
  62                 assert self.type != self.LOCK, "the value/range output of FrontendInfo can not be used for lock info"
  63                 if self.type == self.AGC:
  64                         return self.source.agc or 0
  65                 elif self.type == self.SNR:
  66                         return self.source.snr or 0
  67                 elif self.type == self.BER:
  68                         if self.BER < self.range:
  69                                 return self.BER or 0
  70                         else:
  71                                 return self.range
  72
  73         range = 65536
  74         value = property(getValue)